JPH1132523A - Force transmission gear for transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission gear for a transplanter capable of smoothly rotating a driving shaft of a transplanting body and improving a transplanting accuracy by installing a reverse rotation-preventing part so as to come back in the radius direction of a rotating locus of a moving body and so as to engage with the moving body when the moving body passing through the reverse rotation-preventing part, and so as to prevent the reverse rotation. SOLUTION: This transplanting gear has a transplanting body acting a lifting and lowering action by the rotation of a driving shaft 71, and transplanting seedlings on a field at the lowered side, a crutch for temporarily cutting the transmission of a power between the driving shaft 71 and a driving source when the transplanting body reaches a seedling-receiving position, a moving body 99 synchronizing and rotating with the driving shaft 91, a braking body 96 being brought into contact with the moving body 99 so that the lifting and lowering movement of the transplanting body may be braked, and a reverse rotation-preventing part 106 for preventing the reverse rotation of the moving body 99 by allowing the reverse rotation- preventing part 106 to protrude from the outer periphery locus B of the rotating locus of the moving body 99 to the radius direction to engage with the moving body 99, and installed at the rear side of the rotating direction of the moving body 99 at the seedling-receiving state of the transplanting body. The reverse rotation-preventing part 106 is constituted so as to engage with the moving body 99 and to prevent the reverse rotation by coming back in the inner radius direction of the rotation locus of the moving body 99, when the moving body 99 passing through the reverse rotation-preventing part 106.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a transplanter, an implanting means is connected to an engine via a swinging link mechanism and the like, and the implanting means is moved up and down by the rotational power of the engine. In some cases, seedlings are supplied at the time of planting, and the seedlings are transplanted by piercing the ridge at the bottom dead center. In this type of power transmission device for a transplanter, an electromagnetic clutch is provided for connecting and disconnecting the engine and the planting means. When the planting means reaches the seedling receiving position (top dead center), the electromagnetic clutch is temporarily disconnected. In some cases, the planting means is stopped (switched from on to off), the seedlings are received here, and a predetermined planting interval, which is a planting interval, is obtained by adjusting the stoppage time of the planting means.

Conventionally, in order to accurately stop the planting means,
In some cases, a braking device is provided to stop the planting means at the seedling receiving position regardless of the magnitude of the inertia of the planting means (see JP-A-9-28). This braking device is shown in FIG.
As shown in FIG. 0, the brake roller 99 (moving body) that rotates in conjunction with the rotation of the drive shaft 71 of the planting means, and when the power is cut off by the electromagnetic clutch, comes into contact with the brake roller 99 and immediately moves the planting means. Brake arm 96 to stop
(Brake body).

[0004] An engagement recess 110 is formed at an intermediate portion in the front-rear direction on the upper surface side of the brake arm 96 so as to be recessed from above and engage the brake roller 99 from above.
The bottom of the concave portion 110 coincides with the outer peripheral end locus B of the rotational locus of the brake roller 99.
9 is projected radially inward from the outer peripheral end locus B of FIG.
The front side of the rotation direction A of the brake roller 99 is a rotation restricting portion 110a for surely stopping the rotation of the drive 71 when the electromagnetic clutch 38 is disengaged. A reverse rotation preventing portion 110b for preventing the reverse rotation of the brake roller 99 when the clutch 38 is disengaged.

The brake roller 99 has a drive shaft 71 and an A
When the planting means rises and comes to a position just before the stop position after the seedlings have been planted after rotating in the direction, the brake roller 99 is located in front of the reverse rotation preventing portion 110b of the brake arm 96. When the power is disconnected by the electromagnetic clutch, the brake roller 99 rides over the reverse rotation preventing portion 110b due to inertia of the planting means or the like, and the brake roller 99
In the state fitted to 0, the movement of the planting means stops.

