JP3765120B2 - Seedling planting machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is used for a seedling planting machine for transplanting seedlings in paddy fields.
[0002]
[Prior art]
This type of seedling planter is provided with a driving device that lifts and lowers the seedling planting device on the traveling vehicle body whose wheels rotate on the tiller and move forward, and the sensor float is placed around the rear horizontal axis on the seedling planting device. It is mounted so as to slide on the mud surface while swinging, and when the tip of the sensor float moves up and down, the drive device raises and lowers the seedling planting device so that the seedling planting device is kept at a certain height even if the cultivation board is shallow The sensor float and the driving device are connected so as to be maintained.
[0003]
[Problems to be solved by the invention]
In the seedling planter, when the seedling planter is moved backwards to the position where the seedling planting is started and the main shift lever is moved forward to start the seedling planting operation, the seedling planting work is started from the aligned position. It is an object of the present invention to start easily and improve workability.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a traveling vehicle body (1) in which wheels (7, 8) to which power from an engine (9) is transmitted via a main transmission rotate on a cultivation board and advance. The seedling planting device (2) is provided so as to be moved up and down by a hydraulic cylinder (3) , and the oil discharged from the pump (29) passes through the lifting and lowering electromagnetic valve (30) whose duty ratio is controlled, and the hydraulic cylinder ( 3) When entering, the seedling planting device (2) rises, and when the oil in the hydraulic cylinder (3) returns to the tank (31), the seedling planting device (2) descends, and the sensor float (43) serves as the seedling. It is attached to the planting device (2) so as to slide around the mud surface while swinging around the rear horizontal axis (46) , and is connected to the front end of the sensor float (43) via a link (64). An arm (62) is provided, and the first pin provided on the arm (62) 66) and a second pin (60) that moves up and down with an inner wire (61b), a first spring (67) and a second spring (68) are provided on both ends, and the second spring ( 68) is provided with a long hole at the lower end, and the first pin (66) is inserted into the long hole, and when the inner wire (61b) is loosened, the front end of the sensor float (43) The arm (62) swings while expanding and contracting only the first spring (67), and when the inner wire (61b) is pulled, the arm (62) resists the first spring (67) and the second spring (68). Thus, the front end of the sensor float (43) is raised, and the pressure sensor (32) for detecting the pressure (P) in the hydraulic cylinder (3) and the rotation (E) of the pump (29) are detected. Pump rotation sensor (26) and sensor float (43) The angle of attack sensor (47) for detecting the angle of attack (A '), the vehicle speed sensor (14) provided on the shaft (8a) between the main transmission and the wheels (7, 8), and the sensitivity of the operator. In a seed transplanter provided with a sensitivity setting dial (49) that can be set, the square of the vehicle speed (B) output from the vehicle speed sensor (14) to the sensitivity (A0) set by the sensitivity setting dial (49). The angle of attack correction value (A) is calculated by adding a value obtained by multiplying the first constant (k1) to the angle of attack, and the angle of attack detected by the angle of attack sensor (47) when the sensor float (43) rises forward. When (A ') is larger than the angle-of-attack correction value (A), the value obtained by multiplying the vehicle speed (B) by the second constant (k2) is divided by the rotation (E) of the pump (29). The output pulse width (Wu) is calculated, and the lifted electromagnetic valve (3 0) is actuated to raise the seedling planting device (2), and the angle of attack (A ') detected by the angle of attack sensor (47) when the sensor float (43) is moved forward and downward is the angle of attack correction value. When the speed is smaller than (A), the value obtained by multiplying the vehicle speed (B) by the third constant (k3) is divided by the square root of the pressure (P) in the hydraulic cylinder (3), and the descending output pulse width (Wd ) And the raising / lowering electromagnetic valve (30) is operated with the descending output pulse width (Wd) to lower the seedling transplanter (2), so that the descending speed becomes higher than the ascending speed as the vehicle speed (B) increases. In an “automatic” state in which the seedling planting device (2) automatically moves up and down so that it is maintained at a certain height from the mud surface, and the height set by the seedling planting device (2) switchable position lever to the "position" state (50) is provided which, before Position lever (50) is set to push up and NaeUe equipment (2) cut rises to planting clutch is when the "automatic" state, pressing down and NaeUe enter or cut of descent or planting clutch device (2) A finger lever (52) configured to perform reverse rotation and a main transmission lever (22) that can be switched to reverse are provided in the traveling vehicle body (1), and detects that the main transmission lever (22) is switched to reverse. A main transmission lever sensor (23 ) for inputting to the control device (15) is provided, and the control device (15) seeds when the position lever (50) is in the “automatic” state and the main transmission lever (22) is switched to the reverse direction. planting apparatus (2) becomes off the planting clutch rises, then in preference to a signal from the push down the finger lever (52) main shift lever sensor (23) descends seedling planting apparatus (2) That was pushed down the planting clutch is entered constituting the finger lever (52) and the seedling planting machine according to features.
[0005]
[Action]
The seedling transplanter configured as described above moves forward with the wheels 7 and 8 of the traveling vehicle body 1 rotating on the paddy field, and the seedling transplanter 2 transplants the seedling onto the mud surface during this advancement. Make an article. When the wheels 7 and 8 come to a deep position in the cultivator during the transplanting operation with the position lever 50 in the “automatic” state, the seedling planter sinks from the mud surface. Then, when the front end of the sensor float 43 is pushed up by the mud surface and the angle of attack A ′ detected by the angle of attack sensor 47 becomes larger than the angle of attack correction value A , the hydraulic cylinder 3 raises the seedling planting device 2. The height from the mud surface of the seedling planting device 2 returns to the limit. On the contrary, when the wheels 7 and 8 come to a shallow place on the cultivator, the seedling transplanter rises from the mud surface. Then, when the front end of the sensor float 43 is lowered and the angle of attack (A ′) becomes smaller than the angle of attack correction value (A) , the hydraulic cylinder 3 lowers the seedling planting device 2, and mud of the seedling planting device 2. The surface height returns to the limit. When the finger lever 52 is pushed up when the position lever 50 is in the “automatic” state, the seedling device 2 is raised and the planting clutch is disengaged, and when the finger lever 52 is pushed down, the planting device 2 is lowered or the planting clutch is engaged. Or cut. Further, when the position lever 50 is in the “automatic” state and the main transmission lever 22 is switched to the reverse movement, the seedling planting device 2 is raised and the planting clutch is disengaged. When the finger lever 52 is pushed down, the seedling planting device 2 descends in preference to the signal from the main transmission lever sensor 23, and when the finger lever 52 is further pushed down, the planting clutch is engaged.
[0006]
【effect】
As described above, according to the present invention, when the position lever 50 is in the “automatic” state and the main transmission lever 22 is switched to reverse, the seedling planting device 2 is raised and the planting clutch is disengaged, but the finger lever 52 is pushed down. The seedling planting device 2 descends in preference to the signal from the main transmission lever sensor 23, and when the finger lever 52 is further pushed down, the planting clutch is engaged. When the main shifting lever 22 is moved forward to start the seedling planting operation, the seedling planting operation can be easily started from the aligned position, and workability is improved.
[0007]
【Example】
Next, an embodiment of the present invention will be described.
As shown in FIG. 1 and FIG. 2, a seedling planting device 2 is attached after the traveling vehicle body 1 so as to be moved up and down by a drive device (hydraulic cylinder) 3 to form a seedling transplanter.
The traveling vehicle body 1 is configured as follows. A main gear box 5 and a rear wheel gear box 6 are provided before and after the frame 4, and front wheels 7 and 7 and rear wheels 8 and 8 are attached to both sides of each. After the engine 9 is mounted in the middle of the frame 4 and the rotation of the crankshaft 10 is transmitted to the intermediate shaft 11 by a belt, a belt converter (Belcon) 12 (the speed changes between the left and right discs of the train). The main shaft 13 is reached. The rotation is adjusted to a predetermined speed by a main transmission (not shown) in the main gear box 5 and reaches the front wheels 7 and 7 and the rear wheels 8 and 8, which rotate on the paddy field. Thus, the traveling vehicle body 1 is made to travel. A vehicle speed sensor 14 is provided on the rear axle 8a (possible with an axis between the main transmission and the wheels 7 and 8), and a vehicle speed output B of the traveling vehicle body 1 is input to the control device 15 (FIG. 3). The vehicle speed output B can be calculated by inputting the rotational speed of the crankshaft 10 and the gear ratio of the bell converter 12 to the control device 15 and multiplying them by the reduction ratio of the transmission path, the transmission efficiency, and the like.
[0008]
A seat 16 is provided on the engine 9, and the control device 15 is accommodated in a control box 17 attached to the right of the seat 16. A handle frame 18 is provided on the main gear box 5, a handle post 19 protrudes upward therefrom, and a steering handle 20 is attached to the protruding end thereof. The auxiliary transmission lever 21 is provided on the right side of the handle frame 18 so that when the upper end is moved forward, the rotation of the main shaft 13 is accelerated by the Belcon 12 and when the movement is performed later, the rotation is decelerated. A main transmission lever 22 is provided on the left side of the handle frame 18 so that the main transmission gives the wheels 7 and 8 a “fast” road speed, a “slow” seedling speed and a “reverse” operation. It is made. A main transmission lever sensor 23 (FIG. 3) is provided at the base thereof, and inputs the selected speed state to the control device 15.
[0009]
A column 24 extends upward from the rear portion of the frame 4, and both ends of a pair of parallel links 25, 25 are attached to the vertical frame 27 so as to be rotatable, thereby forming a parallel link. The front end of the hydraulic cylinder 3 is attached to the frame 4, the piston rod 3a extends obliquely upward from the rear end, and the lower end of the arm 28 integrated with the upper link 25 is connected to the protruding end. When the pump 29 is attached to the intermediate shaft 11 and the oil discharged from the pump 29 enters the hydraulic cylinder 3 via the elevating electromagnetic valve 30 (FIG. 3), the piston rod 3a protrudes and the vertical frame 27 rises. When returning to the tank 31, the vertical frame 27 is lowered. A pressure sensor 32 (FIG. 3) is attached to the hydraulic cylinder 3, and the pressure output P therein is input to the control device 15. A pump rotation sensor 26 (FIG. 3) is attached to the intermediate shaft 11, and the rotation output E of the pump 29 is input to the control device 15.
[0010]
The seedling planting device 2 is configured as follows. A planting gear box 33 is attached to the lower part of the vertical frame 27. The clutch case 34 is fixed to the support 24, and a part of the power in the main gear box 5 is transmitted to the PTO shaft 35 by the PTO shaft 35, and then introduced into the planting gear box 33 by the propeller shaft 36. A planting clutch (not shown) is provided in the clutch case 34, and the rotation transmitted from the PTO shaft 35 to the propeller shaft 36 by the operation of the clutch solenoid 37 (FIG. 3) is "on" and "off". ing. A seedling mounting table 38 inclined forward is arranged on the planting gear box 33, and six mat seedlings are placed side by side and are driven to reciprocate left and right by the power in the planting gear box 33. ing. Three planting frames 39, 39, 39 extend from the planting gear box 33 under the rear part of the seedling stand 38 and are provided with rotating cases 40, 40. An L-shaped seedling receiving plate 41 is fixed to the planting frames 39, 39, 39 so as to block the rear end of the seedling mounting table 38, and the end of the mat seedling mounted on the seedling mounting table 38 protrudes thereon. To move left and right. When a pair of seedling vegetation baskets 42 and 42 are attached to the respective rotating cases 40 and the rotating case 40 is rotated counterclockwise around the central horizontal axis by the power in the planting gear box 33, the seedling vegetation 42 , 42 swivel in the same posture, and alternately pass through the seedling receiving opening of the seedling receiving plate 41 at the initial stage of the descending to cut out one seedling from the end of the mat seedling, The seedlings are inserted into the paddy field.
[0011]
Side floats 44, 44 are arranged on both sides of the sensor float 43, and each rear part is rotatably attached to a lower end of each arm 45 extending obliquely downward from the planting gear box 33 by a horizontal shaft 46. The muddy surface is slid while swinging as the traveling vehicle body 1 moves forward. An angle-of-attack sensor 47 is attached to the front of the planting gear box 33, and its arm 47 a is connected to the front part of the sensor float 43 by a link 48, and the angle-of-attack output A ′ of the sensor float 43 is input to the control device 15. (Fig. 3).
[0012]
A sensitivity adjustment dial 49 is provided on the control box 17, and the sensitivity output A0 set by the operator (when the mud surface is soft, the seedling planting device 2 moves up and down quickly by the vertical movement of the front end of the sensor float 43, and when it is hard, Is set in the controller 15 so as to slow down the elevation.
The position lever 50 protrudes obliquely forward on the right side of the seat 16 and can be rotated up and down. A position sensor 51 (FIG. 3) is provided at the base, and when the position lever 50 is at a position “position” above “automatic” as shown in FIG. It outputs to the raising / lowering electromagnetic valve 30, and the seedling planting device 2 moves up and down to the height set by the position lever 50 and stops. When the position lever 50 is moved to “automatic” from now on, the seedling planting device 2 is lowered and the sensor float 43 comes into contact with the mud surface. Thereafter, the seedling planting device is automatically moved up and down by the vertical movement of the front end of the sensor float 43 ( (Automatic lifting). Further, when the position lever 50 is lowered to “planting clutch engaged”, the clutch solenoid 37 sets the planting clutch “entered” by the output of the control device 15 while maintaining the above automatic elevation, and the seedling mounting table 38 is reciprocated. And the seedling ridges 42, 42... Are started.
[0013]
When the finger lever 52 protrudes to the right from the handle post 19 and the position lever 50 is “automatic”, the control device 15 moves up and down by a signal from the lift sensor 53 (FIG. 3) of the base when the protrusion is pushed up intermittently. Outputs to the electromagnetic valve 30 and the clutch solenoid 37 are performed to raise the seedling planting device 2 and “disconnect” the planting clutch. When the seedling planting device 2 is depressed, the seedling planting device 2 descends or the planting clutch “enters” or “disconnects”. "Is made to be performed.
[0014]
In addition, the main transmission lever 22 selects the “slow” seedling planting speed, the position lever 50 is set to “automatic”, and the seedling planting operation is carried out while the seedling plant is advanced in the planting clutch “on” state. When the main clutch (between the engine 9 and the transmission) is turned off and the position of the main transmission lever 22 is changed to “reverse”, the control device 15 receives the clutch solenoid in response to an input from the main transmission lever sensor 23. 37 and the elevating electromagnetic valve 30 , the planting clutch is “disengaged” and the seedling planting device 2 is raised, and when the main clutch is “on”, the planting machine is configured to move backward. Then, after the reverse by a predetermined distance, and the main clutch to "Off", the controller 15 signals to preferentially from the finger lever 52 of the end push down the main shift lever 22 is a lift solenoid valve 30 When the seedling planting device 2 operates so as to descend, and when the finger lever 52 is further pressed down, the clutch solenoid 37 is operated so that the planting clutch is “entered”. For this reason, when the seedling planting machine is moved backwards to the position of the seedling planting start and the main shift lever 22 is moved forward to start the seedling planting work, the seedling planting work starts easily from the aligned position. This improves workability.
[0015]
The seedling planting device 2 of the seedling planter moving forward automatically operates as shown in the flowchart of FIG. 5, k1, k2, and k3 are constants, and Wu and Wd are the rising pulse width and the falling output pulse width of the lifting electromagnetic valve 30 controlled by the duty ratio.
That is, when starting, the control device 15 reads the vehicle speed output B from the vehicle speed sensor 14, the angle of attack A 'of the sensor float 43 from the angle of attack sensor 47, and the sensitivity output A0 set by the operator from the sensitivity adjustment dial 49. The angle-of-attack correction value A of the sensor float 43 is calculated by the following equation. Next, A and A 'are compared, and if the angle of attack A' of the sensor float 43 is within the dead zone, the process proceeds downward without returning to the start. When A 'is larger than A (the sensor float 43 moves forward), it proceeds to the left to read the pump rotation E from the pump rotation sensor 32 and proceeds downward to calculate the ascending output pulse width Wu of the elevating electromagnetic valve 30 Then, it further goes down, the lifting electromagnetic valve 30 is operated with the pulse width Wu, oil is supplied to the hydraulic cylinder 3, and the seedling planting device 2 is raised. If A ′ is smaller than A (sensor float 43 is moved forward and downward), the pressure P moves from the pressure sensor 31 to the right to read the pressure P in the hydraulic cylinder 3 and proceeds downward to lower the output of the lift solenoid valve 30 . The pulse width Wd is calculated, and the operation proceeds further downward. The lift electromagnetic valve 30 is operated with the pulse width Wd, the oil in the hydraulic cylinder 3 is returned to the tank 31 , and the seedling planting device 2 is lowered.
[0016]
According to this configuration, the raising / lowering of the seedling planting device 2 is performed based on a correction value corrected with a coefficient including the square of the vehicle speed of the seedling transplanter, so that the influence of the vehicle speed on the vertical movement of the front end of the sensor float 43 is affected. Excluded, the height of the mud surface of the seedling planting device 2 is appropriately determined, and the descending speed is increased in proportion to the vehicle speed, so that floating seedlings at high speed work can be prevented. It is more effective to set k2 and k3 so that the descending speed becomes higher than the ascending speed as the vehicle speed increases.
[0017]
In addition, the control apparatus 15 can be comprised so that the seedling planting apparatus 2 may operate | move based on the flowchart of FIG. FIG. 6 is intended to improve the leveling ability regardless of the hardness of the field by correcting the ascending speed and the descending speed in accordance with the set value of the sensitivity adjustment dial 49 in addition to that of FIG.
The sensitivity adjustment device of the sensor float 43 is configured as shown in FIGS. 7 and 8, and in the main sensitivity (used in fields where mud is of a standard hardness or less), the angle-of-attack sensor 47 is expanded and contracted by a single spring. Can be provided so that the output of the angle-of-attack sensor 47 changes due to the expansion and contraction of a plurality of springs with subsensitivity (used in fields where mud is hard). Then, in a hard field, the load that suppresses the rise of the front end of the sensor float 47 increases, and hunting of the raising / lowering of the seedling planting device 2 due to frequent operation of the sensor float 47 can be prevented.
[0018]
That is, the arm 45 is provided so as to rotate about the axis of the shaft 45a at the front end, and when the rear end moves up and down by operating the depth adjustment lever 53, the rear part of the sensor float 43 moves up and down to plant seedlings. The attachment depth can be adjusted. A pair of support plates 54, 54 are fixed to both sides of the flange 33 a of the planting gear box 33. The front and rear ends of the links 55, 55,... Arranged in parallel in the vertical and horizontal directions are rotatably attached to the support frame 56 to form a parallel link. The upper links 55, 55 and the subsequent shaft 57 can be integrated, the arm 58 extends downward, the protruding end and the depth adjusting lever 53 are connected by the rod 59, and the rear end of the arm 45 moves up and down. 56 is made to move up and down in the same direction. The support frame 56 is made by bending the plate into a C shape when viewed from the front, and a reception angle sensor (potentiometer) 47 is attached to the left piece. The pin 60 is supported by the long hole 70 on the right piece. An end of the inner wire 61b protruding from the outer wire 61a is attached to the pin 60, and is moved up and down by pushing and pulling. The middle of the arm 62 is pivotally attached to the shaft 63 at the front end of the upper links 55, 55, the rear end is connected to the front end of the sensor float 43 by the link 64, and the front end of the arm 62 is the angle of attack sensor by the rod 65. It is connected to 47 arms 47a. A pin 66 is provided at the front portion of the arm 62, and both ends of three springs 67, 68, 69 are hung on the pin 60. Each of the springs 68 and 69 has a long hole portion at the lower end in order, and the pin 66 is inserted into the long hole portion.
[0019]
For the main sensitivity, the inner wire 61b is loosened and set so that the pin 66 is idle with the long holes of the springs 68 and 69. Then, when the front end of the sensor float 43 moves up and down, the arm 62 swings while expanding and contracting only the spring 67. This swing is transmitted to the arm 47a by the rod 65, and the output of the angle sensor 47 changes. In the secondary sensitivity, the inner wire 61b is pulled and the pin 60 is pulled up to apply an initial tension to the spring 67, and the lower end of the long hole of the spring 68 (and the lower end of the long hole of the spring 69) is used in contact with the pin 66. Then, the front end of the sensor float 43 is raised against the springs 67 and 68 (and further the spring 69), and the movement becomes slow. When the output of the angle-of-attack sensor 47 in this configuration is corrected and used by the square of the output B from the vehicle speed sensor 14 as described above, the accuracy of raising and lowering the seedling planting device 2 is further improved.
[Brief description of the drawings]
FIG. 1 is a side view of a seedling planting machine according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a block diagram thereof, and FIG. 4 is an operation diagram of its position lever. FIG. 7 is an enlarged side view of a part of another seedling planting machine. FIG. 8 is a plan view of the developed part.
1 traveling vehicle body 2 seedling planting device 3 drive device (hydraulic cylinder)
7 wheels (front wheels)
8 wheels (rear wheel)
15 Control device 22 Main transmission lever 23 Main transmission lever sensor 43 Sensor float 46 Horizontal axis 50 Position lever 52 Finger lever

Claims (1)

The seedling planting device (2) is connected to the hydraulic cylinder (3) on the traveling vehicle body (1) in which the wheels (7, 8 ) to which the power from the engine (9) is transmitted via the main transmission rotate on the tiller and move forward. ), And the oil discharged from the pump (29) enters the hydraulic cylinder (3) via the lifting electromagnetic valve (30) whose duty ratio is controlled. When the oil in the hydraulic cylinder (3) rises and returns to the tank (31), the seedling planting device (2) is lowered, and the sensor float (43) is attached to the seedling planting device (2) on the horizontal axis (46 The arm floats around the mud surface while swinging around the sensor float (43) and is connected to the front end of the sensor float (43) via a link (64). ) With the first pin (66) and inner wire (61b) A first spring (67) and a second spring (68) having both ends hung on a moving second pin (60) are provided, and a long hole portion is provided at the lower end of the second spring (68). The first pin (66) is inserted into the elongated hole, and when the inner wire (61b) is loosened, the arm (62) is moved to the first position when the front end of the sensor float (43) moves up and down. Of the sensor float (43) against the first spring (67) and the second spring (68) when the inner wire (61b) is pulled when the inner wire (61b) is pulled. The pressure sensor (32) for detecting the pressure (P) in the hydraulic cylinder (3), the pump rotation sensor (26) for detecting the rotation (E) of the pump (29), and the sensor float Angle of attack sensor for detecting angle of attack (A ') of (43) 47), a vehicle speed sensor (14) provided on the shaft (8a) between the main transmission and the wheels (7, 8), and a sensitivity setting dial (49) that allows the operator to set the sensitivity. In the seedling transplanter, a value obtained by multiplying the square of the vehicle speed (B) output from the vehicle speed sensor (14) by the first constant (k1) to the sensitivity (A0) set by the sensitivity setting dial (49). In addition, the angle-of-attack correction value (A) is calculated, and the angle of attack (A ′) detected by the angle-of-attack sensor (47) when the sensor float (43) rises forward is the angle-of-attack correction value (A). Is greater than the vehicle speed (B) multiplied by a second constant (k2) divided by the rotation (E) of the pump (29) to calculate a rising output pulse width (Wu), and this rising output Raise the seedling planting device (2) by operating the lifting electromagnetic valve (30) with the pulse width (Wu) When the sensor float (43) moves forward and the angle of attack (A ') detected by the angle of attack sensor (47) is smaller than the angle of attack correction value (A), the vehicle speed (B) The value obtained by multiplying the constant of 3 (k3) is divided by the square root of the pressure (P) in the hydraulic cylinder (3) to calculate the descending output pulse width (Wd), and the descending output pulse width (Wd) is used to increase and decrease By operating the electromagnetic valve (30) to lower the seedling planting device (2), the lowering speed becomes higher than the rising speed as the vehicle speed (B) increases, and is kept at a constant height from the mud surface. A position lever (50) that can be switched between an “automatic” state in which the seedling planting device (2) automatically moves up and down so that it can lean, and a “position” state in which the seedling planting device (2) moves up and down to a set height. provided, said position lever (50) is shaped "automatic" When it is pushed up, the seedling planting device (2) rises and the planting clutch is disengaged, and when pushed down, the finger lever (52) is configured to lower the seedling planting device (2) or to engage or disengage the planting clutch. A main shift lever (22) that can be switched to reverse is provided on the traveling vehicle body (1), and the main shift lever (22) that detects that the main shift lever (22) is switched to reverse is detected and input to the control device (15). A shift lever sensor (23) is provided, and the control device (15) moves the planting device (2) upward when the position lever (50) is in the “automatic” state and the main shift lever (22) is switched to the reverse position. When the attached clutch is disengaged and then the finger lever (52) is depressed, the seedling planting device (2) descends in preference to the signal from the main transmission lever sensor (23), and the finger lever (52) is further depressed. Planting seedling planting machine, characterized in that the clutch is configured as to be entered.

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