JP2007300827A - Paddy field working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paddy field working machine having a paddy field working device and a ground working device, wherein workability of the ground working device is increased. <P>SOLUTION: A ground working device 53 is supported to be freely drivable to ascend and descend by an actuator 56. An artificially operable manipulation device is provided. The ascended state, in which the ground working device 53 is positioned at the upper position upper than the surface of the rice field, and the descended state, in which the ground work device 53 is positioned at the lower position capable of contacting to the surface of the rice field, are provided to be settable with the manipulation device. When the descended state is set by the manipulation device, the actuator 56 is worked to position the ground work device 53 at the upper position in nonworking state, and, in working state, the actuator 56 is worked to position the ground work device 53 at the lower position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a paddy field work machine (such as a riding type rice planting machine or a riding type direct seeding machine) in which a paddy field working apparatus (such as a seedling planting apparatus or a direct sowing apparatus) is supported at the rear part of the machine body so as to be movable up and down.

  In a riding type rice transplanter which is an example of a paddy field work machine, as disclosed in Patent Document 1, for example, a seedling planting device (corresponding to a paddy field work apparatus) is provided at the rear part of the machine body (see FIGS. 1 and 4 of Patent Document 1). 4) is supported so as to be movable up and down, and a leveling device (corresponding to the ground work device) (25 in FIGS. 1 and 4 of Patent Document 1) is supported so as to be movable up and down in front of the seedling planting device. There is something. Thereby, the seedling planting operation by the seedling planting device can be performed while leveling the surface with the leveling device.

  In Patent Document 1, the leveling device is linked to the seedling planting device by a lifting link (37 in FIG. 1 of Patent Document 1) or the leveling device is connected to the seedling planting device (Patent Document 1). 4), when the seedling planting device is raised, the leveling device is also raised, and when the seedling planting device is lowered, the leveling device is also lowered.

Japanese Utility Model Publication No. 2-116915 (FIGS. 1 and 4)

In Patent Document 1, since the ground work device also moves up and down together with the paddy field work device, when the paddy field work device is lowered and grounded, the ground work device is also grounded, and when the paddy field work device is lifted from the surface, the ground work device and the surface Rise from. In this case, there is room for improvement in terms of workability of the ground work device.
An object of the present invention is to improve workability of a ground work device in a paddy field work machine including a paddy work device and a ground work device.

[I]
(Constitution)
The first feature of the present invention resides in the following configuration in a paddy field machine.
A paddy field work device is supported at the rear of the machine body by an elevating mechanism so as to be movable up and down, and a ground work device is supported by an actuator so as to be driven up and down. An artificial operation tool that can be operated artificially is provided, and the actuator is operated so that the ground work device is located at an upper position above the surface, and the ground work device is located at a lower position where the ground work device can be grounded to the surface. The lowering state in which the actuator is actuated can be set by an artificial operation tool.
It is provided with a discriminating means for discriminating the working state and the non-working state, and the actuator is operated so that the ground work device is positioned in the upper position when the lowering state is set by the human operation tool and in the non-working state. When in the state, a check means for operating the actuator is provided so that the ground work device is positioned at the lower position.

(Function)
According to the first feature of the present invention, if the rising state of the ground work device is set by a human operation tool, the ground work device is positioned at the upper position. Therefore, even if the paddy field work device is lowered and grounded to the paddy field The ground work device is located above the rice field and is not grounded to the rice field. Even if the paddy field work device is lifted from the rice field, the ground work device is similarly located above the rice field and is not grounded to the rice field.

In the paddy field machine, the paddy field machine may be in a non-working state or a working state, even if the paddy field working device is lowered and brought into contact with the field surface.
According to the first feature of the present invention, there is provided a discriminating means for discriminating whether the paddy field work machine is in a working state or a non-working state, and the descending state of the ground work device is set by a human operation tool. In the state, when the non-working state is determined, the ground work device automatically rises to the upper position regardless of the manual operation tool, and even if the paddy work device is lowered and grounded to the surface, the ground work device is It is located above the surface and does not touch the surface.
According to the first aspect of the present invention, when the work state is determined in the state where the ground work device is lowered by the human operation tool, the ground work device is automatically lowered to the lower position according to the human operation tool. Therefore, the ground work device can be grounded to the surface.

  According to the first feature of the present invention, the ground work device is supported by the actuator so as to be movable up and down. Thus, even a relatively heavy ground work device can be driven up and down without difficulty. Since it is possible to configure the human operation tool as an operation switch or a small operation lever, it is possible to lightly operate the human operation tool regardless of the weight of the ground work device, and the human operation tool is arranged at an arbitrary position. Can be done easily.

(The invention's effect)
According to the first feature of the present invention, in a paddy field work machine equipped with a paddy field work device and a ground work device, the ground work device is not in contact with the rice field regardless of whether the paddy field work device is raised or lowered (upward state of the ground work device), A state where the ground work device can be grounded to the surface (when the ground work device is in the lowered state and the paddy field machine is in a working state), and a state where the ground work device is positioned above the surface (the lowered state of the ground work device) In the non-working state of the paddy field machine, the ground work device can be adapted to various situations of the paddy field work machine, and the workability of the ground work device is improved. Was able to improve.

  According to the 1st characteristic of this invention, it is a non-working state by comprising so that a ground work apparatus may raise / lower automatically to an upper position and a lower position according to the working state and non-working state of a paddy field machine. However, the inconvenience caused by grounding the ground work device to the surface can be avoided, and the workability of the ground work device can be improved.

  According to the first feature of the present invention, the ground work device is supported by the actuator so that it can be lifted and lowered, so that even a relatively heavy ground work device can be driven up and down without difficulty. The operability of raising and lowering the ground work device can be improved by the fact that the operation can be performed lightly and the manipulating operation tool can be easily arranged at an arbitrary position.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the paddy field working machine of the first feature of the present invention.
The discriminating means is configured to discriminate that the working clutch capable of transmitting and shutting power to the paddy field working device is in the working state, and to judge that the working clutch is in the non-working state when the working clutch is in the shutting state.

(Function)
According to the second feature of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention, and in addition to this, the following “action” is provided.
In a riding type rice transplanter, which is an example of a paddy field work machine, for example, a single planting process (a planting clutch (corresponding to a work clutch) that transmits power to a seedling planting device is operated in a transmission state and seedling planting is performed. When the planting of the seedlings is completed and the dredging is reached, the planting clutch is operated in a disengaged state to stop the seedling planting device and raise it from the paddy surface, and start turning at the brimming. When the turning at the end of the heel is finished, the seedling planting device is lowered to the surface, and the planting clutch is operated in the transmission state to enter the next planting process.

  Thus, in the paddy field machine, if the work clutch is in the transmission state, it can be determined that the paddy field machine is in the work state. If the work clutch is in the disconnected state, the paddy field machine is in the non-working state. Therefore, according to the second feature of the present invention, the ground work device can be automatically and appropriately positioned at the lower and upper positions according to the transmission and disengagement state of the work clutch.

  In the riding type rice transplanter, when turning at the shore as described above, when reaching the middle of the turning at the shore, the seedling planting device is lowered to the rice field while maintaining the planting clutch in the disconnected state, With the float of the seedling planting device in contact with the rice field, continue turning at the heel in this state, and when turning at the shore is finished, operate the planting clutch to the transmission state and proceed to the next planting process. There are things to enter. Thus, the ground of the seedling planting device can be grounded by the float of the seedling planting device by grounding the float of the seedling planting device while maintaining the planting clutch in the disengaged state and performing the turning at the beach side. .

  In this case, according to the second feature of the present invention, even if the paddy field work device is lowered to the surface in the middle of turning at the shore, the work clutch is in the disengaged state, so the ground work device is located at the upper position. Is not grounded. As a result, when the ground work device is lowered to the paddy surface in the middle of turning at the shore, the inconvenience caused by positioning the ground work device in the lower position even though it is in a non-working state (for example, paddy field work device Further, by turning at the shore while the ground work device is in contact with the field surface, it is possible to avoid a situation in which mud on the surface is swept away by the ground work device.

