JP2002095315A - Clutch in planting part of rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch in a planting part of a rice transplanter, capable of easily making multi-line plantings and having an improved function. SOLUTION: In the planting part 15 of the rice transplanter which houses such a transmitting mechanism in a planting transmission frame 20 that has a structure for transmitting motive power inputted into the planting part 15 to a planting drive shaft 92L or 92R and further transmitting the motive power from the planting drive shaft 92L or 92R to a planting arm shaft 93 for driving rotary planting units 21, this clutch consisting of a safety clutch S for disconnecting the motive power in abnormal circumstances of the rotary planting unit 21 is positioned at the front of the planting drive shaft 92L or 92R in an upstream direction of a speed reducer F in the transmitting mechanism, and a line-stopping clutch (unit clutch) W is preferably positioned on the planting arm shaft 93.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement of a safety clutch in a planting section of a rice transplanter.

[0002]

2. Description of the Related Art Conventionally, a rice transplanter in which a planting section provided with a rotary planting device is disposed at the rear of the machine so as to be able to move up and down is known. In many cases, connecting pipes are fixed to both sides of a planting case having planting claws, and a planting chain case is fixed to the connecting pipe. Then, in the case where the multi-row development is to be carried out from a four-row planting type to a six-row planting type or an eight-row planting type using the same structure, a further connecting pipe is fixed to the planting chain case, and a new connecting pipe is attached to the connecting pipe. The configuration was adopted in which the planting chain case was fixed. However, when the multi-row deployment is attempted with the above-described configuration, there has been a problem that the structure of the planting portion becomes complicated and the weight becomes heavy. Therefore, for the purpose of reducing the weight of the planting part, a connecting pipe is suspended in the lateral direction at the planting part, and the transmission pipe is fixed rearward through cruciform joints formed by bulging at the left and right ends of the connecting pipe. There has been proposed a rice transplanter in which a transmission mechanism of a planting portion is configured with a planting transmission frame of a portal type in plan view in which a power transmission mechanism is installed inside a connecting pipe and a transmission pipe. It is also known to provide a safety clutch on the transmission mechanism to cut off the transmission of power in order to prevent damage to the transmission mechanism of the planting section due to an abnormality in the drive transmission section of the rotary planting device or the like. I have.

[0003]

The connecting transmission pipe, the transmission pipe, and the cross pipe are used not only in the four-plant type planting section but also in the five-row planting type or the six-row planting type planting section. If a planting transmission frame can be constructed using a joint, a lightweight planting part can be constructed.In such a case, the position of the safety clutch of the rotary planting device having planting claws can be changed. If not sufficiently considered, a rotary planting device in which the safety clutch does not work will be configured, so that it is not possible to achieve the multi-row development from the four-row planting type. The present invention has been made in view of the above-described problem, and provides a configuration of a clutch of a planting portion that enables easy multi-row deployment.

[0004]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

[0005] That is, as set forth in claim 1, a transmission mechanism of the planting portion is provided in a planting transmission frame, and the power input to the planting portion is transmitted to the planting drive shaft. In the planting section of the rice transplanter that is configured to drive the planting claw through the planting arm shaft, a safety clutch that cuts off power transmission to the planting claw is provided on the transmission upstream side from the reduction section of the planting drive shaft. And provided on the planting drive shaft.

According to a second aspect of the present invention, the safety clutch is provided at a front portion of the planting drive shaft in the body traveling direction.

According to a third aspect of the present invention, a stop clutch is provided downstream of the safety clutch in the transmission, and a plurality of planting drive shafts are driven in the same direction.

[0008]

Next, embodiments of the present invention will be described. FIG. 1 is a side view showing an overall configuration of a rice transplanter according to the present invention, FIG. 2 is a plan view showing the same drive system, and FIG. 3 is a view showing a planting transmission frame of the rice transplanter according to the present invention. FIG. 4 is a plan view, and FIG. FIG. 5 is a plan sectional view showing the right front part of the planting transmission frame, and FIG.
7 is a plan sectional view showing a left front portion of the planting transmission frame, FIG. 7 is a diagram showing a safety clutch provided on the planting transmission shaft, and FIG. 8 is a plan view showing a rotary planting device at the rear of the planting transmission frame. It is sectional drawing. FIG. 9 is a plan view showing the unit clutch, FIG. 10 is a right side view thereof, and FIG.
FIG. 12 is a view showing a power transmission configuration of a planting section provided with a safety clutch and a unit clutch, and FIG. 12 is a view showing another embodiment of a power transmission configuration of the planting section.

First, the overall configuration of a rice transplanter according to the present invention will be described with reference to FIGS. In this embodiment, the rice transplanter is a riding rice transplanter. However, the present invention is not limited to this, and the present invention can be applied to a walking rice transplanter.

As shown in FIG. 1, the riding rice transplanter has a planting portion 15 disposed at a rear portion of a traveling portion 1 via an elevating link mechanism 27. The traveling portion 1 is provided with an engine 2 above a front portion of a body frame 3.
And a front lower part supports a front wheel 6 via a front axle case 5 and a rear part supports a rear wheel 8 via a rear axle case 7. The engine 2 is covered by a bonnet 9, spare seedling stands 30 are disposed on both sides of the bonnet 9, and a fuel tank 4 is provided above the bonnet 9, and a rear portion of the fuel tank 4 is provided. Is provided with a steering handle 14. The steering handle 1
An operation unit 11 provided with a main transmission lever, a sub transmission lever, an accelerator lever, an operation panel, and the like on the left and right sides of the lower part of the unit 4
Are concentrated. The body cover 12 that covers the body frame 3 of the traveling unit 1 forms a main step 10 from the rear of the hood 9 to the front of the seat 13, and the rear of the main step 10 rises high and the seat 13 is provided thereon. Have been. In front of the main step 10 and on both left and right sides of the bonnet 9, a front step 9a
Are formed integrally with the bonnet 9, and a clutch pedal 32, a brake pedal 33 and the like are arranged between the front step 9a and the main step 10.

The planting section 15 comprises a seedling table 16, planting claws 17, 17,..., A center float 34, a side float 35, and the like. The lower part of the seedling table 16 is supported by a lower guide rail 18 and the upper part of the front surface is slidably reciprocally slidable left and right by an upper guide rail 19. The lower guide rail 18 and the upper guide rail 19 It is supported by the frame 20 via a frame or the like. And the planting transmission frame 20
Then, the planting drive shafts 92L and 92R protrude rearward from the transmission shaft 91, and planting arm shafts 93 and 93 are provided at the rear of the planting drive shafts 92L and 92R in the left-right direction.
・ Rotating case 22 which rotates in one direction around 93
Are arranged on the left and right sides of the planting arm shafts 93, respectively, and the planting claws 17 are mounted on the rotating cases 22, 22 respectively.
17 are arranged two by two. Further, a hitch 24 is provided at a front portion of the planting transmission frame 20 via a rolling fulcrum shaft 23, and the hitch 24 is connected to a rear portion of the traveling portion 1 via a lifting link mechanism 27 including a top link 25 and a lower link 26. Then, an elevating cylinder 28 for driving the elevating link mechanism 27 to be moved up and down is connected to a lift arm 37 connected to the lower link 26 so that the planting section 15 can be moved up and down. At the same time as the front wheels 6.6 and the rear wheels 8.8 are driven and moved, the seedlings 17.1.
It is configured to take out and carry out continuous seedling planting work by 7.

The transmission case M extends from the lower front and rear central portion of the fuselage frame 3 to the rear lower portion of the rear end of the fuselage frame 3 and is formed to be long in the front-rear direction. . Further, a transmission section 51 is formed by mounting a traveling transmission mechanism in front of the transmission case M, and front axle cases 5.5 are fixed to left and right side surfaces of the transmission section 51. Axle cases 53 are fixed downward from the left and right ends, and front wheels 6.6 are provided at lower ends of the axle cases 53.
Is fixedly mounted. At the rear end of the transmission case M, there are formed cylindrical rear axle cases 7.7 each having an axial center in the left-right direction, and axles 56 are supported in the rear axle cases 7.7. 56
Rear wheels 8.8 are fixedly provided at the left and right end portions of 56, so that the conventional transmission case is eliminated. Therefore, the front and rear front axle cases 5.5 and the rear axle cases 7.7 are integrally formed on the same transmission case M, and the transmission case M is formed of a frame member that supports the wheels 6, 6, 8, and 8. Make up part.

The transmission unit 5 of the transmission case M
The input shaft 60 is protruded laterally from the first shaft 1, and power is transmitted to the pulley 61 fixed to the input shaft 60 via the belt 48, and the belt 48 for transmitting the power of the engine 2 and the transmission case M are formed. Arranged on a substantially straight line, each wheel
Power is transmitted to 8.8. Further, a PTO shaft 31 projects from a rear portion of the transmission case M, and the PTO shaft 3
1 is transmitted to the input bevel gear 49 also serving as the input shaft of the planting section 15 via the PTO transmission shaft 62 and the universal joint section 90. Since the universal joint portion 90 has a universal joint formed at the front and rear ends, the axis of the input bevel gear 49 also serving as the input shaft to the planting portion 15 is shifted to the right with respect to the PTO transmission shaft 62. Further, power can be transmitted even if the planting section 15 is moved up and down or in parallel by the lifting drive of the lifting link mechanism 27.

Next, the planting transmission frame 20 of the planting section 15
Will be described. As shown in FIGS. 3 and 4, in this embodiment, the planting portion 15 is a four-row planting type. Therefore, four sets of rotary planting devices 21, 21... Comprising a rotating case and two planting claws are provided. A total of eighteen planting claws 17.1
7 ... A transmission pipe 55 internally containing planting drive shafts 92L and 92R for transmitting power to a rotating case 22 having a mechanism for driving the planting claws 17 to rotate.
L.55R are provided one by one on the left and right. The front portions of the transmission pipes 55L and 55R are connected by connecting pipes 57 via cross joints 40 and 41, thereby forming a portal-type planting transmission frame 20 in plan view. The portal-type open side of the planting transmission frame 20 faces rearward, and rotary planting devices 21 are arranged on both left and right sides of the left and right open side ends. A transmission shaft or the like is supported inside the transmission pipes 55L and 55R and the connection pipe 57.

The transmission pipes 55L and 55R and the connection pipe 57 of the planting transmission frame 20 are formed as rod-shaped pipes, and the transmission pipes 55L and 55R and the connection pipe 57 are connected to the cross joint 40. It is connected by 41. The cross joints 40 and 41 are formed by horizontal pipes 40a and 41a and vertical pipes 40b and 41b by bulging. That is, the cross joints 40, 41 are connected to the front and rear ends of the transmission pipes 55L, 55R, and one side 40 (the right side in the present embodiment) of the cross joints 40, 41 arranged at the front is vertical. The pipe 40b is arranged in the front-rear direction, the front part of the transmission pipe 55R is inserted concentrically into the vertical pipe 40b, and one side of the connecting pipe 57 is inserted into the horizontal pipe 40a. Of the cross joints 41 on the other side (left side) of the cross joints 40 and 41 arranged at the front part, the connecting pipe 57 is coaxially inserted into the horizontal pipe 41a of the cross joint 41,
The front part of the left transmission pipe 55L is inserted into the vertical pipe 41b.

Further, cruciform joints 96 are also connected to the rear portions of the left and right transmission pipes 55L and 55R, respectively.
..The planting arm shafts 93 passing through the transmission pipe 5
The direction is changed via bevel gears 76 and 76 from bevel gears 70 and 70 fixed to the planting drive shafts 92R and 92L in the 5L and 55R, and power is transmitted to the planting arm shafts 93 and 93. Power is transmitted to rotary planting devices 21 arranged on both sides of the horizontal pipe of the cross joints 96. That is, the transmission pipes 55L and 55R
An input shaft for driving the rotary implanting devices 21, 21... Penetrates into the cross joints 96 arranged at the rear of the rotator, and transmits power to the rotating case 22, and the implanting claws 17, 17. It is driving. The bevel gears 70, 70 at the rear ends of the planting drive shafts 92R, 92L constitute a reduction portion F, and the number of teeth of the bevel gears 70, 70 and the bevel gears 76, 76 are adjusted so that the rotary planting device 21. 21 are configured to adjust the rotation speed of the planting arm shafts 93.

At the front of the planting transmission frame 20, there is provided a support for supporting the upper support frame 98 and the lateral feed mechanism of the seedling mounting table 16. A transverse feed shaft support arm 65 projects forward and upward from the right end of the connecting pipe 57, and a transverse feed conversion case support arm 64 is provided at the left end of the cross joint 41 fixed to the front of the left transmission pipe 55L. It projects parallel to the lateral feed shaft support arm 65, and furthermore, the connecting pipe 5
A cylindrical body 67 to which the rolling fulcrum shaft 23 is fitted is fixedly provided in front of the left and right central portions of the cylinder 7. The connecting pipe 57
An upper support frame 98 is attached to the cross joints 41 and 40 at both ends.
Are fixedly provided.

The upper support frame 98 passes through the front of the transverse feed shaft 47, which will be described later, and extends upward. The upper guide rail 19 is supported by using the upper portion of the upper support frame 98. The upper support frame 98 and the upper support frame 98 are integrally connected to each other to form a highly rigid frame that supports the planting section 15. Further, a lateral feed conversion case 46 is fixed to the outer side surface of the lateral feed conversion case support arm 64, and the lateral feed conversion case support arm 6 is provided.
The front end of the lateral feed shaft 47 and the front end of the lateral feed shaft support arm 65 are rotatably supported via bearings, and the left end of the lateral feed shaft 47 is inserted into the lateral feed conversion case 46.
A gear 134 that meshes with the fixed gear 133 is fixed to the left end of the transmission shaft 91 here. And the transverse feed shaft 47
Are arranged in parallel with the connecting pipe 57.

Next, the structure for transmitting power to the planting transmission frame 20 will be described. As described above, the transmission shaft and the like are supported inside the planting transmission frame 20. An input bevel gear 49 also serving as an input shaft to the planting portion 15 is rotatably supported in a cross joint 40 fixedly provided in front of the right transmission pipe 55R, and the left and right transmission pipes 55L and 55R respectively. The planting drive shafts 92L, 92R penetrate, and the bevel gears 75, 50 at the front ends of the planting drive shafts 92L, 92R are rotatably supported in the cross joints 41, 40 via bearings. A transmission shaft 91 penetrates into the connecting pipe 57, and bevel gears 74 fixed on both right and left ends of the transmission shaft 91.
・ Cross joint 4 fixed at both left and right ends of connecting pipe 57
It is rotatably supported in bearings 1 and 40 via bearings. In addition, planting arm shafts 93, 93 penetrate in the left-right direction into the cross joints 96, 96 at the rear portions of the left and right transmission pipes 55L, 55R.

The input bevel gear 49 is connected to the PTO through a universal joint 90 and a PTO transmission shaft 62.
One end of the shaft 31 is connected to transmit the power of the PTO shaft 31 described above. Then, the transmission shaft 9 is connected to the input bevel gear 49.
A bevel gear 72 fixed at one end is meshed with the transmission shaft 9.
1 is driving. Further, a bevel gear 50 is fixed at a front portion of the planting drive shaft 92R, and is meshed with a bevel gear 72 fixed at the right end of the transmission shaft 91 of the connecting pipe 57 to transmit power to the planting drive shaft 92R. .

A bevel gear 74 is also fixedly provided at the left end of the transmission shaft 91, and meshes with a bevel gear 75 which is fixed to the front of the planting drive shaft 92L in the left transmission pipe 55L.
Power is transmitted from the transmission shaft 91 to the planting drive shaft 92L.
The left end of the transmission shaft 91 in the connecting pipe 57 projects laterally from the cross joint 41, and
6, a gear 133 is fixed to the left end of the transmission shaft 91. A gear 134 is also fixedly provided on the left end of the traverse shaft 47 inserted into the traverse conversion case 46.
4 and the gear 133 mesh with each other to form a seedling table drive mechanism for transmitting power to the lateral feed shaft 47. A groove 47a for sliding the slider is formed in the lateral feed shaft 47, and a slider receiver 137 is loosely fitted on the outer peripheral surface of the lateral feed shaft 47,
A slider 138 provided in the slider receiver 137 is fitted into the groove 47a, and the slider 138 slides in the groove 47a with the rotation of the traverse shaft 47. It reciprocates right and left on the feed shaft 47. