JP7530595B2 - Transplanter - Google Patents

Description

The present invention relates to a transplanter for planting seedlings in a field.

A transplanter disclosed in Patent Document 1 below is known.
The transplanter disclosed in Patent Document 1 is equipped with a lifting mechanism that varies the height of the body relative to the wheels so as to maintain a constant height of the body from the ground, and a swinging mechanism that swings the body around a longitudinal axis so as to reduce the difference in height between the left and right sides of the body from the ground.

Japanese Patent Application Publication No. 10-28420

In the transplanter described above, the lifting mechanism and the rocking mechanism are provided as independent mechanisms, which makes it difficult to change the height (overall height) and posture (height difference between the left and right sides) of the machine body to the optimal state in response to changes in the height of the planting surface.
The present invention has been made in consideration of the above problems, and provides a transplanter that can change the height and posture of its body to optimal states in response to changes in the height of the planting surface.

The technical means adopted by the present invention to solve the above problems are characterized as follows.
A transplanter according to one aspect of the present invention comprises a machine body, wheels supporting the machine body so that it can run, a transplanting unit provided on the machine body for planting seedlings in a field, ground contact wheels provided on the machine body that move up and down in accordance with the undulations of the planting surface of the field, a lifting mechanism that varies the height of the machine body relative to the wheels so as to maintain a constant height of the machine body from the planting surface, and a machine body control mechanism including a swinging mechanism that swings the machine body about an axis in the forward and backward directions so as to reduce a difference in height between the left and right parts of the machine body from the planting surface, the ground contact wheels including a first ground contact wheel provided on the left part of the machine body and a second ground contact wheel provided on the right part of the machine body, and the machine body control mechanism is configured to determine a control value for determining a control value for a control value of the control value based on an amount of change in height of the first ground contact wheel. Based on a certain first fluctuation amount and a second fluctuation amount which is a fluctuation amount of the height of the second ground contact wheel, switching is performed between an interlocking state in which both the lifting mechanism and the oscillating mechanism are operating and a non-interlocking state in which either the lifting mechanism or the oscillating mechanism is operating, and the non-interlocking state includes a first non-interlocking state in which only the lifting mechanism is operating and a second non-interlocking state in which only the oscillating mechanism is operating, and the aircraft control mechanism is a mechanism that switches between the first non-interlocking state and the second non-interlocking state based on the first fluctuation amount and the second fluctuation amount, and switches to the first non-interlocking state when there is no difference between the first fluctuation amount and the second fluctuation amount and the average value of the first fluctuation amount and the second fluctuation amount is equal to or greater than a predetermined amount .

A transplanter according to one aspect of the present invention comprises a machine body, wheels supporting the machine body so that it can run, a transplanting unit provided on the machine body for planting seedlings in a field, ground contact wheels provided on the machine body that move up and down in accordance with the undulations of the planting surface of the field, a lifting mechanism that varies the height of the machine body relative to the wheels so as to maintain a constant height of the machine body from the planting surface, and a machine body control mechanism including a swinging mechanism that swings the machine body about an axis in the forward and backward directions so as to reduce a difference in height between the left and right parts of the machine body from the planting surface, the ground contact wheels including a first ground contact wheel provided on the left part of the machine body and a second ground contact wheel provided on the right part of the machine body, and the machine body control mechanism is configured to determine a control value for determining a control value for a control value of the control value based on an amount of change in height of the first ground contact wheel. Based on a certain first fluctuation amount and a second fluctuation amount which is a fluctuation amount of the height of the second ground contact wheel, switching is performed between an interlocking state in which both the lifting mechanism and the oscillating mechanism are operating and a non-interlocking state in which either the lifting mechanism or the oscillating mechanism is operating, and the non-interlocking state includes a first non-interlocking state in which only the lifting mechanism is operating and a second non-interlocking state in which only the oscillating mechanism is operating, and the aircraft control mechanism is a mechanism that switches between the first non-interlocking state and the second non-interlocking state based on the first fluctuation amount and the second fluctuation amount, and switches to the second non-interlocking state when there is a difference between the first fluctuation amount and the second fluctuation amount and the average value of the first fluctuation amount and the second fluctuation amount is less than a predetermined amount .

A transplanter according to one aspect of the present invention comprises a machine body, wheels supporting the machine body so that it can run, a transplanting unit provided on the machine body for planting seedlings in a field, ground contact wheels provided on the machine body that move up and down in accordance with the undulations of the planting surface of the field, a lifting mechanism that varies the height of the machine body relative to the wheels so as to maintain a constant height of the machine body from the planting surface, and a machine body control mechanism including a swinging mechanism that swings the machine body about an axis in the forward and backward directions so as to reduce a difference in height between the left and right parts of the machine body from the planting surface, the ground contact wheels including a first ground contact wheel provided on the left part of the machine body and a second ground contact wheel provided on the right part of the machine body, and the machine body control mechanism is configured to control the fluctuation of the height of the first ground contact wheel. a first fluctuation amount which is the amount of fluctuation of the height of the second ground contact wheel and a second fluctuation amount which is the amount of fluctuation of the height of the second ground contact wheel, the non-interlocking state including a first non-interlocking state in which only the lifting mechanism operates and a second non-interlocking state in which only the swing mechanism operates, the aircraft control mechanism being a mechanism which switches between the first non-interlocking state and the second non-interlocking state based on the first fluctuation amount and the second fluctuation amount, and which switches to the interlocking state when there is a difference between the first fluctuation amount and the second fluctuation amount and an average value of the first fluctuation amount and the second fluctuation amount is equal to or greater than a predetermined amount.

A transplanter according to one aspect of the present invention comprises a machine body, wheels supporting the machine body so that it can run, a transplanting unit provided on the machine body for planting seedlings in a field, ground contact wheels provided on the machine body that move up and down following the undulations of the planting surface of the field, a lifting mechanism that varies the height of the machine body relative to the wheels so as to maintain a constant height of the machine body from the planting surface, and a machine body control mechanism including a swinging mechanism that swings the machine body about an axis in the forward and backward directions so as to reduce a difference in height between a left part and a right part of the machine body from the planting surface, the ground contact wheels including a first ground contact wheel provided on the left part of the machine body and a second ground contact wheel provided on the right part of the machine body, and the machine body control mechanism controls a first fluctuation amount which is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount which is a fluctuation amount of the height of the second ground contact wheel.
Based on the two fluctuation amounts, a linked state in which both the lifting mechanism and the swing mechanism are operated and a non-linked state in which either the lifting mechanism or the swing mechanism is operated are switched, and the swing mechanism includes a swing cylinder that swings the machine body around an axis in the front-rear direction by telescopic drive, a fulcrum shaft extending in the up-down direction,
a first moving member disposed on the left side of the fulcrum shaft and moving in the front-rear direction based on the first fluctuation amount; a second moving member disposed on the right side of the fulcrum shaft and moving in the front-rear direction based on the second fluctuation amount; a connecting member extending in the left-right direction to connect the first moving member and the second moving member and swinging around the fulcrum shaft based on a difference between a first movement amount which is the movement amount of the first moving member and a second movement amount which is the movement amount of the second moving member; and a swing cylinder drive mechanism which connects the connecting member and the swing cylinder so as to be interlocked with each other and drives the swing cylinder when the difference between the first movement amount and the second movement amount becomes a predetermined amount or more. The swing cylinder drive mechanism includes a lever which can swing in a first direction to extend the swing cylinder and a second direction to shorten the swing cylinder, a horizontal shaft which extends in the left-right direction, and a lever which is connected to a left portion of the connecting member and drives the swing cylinder when the difference between the first movement amount and the second movement amount becomes a predetermined amount or more. the lever is rotated in the first direction when the movement amount of the first wire is greater than the movement amount of the second wire, the lever is rotated in the second direction when the movement amount of the second wire is greater than the movement amount of the first wire, and the lever is not rotated in the second direction when the movement amount of the first wire is greater than the movement amount of the second wire, and the lever is not rotated in the second direction when the movement amount of the first wire is greater than the movement amount of the second wire.

A transplanter according to one aspect of the present invention comprises a machine body, wheels supporting the machine body so that it can run, a transplanting unit provided on the machine body for planting seedlings in a field, ground contact wheels provided on the machine body that move up and down following the undulations of the planting surface of the field, a lifting mechanism that varies the height of the machine body relative to the wheels so as to maintain a constant height of the machine body from the planting surface, and a swinging mechanism that swings the machine body about a longitudinal axis so as to reduce a difference in height between the left and right sides of the machine body from the planting surface. The ground contact wheels include a first ground contact wheel provided on a left portion of the vehicle body and a second ground contact wheel provided on a right portion of the vehicle body, and the vehicle control mechanism switches between an interlocking state in which both the lifting mechanism and the swinging mechanism are operated and a non-interlocking state in which either the lifting mechanism or the swinging mechanism is operated based on a first fluctuation amount that is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount that is a fluctuation amount of the height of the second ground contact wheel, and the swinging mechanism includes a swing cylinder that swings the vehicle body around an axis in the front-rear direction by an extension and retraction drive, and a fulcrum shaft extending downward, a first moving member disposed on the left side of the fulcrum shaft and moving in the front-rear direction based on the first amount of fluctuation, a second moving member disposed on the right side of the fulcrum shaft and moving in the front-rear direction based on the second amount of fluctuation, a connecting member extending in the left-right direction to connect the first moving member and the second moving member and to swing around the fulcrum shaft based on the difference between a first amount of movement which is the amount of movement of the first moving member and a second amount of movement which is the amount of movement of the second moving member, and a connecting member which connects the connecting member and the swing cylinder so as to be interlocked with each other. and a swing cylinder drive mechanism that drives the swing cylinder when a difference between the first movement amount and the second movement amount becomes equal to or greater than a predetermined amount, and the lifting mechanism includes a lifting cylinder that varies the height of the machine body by telescopic drive, the fulcrum shaft, the first moving member, the second moving member, the connecting member, a lifting cylinder drive mechanism that connects the connecting member and the lifting cylinder so that they can be interlocked, and a horizontal shaft extending in the left-right direction, and the fulcrum shaft is adjusted based on an average value of the first movement amount and the second movement amount.
The lifting cylinder is tilted around the horizontal axis as a fulcrum based on the first movement amount, and the lifting cylinder drive mechanism is a mechanism that drives the lifting cylinder when the tilt amount of the fulcrum axis reaches or exceeds a certain value, and includes a rotating body that can rotate in a first direction to extend the lifting cylinder and a second direction to shorten the lifting cylinder, a first rotating member connected to a left part of the connecting member and rotating about the horizontal axis based on the first movement amount, a second rotating member connected to a right part of the connecting member and rotating about the horizontal axis based on the second movement amount, and a second interlocking mechanism that rotates the rotating body in conjunction with the rotation of the first rotating member and the second rotating member, and the second interlocking mechanism rotates the rotating body based on an average value of the rotation amount of the first rotating member and the rotation amount of the second rotating member.

A transplanter according to one aspect of the present invention includes a body, wheels that support the body so that it can travel, a transplanting unit that is provided on the body and plants seedlings in a field, a ground contact wheel that is provided on the body and moves up and down to follow the undulations of the planting surface of the field, a lifting mechanism that varies the height of the body relative to the wheels so as to maintain a constant height of the body from the planting surface, and a swinging mechanism that swings the body around a longitudinal axis so as to reduce a difference in height between the left and right parts of the body from the planting surface. and a setting lever for setting a reference height of the ground contact wheels, the ground contact wheels including a first ground contact wheel provided on a left portion of the body and a second ground contact wheel provided on a right portion of the body, the ground contact wheels being configured to be in an interlocking state in which both the lifting mechanism and the swinging mechanism are operated and in a non-interlocking state in which either the lifting mechanism or the swinging mechanism is operated based on a first fluctuation amount that is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount that is a fluctuation amount of the height of the second ground contact wheel. the swing mechanism includes a swing cylinder that swings the body around a longitudinal axis by extension and contraction drive, a fulcrum axis extending in the vertical direction, a first moving member arranged on the left side of the fulcrum axis and moving in the longitudinal direction based on the first fluctuation amount, a second moving member arranged on the right side of the fulcrum axis and moving in the longitudinal direction based on the second fluctuation amount, a connecting member extending in the horizontal direction and connecting the first moving member and the second moving member, and swinging around the fulcrum axis based on the difference between a first movement amount which is the movement amount of the first moving member and a second movement amount which is the movement amount of the second moving member, and a swing cylinder drive mechanism that connects the connecting member and the swing cylinder so that they can be interlocked, and drives the swing cylinder when the difference between the first movement amount and the second movement amount becomes equal to or greater than a predetermined amount, and the setting lever is capable of changing the reference height by swinging, and the first moving member and the second moving member move the same distance when the setting lever is swung.

Preferably , a switching mechanism is provided for switching between a manual mode in which the lever is manually swung and an automatic mode in which the lever is automatically swung, and the switching mechanism allows the lever to be swung by the first interlocking mechanism in the automatic mode and does not allow the lever to be swung by the first interlocking mechanism in the manual mode.

Preferably, the vehicle comprises a fixed shaft fixed to the aircraft and extending in the aircraft width direction, and a movable shaft capable of swinging relative to the fixed shaft and extending in the aircraft width direction, the movable shaft including a first movable shaft connected to be interlocked with the first ground contact wheel, and a second movable shaft connected to be interlocked with the second ground contact wheel, the first movable member moving in conjunction with the swinging of the first movable shaft, and the second movable member moving in conjunction with the swinging of the second movable shaft.

According to the present invention, based on the first fluctuation amount, which is the amount of fluctuation in the height of the first ground wheel, and the second fluctuation amount, which is the amount of fluctuation in the height of the second ground wheel, it is possible to switch between an interlocking state in which both the lifting mechanism and the rocking mechanism are operating, and an uninterlocking state in which either the lifting mechanism or the rocking mechanism is operating, so it is possible to change the height and attitude of the machine to an optimal state according to changes in the height of the planting surface. This makes it possible to keep the planting depth of seedlings constant even if the planting surface is undulating.

FIG. 2 is a plan view of the transplanter. FIG. 2 is a side view of the transplanter. FIG. FIG. 4 is a plan view showing the cup transfer mechanism of the seedling supply section, etc. FIG. FIG. 4 is a front view of a portion of the seedling supply section. 1 is a plan view showing the bottom cover of the seedling supplying cup and the holder that holds the upper part of the relay hopper. FIG. 1 is an oblique view showing the first planting device, the second planting device, the first crushing wheel, the second crushing wheel, etc. A front view showing the first planting device, the second planting device, the first crushing wheel, the second crushing wheel, etc. FIG. 2 is a plan view showing the first planting device, the second planting device, etc. FIG. 1A is a side view showing the positional relationship between the relay hopper and the lifting member (seedling guide, planting tool), in which (a) shows the lifting member in a lowered position, and (b) shows the lifting member in a raised position. FIG. A front view showing the positional relationship between the relay hopper and the lifting members (seedling guide, planting tool). FIG. 4 is a development view of a sheet constituting the relay hopper. FIG. 4 is a perspective view showing a holder that holds an upper portion of the relay hopper. 2 is a perspective view showing the ground contact wheel (pressure wheel), the first linkage mechanism, the second linkage mechanism, etc. FIG. 2 is a plan view showing the machine frame, the lifting cylinder, the swing cylinder, etc. FIG. 2 is a left side view showing the machine frame, the lifting cylinder, the swing cylinder, etc. FIG. 4 is a right side view showing the machine frame, the lifting cylinder, the swing cylinder, etc. FIG. 2 is a perspective view showing a main part of the aircraft control mechanism. FIG. 2 is an enlarged perspective view showing a main part of the aircraft control mechanism. FIG. 2 is a plan view showing a main part of the aircraft control mechanism. 13 is a side view showing the positions of the first moving member, the second moving member, the setting lever, etc. when the first grounding wheel and the second grounding wheel are in a high position. FIG. 10 is a side view showing the positions of the first moving member, the second moving member, the setting lever, etc. when the first ground contact wheel and the second ground contact wheel are in an intermediate position. FIG. 13 is a side view showing the positions of the first moving member, the second moving member, the setting lever, etc. when the first grounding wheel and the second grounding wheel are in a low position. FIG. 13 is a plan view illustrating the movement of the connecting member and the fulcrum shaft when the first movement amount is greater than the second movement amount. FIG. FIG. 13 is a side view showing the movement of the fulcrum shaft tilting forward. 11 is a plan view illustrating the relationship between a first movement amount, a second movement amount, and a tilt amount of a fulcrum shaft. FIG. 13 is a plan view illustrating the movement of the connecting member and the fulcrum shaft when the second movement amount is larger than the first movement amount. FIG. 13 is a plan view illustrating the movement of the connecting member and the fulcrum shaft when the first movement amount and the second movement amount are equal. FIG. 13 is a plan view illustrating the movement of the connecting member and the fulcrum shaft when the first moving member and the second moving member move rearward by the same amount. FIG. FIG. 13 is a side view showing the movement of the fulcrum shaft tilting rearward. 13 is a plan view illustrating the movement of the connecting member and the fulcrum shaft when the first moving member and the second moving member move the same amount in opposite directions. FIG. 13 is a plan view illustrating the movement of the connecting member and the fulcrum shaft when the first moving member and the second moving member move in opposite directions by different amounts. FIG. FIG. 4 is a side view of the first interlocking mechanism. FIG. 2 is a plan view showing the front of the transplanter. FIG. FIG. FIG. 4 is a perspective view of the first interlocking mechanism as viewed from the left front. FIG. 4 is a perspective view of the first interlocking mechanism as viewed from the right rear. 13A to 13C are diagrams illustrating the operation of the first interlocking mechanism when the first wire moves. 13A to 13C are diagrams illustrating the operation of the first interlocking mechanism when the second wire moves. 13A to 13C are diagrams illustrating the operation of the first interlocking mechanism when the first wire and the second wire move by the same amount. FIG. 4 is a perspective view showing a setting lever, a cover member, etc. FIG. 1 is a perspective view of a part of a transplanter equipped with a wheelbase adjustment mechanism, showing the wheelbase in a shortened state. FIG. 1 is a perspective view of a part of a transplanter equipped with a wheelbase adjustment mechanism, showing the wheelbase in a lengthened state. FIG. 4 is a cross-sectional view showing the first adjustment mechanism in a state where the wheelbase is shortened. FIG. 4 is a cross-sectional view showing the first adjustment mechanism in a state in which the wheel base is extended. FIG. 11 is a cross-sectional view showing the second adjustment mechanism in a state where the wheelbase is shortened. FIG. 4 is a perspective view showing a cylindrical body and one shaft. FIG. 11 is a cross-sectional view showing the second adjustment mechanism in a state in which the wheelbase is increased; 13 is a perspective view showing a second retaining portion, a cylindrical body, and a shaft body. FIG. 4 is a perspective view showing a first retaining portion, a cylindrical body, and a second inner cylinder. FIG. FIG. 4 is a perspective view of a first retaining member. 13 is a perspective view of the first retaining member as viewed from a different direction. FIG. This figure shows how, in a non-retained state, the phase around the central axis of the polygon on the inner surface of the hole in the second portion coincides with the phase around the central axis of the polygon on the inner surface of the cylindrical body and the phase around the central axis of the polygon of the insertion portion. This figure shows how, in a locked state, the phase around the central axis of the polygon on the inner surface of the hole in the second portion is misaligned with the phase around the central axis of the polygon on the inner surface of the cylindrical body and the phase around the central axis of the polygon of the insertion portion. This is a plan view illustrating four-row reciprocating planting work, showing the transplanter traveling in one direction along the ridges. This is a plan view illustrating four-row reciprocating planting work, showing the transplanter traveling in the other direction along the ridges. FIG. 2 is a perspective view showing a spare seedling tray, a support, and a pressing tool. 13 is an oblique view showing the spare seedling placing table in a second position. FIG. 11 is a rear view showing a state in which the seedling tray placed on the spare seedling placing table is not being held down by the holding device. FIG. 13 is a rear view showing a state in which the seedling tray placed on the spare seedling placing table is being pressed down by a pressing tool. FIG. 13 is a rear view showing a state in which the uppermost seedling placing tray is being pressed down by a pressing device when multiple spare seedling placing trays are in the second position. FIG. A rear view showing a state in which a plurality of spare seedling placing trays are in a second position and the topmost seedling placing tray is not being pressed down by the pressing device. 1 is a perspective view showing a front stand, a first holding portion, a second holding portion, boarding and alighting steps, etc. FIG. 1 is a plan view showing the front stand, the first holding portion, the second holding portion, the boarding and alighting steps, etc. FIG. 13 is a rear view showing the front stand in the upper position. FIG. 13 is a rear view showing the front stand in the lowered position. FIG. 4 is a perspective view showing a second holding portion and the like. FIG. 2 is a perspective view showing the body frame, the rear stand, and the push-down auxiliary tool. FIG. 2 is a plan view showing the body frame, the rear stand, and the push-down auxiliary tool. FIG. 13 is a side view showing the position of the push-down aid when the rear stand is in the raised position. FIG. 2 is a partial cross-sectional side view showing a first horizontal shaft, a second horizontal shaft, a tension spring, etc. FIG. 13 is a side view showing the position of the push-down aid when the rear stand is in the lowered position.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Figures 1 to 4 show the overall configuration of the transplanter 1. Figure 1 is a plan view of the transplanter 1, Figure 2 is a side view of the transplanter 1, Figure 3 is a rear view of the transplanter 1, and Figure 4 is a perspective view of the transplanter 1.
The transplanter 1 plants vegetable seedlings in the field (ridges) while traveling in the field.
In an embodiment of the present invention, the direction of travel of the transplanter 1 when planting seedlings (the direction of arrow F in Figures 1 and 2) will be described as the front, the opposite side of the direction of travel (the direction of arrow B in Figures 1 and 2) as the rear, the left side of the direction of travel (the direction of arrow L in Figures 1 and 3) as the left side, and the right side of the direction of travel (the direction of arrow R in Figures 1 and 3) as the right side.

The horizontal direction K2, which is perpendicular to the front-rear direction K1 shown in FIG. 1, is described as the width direction (or left-right direction) of the machine. The direction from the center of the width of the transplanter 1 (machine body 2) to the right or left is described as the outside of the machine. In other words, the outside of the machine is the direction in the machine width direction K2 that moves away from the center of the width of the transplanter 1 (machine body 2). The direction opposite to the outside of the machine is described as the inside of the machine. In other words, the inside of the machine is the direction in the machine width direction K2 that moves closer to the center of the width of the machine 2.

First, the overall configuration of the transplanter 1 will be described.
As shown in Figures 1 to 4, the transplanter 1 has a body 2. The body 2 is composed of a body frame 13 (see Figure 71, etc.) made up of a combination of metal pipes and the like. A prime mover (engine) 17 is mounted on the rear of the body 2. The body 2 has a transmission case M1 that houses a power transmission mechanism that transmits power from the prime mover 17. A steering handle 5 is provided on the rear of the body 2, which is held by an operator when operating the transplanter 1 while walking.

The transplanter 1 is equipped with a running device that supports the body 2 so that it can run. The running device includes a front wheel 3L and a rear wheel 4L arranged on the left side of the body 2, and a front wheel 3R and a rear wheel 4R arranged on the right side of the body 2. The front wheels 3L, 3R are driven wheels that rotate as the body 2 runs. The rear wheels 4L, 4R are drive wheels that rotate by receiving power from the prime mover 17. The power from the prime mover 17 is transmitted to the rear wheels 4L, 4R via the transmission case M1. During transplanting work, the wheels (front wheels 3L, 3R, rear wheels 4L, 4R) rotate while touching the ground between adjacent furrows (between furrows).

The machine body 2 is provided with a front wheel support arm 6 that supports the front wheels 3L, 3R. The upper part of the front wheel support arm 6 is supported on the machine body 2 so as to be rotatable around a horizontal axis (an axis extending in the machine body width direction K2). The front wheel support arm 6 includes a front wheel support arm 6L provided on the left side of the machine body 2, and a front wheel support arm 6R provided on the right side of the machine body 2. The front wheel 3L is rotatably attached to the lower part of the front wheel support arm 6L. The front wheel 3R is rotatably attached to the lower part of the front wheel support arm 6R.

The vehicle body 2 is provided with a wheel support 7 that supports the rear wheels 4L, 4R. The upper part of the wheel support 7L is supported on the vehicle body 2 so as to be rotatable around a horizontal axis (an axis extending in the vehicle width direction K2). The wheel support 7 includes a wheel support 7L that supports the rear wheel 4L, and a wheel support 7R that supports the rear wheel 4R. The wheel support 7L is provided on the left side of the vehicle body 2. The rear wheel 4L is rotatably attached to the lower part of the wheel support 7L. The wheel support 7R is provided on the right side of the vehicle body 2. The rear wheel 4R is rotatably attached to the lower part of the wheel support 7R.

The front wheel support arms 6L, 6R and the wheel supports 7L, 7R can be swung up and down around a horizontal axis (an axis extending in the width direction K2 of the machine body) by a lifting cylinder 14 described later. The lifting cylinder 14 is composed of a hydraulic cylinder. Driving the lifting cylinder 14 rotates the front wheel support arm 6 and the wheel support 7 around the horizontal axis. This changes the angle between the front wheel support arm 6 and the wheel support 7, and the front wheels 3L, 3R and the rear wheels 4L, 4R rise and fall relative to the machine body 2. By simultaneously raising and lowering the front wheels 3L, 3R and the rear wheels 4L, 4R relative to the machine body 2, the machine body 2 rises and falls relative to the ground.

The transplanter 1 has a transplanting section 8 that plants seedlings in a field, a seedling supplying section 9 that supplies seedlings to the transplanting section 8, and a compacting section (soil covering section) 10 that compacts and covers the soil near the planted seedlings. The transplanting section 8, seedling supplying section 9, and compacting section 10 are provided on the machine body 2. The transplanting section 8 has a planting device 20 and is provided at the front of the machine body 2. The seedling supplying section 9 is provided at the front of the machine body 2, above the transplanting section 8. The compacting section 10 is provided at the front of the machine body 2, near the planting device 20.

A chair (seat) 11 is mounted on the upper part of the machine body 2. The chair 11 is a chair on which an operator who supplies seedlings to the seedling supplying unit 9 sits. The chair 11 is disposed behind the seedling supplying unit 9. The operator can supply seedlings to the seedling supplying unit 9 in a sitting position facing forward. The transplanter 1 is a ride-on type transplanter that allows the operator to travel and perform transplanting work while sitting on the chair 11.
A step 12 on which a worker can place his/her feet when getting on and off the chair 11 is disposed in front and to the side of the chair 11. The step 12 also functions as a footrest on which a worker sitting on the chair 11 can place his/her feet.

The boarding and alighting steps 12 are arranged in a position between the rear wheels 4L, 4R and the chair 11 in the width direction of the vehicle. The boarding and alighting steps 12 include a first boarding and alighting step 12L and a second boarding and alighting step 12R. The first boarding and alighting step 12L is arranged in front of and to the left of the chair 11 (i.e., the left front). The second boarding and alighting step 12R is arranged in front of and to the right of the chair 11 (i.e., the right front).

<Seedling Supply Department>
Next, the seedling supply unit 9 will be described.
1, 5, and 6, the seedling supply unit 9 has seedling supply cups 40A and 40B. In the following description, the seedling supply cup 40A may be referred to as the first seedling supply cup 40A, and the seedling supply cup 40B may be referred to as the second seedling supply cup 40B.

The seedling supply cups 40A, 40B can hold seedlings supplied from above by an operator seated on a chair 11, and the bottoms can be opened and closed so that the seedlings can be dropped downward for discharge. The seedlings that drop from the seedling supply cups 40A, 40B are supplied to the planting device 20.
As shown in Figures 1 and 5, the seedling supply cups 40A and 40B are arranged at regular intervals in a loop shape that is long and oval in the width direction K2 of the machine body in a plan view. The seedling supply cup 40A drops and discharges seedlings to the left of the center in the width direction of the machine body (position indicated by reference symbol 74L). The seedling supply cup 40B drops and discharges seedlings to the right of the center in the width direction of the machine body (position indicated by reference symbol 74R). The seedling supply cups 40A and 40B are arranged alternately along the oval cup arrangement path (arrangement path of the seedling supply cups 40A and 40B) C1.

5, the seedling supplying section 9 has a cup transport mechanism 41 that transports the seedling supplying cups 40A and 40B. The seedling supplying cups 40A and 40B are transported by the cup transport mechanism 41 in a circular manner along a cup arrangement path C1 in the direction indicated by the arrow A1.
As shown in Fig. 6, seedling supply cups 40A, 40B have a cylindrical cup body 44 with openings at the top and bottom, and a bottom lid 45 that can be opened and closed to cover the bottom opening of the cup body 44. The bottom lid 45 is pivoted about a horizontal axis perpendicular to the cup transfer direction A1 by a pivot part 46 provided on the cup transfer direction A1 side. The bottom lid 45 opens the bottom opening of the cup body 44 by rotating downward about the pivot part 46 from a state in which the bottom lid 45 covers the bottom opening of the cup body 44 (see arrow J1 in Fig. 6). This allows the seedlings to fall.

7, the bottom lids 45 of the seedling supply cups 40A and 40B are provided with protrusions 47 that protrude in a horizontal direction perpendicular to the cup transfer direction A1. The protrusions 47 of the first seedling supply cup 40A protrude on the outer periphery of the cup arrangement path C1, and the protrusions 47 of the second seedling supply cup 40B protrude on the inner periphery of the cup arrangement path C1.
The cup transfer mechanism 41 is a mechanism for transferring the seedling supply cups 40A, 40B in the cup transfer direction A1 along the oval cup arrangement path. As shown in Fig. 5, the cup transfer mechanism 41 is disposed on the inner periphery of the oval cup arrangement path C1 of the seedling supply cups 40A, 40B. The cup transfer mechanism 41 has a drive sprocket 48 disposed on the left side of the cup arrangement path C1, a driven sprocket 49 disposed on the right side of the cup arrangement path C1, and an oval annular transfer chain 50 wound around the drive sprocket 48 and the driven sprocket 49.

As shown in Fig. 5, the cup body 44 of the seedling supply cups 40A, 40B is provided with a connecting portion 51 located on the inner periphery of the cup arrangement path. The connecting portion 51 is connected to the transport chain 50 via a connecting pin (not shown) erected on the transport chain 50.
The sprocket drive shaft 53, which drives the drive sprocket 48 of the cup transfer mechanism 41, is driven to rotate around a vertical axis by power from the prime mover 17. The power from the prime mover 17 is taken out by a transmission shaft 54 (see FIG. 5) extending leftward from the transmission case M1 and transmitted to the sprocket drive shaft 53 via a first power transmission mechanism 55 and a second power transmission mechanism 56. The first power transmission mechanism 55 is a mechanism that transmits the power from the transmission shaft 54 forward, and is composed of a sprocket, a chain, etc. The second power transmission mechanism 56 is a mechanism that transmits the power transmitted by the first power transmission mechanism 55 upward, and is composed of a bevel gear, a universal joint, a transmission shaft, etc.

The bottom lids 45 of the seedling supply cups 40A and 40B are configured to open at different positions on the cup placement path C1. In FIG. 7, the position where the bottom lid 45 of the seedling supply cup 40A opens (first seedling drop section) is indicated by the symbol 74L, and the position where the bottom lid 45 of the seedling supply cup 40B opens (second seedling drop section) is indicated by the symbol 74R. The first seedling drop section 74L and the second seedling drop section 74R are in the same position in the front-to-rear direction, but are in different positions in the width direction of the machine. The first seedling drop section 74L drops seedlings toward the first planting device 20L described later. The second seedling drop section 74R drops seedlings toward the second planting device 20R described later.

The position where the bottom cover 45 of the seedling supplying cup 40A opens (first seedling dropping section 74L) is determined by the first determining member. The position where the bottom cover 45 of the seedling supplying cup 40B opens (second seedling dropping section 74R) is determined by the second determining member. The first determining member and the second determining member are plate-like or rod-like members (not shown) and are disposed below the bottom cover 45.
The first regulating member supports the protruding portion 47 of the bottom cover 45 of the seedling supply cup 40A from below in a portion other than the first seedling dropping portion 74L, and prevents the bottom cover 45 of the seedling supply cup 40A from opening downward. As a result, the bottom cover 45 of the seedling supply cup 40A does not open in a portion other than the first seedling dropping portion 74L, but opens at the first seedling dropping portion 74L.

The second regulating member supports the protruding portion 47 of the bottom cover 45 of the seedling supply cup 40B from below in the portion other than the second seedling dropping portion 74R, and prevents the bottom cover 45 of the seedling supply cup 40B from opening downward. As a result, the bottom cover 45 of the seedling supply cup 40B does not open in the portion other than the second seedling dropping portion 74R, but opens at the second seedling dropping portion 74R.
The first and second defining members are capable of changing their positions in the width direction of the machine body. By changing the positions of the first and second defining members in the width direction of the machine body, the positions of the first seedling dropping section 74L and the second seedling dropping section 74R in the width direction of the machine body can be changed.

On the cup placement path C1, there is provided a first closing member (not shown) that pushes up to close the bottom lid 45 of the seedling supply cup 40A opened by the first seedling dropping section 74L, and a second closing member (not shown) that pushes up to close the bottom lid 45 of the seedling supply cup 40B opened by the second seedling dropping section 74R. The first closing member is provided downstream in the transport direction of the first seedling dropping section 74L. The second closing member is provided downstream in the transport direction of the second seedling dropping section 74R.

<Transplantation area>
Next, the transplant part 8 will be described.
As shown in Figures 8, 9, 10 and 11, the transplanter 1 has a drive shaft 77 extending in the width direction K2 of the machine body. The drive shaft 77 is an axis that drives the planting device 20 of the transplanting section 8. The drive shaft 77 is formed in a rod shape with a hexagonal cross section. The power of the prime mover 17 is transmitted to the drive shaft 77 from the transmission shaft 54 (see Figure 5) extending from the transmission case M1 via the first power transmission mechanism 55. As a result, the drive shaft 77 rotates around its axis in the width direction of the machine body.

As shown in Figures 8, 9, and 10, the planting device 20 includes a first planting device 20L and a second planting device 20R. The first planting device 20L and the second planting device 20R are arranged side by side in the width direction of the machine body. The first planting device 20L is arranged on one side (left side) in the width direction of the machine body. The second planting device 20R is arranged on the other side (right side) in the width direction of the machine body. The first planting device 20L and the second planting device 20R have the same structure except that they are symmetrical about the center in the width direction of the machine body.

As shown in Figures 8, 9, etc., the planting device 20 has a lifting member 70, a mounting body 81, a lifting device 82, and a transmission mechanism 83.
The lifting member 70 is provided so as to be able to rise and fall relative to the machine body 2. The lifting member 70 has a planting tool 80 that plants seedlings in the ground of the field, and a seedling guide 75 arranged above the planting tool 80. The planting tool 80 holds the seedlings and descends, and at the lowered position, penetrates into the ground of the field to plant the seedlings in the field. The seedling guide 75 is arranged above the planting tool 80 and guides the seedlings that fall from a relay hopper 71 (described later) toward the planting tool 80.

As shown in FIG. 11, the planting tool 80 is beak-shaped with its tip facing downward. The planting tool 80 has a front component 80F and a rear component 80B, and can be opened and closed by moving the components 80F and 80B away from each other in the front-to-rear direction. When the planting tool 80 is closed, seedlings can be supplied from above and seedlings can be stored inside, and when it is open, seedlings can be dropped and released downward.

8 and 11 , the mounting body 81 is attached to the fixed shaft 60. The fixed shaft 60 is fixed to the front of the aircraft body 2 and extends in the aircraft body width direction. The mounting body 81 is composed of a mounting base 84 attached to the fixed shaft 60, and a transmission mechanism support member 85 extending forward from the mounting base 84.
The mounting base 84 is attached to the fixed shaft 60 by the mounting member 72. The mounting base 84 is detachably attached to the mounting member 72. The mounting base 84 and the mounting member 72 are fixed by a bolt BL1 and a nut NT1. The mounting member 72 has a U-shaped notch 72a with an open front. The fixed shaft 60 is sandwiched between the mounting base 84 and the mounting member 72 by being inserted into the notch 72a. The mounting base 84 and the mounting member 72 can be moved in the width direction of the machine along the fixed shaft 60 by loosening the screw engagement between the bolt BL1 and the nut NT1. This allows the positions of the first planting device 20L and the second planting device 20R in the width direction of the machine to be changed individually. In addition, the positions of the lifting member 70 of the first planting device 20L in the width direction of the machine and the positions of the lifting member 70 of the second planting device 20R in the width direction of the machine can be adjusted.

The drive shaft 77 passes through the transmission mechanism support member 85. The drive shaft 77 is supported by a bearing 86 (see FIG. 10) attached to the transmission mechanism support member 85 so as to be rotatable about an axis in the width direction of the aircraft. The mounting body 81 (mounting base 84, transmission mechanism support member 85) is movable in the width direction of the aircraft along the drive shaft 77. The mounting body 81 includes a first mounting body 81L and a second mounting body 81R. The first mounting body 81L and the second mounting body 81R have the same structure except that they are symmetrical about the center in the width direction of the aircraft.

The transmission mechanism 83 is a mechanism that transmits power from the drive shaft 77 to the lifting device 82. As shown in Figures 10 and 11, the transmission mechanism 83 has a drive sprocket 87, a driven sprocket 88, a transmission chain 89 wound around these sprockets, and a tension member 90 that applies tension to the transmission chain 89. The drive sprocket 87 rotates with the rotation of the drive shaft 77, and the power of this rotation is transmitted to the driven sprocket 88 via the transmission chain 89. A transmission shaft 91 that transmits power to the lifting device 82 is fixed to the driven sprocket 88.

The lifting device 82 is attached to the mounting body 81 and lifts and lowers the lifting member 70 .
The lifting device 82 has a first rotating case 92, a second rotating case 93, a cup support 94, and a spring 95. The first rotating case 92 is rotatably supported via a transmission shaft 91 on the front end side of the transmission mechanism support member 85. The second rotating case 93 is rotatably supported on the free end side (the side not supported by the transmission shaft 91) of the first rotating case 92. The cup support 94 is supported by the second rotating case 93. The planting tool 80 and the seedling guide 75 are supported on the cup support 94. The spring 95 is a tension spring, and biases the cup support 94 upward. The upper end of the spring 95 is fixed to the lower part of the seedling supply unit 9.

The lifting device 82 includes a power transmission mechanism provided in the first rotating case 92 and the second rotating case 93. When the first rotating case 92 is rotationally driven by the transmission shaft 91, this power transmission mechanism rotates the second rotating case 93 in the opposite direction to the first rotating case 92 in conjunction with the rotation of the first rotating case 92. When the first rotating case 92 is rotationally driven, the cup support 94 moves up and down, thereby lifting and lowering the planting tool 80.

When the lifting member 70 (planting tool 80, seedling guide 75) is in the raised position, the seedling supply unit 9 drops and supplies the seedlings to the planting tool 80. Specifically, when the planting tool 80 is in the raised position (top dead center position), the bottom lids 45 of the seedling supply cups 40A, 40B located above the planting tool 80 open, and the seedlings are dropped and discharged.
The seedlings discharged from the seedling supply cups 40A, 40B pass through the relay hopper 71 and the seedling guide 75 and are dropped into the planting tool 80. At this time, the planting tool 80 is in a closed state (see FIG. 12(b)), and the seedlings are held inside the planting tool 80. The planting tool 80 then descends while still holding the seedlings, and the lower part of the planting tool 80 enters the field (ridge). Once the planting tool 80 enters the ridge, it opens (see FIG. 12(s)), forms a planting hole in the ridge, and releases the seedling into this planting hole (planting the seedling).

In the transplanter 1 of this embodiment, the left planting tool 80 (the planting tool 80 of the first planting device 20L) and the right planting tool 80 (the planting tool 80 of the second planting device 20R) do not rise and fall at the same time, but when one planting tool 80 rises, the other planting tool 80 descends. This allows two rows of seedlings to be planted in a staggered pattern in the furrows as the transplanter 1 moves forward. Figures 7, 8, and 9 show the state in which the right planting tool 80 (the planting tool 80 of the second planting device 20R) is descending and the left planting tool 80 (the planting tool 80 of the first planting device 20L) is ascending.

As shown in Figures 8 and 9, the seedling guide 75 is positioned above the planting tool 80. The seedling guide 75 is located below the seedling supply cup 40A located in the first seedling dropping section 74L and below the seedling supply cup 40B located in the second seedling dropping section 74R. The seedling guide 75 is formed in a generally truncated conical cylinder with top and bottom openings that narrows in diameter as it goes downward. The front and rear parts of the upper edge of the seedling guide 75 are curved so that the center of the seedling guide 75 in the width direction of the machine body is higher. The left and right parts of the upper edge of the seedling guide 75 are curved so that the center of the seedling guide 75 in the front-to-rear direction is lower.

The seedling guide 75 guides the seedlings discharged from the seedling supply cups 40A, 40B to the planting tool 80 below. Specifically, after being discharged from the seedling supply cups 40A, 40B, it guides the seedlings that fall from the relay hopper 71 (described below) toward the planting tool 80. The seedling guide 75 rises and falls together with the planting tool 80 as the cup support 94 moves up and down. Therefore, when the left planting tool 80 rises, the left seedling guide 75 also rises, and when the right planting tool 80 descends, the right seedling guide 75 also descends.

9, 12, and 13, the relay hopper 71 is disposed between the lifting member 70 and the seedling supply unit 9. Specifically, the relay hopper 71 is disposed below the seedling supply unit 9 and above the lifting member 70. The relay hopper 71 relays the drop supply of seedlings from the seedling supply unit 9 to the lifting member 70. Note that the relay hopper 71 is not shown in FIG. 8.
The relay hopper 71 is formed in a generally truncated conical cylinder shape with upper and lower openings, the diameter of which decreases as it extends downward. The relay hopper 71 has an inner surface with a different inclination angle (inclination angle with respect to the vertical direction) in the circumferential direction. At least a portion of the inner surface of the relay hopper 71 extends generally vertically from the upper end to the lower end. In the case of this embodiment, as shown in FIG. 13 , the inner surface of one side (left side) in the machine body width direction of the relay hopper 71 extends generally vertically from the upper end to the lower end. The inclination angle of the inner surface of one side (left side) in the machine body width direction of the relay hopper 71 is different from the inclination angle of the inner surface of the other side (right side) in the machine body width direction.
is smaller than the inclination angle of the inner surface of the

The relay hopper 71 is made of an elastic material (e.g., rubber, etc.). The relay hopper 71 may be an integrally molded product, but in the present embodiment, the relay hopper 71 is formed by rolling a sheet made of an elastic material into a cylindrical shape.
14 shows a sheet 73 made of an elastic material that constitutes the relay hopper 71. The sheet 73 is formed in a substantially arc-shaped band. The sheet 73 has a first edge 73a, a second edge 73b, a third edge 73c, and a fourth edge 73d. The first edge 73a constitutes the upper edge of the relay hopper 71. The second edge 73b constitutes the lower edge of the relay hopper 71. The third edge 73c and the fourth edge 73d extend from the upper edge of the relay hopper 71 toward the lower edge.

The sheet 73 has a plurality of first holes 73e arranged along the first edge 73a, a plurality of second holes 73f arranged along the third edge 73c, and a plurality of third holes 73g arranged along the fourth edge 73d. The first holes 73e are holes for attaching the intermediate hopper 71 formed by rolling the sheet 73 to the holder 61 described later. The second holes 73f and the third holes 73g are arranged in positions where they overlap each other when the sheet 73 is rolled. The sheet 73 is held in a rolled truncated cone shape by overlapping the second holes 73f and the third holes 73g and connecting them by inserting a connecting tool such as a screw into the second holes 73f and the third holes 73g, and the intermediate hopper 71 is formed.

As shown in Figures 8, 9, 12 and 13, the transplanter 1 is provided with a holder 61 that holds the upper part of the relay hopper 71. The holder 61 is made of a rigid material such as metal.
As shown in FIG. 15 , the holder 61 has a frame 62 and a fixing portion 63 .
The frame body 62 is formed in a ring shape in a plan view. The frame body 62 is attached along the periphery of the upper part of the relay hopper 71. The frame body 62 is provided with a plurality of mounting holes 62a. The upper part of the relay hopper 71 can be attached to the frame body 62 by overlapping the mounting holes 62a with the first holes 73e of the sheet 73 and inserting a connector such as a screw into the first holes 73e and the mounting holes 62a to connect them. The frame body 62 has a length (inner diameter) in the machine width direction longer than the length (inner diameter) in the front-rear direction. Therefore, the relay hopper 71 attached to the frame body 62 has a length (inner diameter) in the machine width direction longer than the length (inner diameter) in the front-rear direction.

The fixing portion 63 is a portion for fixing the frame body 62 to a position below the seedling supplying unit 9. By fixing the frame body 62 to a position below the seedling supplying unit 9, the position of the frame body 62 relative to the machine body 2 is fixed. As a result, the position of the relay hopper 71 attached to the frame body 62 relative to the machine body 2 is fixed.
13, the fixing part 63 is provided on the inside of the frame 62. The fixing part 63 has a vertical part 63a extending downward from the inside of the frame 62 and a horizontal part 63b bending from the lower end of the vertical part 63a and extending horizontally. A long hole 63c is formed in the horizontal part 63b.

As shown in Figures 8 and 9, the fixed part 63 (horizontal part 63b) is fixed to the transmission mechanism support member 85. Specifically, the fixed part 63 is fixed to the upper part of the transmission mechanism support member 85 via the stay 64. This fixes the holder 61 to the upper part of the transmission mechanism support member 85. The fixed part 63 is fixed to the upper part of the stay 64 by a bolt and nut inserted into the long hole 63c. The long hole 63c extends in the width direction of the aircraft. Therefore, by loosening the screw engagement of the bolt and nut, the position of the holder 61 in the width direction of the aircraft relative to the stay 64 can be adjusted.

As described above, the transmission mechanism support member 85 is movable in the width direction of the machine body along the drive shaft 77. Therefore, the holder 61 and the relay hopper 71 are also movable in the width direction of the machine body along the drive shaft 77.
9 and 13, the relay hopper 71 includes a first relay hopper 71L disposed on one side in the width direction of the machine body, and a second relay hopper 71R disposed on the other side in the width direction of the machine body. The holder 61 includes a first holder 61L that holds the first relay hopper 71L, and a second holder 61R that holds the second relay hopper 71R.

As shown in Fig. 7, the first holder 61L is disposed below the first seedling dropping section 74L. The second holder 61R is disposed below the second seedling dropping section 74R. As a result, the first relay hopper 71L is disposed below the first seedling dropping section 74L. The second relay hopper 71R is disposed below the second seedling dropping section 74R.
The seedlings that have fallen from the first seedling dropping section 74L are supplied to the lifting member 70 (seedling guide 75, planting tool 80) of the first planting device 20L through the first relay hopper 71L. The seedlings that have fallen from the second seedling dropping section 74R are supplied to the lifting member 70 (seedling guide 75, planting tool 80) of the second planting device 20R through the second relay hopper 71R.

12(b), the relay hopper 71 is disposed in a position where it comes into contact with the lifting member 70 when the lifting member 70 is in the raised position. Specifically, when the planting tool 80 is in the raised position, the seedling guide 75 comes into contact with the relay hopper 71.
When the planting tool 80 is in the raised position, the lower part of the relay hopper 71 is inserted into the upper part of the seedling guide 75. As a result, when the planting tool 80 is in the raised position, the lower part of the relay hopper 71 comes into contact with the upper part of the seedling guide 75 (see FIG. 12(b)).

When the planting tool 80 is in the raised position, the seedling guide 75 comes into contact with the relay hopper 71, applying an impact to the relay hopper 71, which is made of an elastic body. This impact causes the relay hopper 71, which is made of an elastic body, to elastically deform, and when the seedling guide 75 leaves the relay hopper 71, it tries to return to its original shape. This deformation or other movement of the relay hopper 71 makes it possible to drop the seedlings from the relay hopper 71 even if the seedlings become clogged or stuck in the relay hopper 71. This allows the seedlings to be smoothly and reliably supplied from the seedling supply unit 9 to the planting tool 80 via the relay hopper 71.

<Suppression section (suppression wheel (ground wheel), etc.)>
Next, the suppressing section 10 will be described.
As shown in Figures 8 and 9, the suppression unit 10 has a suppression wheel 100. The suppression wheel 100 includes a first suppression wheel 100L and a second suppression wheel 100R. The first suppression wheel 100L and the second suppression wheel 100R are arranged side by side in the vehicle width direction. The first suppression wheel 100L is arranged on one side (left side) in the vehicle width direction. The second suppression wheel 100R is arranged on the other side (right side) in the vehicle width direction.

The first and second crushing wheels 100L and 100R each consist of a pair (two) of crushing wheels aligned in the width direction of the machine. The pair of crushing wheels of the first crushing wheel 100L are arranged on the left and right sides of the planting tool 80 of the first planting device 20L in the width direction of the machine. The pair of crushing wheels of the second crushing wheel 100R are arranged on the left and right sides of the planting tool 80 of the second planting device 20R in the width direction of the machine.

The first suppression wheel 100L is supported by the first support 21L via the first bracket 101L. The second suppression wheel 100R is supported by the second support 21R via the second bracket 101R. The support structure of the first suppression wheel 100L by the first support 21L, etc. and the support structure of the second suppression wheel 100R by the second support 21R, etc. are the same except that they are symmetrical about the center in the width direction of the aircraft. In the following explanation, when the first support 21L and the second support 21R are explained together, they are referred to as the support 21.

The suppression wheel 100 is a wheel that suppresses the soil on the sides (left and right) of the seedlings planted by the first planting device 20L and the second planting device 20R, and also gathers the soil toward the seedlings to cover the base of the seedlings; it is also called a soil cover wheel. The suppression wheel 100 is a ground wheel that touches the ground (planting surface) of the field and moves up and down following the undulations of the ground (planting surface). Therefore, in the following explanation, the suppression wheel may be referred to as a "ground wheel." Specifically, the suppression wheel 100 may be referred to as the "ground wheel 100," the first suppression wheel 100L as the "first ground wheel 100L," and the second suppression wheel 100R as the "second ground wheel 100R."

As shown in Fig. 16, the support 21 is bent in an L-shape and has a portion extending in the front-rear direction and a portion extending in the width direction of the aircraft. The front end of the portion extending in the front-rear direction is attached to a support tube 102. The suppression wheel 100 is attached to the portion extending in the width direction of the aircraft via a first bracket 101L or a second bracket 101R. A shaft 103 extending in the width direction of the aircraft is inserted into the support tube 102. The support tube 102 is rotatable around the shaft 103.

8 and 16, the support tube 102 is attached to a movable shaft 65. The movable shaft 65 is swingable relative to the fixed shaft 60 and extends in the width direction of the aircraft. The movable shaft 65 includes a first movable shaft 65L connected to be interlocked with the first suppression wheel (first ground contact wheel) 100L, and a second movable shaft 65R connected to be interlocked with the second suppression wheel (second ground contact wheel) 101R.
The first movable shaft 65L and the second movable shaft 65R extend in the width direction of the aircraft body. The first movable shaft 65L is disposed to the left of the center in the width direction of the aircraft body. The second movable shaft 65R is disposed to the right of the center in the width direction of the aircraft body.

As shown in Figures 8, 9, and 16, the support tube 102 includes a first support tube 102L attached to the first support 21L and a second support tube 102R attached to the second support 21R. As shown in Figure 16, the first support tube 102L is attached to the first movable shaft 65L via a first linkage mechanism 200L. The second support tube 102R is attached to the second movable shaft 65R via a second linkage mechanism 200R.

As shown in FIG. 16 etc., the first linkage mechanism 200L links the first support tube 102L and the first movable shaft 65L. The second linkage mechanism 200R links the second support tube 102R and the second movable shaft 65R. The first linkage mechanism 200L has an upper member 201L, a lower member 202L, and an intermediate member 203L. The second linkage mechanism 200R has an upper member 201R, a lower member 202R, and an intermediate member 203R.

The upper member 201L is engaged with the first movable shaft 65L. The lower member 202L is attached to the first support tube 102L. The intermediate member 203L connects the upper member 201L and the lower member 202L. The upper member 201R is engaged with the second movable shaft 65R. The lower member 202R is attached to the second support tube 102R. The intermediate member 203R connects the upper member 201R and the lower member 202R. The upper member 201L can move in the width direction of the aircraft along the first movable shaft 65L. The upper member 201R can move in the width direction of the aircraft along the second movable shaft 65R.

The first plate 204L is fixed to the right of the first movable shaft 65L. The second plate 204R is fixed to the left of the second movable shaft 65R. As shown in FIG. 20, the first plate 204L has one mounting portion 204La and the other mounting portion 204Lb. The one mounting portion 204La and the other mounting portion 204Lb are disposed on opposite sides of the first movable shaft 65L. The second plate 204R has one mounting portion 204Ra and the other mounting portion 204Rb. The one mounting portion 204Ra and the other mounting portion 204Rb are disposed on opposite sides of the second movable shaft 65R.

The one mounting portion 204La and the one mounting portion 204Ra are pivotally supported by a pivot 205 on a support member 206. As shown in FIG. 8, the support member 206 is attached to a fixed shaft 60 via a holding member 207. The first plate 204L and the second plate 204R can swing around the pivot 205. The first movable shaft 65L moves with the swinging of the first plate 204L, and the second movable shaft 65R moves with the swinging of the second plate 204R. The first plate 204L and the second plate 204R can swing independently of each other. Therefore, the first movable shaft 65L and the second movable shaft 65R can move independently of each other.

When the first suppression wheel (first ground contact wheel) 100L rises and falls in response to the undulations of the ground (planting surface), this rise and fall is transmitted to the first movable shaft 65L via the first linkage mechanism 200L, and the first movable shaft 65L swings around the pivot 205 together with the first plate 204L.
When the first suppressing wheel 100L rises, the first plate 204L swings such that the other mounting portion 204Lb moves forward and the one mounting portion 204La moves backward. When the first suppressing wheel 100L descends, the first plate 204L swings such that the other mounting portion 204Lb moves backward and the one mounting portion 204La moves forward. With this swing of the first plate 204L, the first movable shaft 65L attached to the first plate 204L also swings.

When the second suppression wheel (second ground contact wheel) 100R rises and falls following the undulations of the ground (planting surface), this rise and fall is transmitted to the second movable shaft 65R via the second linkage mechanism 200R, and the second movable shaft 65R swings around the pivot 205 together with the second plate 204R. Specifically, when the second suppression wheel 100R rises, the second plate 204R swings so that the other mounting part 204Rb moves forward and the one mounting part 204Ra moves backward. When the second suppression wheel 100R descends, the second plate 204R swings so that the other mounting part 204Rb moves backward and the one mounting part 204Ra moves forward. With this swing of the second plate 204R, the second movable shaft 65R attached to the second plate 204R also swings.

As shown in Figures 8 and 9, the support tube 102 to which the support 21 is attached is connected to the transmission mechanism support member 85 of the attachment body 81 by a connecting member 112. In other words, the support 21 is attached to the attachment body 81 via the support tube 102 and the connecting member 112. The first support 21L is attached to the first attachment body 81L, and the second support 21R is attached to the second attachment body 81R. The first support 21L can move in the aircraft width direction along the drive shaft 77 together with the first attachment body 81L. The second support 21R can move in the aircraft width direction along the drive shaft 77 together with the second attachment body 81R.

The first linkage mechanism 200L can move in the width direction of the machine along the first movable shaft 65L in association with the movement of the first support 21L and the first mounting body 81L. The second linkage mechanism 200R can move in the width direction of the machine along the second movable shaft 65R in association with the movement of the second support 21R and the second mounting body 81R. By moving the first linkage mechanism 200L in the width direction of the machine, the position of the first suppression wheel (first ground contact wheel) 100L in the width direction of the machine can be adjusted. By moving the second linkage mechanism 200R in the width direction of the machine, the position of the second suppression wheel (second ground contact wheel) 100R in the width direction of the machine can be adjusted.

<Aircraft control mechanism>
The transplanter 1 is equipped with a machine control mechanism for controlling the height and attitude of the machine body 2.
The machine body control mechanism includes a lifting mechanism and a swinging mechanism. The lifting mechanism is a mechanism that varies the height of the machine body 2 relative to the wheels (front wheels, rear wheels) so as to maintain a constant height of the machine body 2 from the planting surface. The swinging mechanism is a mechanism that swings the machine body around a longitudinal axis so as to reduce the difference in height from the planting surface between the left and right parts of the machine body 2. The lifting mechanism and the swinging mechanism share some of the same components (parts).

First, the basic configuration of the lifting mechanism and the swinging mechanism will be described.
First, the basic configuration of the lifting mechanism will be described.
The lifting mechanism includes a lifting cylinder 14 (see FIG. 17) that varies the height of the machine body 2 by telescopic drive. The lifting cylinder 14 is attached to the machine body frame 13. The lifting cylinder 14 is composed of a hydraulic cylinder. The lifting cylinder 14 is connected to a lifting control valve (not shown) via a hydraulic hose through which hydraulic oil flows. The lifting cylinder 14 telescopically operates by operating a spool of the lifting control valve to switch the flow of hydraulic oil supplied to the lifting cylinder 14.

As shown in FIG. 17, the lift cylinder 14 has a cylinder shaft 14a that expands and contracts (advances and retreats) in the front-rear direction. A first operating shaft 22 is connected to the tip of the cylinder shaft 14a of the lift cylinder 14. The first operating shaft 22 extends in the width direction of the machine body. As shown in FIGS. 17, 18, and 19, a first operating plate 23 is attached to one end side (left end side) and the other end side (right end side) of the first operating shaft 22. The first operating plate 23 moves in the front-rear direction (white arrow direction) as the cylinder shaft 14a of the lift cylinder 14 expands and contracts. A second operating shaft 24 extending in the width direction of the machine body is attached to the first operating plate 23. One end of a connecting rod 25 is pivotally attached to the second operating shaft 24. The other end of the connecting rod 25 is connected to a connecting plate 27 via a first shaft body 26. The connecting plate 27 is fixed to the outer circumferential surface of a cylinder 28 that extends in the width direction of the vehicle. The upper part of the wheel supports 7L, 7R that support the rear wheels 4L, 4R is connected to the end of the cylinder 28 on the outer side of the vehicle via a first inner cylinder 262 described below. The front wheel support mechanism 30 is connected to the connecting plate 27 via a first shaft 26.

The front wheel support mechanism 30 includes a front wheel support mechanism 30L that supports the front wheel 3L, and a front wheel support mechanism 30R that supports the front wheel 3R.
The front wheel support mechanism 30 has a first member 31, a second member 32, and a front wheel support arm 6. One end of the first member 31 is pivotally supported by the first shaft body 26, and the other end is connected to the second member 32 via the second shaft body 34. One end of the second member 32 is pivotally supported by the second shaft body 34, and the other end is connected to a third shaft body 35. One end of the front wheel support arm 6 is connected to the third shaft body 35, and the front wheels 3L, 3R are attached to the other end.

Figures 18, 19, and 1 to 4 show the state in which the height of the machine body 2 relative to the wheels is at its highest, in other words, the state in which the height of the machine body 2 from the ground (planting surface) is at its highest. When the lifting cylinder 14 is extended from this state, the first operating shaft 22 moves forward (see arrow X1 in Figure 18). Accordingly, the connecting rod 25 moves backward (see arrow X2), and the cylindrical body 28 rotates together with the connecting plate 27 (see arrow X3). As a result, the wheel supports 7L, 7R rotate around the cylindrical body 28, and the rear wheels 4L, 4R attached to the lower part of the wheel supports 7L, 7R move backward while rising (see arrow X4). In addition, the front wheels 3L, 3R move forward while rising due to the movement of the front wheel support mechanism 30 accompanying the rotation of the connecting plate 27 (see arrow X5). In this way, when the lifting cylinder 14 is extended, the front wheels 3L, 3R move forward while rising, and the rear wheels 4L, 4R move backward while rising. This increases the distance between the front wheels 3L, 3R and the rear wheels 4L, 4R in the fore-and-aft direction, and the machine body 2 descends relative to the wheels (front wheels, rear wheels). As a result, the height of the machine body 2 from the ground (planting surface) decreases.

When the lift cylinder 14 is contracted from a state in which the vehicle body 2 is lowered, the first operating shaft 22 moves backward (see arrow X6). Accordingly, the connecting rod 25 moves forward, and the cylinder 28 rotates together with the connecting plate 27 in the opposite direction to the arrow X3. As a result, the wheel supports 7L, 7R rotate around the cylinder 28 in the opposite direction to the arrow X3, and the rear wheels 4L, 4R attached to the lower parts of the wheel supports 7L, 7R move forward while descending. In addition, the front wheels 3L, 3R move backward while descending due to the movement of the front wheel support mechanism 30 accompanying the rotation of the connecting plate 27. In this way, when the lift cylinder 14 is contracted, the front wheels 3L, 3R move backward while descending, and the rear wheels 4L, 4R move forward while descending. As a result, the distance between the front wheels 3L, 3R and the rear wheels 4L, 4R in the fore-and-aft direction becomes shorter, and the vehicle body 2 rises relative to the wheels (front wheels, rear wheels). As a result, the height of aircraft 2 above the ground increases.

In the above-described embodiment, the aircraft body 2 is lowered by extending the lift cylinder 14 and is raised by shortening the lift cylinder 14, but the aircraft body 2 may be raised by extending the lift cylinder 14 and is lowered by shortening the lift cylinder 14.
The lifting mechanism varies the height of the machine body 2 relative to the wheels (front and rear wheels) so as to maintain a constant height of the machine body 2 from the planting surface (the surface on which seedlings are planted by the planting tool 80, for example the top surface of a ridge). Specifically, the lifting cylinder 14 expands and contracts in conjunction with the fluctuation in height of the suppression wheel (ground wheel) 100, which moves up and down following the undulations of the planting surface, to raise and lower the machine body 2. This makes it possible to maintain a substantially constant height of the machine body 2 from the planting surface (specifically, the height of the planting tools 80 of the first planting device 20L and the second planting device 20R from the planting surface) even if the planting surface is undulating.

Next, the basic configuration of the rocking mechanism will be described.
The swing mechanism includes a swing cylinder 36 that swings the machine body 2 around an axis in the front-rear direction by telescopic drive. As shown in Figs. 17 and 18, the swing cylinder 36 is attached to one side of the machine body frame 13 (the left side in this embodiment). The swing cylinder 36 has a cylinder shaft 36a that is arranged diagonally forward and upward and telescopic (moves forward and backward). The swing cylinder 36 is composed of a hydraulic cylinder. The swing cylinder 36 is connected to a swing control valve (not shown) via a hydraulic hose through which hydraulic oil flows. The swing cylinder 36 expands and contracts by operating a spool of the swing control valve to switch the flow of hydraulic oil supplied to the swing cylinder 36.

As shown in Figures 17 and 18, a third operating shaft 37 is connected to the tip of the cylinder shaft 36a of the swing cylinder 36. The third operating shaft 37 extends in the width direction of the aircraft body. A second operating plate 38 is attached to the third operating shaft 37. The first operating shaft 22 and the second operating shaft 24 are also attached to the second operating plate 38. The first operating shaft 22, the second operating shaft 24, and the third operating shaft 37 are arranged parallel to one another. In addition, the first operating shaft 22, the second operating shaft 24, and the third operating shaft 37 are arranged parallel to one another.
The operating shaft 37 is disposed in an inverted triangular shape in a side view.

As shown in Figures 18 and 19, the positional relationship of the first and second operating shafts 22 and 24 relative to the first operating plate 23 and the positional relationship of the connecting rod 25 relative to the first operating plate 23 are different between one side (left side) and the other side (right side) of the body 2. Specifically, as shown in Figure 18, on one side (left side) of the body 2, the first operating shaft 22 is connected to the lower part of the first operating plate 23, and the second operating shaft 24 is connected to the upper part of the first operating plate 23. In addition, the connecting rod 25 is connected to the upper part of the first operating plate 23. As shown in Figure 19, on the other side (right side) of the body 2, the first operating shaft 22 is connected to the upper part of the first operating plate 23, and the second operating shaft 24 is connected to the lower part of the first operating plate 23. In addition, the connecting rod 25 is connected to the lower part of the first operating plate 23.

Therefore, the direction of movement of the first operating plate 23 and the connecting rod 25 associated with the extension and contraction of the oscillating cylinder 36 differs between one side and the other side of the machine body 2. Specifically, when the oscillating cylinder 36 is shortened, as shown in FIG. 18, on one side of the machine body 2, the upper part of the first operating plate 23 rotates backward (see arrow X7), and the connecting rod 25 moves backward (see arrow X2). Therefore, the cylinder 28 rotates together with the connecting plate 27 in the direction of arrow X3. On the other hand, on the other side of the machine body 2, as shown in FIG. 19, the lower part of the first operating plate 23 rotates forward (see arrow X8), and the connecting rod 25 moves forward (see arrow X9). Therefore, the cylinder 28 rotates together with the connecting plate 27 in the direction of arrow X10.

As a result, on one side of the machine body 2, the front wheels 3L, 3R move forward while rising, and the rear wheels 4L, 4R move backward while rising. This increases the fore-aft distance between the front wheels 3L, 3R and the rear wheels 4L, 4R, and the machine body 2 descends relative to the wheels. Meanwhile, on the other side of the machine body 2, the front wheels 3L, 3R move backward while descending, and the rear wheels 4L, 4R move forward while descending. This shortens the fore-aft distance between the front wheels 3L, 3R and the rear wheels 4L, 4R, and the machine body 2 ascends relative to the wheels. As a result, the height of the machine body 2 from the planting surface becomes lower on one side of the machine body 2 and higher on the other side.

In addition, when the swing cylinder 36 is extended, the movement of one side and the other side of the machine body 2 is opposite to that when the swing cylinder 36 is shortened. Therefore, the height of the machine body 2 from the planting surface becomes higher on one side of the machine body 2 and lower on the other side.
In this way, the balance between the height of the left side of the vehicle body 2 from the ground and the height of the right side of the vehicle body 2 from the ground changes due to the extension and contraction of the swing cylinder 36. In other words, the vehicle body 2 swings around an axis in the fore-and-aft direction due to the extension and contraction of the swing cylinder 36.

In the above-described embodiment, the left part of the machine body 2 rises and the right part falls as the oscillating cylinder 36 extends, and the right part of the machine body 2 rises and the left part falls as the oscillating cylinder 36 contracts. However, the left part of the machine body 2 may rise and the right part falls as the oscillating cylinder 36 contracts, and the right part of the machine body 2 may rise and the left part falls as the oscillating cylinder 36 extends.

The rocking mechanism rocks the machine body 2 around the axis in the front-rear direction so as to reduce the difference in height from the planting surface between the left and right parts of the machine body 2. In other words, the rocking mechanism rocks the machine body 2 around the axis in the front-rear direction in a direction that reduces the difference in height between the planting tool 80 of the first planting device 20L from the planting surface and the planting tool 80 of the second planting device 20R from the planting surface. This makes it possible to maintain the same height for the planting tool 80 of the first planting device 20L and the planting tool 80 of the second planting device 20R from the planting surface even when the planting surface is inclined (the heights of the left and right parts of the planting surface are different), making it possible to keep the planting depth of the seedlings constant.

The configurations of the lifting mechanism and the swinging mechanism will be described in more detail below.
20, 21 and 22 show the main parts of the machine control mechanism including the lifting mechanism and the swinging mechanism.
The lifting mechanism includes the lifting cylinder 14 described above, a fulcrum shaft 180, a first moving member 181, a second moving member 182, a connecting member 183, a horizontal shaft 184, and a lifting cylinder drive mechanism 185. The swing mechanism includes the swing cylinder 36 described above, a fulcrum shaft 180, a first moving member 181, a second moving member 182, a connecting member 183, and a swing cylinder drive mechanism 186.

The fulcrum shaft 180 extends in the up-down direction. The fulcrum shaft 180 is provided penetrating the inside of a cylindrical body 187. The cylindrical body 187 is rotatable around the axis of the fulcrum shaft 180. A horizontal shaft 184 extending in the width direction of the aircraft is fixed to the lower end of the fulcrum shaft 180. The fulcrum shaft 180 is capable of tilting with the horizontal shaft 184 as a fulcrum. Specifically, the fulcrum shaft 180 is capable of tilting forward (movement in which an upper part of the fulcrum shaft 180 moves forward) and tilting backward (movement in which an upper part of the fulcrum shaft 180 moves backward) with the horizontal shaft 184 as a fulcrum.

A connecting member 183 is fixed to the outer peripheral surface of the cylindrical body 187. The connecting member 183 is fixed to the outer peripheral surface of the cylindrical body 187 via a plate 189. The plate 189 is fixed to the outer peripheral surface of the cylindrical body 187, and the connecting member 183 is fixed to the surface of the plate 189. However, the connecting member 183 may be fixed directly to the outer peripheral surface of the cylindrical body 187. The connecting member 183 extends in the width direction of the aircraft (left and right direction), and the center of the connecting member 183 in the width direction of the aircraft is fixed to the cylindrical body 187.

The connecting member 183 can swing around the fulcrum axis 180. Specifically, when the cylindrical body 187 rotates in one direction around the fulcrum axis 180, the connecting member 183 rotates together with the cylindrical body 187 in one direction around the fulcrum axis 180 (see arrow Y1 in FIG. 22), and when the cylindrical body 187 rotates in the other direction around the fulcrum axis 180, the connecting member 183 rotates together with the cylindrical body 187 in the other direction around the fulcrum axis 180 (see arrow Y2 in FIG. 22). In other words, the connecting member 183 can swing like a seesaw with the fulcrum axis 180 as the fulcrum.

The connecting member 183 is fixed to the upper part of the cylindrical body 187, and is located above the horizontal shaft 184. When the fulcrum shaft 180 tilts forward about the horizontal shaft 184, the connecting member 183 moves forward in association with this movement. Also, when the fulcrum shaft 180 tilts backward about the horizontal shaft 184, the connecting member 183 moves rearward in association with this movement.
The first moving member 181 is disposed on the left side of the fulcrum shaft 180. The second moving member 182 is disposed on the right side of the fulcrum shaft 180. The first moving member 181 and the second moving member 182 are disposed parallel to each other and extend in the front-rear direction. The first moving member 181 and the second moving member 182 are connected by a connecting member 183. The connecting member 183 connects the rear part of the first moving member 181 and the rear part of the second moving member 182.

The front of the first moving member 181 and the rear of the second moving member 182 are connected by a first tension spring 190. The rear of the first moving member 181 and the front of the second moving member 182 are connected by a second tension spring 191. The first tension spring 190 and the second tension spring 191 apply tension to the first moving member 181 and the second moving member 182 so that the first moving member 181 and the second moving member 182 are in the same position in the front-to-rear direction. The first moving member 181 and the second moving member 182 are in the same position in the front-to-rear direction when they are not moving (initial state). The first tension spring 190 and the second tension spring 191 apply a force to return the first moving member 181 and the second moving member 182 to their initial positions.

The first moving member 181 moves with the movement of the first movable shaft 65L, which is connected to the first ground contact wheel (first suppression wheel) 100L in an interlocking manner. The second moving member 182 moves with the movement of the second movable shaft 65R, which is connected to the second ground contact wheel (second suppression wheel) 100R in an interlocking manner. The first moving member 181 moves with the movement (oscillation) of the first movable shaft 65L. The second moving member 182 moves with the movement (oscillation) of the second movable shaft 65R.

As shown in Figures 8 and 16, the first ground contact wheel 100L and the first movable shaft 65L are connected via a first interlocking body 192L. The first interlocking body 192L is composed of a part of the first linkage mechanism 200L described above, a first bracket 101L, and a first support body 21L. Specifically, the first interlocking body 192L is composed of an upper member 201L, a lower member 202L, an intermediate member 203L, a first bracket 101L, and a first support body 21L.

As shown in FIG. 8, the second ground contact wheel 100R and the second movable shaft 65R are connected via the second interlocking body 192R. The second interlocking body 192R is composed of a part of the second linkage mechanism 200R described above, the second bracket 101R, and the second support body 21R. Specifically, the second interlocking body 192R is composed of the upper member 201R, the lower member 202R, the intermediate member 203R, the second bracket 101R, and the second support body 21R.

As shown in FIGS. 20, 21, 22, etc., the front part of the first moving member 181 is connected to the first pivot shaft 19.
A front portion of the second moving member 182 is pivotally supported to the other mounting portion 204Lb of the first plate 204L via a second pivot shaft 193R.
With the above configuration, when the first ground contact wheel 100L moves up and down, the first plate 204L and the first movable shaft 65L swing about the pivot 205 as a fulcrum, and the first moving member 181 moves in the front-to-rear direction. When the second ground contact wheel 100R moves up and down, the second plate 204R and the second movable shaft 65R swing about the pivot 205 as a fulcrum, and the second moving member 182 moves in the front-to-rear direction.

The first moving member 181 moves forward when the first ground contact wheel 100L rises, and moves backward when the first ground contact wheel 100L descends. The second moving member 182 moves forward when the second ground contact wheel 100R rises, and moves backward when the second ground contact wheel 100R descends. The first moving member 181 moves in the front-to-rear direction based on a first fluctuation amount, which is the amount of fluctuation in the height of the first ground contact wheel 100L. The second moving member 182 moves in the front-to-rear direction based on a second fluctuation amount, which is the amount of fluctuation in the height of the second ground contact wheel 100R.

The connecting member 183 swings around the fulcrum shaft 180 (see Figures 21, 22, 20, etc.) based on the difference between the first movement amount, which is the movement amount of the first moving member 181, and the second movement amount, which is the movement amount of the second moving member 182 (see arrows Y1 and Y2 in Figure 22). The fulcrum shaft 180 tilts with the horizontal axis 184 as the fulcrum, based on the average value of the first movement amount and the second movement amount. These operations are described below.

When the first fluctuation amount, which is the fluctuation amount of the height of the first grounding wheel 100L, is larger than the second fluctuation amount, which is the fluctuation amount of the height of the second grounding wheel 100R (for example, when the rise amount of the first grounding wheel 100L is larger than the rise amount of the second grounding wheel 100R), the first movement amount D1, which is the movement amount of the first moving member 181, becomes larger than the second movement amount D2, which is the movement amount of the second moving member 182. In this case, the connecting member 183 rotates in one direction around the fulcrum axis 180 based on the difference between the first movement amount and the second movement amount (first movement amount - second movement amount) (see arrow Y2 in Figure 26). Specifically, the connecting member 183 rotates by an angle based on the difference in the movement amount because the first moving member 181 side (left side), which is the side with the larger movement amount of the first movement amount and the second movement amount, moves more than the second moving member 182 side (right side), which is the side with the smaller movement amount. As shown by arrow Z1 in FIG. 26 and arrow Z2 in FIG. 27, the fulcrum shaft 180 tilts around the horizontal axis 184 as a fulcrum based on the average value of the first and second movement amounts. FIG. 28 shows the relationship between the first movement amount D1, the second movement amount D2, and the tilt amount D3 of the fulcrum shaft 180. For example, when the first movement amount D1 is 20 mm and the second movement amount D2 is 10 mm, the tilt amount D3 of the fulcrum shaft 180 is (10 + 20)/2 = 15 mm. The rotation amount (angle of rotation) of the connecting member 183 is based on the difference (D2 - D1) between the first and second movement amounts.

When the second amount of change, which is the amount of change in the height of the second grounding wheel 100R, is greater than the first amount of change, which is the amount of change in the height of the first grounding wheel 100L (for example, when the amount of rise of the second grounding wheel 100R is greater than the amount of rise of the first grounding wheel 100L), the second amount of movement D2 becomes greater than the first amount of movement D1. In this case, the connecting member 183 rotates to the other side around the fulcrum shaft 180 based on the difference between the first amount of movement D1 and the second amount of movement D2 (second amount of movement - first amount of movement) (see arrow Y1 in FIG. 29). Specifically, the connecting member 183 rotates by an angle based on the difference in the amount of movement, since the second moving member 182 side (right side), which is the side with the larger amount of movement of the first moving member 182 side (left side), moves more than the first moving member 181 side (left side), which is the side with the smaller amount of movement. Additionally, as indicated by arrow Z2 in FIG. 29 and arrow Z2 in FIG. 27, the fulcrum shaft 180 tilts with the horizontal shaft 184 as the fulcrum based on the average value of the first movement amount and the second movement amount.

When there is no difference between the first movement amount D1 and the second movement amount D2 (for example, when the amount of rise of the second ground contact wheel 100R is the same as the amount of rise of the first ground contact wheel 100L), as shown in FIG. 30, the connecting member 183 does not rotate around the fulcrum shaft 180. Also, as shown by arrow Z3 in FIG. 30 and arrow Z2 in FIG. 27, the fulcrum shaft 180 tilts around the horizontal axis 184 as a fulcrum based on the average value (= D1, D2) of the first movement amount D1 and the second movement amount D2.

As shown in Figures 26, 27, 29, and 30, when the moving directions of the first moving member 181 and the second moving member 182 are both forward, the connecting member 183 moves forward,
The fulcrum shaft 180 tilts forward with the horizontal shaft 184 as a fulcrum. On the other hand, as shown in Figures 31 and 32, when the moving directions of the first moving member 181 and the second moving member 182 are both rearward, the connecting member 183 moves rearward (see arrow Z4), and the fulcrum shaft 180 tilts rearward with the horizontal shaft 184 as a fulcrum (see arrow Z5). In this way, when the moving directions of the first moving member 181 and the second moving member 182 are the same, the connecting member 183 moves forward or rearward, which is the same direction as the moving directions of the first moving member 181 and the second moving member 182, and the fulcrum shaft 180 tilts in the same direction with the horizontal shaft 184 as a fulcrum.

As shown in FIG. 33, when the movement direction of the first moving member 181 and the movement direction of the second moving member 182 are different and there is no difference between the first movement amount D1 and the second movement amount D2 (for example, when the first moving member 181 moves forward 20 mm and the second moving member 182 moves backward 20 mm), the connecting member 183 does not move forward or backward, but swings around the fulcrum shaft 180 in place (see arrow Y1). In this case, the fulcrum shaft 180 does not tilt.