(The invention's effect)
According to the second feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the second feature of the present invention, the working state and the non-working state can be discriminated by the transmission and disengagement state of the work clutch, and the ground work device can be automatically raised and lowered to the lower and upper positions appropriately, and The inconvenience of placing the ground work device in the lower position even in the non-working state can be avoided, so that the workability of the ground work device can be improved.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the paddy field working machine of the first feature of the present invention.
The discriminating means is configured to discriminate that it is in the working state if the traveling speed of the airframe is the working traveling speed, and to determine that it is in the non-operating state if the traveling speed of the airframe is the non-working traveling speed.

(Function)
According to the third feature of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention, and in addition to this, the following “action” is provided.
A paddy field machine often travels at a predetermined work traveling speed suitable for a paddy field work apparatus when working in a paddy field. On the other hand, when moving on the road, the vehicle often travels at a speed higher than the work travel speed, and is slower than the work travel speed when turning on the beach or entering or leaving the paddy field over the fence. Often run at the side speed.

  Thus, in the paddy field machine, if the traveling speed of the machine body is the working traveling speed, it can be determined that the paddy field working machine is in a working state, and if the traveling speed of the machine body is the non-working traveling speed, Since it can be determined that it is in the work state, according to the third feature of the present invention, the ground work device can be appropriately and automatically positioned at the lower and upper positions according to the traveling speed of the aircraft.

(The invention's effect)
According to the third feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the third feature of the present invention, the ground working device can be appropriately and automatically positioned at the lower and upper positions by determining the working state and the non-working state based on the traveling speed of the airframe. The workability of the working device could be improved.

[IV]
(Constitution)
The fourth feature of the present invention resides in the following configuration in the paddy field working machine of the first feature of the present invention.
If the steering angle of the freely steerable front wheel is within the range of the right and left set angles from the straight-ahead position, it is determined that it is in the working state, and the steering angle of the front wheels sets the right and left set angles. The discrimination means is configured to discriminate that it is in a non-working state if it is located on the right and left sides beyond.

(Function)
According to the fourth feature of the present invention, the “action” described in the preceding item [I] is provided similarly to the first feature of the present invention, and in addition to this, the following “action” is provided.
As described in the preceding paragraph [II], in a riding type rice transplanter that is an example of a paddy field work machine, for example, when one planting process is completed and the culmination is reached, the seedling planting device is raised from the rice field. Then, turn the front wheel to the right or left to start turning on the heel. When the turn at the end of the coast is finished, the front wheel is moved back to the vicinity of the straight running position, the seedling planting device is lowered to the rice field, and the next planting process is started.

  Thereby, in the paddy field work machine, if the steering angle of the front wheels is located within the range of the right and left set angles from the straight traveling position, it can be determined that the paddy field work machine is in a working state. According to the fourth feature of the present invention, if the steering angle of the front wheels is located on the right and left sides beyond the right and left set angles, the paddy field machine can be determined to be in a non-working state. Depending on the steering angle of the front wheels, the ground work device can be automatically and appropriately positioned at the lower and upper positions.

(The invention's effect)
According to the fourth feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the fourth feature of the present invention, by determining the working state and the non-working state based on the steering angle of the front wheels, the ground work device can be appropriately and automatically positioned at the lower and upper positions, The workability of the ground work equipment could be improved.

[V]
(Constitution)
A fifth feature of the present invention resides in the following configuration in any one of the paddy field working machines of the first to fourth features of the present invention.
The check means is configured so that the actuator is operated and the ground work device is positioned at the lower position after a set time has elapsed since the switching from the non-working state to the working state.

(Function)
According to the fifth aspect of the present invention, the “action” described in the preceding paragraphs [I] to [IV] is provided similarly to any one of the first to fourth characteristics of the present invention. It has the following “actions”.
When the paddy field work machine is switched from the non-working state to the working state, it may take some time until the work by the paddy field working device becomes stable. Therefore, according to the fifth feature of the present invention, the work of the paddy field working device is stable. After that, the ground work device is located at the lower position and the work is started.

(The invention's effect)
According to the fifth feature of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [IV] is provided as in any one of the first to fourth features of the present invention. In addition, the following “effects of the invention” are provided.
According to the fifth aspect of the present invention, since the ground work device is positioned at the lower position after the work of the paddy field work device is stabilized, the work is started before the work of the paddy field work device is stabilized. The inconvenience caused by the work device being positioned at the lower position can be avoided, and the workability of the ground work device can be improved.

[VI]
(Constitution)
A sixth feature of the present invention resides in the following configuration in any one of the paddy field working machines of the first to fifth features of the present invention.
In a state where the lowered state is set by the human operating tool and the actuator is operating so that the ground work device is positioned at the lower position due to the working state, the raised state is set by the human operating tool. The actuator is operated in preference to the restraining means so that the ground work device is positioned at the upper position.

(Function)
According to the sixth aspect of the present invention, the “action” described in the preceding paragraphs [I] to [V] is provided in the same manner as any one of the first to fifth aspects of the present invention. It has the following “actions”.
According to the sixth aspect of the present invention, when the ground work device is located at the lower position and is in contact with the paddy field, for example, when the ground work device is clogged with mud or the like, the human operation tool By setting the lifted state, the ground work device can be positioned in the upper position, and malfunction of the ground work device can be avoided.

(The invention's effect)
According to the sixth aspect of the present invention, as in any one of the first to fifth aspects of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [V] is provided. In addition, the following “effects of the invention” are provided.
According to the sixth feature of the present invention, in the state where the ground work device is positioned at the lower position and is in contact with the surface, the ground work device can be arbitrarily positioned at the upper position by the artificial operation tool. The malfunction of the ground work device can be avoided, and the workability of the ground work device can be improved.

[VII]
(Constitution)
A seventh feature of the present invention resides in the following configuration in any one of the paddy field working machines according to the first to sixth features of the present invention.
Forced lowering means is provided for operating the actuator so that the ground work device is positioned at a lower position in preference to the check means.

(Function)
According to the seventh aspect of the present invention, in addition to any one of the first to sixth characteristics of the present invention, the “action” described in the preceding paragraphs [I] to [VI] is provided. It has the following “actions”.
According to the seventh feature of the present invention, even if the paddy field work machine is in a non-working state, the ground work device is positioned at the lower position by the forced lowering means according to the situation of the paddy field work machine, and the ground work device is placed on the surface. Can be grounded. Thereby, in a non-working state of the paddy field work machine, it is possible to obtain a state in which the ground work device is grounded to the paddy surface and the ground work is performed.

(The invention's effect)
According to the seventh feature of the present invention, as in any one of the first to sixth features of the present invention, the “effect of the invention” described in the preceding paragraphs [I] to [VI] is provided. In addition, the following “effects of the invention” are provided.
According to the seventh feature of the present invention, in a non-working state of the paddy field work machine, it is possible to obtain a state in which the ground work device is grounded on the surface of the paddy field work so that the ground work is performed. It became possible to cope with various situations, and the workability of the ground work device could be improved.

[1]
As shown in FIG. 1, a six-row type seedling planting device 5 (corresponding to a paddy field work device) is connected to the rear part of the machine body supported by the right and left front wheels 1 and the right and left rear wheels 2 by a link mechanism 3. ) Is supported so as to be movable up and down, and a hydraulic cylinder 4 (corresponding to a lifting mechanism) that drives the link mechanism 3 to move up and down is provided to constitute a riding type rice transplanter that is an example of a paddy field work machine.

Next, the seedling planting device 5 will be described.
As shown in FIGS. 1, 2, and 4, the seedling planting device 5 includes one feed case 17, three transmission cases 6, and a pair of rotation cases 7 that are rotatably supported at the rear part of the transmission case 6. , A pair of planting arms 8 provided at both ends of the rotating case 7, a center center float 9 and side floats 11, a seedling platform 10 which is provided with six seedling mounting surfaces and is reciprocally laterally driven in the horizontal direction. A vertical feed mechanism 25 and the like provided on each of the seedling setting surfaces of the seedling setting table 10 are provided. A feed case 17 and a transmission case 6 are fixed to a support frame 18 arranged in the left-right direction, and the feed case 17 is supported so as to be able to roll around a front and rear axis P1 (see FIG. 3) at the rear lower portion of the link mechanism 3. (Seedling planting device 5 is supported so as to be able to roll around front and rear axis P1 at the lower rear portion of link mechanism 3).

  As shown in FIG. 4, the transverse feed shaft 19 extends from the feed case 17, and the end of the transverse feed shaft 19 is supported by the support frame 18 via the support member 20, and as the transverse feed shaft 19 rotates. A feed member 21 that is driven to reciprocate laterally is fitted on the transverse feed shaft 19, and the feed member 21 is connected to the seedling table 10. A guide rail 38 is supported by the transmission case 6 in the left-right direction, and a lower portion of the seedling bed 10 is supported along the guide rail 38 so as to be laterally movable. As shown in FIGS. 2 and 3, the support member 26 is fixed to the right and left ends of the support frame 18 and extends upward, and the support member 50 is fixed over the upper portion of the support member 26. The guide rail 27 is fixed to the front surface of the upper part of the seedling raising base 10, and the guide rail 27 is supported by the roller 51 supported by the support member 50 so as to be laterally movable.

  As shown in FIGS. 1 and 4, the power of the engine 49 is transmitted to the input shaft 28 provided in the feed case 17 through the planting clutch 87 (corresponding to a working clutch) (see FIG. 7) and the PTO shaft 22. The power of the input shaft 28 is transmitted to the lateral feed shaft 19 via the lateral feed speed change mechanism 29, and the lateral feed shaft 19 is rotationally driven. The power of the input shaft 28 is transmitted to the transmission chain 30, the transmission shaft 23 installed across the transmission case 6, and the input shaft 32 provided in the transmission case 6, and the power of the input shaft 32 is transmitted to the torque limiter 33, the transmission The rotation is transmitted to the rotary case 7 through the chain 34, the small number of clutches 24, and the drive shaft 35. A cylindrical cover 60 is fixed over the transmission case 6, and the transmission shaft 23 is covered by the cover 60.

  As a result, when the planting clutch 87 is operated in the transmission state (corresponding to the working state), the rotating case 7 is counterclockwise as shown in FIG. The planting arm 8 alternately takes out seedlings from the lower part of the seedling platform 10 and plantes them on the rice field G. When the planting clutch 87 is operated in a disconnected state (corresponding to a non-working state), the reciprocating lateral feed drive of the seedling bed 10 and the rotational drive of the rotary case 7 are stopped.

  As shown in FIG. 2, a belt-type vertical feed mechanism 25 is provided on each of the six seedling setting surfaces of the seedling setting table 10. As shown in FIG. 4, the longitudinal feed shaft 36 extends from the feed case 17, the end of the longitudinal feed shaft 36 is supported by the support frame 18 via the support member 37, and the longitudinal feed is performed by the power of the input shaft 28. The shaft 36 is rotationally driven, and a pair of drive arms 36 a are fixed to the longitudinal feed shaft 36. An input unit (not shown) for transmitting power to the six vertical feed mechanisms 25 is provided in the seedling bed 10, and the input unit is located between the drive arms 36 a of the vertical feed shaft 36. As a result, when the seedling bed 10 reaches the right or left end of the reciprocating lateral feed drive, the input portion reaches one drive arm 36a of the vertical feed shaft 36 and is input by one drive arm 36a of the vertical feed shaft 36. The parts are driven, and the seedlings on the seedling table 10 are sent downward by the six vertical feeding mechanisms 25.

  As shown in FIG. 1 and FIG. 2, a hopper 12 for storing fertilizer and three feeding portions 13 corresponding to two planting strips are provided on the rear side of the driver seat 31. A blower 14 is provided on the side. Two groovers 15 are fixed to the center float 9 and the side float 11, and six groovers 15 are provided. Six hoses 16 extend between the feeding portion 13 and the groover 15. Is connected. As a result, the fertilizer is fed from the hopper 12 by a predetermined amount by the feeding section 13 along with the seedling planting as described above, and the fertilizer is supplied to the groove producing device 15 through the hose 16 by the blower 14 blowing. Yes, fertilizer is supplied to the rice field G via the grooving device 15.

  As shown in FIG. 7, the feeding portion 13 is provided with a fertilizing clutch 90 that can transmit and shut the power freely, and an electric motor 91 that operates the fertilizing clutch 90 in a transmitting and shutting state, and transmits the planting clutch 87. And the electric motor 89 which operates to the interruption | blocking state is provided. Thereby, the operation of the seedling planting device 5 (planting of seedlings by the planting arm 8) and the feeding portion 13 is performed by operating the planting clutch 87 and the fertilization clutch 90 to the transmission and shut-off state by the electric motors 89 and 91. Stop.

[2]
Next, the planting control means of the seedling planting device 5 will be described.
As shown in FIGS. 2, 5, and 7, a support shaft 41 is rotatably supported around the horizontal axis P <b> 4 at the lower portion of the transmission case 6, and a support arm 41 a fixed to the support shaft 41 extends rearward. The rear portions of the center float 9 and the side float 11 are supported so as to be swingable up and down around the horizontal axis P5 at the rear end of the support arm 41a. As shown in FIGS. 3 and 7, an artificially operable planting set height lever 42 is fixed to the support shaft 41 and extends forward and upward, and a lever guide 43 fixed to the support frame 18. A planting setting height lever 42 is inserted into the plant.

  As shown in FIGS. 5 and 7, the support shaft 41 and the support arm 41 a are rotated by the planting setting height lever 42, and the position of the horizontal axis P <b> 5 (center float 9 and side float 11) is moved up and down. By changing, the planting set height A1 (set depth) described later can be changed. By engaging the planting set height lever 42 with the lever guide 43, the horizontal axis P5 ( The planting set height A1 (set depth) can be set by fixing the positions of the center float 9 and the side float 11).

  As shown in FIG. 7, a potentiometer 44 that detects the angle of the support shaft 41 is fixed to the support frame 18, and a detection value of the potentiometer 44 is input to the control device 40. By detecting the angle of the support shaft 41 with the potentiometer 44, the position of the horizontal axis P5 (center float 9 and side float 11) can be detected, and the planting setting height lever 42 is used as described above. When the planting setting height A1 (setting depth) is set, the planting setting height A1 (setting depth) is recognized by the control device 40 based on the detection value of the potentiometer 44.

  As shown in FIGS. 5 and 7, the bracket 45 is fixed to the support frame 18 above the center float 9, and the potentiometer 68 is fixed to the bracket 45, and the detection arm 68 a of the potentiometer 68 and the front part of the center float 9 The rod 69 is connected over the. A spring 86 that biases the detection arm 68a of the potentiometer 68 downward is provided, and the front portion of the center float 9 is biased downward by the spring 86, and the detection value of the potentiometer 68 is input to the control device 40. Yes. An artificially operable dial type sensitivity setting switch 70 is provided, and an operation position of the sensitivity setting switch 70 is input to the control device 40.

  The state shown in FIGS. 5 and 7 is a state in which the position of the horizontal axis P5 (center float 9 and side float 11) is set by the planting setting height lever 42, and based on the detection value of the potentiometer 44, The planting set height A1 (set depth) corresponding to the position of the shaft core P5 (center float 9 and side float 11) is set to the detection value of the potentiometer 68. In this state, for example, the detection value of the potentiometer 68 where the bottom surface of the center float 9 is horizontal is set as the set detection value B1 corresponding to the planting setting height A1 (setting depth).

  In the state shown in FIGS. 5 and 7, the center float 9 follows the ground surface G while the seedling planting device 5 moves up and down, and accordingly, seedling planting from the surface G (center float 9). The height to the device 5 (planting depth of the seedling by the planting arm 8) tends to change. As a result, the height from the surface G (center float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) is detected by the potentiometer 68, and the detection value of the potentiometer 68 is set and detected. A control valve 71 for supplying and discharging hydraulic oil to and from the hydraulic cylinder 4 is operated by the control device 40 so that the value B1 (planting set height A1 (set depth)) is reached. 5 is driven up and down, and the planting depth of the seedlings by the seedling planting device 5 (planting arm 8) is maintained at the set depth (planting control means).

  5 and 7, when the position of the horizontal axis P5 (center float 9 and side float 11) is changed by the planting setting height lever 42, a new planting setting height A1 (setting depth) is obtained. Is set. Accordingly, based on the detection value of the potentiometer 44, for example, the detection value of the potentiometer 68 where the bottom surface of the center float 9 is horizontal is a new setting corresponding to the above-mentioned new planting setting height A1 (setting depth). This is set as the detection value B1, so that the seedling planting depth by the seedling planting device 5 (planting arm 8) can be changed.

  In this case, the setting detection value B1 (planting setting height A1 (setting depth)) can be slightly changed by the sensitivity setting switch 70. When the sensitivity setting switch 70 is operated to the neutral position N between the sensitive side and the insensitive side, the setting detection value B1 (planting setting height A1 (setting depth)) is not changed (planting setting height). With the position of the horizontal axis P5 (center float 9 and side float 11) set by the lever 42, the set detection value B1 (planting setting) corresponding to the position of the horizontal axis P5 (center float 9 and side float 11) State in which height A1 (set depth)) is set).

  When the sensitivity setting switch 70 is operated from the neutral position N to the sensitive side, the setting detection value B1 (planting setting height A1 (setting depth)) shown in FIG. 7 is slightly corresponding to the operation position of the sensitivity setting switch 70. Changed to low side. As a result, the bottom surface of the center float 9 at the set detection value B1 (planting set height A1 (set depth)) is slightly downward, the contact area of the center float 9 to the surface G increases, and the center float 9 Therefore, the raising and lowering drive of the seedling planting device 5 by the hydraulic cylinder 4 is set to be sensitive.

  When the sensitivity setting switch 70 is operated from the neutral position N to the insensitive side, the setting detection value B1 (planting setting height A1 (setting depth)) shown in FIG. 7 slightly corresponds to the operation position of the sensitivity setting switch 70. Changed to high side. As a result, the bottom surface of the center float 9 at the planting set height A1 (set depth) is slightly upward, the contact area of the center float 9 to the surface G is reduced, and the center float 9 is insensitive to the surface G. Since it follows, the raising / lowering drive of the seedling planting device 5 by the hydraulic cylinder 4 is set to be insensitive.

[3]
Next, the rolling control means of the seedling planting device 5 will be described.
As shown in the description in [1] and FIG. 3, the feed case 17 is supported so as to be able to roll around the front and rear axis P <b> 1 at the rear lower part of the link mechanism 3 (the seedling planting device 5 is the rear part of the link mechanism 3. It is supported so as to be able to roll around the lower front and rear axis P1). As shown in FIGS. 3 and 7, the tilt sensor 48 is fixed to the feed case 17, and the tilt angle in the left-right direction of the seedling planting device 5 with respect to the horizontal plane (field G) is detected by the tilt sensor 48. The detection value of the sensor 48 is input to the control device 40.

  As shown in FIG. 3, a rolling mechanism 46 is provided at the upper rear portion of the link mechanism 3. The rolling mechanism 46 is a pair of wires 46a that are pushed and pulled in the left-right direction, and a gear mechanism that pushes and pulls the wires 46a. (Not shown) and an electric motor 46b. A bracket 27 a is fixed to the right and left ends of the guide rail 27, and a spring 47 is connected between the arm 46 c fixed to the rolling mechanism 46 and the bracket 27 a of the guide rail 27. A spring 39 is connected across the wire 46 a and the right and left side portions of the support member 50.

  As a result, as shown in the preceding item [1] and FIG. 3, the right or left spring 47 is extended as the seedling setting table 10 is driven to reciprocate laterally, and the seedling setting table 10 is moved to the right. When driven laterally (left), the right (left) spring 47 is stretched, and the urging force of the right (left) spring 47 causes the seedling planting device 5 to tilt to the right (left). It can be suppressed. The inclination angle of the right and left direction of the seedling planting device 5 with respect to the horizontal plane (rice surface G) is detected by the inclination sensor 48 so that the seedling planting device 5 is maintained horizontal (parallel to the rice field G and the left and right direction). As described above, the electric motor 46b of the rolling mechanism 46 is operated by the control device 40, the wire 46a of the rolling mechanism 46 is pushed and pulled, and the seedling planting device 5 is driven to roll around the longitudinal axis P1. (Rolling control means).

[4]
Next, the leveling device 53 (corresponding to the ground work device) will be described.
As shown in FIGS. 2, 3, and 4, the boss member 64 is fixed to the left end portion of the support frame 18, and the transmission case 81 is attached to the boss member 64 around the horizontal axis P <b> 2 of the transmission shaft 23 and the input shaft 32. It is supported so that it can swing up and down. A bracket 82 is fixed to the right end of the support frame 18, and a support arm 83 is swingably supported around the horizontal axis P <b> 2 of the bracket 82 (the horizontal axis P <b> 2 of the transmission shaft 23 and the input shaft 32). The drive shaft 61 having a square cross section is rotatably supported across the transmission case 81 and the support arm 83.

  As shown in FIG. 6, a small-width rotating body 62 is integrally formed of synthetic resin. The rotating body 62 includes a boss portion 62a, a mounting hole 62b having a square cross section formed in the boss portion 62a, a flange portion 62c connected to the boss portion 62a, and a convex leveling portion 62d connected to the outer peripheral portion of the flange portion 62c. It is configured with. The drive shaft 61 is also configured to have the same square cross section as the mounting hole 62b of the rotating body 62. As shown in FIGS. 3, 4, and 5, the drive shaft 61 is inserted into the boss portions 62 a (mounting holes 62 b) of the large number of rotating bodies 62, and the rotating body 62 is fixed to the driving shaft 61. A spacer 63 is externally fitted to the position of the rotating body 62.

  As shown in FIGS. 2, 3, and 4, the bracket 65 is fixed to the transmission case 81 and the support arm 83, and the synthetic resin cover 66 is disposed outside the transmission case 81 and the support arm 83. And it is fixed to the bracket 65 of the support arm 83. A round pipe-shaped support frame 67 is fixed across the transmission case 81 and the bracket 65 of the support arm 83, and a synthetic resin cover 66 is fixed to the support frame 67. The cover 66 is a relatively soft thin plate and is located behind the rotating body 62, and the lower end portion of the outer peripheral portion of the rotating body 62 and the lower end portion of the cover 66 are located at substantially the same height.

  As described above, as shown in FIGS. 2, 3, and 4, the leveling device 53 is configured by the drive shaft 61, the rotating body 62, the cover 66, the support frame 67, the transmission case 81, the support arm 83, and the like. The leveling device 53 is supported on the front part of the seedling planting device 5 (center float 9 and side float 11), the leveling device 53 is arranged behind the rear wheel 2, and the transmission case 81 and the support arm 83 are on the horizontal axis. By leveling up and down around the core P2, the leveling device 53 is supported by the seedling planting device 5 so as to be movable up and down.

[5]
Next, the drive structure and the lift drive structure of the leveling device 53 will be described.
As shown in FIG. 4, the transmission shaft 75 connected to the input shaft 32 is disposed inside the boss member 64 and the transmission case 81. Inside the transmission case 81, a sprocket 78 is fitted on the transmission shaft 75 so as to be relatively rotatable, a sprocket 79 is fixed to the drive shaft 61, and a transmission chain 80 is wound around the sprockets 78, 79. A torque limiter 77 is provided between the transmission shaft 75 and the sprocket 78.