[0006]

However, in the above-mentioned conventional motor, the reverse rotation preventing portion 110b is provided with the brake arm 9a.
6, the brake roller 99 requires a larger force than normal rotation to get over the reverse rotation preventing portion 110b, so that the smooth rotation of the brake roller 99 is hindered. Further, when the brake roller 99 enters the engagement recess 110 from the top of the reverse rotation preventing portion 110b, the energy that the brake roller 99 has passed over the reverse rotation preventing portion 110b is given as the rotational energy of the brake roller 99. In some cases, the braking action of the restricting portion 110a or the like may be impaired, which has been a factor of reducing the planting accuracy.

Further, the brake roller 99 passes through the reverse rotation preventing portion 110b every time a seedling is planted.
10b is worn by the brake roller 99 or mud or dust. However, the amount of protrusion of the reverse rotation preventing portion 110b needs to be kept low enough to allow the brake roller 99 to climb over, and cannot be too large. Therefore, a decrease in the amount of protrusion due to wear has a great effect on the prevention of reverse rotation, and the prevention of reverse rotation cannot be ensured for a long time.

The present invention has been made in view of the above problems, and has as its object to solve the above-mentioned problems caused by the reverse rotation preventing unit.

[0009]

The present invention has taken the following technical means to achieve the above object. That is, the feature of the present invention includes a planting body that moves up and down by rotation of the drive shaft, receives seedlings on the ascending side, and plants seedlings in the field on the descending side, and when the planting body comes to the seedling receiving position. A clutch that temporarily disconnects the power transmission between the drive shaft and the drive source, and a moving body that rotates together with the drive shaft and brakes the raising and lowering operation of the planted body at the seedling receiving position. And a braking body with which the moving body comes in contact with the moving body in a rotating direction of the moving body in the seedling receiving state of the planted body, and protrudes inward from the outer peripheral end locus of the rotating locus of the moving body. A reverse rotation preventing portion for preventing reverse rotation is provided. When the moving body rotates forward, the moving body rotates in the radial direction of the moving body rotation trajectory with respect to the braking body and the engagement with the moving body is released. When the moving body passes through the reverse rotation prevention part, the moving body And returns to the radially inward direction engaged with the moving body, in that it is provided to prevent reverse rotation.

According to the above configuration, when the moving body passes through the reverse rotation preventing section in the forward rotation, the reverse rotation preventing section moves in the radial direction of the moving body rotation trajectory with respect to the brake body. Does not hinder the passage of the body. Then, when the moving body passes through the reverse rotation preventing portion, the reverse rotation preventing portion returns to a state of protruding radially inward from the outer peripheral end trajectory of the rotational trajectory of the moving body and engages with the moving body. Therefore, the moving body cannot reverse.

The reverse rotation preventing portion is provided by urging the elastic member so as to protrude radially inward from the outer peripheral end trajectory of the rotational trajectory of the moving body.
Against the urging force of the elastic body, the anti-reverse portion acts in the direction of moving the rotation preventing member in the radial direction outside the rotation trajectory of the moving body. It is preferable to provide such that it does not act in the direction in which the trajectory moves outward. In this case, when the moving body attempts to pass through the reverse rotation preventing portion from the normal rotation direction, the moving body moves the reverse rotation preventing portion outward in the rotation locus radial direction of the moving body against the elastic force of the elastic body, It can pass through the reverse rotation preventing portion smoothly. Further, when the moving body attempts to rotate in the reverse direction, the force does not act to move the reverse rotation preventing portion, so that the movement is reliably prevented.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 7, the vegetable transplanter 11
Is a walking type having a steering handle 13 at the rear part of the traveling vehicle 12, and while running in the longitudinal direction across the ridges 14, the soil block seedling is multi-film M (see FIG. 4).
Are planted at predetermined intervals on the ridges 14 covered with.

The traveling vehicle 12 includes a main frame 15, a gantry 16 provided at the front end of the main frame 15, and the like. The main frame 15 is formed of a square pipe or the like, the front part of which is bent downward and is fixed to the side of the gantry 16, and the rear part of which is bent upward so that the steering handle 1 is formed.
3 mounting part. The engine 17 is mounted on the base 16
The engine 17 is covered with a hood 18. A transmission case 19 is fixed to the rear of the gantry 16, and the power of the engine 17 is transmitted to a power transmission mechanism in the transmission case 19.

The power input into the transmission case 19 is transmitted to a wheel transmission shaft 20 projecting left and right, and a first PTO provided rearward of the wheel transmission shaft 20 and projecting left and right. It can be taken out from the shaft 21 and the second PTO shaft 22 projecting rearward and upward.
Right and left driving wheels 24 (rear wheels) are provided at the left and right ends of the wheel transmission shaft 20 via a transmission case 23 that can swing up and down around the axis.
The drive wheels 24 roll in the grooves between the ridges 14. Also, a pair of left and right front wheels 2 is provided at the front of the traveling vehicle 12.
6. A ridge height detection roller 27 is provided.

FIG. 8 shows a power transmission system of a traveling system and a PTO system.
Is transmitted to the input shaft 29. Mission case 19
A rotation shaft 30, an intermediate shaft 31, a back shaft 32, a wheel transmission shaft 20 and a first PTO shaft 21 are rotatably supported in parallel with the input shaft 29, respectively.
2 are provided so as to protrude rearward.

The gear 29a on the input shaft 29 is meshed with the idle gear 33 on the rotary shaft 30, and the clutch gear 34 is slid on the idle gear 33 so that the engagement portion is engaged, so that the input gear is engaged. Power can be transmitted from the shaft 29 to the rotating shaft 30. The clutch gear 34 is resiliently pressed in a direction in which it engages with the idle gear 33, and constitutes a pawl-type main clutch.

Between the rotating shaft 30 and the intermediate shaft 31,
Transmission 35 capable of switching between first speed (F ₁ ), second speed (F ₂ ), third speed (F ₃ ), neutral (N), and reverse (R)
Is provided. A transmission gear 3 is provided on the intermediate shaft 31.
6 and a parking brake (not shown) are provided, and the transmission gear 36 meshes with a large gear 37 fixed to the wheel transmission shaft 20. Then, from the wheel transmission shaft 20 to the transmission case 2
Power is transmitted to the drive wheels 24 via the wrapping transmission 25 in 3 so that the drive wheels 24 can be driven.

The rotating shaft 30 has one end protruding from the transmission case 19, an electromagnetic clutch 38 fixed to the outer end thereof, and a cylindrical shaft-shaped cup surrounding the outer end of the rotating shaft 30. The ring shaft 39 is rotatably supported by the transmission case 19, and the rotation of the rotary shaft 30 and the coupling shaft 39 is integrally rotated by the operation of the electromagnetic clutch 38, so that the power of the PTO system can be branched and taken out.

A gear 40 is fixed to the coupling shaft 39. The gear 40 meshes with an idler gear 41 loosely fitted on the intermediate shaft 31, and the idler gear 41 further engages with a gear 42 on the first PTO shaft 21. The gears mesh with each other to enable transmission of PTO power. A bevel pinion 43 is fixed to the first PTO shaft 21, meshes with a bevel gear 44 on the second PTO shaft 22, divides the PTO power into two systems, and takes out the power from the first PTO shaft 21 and the second PTO shaft 22. The rotation power of the first and second PTO shafts 21 and 22 can be stopped without stopping the rotation power of the wheel transmission shaft 20 by demagnetizing the electromagnetic clutch 38.

A rotation pulse sensor 45 is attached to the outer end of the rotation shaft 30 from the electromagnetic clutch 38. As the rotation pulse sensor 45, for example, one having a structure in which the proximity sensor counts the unevenness of the sprocket externally fixed to the rotation shaft 30 can be used. At the rear of the traveling vehicle 12, a transplanting operation unit 50 is provided. This transplant working unit 50
A seedling supply device 51 and a soil block seedling supplied from the seedling supply device 51 are ridged by a planting tube (planting means) 61.
4 and a multi-film perforating device 81 that preliminarily perforates a multi-film M at a position where a seedling is to be planted. The seedling supply device 51 is driven by the rotational power of the second PTO shaft 22, and the planting device 6
The zero and multi-punching device 81 is driven by the rotational power of the first PTO shaft 21.

The seedling supply device 51 is mounted on the main frame 15, and transfers the seedling tray 46 in which a large number of pot portions 46a, in which soil block seedlings are raised, are arranged in the horizontal and vertical directions. After taking out the soil block seedlings one by one from the seedling tray 46 with the seedling removal claw 52 at a predetermined seedling removal position with respect to the planting device 60, and transferring the soil block seedlings above the planting device 60, Planting cylinder 6
It is designed to be dropped into one. The seedling tray 46 is made of resin and has flexibility, and is provided with a large number of pots 46a vertically and horizontally protruding from the rear surface, and soil block seedlings are raised in each pot 46a.

A transmission shaft 54 connected to the second PTO shaft 22 is connected to the power receiving shaft 53 of the seedling supply device 51 via a universal joint, and the above-described operation is repeated by the power from the transmission shaft 54. It is. As shown in FIGS. 5 and 6, the planting device 60 and the multi-film punching device 81 are provided with the first PT of the transmission case 19.
An apparatus frame 62 supported on the O-shaft 21 so as to be vertically swingable.
Provided above. The device frame 62 is mainly composed of left and right frames 62L, 62R having a square pipe shape, and a connecting frame 62A connecting the left and right frames 62L, 62R. A bracket 64 is detachably attached to a front end of the right frame 62R by a fixing tool such as a bolt 63, and a first bearing 65 provided on a front end of the bracket 64 and a front end of the left frame 62L.
The PTO shaft 21 is inserted and supported. By removing the bracket 64 and the device frame 62 from the traveling vehicle 12, the planting device 60 and the multi-perforation device 8 are removed.
1 can be integrally removed from the traveling vehicle 12.

The rear end of the device frame 62 is suspended from the main frame 15 so as to be adjustable in the vertical direction, and a soil covering / pressure reduction roller 66 is provided at the rear of the device frame 62. The planting device 60 includes a planting tube 61 that is pierced and moved with respect to the ridge 14 to plant the soil block seedling supplied from the seedling supply device 51 at a predetermined interval.
And a swing link mechanism 67 that supports the planting cylinder 61 so as to be vertically swingable. Swing link mechanism 6
7 includes a first parallel link 68 whose upper end is pivotally supported by the apparatus frame 62 so that the lower end can freely swing back and forth.
A swing plate 69 is pivotally connected to the lower end of the first parallel link 68, a front end of the second parallel link 70 is pivotally connected to the swing plate 69, and a plant is mounted at a rear end of the second parallel link 70. The attachment cylinder 61 is pivotally connected.

As shown in FIG. 2, a bearing 72 is fixed to the upper link 70a of the second parallel link 70.
A crank shaft (drive shaft) 71 rotatably supported via left and right bearings 73 is provided between the left and right frames 62L, 62R of the device frame 62.
A crank pin 71b between one crank arm 71a is inserted into the bearing 72.

A sprocket 74 is provided at the left end of the crankshaft 72. The sprocket 74 and the first PTO
A transmission chain 76 is wound around a sprocket 75 provided at the left end of the shaft 21, so that rotational power from the engine 17 is transmitted to the crankshaft 71. The sprockets 74 and 75 and the transmission chain 76 are covered with a chain case 77, and the chain case 77 is provided with a tension roller 78 for adjusting the tension of the chain 76.

Accordingly, the power from the first PTO shaft 21 rotates the crankshaft 71 in the direction indicated by the arrow A in FIG. 1 so that the first and second parallel links 68 and 70 move the planting cylinder 61 up and down. It is configured to swing back and forth while swinging, so that when the planting tube 61 is pierced into the ridge 14 while traveling, the planting tube 61 does not substantially move forward with respect to the field. .

The planting cylinder 61 is provided with an openable / closable opener at a lower portion. When the opener enters the ridge 14 at the lower end side of the locus of the planting cylinder 71, the opener opens forward and backward by the interlocking tool 79, A transplant hole is formed in the ridge 14, and a soil block seedling can be planted in the transplant hole. A scraper 80 is provided on the rear side of the planting tube 61, and when the planting tube 61 is moved up by the swing link mechanism 67 after the planting tube 61 enters the ridge 14, the outside of the planting tube 61. The soil attached to the wall and the inner wall is scraped off.

The multi-film perforating apparatus 81 is shown in FIG.
As shown in FIG. 6 to FIG. 6, a piercing means 82 constituted by a gas burner is provided, and the piercing means 82 is connected to the apparatus frame 62 via a parallel link 83 so as to be vertically movable.
A cam roller 84 is attached to the upper link 83a of the parallel link 83.
(Cam engaging portion) is pivotally mounted. This cam roller 84
Is a disc-shaped cam 85 provided on the crankshaft 71.
The outer circumference of the roller is rolled, and the planting device 60 and the multi-perforation device 81 are driven by the same crankshaft 71, thereby simplifying the device and reducing the cost. Further, the cam roller 84 is urged by the own weight of the perforating means 82 in a direction of pressing the cam roller 84 against the outer periphery of the cam 85.

A concave portion 86 is formed in a part of the cam 85 in the circumferential direction. When the cam roller 84 falls into the concave portion 86, the perforating means 82 by its own weight as shown in FIG.
Moves downward, and the heating element 87 provided at the lower end of the perforation means 82 is moved downward.
Is pressed against the multi-film M so that a transplant hole is made in the multi-film M. The cam 85 is formed so as to raise the piercing means 82 immediately after piercing the multi-film M, and the other parts except the recessed portion 86 hold the piercing means 82 at the standby position of the ascending limit. In order to make the distance from the axis of the drive shaft 71 substantially constant, the outer periphery is formed in a substantially constant shape.

The cam 85 of this embodiment includes a first cam 88 for holding the perforating means 82 at the standby position (see FIG. 3), and moving the perforating means 82 from the standby position so that the perforating means 82 perforates the multi-film on the field. And a second cam 89 which is lowered and raised again to the standby position. That is, the second cam 89
The first cam 88 has a substantially constant outer peripheral shape, and the outer peripheral cam portion of the first cam 88 and the outer peripheral cam portion of the second cam 89 combine to form the cam 85. Is configured.

The thickness of the second cam 89 is made larger than the thickness of the first cam 88, so that the second cam 89 having the recess 86 can be reduced in abrasion while the second cam 89 has a reduced thickness. 8
The first cam 88, which does not require a member strength of about nine, is made of a thin plate to reduce the weight of the apparatus and reduce the member cost.
The first cam 88 is fixed to the crankshaft 71, and the second cam 89 is connected to the first cam 88 so as to be able to adjust the relative angle around the crankshaft 71 axis. In this embodiment, bolt holes (not shown) are provided in the first cam 88 at two locations in the circumferential direction, and an arc-shaped long hole 90 communicating with the bolt holes is formed in the first cam 88. The first cam 8 is provided on the second cam 89 by inserting a bolt 91 into the bolt hole and the elongated hole 90 and fastening a nut (not shown).
8 and the second cam 89 can be fastened and fixed. When the bolt 91 is loosened slightly, the first
The relative angle between the cam 88 and the second cam 89 can be adjusted.

