JPH08214638A - Power transmission for transplanting machine - Google Patents

Abstract

PURPOSE: To enable the planting cups to exactly stop at the prescribed stopping positions. CONSTITUTION: In the power transmission for a transplanting machine which is equipped with vertically movable planting cup 20, which is interlocked to the driving unit, further equipped with the electromagnetic clutch 103 for disconnect the interlocking between the driving unit and the planting cup 20 where the driving unit allows the planting cup 20 to repeat the vertical motion while a seedling is planted, when the cup 20 goes down, in the meantime, when the cup 20 comes up to the prescribed stopping position, the electromagnetic clutch 103 is tentatively discontinued to stop the planting cup 20 where the cup 20 receives the new seedling to be planted and secures a prescribed distance between hills, a brake is set for braking the vertical motion of the planting cup, so that it comes near the prescribed stopping position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device for an implanter.

[0002]

2. Description of the Related Art In a transplanter, a planting cup is linked to a drive unit such as an engine through a swinging link mechanism, and the drive unit causes the planting cup to repeatedly move up and down. Received pot seedlings for planting at top dead center,
There is a device that pierces pots at bottom dead center to transplant pot seedlings, but in the conventional power transmission device of this kind of transplanter, an electromagnetic clutch is provided to connect and disconnect the drive device and the planting means. , When the planting cup reaches a predetermined stop position (top dead center), the electromagnetic clutch is temporarily disconnected (switched from ON to OFF) to stop the planting cup, and while receiving the pot seedling, By stopping the raising and lowering of the planting cup, a predetermined plant spacing, which is the planting interval, was obtained (for example, Japanese Patent Application No. 4-270519).

[0003]

However, in the conventional case,
Even if the electromagnetic clutch is disengaged, the planting cup cannot be stopped immediately due to inertial force, and the stop position varies depending on the lifting speed of the planting cup, which may prevent smooth receiving of seedlings. There was a problem.

In view of the above problems, the present invention is to enable the planting cup to be accurately stopped at a predetermined stop position.

[0005]

The first technical means of the present invention for solving this technical problem is to provide a planting cup 20 which moves up and down, and the planting cup 20 is interlocked with a drive device. An electromagnetic clutch 103 is provided that connects and disconnects the interlocking between the drive device and the planting cup 20. The drive device causes the planting cup 20 to repeat the vertical movement, and when the planting cup 20 comes to the descending side, the seedling 12 is removed. At the same time as planting, the electromagnetic clutch 103 is temporarily disengaged when the planting cup 20 reaches a predetermined stop position on the rising side.
In the power transmission device of the transplanter in which 0 is stopped and the seedlings 12 for planting are received and a predetermined distance between plants is obtained, when the planting cup 20 comes close to the predetermined stop position, the planting cup The point is that a braking device 124 for braking the lifting operation of the 20 is provided.

The second technical means of the present invention is that the planting cup 2 is provided between the planting cup 20 and the electromagnetic clutch 103.
The one-way clutch 140 is provided so that 0 does not move backward.

[0007]

When the planting cup 20 comes close to the predetermined stop position, the braking device brakes the planting cup 20 and disconnects the electromagnetic clutch, so that the raising / lowering operation of the planting cup 20 is immediately stopped and the planting cup 20 is stopped. Stops exactly at the predetermined stop position. In addition, the one-way clutch provided between the planting cup 20 and the electromagnetic clutch prevents the planting cup 20 from moving backward due to the braking force of the braking device when the planting cup 20 is stopped.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows a passenger transplanter 1. This transplanter 1
Is equipped with a transplanting device 3 behind the riding type traveling vehicle 2 and automatically plantes soil block seedlings in a ridge at a predetermined interval while traveling in the longitudinal direction across the ridge.

The traveling vehicle 2 is provided with an engine, a fuel tank, etc. covered with a bonnet 5 and a steering section 6 provided with a steering wheel on the front portion of a vehicle body frame 4, and drives behind the steering section 6. A seat 7 is provided, and the body frame 4 is supported by a pair of left and right front wheels 8 and a pair of left and right rear wheels 9 so that the vehicle body frame 4 can travel. The front wheels 8 are steerable wheels, and the power from the engine can be transmitted to the front wheels 8 and the rear wheels 9, and the seedling trays 13 to be described later can be placed on the left and right sides of the bonnet 5. A stand 10 is provided.