As shown in FIG. 34, when the movement direction of the first moving member 181 and the movement direction of the second moving member 182 are different and there is a difference between the first movement amount D1 and the second movement amount D2, the connecting member 183 moves forward or backward based on the difference between the first movement amount D1 and the second movement amount D2, and the fulcrum shaft 180 tilts with the horizontal shaft 184 as a fulcrum. Specifically, the connecting member 183 moves in the movement direction with the larger absolute value of the movement amount (see arrow Z6 in FIG. 34), and the fulcrum shaft 180 tilts in the movement direction with the larger absolute value of the movement amount (see arrow Z2 in FIG. 27). For example, when the first moving member 181 moves forward 20 mm and the second moving member 182 moves backward 10 mm, the connecting member 183 moves forward and the fulcrum shaft 180 tilts forward.

In this case, the connecting member 183 rotates around the fulcrum axis 180 based on the difference between the first movement amount D1 and the second movement amount D2 (see arrow Y1 in FIG. 34). In this case, the first movement amount D1 and the second movement amount D2 are movement amounts in opposite directions, so when calculating the difference between the first movement amount D1 and the second movement amount D2, they are treated as values with opposite positive and negative values. For example, if the first moving member 181 moves forward 20 mm and the second moving member 182 moves backward 10 mm, the difference in the movement amounts is calculated as 20 - (-10) = 30, and the connecting member 183 rotates by an angle based on this difference in the movement amounts.

As shown in Figures 20, 21, 22, 35, etc., the swing cylinder drive mechanism 186 includes the horizontal shaft 184, a first rotating member 194L, a second rotating member 194R, a first wire 195L, a second wire 195R, a lever 196, and a first interlocking mechanism 197. The lift cylinder drive mechanism 185 includes a rotating body 198, a first rotating member 194L, a second rotating member 194R, and a second interlocking mechanism 199. The swing cylinder drive mechanism 186 and the lift cylinder drive mechanism 185 share some of the same components (parts).

The first rotating member 194L and the second rotating member 194R have the same shape and are arranged parallel to each other with a gap in the aircraft width direction. The first rotating member 194L is connected to the left part of the connecting member 183. The second rotating member 194R is connected to the right part of the connecting member 183. The horizontal shaft 184 passes through the first rotating member 194L and the second rotating member 194R. The first rotating member 194L and the second rotating member 194R are approximately V-shaped in side view. The first rotating member 194L and the second rotating member 194R have a front part 194a that extends diagonally upward and forward from the part where the horizontal shaft 184 passes through, and a rear part 194b that extends diagonally upward and rearward from the part where the horizontal shaft 184 passes through.

One end of the first wire 195L is connected to the front portion 194a of the first rotating member 194L via a connector 175L. One end of the second wire 195R is connected to the front portion 194a of the second rotating member 194R via a connector 175R. The first wire 195L and the second wire 195R are composed of an outer wire (not shown) and an inner wire. The inner wire passes through the inside of the outer wire. The outer wire is fixed so as not to move, and the inner wire can slide and move relative to the outer wire. One end of the inner wire is fixed to the connectors 175L and 175R.

As shown in FIG. 21, a first long hole 194c is formed in a rear portion 194b of the first rotating member 194L, and the left portion of the connecting member 183 is inserted into the first long hole 194c to connect the first rotating member 194L to the rear portion 194b.
4b. A second long hole 194d is formed in the rear portion 194b of the second rotating member 194R, and the right portion of the connecting member 183 is inserted into the second long hole 194d and connected to the rear portion 194b. The left portion of the connecting member 183 can move within the range of the first long hole 194c. The right portion of the connecting member 183 can move within the range of the second long hole 194d. This prevents the connecting member 183 from being twisted with the first rotating member 194L or the second rotating member 194R when the moving members 181, 182 move with the connecting member 183 rotated around the fulcrum shaft 180 (diagonal state).

The first rotating member 194L and the second rotating member 194R are each capable of rotating around the horizontal axis 184. The first rotating member 194L rotates around the horizontal axis 184 due to the movement of the left part of the connecting member 183 accompanying the movement of the first moving member 181. The first rotating member 194L rotates around the horizontal axis 184 based on a first movement amount, which is the movement amount of the first moving member 181. The second rotating member 194R rotates around the horizontal axis 184 due to the movement of the right part of the connecting member 183 accompanying the movement of the second moving member 182. The second rotating member 194R rotates around the horizontal axis 184 based on a second movement amount, which is the movement amount of the second moving member 182.

The first wire 195L (more specifically, the inner wire of the first wire 195L) moves in conjunction with the rotation of the first rotating member 194L. The first wire 195L moves based on the amount of rotation of the first rotating member 194L. The amount of movement of the first wire 195L is large when the amount of rotation of the first rotating member 194L is large, and is small when the amount of rotation of the first rotating member 194L is small. The amount of movement of the first wire 195L is large when the amount of movement of the first moving member 181 is large, and is small when the amount of movement of the first moving member 181 is small.

The second wire 195R (more specifically, the inner wire of the second wire 195R) moves in conjunction with the rotation of the second rotating member 194R. The second wire 195R moves based on the amount of rotation of the second rotating member 194R. The amount of movement of the second wire 195R is large when the amount of rotation of the second rotating member 194R is large, and is small when the amount of rotation of the second rotating member 194R is small. The amount of movement of the second wire 195R is large when the amount of movement of the second moving member 182 is large, and is small when the amount of movement of the second moving member 182 is small.

The rotating body 198 is connected to the spool of the lift control valve (not shown). The rotating body 198 is connected to the first rotating member 194L and the second rotating member 194R via a second interlocking mechanism 199. The second interlocking mechanism 199 is a mechanism that rotates the rotating body 198 in conjunction with the rotation of the first rotating member 194L and the second rotating member 194R. The second interlocking mechanism 199 rotates the rotating body 198 based on the average value of the rotation amount of the first rotating member 194L and the rotation amount of the second rotating member 194R. The rotation amount of the first rotating member 194L is determined based on the movement amount of the first moving member 181, and the rotation amount of the second rotating member 194R is determined based on the movement amount of the second moving member 182. Therefore, the second interlocking mechanism 199 rotates the rotating body 198 based on the average value of the movement amount of the first moving member 181 and the movement amount of the second moving member 182.

The second interlocking mechanism 199 has a horizontal shaft 184, a front rod 178, and a rear rod 179. A front end of the front rod 178 is connected to one end (left end) of the horizontal shaft 184. A rear end of the front rod 178 is pivotally supported relative to a front end of the rear rod 179 via a front pivot shaft 177. A rear end of the rear rod 179 is connected to a rotating body 198 via a rear pivot shaft 176.
The rotating body 198 can rotate in a first direction (the direction of the arrow H1 in FIG. 20) and a second direction (the direction of the arrow H2 in FIG. 20) with a connection part 198a connected to the spool of the lift control valve as a fulcrum. By rotating the rotating body 198, the spool of the lift control valve can be operated to extend and retract the lift cylinder 14. Specifically, when the rotating body 198 rotates in the first direction, the lift cylinder 14 extends, and when the rotating body 198 rotates in the second direction, the lift cylinder 14 contracts. However, if necessary, the lift cylinder 14 may be configured so that when the rotating body 198 rotates in the second direction, the lift cylinder 14 extends, and when the rotating body 198 rotates in the first direction, the lift cylinder 14 contracts.

The rotating body 198 rotates due to the tilt of the fulcrum shaft 180. When the fulcrum shaft 180 tilts due to the above-mentioned action, the horizontal shaft 184 rotates around the central axis of the horizontal shaft 184 (around the axis in the aircraft width direction). More specifically, when the fulcrum shaft 180 tilts forward, the horizontal shaft 184 rotates in the direction of the arrow S1. This rotation is transmitted to the rotating body 198 via the front rod 178 and the rear rod 179, and the rotating body 198 rotates in the second direction H2. When the fulcrum shaft 180 tilts rearward, the horizontal shaft 184 rotates in the direction of the arrow S2. This rotation is transmitted to the rotating body 198 via the front rod 178 and the rear rod 179, and the rotating body 198 rotates in the first direction H1.

As described above, the fulcrum shaft 180 tilts forward when the first moving member 181 and the second moving member 182 both move forward, or when the first moving member 181 and the second moving member 182 move in different directions and the amount of forward movement is greater than the amount of backward movement. The forward movement of the first moving member 181 and the second moving member 182 occurs when the ground wheel 100 that touches the planting surface rises, so the forward tilt of the fulcrum shaft 180 occurs when the machine body 2 as a whole descends relative to the planting surface. The meaning of "descending as a whole" includes the case where the left and right parts of the machine body 2 both descend and the case where the amount of descent of one side of the machine body 2 is greater than the amount of rise of the other side.

The fulcrum shaft 180 tilts backward when the first moving member 181 and the second moving member 182 both move backward, or when the first moving member 181 and the second moving member 182 move in different directions and the amount of backward movement is greater than the amount of forward movement. The backward movement of the first moving member 181 and the second moving member 182 occurs when the ground wheel 100 that touches the planting surface descends, so the backward tilt of the fulcrum shaft 180 occurs when the machine body 2 rises as a whole relative to the planting surface. The meaning of "rising as a whole" includes the case where both the left and right parts of the machine body 2 rise, and the case where the amount of rise on one side of the machine body 2 is greater than the amount of fall on the other side.

When the machine body 2 as a whole descends relative to the planting surface (when the fulcrum shaft 180 tilts forward), the rotating body 198 rotates in the second direction H2, shortening the lifting cylinder 14 and allowing the machine body 2 to rise. On the other hand, when the machine body 2 as a whole rises relative to the planting surface (when the fulcrum shaft 180 tilts backward), the rotating body 198 rotates in the first direction H1, extending the lifting cylinder 14 and allowing the machine body 2 to fall. This allows the height of the machine body 2 above the planting surface to be maintained constant.

The lift cylinder 14 is configured to operate when the average value of the first movement amount, which is the movement amount of the first moving member 181, and the second movement amount, which is the movement amount of the second moving member 182, becomes equal to or greater than a predetermined value. Therefore, when the average value of the first movement amount and the second movement amount becomes equal to or greater than a predetermined value, the lift cylinder 14 operates and the machine body 2 rises or falls.
As shown in FIG. 1 and FIG. 36, the lever 196 is disposed in front of the chair 11. More specifically, the lever 196 is disposed in front of the chair 11 and behind the seedling supply unit 9. As shown by the arrows W1 and W2 in FIG. 35, the lever 196 can be swung in a first direction (forward) and a second direction (backward). The lower end of the lever 196 is connected to the spool of the swing control valve (not shown) described above. By swinging the lever 196, the spool of the swing control valve can be operated to extend and retract the swing cylinder 36. Specifically, when the lever 196 is swung in the first direction, the swing cylinder 36 extends, and when the lever 196 is swung in the second direction, the swing cylinder 36 shortens.

The first interlocking mechanism 197 is a mechanism that interlocks the movement of the first wire 195L and the second wire 195R with the swing of the lever 196. The first interlocking mechanism 197 swings the lever 196 in a first direction when the movement amount of the first wire 195L is greater than the movement amount of the second wire 195R, swings the lever 196 in a second direction when the movement amount of the second wire 195R is greater than the movement amount of the first wire 195L, and does not swing the lever 196 when the movement amount of the first wire 195L and the movement amount of the second wire 195R are the same.

When the height of the left part of the planting surface where the first grounding wheel 100L is in contact with the ground becomes higher than the height of the right part of the planting surface where the second grounding wheel 100R is in contact with the ground, the amount of rise of the first grounding wheel 100L becomes larger than the amount of rise of the second grounding wheel 100R, and the first amount of change in the height of the first grounding wheel 100L becomes larger than the second amount of change in the height of the second grounding wheel 100R. In this case, the amount of movement of the first wire 195L becomes larger than the amount of movement of the second wire 195R, so the lever 196 swings in the first direction. This causes the swing cylinder 36 to extend, and the left part of the machine body 2 becomes higher and the right part becomes lower. As a result, the difference in height from the planting surface between the left and right parts of the machine body 2 decreases, so that the height of the first planting device 20L from the planting surface and the height of the second planting device 20R from the planting surface can be made approximately the same.

When the height of the right part of the planting surface where the second grounding wheel 100R is in contact with the ground becomes higher than the height of the left part of the planting surface where the first grounding wheel 100L is in contact with the ground, the amount of lift of the second grounding wheel 100R becomes greater than the amount of lift of the first grounding wheel 100L, and the second amount of movement becomes greater than the first amount of movement. In this case, the amount of movement of the second wire 195R becomes greater than the amount of movement of the first wire 195L, so the lever 196 swings in the second direction. This shortens the swing cylinder 36, and the right part of the machine body 2 becomes higher and the left part becomes lower. As a result, the difference in height from the planting surface between the left and right parts of the machine body 2 decreases, so that the height of the first planting device 20L from the planting surface and the height of the second planting device 20R from the planting surface can be made approximately the same.

The configuration of the first interlocking mechanism 197 will now be described in detail.
As shown in FIGS. 35, 37, 38, 39, and 40, the first interlocking mechanism 197 has a base body 210, a cover body 211, a connecting body 212, and an operating portion 213.
The base body 210 has a base plate 210a, a first extension portion 210b, a second extension portion 210c, and a third extension portion 210d. The first extension portion 210b extends from the lower portion of the base plate 210a toward the cover body 211 side (left side). The second extension portion 210c extends from the front lower portion of the base plate 210a toward the cover body 211 side. The third extension portion 210d extends from the rear lower portion of the base plate 210a toward the cover body 211 side. A first upper extension portion 210e and a second upper extension portion 210f are provided on the upper portion of the base plate 210a. The first upper extension portion 210e extends upward at the front portion of the base plate 210a. The second upper extension portion 210f extends upward at the rear portion of the base plate 210a. An upper portion of the first upper extension portion 210e and an upper portion of the second upper extension portion 210f are connected by a connector 212.

The cover body 211 has a cover plate 211a, a front extension 211b, and a rear extension 211c. The cover plate 211a is disposed facing the base plate 210a with a gap between them. The front extension 211b extends from the front lower part of the cover plate 211a toward the base body 210 (right side) and is attached to the first extension 210b. The rear extension 211c extends from the rear lower part of the cover plate 211a toward the base body 210 and is attached to the second extension 210c. An opening 211d is formed in the upper part of the cover plate 211a.

The operating unit 213 is disposed in a space formed between the base body 210 and the cover body 211. The operating unit 213 has a first disk 221, a second disk 222, a third disk 223, a fourth disk 224, and a through shaft 225. The first disk 221, the second disk 222, the third disk 223, and the fourth disk 224 are arranged parallel to each other in the width direction of the aircraft. The first disk 221, the second disk 222, the third disk 223, and the fourth disk 224 are arranged in the order of the first disk 221, the second disk 222, the third disk 223, and the fourth disk 224 from the side closest to the cover plate 211a. A through shaft 225 extending in the width direction of the aircraft passes through the center of the first disk 221, the second disk 222, the third disk 223, and the fourth disk 224. One end of the through shaft 225 is disposed within the opening 211d. The other end of the through shaft 225 is disposed between the first upper extension 210e and the second upper extension 210f.

The actuator 213 has a first cylinder 226, a second cylinder 227, a tension spring 228, a first actuator 229, a second actuator 230, a third actuator 231, a fourth actuator 232, a fifth actuator 233, and a sixth actuator 234. The first cylinder 226 and the second cylinder 227 are composed of bearings, for example. The first cylinder 226 is disposed between the first disc 221 and the second disc 222. The second cylinder 227 is disposed between the third disc 223 and the fourth disc 224. The first cylinder 226 and the second cylinder 227 are fitted onto the outer periphery of the through shaft 225.

An upper end of the tension spring 228 is engaged with the through shaft 225. A lower end of the tension spring 228 is engaged with a locking hole 210g provided in the first extending portion 210b. The tension spring 228 pulls the through shaft 225 downward.
The first actuating body 229 and the second actuating body 230 are disposed on one end side of the through shaft 225. The third actuating body 231 and the fourth actuating body 232 are disposed on the other end side of the through shaft 225. The first actuating body 229 and the second actuating body 230 are disposed so as to intersect with each other in the middle.
The actuator 231 and the fourth actuator 232 are also disposed so as to intersect with each other midway. A first cylinder 226 is placed on the portion where the first actuator 229 and the second actuator 230 intersect. A second cylinder 227 is placed on the portion where the third actuator 231 and the fourth actuator 232 intersect. The tension spring 228 presses the first cylinder 226 and the second cylinder 227 against the above-mentioned intersecting portions by pulling the through shaft 225 downward.

The fifth actuator 233 is disposed in front of the through shaft 225 between the first actuator 229 and the second actuator 230 and the third actuator 231 and the fourth actuator 232. The sixth actuator 234 is disposed in the rear of the through shaft 225 between the first actuator 229 and the second actuator 230 and the third actuator 231 and the fourth actuator 232. The first actuator 229 and the third actuator 231 (hereinafter referred to as "one pair 229A") are positioned to overlap in the side view direction (perpendicular to the paper surface of FIG. 35) and move in the same manner in synchronization. The second actuator 230 and the fourth actuator 232 (hereinafter referred to as "the other pair 230A") are positioned to overlap in the side view direction and move in the same manner in synchronization.

A front portion of one pair 229A (first acting body 229, third acting body 231) is connected to an outer circumferential surface of a front shaft 235. A rear portion of the other pair 230A (second acting body 230, fourth acting body 232) is connected to an outer circumferential surface of a rear shaft 236. The front shaft 235 and the rear shaft 236 extend in the width direction of the aircraft, parallel to each other, with a gap between them in the fore-and-aft direction.
The front shaft 235 has one end connected to the front part of the base plate 210a and the other end connected to the front part of the cover plate 211a. The rear shaft 236 has one end connected to the rear part of the base plate 210a and the other end connected to the rear part of the cover plate 211a.

The fifth actuator 233 has a lower portion connected to the outer circumferential surface of the front shaft 235 and extends upward from the front shaft 235. The other end of the first wire 195L (more specifically, the inner wire of the first wire 195L) is connected to the upper portion of the fifth actuator 233 via a first connector 237. The sixth actuator 234 has a lower portion connected to the outer circumferential surface of the rear shaft 236 and extends upward from the rear shaft 236. The other end of the second wire 195R (more specifically, the inner wire of the second wire 195R) is connected to the upper portion of the sixth actuator 234 via a second connector 238. The second connector 238 is omitted in Figures 38, 39, and 40.

On the opposite side (right side) of the base body 210 from the cover body 211, the lever 196 and the switching member 240 are arranged. The switching member 240 constitutes a part of the switching mechanism described later. The switching member 240 has a horizontally long hole 240a extending in the width direction of the machine body and a vertically long hole 240b extending in the up-down direction. The shaft portion of the knob bolt 241 is inserted into the horizontally long hole 240a. An extension portion 196a extending toward the base body 210 side is formed in the middle of the length of the lever 196. A through hole through which the shaft portion of the knob bolt 241 is inserted is formed in the extension portion 196a, and a nut NT2 having a screw hole concentric with the through hole is fixed. The lever 196 and the switching member 240 are fixed by screwing the shaft portion 241a of the knob bolt 241 into the nut NT2 and tightening it. By loosening the knob bolt 241, the lever 196 and the switching member 240 are released from their fixed position.

As shown by arrow V1 in FIG. 38, the switching member 240 can move in the width direction of the machine body. The switching member 240 can be moved by releasing the fixation between the lever 196 and the switching member 240. When the switching member 240 moves toward the cover body 211, the other end of the through shaft 225 is inserted into the vertically long hole 240b. When the switching member 240 moves toward the opposite side to the cover body 211 (in the direction away from the cover body 211), the other end of the through shaft 225 comes out of the vertically long hole 240b.

The first interlocking mechanism 197 swings the lever 196 in a first direction when the amount of movement of the first wire 195L is greater than the amount of movement of the second wire 195R, swings the lever 196 in a second direction when the amount of movement of the second wire 195R is greater than the amount of movement of the first wire 195L, and does not swing the lever 196 when the amount of movement of the first wire 195L and the amount of movement of the second wire 195R are the same.

The operation of the first interlocking mechanism 197 will now be described in more detail.
As shown by arrow N1 in Fig. 41, when the first connector 237 is pulled forward, one pair 229A (first actuating body 229, third actuating body 231) rotates about the front shaft 235 and the rear part rises. Also, as shown by arrow N2 in Fig. 42, when the second connector 238 is pulled rearward, the other pair 230A (second actuating body 230, fourth actuating body 232) rotates about the rear shaft 236 and the front part rises.

When the amount of movement (pulling amount) of the first wire 195L is greater than the amount of movement (pulling amount) of the second wire 195R, the amount by which the first connector 237 is pulled forward is greater than the amount by which the second connector 238 is pulled backward. Therefore, as shown in FIG. 41, the rear of the first pair 229A (first actuator 229, third actuator 231) is positioned higher than the front of the other pair 230A (second actuator 230, fourth actuator 232), the first cylinder 226 and the second cylinder 227 move forward, and the through shaft 225 also moves forward. As a result, the through shaft 225 pushes the edge of the vertically long hole 240b forward, so the lever 196 swings in the first direction (forward) and the swing cylinder 36 extends.

When the amount of movement (pulling amount) of the second wire 195R is greater than the amount of movement (pulling amount) of the first wire 195L, the amount by which the second connector 238 is pulled backward is greater than the amount by which the first connector 237 is pulled forward. Therefore, as shown in FIG. 42, the front of the other pair 230A (second actuator 230, fourth actuator 232) is positioned higher than the rear of the one pair 229A (first actuator 229, third actuator 231), the first cylinder 226 and the second cylinder 227 move backward, and the through shaft 225 also moves backward. As a result, the through shaft 225 pushes the edge of the vertically long hole 240b backward, so the lever 196 swings in the second direction (backward), and the swing cylinder 36 shortens.

As shown in FIG. 43, when the movement amount (pulling amount) of the first wire 195L and the movement amount (pulling amount) of the second wire 195R are the same, the amount by which the first connector 237 is pulled forward is the same as the amount by which the second connector 238 is pulled backward. In this case, the first pair 229A (first actuator 229, second actuator 230) and the other pair 230A (second actuator 230, third actuator 231) move vertically upward as they are. As a result, the first cylinder 226 and the second cylinder 227 also move vertically upward (see arrow N3), and the through shaft 225 also moves vertically upward. Then, the through shaft 225 moves vertically upward along the vertical elongated hole 240b, so that the through shaft 225 does not push the edge of the vertical elongated hole 240b forward or backward. Therefore, the movement of the through shaft 225 is not transmitted to the lever 196, the lever 196 does not swing in either the first or second direction, and the swing cylinder 36 does not operate.

The aircraft control mechanism can switch between a linked state in which both the lifting mechanism and the oscillating mechanism are operating, and a non-linked state in which either the lifting mechanism or the oscillating mechanism is operating, based on a first fluctuation amount, which is the amount of fluctuation in the height of the first grounding wheel 100L, and a second fluctuation amount, which is the amount of fluctuation in the height of the second grounding wheel 100R.
The aircraft control mechanism switches to the linked state when there is a difference between the first fluctuation amount and the second fluctuation amount and the average value of the first fluctuation amount and the second fluctuation amount is equal to or greater than a predetermined amount.

When there is a difference between the first movement amount, which is the movement amount of the first moving member 181, and the second movement amount, which is the movement amount of the second moving member 182, a difference occurs between the movement amount of the first wire 195L and the movement amount of the second wire 195R, and the swing mechanism operates (the swing cylinder 36 operates). In this case, when the average value of the first movement amount and the second movement amount becomes equal to or greater than a predetermined value, the lifting mechanism operates (the lifting cylinder 14 operates). In other words, when there is a difference between the first movement amount and the second movement amount and the average value of the first movement amount and the second movement amount becomes equal to or greater than a predetermined value, both the swing mechanism and the lifting mechanism operate in an interlocking state. The first movement amount is determined by the first fluctuation amount, which is the fluctuation amount of the height of the first grounding wheel 100L, and the second movement amount is determined by the second fluctuation amount, which is the fluctuation amount of the height of the second grounding wheel 100R. Therefore, when there is a difference between the first and second fluctuation amounts and the average value of the first and second fluctuation amounts is equal to or greater than a predetermined value, a linked state is reached in which both the rocking mechanism and the lifting mechanism operate.

The unlinked state includes a first unlinked state in which only the lifting mechanism operates, and a second unlinked state in which only the swinging mechanism operates. The aircraft control mechanism switches between the first unlinked state and the second unlinked state based on the first fluctuation amount and the second fluctuation amount.
The aircraft control mechanism switches to the first non-linked state when there is no difference between the first fluctuation amount and the second fluctuation amount and the average value of the first fluctuation amount and the second fluctuation amount is equal to or greater than a predetermined amount.

When there is no difference between the first and second movement amounts, there is no difference between the movement amounts of the first wire 195L and the second wire 195R, and the swing mechanism does not operate (the swing cylinder 36 does not operate). In this case, when the average value of the first and second movement amounts becomes equal to or greater than a predetermined value, the lifting mechanism operates (the lifting cylinder 14 operates). In other words, when there is no difference between the first and second movement amounts and the average value of the first and second movement amounts becomes equal to or greater than a predetermined value, the first non-interlocking state is entered in which only the lifting mechanism operates. The first movement amount is determined by the first fluctuation amount, and the second movement amount is determined by the second fluctuation amount. Therefore, when there is no difference between the first and second fluctuation amounts and the average value of the first and second fluctuation amounts becomes equal to or greater than a predetermined value, the first non-interlocking state is entered in which only the lifting mechanism operates.

The aircraft control mechanism switches to the second non-linked state when there is a difference between the first fluctuation amount and the second fluctuation amount and an average value of the first fluctuation amount and the second fluctuation amount is less than a predetermined amount.
When there is a difference between the first and second movement amounts, a difference occurs between the movement amounts of the first wire 195L and the second wire 195R, and the swing mechanism operates (the swing cylinder 36 operates). In this case, when the average value of the first and second movement amounts is less than a predetermined value, the lifting mechanism does not operate (the lifting cylinder 14 does not operate). In other words, when there is a difference between the first and second movement amounts and the average value of the first and second movement amounts is less than a predetermined value, the second non-interlocking state in which only the swing mechanism operates is established. The first movement amount is determined by the first fluctuation amount, and the second movement amount is determined by the second fluctuation amount. Therefore, when there is a difference between the first and second fluctuation amounts and the average value of the first and second fluctuation amounts is less than a predetermined value, the second non-interlocking state in which only the swing mechanism operates is established.