  As shown in the preceding item [1], FIG. 1 and FIG. 4, the power of the engine 49 is transmitted to the input shaft 28, the transmission chain 30, the transmission shaft 23 and the input shaft 32 via the planting clutch 87 and the PTO shaft 22. Then, the power of the input shaft 32 is transmitted to the drive shaft 61 (leveling device 53) via the transmission shaft 75, the torque limiter 77, and the transmission chain 80, and the drive shaft 61 and the rotating body 62 (leveling device 53) are illustrated. 2 is driven to rotate in the counterclockwise direction.

  In this case, the drive shaft 61 and the rotating body 62 (leveling device 53) are rotationally driven at a speed higher than the traveling speed of the machine body (the outer periphery of the rotating body 62 is higher than the peripheral speed of the outer peripheral portion of the right and left rear wheels 2). The drive shaft 61 and the rotator 62 (grading device 53) are rotationally driven at a high speed so that the peripheral speed of the part becomes high). As a result, the front surface G of the planting arm 8 is leveled (scraped) by the drive shaft 61 and the rotating body 62 (grading device 53), and is rearward from the driving shaft 61 and the rotating body 62 (grading device 53). Mud scattering to the seedling planting device 5 is stopped by the cover 66.

  Thereby, by operating the planting and fertilization clutches 87, 90 to the transmission and shut-off state by the electric motors 89, 91, the operation of the seedling planting device 5 (planting of seedlings by the planting arm 8) and the feeding unit 13 and Simultaneously with the stop, the drive shaft 61 and the rotating body 62 (grading device 53) are actuated and stopped. When a large load is generated on the drive shaft 61 and the rotary body 62 (leveling device 53) due to foreign matter such as stones being caught in the drive shaft 61 or the rotary body 62 (leveling device 53), the drive shaft is driven by the torque limiter 77. The power to 61 and the rotating body 62 (leveling device 53) is cut off, and the drive shaft 61 and the rotating body 62 (leveling device 53) stop.

  As shown in FIGS. 2, 3, and 5, the support frame 52 is fixed to the support frame 18 so as to be positioned on the left side of the link mechanism 3, and a fan-shaped elevating gear 54 around the horizontal axis P <b> 3 of the support frame 52. Is fixed to the support frame 52, and a pinion gear 55a of the gear mechanism 55 is fixed to the support frame 52. The gear mechanism 55 having a pinion gear 55a and an electric motor 56 (equivalent to an actuator) for driving the gear mechanism 55 are fixed to the support frame 52. Meshes with the lifting gear 54. At the center of the drive shaft 61 (leveling device 53), a boss member 57 is externally fitted to the drive shaft 61 (leveling device 53) so as to be relatively rotatable by a bearing (not shown). The rod 58 is connected over the. A spring 59 is connected across the transmission case 81 and the bracket 65 of the support arm 83 and the support member 26, and the leveling device 53 is biased upward by the biasing force of the spring 59.

  2, 3, and 5, the pinion gear 55 a of the gear mechanism 55 is rotated forward and backward by the electric motor 56, and the elevating gear 54 is driven to swing up and down around the horizontal axis P 3 as shown in FIGS. Thus, the leveling device 53 (the drive shaft 61 and the rotating body 62) is driven up and down with respect to the seedling planting device 5. In this case, even if the seedling planting device 5 (center float 9 and side float 11) is in contact with the surface G as shown in FIG. 7, the leveling device 53 (drive shaft 61 and rotating body 62) is located above the surface G. And when the seedling planting device 5 (center float 9 and side float 11) is in contact with the table surface G, the leveling device 53 (drive shaft 61 and rotating body 62) is also connected to the table surface G. The leveling device 53 (the drive shaft 61 and the rotating body 62) can be driven up and down by the electric motor 56 in the lowered state positioned at the lower position A4 that contacts the ground.

  As shown in FIGS. 5 and 7, the potentiometer 74 is fixed to the support frame 52 so as to be positioned on the horizontal axis P3, and the potentiometer 74 and the lift gear 54 are connected, and the detection value of the potentiometer 74 is controlled. It is input to the device 40. Thereby, the height of the leveling device 53 (the drive shaft 61 and the rotating body 62) with respect to the seedling planting device 5 is detected by detecting the angle of the elevating gear 54 with respect to the support frame 52 by the potentiometer 74.

[6]
Next, the leveling control means of the leveling device 53 will be described.
As shown in the preceding item [2], FIG. 5 and FIG. 7, the detection value of the potentiometer 68 is set to the set detection value B1 (planting set height A1 (set depth)) (table G (center float 9)) To the seedling planting device 5 (so that the planting depth of the seedling by the planting arm 8) is the planting set height A1 (set depth)), and the hydraulic cylinder 4 serves as a seedling planting device. 5 is driven up and down, the potentiometer 74 detects the height of the leveling device 53 (the drive shaft 61 and the rotating body 62) with respect to the seedling planting device 5, and the leveling device 53 (for example, the axis of the drive shaft 61) is detected from the surface G. The height up to the position of the core is calculated by the control device 40.

  As shown in FIG. 7, an artificially operable dial-type leveling setting switch 84 is provided, and an operation position of the leveling setting switch 84 is input to the control device 40, and the leveling setting switch 84 is operated. Thus, the leveling set height A2 (leveling depth) can be arbitrarily set.

  As a result, as shown in FIG. 7 and FIG. 7, seedling planting from the rice field G (center float 9) so that the detection value of the potentiometer 68 becomes the set detection value B1 (planting setting height A1 (setting depth)). The planting device 5 is moved up and down by the hydraulic cylinder 4 so that the height to the planting device 5 (the planting depth of the seedling by the planting arm 8) is the planting set height A1 (set depth). When the leveling set height A2 (leveling depth) is set by the leveling setting switch 84 in the driven state, the height from the surface G to the leveling device 53 (for example, the position of the axis of the drive shaft 61) is the leveling set height. The electric motor 56 is operated and operated by the control device 40 so that the height becomes A2 (leveling depth), and the leveling device 53 (the drive shaft 61 and the rotating body 62) is driven up and down with respect to the seedling planting device 5. (Leveling control means).

  As shown in the preceding item [2] and FIG. 7, the position of the horizontal axis P5 (center float 9 and side float 11) is changed by the planting setting height lever 42 (seedling planting device 5 (planting arm 8). ), The planting depth of the seedling is changed), and when a new set detection value B1 (planting set height A1 (set depth)) is set, the detection value of the potentiometer 68 becomes the new set detection value. The height from the rice field G (center float 9) to the seedling planting device 5 (planting depth of seedlings by the planting arm 8) is set to B1 (planting set height A1 (set depth)). The seedling planting device 5 is driven up and down by the hydraulic cylinder 4 so that the planting setting height A1 (set depth) is reached. Along with this, the height from the surface G to the leveling device 53 (for example, the position of the axis of the drive shaft 61) changes.

  In this case, as shown in FIG. 7, in the state where the leveling set height A2 (leveling depth) is set by the leveling setting switch 84, the leveling device 53 (for example, the axis of the axis of the drive shaft 61) from the surface G as described above. When the height up to (position) changes, based on the detection value of the potentiometer 44, the leveling device 53 (for example, from the surface G corresponding to the new setting detection value B1 (planting setting height A1 (setting depth))) The electric motor 56 is operated by the control device 40 so that the height to the position of the shaft center of the drive shaft 61 becomes the leveling set height A2 (leveling depth), and the leveling device 53 (the driving shaft 61 and The rotating body 62) is driven up and down with respect to the seedling planting device 5 (leveling control means).

As shown in FIG. 7, when the set detection value B1 (planting set height A1 (set depth)) is changed to the upper side (planting depth of seedlings by the seedling planting device 5 (planting arm 8)). Is changed to the shallow side), the position of the leveling device 53 (the drive shaft 61 and the rotating body 62) is changed downward with respect to the seedling planting device 5, and the leveling device 53 (for example, the drive shaft) is changed from the surface G. The height up to 61 (position of the axis) is maintained at the leveling set height A2 (leveling depth).
As shown in FIG. 7, when the set detection value B1 (planting set height A1 (set depth)) is changed to the lower side (planting depth of seedlings by the seedling planting device 5 (planting arm 8)) Is changed to the deep side), the position of the leveling device 53 (the drive shaft 61 and the rotating body 62) is changed upward with respect to the seedling planting device 5, and the leveling device 53 (for example, drive) The height up to the position of the axis of the shaft 61 is maintained at the leveling set height A2 (leveling depth).

  As shown in FIG. 7, when the sensitivity setting switch 70 is operated to the neutral position N between the sensitive side and the insensitive side, the leveling set height A2 (leveling depth) set by the leveling setting switch 84 is maintained. Is done. When the sensitivity setting switch 70 is operated from the neutral position N to the sensitive side, the setting detection value B1 (planting setting height A1 (setting depth)) is slightly changed to the lower side as described in [2] above. In addition to the fact that the raising / lowering drive of the seedling planting device 5 by the hydraulic cylinder 4 is set to be sensitive, the leveling setting height A2 (leveling depth) corresponding to the operation position of the leveling setting switch 84 is slightly higher. It is changed (state where the leveling depth of the leveling device 53 (the drive shaft 61 and the rotating body 62) becomes shallow).

  As shown in FIG. 7, when the sensitivity setting switch 70 is operated from the neutral position N to the insensitive side, the set detection value B1 (planting setting height A1 (setting depth)) is set as described in [2] above. In addition to being changed to a slightly higher side, the raising / lowering drive of the seedling planting device 5 by the hydraulic cylinder 4 is set to be insensitive, and the leveling set height A2 (leveling) corresponding to the operating position of the leveling setting switch 84 (Depth) is changed to a slightly lower side (state where the leveling depth of the leveling device 53 (the drive shaft 61 and the rotating body 62) becomes deep).

[7]
Next, the raising / lowering drive by the hydraulic cylinder 4 of the seedling planting device 5 and the raising / lowering drive (up) by the electric motor 56 of the leveling device 53 will be described with reference to FIG.
As shown in FIG. 7, an operation lever 73 is provided on the lower right side of the steering handle 88 that steers the front wheel 1, and an elevating lever 76 is provided on the lower left side of the steering handle 88. The operation lever 73 can be operated to the upper position U1, the lower position D1, and the neutral position N, and is biased to the neutral position N. The operation position of the operation lever 73 is input to the control device 40. The elevating lever 76 can be operated to the upper position U2 and the lower position D2, and the operating position of the elevating lever 76 is input to the control device 40. A planting clutch sensor 85 (corresponding to a discriminating means) that detects that the planting clutch 87 is in a transmission and disconnected state is provided, and a detection value of the planting clutch sensor 85 is input to the control device 40.

Suppose that it was in the middle of one planting process K1, as shown in FIG. In the middle of one planting stroke K1, the planting clutch 87 is operated in the transmission state, the seedling planting device 5 and the leveling device 53 are operating, and in one planting stroke K1,
As shown in the preceding paragraphs [2] and [6] and FIG. 7, the detection value of the potentiometer 68 is set to the set detection value B1 (planting set height A1 (set depth)) (table G (center float 9)) To the seedling planting device 5 (so that the planting depth of the seedling by the planting arm 8) is the planting set height A1 (set depth), and the seedling planting device 5 is driven up and down (The operating state of the planting control means)
The leveling device 53 moves up and down with respect to the seedling planting device 5 so that the height from the surface G to the leveling device 53 (for example, the position of the axis of the drive shaft 61) becomes the leveling set height A2 (leveling depth). Driven state (operation state of the leveling control means) (lower position A4) (lower position D2 of the lifting lever 73),
The seedling planting device 5 and the leveling device 53 roll around the longitudinal axis P1 so that the seedling planting device 5 and the leveling device 53 are maintained horizontally (so as to be maintained parallel to the field G in the left-right direction). It is in a driven state (an operating state of the rolling control means).

  As shown in FIG. 10, when the planting process K1 is completed and the heel is reached (position KK1), when the operation lever 73 is operated to the upper position U1 (operated to the upper position U1 to the neutral position). (Step S1), the planting and fertilization clutches 87, 90 are operated in a disconnected state (the seedling planting device 5, the feeding unit 13, and the leveling device 53 are stopped) (step S2), 2] The planting control means and rolling control means described in [3] are stopped (Step S3), and the leveling control means described in [6] is stopped (Step S4). The leveling device 53 rises to the upper position A3 (step S5), and the seedling planting device 5 rises and stops at the upper limit position (steps S6, S7, S8).

  Thereafter, as shown in FIG. 10, the front wheel 1 is steered by the steering handle 88, and the turning at the heel side is started (pre-turning half stroke K2). Thus, even when the raising / lowering lever 76 is operated to the lower position D2 in a state where the seedling planting device 5 is stopped at the upper limit position, the leveling device 53 is held at the upper position A3.

[8]
Next, raising / lowering driving by the hydraulic cylinder 4 of the seedling planting device 5 and raising / lowering driving (lowering) by the electric motor 56 of the leveling device 53 will be described with reference to FIGS. 8 and 9.
As shown in the previous item [7] and FIG. 10, in the state where the turning at the heel has been finished about half (position KK2), when the operation lever 73 is operated to the lower position D1 (operated to the lower position D1 and the neutral position N). (Step S1), the planting and fertilization clutches 87, 90 are held in the disconnected state (the seedling planting device 5, the feeding unit 13, and the leveling device 53 are stopped), and the leveling device 53 is in the upper position A3. The seedling planting device 5 descends (steps S11, S12) and the center float 9 contacts the field G (step S13), and the seedling planting device 5 stops descending (step S14). ), The planting control means and the rolling control means described in [2] and [3] above are activated (step S15).

  In this case, as shown in FIG. 10, since the center float 9 and the side float 11 are in contact with the surface G, the center float 9 and the side float are made by continuing the turning at the shore in this state (the turning second half stroke K3). The surface 11 can be leveled by the float 11. Since the planting and fertilization clutches 87, 90 are in the disconnected state in the above-described state (turning second half stroke K3) (the seedling planting device 5, the feeding unit 13, and the leveling device 53 are stopped), the lifting lever 76 is moved in this state. Even when operated to the lower position D2 (steps S41 and S42), the leveling control means described in [6] above is held in the stopped state, and the leveling device 53 is held in the stopped state and held at the upper position A3. (Steps S52, 53).

  As shown in FIG. 10, in the state where the turning at the heel has been finished and the vicinity of the starting point (position KK3) of the next planting process K4 has been reached (the state of steps S11 to S15), the operation lever 73 is moved. When it is operated once again to the lower position D1 (operating to the lower position D1 and returning to the neutral position N) (steps S1, S11), the planting and fertilization clutches 87, 90 are operated to the transmission state (seedling planting device) 5 and the operation state of the feeding unit 13 and the leveling device 53) (steps S21 and S22). In this case, when the elevating lever 76 is operated to the lower position D2 (step S23), after the set time T1 has elapsed after the planting and fertilizing clutches 87 and 90 are operated to the transmission state (steps S24 and S25), The leveling device 53 is lowered to the lower position A4, and the leveling control means described in the previous item [6] is activated (steps S26 and S27). Thereby, it enters into the following planting process K4.

[9]
When the operation lever 73 is operated once again to the lower position D1 in the state of the previous item [8] and steps S11 to S15 of FIG. 9 (operated to the lower position D1 and returned to the neutral position N) (steps S1, S11), The planting and fertilization clutches 87 and 90 are operated to the transmission state (the seedling planting device 5 and the feeding unit 13 and the leveling device 53 are stopped) (steps S21 and S22), and then the operation lever 73 is once again moved to the lower position D1. When operated (operating to the lower position D1 and returning to the neutral position N) (steps S1 and S11), the planting and fertilizing clutches 87 and 90 are operated to be disconnected (the seedling planting device 5 and the feeding unit 13). (Stopping state of leveling device 53) (steps S21 and S31). Thus, in the state of steps S11 to S15, by repeatedly operating the operating lever 73 to the lower position D1 (by repeatedly operating the lower position D1 and returning to the neutral position N), planting Further, the transmission and cut-off state of the fertilizer application clutches 87 and 90 (the seedling planting device 5 and the feeding unit 13 and the leveling device 53 are activated and stopped) can appear alternately.

  In the state of steps S11 to S15 in the previous item [8] and FIG. 9, when the lifting lever 76 is operated to the upper position U2 (step S23), the planting and fertilization clutches 87 and 90 are transmitted as described above. Even if it is operated to the state (operation state of the seedling planting device 5 and the feeding unit 13 and the leveling device 53) (step S22), it is operated to the cutoff state (the seedling planting device 5 and the feeding unit 13 and the leveling device 53). (Step S31), the leveling control means described in the preceding item [6] is held in a stopped state, and the leveling device 53 is held at the upper position A3 (steps S32, 33).

  In the state of [8] in the previous item and steps S11 to S15 in FIG. 9, when the elevating lever 76 is operated to the lower position D2, when the planting and fertilization clutches 87 and 90 are operated to the transmission state (seedling planting) The operating state of the attaching device 5, the feeding unit 13, and the leveling device 53) (step S22), and after the set time T1 has elapsed since the planting and fertilizing clutches 87, 90 are operated to the transmission state (steps S23, S24, S25). Then, the leveling device 53 is lowered to the lower position A4, and the leveling control means described in the preceding item [6] is activated (steps S26 and S27). When the planting and fertilization clutches 87 and 90 are operated in the disconnected state (the seedling planting device 5 and the feeding unit 13 and the leveling device 53 are stopped) (step S31), the leveling device 53 rises to the upper position A3, The leveling control means described in the preceding item [6] stops (steps S32 and S33) (corresponding to the restraining means).

  As described above, in the state of [8] and steps S11 to S15 in FIG. 9, when the lifting lever 76 is operated to the lower position D2, the planting and fertilization clutches 87 and 90 are transmitted and disconnected by the operation lever 73. When the leveling device 53 is operated, the leveling device 53 is operated to be lowered to the lower position A4, the leveling control means described in [6] above is operated, and the leveling device 53 is operated to the stopped state. Then, the state is raised to the upper position A3, and the leveling control means described in the preceding item [6] is stopped.

  In this case, when the raising and lowering lever 76 is operated to the upper position U2 in a state where the planting and fertilization clutches 87 and 90 are operated in the transmission state (operation state of the seedling planting device 5, the feeding unit 13, and the leveling device 53). (Steps S1, S41), the leveling device 53 rises to the upper position A3, and the leveling control means described in [6] above is stopped (Steps S51, S52, S53). When the planting and fertilizing clutches 87 and 90 are operated in the transmission state (the operation state of the seedling planting device 5, the feeding unit 13, and the leveling device 53), the lift lever 76 is operated to the lower position D2 (step S1). , S41), the leveling device 53 is lowered to the lower position A4, and the leveling control means described in [6] above is activated (steps S42, S43, S44, S45).

[10]
As shown in FIG. 1, an elevating operation lever 92 is provided on the right side of the driver seat 31, and the elevating operation lever 92 is configured to be freely operated in an ascending position, a neutral position, a descending position, and a planting position. . When the elevating operation lever 92 is operated to the raised position, the planting and fertilization clutches 87 and 90 are operated in the disconnected state, and the planting control means and the rolling control means described in [2] and [3] are stopped. The seedling planting device 5 is raised. When the elevating operation lever 92 is operated to the neutral position, the planting and fertilization clutches 87 and 90 are operated in the disconnected state, and the planting control means and the rolling control control described in [2] and [3] are stopped. The raising / lowering of the seedling planting device 5 stops.

  When the raising / lowering operation lever 92 is operated to the lowered position, the planting and clutches 87 and 90 are operated in the disconnected state, the seedling planting device 5 is lowered, and when the center float 9 contacts the surface G, the previous item [2] [ 3] The planting control means and the rolling control means described in 3] operate. When the elevating operation lever 92 is operated to the planting position, the planting and fertilizing clutches 87 and 90 are operated to the transmission state in addition to the state where the elevating operation lever 92 is operated to the lowered position.

  When the elevating lever 92 is operated to the raised position, neutral position, and lowered position (corresponding to the non-working state), the planting and fertilizing clutches 87 and 90 are cut off as in the previous section [7] and steps S4 and S5 in FIG. It is operated to the state (the seedling planting device 5 and the feeding unit 13 and the leveling device 53 are stopped), and the leveling device 53 rises to the upper position A3. In this case, even when the elevating lever 76 is operated to the lower position D2 while the elevating operation lever 92 is operated to the raised position, the neutral position, and the lowered position, the leveling device 53 is held in the stopped state and held at the upper position A3. Is done.

  When the lifting / lowering lever 76 is operated to the lower position D2 and the lifting / lowering operating lever 92 is operated to the planting position (corresponding to the working state), the planting is performed in the same manner as in the previous item [8] and steps S23 to S27 in FIG. And after the set time T1 has elapsed since the fertilizing clutches 87 and 90 were operated in the transmission state (the operation state of the seedling planting device 5 and the feeding unit 13 and the leveling device 53), the leveling device 53 descends to the lower position A4, The leveling control means described in the preceding item [6] operates.

  In this case, in the state in which the elevating operation lever 92 is operated to the planting position (operation state of the seedling planting device 5, the feeding unit 13, and the leveling device 53), the steps [41] and steps S41, S44, S45 in FIG. Similarly to S52 and S53, when the elevating lever 76 is operated to the upper position U2, the leveling device 53 rises to the upper position A3, and the leveling control means described in [6] above is stopped. When operated to the position D2, the leveling device 53 is lowered to the lower position A4, and the leveling control means described in the preceding item [6] is activated.

[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], instead of the configuration in which the working and non-working states are determined based on the transmission and shut-off state of the planting clutch 87, the following configuration may be used.
A hydrostatic continuously variable transmission (not shown) and a gear transmission type auxiliary transmission (not shown) are provided for traveling, and an auxiliary transmission lever (not shown) for operating the auxiliary transmission to a low speed and a high speed position. Not shown). As shown in FIG. 1, a main transmission lever 72 for operating a hydrostatic continuously variable transmission is provided, and the accelerator of the engine 49 and the transmission lever 72 are mechanically linked, and the transmission lever 72 is connected to the high speed side. When operated, the accelerator of the engine 49 is also operated to the high speed side. Since the rotational speed of the engine 49 and the traveling speed of the airframe have a predetermined relationship, a rotational speed sensor (not shown) for detecting the rotational speed of the engine 49 is provided, and the detected value of the rotational speed sensor is stored in the control device 40. The traveling speed of the aircraft is calculated by the control device 40 based on the detected value of the rotation speed sensor and the operation position (low speed and high speed position) of the auxiliary speed change lever.

As a result, when the sub-shift lever is operated to the high speed position, it is determined that the sub-shift lever is moving on the road, and it is determined that it is in a non-working state regardless of the detection value (travel speed of the aircraft) of the rotation speed sensor. The
When the sub-shift lever is operated to the low speed position, the main speed change lever 72 is operated to the low speed side, and the detected value (running speed of the aircraft) becomes lower than the set speed (or planted). When the attached clutch 87 is operated in the disengaged state), it is determined that the vehicle is turning on the coast (see the first half of the turn and the second half of the turn K2 and K3 in FIG. 10) or when entering or leaving the paddy field while overcoming the saddle. Thus, it is determined that it is in a non-working state.
When the main transmission lever 72 is operated to the high speed side while the auxiliary transmission lever is operated to the low speed position, and the detected value (running speed of the aircraft) is higher than the set speed, It is determined that the vehicle is in the traveling state (see planting processes K1 and K4 in FIG. 10), and is determined to be in the working state.

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], instead of the configuration in which the working and non-working states are determined based on the transmission and shut-off state of the planting clutch 87, the following configuration may be used.
When a steering angle sensor (not shown) for detecting the steering angle of the front wheel 1 is provided and the steering angle of the front wheel 1 is located within the range of the right and left set angles from the rectilinear position, planting It is determined that the vehicle is in the traveling state (see planting processes K1 and K4 in FIG. 10), and is determined to be in the working state. When the steering angle of the front wheel 1 exceeds the right and left set angles and is located on the right and left sides, it is during turning at the shore (see the first half of the turn and the second half of the turn K2 and K3 in FIG. 10). As a result, it is determined that the state is a non-working state.

[Third Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], instead of the configuration in which the working and non-working states are determined based on the transmission and shut-off state of the planting clutch 87, the following configuration may be used.
As shown in FIGS. 1 and 4, the power of the engine 49 is transmitted through the planting clutch 87 and the PTO shaft 22 through the input shaft 28, the transmission chain 30, the transmission shaft 23, and the input shaft 32, and the drive shaft 61 and The power transmitted from the engine 49 to the front wheels 1 and the rear wheels 2 is branched, not to be transmitted to the rotating body 62 (leveling device 53), and this power is split into the drive shaft 61 and the rotating body 62 (leveling). Configured to be transmitted to the device 53). If comprised in this way, regardless of the transmission and interruption | blocking state of the planting clutch 87, if an airframe drive | works (when motive power is transmitted to the front wheel 1 and the rear-wheel 2), the drive shaft 61 and the rotary body 62 (leveling device 53). ) Is transmitted.

When a steering angle sensor (not shown) for detecting the steering angle of the front wheel 1 is provided and the steering angle of the front wheel 1 is located within the range of the right and left set angles from the rectilinear position, planting It is determined that the vehicle is in a traveling state (see planting processes K1 and K4 in FIG. 10) and is determined to be in a non-working state. Thereby, the field surface G is not leveled unnecessarily by the leveling device 53 in the planting traveling state.
When the steering angle of the front wheel 1 exceeds the right and left set angles and is located on the right and left sides, it is during turning at the shore (see the first half of the turn and the second half of the turn K2 and K3 in FIG. 10). It is judged and it is judged that it is a working state. In this case, the planting clutch 87 is operated in the disconnected state, but the center float 9 and the side float 11 are kept in contact with the rice field G without raising the seedling planting device 5. Thereby, the field G which is roughened by the front wheel 1 and the rear wheel 2 when turning at the shore is leveled by the leveling device 53.

[Fourth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] to [Third Alternative Embodiment of the Invention], the following configuration may be adopted.
As shown in FIG. 11, in addition to the upper position U2 and the lower position D2 with respect to the lifting lever 76, a forcible lower position D3 is provided on the lower side of the lower position D2, and the lifting lever 76 is forced into the upper position U2 and the lower position D2. It is configured to be operable at the lower position D3.

As shown in FIG. 11, when the elevating lever 76 is operated to the upper position U2 and the lower position D2, the states described in the previous items [7], [8], and [9] are obtained. When the elevating lever 76 is operated to the forced lower position D3, the leveling device 53 is configured to be positioned at the lower position A4 regardless of the transmission and cut-off state of the planting and fertilizing clutches 87 and 90 (corresponding to the forced lowering means). .
In this case, instead of providing the forcible lower position D3 with respect to the lifting lever 76, a forcibly lowering lever (or a forced lowering switch) (not shown) that can be operated manually is provided separately from the lifting lever 76. By operation of the forced lowering lever (or forced lowering switch), the leveling device 53 may be positioned at the lower position A4 regardless of the transmission and disconnection state of the planting and fertilizing clutches 87, 90 (forced lowering). Equivalent to means).

[Fifth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] to [Fourth Alternative Embodiment of the Invention], the leveling device 53 is not supported by the seedling planting device 5. Alternatively, the leveling device 53 may be supported on the rear portion of the machine body so as to be movable up and down, or the leveling device 53 may be supported on the link mechanism 3 so as to be driven up and down. In this case, if the leveling device 53 is supported so as to be movable up and down at the rear part of the machine body, even if the seedling planting device 5 is raised and stopped at the upper limit position, the compulsory described in [Fourth Embodiment of the Invention] By the descending means, the leveling device 53 can be positioned at the lower position A4 and can be brought into contact with the field G.
As paddy field work device and ground work device, fertilizer application device, direct sowing device, chemical spraying device and rice bran spraying device, grooving machine (groove for non-tillage rice planting), grooving machine (groove for drainage), sheet laying device ( A sheet rolled for rolls (for weed prevention) may be provided while being spread on the surface).

Overall side view of riding rice transplanter Side view of seedling planting device and leveling device Front view of seedling planting device and leveling device Top view of seedling planting device and leveling device Side view of the front of the leveling device and center float Whole perspective view of rotating body of leveling device The figure which shows the cooperation state of a control apparatus and each part The figure which shows the flow of the first half of the control based on an operation lever and a raising / lowering lever The figure which shows the flow of the latter half of the control based on an operation lever and a raising / lowering lever A plan view showing a state where the riding rice transplanter has completed a planting process, reaches the shore, makes a turn at the shore, and enters the next planting process Rear view of the vicinity of the operation lever and the lifting lever in the fourth alternative embodiment of the invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front wheel 4 Lifting mechanism 5 Paddy field work device 53 Ground work device 56 Actuator 76 Artificial operation tool 85 Discriminating means 87 Work clutch A3 Upper position A4 Lower position T1 Set time G

Claims (7)

Support the paddy field working device at the rear of the machine body so that it can be driven up and down by the lifting mechanism, and support the ground working device so that it can be driven up and down by the actuator,
Equipped with an artificial operation tool that can be manipulated artificially,
An ascending state in which the actuator is operated so that the ground work device is located at an upper position above the surface, and a lowered state in which the actuator is actuated so that the ground work device is located in a lower position where the ground work device can be grounded to the surface. It is configured to be settable by a human operation tool, and has a determination means for determining a working state and a non-working state,
When the lowered state is set by the human operation tool, the actuator is operated so that the ground work device is positioned at the upper position when it is in the non-working state, and the ground work device is moved to the lower position when it is in the work state. The paddy field work machine provided with the check means which operates an actuator so that it may be located.   The discriminating means is configured to discriminate a working state when a working clutch capable of transmitting and interrupting power to the paddy field working device is in a transmitting state, and to determine a non-working state when the working clutch is in a disengaged state. The paddy field work machine according to claim 1 constituted.   The discriminating means is configured to discriminate that it is in the working state when the traveling speed of the aircraft is the working traveling speed, and to determine that it is in the non-working state when the traveling speed of the aircraft is the non-working traveling speed The paddy field machine according to claim 1.   If the steering angle of the freely steerable front wheel is within the range of the right and left set angles from the straight-ahead position, it is determined that it is in the working state, and the steering angle of the front wheels sets the right and left set angles. The paddy field machine according to claim 1, wherein the discriminating means is configured to discriminate that it is in a non-working state when it is positioned on the right and left sides beyond.   5. The check means is configured so that the actuator is operated and the ground work device is positioned at a lower position after a set time has elapsed from the time when the non-working state is switched to the working state. The paddy field machine as described in any one of them.   In the state where the lowered state is set by the human operation tool, the lift state is set by the human operation tool when the actuator is operated so that the ground work device is positioned at the lower position due to the working state. Then, the paddy field work machine according to any one of claims 1 to 5, wherein the actuator is operated in preference to the check means and the ground work device is positioned at an upper position.   The paddy field work machine according to any one of claims 1 to 6, further comprising forced lowering means for operating the actuator so that the ground work device is positioned at a lower position in preference to the check means.

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