As shown in FIGS. 6 and 7, the transplanting device 3 is a seedling tray feeding device for intermittently feeding seedling trays 13 containing a large number of soil block seedlings vertically and horizontally on the upper front side of the main frame 11. 14 is provided, and a seedling dispensing device 16 is provided behind the seedling tray feeder 14 to take out soil block seedlings one by one from the seedling tray 13 and convey the seeds to a planting device 15 provided below the main frame 11. It is provided with a soil-covering / squeezing roller 17 below the rear portion of the main frame 11 for the main configuration.

The transplanting device 3 according to the present embodiment is for two-row planting, and correspondingly has a pair of left and right planting devices 15, seedling feeding devices 16, covering and crushing rollers 17, and the like.
The seedling tray 13 is made of plastic, is thin and flexible, and is provided with a large number of pot portions 13a arranged in a grid pattern at a predetermined pitch in the vertical and horizontal directions. The opening edges of the pot portions 13a are mutually connected. Are connected in a plane. Then, soil pot seedlings are grown by filling the pot portion 13a with bed soil, and sowing and raising seedlings there.

The main frame 11 is supported at the rear portion of the vehicle body frame 4 of the traveling vehicle 2 so as to be vertically movable via a three-point link mechanism 18 including a top link 18a and a pair of left and right lower links 18b. Top link 1
A hydraulic cylinder (not shown) is provided between the transfer device 8a and 8a, so that the transplantation device 3 can be moved up and down.

The soil covering / squeezing roller 17 is elastically and vertically adjustable by a suspending device 19 so as to be pressed against the ridge with an appropriate pressure, and is supported so as to be vertically movable. The planting device 15 is a planting cup 20.
And a swing link mechanism 21 that supports the planting cup 20 so as to swing up and down. The swing link mechanism 21 includes a swing frame 22 mounted on the main frame 11 side so as to swing about a left and right axis, and a first parallel link 23 having an upper end side pivotally supported so as to swing back and forth. A swing plate 24 is pivotally attached to the lower end side of the parallel link 23, a second parallel link 25 is pivotally supported on the swing plate 24 so as to be vertically swingable, and a crankshaft 26 is attached to an upper link of the second parallel link 25.
A support arm 27 that is rotatable around is pivotally mounted.

Therefore, when the support arm 27 rotates around the crankshaft 26, the first and second parallel links 2
The planting cup 20 swings up and down by 1 and 23, and also swings back and forth. When the planting cup 20 is moved up and down while traveling, the planting cup 20 is against the field. , There is almost no forward movement. The planting cup 20 is provided with an opener that can be opened and closed at the bottom, and the opener opens forward and backward by the interlocking tool 28 when the projecting cup 20 rushes into the ridge at the lower end side of the trajectory D of the planting cup 20 to open the planting hole. While being formed, soil block seedlings supplied on the upper end side of the locus can be planted in the planting holes.

The seedling dispensing device 16 reciprocates the seedling take-out pawl 29 with respect to the seedling tray 13 loaded in the seedling feeding device 14 so that the opening of the pot portion 13a faces rearward and upward, and the main frame It is attached to a support frame 30 fixed on 11 via a reciprocating mechanism 31. With this reciprocating mechanism 31, the seedling take-out claw 29 is moved in one swinging motion of the planting cup 20 as follows. It makes one reciprocating movement.

That is, the seedling take-out claw 29 is the pot portion 13a.
The lower side of the block soil in the inside is pierced obliquely from the rear direction, and the soil block seedlings are pulled back from the pot portion 13a while moving backward so as to scoop up the soil block seedlings, and then the soil block seedlings are placed in a substantially vertical posture. It moves downward while changing the posture so that the soil block seedlings are discharged at the lower end position of the movement locus thereof, and are dropped and supplied to the planting cup 20 located at the upper end of the movement locus of the planting cup. After that, it returns to the original position and the same operation as described above is repeated.

As shown in FIGS. 4 to 8, the seedling tray feeding device 14 is arranged at the rear of the driver's seat 7, and is placed on the support frame 33 fixed to the main frame 11 via guide rails 34 and the like to the left and right. The movable frame 36 includes a pair of left and right movable frames 36 that are movably supported in a direction and are connected to each other by a connecting member 35. The movable frame 36 tilts forward so that the seedling tray 13 can be supplied from the driver's seat 7 side. Is fixed in a circular shape, and its rear surface is inclined obliquely upward toward the front.

Each movable frame 36 has a support plate 37 for supporting the bottom portion of the seedling tray 13 (that is, the bottom portion of the pot portion 13a) across the pot portions 13a arranged in a row, and the support plate 37 has left and right side plates 38. A regulation plate 39, which is mounted and fixed between the support plates 37, is provided at the center of the support plate 37 in the left-right direction and located in the gap between the pot portions 13a to regulate the lateral movement of the seedling tray 13.

The support plate 37 is extended to the pot portion 13a at the position where the soil block seedlings are taken out by the seedling take-out claws 29 of the seedling feeding device 16.
The lower end side of 7 prevents the seedling tray 13 from bending when the seedling take-out nails 29 are pierced into the block soil, so that the seedling take-out nails 29 can stably take out the soil block seedlings.

A vertical feed drive shaft 40 is provided below the left and right movable frames 36, extending over the left and right movable frames 36, and a vertical feed driven shaft 41 is provided on the left and right movable frames 36. The drive shaft 40 and the driven shaft 41 are rotatably supported by the side plate 38 via bearings. A pair of left and right drive sprockets 42 is fixed to the drive shaft 40 with respect to each movable frame 36.
A pair of left and right driven sprockets 43 is fixed to each movable frame 36 at 1, and these drive sprockets 42 and driven sprockets 43 are arranged inside the side plate 38.

An endless chain 44 is hung between the drive sprocket 42 and the driven sprocket 43, and a transport pin 45 which engages with the gap between the pot portions 13a in the vertical direction is mounted on the chain 44. Installed. Therefore, the seedling tray 13 can be vertically fed by rotating the drive shaft 40 in the direction indicated by the arrow A in FIG.

The carrying pin 45 is provided in the pot portion 13
Pot parts 13a of several seedling trays 13 with different intervals of a
It is provided at a position matching the pitch between them or the mounting position can be changed. A handle 46 that can be operated from the driver's seat 7 side is attached and fixed to the end of the driven shaft 41, and the first seedling tray 13 is moved to the front row of the seedling tray 13 by rotating the handle 46. (1st row at the bottom)
Can be located at the seedling take-out position.

The support plate 37 is inclined forward and
The upper side 37a is bent at a predetermined angle Θ in the middle of the vertical direction, the upper side 37a has a relatively gentle slope so that the seedling tray 13 can be easily placed from the driver's seat 7, and the lower side 37b has the seedling removing claws 2.
The slope is relatively steep considering that the seedlings can be taken out by 9, the longitudinal feeding of the seedling tray 13 can be facilitated, and the front-rear length of the transplanter 1 can be made compact.

When the seedling tray 13 is supplied, it is carried out by placing the seedling tray 13 on the upper side 37a of the support plate 37, and the first seedling tray 13 is vertically operated to a predetermined position by a manual operation with the handle 46. Sent to the next seedling tray 1
From 3, the seedling tray 13 placed on the upper side 37a of the support plate 37 is automatically fed by the intermittent vertical feeding operation of the drive shaft 40.

The timing for replenishing the seedling tray 13 is detected by a pair of upper and lower seedling replenishment detection sensors 47 and 48 provided on the upper side 37a of the support plate 37, and an alarm buzzer is sounded by this detection signal. The upper and lower sensors 47, 48 are arranged with the restriction plate 39 sandwiched therebetween, and the lower sensor 48 is arranged in the vicinity of the bent portion of the support plate 37. In addition, the upper and lower sensors 47,
48 is pivotally attached to the lower surface of the support plate 37 so as to be vertically swingable,
The support plate 37 is configured to be freely retractable and retractable through an opening formed in the support plate 37, and is further urged to project upward from the opening.

The upper and lower sensors 47 and 48 are AND circuits in their electric circuits, and one of the sensors 47 and 48 is the pot portion 13a of the seedling tray 13.
The alarm buzzer is turned off when pressed by, and the alarm buzzer is turned on and sounds in a state where the pot portion 13a is not present on both sensors 47 and 48.

That is, when the pot portion 13a is disengaged from the sensor 47 on the upper side, and the pot portion 13a in the last row is disengaged from the sensor 48 on the lower side and moved to the lower side of the support plate 37, an alarm buzzer sounds. It is designed to let you know when to replenish. In this way, when the pot portion 13a in the last row moves to the lower side of the support plate 37, the seedling tray 13 is replenished only after the trailing edge portion of the preceding seedling tray 13 is moved backward. This is because the front edge portion of the seedling tray 13 that is used can be easily slipped into it. And the subsequent seedling tray 13
When the front edge of the seedling tray 13 does not go under the trailing edge of the preceding seedling tray 13, that is, in the opposite state, when the front row of the succeeding seedling tray 13 comes to the seedling take-out position, In a floating state, the seedling take-out nails 29 do not enter the pot portion 13a at the correct angle, which may result in poor take-out of the soil block seedlings.

If only the lower sensor 48 is provided with the pair of sensors 47 and 48, the load on the seedling tray 13 is not uniform, the radius of curvature of the seedling tray 13 and the bent portion of the support plate 37 are small. Due to the disagreement with the bending angle Θ, the pressing of the sensor 48 by the pot portion 13a becomes unstable and the contact point switching becomes unstable, mainly in the longitudinal midway portion of the seedling tray 13, so as to provide certainty, The sensor 47 is provided at a position apart from the bent portion of the support plate 37.

If only the upper sensor 47 is provided, an alarm buzzer will be activated before the replenishment time. Further, the left and right widths of the sensors 47 and 48 are formed with a certain degree of width so as to correspond to the seedling trays 13 (for example, 200 holes and 128 holes) having different pitches in the pot portion. Inside the left and right side plates 38 of each movable frame 36, a pair of upper and lower chain guides 49 and 50 for mounting and guiding the chains 44 are fixed, and the lower side of the upper chain guide 49 is slightly below the bent portion of the support plate 37. As far as it goes, it is bent like the support plate 37. The lower chain guide 50 is provided below the side plate 38.

Further, each movable frame 36 has first to fourth tray guides 51, 52, 53, 54 for guiding the seedling tray 13.
Is provided. The first tray guide 51 is fixed to the middle portion of the left and right side plates 38 in the vertical direction and engages with and guides the upper surfaces of the left and right side edges of the seedling tray 13, and the upper portion of the tray guide 51 is the support plate 37. The trailing edge of the preceding seedling tray 13 reaches the trailing seedling tray 1 until reaching slightly above the bent portion.
It is pushed up at the front edge of 3 and is prevented from coming off the chain 44.

The second tray guide 52 is fixed to the lower portions of the left and right side plates 38 and engages with the upper surfaces of the left and right side edges of the seedling tray 13 to guide it. Third tray guide 53
Is fixed to the lower parts of the left and right side plates 38 along the drive sprocket 42, and along the drive sprocket 42, the seedling tray 13
Is what bends.

The fourth tray guide 54 is formed by bending the bar material in a U-shape when viewed obliquely from the rear side, and the front upper part is arranged to guide the seedling tray 13 after the block seedling 12 is taken out to the rear of the driver's seat 7. And is fixed to a horizontal bar 55 fixed to the movable frame 36. Here, the lateral feeding mechanism of the seedling tray 13 will be described. As shown in FIG. 7, a lateral feeding shaft 57 having an endless spiral groove is attached to the support frame 33 so as to be rotatable around the lateral axis. A slider 58 having an engaging member that engages with the spiral groove is externally fitted to the shaft 57.
8 is connected to the movable frame 36 on the left side, and the lateral feed shaft 57
When the drive is intermittently rotated, the slider 58 moves left and right, and the left and right movable frames 36 are intermittently reciprocated in the left and right direction.

Next, the intermittent vertical feeding mechanism of the seedling tray 13 will be described. As shown in FIGS. 10, 11 and 7,
Vertical feed cams 59 are provided at both left and right ends of the horizontal feed shaft 57, and a vertical feed shaft 60 is rotatably supported between the left and right side plates 38 on the movable frame 36 on the left side. A pair of left and right followers 61 that engage with the vertical feed cam 59 when the movable frame 36 moves to the leftmost end or the rightmost end is provided.

An arm 62 is fixed to the vertical feed shaft 60, a cylinder rod 63a of a gas spring 63 is pivotally attached to the arm 62, and the arm 62 is constantly urged in the direction of arrow B in FIG. The cylinder of the gas spring 63 is pivotally attached to the lower surface of the support plate 37. further,
A first link 64 is fixed to the vertical feed shaft 60, and a second link 65 is pivotally attached to the first link 64.
5, a lock release arm 66 having an engagement pin 66a on the tip side is pivotally attached, and the lock release arm 66 is rotatably fitted onto the vertical feed drive shaft 40 via a connecting member 67. It is connected to 68.

In this one-way clutch 68, the first vertical feed gear 69 has a vertical feed direction (see FIG. 1).
0 and indicated by arrow A in FIG. 8) are interlockingly connected so as to rotate together. A second vertical feed gear 70 in which an engaging tooth 70 having a pitch different from the engaging tooth 69a of the first vertical feed gear 69 is formed in the first vertical feed gear 69.
The second vertical feed gear 70 is formed with a hole 73 through which the connecting pin 72 fixed to the clutch shifter 71 is inserted.

The clutch shifter 71 is a vertical feed drive shaft 4
0 is spline-fitted so as to be movable in the axial direction, and the clutch shifter 71 is provided with a lever shaft 74 rotatable by a lever operation and a shift fork 75 fixed to the lever shaft 74, and a vertical feed drive shaft 40. It can be moved in the axial direction of the. First and second vertical feed gears 69,
First and second ratchet arms 76 and 77 that engage with the engagement teeth 69a and 70a, respectively, are arranged on the upper side of 70, and these first and second ratchet arms 76 and 7 are provided.
7 is a side plate 3 of the movable frame 36 that is swingable up and down about a support shaft 78.
8 and each of them is biased by a tension coil spring 80 so as to swing downward,
6a and 77a are engaged with the engaging teeth 69a and 70a of the first and second vertical feed gears 69 and 70.

Further, each ratchet arm 76, 77 is formed with an arcuate engagement surface 76b, 77b with which the engagement pin 79 of the lock release arm 66 is engaged, and each ratchet arm 76, 77 is further provided with: The engagement rods 81 and 82 are fixed. A selection member 83 is provided below the engagement rods 81 and 82, and the selection member 83 is formed by cutting the cylindrical body as shown in FIG.
It is formed so as to be engaged with one of the two 82 and is rotated by the operation of the lever body 84. By pushing up one of the first and second ratchet arms 76, 77, The first and second ratchet arms 76 and 77 can be selectively engaged with the first and second vertical feed gears 69 and 70.

The operation of the intermittent vertical feed mechanism of the seedling tray 13 described above will now be described. As shown in FIG.
One of the two ratchet arms 76, 77 is the first
-The vertical feed gears 69 and 70 of 2 are selectively engaged.
In the illustrated example, the engaging portion 76 a of the first ratchet arm 76
Engages with the engaging teeth 69a of the first vertical feed gear 69, and the second
The ratchet arm 77 engaging portion 77a is disengaged from the engaging tooth 70a of the second vertical feed gear 70. Further, the vertical feed cam 59 is intermittently rotated together with the horizontal feed shaft 57 in the arrow C direction.

When the movable frame 36 moves to the left and right ends, the follower 61 is pushed by the vertical feed cam 59 in the direction of the arrow D to compress the gas spring 63 via the arm 62, and then the gas spring 63. Return by the urging force of. As the follower 61 moves in the arrow D direction, the vertical feed shaft 60 rotates and the second link 65 is pushed in the arrow E direction via the first link 64. by this,
The lock release arm 66 rotates together with the one-way clutch 68 around the axial center of the vertical feed drive shaft 40 in the direction opposite to the arrow A direction to move the engagement pin 66a in the arrow F direction. Engaging surface 76b of the first ratchet arm 76
Is pressed to push up the first ratchet arm 76, and the engaging portion 76a is disengaged from the engaging tooth 69a of the first vertical feed gear 69. At this time, the one-way clutch 68 idles and the first first vertical feed gear 69 does not rotate.

Next, when the follower 61 returns, the first link 64, the second link 65, and the lock release arm 66 return to their original positions. At this time, the first longitudinal feed gear is passed through the one-way clutch 68. 69 is rotated in the direction of arrow A, and the vertical feed drive shaft 40 is rotated in the direction of arrow A via the second ratchet arm 77 and the clutch shifter 71, while the first
The engaging portion 76a of the ratchet arm 76 engages with the engaging tooth 69a of the first vertical feed gear 69 to restrict the rotation of the vertical feed drive shaft 40.

As a result, the seedling tray 13 is placed in the pot section 1.
The sheet is vertically fed by an amount corresponding to the vertical spacing of 3a. That is, the engaging teeth 69a of the first and second vertical feed gears 69, 70,
The interval of 70a is formed so as to correspond to one pitch in the vertical direction of the pot portion 13a of the seedling tray 13 placed on the movable frame 36. Therefore, in this embodiment, two kinds of seedling trays 13 can be supported.

As described above, the pot portions 13 arranged in a horizontal row
At the time when the removal of the soil block seedlings from a is completed, the seedling tray 13 is fed by one pitch in the vertical direction. Next, the power transmission mechanism of the transplantation device 3 will be described. FIG. 3 shows a mechanical diagram of the power transmission system. In FIG. 3, the power of the engine, which is a drive device, is linked to the rear wheels 9 of the traveling device via the main clutch, the transmission mechanism, and the propeller shaft 10.
It is linked to 1.

The propeller shaft 101 is connected to a rotary shaft 105 via a universal joint 102, an electromagnetic clutch 103 and a bevel gear mechanism 104, and the rotary shaft 1
Reference numerals 05 are connected to a pair of rotating shafts 107 also shown in FIG. 6 via key bosses 106, respectively. A pair of rotating shafts 107
Are linked to the pair of crankshafts 26 via a chain transmission mechanism 108. Each time the crankshaft 26 rotates, each planting cup 20 moves up and down while drawing an ellipse.

One rotating shaft 107 is interlocked with a rotating shaft 113 via a chain transmission mechanism 111 and a gear mechanism 112, and the rotating shaft 113 is reciprocating mechanism via a chain transmission mechanism 114 also shown in FIG. The pair of drive shafts 115 is interlocked and connected. Each drive shaft 115 is provided with a slide mechanism 116, and each drive shaft 115 is configured to be extendable and contractible by the slide mechanism 116.

One drive shaft 115 is interlockingly connected to the lateral feed shaft 57 via a chain transmission mechanism 117 and a gear mechanism 118 for intermittent driving. The electromagnetic clutch 10
3 is on / off controlled by the control means 121. That is, the control means 121 inputs the detection signal from the upper limit detection switch 122 which detects that the planting cup 20 is at the top dead center, and the upper limit detection switch 122 causes the upper limit of the planting cup 20 to be in the connected state of the electromagnetic clutch 103. The electromagnetic clutch 103 is switched from ON to OFF when is detected. Further, the control means 121 controls the interval at which the electromagnetic clutch 103 is switched from off (disengagement) to on (connection) so that the stock distance set by the setting switch or the like can be obtained. The upper limit detection switch 122 is composed of a proximity switch or the like, and is provided above the parallel links 23, 25 or the support arm 27.

In the structure described above, the tip of the electromagnetic clutch 103 is configured to be transmitted by the chain transmission mechanism and the gear transmission mechanism, and the left and right planting devices 15,
The seedling dispensing device 16, the seedling tray feeding mechanism, and the like are synchronized so that the left and right seedling planting positions do not shift in the front-rear direction. In FIGS. 1 and 2, the braking device 124 that brakes the lifting operation of the planting cup 20 includes a brake arm 125 and a brake cam 126. The brake arm 125 is fixed to the crankshaft 26, and a braking roll 127 made of rubber or the like is attached to the tip of the brake arm 125 so as to be rotatable around the horizontal axis 128. The brake cam 126 is attached to the swing frame 22 along the horizontal axis 12.
It is attached so that it can rotate about 9 turns. The free end side of the brake cam 126 is connected to the crankshaft 2 by the coil spring 131.
6 is pulled, and the free end side of the brake cam 126 contacts the stopper 133 via the cushioning material 132, whereby the planting cup 20 moves up and down and a predetermined top dead center is reached. Each time it reaches the stop position, the braking roll 12
7 engages with the cam portion 134 of the brake cam 126, presses the brake cam 126 against the brake arm 125, and brakes the planting cup 20 at the upper fulcrum. The braking force by the braking device 124 is set to such an extent that when a current again flows into the electromagnetic clutch 103 and the electromagnetic clutch 103 is connected, the brake arm 125 pushes the brake cam 126 open and the lifting and lowering of the planting cup 20 can be started.

The stopper 133 is provided so as to project from the swing frame 22, the cushioning material 132 is made of rubber or the like, and the cushioning material 132 is fixed to the stopper 133. A bracket 135 is provided on the swing frame 22, and a mounting bolt 136 is movably mounted on the bracket 135 via a nut 137. The mounting bolt 136 is mounted between the mounting bolt 136 and the free end side of the brake cam 126. Coil spring 131
Are connected.

The crankshaft 26 is rotatably supported by the rocking frame 22 via a bearing 139, and is supported by the bearing 131.
A one-way clutch 140 is built in so that the crankshaft 26 does not rotate in the reverse direction, so that the planting cup 20 does not move backward. That is, when the electromagnetic clutch 103 is in the disengaged state, the brake arm 125 reversely rotates around the crankshaft 26 and the planting cup 20 reversely moves due to the bias of the coil spring 131.
Are prevented by.

According to the configuration of the above embodiment, the predetermined stop position of the planting cup 20 is set to the top dead center, and the planting cup 2 is
When 0 reaches the top dead center, the electromagnetic clutch 103 is disengaged and the braking device 124 simultaneously applies the braking. However, the stop position of the planting cup 20 is not limited to the top dead center, but before the top dead center. It may be, or it may be a position beyond the top dead center. Further, the disconnection of the electromagnetic clutch 103 and the time when the braking by the braking device 124 is applied may be slightly shifted.

[0050]

According to the present invention, since the planting cup 20 is braked by the braking device 124 when the planting cup 20 is near the predetermined stop position, when the electromagnetic clutch 103 is disengaged, the planting cup is closed. The elevating operation of 20 can be smoothly stopped, and therefore the planting cup 20 can be accurately stopped at a predetermined stop position. Moreover, the one-way clutch 140 provided between the planting cup 20 and the electromagnetic clutch 103 can prevent the planting cup 20 from moving backward due to the braking force of the braking device 124 when the planting cup 20 is stopped.

[Brief description of drawings]

FIG. 1 is a side view of a braking device portion showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the braking device portion.

FIG. 3 is a system diagram showing a power transmission system of the transplantation device.

FIG. 4 is an overall side view of the passenger transplanter.

FIG. 5 is an overall plan view of the passenger transplanter.

FIG. 6 is a side view of the implanting device.

FIG. 7 is a schematic development view of the seedling feeding device.

FIG. 8 is a schematic side sectional view of a movable frame.

FIG. 9 is an enlarged sectional side view of a bent portion of a movable frame.

FIG. 10 is a schematic side view of a vertical feeding mechanism of a seedling tray.

FIG. 11 is a cross-sectional view of a vertical feeding mechanism of a seedling tray.

FIG. 12 is a rear view of a selection structure for vertically feeding seedling trays.

[Explanation of symbols]

 1 Riding transplanter 3 Transplanting device 12 Soil block seedling 20 Cup with plantation 103 Electromagnetic clutch 124 Control device 140 One-way clutch

Claims (2)

[Claims] 1. An electromagnetic clutch provided with a planting cup (20) that moves up and down, the planting cup (20) being interlockingly connected to a drive unit, and connecting and disconnecting the interlocking between the drive unit and the planting cup (20). (103) is provided, and the raising and lowering operation of the planting cup (20) is repeated by a driving device, and when the planting cup (20) comes to the descending side, the seedling (12) is planted and the planting cup (20) is When it reaches a predetermined stop position on the ascending side, the electromagnetic clutch (103) is temporarily disengaged to stop the planting cup (20), where the seedlings (12) for planting are received and a predetermined plant interval is obtained. In the power transmission device of the transplanter described above, a braking device (124) is provided for braking the up-and-down movement of the planting cup (20) when the planting cup (20) comes near a predetermined stop position. Characterized by Transplanter of the power transmission device that. 2. A one-way clutch (140) is provided between the planting cup (20) and the electromagnetic clutch (103) to prevent the planting cup (20) from moving backward. The power transmission device of the transplanter according to claim 1.