Next, the switching mechanism will be described.
The switching mechanism is a mechanism for switching between a manual mode in which the lever 196 is manually swung and an automatic mode in which the lever 196 is automatically swung.
The switching mechanism has a switching member 240, a knob bolt 241, and a vertically long hole 240b. When the switching member 240 is moved toward the cover body 211 and the other end of the through shaft 225 is inserted into the vertically long hole 240b, the knob bolt 241 is tightened to fix the lever 196 and the switching member 240, and the automatic mode is selected. When the switching member 240 is moved away from the cover body 211 and the other end of the through shaft 225 is removed from the vertically long hole 240b, the manual mode is selected.

First, the automatic mode will be described.
In the automatic mode, the first interlocking mechanism 197 is allowed to swing the lever 196 .
As described above, the first interlocking mechanism 197 swings the lever 196 in a first direction when the movement amount of the first wire 195L is greater than the movement amount of the second wire 195R, swings the lever 196 in a second direction when the movement amount of the second wire 195R is greater than the movement amount of the first wire 195L, and does not swing the lever 196 when the movement amount of the first wire 195L and the movement amount of the second wire 195R are the same.

Therefore, in the automatic mode, when a first variation amount, which is the variation amount of the height of the first ground contact wheel 100L, is greater than a second variation amount, which is the variation amount of the height of the second ground contact wheel 100R, the lever 196 swings in a first direction, and when the second variation amount is greater than the first variation amount, the lever 196 swings in a second direction. Also, when the first variation amount and the second variation amount are the same, the lever 196 does not swing.
Thus, in the automatic mode, the lever 196 operates based on the first variation amount and the second variation amount.

Next, the manual mode will be described.
In the manual mode, the first interlocking mechanism 197 is not permitted to swing the lever 196 .
As described above, when the switching member 240 is moved to the side opposite the cover body 211 and the other end of the through shaft 225 is removed from the vertically elongated hole 240b, the manual mode is selected.
In the state switched to the manual mode, the through shaft 225 is disengaged from the vertically long hole 240b, so that even if either the first wire 195L or the second wire 195R moves, the movement of the through shaft 225 is not transmitted to the lever 196. Therefore, even if either the first wire 195L or the second wire 195R moves, the lever 196 does not move. Therefore, in the manual mode, even if the first grounding wheel 100L and the second grounding wheel 100R move up and down, the lever 196 does not swing, and the swing cylinder 36 does not operate.

When operating the oscillating cylinder 36 in manual mode, the operator manually oscillates the lever 196. Specifically, if it is desired to raise the left section of the machine body 2 relative to the right section, the lever 196 is oscillated in a first direction. This causes the oscillating cylinder 36 to extend, and the left section of the machine body 2 rises relative to the right section. If it is desired to raise the right section of the machine body 2 relative to the left section, the lever 196 is oscillated in a second direction. This causes the oscillating cylinder 36 to shorten, and the right section of the machine body 2 rises relative to the left section.

As shown in Figures 1, 20, 36, etc., the transplanter 1 is equipped with a setting lever 245 that sets the reference height of the ground contact wheel 100. By setting the reference height of the ground contact wheel 100, the height of the machine body 2 relative to the planting surface (specifically, the height of the first planting device 20L and the second planting device 20R from the planting surface) is set. This makes it possible to set the planting depth of the seedlings relative to the planting surface. When the ground contact wheel 100 rises or falls relative to the reference height, the machine body control mechanism operates the lifting mechanism and/or the swinging mechanism by the above-mentioned action.

As shown in Figures 1 and 36, the setting lever 245 is disposed in front of the chair 11. More specifically, the setting lever 245 is disposed in front of the chair 11 and behind the seedling supply unit 9. The setting lever 245 and the lever 196 are disposed side by side in the width direction of the machine body. The positions of the setting lever 245 and the lever 196 in the width direction of the machine body overlap with the position of the chair 11 in the width direction of the machine body.

As shown in Figures 36 and 44, the setting lever 245 is provided to protrude upward from the cover member 246. The cover member 246 is fixed to the upper part of the machine body 2. The cover member 246 is formed with a slot 246a extending in the front-rear direction. The setting lever 245 protrudes from the slot 246a. The slot 246a is formed with a plurality of lateral grooves 246b extending to one side (right side). The plurality of lateral grooves 246b are provided at intervals in the front-rear direction. The setting lever 245 can swing in the front-rear direction along the slot 246a and can be engaged with any of the lateral grooves 246b. By engaging the setting lever 245 with the lateral groove 246b, the swing position (front-rear position) of the setting lever 245 can be fixed.

As shown in Figures 20, 21, and 44, the lower end 245a of the setting lever 245 is attached to a shaft 247 that extends in the width direction of the aircraft. The position of the shaft 247 is fixed relative to the aircraft 2. The setting lever 245 can swing in the front-rear direction with the shaft 247 as a fulcrum. The shaft 247 and the horizontal shaft 184 are connected by a connecting plate 248. The shaft 247 is attached to the upper part of the connecting plate 248, and the horizontal shaft 184 is attached to the lower part of the connecting plate 248.

An opening 248a is formed in the connecting plate 248. A tension spring 249 is inserted through the opening 248a. One end of the tension spring 249 is engaged with a first locking pin 250. The other end of the tension spring 249 is engaged with a second locking pin 251 protruding from a locking plate 252. The first locking pin 250 is fixed to the upper part of the connecting plate 253. The lower part of the connecting plate 253 is fixed to the outer circumferential surface of the horizontal shaft 184. The tension spring 249 applies a force that rotates the horizontal shaft 184 in the direction of the arrow U1 (see FIG. 24). This applies a force to the ground contact wheel 100 in a downward direction (the direction in which the ground contacts the wheel).

As shown in FIG. 44, the locking plate 252 is connected to the lower part of the operation rod 254. The upper part of the operation rod 254 protrudes upward from the cover member 246. An operation plate 255 is attached to the upper part of the operation rod 254. A handle bar 256 is attached to the operation plate 255. By gripping the handle bar 256 and moving it forward or backward, the operation rod 254 rotates together with the operation plate 255 around the central axis of the operation rod 254. An arc-shaped long hole 255a is formed in the operation plate 255 with the operation rod 254 as the center. A screw shaft of a knob bolt 257 is passed through the long hole 255a, and the screw shaft is screwed into a nut fixed to the back surface of the cover member 246. When the knob bolt 257 is loosened, the operation plate 255 can rotate, and when the knob bolt 257 is tightened, the operation plate 255 cannot rotate.

When the handle bar 256 is moved backward to rotate the operating bar 254, the locking plate 252 rotates and the tension spring 249 extends. When the handle bar 256 is moved forward to rotate the operating bar 254, the locking plate 252 rotates and the tension spring 249 shortens. In FIG. 20, the rotation of the locking plate 252 is shown by solid and phantom lines. In this way, by changing the length of the tension spring 249, the tension force of the tension spring 249 changes, and the downward force applied to the ground contact wheel 100 changes. Therefore, the downward force applied to the ground contact wheel 100 can be adjusted by rotating the handle bar 256.

Figures 23, 24, and 25 show the change in height of the ground contact wheel 100 when the setting lever 245 is swung. Figure 24 shows the setting lever 245 when it is in the reference position, Figure 25 shows the setting lever 245 when it is in a position swung forward from the reference position, and Figure 23 shows the setting lever 245 when it is in a position swung rearward from the reference position.
In the state shown in Fig. 23, the ground wheel 100 that touches the planting surface is in a high position, so the position of the machine body 2 relative to the planting surface is low and the planting depth is deep. In the state shown in Fig. 25, the ground wheel 100 that touches the planting surface is in a low position, so the position of the machine body 2 relative to the planting surface is high and the planting depth is shallow. In the state shown in Fig. 24, the ground wheel 100 that touches the planting surface is at an intermediate height, so the position of the machine body 2 relative to the planting surface is at an intermediate height and the planting depth is intermediate.

When the setting lever 245 is swung backward around the axis 247 as a fulcrum, the connection plate 248 and the horizontal axis 184 rotate around the axis 247 and move forward. As a result, the first rotating member 194L and the second rotating member 194R move forward the same distance, and the connecting member 183 also moves forward. Accordingly, the first moving member 181 and the second moving member 182 move forward the same distance. Then, the first plate 204L and the second plate 204R swing the same distance around the pivot 205, and the other mounting part 204Lb and the other mounting part 204Rb move forward the same distance. As a result, the first grounding wheel 100L and the second grounding wheel 100R rise the same distance.

When the setting lever 245 is swung backward around the axis 247 as a fulcrum, the connection plate 248 and the horizontal axis 184 rotate around the axis 247 and move backward. As a result, the first rotating member 194L and the second rotating member 194R move backward the same distance, and the connecting member 183 also moves backward. Accordingly, the first moving member 181 and the second moving member 182 move backward the same distance. Then, the first plate 204L and the second plate 204R swing the same distance around the pivot 205, and the other mounting part 204Lb and the other mounting part 204Rb move backward the same distance. As a result, the first grounding wheel 100L and the second grounding wheel 100R move down the same distance.

As described above, when the setting lever 245 is swung, the first moving member 181 and the second moving member 182 move the same distance, so that the first grounding wheel 100L and the second grounding wheel 100R can be raised and lowered the same distance (height). This changes the reference height of the grounding wheel 100, and the reference height of the machine body 2 relative to the planting surface can be changed. By fixing the position of the setting lever 245, the reference height of the machine body 2 relative to the planting surface can be set.

<Wheel adjustment mechanism>
The transplanter 1 can be provided with a wheelbase adjustment mechanism for adjusting the distance between the left and right wheels. The wheelbase adjustment mechanism is a mechanism capable of adjusting the distance between the front wheels 3L and 3R and the distance between the rear wheels 4L and 4R.
The wheel spacing adjustment mechanism is a mechanism that can obtain a wheel spacing that can accommodate reciprocating four-row planting in addition to normal two-row planting. Reciprocating four-row planting is a planting method in which a transplanter equipped with two planting devices aligned in the width direction of the machine body is used, and a furrow is sandwiched between the left and right wheels while traveling back and forth along the furrow, planting two rows of seedlings while traveling back and forth in one direction, and planting two rows of seedlings while traveling in the other direction, thereby planting four rows of seedlings in one furrow.

Figures 45 and 46 show a part of the transplanter 1 equipped with a wheelbase adjustment mechanism. Figure 45 shows the wheelbase in a shortened state. Figure 46 shows the wheelbase in a longer state.
The wheelbase adjustment mechanism includes a rear wheelbase adjustment mechanism for adjusting the wheelbase of the rear wheels 4L and 4R, and a front wheelbase adjustment mechanism for adjusting the wheelbase of the front wheels 3L and 3R.
and a front wheelbase adjustment mechanism for adjusting the wheelbase.
First, the rear wheelbase adjustment mechanism will be described.

The rear wheelbase adjustment mechanism includes a first adjustment mechanism 260L provided on one side (left side) in the vehicle width direction, and a second adjustment mechanism 260R provided on the other side (right side) in the vehicle width direction. The first adjustment mechanism 260L is a mechanism that can adjust the position in the vehicle width direction of the rear wheel (one driving wheel) 4L located on one side in the vehicle width direction. The second adjustment mechanism 260R is a mechanism that can adjust the position in the vehicle width direction of the rear wheel (other driving wheel) 4R located on the other side in the vehicle width direction.

45, 46, and 47, the first adjustment mechanism 260L has an outer tube (first outer tube) 261 and an inner tube (first inner tube) 262. The first outer tube 261 corresponds to the left tube 28 shown in FIGS. 17 and 18. The first outer tube 261 and the first inner tube 262 are both hexagonal tubes. The end of the first outer tube 261 on the inside of the vehicle is connected to the transmission case (not shown) via the first connecting tube 263 and the first connecting plate 264. In the figure, the position where the transmission case is located is indicated by the symbol M1. The inside of the vehicle of the first inner tube 262 is inserted into the first outer tube 261 from the outside of the vehicle. The outside of the vehicle of the first inner tube 262 is connected to the upper part of the wheel support 7L. The wheel support 7L houses the first mechanism that transmits power to the rear wheel 4L. The first mechanism is composed of a chain, a sprocket, etc.

47 , a take-off shaft 265 for taking out the power output from the transmission case is inserted into the first inner cylinder 262 and the first outer cylinder 261. In other words, the first inner cylinder 262 and the first outer cylinder 261 are disposed on the outer circumferential side of the take-off shaft 265.
The end of the take-off shaft 265 on the inside of the aircraft is connected to an output section 266L that outputs power from the transmission case to the left side. The end of the take-off shaft 265 on the outside of the aircraft is connected to the first input shaft 258 via a second connecting tube 267.

The inner circumferential surface of the second connecting tube 267 is formed in a hexagonal shape. The end of the take-out shaft 265 facing outward from the vehicle body is formed in a hexagonal prism shape. This hexagonal prism-shaped portion is inserted inside the second connecting tube 267. As a result, the rotational power of the take-out shaft 265 is transmitted to the second connecting tube 267. The power transmitted to the second connecting tube 267 is input to the first input shaft 258. The power input to the first input shaft 258 is transmitted to the rear wheel 4L via a first mechanism housed inside the wheel support 7L.

In this manner, the take-off shaft 265, the second connecting cylinder 267, and the first input shaft 258 constitute a power transmission shaft that transmits the power of the prime mover 17 to the rear wheel 4L.
The first inner cylinder 262 is slidable in the width direction of the machine body relative to the first outer cylinder 261. By sliding the first inner cylinder 262 outwardly of the machine body relative to the first outer cylinder 261, the amount of protrusion of the first inner cylinder 262 from the first outer cylinder 261 can be increased (see FIGS. 46 and 48). On the other hand, by sliding the first inner cylinder 262 inwardly of the machine body relative to the first outer cylinder 261, the amount of protrusion of the first inner cylinder 262 from the first outer cylinder 261 can be decreased (see FIGS. 45 and 47).

In the first adjustment mechanism 260L, when the first inner tube 262 is slid relative to the first outer tube 261, the removal shaft 265 is slid relative to the second connecting tube 267. As a result, when the amount of protrusion of the first inner tube 262 from the first outer tube 261 is increased, the distance between the removal shaft 265 and the first input shaft 258 becomes larger (see FIG. 48). When the amount of protrusion of the first inner tube 262 from the first outer tube 261 is decreased, the distance between the removal shaft 265 and the first input shaft 258 becomes smaller (see FIG. 47).

In this way, the first adjustment mechanism 260L can adjust the position of the rear wheel (one of the driving wheels) 4L in the vehicle width direction by sliding the first inner tube 262 relative to the first outer tube 261 and sliding the removal shaft 265 relative to the second connecting tube 267.
As shown in Figures 45, 46, and 49, the second adjustment mechanism 260R has an outer cylinder (second outer cylinder) 268 and an inner cylinder (second inner cylinder) 269. The second outer cylinder 268 corresponds to the left cylinder 28 shown in Figures 17 and 19. The second outer cylinder 268 includes one outer cylinder 270 arranged on the inside of the machine body and the other outer cylinder 271 arranged on the outside of the machine body. A first flange 270a is provided on one end (end on the outside of the machine body) of the one outer cylinder 270. A second flange 271a is provided on one end (end on the inside of the machine body) of the other outer cylinder 271. The first flange 270a and the second flange 271a are detachably connected. Specifically, the first flange 270a and the second flange 271a are connected by bolts and nuts. As a result, the one outer cylinder 270 and the other outer cylinder 271 are detachably connected.

The second outer tube 268 and the second inner tube 269 are both hexagonal tubes. The end of the second outer tube 268 on the inside of the machine body (the end of the one outer tube 270 on the inside of the machine body) is connected to the transmission case (not shown) via the third connecting tube 272 and the third connecting plate 273. The inside of the machine body of the second inner tube 269 is inserted into the second outer tube 268 from the outside of the machine body. The outside of the machine body of the second inner tube 269 is connected to the upper part of the wheel support 7R. The wheel support 7R houses a second mechanism that transmits power to the rear wheel 4R. The second mechanism is composed of a chain, a sprocket, etc.

49 , a power transmission shaft for transmitting the power of the prime mover 17 to the rear wheel 4R is inserted through the first inner cylinder 262 and the first outer cylinder 261. The power transmission shaft includes one shaft 274 to which the power from the prime mover 17 is transmitted, and the other shaft 275 which rotatably supports the rear wheel (other driving wheel) 4R.
The end of the one shaft 274 on the inside of the aircraft is connected to an output section 266R that outputs power from the transmission case to the right side. The end of the one shaft 274 on the outside of the aircraft is connected to the end of the other shaft 275 on the inside of the aircraft. The other shaft 275 is connected to the one shaft 274 via a connecting section 276 so as to be slidable in the aircraft width direction. The other shaft 275 has a shaft body 277 and a cylindrical body 278 arranged on the outer periphery side of the shaft body 277. The shaft body 277 is slidably inserted into one end side (outside the aircraft body) of the cylindrical body 278. The one shaft 274 is slidably inserted into the other end side (inside the aircraft body) of the cylindrical body 278.

As shown in FIG. 50, the cylinder 278 has a polygonal (hexagonal) inner peripheral surface 278e. The first shaft 274 has an insertion portion 274a having a polygonal (hexagonal) outer peripheral surface that can be inserted along the inner peripheral surface of the cylinder 278. As shown in FIG. 52, a polygonal (hexagonal) large diameter portion 277a is provided at one end of the shaft 277 inserted into one end of the cylinder 278. This allows the rotational power output from the transmission case to be transmitted from the first shaft 274 to the shaft 277 via the cylinder 278. The other end of the shaft 277 is connected to the second mechanism of the wheel support 7R.

The second inner tube 269 can slide in the width direction of the machine body relative to the second outer tube 268. By sliding the second inner tube 269 outward from the machine body relative to the second outer tube 268, the amount of protrusion of the second inner tube 269 from the second outer tube 268 can be increased (see Figures 46 and 51). In this state, the distance between the shaft body 277 and the one shaft 274 becomes larger. On the other hand, by sliding the second inner tube 269 inward from the machine body relative to the second outer tube 268, the amount of protrusion of the second inner tube 269 from the second outer tube 268 can be decreased (see Figures 45 and 49). In this state, the distance between the shaft body 277 and the one shaft 274 becomes smaller.

In the second adjustment mechanism 260R, when the second inner tube 269 is slid relative to the second outer tube 268, the tube body 278 is slid relative to the one shaft 274, and the shaft body 277 is slid relative to the tube body 278. As a result, when the amount of protrusion of the second inner tube 269 from the second outer tube 268 is increased, the distance between the shaft body 277 and the one shaft 274 becomes larger (see FIG. 51). When the amount of protrusion of the second inner tube 269 from the second outer tube 268 is decreased, the distance between the shaft body 277 and the one shaft 274 becomes smaller (see FIG. 49).

In this way, the second adjustment mechanism 260R can adjust the position of the rear wheel (one of the driving wheels) 4R in the vehicle width direction by sliding the second inner tube 269 relative to the second outer tube 268, sliding the cylinder body 278 relative to the one shaft 274, and sliding the shaft body 277 relative to the cylinder body 278.
The second adjustment mechanism 260R is configured to adjust the length of the power transmission shaft that transmits the power of the prime mover 17 to the rear wheel 4R by two-stage sliding. The two-stage sliding is the sliding of the cylinder 278 relative to the one shaft 274 and the sliding of the shaft body 277 relative to the cylinder 278. Therefore, the second adjustment mechanism 260R has a wider range of adjustment than the first adjustment mechanism 260L. In addition, the distance from the center of the width direction of the vehicle body 2 to the rear wheel (other driving wheel) 4R can be made longer than the distance from the center of the width direction of the vehicle body 2 to the rear wheel (one driving wheel) 4L. In other words, the rear wheel (other driving wheel) 4R can be disposed on the outer side of the vehicle body than the rear wheel (one driving wheel) 4L.

As shown in FIG. 49 etc., the connecting portion 276 connecting the one shaft 274 and the other shaft 275 has a first retaining portion 279 that prevents the other shaft 275 from coming off the one shaft 274 when it is slid toward the outside of the machine body. The first retaining portion 279 is provided on one end side (inside the machine body) of the cylindrical body 278. The other end side (outside the machine body) of the cylindrical body 278 is provided with a second retaining portion 280 that prevents the shaft body 277 from coming off the cylindrical body 278.

First, the second retaining portion 280 will be described.
As shown in Figures 50 and 52, the second retaining portion 280 has a second retaining member 282 fixed to the other end side (outer side of the machine body) of the cylindrical body 278. The second retaining portion 280 is composed of the second retaining member 282 and the large diameter portion 277a of the shaft body 277. The large diameter portion 277a is formed in a polygonal column shape (hexagonal column shape). The second retaining member 282 is an annular member having a circular hole 282a. The diameter of the circular hole 282a is smaller than the outer diameter (maximum outer diameter) of the large diameter portion 277a of the shaft body 277. Therefore, when the shaft body 277 is slid toward the outer side of the machine body relative to the cylindrical body 278, the large diameter portion 277a cannot pass through the circular hole 282a of the second retaining member 282. This makes it possible to prevent the shaft body 277 from coming off the cylindrical body 278.

Next, the first retaining portion 279 will be described.
As shown in Figures 49 and 53, the first retaining portion 279 has a first retaining member 281 that is detachably attached to one end side (the inside side of the machine body) of the cylindrical body 278.
54 and 55, the first retaining member 281 has a first portion 281a, a second portion 281b, and a third portion 281c. The first retaining member 281 is made of metal, and the first portion 281a, the second portion 281b, and the third portion 281c are integrally formed.

The first portion 281a is a portion that can be engaged with the outer peripheral surface of the cylindrical body 278 (the recessed groove 278a described later). The first portion 281a is composed of a pair of engaging claws 281d, 281e. The second portion 281b is a portion that has a polygonal (hexagonal) hole 281f. The hole 281f abuts against one end surface of the cylindrical body 278 (the surface on the inside of the machine body) and is a hole into which the insertion portion 274a can be inserted. The third portion 281c is a portion that connects the first portion 281a and the second portion 281b. The third portion 281c is composed of a pair of flat plates 281g, 281h that are arranged opposite each other.

The locking claws 281d extend from the flat plate 281g to one and the other circumferential sides of the cylindrical body 278. The locking claws 281e extend from the flat plate 281h to one and the other circumferential sides of the cylindrical body 278. The locking claws 281d and 281e extend so as to approach each other.
The pair of flat plates 281g, 281h constituting the third portion 281c are flexible and deformable, and the distance between the one flat plate 281g and the other flat plate 281h changes as a result of the flexible deformation. By changing the distance between the pair of flat plates 281g, 281h, the distance between the pair of locking claws 281d, 281e changes.

As shown in Figures 50 and 52, a groove 278a extending in the circumferential direction is formed on the outer peripheral surface of the cylindrical body 278. As shown in Figure 53, the first portion 281a (a pair of locking claws 281d, 281e) is locked in the groove 278a. The locking claws 281d, 281e can be released from the groove 278a by manually spreading the flat plates 281g, 281h and bending them. When the hands are released from the flat plates 281g, 281h, the flat plates 281g, 281h return to their original positions (parallel to each other), so that the locking claws 281d, 281e are locked in the groove 278a.

The first retaining member 281 is rotatable about a central axis CL1 of the cylindrical body 278. The first retaining member 281 is switchable, by rotation about the central axis CL1, between a retaining state in which the one shaft 274 is not permitted to come off the cylindrical body 278 and a non-retaining state in which the one shaft 274 is permitted to come off.
56, in the non-retained state, the phase of the polygon of the inner peripheral surface 278e of the cylinder 278 about the central axis CL1 matches the phase of the polygon of the inner peripheral surface of the hole 281f of the second portion 281b about the central axis CL1. "The phase matches" means that the positions of the corners of the polygons match (overlap when viewed from the direction of the central axis CL1).

The phase of the polygon of the inner peripheral surface 278e of the cylinder 278 around the central axis CL1 coincides with the phase of the polygon of the insertion portion 274a of the one shaft 274 around the central axis CL1. Therefore, the phase of the polygon of the outer peripheral surface of the insertion portion 274a of the one shaft 274 around the central axis CL1 coincides with the phase of the polygon of the inner peripheral surface of the hole 281f of the second part 281b around the central axis CL1. In this state, when the cylinder 278 of the other shaft 275 is slid toward the outside of the machine body relative to the one shaft 274, the corner 274b of the insertion portion 274a does not hit the edge of the hole 281f. This allows the cylinder 278 of the other shaft 275 to be removed from the one shaft 274. The one shaft 274 can also be inserted into the cylinder 278 of the other shaft 275.

As shown in FIG. 57, in the retained state, the phase of the polygon of the inner peripheral surface 278e of the cylinder 278 around the central axis CL1 is shifted (does not match) with the phase of the polygon of the hole 281f of the second portion 281b around the central axis CL1. Therefore, the phase of the polygon of the outer peripheral surface of the insertion portion 274a of the one shaft 274 around the central axis CL1 is shifted (does not match) with the phase of the polygon of the inner peripheral surface of the hole 281f of the second portion 281b around the central axis CL1. In this state, when the cylinder 278 of the other shaft 275 is slid toward the outside of the machine body relative to the one shaft 274, the corner of the insertion portion 274a hits and stops against the outer part (the surface of the first portion 281a) of the edge of the hole 281f. This prevents the cylinder 278 of the other shaft 275 from coming off the one shaft 274.

As shown in Figures 50 and 52, an abutment surface 278b is formed on the outer circumferential surface of the cylindrical body 278. The abutment surface 278b is a surface with which the third portion 281c comes into surface contact in the retained state. The abutment surface 278b is composed of a pair of flat surfaces 278c, 278d formed parallel to each other across the central axis CL1 of the cylindrical body 278. By bringing the third portion 281c of the first retaining member 281 into surface contact with the abutment surface 278b (specifically, by bringing the flat plate 281g into surface contact with the flat plate 278c and the flat plate 281h into surface contact with the flat plate 278d), it is possible to prevent the first retaining member 281 from rotating around the central axis CL1 of the cylindrical body 278. This makes it possible to maintain the retained state.

By manually spreading the flat plates 281g, 281h and bending the flat plates 281g, 281h so that the third portion 281c is not in surface contact with the abutment surface 278b, the first retaining member 281 can be rotated about the central axis CL1 of the cylindrical body 278. By rotating the first retaining member 281, the retained state can be released and the first retaining member 281 can be switched to a non-retained state.
Next, a front wheelbase adjustment mechanism for adjusting the wheelbase of the front wheels will be described.

As shown in Figures 45 and 46, the front wheelbase adjustment mechanism includes a third adjustment mechanism 290L provided on one side (left side) in the vehicle width direction, and a fourth adjustment mechanism 290R provided on the other side (right side) in the vehicle width direction. The third adjustment mechanism 290L is a mechanism that can adjust the position in the vehicle width direction of the front wheel (one driven wheel) 3L located on one side in the vehicle width direction. The fourth adjustment mechanism 290R is a mechanism that can adjust the position in the vehicle width direction of the front wheel (one driven wheel) 3R located on the other side in the vehicle width direction.

The third adjustment mechanism 290L has an outer tube (third outer tube) 291 and an inner tube (third inner tube) 292. The third outer tube 291 and the third inner tube 292 are both hexagonal tubes. The third outer tube 291 and the third inner tube 292 correspond to the third shaft body 35 shown in Figures 17 and 18. The end of the third outer tube 291 on the inside of the machine is connected to one end of the intermediate tube 293. The inside of the machine of the third inner tube 292 is inserted into the third outer tube 291 from the outside of the machine. The outside of the machine of the third inner tube 292 is connected to the upper part of the front wheel support mechanism 30L that supports the front wheel (driven wheel) 3L. The front wheel (driven wheel) 3R is supported by the front wheel support mechanism 30R on the third inner tube 292 and can swing in the front-rear direction together with the front wheel support mechanism 30R.

The third inner cylinder 292 is slidable in the width direction of the machine body relative to the third outer cylinder 291. By sliding the third inner cylinder 292 outwardly of the machine body relative to the third outer cylinder 291, the amount of protrusion of the third inner cylinder 292 from the third outer cylinder 291 can be increased (see FIG. 46). On the other hand, by sliding the third inner cylinder 292 inwardly of the machine body relative to the third outer cylinder 291, the amount of protrusion of the third inner cylinder 292 from the third outer cylinder 291 can be decreased (see FIG. 45).

In this way, the third adjustment mechanism 290L can adjust the position of the front wheel (driven wheel) 3L in the vehicle width direction by sliding the third inner tube 292 relative to the third outer tube 291.
As shown in Figures 45 and 46, the fourth adjustment mechanism 290R has an outer cylinder (fourth outer cylinder) 294 and an inner cylinder (fourth inner cylinder) 295. The fourth outer cylinder 294 and the fourth inner cylinder 295 correspond to the third shaft 35 shown in Figure 19. The fourth outer cylinder 294 and the fourth inner cylinder 295 are both hexagonal cylinders. The fourth outer cylinder 294 is a support cylinder that is arranged parallel to the power transmission shaft that transmits power to the rear wheel 4L and supports the front wheel (driven wheel) 3L via the fourth inner cylinder 295. The front wheel (driven wheel) 3L is supported by the front wheel support mechanism 30L on the fourth inner cylinder 295 and can swing in the front-rear direction together with the front wheel support mechanism 30L.

The fourth outer cylinder (support cylinder) 294 includes a one-side support cylinder 296 and an other-side support cylinder 297. The one-side support cylinder 296 is arranged parallel to the one-side outer cylinder 270. The other-side support cylinder 297 is arranged parallel to the other-side outer cylinder 271. The one-side support cylinder 296 and the one-side outer cylinder 270 are connected by a one-side connector 298. The other-side support cylinder 297 and the other-side outer cylinder 271 are connected by a other-side connector 299.

A third flange 296a is provided at one end (the end facing outward from the aircraft body) of the first support cylinder 296. A fourth flange 297a is provided at one end (the end facing inward from the aircraft body) of the second support cylinder 297. The third flange 296a and the fourth flange 297a are detachably connected. Specifically, the third flange 296a and the fourth flange 297a are connected by bolts and nuts. In this way, the first support cylinder 296 and the second support cylinder 297 are detachably connected.

The end of the one support tube 296 on the inside of the machine body is connected to the other end of the intermediate tube 293. The fourth inner tube 295 is inserted into the end of the other support tube 297 on the outside of the machine body. The fourth inner tube 295 is slidable in the width direction of the machine body relative to the other support tube 297. By sliding the fourth inner tube 295 outwardly of the machine body relative to the other support tube 297, the amount of protrusion of the fourth inner tube 295 from the other support tube 297 can be increased (see FIG. 46). On the other hand, by sliding the fourth inner tube 295 inwardly of the machine body relative to the other support tube 297, the amount of protrusion of the fourth inner tube 295 from the other support tube 297 can be decreased (see FIG. 45).

In this manner, the fourth adjustment mechanism 290R can adjust the position of the front wheel (driven wheel) 3R in the vehicle width direction by sliding the fourth inner tube 295 relative to the other support tube 297.
The length adjustable by the first adjustment mechanism 260L is the same as the length adjustable by the third adjustment mechanism 290L. The length adjustable by the second adjustment mechanism 260R is the same as the length adjustable by the fourth adjustment mechanism 290R. Therefore, the fourth adjustment mechanism 290R has a wider adjustment range than the third adjustment mechanism 290L. In addition, the distance from the center of the width direction of the vehicle body 2 to the front wheel (the other driven wheel) 3R can be made longer than the distance from the center of the width direction of the vehicle body 2 to the front wheel (the one driven wheel) 3L. In other words, the front wheel (the other driven wheel) 3R can be disposed on the outer side of the vehicle body than the front wheel (the one driven wheel) 3L.

A one-side connection tube 300 is attached to the one-side connection body 298 that connects the one-side support tube 296 and the one-side outer tube 270. The one-side connection tube 300 is arranged parallel to the one-side support tube 296 and the one-side outer tube 270. The other-side connection tube 301 is attached to the other-side connection body 299 that connects the other-side outer tube 271 and the other-side support tube 297. The other-side connection tube 301 is arranged parallel to the other-side support tube 297 and the other-side outer tube 271. The inside side of the one-side connection tube 300 and the inside end of the other-side connection tube 301 are detachably connected to each other.

The other connection tube 301 is connected to the third connecting plate 273 and the intermediate tube 293 via a connecting plate 302. The other connection tube 301 is connected to the first connecting plate 264 and the intermediate tube 293 via a connecting plate 303. The other connection tube 301 is connected to the third outer tube 291 via a connecting plate 304.
The transplanter 1 can be used as a normal transplanter for two-row planting by removing the other support cylinder 297, the other outer cylinder 271, the other connector 299, the other connector cylinder 301, and the other shaft 275. In other words, when reciprocating four-row planting is not performed, the transplanter 1 can be used as a normal transplanter for two-row planting by removing the other support cylinder 297, the other outer cylinder 271, the other connector 299, the other connector cylinder 301, and the other shaft 275, connecting the one outer cylinder 270 to the wheel support 7R, connecting the one shaft 274 to the second mechanism in the wheel support 7R, and connecting the one support cylinder 296 to the front wheel support mechanism 30R.

The other support tube 297, the other outer tube 271, the other connector 299, and the other connection tube 301 can be configured as a pre-connected integral unit. This integral unit can be used as an optional connecting part to be attached when obtaining a wheel spacing that can accommodate reciprocating four-row planting. By configuring the other support tube 297, the other outer tube 271, the other connector 299, and the other connection tube 301 as a pre-connected integral unit, the connecting parts can be attached and detached as a unit, making it possible to easily switch the transplanter 1 between a normal two-row planting structure and a reciprocating four-row planting structure.

The above-mentioned connecting parts can be attached by connecting the second flange 271a provided on the other outer tube 271 to the first flange 270a provided on the one outer tube 270, and connecting the fourth flange 297a provided on the other support tube 297 to the third flange 296a provided on the one support tube 296. The connecting parts can be removed by removing the second flange 271a from the first flange 270a and the fourth flange 297a from the third flange 296a.

As shown in FIG. 46, when performing a four-row reciprocating planting operation, the first adjustment mechanism 260L, the second adjustment mechanism 260R, the third adjustment mechanism 290L, and the fourth adjustment mechanism 290R are adjusted to position the front wheel 3R on the outer side of the machine body than the front wheel 3L, and the rear wheel 4R on the outer side of the machine body than the rear wheel 4L. Then, as shown in FIG. 58, the machine runs in one direction along one ridge UN with the left and right wheels sandwiching the ridge UN, and plants two rows of seedlings NE with the planting tool 80L of the first planting device 20L and the planting tool 80R of the second planting device 20R. Then, as shown in FIG. 59, the machine runs in the other direction along the same ridge UN and plants two rows of seedlings NE. This allows four rows of seedlings NE to be planted in one ridge UN.

<Seedling tray>
Next, the seedling tray and the like will be described.
1, 2, 3, and 4, the transplanter 1 is provided with seedling placement tables 149, 150 for placing seedling trays containing seedlings to be supplied to the seedling supply unit 9. The seedling placement tables 149, 150 are used to place seedling trays in which soil block seedlings are grown.

The seedling placing table 149 is disposed in front of the chair 11. The seedling placing table 149 is located above the seedling supply unit 9. The seedling placing table 149 is inclined so that the rear part is lower than the front part. The worker sitting on the chair 11 supplies the seedlings placed on the seedling placing table 149 in front to the seedling supply cups 40A, 40B of the seedling supply unit 9.
The seedling placing table 150 is a table for placing seedling trays to be replenished to the seedling placing table 149 when the seedlings contained in the seedling trays placed on the seedling placing table 149 are insufficient. In other words, the seedling placing table 150 is a table for placing seedling trays containing spare seedlings. Hereinafter, the seedling placing table 150 is referred to as the "spare seedling placing table 150."

The spare seedling rest 150 includes a first spare seedling rest 150A, a second spare seedling rest 150B, and a third spare seedling rest 150C.
The first spare seedling tray 150A is disposed in front of and on one side (right side) of the chair 11, i.e., on the right front side of the chair 11. The second spare seedling tray 150B is disposed in front of and on the other side (left side) of the chair 11, i.e., on the left front side of the chair 11. The third spare seedling tray 150C is disposed behind and on one side (right side) of the chair 11, i.e., on the right rear side of the chair 11.

The first spare seedling loading platform 150A is disposed to the right of the seedling supplying unit 9. The second spare seedling loading platform 150B is disposed to the left of the seedling supplying unit 9. The seedling supplying unit 9 is disposed between the first spare seedling loading platform 150A and the second spare seedling loading platform 150B in the width direction of the machine body. The third spare seedling loading platform 150C is disposed in a position overlapping with the chair 11 and the steering handle 5 in the front-rear direction.

As shown in Fig. 4 etc., the transplanter 1 is provided with a support 151 to which a spare seedling carrying table 150 is attached. The support 151 is attached to the machine body 2 and extends in the vertical direction. As shown in Figs. 2, 3 and 4, a plurality of spare seedling carrying tables 150 are attached to the support 151 at intervals in the vertical direction.
As shown in Figure 60, the spare seedling placing platform 150 is supported by the support pillar 151 by being attached to a mounting shaft 154 that passes through the support pillar 151. The mounting shaft 154 extends in the front-to-rear direction. The spare seedling placing platform 150 is rotatable about the mounting shaft 154 as a fulcrum. By rotating about the mounting shaft 154, the spare seedling placing platform 150 can be changed in position between a first position in which a placement surface 155 on which a seedling tray is placed is substantially horizontal, and a second position in which the placement surface 155 is substantially vertical. The seedling tray is placed when the spare seedling placing platform 150 is in the first position.

In Figures 1, 2, 3, and 4, of the first spare seedling placement table 150A, the second spare seedling placement table 150B, and the third spare seedling placement table 150C, a part of the second spare seedling placement table 150B (the first and second from the top) is shown in the second position, and the other spare seedling placement tables are shown in the first position. As shown in Figure 3, the placement surface 155 of the spare seedling placement table 150 is inclined so that its height decreases toward the support 151 in the first position.

As shown in FIG. 61, the spare seedling carrying platform 150 has an engagement portion 156 that allows adjacent spare seedling carrying platforms 150 in the vertical direction to engage with each other in the second position. The engagement portion 156 includes a first engagement portion 157 and a second engagement portion 158. As shown in FIG. 60, the first engagement portion 157 is provided on the outer side of the machine body (opposite the support 151) of the spare seedling carrying platform 150. As shown in FIG. 62, the second engagement portion 158 is provided on the inner side of the machine body (the support 151 side) of the spare seedling carrying platform 150. The first engagement portion 157 is a recess recessed from the carrying surface 155. The second engagement portion 158 is a protrusion that protrudes to the opposite side (back side) of the carrying surface 155. The second engagement portion 158 is formed in a hook shape bent into an L shape. As shown in FIG. 61, in the second position, the protrusion constituting the second engagement portion 158 fits into the recess constituting the first engagement portion 157. This causes vertically adjacent spare seedling placement tables 150 to engage with each other.

As shown in Figures 60, 62, etc., the transplanter 1 is equipped with a pressing device 159 that holds down the seedling tray T1 placed on the spare seedling placement table 150 (first spare seedling placement table 150A, second spare seedling placement table 150B, third spare seedling placement table 150C). The spare seedling placement table 150 is also used as a platform for placing an empty seedling tray T1 when no seedlings have been placed on it. Since the empty seedling tray T1 is light, it may fall due to wind or vibration. The pressing device 159 is provided to hold down the seedling tray T1 to prevent it from falling in this way.

62, the presser 159 is formed in an L-shape having a first portion 159a and a second portion 159b bent from the first portion 159a. An arc is formed between the first portion 159a and the second portion 159b.
The clamp 159 is disposed at a position where the operator can operate it when standing from the chair 11. The clamp 159 is attached to a mounting member 153 fixed to the support 151. The mounting member 153 is fixed to the upper end of the support 151, etc. A swing plate 160 is fixed to a second portion 159b of the clamp 159. The swing plate 160 is attached to the mounting member 153 by a bolt BL2 and a nut NT3. By loosening the engagement between the bolt BL2 and the nut NT3, the swing plate 160 can swing around the axis of the bolt BL2. By tightening the engagement between the bolt BL2 and the nut NT3, the swing plate 160 cannot swing around the axis of the bolt BL2. This fixes the position (angle) of the clamp 159.

The clamp 159 can be swung around the axis of the bolt BL2 by swinging the swing plate 160. The clamp 159 can be swung between a pressing position (see FIG. 63) where it abuts against the upper surface T1a of the seedling tray T1 and a non-pressing position (see FIG. 62) where it is separated from the upper surface T1a of the seedling tray T1. The swing operation of the clamp 159 can be performed by gripping the first part 159a with the hand. Therefore, the first part 159a of the clamp 159 is formed to a length that can be gripped by the hand (palm) of the operator when swinging the clamp 159. For example, the first part 159a is formed to a length equal to or greater than the width of the palm (for example, 80 mm or more, preferably 100 mm or more).

As shown in FIG. 63, when the pressing tool 159 is in the pressing position, the arc-shaped portion 159c between the first portion 159a and the second portion 159b abuts against the upper surface T1a of the seedling tray T1. This prevents the seedling tray T1 from being damaged when pressed by the pressing tool 159. Also, when the pressing tool 159 is in the pressing position, the first portion 159a is inclined relative to the upper surface T1a of the seedling tray T1. This creates a gap between the tip of the first portion 159a and the upper surface T1a, making it easier for the operator to grip the first portion 159a.

The clamp 159 holds down at least the seedling tray placed on the topmost spare seedling tray 150 among the multiple spare seedling trays 150 attached to the support 151 with vertical spacing. The seedling tray T1 placed on the topmost spare seedling tray 150 is the most likely to fall due to strong winds, etc., so by holding down at least the seedling tray placed on the topmost spare seedling tray 150, the seedling tray can be effectively prevented from falling. In this embodiment, the clamp 159 holds down only the seedling tray placed on the topmost spare seedling tray 150 among the multiple spare seedling trays 150 attached to the support 151 with vertical spacing. However, the clamp 159 may be arranged corresponding to all spare seedling trays 150 so that the clamp 159 holds down the seedling trays placed on all spare seedling trays 150.

As shown in FIG. 64, the pressing tool 159 can press down the top seedling tray 150 when multiple spare seedling trays 150 attached to the support 151 at intervals in the vertical direction are in the second position. FIG. 65 shows a state in which the pressing tool 159 is not pressing down the top seedling tray 150. As shown in FIG. 65, when the spare seedling trays 150 are in the second position, the spare seedling trays 150 adjacent in the vertical direction are engaged with each other, but the degree of engagement at this time is shallow. As shown in FIG. 64, by pressing down the top seedling tray 150, the top seedling tray 150 can be rotated slightly toward the first position to increase (deepen) the amount of engagement. This effectively prevents the spare seedling tray 150 in the second position from rattling due to vibrations caused when the transplanter 1 is traveling.

<Stand>
The transplanter 1 is provided with a stand for supporting the machine body 2 above the ground with the wheels raised. As shown in Figures 1, 2, 3 and 4, the stand includes a front stand 310 provided at the front of the machine body 2 and a rear stand 320 provided at the rear of the machine body 2.
<Front stand>
First, the front stand 310 will be described.

As shown in Figures 1, 36, etc., the front stand 310 is provided in front of and to the side of the chair 11. The front stand 310 is disposed behind the seedling supply unit 9. A portion of the front stand 310 overlaps with the rear of the seedling supply unit 9 in the front-to-rear direction. The front stand 310 is disposed behind the clutch pedal 15 disposed below the seedling supply unit 9 and on the outer side of the machine body than the clutch pedal 15.

36, 66, and 67, the front stand 310 includes a first front stand 310L and a second front stand 310R. The first front stand 310L is provided on the left front side of the chair 11. The second front stand 310R is provided on the right front side of the chair 11.
As shown in Figure 66 etc., the front stand 310 extends in the vertical direction and penetrates the boarding/alighting step 12. The front stand 310 penetrates the front part of the boarding/alighting step 12 on the outer side of the machine body (the side farther from the chair 11). The first front stand 310L penetrates the first boarding/alighting step 12L. The second front stand 310R penetrates the second boarding/alighting step 12R.

As shown in Figures 66, 68, etc., the front stand 310 has a rod body 311 extending in the vertical direction and a protruding portion 312 protruding from the outer circumferential surface of the rod body 311. The protruding portion 312 is provided on the upper portion of the rod body 311. The protruding portion 312 is formed in a cylindrical shape.
2 penetrates the rod body 311 and extends horizontally. As shown by arrow G1 in Fig. 68, the rod body 311 is configured to be rotatable about its vertical central axis. By rotating the rod body 311 about its vertical central axis, the orientation (projecting direction) of the protrusion 312 can be changed. The protrusion 312 also penetrates the rod body 311 and can be moved horizontally (in the direction of arrow G2 in Fig. 68).

As shown by the arrow G3 in Fig. 68, the front stand 310 can move linearly in the up-down direction (vertical direction) to rise and fall. By moving linearly in the up-down direction to rise and fall, the front stand 310 can move between a lower position (see Fig. 69) where the lower end abuts against the ground GR and an upper position (see Fig. 68) where the lower end is separated from the ground.
66, the transplanter 1 includes a first holding part 313 that holds the front stand 310 in an upper position, and a second holding part 314 that holds the front stand 310 in a lower position. The protrusion 312 of the front stand 310 is held by the first holding part 313 when the front stand 310 is in the upper position, and is held by the second holding part 314 when the front stand 310 is in the lower position.

First, the first holding portion 313 will be described.
The first holding section 313 is provided in the seedling supply section 9. As shown in Fig. 3 and Fig. 36, the seedling supply section 9 is provided with a rear cover 16 that covers the rear of the arrangement path (cup arrangement path) of the seedling supply cups 40A, 40B. As shown in Fig. 66, the first holding section 313 is provided in the rear cover 16.

66 and 67 , the first holding portion 313 includes a left holding portion 313L that holds the first front stand 310L and a right holding portion 313R that holds the second front stand 310R. The left holding portion 313L is provided on the left side of the rear cover 16. The right holding portion 313R is provided on the right side of the rear cover 16.
As shown in Figure 66, the rear cover 16 has an upper plate 16a, a left plate 16b, a right plate 16c, and a rear plate 16d. The rear plate 16d extends in the width direction of the machine body in front of the chair 11. One surface of the rear plate 16d faces forward, and the other surface faces rearward. The first holding portion 313 is attached to the other surface (rear surface) of the rear plate 16d.

The first holding portion 313 is made of a plate material bent into a substantially J-shape. Specifically, the first holding portion 313 is made up of a front portion 313a attached to the rear plate 16d and extending downward, a lower portion 313b extending rearward from a lower end of the front portion 313a, and a rear portion 313c extending upward from a rear end of the lower portion 313b.
As shown in Figures 66 and 68, the protrusion 312 of the front stand 310 is placed between the front part 313a and the rear part 313c and placed on the lower part 313b, whereby the protrusion 312 is held by the first holding part 313. This holds the front stand 310 in an upper position. When releasing the hold, the front stand 310 is moved upward to remove the protrusion 312 from between the front part 313a and the rear part 313c, and then the rod body 311 is rotated (for example, rotated 90°) around the central axis in the vertical direction to change the protruding direction of the rod body 311. As a result, even if the front stand 310 is lowered, the protrusion 312 does not come into contact with the first holding part 313, so that the protrusion 312 is no longer held by the first holding part 313, and it becomes possible to lower the protrusion 312 below the first holding part 313.

In this way, the front stand 310 can be changed between a holding position (position indicated by reference symbol P3 in FIG. 67) in which the protrusion 312 is held by the first holding part 313 and a release position (position indicated by reference symbol P4 in FIG. 67) in which the holding is released, by rotating the rod body 311 around the central axis in the vertical direction. The holding position is reached when the protrusion 312 extends in the width direction of the machine body, and the release position is reached when the protrusion 312 extends in a direction other than the width direction of the machine body (forward/backward direction, etc.). As shown in FIG. 36, when the front stand 310 is in the holding position, the protrusion 312 is positioned approximately parallel to the rear edge of the rear cover 16 of the seedling supply part 9. This prevents the protrusion 312 from interfering with the operator getting on and off the chair 11.

Next, the second holding portion 314 will be described.
The second holding portion 314 is provided on the boarding/alighting step 12 .
As shown in Figures 66 and 69, the second holding portion 314 has a housing body 315 attached to the boarding/alighting step 12 and a spring 316 housed inside the housing body 315.
70, the housing 315 has a bottom plate 315a, a front plate 315b, a rear plate 315c, and a side plate 315d. The housing 315 is open on the upper side, the lower side, and the inside of the aircraft.

The bottom plate portion 315a is disposed in an opening 12a formed by cutting out the front part of the boarding/alighting step 12 on the inside side of the aircraft. The bottom plate portion 315a is supported by a support material 18 that supports the underside of the boarding/alighting step 12 on the inside side of the aircraft. The bottom plate portion 315a has a hole 315e through which the rod body 311 passes. The front plate portion 315b stands upward from the front edge of the bottom plate portion 315a. The rear plate portion 315c stands upward from the rear edge of the bottom plate portion 315a. The front plate portion 315b and the rear plate portion 315c are disposed parallel to each other. The side plate portion 315d connects the edge of the front plate portion 315b on the outside side of the aircraft to the edge of the rear plate portion 315c on the outside side of the aircraft.

The front plate portion 315b is provided with a through hole 315f. The rear plate portion 315c is provided with a cutout 315g. The through hole 315f and the cutout 315g are provided in opposing positions. The upper edge of the through hole 315f is inclined so as to transition downward as it moves from the inside of the aircraft to the outside of the aircraft. The through hole 315f is formed so that its vertical width becomes wider as it moves from the inside of the aircraft to the outside of the aircraft. The cutout 315g is cut in a U-shape from the inside of the aircraft to the outside of the aircraft. The upper edge of the cutout 315g is inclined so as to transition downward as it moves from the outside of the aircraft to the inside of the aircraft.

The front stand 310 can be changed between a holding position where the protrusion 312 is held by the second holding portion 314 and a release position where the holding is released by rotating the rod body 311 around the vertical central axis (see arrow G1 in FIG. 68). The front stand 310 is in the holding position when the protrusion 312 is in the position shown by arrow P4 in FIG. 67 (when the protrusion 312 extends in the front-rear direction), and in the release position when the protrusion 312 is in the position shown by arrow P3 in FIG. 67 (when the protrusion 312 extends in the width direction of the aircraft).

As shown in FIG. 69, when the front stand 310 is in the holding position, the protrusion 312 is inserted into the notch 315g. When the front stand 310 is in the release position, the protrusion 312 is removed from the notch 315g. When the rod 311 is rotated around the vertical central axis to change the front stand 310 from the release position to the holding position, the protrusion 312 is inserted into the notch 315g. When the rod 311 is rotated to change the front stand 310 from the holding position to the release position, the protrusion 312 is removed from the notch 315g.

When the front stand 310 is in the holding position, i.e., when the protrusion 312 is inserted into the notch 315g, the protrusion 312 can be inserted into the through hole 315f by moving the protrusion 312 in the direction of the central axis of the protrusion 312 (forward). This causes the protrusion 312 to be inserted into the notch 315g and the through hole 315f. This makes it possible to securely hold the protrusion 312 in the second holding portion 314.

The spring 316 is a coil spring, and the rod 311 passes through it. As shown in FIG. 69, the lower end of the spring 316 abuts against the upper surface of the bottom plate 315a of the container 315. When the protrusion 312 is inserted into the notch 315g, the spring 316 is compressed in a state of abutting the protrusion 312 from below. As a result, the spring 316 biases the protrusion 312 inserted into the notch 315g in a direction to push up. The protrusion 312 is pushed up by the biasing force of the spring 316 and pressed against the upper edge of the notch 315g. As a result, the protrusion 312 is fixed in a state of being held in the notch 315g.

When the front stand 310 is changed from the holding position to the release position, the rod 311 is rotated around the vertical center axis (see arrow G3 in FIG. 68) to disengage the protruding portion 312 from the notch 315g. This makes it possible to move the front stand 310 in the vertical direction (see arrow G1).
As described above, the protrusion 312 has a different orientation (protruding direction) when in the holding position held by the first holding part 313 and a different orientation (protruding direction) when in the holding position held by the second holding part 314. Specifically, the protrusion 312 extends in the width direction of the aircraft when in the holding position held by the first holding part 313, and extends in the front-rear direction when in the holding position held by the second holding part 314. The protrusion 312 also extends in the front-rear direction when in a release position where the holding by the first holding part 313 is released, and extends in the width direction of the aircraft when in a release position where the holding by the second holding part 314 is released. That is, the holding position and the release position are reversed between the first holding part 313 and the second holding part 314. Therefore, after the holding by the first holding part 313 is released, the second holding part 314 can hold the protrusion 312 while roughly maintaining the orientation of the protrusion 312. Conversely, after the holding by the second holding portion 314 is released, the protruding portion 312 can be held by the first holding portion 313 while the orientation of the protruding portion 312 is generally maintained.

When the front stand 310 is in use, the protrusion 312 is held by the second holding portion 314. This allows the front stand 310 to be held in a lower position (see FIG. 69) where the lower end abuts the ground. When the front stand 310 is not in use, the protrusion 312 is held by the first holding portion 313. This allows the front stand 310 to be held in an upper position (see FIG. 68) where the lower end is off the ground.

<Rear stand>
Next, the rear stand 320 will be described.
2, 3, and 4, the rear stand 320 is provided at the rear of the vehicle body 2. The rear stand 320 is located below the steering handle 5. The rear stand 320 is capable of swinging between a lowered position (position indicated by an imaginary line in FIG. 2) in which it extends downward from a swing fulcrum 323 (a first horizontal shaft 323 described later) and a raised position (position indicated by a solid line in FIG. 2) in which it extends rearward from the swing fulcrum 323 (see arrow E1 in FIG. 2).

The rear stand 320 is a stand for supporting the machine body 2 above the ground with the rear wheels 4L, 4R lifted off the ground. By using the rear stand 320 and the front stand 310, the machine body 2 can be supported above the ground with the front wheels 3L, 3R and the rear wheels 4L, 4R lifted off the ground.
As shown in Figures 71, 72, 73, and 74, the rear stand 320 has a grounding body 321 that contacts the ground when in the lowered position, and a connecting body 322 that connects the grounding body 321 to the rear of the body 2 (the rear of the body frame 13). The grounding body 321 extends in the width direction of the body. The connecting body 322 includes a left connecting body 322L connected to the left part of the grounding body 321 and a right connecting body 322R connected to the right part of the grounding body 321. The left connecting body 322L and the right connecting body 322R extend parallel to each other. A first horizontal shaft 323 and a second horizontal shaft 324 penetrate the left connecting body 322L and the right connecting body 322R. The first horizontal shaft 323 and the second horizontal shaft 324 are arranged parallel to each other and extend in the width direction of the body. The first horizontal shaft 323 is disposed closer to the aircraft frame 13 than the second horizontal shaft 324 .

As shown in FIG. 74, the left connector 322L and the right connector 322R have long holes 321a formed therein that extend in the longitudinal direction of the connectors 322L, 322R. Both ends of the first horizontal shaft 323 pass through the long holes 321a. After passing through the long holes 321a, both ends of the first horizontal shaft 323 are inserted into fixing plates 325 that are fixed to the left and right rear parts of the aircraft frame 13, respectively.

As shown in FIG. 73 etc., the fixing plate 325 is formed with a circular hole 325a through which the first horizontal shaft 323 is inserted, a first cutout portion 325b and a second cutout portion 325c. The first cutout portion 325b and the second cutout portion 325c are arranged on an arc of the same radius centered on the circular hole 325a. The first cutout portion 325b and the second cutout portion 325c are cut in a U-shape in the direction toward the circular hole 325a. The second horizontal shaft 324 fits into the first cutout portion 325b when the rear stand 320 is in the raised position (see FIG. 73), and fits into the second cutout portion 325c when the rear stand 320 is in the lowered position (see FIG. 75).

As shown in Fig. 72, the first horizontal shaft 323 and the second horizontal shaft 324 are connected by a tension spring 326. One end of the tension spring 326 is engaged with the first horizontal shaft 323, and the other end is engaged with the second horizontal shaft 324. The tension spring 326 exerts a force that pulls the rear stand 320 toward the vehicle frame 13. Therefore, the tension spring 326 can exert a force in a direction in which the second horizontal shaft 324 fits into the first cutout portion 325b or the second cutout portion 325c. As a result, the second horizontal shaft 324 fits securely into the first cutout portion 325b or the second cutout portion 325c, so that the rear stand 320 can be maintained in the raised position or the lowered position.

When the rear stand 320 is pulled against the biasing force of the tension spring 326 from a state in which the second horizontal shaft 324 is fitted into the first cutout portion 325b or the second cutout portion 325c, the long hole 321a formed in the grounding body 321 moves relative to the first horizontal shaft 323. As a result, the rear stand 320 moves in a direction away from the aircraft frame 13 (see arrow C in Figure 74), and the second horizontal shaft 324 comes out of the first cutout portion 325b or the second cutout portion 325c. This makes it possible to swing the rear stand 320 from the raised position to the lowered position, or from the lowered position to the raised position.

<Push-down aid>
2, 3 and 4, a push-down assisting tool 330 is disposed below the steering handle 5. The push-down assisting tool 330 can be pushed down with the foot to assist the operator in pushing down the steering handle 5 with his/her hand to lift the front wheels 3L, 3R off the ground.

As shown in FIG. 1, the steering handle 5 has a left grip portion 5L that the operator grips with the left hand, and a right grip portion 5R that the operator grips with the right hand. The push-down assist device 330 is positioned so that it overlaps below the left grip portion 5L in a plan view. As shown in FIG. 72, the push-down assist device 330 is positioned outwardly of the machine body (left side in this embodiment) relative to the rear stand 320.

As shown in FIGS. 71 , 72 , 73 , etc., the push-down assisting device 330 has a swinging body 331 and a footboard 332 .
The rocking body 331 is a rod-shaped member. The base end of the rocking body 331 is attached to a support shaft 333 provided at the rear of the machine body 2 (at the rear of the machine body frame 13) so as to be capable of rocking. The footboard 332 is provided at the tip of the rocking body 331. The footboard 332 is made of a plate that is wider than the rocking body 331. The footboard 332 is a plate that an operator steps on when performing a pressing operation. The footboard 332 may be a separate member from the rocking body 331, or may be configured as a part of the rocking body 331. For example, a wider portion may be formed at the lower portion of the rocking body 331, and this portion may be used as the footboard 332.

As shown in FIG. 73 etc., the support shaft 333 is disposed above and behind the swing fulcrum 323. As shown in FIG. 71 and FIG. 72, the support shaft 333 is inserted into a cylinder 334 fixed to the rear of the machine frame 13 and extends in the width direction of the machine. The cylinder 334 is rotatable around the support shaft 333. The base end of the swing body 331 is fixed to the outer circumferential surface of the cylinder 334. The swing body 331 is rotatable around the support shaft 333 by rotating around the support shaft 333 together with the cylinder 334.

As shown in Figures 71, 72, 73, and 74, the push-down aid 330 has an abutment portion 335 that abuts against the rear stand 320 during a push-down operation when the rear stand 320 is in the raised position. The abutment portion 335 is provided at a position between the base end of the swinging body 331 and the footboard 332. The abutment portion 335 is connected to the swinging body 331 via a bracket 336. The bracket 336 is fixed between the base end and the tip end of the swinging body 331. The bracket 336 is not connected to the rear stand 320 and can swing together with the swinging body 331.

The abutment portion 335 is formed in a rod shape (cylindrical shape) extending in the width direction of the machine body. The abutment portion 335 extends from the bracket 336 toward the inside of the machine body (the right side in this embodiment). As shown in FIG. 72, the position of the abutment portion 335 in the width direction of the machine body overlaps with the grounding body 321 of the rear stand 320. Therefore, as shown in FIG. 73, when the rear stand 320 is in the raised position, the abutment portion 335 of the push-down auxiliary tool 330 abuts against the grounding body 321 of the rear stand 320. When the abutment portion 335 abuts against the rear stand 320 (the grounding body 321), the push-down auxiliary tool 330 extends obliquely downward and rearward from the support shaft 333.

As shown in FIG. 75, when the rear stand 320 is in the lowered position, the abutment portion 335 of the push-down aid 330 separates from the rear stand 320 and extends downward from the support shaft 333. When the rear stand 320 is moved from the raised position to the lowered position (see arrow L1 in FIG. 73), the abutment portion 335 of the push-down aid 330 separates from the grounding body 321 and rotates forward and downward (see arrow L2), to the position shown in FIG. 75. A holding portion may be provided at the rear of the machine frame 13 or the like to hold the push-down aid 330 in a predetermined position when the rear stand 320 is in the lowered position.

When the abutment portion 335 of the push-down aid 330 is in contact with the grounding body 321 of the rear stand 320 (see Figure 73), and the operator presses down on the footplate 332 with his/her foot, the push-down force (see arrow Q1 in Figure 2) is transmitted to the body 2 via the rear stand 320.
When the operator changes direction while walking and operating the transplanter 1, he or she pushes down the steering handle 5 with his or her hand and the push-down aid 330 with his or her foot. This allows the front wheels 3L, 3R to be lifted off the ground with the rear wheels 4L, 4R as the fulcrum (see arrow Q3 in FIG. 2) by both the push-down force acting on the steering handle 5 (see arrow Q1 in FIG. 2) and the push-down force acting on the push-down aid 330 (see arrow Q2 in FIG. 2). This makes it possible to easily change direction while walking and operating the transplanter 1.

In the embodiment described above, the push-down aid 330 is disposed in a position overlapping the lower part of the left grip part 5L, but the push-down aid 330 may be disposed in a position overlapping the lower part of the right grip part 5R. When the push-down aid 330 is disposed in a position overlapping the lower part of the left grip part 5L, the worker can push down the push-down aid 330 with the left leg. When the push-down aid 330 is disposed in a position overlapping the lower part of the right grip part 5R, the worker can push down the push-down aid 330 with the right leg.

Alternatively, two push-down aids 330 may be provided, with one push-down aid 330 positioned so that it overlaps the lower part of the left grip 5L, and the other push-down aid 330 positioned so that it overlaps the lower part of the right grip 5R. In this case, the operator can select one of the push-down aids 330 and push it down with one of the legs. Therefore, for example, one or the other push-down aid 330 can be used depending on whether the transplanter 1 is turned to the right or to the left.

The transplanter 1 of the above-described embodiment has the following advantages.
The transplanter 1 comprises a body 2, wheels 3L, 3R, 4L, and 4R that support the body 2 so that it can travel, a transplanting unit 8 that is provided on the body 2 and plants seedlings in a field, a ground contact wheel 100 that is provided on the body 2 and moves up and down following the undulations of the planting surface of the field, a lifting mechanism that varies the height of the body 2 relative to the wheels so as to maintain a constant height of the body 2 from the planting surface, and a swinging mechanism that swings the body 2 around a longitudinal axis so as to reduce the difference in height between the left and right sides of the body 2 from the planting surface. The ground contact wheel 100 includes a first ground contact wheel 100L provided on the left part of the body 2 and a second ground contact wheel 100R provided on the right part of the body 2, and the body control mechanism switches between a linked state in which both the lifting mechanism and the oscillating mechanism are operating and a non-linked state in which either the lifting mechanism or the oscillating mechanism is operating based on a first fluctuation amount which is the amount of fluctuation in height of the first ground contact wheel 100L and a second fluctuation amount which is the amount of fluctuation in height of the second ground contact wheel 100R.

With this configuration, it is possible to switch between an interlocking state in which both the lifting mechanism and the rocking mechanism are operating, and an uninterlocking state in which either the lifting mechanism or the rocking mechanism is operating, based on a first fluctuation amount, which is the amount of fluctuation in the height of the first grounding wheel 100L, and a second fluctuation amount, which is the amount of fluctuation in the height of the second grounding wheel 100R. This makes it possible to change the height and attitude of the machine body 2 to an optimal state in response to changes in the height of the planting surface. This makes it possible to keep the planting depth of the seedlings constant even if the planting surface is undulating.

In addition, the non-linked state includes a first non-linked state in which only the lifting mechanism operates, and a second non-linked state in which only the swinging mechanism operates, and the aircraft control mechanism switches between the first non-linked state and the second non-linked state based on the first fluctuation amount and the second fluctuation amount.
According to this configuration, the machine body control mechanism switches between a state in which only the lifting mechanism is operated and a state in which only the swinging mechanism is operated based on the first fluctuation amount and the second fluctuation amount, making it possible to change the height and posture of the machine body 2 to an optimal state in response to changes in the height of the planting surface and the left-right inclination of the planting surface.

In addition, the aircraft control mechanism switches to the first non-linked state when there is no difference between the first fluctuation amount and the second fluctuation amount and the average value of the first fluctuation amount and the second fluctuation amount is equal to or greater than a predetermined amount.
According to this configuration, when there is no difference in height between the left and right parts of the planting surface and there is a large change in height of the planting surface, the lifting mechanism can be operated without operating the rocking mechanism.
In addition, the aircraft control mechanism switches to the second non-linked state when there is a difference between the first fluctuation amount and the second fluctuation amount and the average value of the first fluctuation amount and the second fluctuation amount is less than a predetermined amount.

According to this configuration, when there is a difference in height between the left and right parts of the planting surface and the change in height of the planting surface is small, the rocking mechanism can be operated without operating the lifting mechanism.
In addition, the aircraft control mechanism switches to the linked state when there is a difference between the first fluctuation amount and the second fluctuation amount and the average value of the first fluctuation amount and the second fluctuation amount is equal to or greater than a predetermined amount.
According to this configuration, when there is a difference in height between the left and right parts of the planting surface and the change in height of the planting surface is large, both the lifting mechanism and the rocking mechanism can be operated.

The swing mechanism also includes a swing cylinder 36 that swings the body 2 around a longitudinal axis by telescopic drive, a fulcrum shaft 180 extending in the vertical direction, a first moving member 181 arranged on the left side of the fulcrum shaft 180 and moving in the longitudinal direction based on a first amount of movement, a second moving member 182 arranged on the right side of the fulcrum shaft 180 and moving in the longitudinal direction based on a second amount of movement, a connecting member 183 extending in the left-right direction to connect the first moving member 181 and the second moving member 182 and swing around the fulcrum shaft 180 based on the difference between the first movement amount D1, which is the movement amount of the first moving member 181, and the second movement amount D2, which is the movement amount of the second moving member 182, and a swing cylinder drive mechanism that connects the connecting member 183 and the swing cylinder 36 in a linked manner and drives the swing cylinder 36 when the difference between the first movement amount D1 and the second movement amount D2 becomes a predetermined amount or more.

According to this configuration, the oscillating mechanism can operate the oscillating cylinder 36 when the difference between the first movement amount D1 based on the first fluctuation amount and the second movement amount D2 based on the second fluctuation amount becomes greater than or equal to a predetermined amount.
The lifting mechanism also includes a lifting cylinder 14 that changes the height of the body 2 by extension and contraction, a fulcrum shaft 180, a first moving member 181, a second moving member 182, a connecting member 183, a lifting cylinder drive mechanism that connects the connecting member 183 and the lifting cylinder 14 so that they can be linked together, and a horizontal shaft 184 extending in the left-right direction, and the fulcrum shaft 180 tilts about the horizontal shaft 184 as a fulcrum based on the average value of the first movement amount D1 and the second movement amount D2, and the lifting cylinder drive mechanism drives the lifting cylinder 14 when the tilt amount of the fulcrum shaft 180 reaches or exceeds a certain value.
According to this configuration, the lifting mechanism can operate the lifting cylinder 14 when the average value of the first movement amount D1 based on the first fluctuation amount and the second movement amount D2 based on the second fluctuation amount becomes greater than or equal to a predetermined amount.

The oscillating cylinder drive mechanism also includes a lever 196 that can swing in a first direction to extend the oscillating cylinder 36 and a second direction to shorten it, a horizontal shaft 184 extending in the left-right direction, a first rotating member 194L connected to the left part of the connecting member 183 and rotating around the horizontal shaft 184 based on a first movement amount D1, a second rotating member 194R connected to the right part of the connecting member 183 and rotating around the horizontal shaft 184 based on a second movement amount D2, a first wire 195L connected to the first rotating member 194L and moving based on the rotation amount of the first rotating member 194L, and a second wire 195R connected to the second rotating member 194R. The device includes a second wire 195R that moves based on the amount of rotation of the movable member 194R, and a first interlocking mechanism 197 that links the movement of the first wire 195L and the second wire 195R with the swinging of the lever. The first interlocking mechanism 197 swings the lever 196 in a first direction when the amount of movement of the first wire 195L is greater than the amount of movement of the second wire 195R, swings the lever 196 in a second direction when the amount of movement of the second wire 195R is greater than the amount of movement of the first wire 195L, and does not swing the lever 196 when the amount of movement of the first wire 195L and the amount of movement of the second wire 195R are the same.

According to this configuration, the lever 196 that expands and contracts the oscillating cylinder 36 can be automatically switched between a state in which it oscillates in the first direction, a state in which it oscillates in the second direction, or a state in which it does not oscillate, based on the magnitude relationship between the first movement amount D1 and the second movement amount D2.
The lifting cylinder drive mechanism further includes a rotating body 198 that can rotate in a first direction to extend the lifting cylinder 14 and in a second direction to shorten the lifting cylinder 14, a first rotating member 194L connected to the left part of the connecting member 183 and rotating around the horizontal axis 184 based on a first movement amount D1, a second rotating member 194R connected to the right part of the connecting member 183 and rotating around the horizontal axis 184 based on a second movement amount D2, and a second interlocking mechanism 199 that rotates the rotating body 198 in conjunction with the rotation of the first rotating member 194L and the second rotating member 194R, and the second interlocking mechanism 199 rotates the rotating body 198 based on the average value of the rotation amount of the first rotating member 194L and the rotation amount of the second rotating member 194R.

According to this configuration, the rotating body 198 that expands and contracts the lifting cylinder 14 can be rotated based on the average value of the rotation amount of the first rotating member 194L based on the first movement amount D1 and the rotation amount of the second rotating member 194R based on the second movement amount D2.
In addition, a switching mechanism is provided for switching between a manual mode in which the lever 196 is manually swung and an automatic mode in which the lever 196 is automatically swung. The switching mechanism allows the lever 196 to be swung by the first interlocking mechanism 197 in the automatic mode, and does not allow the lever 196 to be swung by the first interlocking mechanism 197 in the manual mode.

According to this configuration, the switching mechanism can switch between a state in which the swing of the lever 196 by the first interlocking mechanism 197 is permitted (automatic mode) and a state in which the swing is not permitted (manual mode) as required.
It also has a setting lever 245 that sets the reference height of the ground contact wheel 100, and the setting lever 245 can change the reference height by swinging, and the first moving member 181 and the second moving member 182 move the same distance when the setting lever 245 is swung.

According to this configuration, the first moving member 181 and the second moving member 182 are moved the same distance by swinging the setting lever 245, so that the first ground contact wheel 100L and the second ground contact wheel 100R can be raised and lowered the same distance. Therefore, the planting depth can be set by swinging the setting lever 245.
It also comprises a fixed shaft 60 fixed to the body 2 and extending in the width direction of the body, and a movable shaft 65 that is swingable relative to the fixed shaft 60 and extends in the width direction of the body, the movable shaft 65 including a first movable shaft 65L connected to be interlocked with the first grounding wheel 100L, and a second movable shaft 65R connected to be interlocked with the second grounding wheel 100R, the first moving member 181 moving in conjunction with the swinging of the first movable shaft 65L, and the second moving member 182 moving in conjunction with the swinging of the second movable shaft 65R.

According to this configuration, the lifting and lowering of the first ground contact wheel 100L and the lifting and lowering of the second ground contact wheel 100R can be linked to separate movable shafts (the first movable shaft 65L and the second movable shaft 65R). Therefore, control based on the lifting and lowering of the first ground contact wheel 100L and control based on the lifting and lowering of the second ground contact wheel 100R can be performed independently.
The transplanter 1 also comprises a body 2 equipped with a transplanting section 8 for planting seedlings in a field, wheels 3L, 3R that support the body 2 so that it can move, and a stand (front stand) 310 for supporting the body 2 above the ground with the wheels 3L, 3R raised and lowered, and the stand 310 can be moved vertically between a lower position where its lower end abuts the ground and an upper position where its lower end is clear of the ground.

According to this configuration, the stand 310 can be raised and lowered vertically to move between a lower position where its lower end abuts the ground and an upper position where its lower end is away from the ground, thereby eliminating the need to install and remove the stand 310 and enabling the stand 310 to be placed in a narrow space.
It also includes a first holding portion 313 that holds the stand 310 in an upper position, and a second holding portion 314 that holds the stand 310 in a lower position.

According to this configuration, the stand 310 can be held by the first holding portion 313 when not in use, and can be held by the second holding portion 314 when in use.
It also includes a chair 11 mounted on the body 2 and a seedling supply unit 9 that supplies seedlings to the transplanting unit 8, the seedling supply unit 9 being positioned in front of the chair 11, and the first holding unit 313 being provided in the seedling supply unit 9.

According to this configuration, an operator sitting on the chair 11 can easily access the first holding unit 313 at a position closer than the seedling supply unit 9. In addition, the operator can get on and off the chair 11 by holding the stand 310.
The vehicle also includes a chair 11 mounted on the body 2 and a boarding/alighting step 12 provided to the side and below the chair 11, and the second holding portion 314 is provided on the boarding/alighting step 12.

According to this configuration, the worker can easily access the second holding portion 314 when getting on and off the chair 11 via the boarding/alighting step 12. In addition, the worker can get on and off the boarding/alighting step 12 by holding the stand 310.
The stand 310 has a rod body 311 extending in the vertical direction and a protrusion 312 protruding from the outer peripheral surface of the rod body 311, and the protrusion 312 is held by a first holding portion 313 when the stand 310 is in an upper position, and is held by a second holding portion 314 when the stand 310 is in a lower position.

According to this configuration, when the stand 310 is not in use, the protruding portion 312 can be held by the first holding portion 313, and when the stand 310 is in use, the protruding portion 312 can be held by the second holding portion 314.
In addition, the rod body 311 is configured to be rotatable around a central axis in the vertical direction, and by rotating the rod body 311 around the central axis, the stand 310 can be changed between a holding position in which the protrusion 312 is held by the first holding portion 313 or the second holding portion 314, and a release position in which the hold is released.

According to this configuration, the orientation of the protrusion 312 can be changed by a simple operation that does not require a large space, namely, rotating the rod body 311 around the central axis, thereby changing the stand 310 between the holding position and the release position.
In addition, the second retaining portion 314 has a notch 315g into which the protrusion 312 is inserted when the rod body 311 is rotated from the release position to the retaining position, and a spring 316 that biases the protrusion 312 inserted into the notch 315g in a direction pushing up the protrusion 312.

According to this configuration, the protruding portion 312 inserted into the notch 315g is pushed up by the spring 316, so that the protruding portion 312 can be pressed against the upper edge of the notch 315g. Therefore, it is possible to prevent the protruding portion 312 from unintentionally coming out of the notch 315g.
The transplanter 1 also comprises a body 2 provided with a transplanting section 8 for planting seedlings in a field, front wheels 3L, 3R and rear wheels 4L, 4R which support the body 2 so that it can run, a steering handle 5 provided at the rear of the body 2 and which the operator holds in his/her hand when operating the machine while walking, and a push-down aid 330 which is arranged below the steering handle 5 and can be pushed down with the foot to assist the operator in pushing down the steering handle 5 with his/her hand to lift the front wheels 3L, 3R off the ground.

According to this configuration, when the operator changes direction while walking and operating the transplanter 1, by pushing down the steering handle 5 with his hand and pushing down the push-down aid 330 with his foot, the operator can use the strength of his arms and legs to lift the front wheels 3L, 3R off the ground, making it easy to change direction while walking and operating the transplanter 1.
The vehicle also includes a rear stand 320 that is swingably mounted to the rear of the vehicle body 2 and supports the vehicle body 2 on the ground with the rear wheels 4L, 4R raised. The rear stand 320 is swingable between a lowered position extending downward from a swing fulcrum 323 and an elevated position extending rearward from the swing fulcrum 323. The push-down aid 330 has an abutment portion 335 that abuts against the rear stand 320 during a push-down operation when the rear stand 320 is in the elevated position.

According to this configuration, when the rear stand 320 is in the raised position, pushing down the push-down aid 330 with the foot causes the abutment portion 335 to abut against the rear stand 320. Therefore, the force of pushing down the push-down aid 330 with the foot can be transmitted to the machine body 2 by utilizing the rear stand 320.
Furthermore, when the contact portion 335 is in contact with the rear stand 320, the push-down auxiliary tool 330 extends obliquely downward and rearward from the support shaft 333.

According to this configuration, when using the push-down assist tool 330, the push-down assist tool 330 can be disposed at a position and angle that allows the push-down assist tool 330 to be easily pushed down with the foot.
When the rear stand 320 is in the lowered position, the pressing aid extends downward from the support shaft 333 with the contact portion 335 separated from the rear stand 320 .
According to this configuration, when the push-down assist tool 330 is not being used, the push-down assist tool 330 can be placed in a position where it does not get in the way.

In addition, the push-down aid 330 has a rocking body 331 that is attached so as to be able to rock on a support shaft 333 provided at the rear of the body 2, and a footboard 332 that is provided at the tip of the rocking body 331 and that the operator steps on when performing the push-down operation.
With this configuration, by stepping on the footboard 332, the force of the foot is efficiently transmitted to the rocking body 331, thereby rocking the rocking body 331 about the support shaft 333 and lifting the front wheels 3L, 3R off the ground.

Moreover, the support shaft 333 is disposed above and behind the swing fulcrum 323 .
According to this configuration, the push-down assist tool 330 can be disposed close to the worker who is walking, so that the push-down assist tool 330 can be easily operated.
In addition, the steering handle 5 has a left grip portion 5L that is held by the operator with his left hand and a right grip portion 5R that is held by the operator with his right hand, and the push-down assist device 330 is positioned in a position that overlaps below the left grip portion 5L and/or the right grip portion 5R when viewed in a plane.

According to this configuration, an operator holding the steering handle 5 can easily push down the push-down assist tool 330 with his/her left or right foot.
The transplanter 1 also includes a transplanting section 8 for planting seedlings in a field, a seedling supplying section 9 for supplying seedlings to the transplanting section 8, a seedling placing table (spare seedling placing table) 150 for placing seedling trays T1 containing seedlings to be supplied to the seedling supplying section 9, and a pressing device 159 for pressing the seedling trays T1 placed on the seedling placing table 150.

According to this configuration, the seedling tray T1 placed on the seedling placement stand 150 can be held down by the holding device 159, thereby preventing the seedling tray T1 from falling off the seedling placement stand 150 due to strong winds, etc.
In addition, the pressing tool 159 can swing between a pressing position where it abuts against the upper surface T1a of the seedling tray T1 and a non-pressing position where it is separated from the upper surface T1a.

According to this configuration, the pressing tool 159 can be changed between the pressing position and the non-pressing position by a simple operation of swinging the pressing tool 159.
In addition, the clamp 159 is formed in an L-shape having a first portion 159a and a second portion 159b bent from the first portion 159a, and the first portion 159a is formed to a length that allows the operator to grip it with his or her hand when swinging the clamp 159.

With this configuration, an operator can grasp first portion 159a and swing clamp 159, eliminating the need for a separate handle for swinging clamp 159, and reducing the number of parts in clamp 159.
Further, the portion between the first portion 159a and the second portion 159b is formed in an arc shape, and when the presser 159 is in the pressing position, the arc-shaped portion 159c abuts against the upper surface T1a.

According to this configuration, when the upper surface T1a of the seedling tray T1 is pressed by the pressing tool 159, the upper surface T1a can be prevented from being scratched or damaged.
When the pressing tool 159 is in the pressing position, the first portion 159a is inclined with respect to the upper surface T1a.
According to this configuration, a gap is created between the tip of the first portion 159a and the upper surface T1a, making it easier for an operator to grip the first portion 159a.

The plant also includes a support 151 to which the seedling carrying tables 150 are attached, the support 151 extending in the vertical direction, and the seedling carrying tables 150 are attached to the support 151 at intervals in the vertical direction in multiple numbers, and a pressing device 159 is attached to the support 151 and presses down a seedling tray T1 placed on at least the uppermost seedling carrying table 150 among the multiple seedling carrying tables 150.
According to this configuration, since the seedling tray T1 placed on the top spare seedling placing stand 150 is the most likely to fall due to strong winds, etc., by holding down at least the seedling tray placed on the top spare seedling placing stand 150, the seedling tray T1 can be effectively prevented from falling.

The seedling trays 150 can be changed between a first position in which the placement surface 155 on which the seedling tray T1 is placed is approximately horizontal and a second position in which the placement surface 155 is approximately vertical. The seedling trays 150 have engaging portions 156 that allow adjacent seedling trays 150 to engage with each other in the vertical direction in the second position. The clamp 159 can hold down the top seedling tray 150 when the seedling trays 150 are in the second position.

According to this configuration, by pressing down the top seedling tray 150, the top seedling tray 150 can be rotated slightly toward the first position to increase (deepen) the engagement amount, thereby effectively preventing the spare seedling tray 150 in the second position from rattling.
In addition, a chair 11 is arranged behind the seedling supply unit 9, and the pressing device 159 is arranged in a position where it can be operated by an operator standing on the chair 11.

According to this configuration, the operator can operate the pressing device 159 while standing from the chair 11, and therefore the pressing device 159 is easy to operate.
The transplanter 1 also comprises a body 2, a lifting member 70 which is capable of being raised and lowered relative to the body 2 and includes a planting tool 80 which holds the seedlings and lowers to plant the seedlings in a field, a seedling supply unit 9 which drops and supplies the seedlings to the planting tool 80 when the lifting member 70 is in the raised position, and an intermediate hopper 71 which has a fixed position relative to the body 2 and is positioned between the lifting member 70 and the seedling supply unit 9 to relay the drop supply of the seedlings from the seedling supply unit 9 to the lifting member 70, and the intermediate hopper 71 is made of an elastic body and is positioned in a position where it comes into contact with the lifting member 70 when the lifting member 70 is in the raised position.

According to this configuration, when the lifting member 70 including the planting tool 80 is in the raised position, it comes into contact with the relay hopper 71 made of an elastic material, so that even if the relay hopper 71 becomes clogged or stuck with seedlings, an impact can be applied to the relay hopper 71, causing the seedlings to fall into the planting tool 80. This allows seedlings to be smoothly supplied from the seedling supply unit 9 to the planting tool 80. In addition, because the relay hopper 71 is made of an elastic material, deformation or damage to the lifting member 70 can be prevented when the lifting member 70 comes into contact with the relay hopper 71.

The relay hopper 71 is formed by rolling a sheet 73 made of an elastic material into a cylindrical shape.
According to this configuration, the shape and size of the relay hopper 71 can be easily adjusted, so that the degree of contact with the lifting member 70 can be appropriately adjusted.
Also, a holder 61 is provided for holding the upper portion of the relay hopper 71, and the holder 61 is made of a rigid material.

According to this configuration, the upper part of the relay hopper 71 is prevented from being deformed due to contact with the lifting member 70. As a result, the seedlings dropping from the seedling supplying section 9 can be reliably received in the relay hopper 71.
The holder 61 also has a frame 62 attached along the periphery of the upper part of the relay hopper 71 , and a fixing portion 63 that fixes the frame 62 to a position below the seedling supplying section 9 .

With this configuration, the frame 62 can reliably hold the upper periphery of the relay hopper 71 , and the fixing portion 63 can fix the holder 61 to a position below the seedling supplying portion 9 .
The lifting member 70 also has a planting tool 80 that penetrates the ground of the field in the lowered position, and a seedling guide 75 that is positioned above the planting tool 80 and guides seedlings falling from the relay hopper 71 toward the planting tool 80, and when the planting tool 80 is in the raised position, the seedling guide 75 comes into contact with the relay hopper 71.

According to this configuration, by bringing the seedling guide 75, rather than the planting tool 80, into contact with the relay hopper 71, it is possible to prevent the planting tool 80 from bending and causing problems with planting.
Also, when the planting tool 80 is in the raised position, the lower part of the relay hopper 71 is inserted into the upper part of the seedling guide 75.
With this configuration, it is possible to reliably supply seedlings from the relay hopper 71 to the seedling guide 75.
At least a portion of the inner surface of the relay hopper 71 extends substantially vertically from the upper end to the lower end.
With this configuration, it is possible to reliably prevent seedlings from becoming stuck inside the relay hopper 71.

The transplanter 1 also includes a body 2, a prime mover 17 mounted on the body 2, a transplanting section 8 provided on the body 2 for planting seedlings in a field, drive wheels 4L, 4R that support the body 2 so that it can run and rotate by receiving the power of the prime mover 17, and a power transmission shaft that transmits the power of the prime mover 17 to the drive wheels 4L, 4R. The drive wheels 4L, 4R include a first drive wheel 4L arranged on one side of the body width direction and a second drive wheel 4R arranged on the other side of the body width direction. The power transmission shaft includes a first shaft 274 to which the power from the prime mover 17 is transmitted and a second shaft 275 that rotatably supports the second drive wheel 4R. The second shaft 275 is connected to the first shaft 274 via a connecting section 276 so as to be slidable in the body width direction. The connecting section 276 has a first retaining section 279 that prevents the second shaft 275 from coming off the first shaft 274 when it is slid.

With this configuration, the length of the power transmission shaft can be changed by sliding the other shaft 275 relative to the one shaft 274, and the first anti-slip portion 279 prevents the other shaft 275 from coming off the one shaft 274, making it possible to easily and reliably change the distance between the wheels, for example when performing reciprocating four-row planting.
In addition, the other shaft 275 has a shaft body 277 and a cylindrical body 278 arranged on the outer periphery of the shaft body 277, and the one shaft 274 is slidably inserted into one end side of the cylindrical body 278, and the shaft body 277 is slidably inserted into the other end side of the cylindrical body 278. A first anti-slip portion 279 is provided on one end side of the cylindrical body 278, and a second anti-slip portion 280 is provided on the other end side of the cylindrical body 278 to prevent the shaft body 277 from detaching from the cylindrical body 278.

According to this configuration, it is possible to prevent the shaft body 277 and the one shaft 274 from coming off the cylindrical body 278 when changing the length of the power transmission shaft.
In addition, the second anti-slip portion 280 has a second anti-slip member 282 fixed to the other end side of the cylindrical body 278, and the first anti-slip portion 279 has a first anti-slip member 281 removably attached to one end side of the cylindrical body 278.

According to this configuration, the shaft 277 can be inserted in advance from the other end side of the cylindrical body 278 to which the second anti-slip member 282 is fixed, and then the first anti-slip member 281 can be attached to one end side of the cylindrical body 278 and one shaft 274 can be inserted.
In addition, the first anti-slip member 281 is rotatable around the central axis of the cylindrical body 278, and by rotating around the central axis, it is possible to switch between an anti-slip state that does not allow the one shaft 274 to come off the cylindrical body 278, and a non-anti-slip state that allows it to come off.

According to this configuration, after inserting one shaft 274 into one end side of the cylindrical body 278, the first anti-slip member 281 can be rotated around the central axis of the cylindrical body 278 to switch between a retained state and a non-retained state.
Furthermore, the cylindrical body 278 has a polygonal inner surface 278e, the one shaft 274 has an insertion portion 274a with a polygonal outer peripheral surface that can be inserted along the inner peripheral surface 278e, and the first anti-slip member 281 has a first portion 281a that can be engaged with the outer peripheral surface of the cylindrical body 278, and a second portion 281b that abuts one end face of the cylindrical body 278 and has a polygonal hole 281f into which the insertion portion 274a can be inserted, so that in the non-anti-slip state, the phase of the polygon of the inner peripheral surface 278e of the cylindrical body 278 around the central axis of the polygon of the hole 281f of the second portion 281b matches, and in the anti-slip state, the phase of the polygon of the inner peripheral surface 278e of the cylindrical body 278 around the central axis of the polygon of the hole 281f of the second portion 281b is shifted.

According to this configuration, by rotating the first anti-slip member 281 around the central axis of the cylindrical body 278, the phase around the central axis of the polygon of the inner surface 278e of the cylindrical body 278 can be aligned to achieve a non-anti-slip state, or the phase can be shifted to achieve a non-anti-slip state.
In addition, the first anti-slip member 281 has a third portion 281c connecting the first portion 281a and the second portion 281b, and a contact surface 278b is formed on the outer circumferential surface of the cylindrical body 278 with which the third portion 281c comes into face-to-face contact in the anti-slip state.

According to this configuration, the retained state can be easily obtained by bringing the third portion 281c into surface contact with the abutment surface 278b. In addition, in the retained state, it is possible to prevent the first retaining member 281 from unintentionally rotating and becoming in the non-retained state.
The third portion 281c is composed of a pair of flat plates 281g, 281h arranged opposite each other, and the abutment surface 278b is composed of a pair of flat surfaces formed parallel to each other and sandwiching the central axis of the cylindrical body 278 therebetween.

According to this configuration, it is possible to reliably obtain a retained state because the third portion 281c can be brought into surface contact with the abutment surface 278b at two points on either side of the central axis of the cylindrical body 278. In addition, in the retained state, it is possible to reliably prevent the first retaining member 281 from unintentionally rotating and becoming in a non-retained state.
In addition, the first portion 281a is composed of a pair of locking claws 281d, 281e extending respectively from a pair of flat plates 81g, 281h, and a circumferentially extending groove 278a is formed on the outer circumferential surface of the cylindrical body 278, and the pair of locking claws 281d, 281e are locked in the groove 278a.

According to this configuration, the locking claws 281 d and 281 e are locked in the recessed groove 278 a , thereby preventing the first retaining member 281 from coming off the cylindrical body 278 .
It also has one outer tube 270 arranged on the outer periphery of one shaft 274, and the other outer tube 271 arranged on the outer periphery of the other shaft 275, and a first flange 270a is provided at one end of the one outer tube 270, and a second flange 271a connectable to the first flange 270a is provided at one end of the other outer tube 271.

According to this configuration, the first flange 270a and the second flange 271a are detachable, making it possible to easily change the distance between the drive wheels 4L, 4R, for example, when performing reciprocating four-row planting.
It also includes driven wheels 3L, 3R that rotate as the vehicle body 2 travels, and a support tube arranged parallel to the power transmission shaft and supporting the driven wheels 3L, 3R. The support tube includes one support tube 296 arranged parallel to and connected to one outer tube 270, and the other support tube 297 arranged parallel to and connected to the other outer tube 271, and a third flange 296a is provided at one end of the one support tube 296, and a fourth flange 297a connectable to the third flange 296a is provided at one end of the other support tube 297.

According to this configuration, the third flange 296a and the fourth flange 297a are detachable, making it possible to easily change the distance between the driven wheels 3L, 3R, for example, when performing reciprocating four-row planting.
Although the embodiment of the present invention has been described above, the embodiment disclosed herein should be considered as illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

1 Transplanter 2 Machine body 3L, 3R Wheels (front wheels)
4L, 4R wheels (rear wheels)
8 Transplantation section 14 Lifting cylinder 36 Swinging cylinder 60 Fixed shaft 65 Movable shaft 65L First movable shaft 65R Second movable shaft 100 Ground contact wheel (suppression wheel)
100L First grounding wheel (first suppression wheel)
100R 2nd ground contact wheel (2nd suppression wheel)
180 Pivot shaft 181 First moving member 182 Second moving member 183 Connection member 184 Horizontal shaft 194L First rotating member 194R Second rotating member 195L First wire 195R Second wire 196 Lever 197 First interlocking mechanism 198 Rotating body 199 Second interlocking mechanism 245 Setting lever D1 First movement amount D2 Second movement amount

Claims (8)

The aircraft and
Wheels that support the vehicle body so that it can run;
A transplanting unit provided on the machine body for planting seedlings in a field;
A ground wheel is provided on the machine body and moves up and down in accordance with the undulations of the planting surface of the field;
A vehicle control mechanism including a lifting mechanism that changes the height of the vehicle relative to the wheels so as to maintain a constant height of the vehicle from the planting surface, and a swinging mechanism that swings the vehicle around a longitudinal axis so as to reduce the difference in height between the left and right parts of the vehicle from the planting surface;
Equipped with
The ground contact wheels include a first ground contact wheel provided on a left portion of the aircraft body and a second ground contact wheel provided on a right portion of the aircraft body;
the aircraft control mechanism switches between an interlocking state in which both the lifting mechanism and the swinging mechanism are operating and a non-interlocking state in which either the lifting mechanism or the swinging mechanism is operating, based on a first fluctuation amount that is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount that is a fluctuation amount of the height of the second ground contact wheel ;
the non-interlocking state includes a first non-interlocking state in which only the lifting mechanism operates, and a second non-interlocking state in which only the swinging mechanism operates,
The machine control mechanism is a mechanism that switches between the first non-linked state and the second non-linked state based on the first fluctuation amount and the second fluctuation amount, and switches the transplanter to the first non-linked state when there is no difference between the first fluctuation amount and the second fluctuation amount and the average value of the first fluctuation amount and the second fluctuation amount is equal to or greater than a predetermined amount. The aircraft and
Wheels that support the vehicle body so that it can run;
A transplanting unit provided on the machine body for planting seedlings in a field;
A ground wheel is provided on the machine body and moves up and down in accordance with the undulations of the planting surface of the field;
A vehicle control mechanism including a lifting mechanism that changes the height of the vehicle relative to the wheels so as to maintain a constant height of the vehicle from the planting surface, and a swinging mechanism that swings the vehicle around a longitudinal axis so as to reduce the difference in height between the left and right parts of the vehicle from the planting surface;
Equipped with
The ground contact wheels include a first ground contact wheel provided on a left portion of the aircraft body and a second ground contact wheel provided on a right portion of the aircraft body;
the aircraft control mechanism switches between an interlocking state in which both the lifting mechanism and the swinging mechanism are operating and a non-interlocking state in which either the lifting mechanism or the swinging mechanism is operating, based on a first fluctuation amount that is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount that is a fluctuation amount of the height of the second ground contact wheel ;
the non-interlocking state includes a first non-interlocking state in which only the lifting mechanism operates, and a second non-interlocking state in which only the swinging mechanism operates,
The machine control mechanism is a mechanism that switches between the first non-linked state and the second non-linked state based on the first fluctuation amount and the second fluctuation amount, and switches the transplanter to the second non-linked state when there is a difference between the first fluctuation amount and the second fluctuation amount and an average value of the first fluctuation amount and the second fluctuation amount is less than a predetermined amount. The aircraft and
Wheels that support the vehicle body so that it can run;
A transplanting unit provided on the machine body for planting seedlings in a field;
A ground wheel is provided on the machine body and moves up and down in accordance with the undulations of the planting surface of the field;
A vehicle control mechanism including a lifting mechanism that changes the height of the vehicle relative to the wheels so as to maintain a constant height of the vehicle from the planting surface, and a swinging mechanism that swings the vehicle around a longitudinal axis so as to reduce the difference in height between the left and right parts of the vehicle from the planting surface;
Equipped with
The ground contact wheels include a first ground contact wheel provided on a left portion of the aircraft body and a second ground contact wheel provided on a right portion of the aircraft body;
the aircraft control mechanism switches between an interlocking state in which both the lifting mechanism and the swinging mechanism are operating and a non-interlocking state in which either the lifting mechanism or the swinging mechanism is operating, based on a first fluctuation amount that is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount that is a fluctuation amount of the height of the second ground contact wheel ;
the non-interlocking state includes a first non-interlocking state in which only the lifting mechanism operates, and a second non-interlocking state in which only the swinging mechanism operates,
The machine control mechanism is a mechanism that switches between the first non-linked state and the second non-linked state based on the first fluctuation amount and the second fluctuation amount, and switches to the linked state when there is a difference between the first fluctuation amount and the second fluctuation amount and an average value of the first fluctuation amount and the second fluctuation amount is equal to or greater than a predetermined amount . The aircraft and
Wheels that support the vehicle body so that it can run;
A transplanting unit provided on the machine body for planting seedlings in a field;
A ground wheel is provided on the machine body and moves up and down in accordance with the undulations of the planting surface of the field;
A vehicle control mechanism including a lifting mechanism that changes the height of the vehicle relative to the wheels so as to maintain a constant height of the vehicle from the planting surface, and a swinging mechanism that swings the vehicle around a longitudinal axis so as to reduce the difference in height between the left and right parts of the vehicle from the planting surface;
Equipped with
The ground contact wheels include a first ground contact wheel provided on a left portion of the aircraft body and a second ground contact wheel provided on a right portion of the aircraft body;
the aircraft control mechanism switches between an interlocking state in which both the lifting mechanism and the swinging mechanism are operating and a non-interlocking state in which either the lifting mechanism or the swinging mechanism is operating, based on a first fluctuation amount that is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount that is a fluctuation amount of the height of the second ground contact wheel ;
The rocking mechanism includes:
A swing cylinder that swings the body around an axis in the front-rear direction by telescopic drive;
A fulcrum axis extending in the vertical direction;
a first moving member disposed to the left of the fulcrum shaft and moving in a front-rear direction based on the first fluctuation amount;
a second moving member disposed on the right side of the fulcrum shaft and moving in a front-rear direction based on the second fluctuation amount;
a connecting member extending in the left-right direction to connect the first moving member and the second moving member, and oscillating about the fulcrum shaft based on a difference between a first movement amount that is a movement amount of the first moving member and a second movement amount that is a movement amount of the second moving member;
a swing cylinder drive mechanism that connects the connecting member and the swing cylinder so as to be interlocked with each other and drives the swing cylinder when a difference between the first movement amount and the second movement amount becomes equal to or greater than a predetermined amount;
It has
The swing cylinder drive mechanism includes:
a lever that can be swung in a first direction to extend the sway cylinder and in a second direction to shorten the sway cylinder;
A horizontal axis extending in the left-right direction;
a first rotating member connected to a left portion of the connecting member and rotating about the horizontal axis based on the first movement amount;
a second rotation member connected to a right portion of the connecting member and rotating about the horizontal axis based on the second movement amount;
a first wire connected to the first rotating member and moving based on an amount of rotation of the first rotating member;
A second wire connected to the second rotating member and moving based on the amount of rotation of the second rotating member;
a first interlocking mechanism that interlocks movement of the first wire and the second wire with a swing of the lever;
Equipped with
The first interlocking mechanism swings the lever in the first direction when the movement amount of the first wire is greater than the movement amount of the second wire, swings the lever in the second direction when the movement amount of the second wire is greater than the movement amount of the first wire, and does not swing the lever when the movement amount of the first wire and the movement amount of the second wire are the same . The aircraft and
Wheels that support the vehicle body so that it can run;
A transplanting unit provided on the machine body for planting seedlings in a field;
A ground wheel is provided on the machine body and moves up and down in accordance with the undulations of the planting surface of the field;
A vehicle control mechanism including a lifting mechanism that changes the height of the vehicle relative to the wheels so as to maintain a constant height of the vehicle from the planting surface, and a swinging mechanism that swings the vehicle around a longitudinal axis so as to reduce the difference in height between the left and right parts of the vehicle from the planting surface;
Equipped with
The ground contact wheels include a first ground contact wheel provided on a left portion of the aircraft body and a second ground contact wheel provided on a right portion of the aircraft body;
the aircraft control mechanism switches between an interlocking state in which both the lifting mechanism and the swinging mechanism are operating and a non-interlocking state in which either the lifting mechanism or the swinging mechanism is operating, based on a first fluctuation amount that is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount that is a fluctuation amount of the height of the second ground contact wheel ;
The rocking mechanism includes:
A swing cylinder that swings the body around an axis in the front-rear direction by telescopic drive;
A fulcrum axis extending in the vertical direction;
A first moving member is disposed on the left side of the fulcrum shaft and moves in the front-rear direction based on the first fluctuation amount.
The material,
a second moving member disposed on the right side of the fulcrum shaft and moving in a front-rear direction based on the second fluctuation amount;
a connecting member extending in the left-right direction to connect the first moving member and the second moving member, and oscillating about the fulcrum shaft based on a difference between a first movement amount that is a movement amount of the first moving member and a second movement amount that is a movement amount of the second moving member;
a swing cylinder drive mechanism that connects the connecting member and the swing cylinder so as to be interlocked with each other and drives the swing cylinder when a difference between the first movement amount and the second movement amount becomes equal to or greater than a predetermined amount;
It has
The lifting mechanism includes a lifting cylinder that varies the height of the machine body by telescopic drive, the fulcrum shaft, the first moving member, the second moving member, the connecting member, a lifting cylinder drive mechanism that connects the connecting member and the lifting cylinder so as to be interlocked, and a horizontal shaft extending in the left-right direction;
the fulcrum shaft is tilted about the horizontal axis based on an average value of the first movement amount and the second movement amount,
The lift cylinder drive mechanism is a mechanism that drives the lift cylinder when the tilt amount of the fulcrum shaft reaches a certain value or more, and includes a rotating body that can rotate in a first direction to extend the lift cylinder and a second direction to shorten the lift cylinder, a first rotating member connected to a left portion of the connecting member and rotating about the horizontal axis based on the first movement amount, a second rotating member connected to a right portion of the connecting member and rotating about the horizontal axis based on the second movement amount, and a second interlocking mechanism that rotates the rotating body in conjunction with the rotation of the first rotating member and the second rotating member,
The second interlocking mechanism rotates the rotating body based on an average value of the rotation amount of the first rotating member and the rotation amount of the second rotating member . The aircraft and
Wheels that support the vehicle body so that it can run;
A transplanting unit provided on the machine body for planting seedlings in a field;
A ground wheel is provided on the machine body and moves up and down in accordance with the undulations of the planting surface of the field;
A vehicle control mechanism including a lifting mechanism that changes the height of the vehicle relative to the wheels so as to maintain a constant height of the vehicle from the planting surface, and a swinging mechanism that swings the vehicle around a longitudinal axis so as to reduce the difference in height between the left and right parts of the vehicle from the planting surface;
A setting lever for setting the reference height of the ground contact wheel;
Equipped with
The ground contact wheels include a first ground contact wheel provided on a left portion of the aircraft body and a second ground contact wheel provided on a right portion of the aircraft body;
the aircraft control mechanism switches between an interlocking state in which both the lifting mechanism and the swinging mechanism are operating and a non-interlocking state in which either the lifting mechanism or the swinging mechanism is operating, based on a first fluctuation amount that is a fluctuation amount of the height of the first ground contact wheel and a second fluctuation amount that is a fluctuation amount of the height of the second ground contact wheel ;
The rocking mechanism includes:
A swing cylinder that swings the body around an axis in the front-rear direction by telescopic drive;
A fulcrum axis extending in the vertical direction;
a first moving member disposed to the left of the fulcrum shaft and moving in a front-rear direction based on the first fluctuation amount;
a second moving member disposed on the right side of the fulcrum shaft and moving in a front-rear direction based on the second fluctuation amount;
a connecting member extending in the left-right direction to connect the first moving member and the second moving member, and oscillating about the fulcrum shaft based on a difference between a first movement amount that is a movement amount of the first moving member and a second movement amount that is a movement amount of the second moving member;
a swing cylinder drive mechanism that connects the connecting member and the swing cylinder so as to be interlocked with each other and drives the swing cylinder when a difference between the first movement amount and the second movement amount becomes equal to or greater than a predetermined amount;
It has
the setting lever is capable of changing the reference height by swinging,
A transplanter in which the first moving member and the second moving member move the same distance when the setting lever is swung . a switching mechanism for switching between a manual mode in which the lever is manually swung and an automatic mode in which the lever is automatically swung;
5. The transplanter according to claim 4 , wherein the switching mechanism allows the first interlocking mechanism to swing the lever in the automatic mode and does not allow the first interlocking mechanism to swing the lever in the manual mode. A fixed shaft fixed to the airframe and extending in the airframe width direction;
A movable shaft that is swingable relative to the fixed shaft and extends in the aircraft width direction;
Equipped with
The movable shaft includes a first movable shaft connected to the first ground contact wheel so as to be movable in conjunction with the first ground contact wheel, and a second movable shaft connected to the second ground contact wheel so as to be movable in conjunction with the second ground contact wheel,
The first moving member moves in accordance with the swinging of the first movable shaft,
The transplanter according to any one of claims 4 to 7 , wherein the second moving member moves in accordance with the swinging of the second movable shaft.

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