A nut 92 is provided near the drive shaft 71 on the side surface of the second cam 89, and an angle adjusting bolt 93 is screwed to the nut 92. A loosening prevention coil spring 94 is interposed between the nut 92 and the bolt head of the bolt 93. On the side of the first cam 88,
An engaging portion 95 with which the tip end of the bolt 93 contacts is provided. By slightly loosening the fastening force between the first cam 88 and the second cam 89, the bolt 93 is screwed toward the engaging portion 95. Fine adjustment of the relative angle between the first cam 88 and the second cam 89 can be easily performed.

The engaging portion 95 of the first cam 88 is disengaged from the engaging portion 95 even if the tip of the bolt 93 is slightly displaced from the first cam 88 by screwing the bolt 93. It is formed in a long shape in a direction orthogonal to the axis of the bolt 93 so as not to be present. Further, the device frame 62 includes:
An upper limit detection proximity switch 101 for detecting that the transplanting cylinder 61 is at the top dead center of the trajectory is provided. The switch 101 is mounted on a left bearing 73 that supports the crankshaft 71. When the crank arm 71a reaches the upper limit position, the switch 101 is turned on, and the electromagnetic clutch 38 is turned on (connected) off (disconnected). To the transplanting operation unit 5 without stopping the traveling of the traveling vehicle 12.
By temporarily stopping the drive of 0, the planting interval of the soil block seedlings is controlled. Then, when the rotation pulse sensor 45 detects a preset number of pulses, the electromagnetic clutch 38 is switched from off to on, and the operation of the transplanting work unit 50 is restarted.

When the electromagnetic clutch 38 is demagnetized and the drive by the crankshaft 71 is stopped, regardless of the magnitude of the inertia of the planting tube 61 or the like, the planting tube 61
Braking device 10 to stop braking at a certain position in the middle of the trajectory
2 are provided. As shown in FIGS. 1 to 4, the braking device 102 mainly includes a brake arm (braking body) 96 and a brake roller (moving body) 99.

The brake arm 96 is formed of a longitudinally disposed plate material which is long before and after, and has a boss 96a at the front end side. The boss 96a is attached to a support shaft 103 fixed to the right frame 62R of the apparatus frame 62. The front portion of the brake arm 96 is rotatably supported around a left-right axis. A U-shaped bracket 104 is disposed on the rear upper side of the brake arm 96 and is fixed to the right frame 62R of the device frame 62. The upper wall 104a of the bracket 104 passes through the upper wall 104a. The hanging bolt 105
A lock nut 106 is disposed above and below the upper wall 104a and screwed to a hanging bolt 105 to be fixedly mounted. A cushioning member 98 made of an elastic material or the like is attached and fixed to the lower surface of the lower wall 104b of the bracket 104.

The engaging bolt 105 and the brake arm 9
A tension coil spring 97 is interposed between the rear end 6 and the rear end side. The urging force of the coil spring 97 urges the brake arm 96 to rotate upward about the axis of the support shaft 103. In addition, the rotation is regulated by the contact of the brake arm 96 with the buffer member 98.

The biasing force of the coil spring 97 can be adjusted by loosening the lock nut 106 and adjusting the vertical position of the engaging bolt 105. The brake roller 99 is formed of rubber or the like, and is located above the brake arm 96 so that the first
The cam 88 is rotatably mounted and supported around a left and right axis via a pivot 107 so as to rotate together with the crankshaft 71 in the direction A.

An intermediate portion of the upper surface side of the brake arm 96 in the front-rear direction is formed to project upward, and the electromagnetic clutch 38 is provided.
The rotation restricting portion 100 serves to reliably stop the rotation of the crankshaft 71 when the crankshaft 71 is turned off. Further, the brake arm 96 rotatably supports a substantially L-shaped reverse rotation preventing plate 101 in a side view with the support shaft 103 fixed to the right frame 62R as a rotation axis. This reverse rotation prevention plate 1
01 is provided with a reverse rotation preventing portion 106 extending rearward from the rotation axis, and is interposed between a lower end portion 101a extending downward from the rotation axis of the reverse rotation prevention plate 101 and the lower side of the brake arm 96. By the urging force of the tension coil spring (elastic body) 104, the reverse rotation preventing unit 106 is urged to rotate upward around the axis of the support shaft 103. Further, the rotation of the reverse rotation preventing plate 101 is regulated by a stopper 96b provided below the brake arm 96.

Note that this stopper is used to
May be provided at other positions such as the right frame 62R,
Another spring or the like for urging the reverse rotation preventing plate 101 in the reverse direction may be provided, and the rotation of the reverse rotation preventing plate 101 may be restricted by a balance with the spring. As shown in FIG. 1, in a state where the rotation is restricted by the stopper 96 b, the upper end portion 106 a of the reverse rotation preventing portion 106 is located above the upper end of the brake arm 96, and It has a protruding shape.

A concave portion 105 formed between the rear end 106b of the reverse rotation preventing portion and the rotation restricting portion 100 is a stop position of the brake roller 99, and a bottom portion of the concave portion 105 has a rotation locus of the brake roller 99. Of the outer peripheral end locus B. Therefore, the upper part of the reverse rotation prevention unit 106
It is located within the radius of the outer peripheral end locus (B) of the rotation locus of the brake roller 99.

In the above configuration, the brake roller 99 rotates together with the crankshaft 71 in the direction A, and when the planting cylinder 61 rises and comes to a position just before the stop position after the seedlings are planted, the brake roller 99 is rotated. Is the upper end portion 106 of the reverse rotation prevention portion.
a. When the implanting cylinder 61 comes to the stop position and the electromagnetic clutch 38 is demagnetized and the power to the transplanting working unit 50 is cut off, the cam 85 slightly rotates due to the inertia of each operating unit of the transplanting working unit 50. . This rotational force acts in a direction to push down the reverse rotation prevention unit 106, and the spring 104
The anti-reverse portion 106 rotates against the urging force of the brake arm 96 and moves downward with respect to the brake arm 96, that is, the brake roller 99.
Is pushed downward in the radial direction of the rotation locus of the brake roller 9.
9 is a state in which the engagement with the reverse rotation prevention unit 106 is released,
It can pass through the reverse rotation prevention unit 106.

Here, the spring force of the spring 104 may be light enough to urge the reverse rotation preventing plate 101 upward, so that the resistance against the brake roller 99 which pushes down the reverse rotation preventing portion 106 and passes therethrough is small. As a result, the rotation of the brake roller 99 becomes smooth, and the rotation noise is reduced. When the brake roller 99 completely passes through the reverse rotation preventing portion 106, the rotation restricting portion 100
5, the movement of the transplant cylinder 61 stops. At this time, the reverse rotation prevention unit 106 returns upward by the urging force of the spring 101. The reverse rotation of the brake roller 99 comes into contact with the rear end 106b of the reverse rotation preventing unit 106, but the rear end 106b of the reverse rotation prevention unit 106 is substantially perpendicular to the reverse rotation direction of the brake roller 99, and the reverse rotation direction is opposite. Since the force of the brake roller 99 acts substantially toward the rotation axis of the reverse rotation preventing portion, the force does not act in the direction of pushing down the reverse rotation preventing portion 106. Therefore, the brake roller 99 is connected to the reverse rotation prevention unit 10.
6 is in a state of being engaged with, and cannot cross over the reverse rotation preventing portion 106, thereby preventing reverse rotation. Further, the brake roller 99 does not have enough force to get over the rotation restricting portion 100 and the reverse rotation preventing portion 106 against the urging force of the spring 97 interposed between the engaging bolt 105 and the brake arm 96, so Is prevented from rotating and reversing. Thereby, the transplantation cylinder 61 can be always stopped at a fixed position in the middle of the trajectory, and the operation stability is improved.

Further, since the reverse rotation preventing portion 106 is movable, the amount of projection does not significantly affect the resistance of the brake roller passing by the forward rotation, and the amount of projection of the reverse rotation preventing portion can be increased. Prevention can be achieved.
Furthermore, since the resistance to the brake roller 99 passing through the reverse rotation preventing unit 106 in the forward rotation is low, even when the rotation of the engine is low, the crankshaft 71 rotates stably, and the planting accuracy is stabilized.

FIG. 10 shows another embodiment of the present invention, in which a reverse rotation preventing unit 106 is provided inside a brake arm 96 so as to be linearly movable inward and outward of the rotation locus diameter of the moving body 99. The moving body 99 is provided by a spring 108 provided at the lower end of the reverse rotation preventing portion 106.
It is urged in the radial direction of the rotation locus. The other configuration is the same as that of the above embodiment.

In the above embodiment, the present invention is applied to a walking type transplanter, but can be applied to a riding type transplanter. Further, the present invention can be applied to a multi-row transplanter.

[0046]

According to the present invention, the moving body that rotates forward can pass through the reverse rotation preventing portion smoothly, so that the rotation is stabilized and the planting accuracy is stabilized.

[Brief description of the drawings]

FIG. 1 is a side view of a braking device according to the present invention.

FIG. 2 is a plan view of a main part.

FIG. 3 is a side view showing a main part of the multi-film punching device.

FIG. 4 is a side view of the multi-film punching device, showing a state in which the punching means is moved downward.

FIG. 5 is an overall schematic side view of a multi-film punching device and a planting device.

FIG. 6 is a plan view of the same.

FIG. 7 is an overall side view of the transplanter.

FIG. 8 is a system diagram showing a power transmission system of a traveling system and a PTO system.

FIG. 9 is a side view showing another embodiment of the present invention.

FIG. 10 is a side view showing a conventional braking device.

[Explanation of symbols]

 17 Engine (drive source) 38 Electromagnetic clutch 61 Planting cylinder (planting body) 71 Crankshaft (drive shaft) 96 Brake arm (braking body) 99 Brake roller (moving body) 104 Coil spring (elastic body) 106 Reverse rotation prevention unit A Rotation direction

Claims (2)

[Claims] 1. A planting body (61) that moves up and down by rotation of a drive shaft (71), receives a seedling on an ascending side, and implants a seedling in a field on a descending side. When the drive shaft (7
1) a clutch (38) for temporarily disconnecting power transmission between the drive source (17) and a moving body (9) that rotates together with the drive shaft (71);
9) and a braking body (9) contacted by the moving body (99) at the seedling receiving position so as to brake the raising / lowering operation of the planted body (61).
6), the rear of the moving body (99) in the rotation direction in the seedling receiving state of the planted body (61) protruding radially inward from the outer peripheral end locus (B) of the rotating locus of the moving body (99). A reverse rotation preventing portion (106) is provided for preventing the moving body (99) from rotating in reverse by engaging with the moving body (99). The reverse rotation preventing section (106) rotates the moving body (99) forward. Sometimes, the moving body (99) with respect to the braking body (96)
When the moving body (99) passes through the reverse rotation preventing portion (106) when the moving body (99) is moved outward in the rotation locus radial direction and disengaged from the moving body (99) to allow the moving body (99) to pass therethrough,
The moving body (99) returns to the rotation locus radially inward direction and moves to the moving body (9).
(9) A transmission for an implanting machine, which is provided so as to engage with (9) and prevent reverse rotation. 2. The reverse rotation preventing portion (106) is provided by being urged by an elastic body (104) so as to protrude radially inward from the outer peripheral end locus (B) of the rotational locus of the moving body (99). The force of the moving body (99) rotating in the forward direction is controlled by the elastic body (10).
Against the urging force of 4), the anti-reverse portion (106) acts in a direction to move the rotation-preventing portion (106) in a direction outside the rotation locus of the moving body (99). The power transmission device according to claim 1, wherein the reverse rotation preventing portion (106) is provided so as not to act in a direction of moving the rotating body of the moving body (99) outside the rotation trajectory radial direction.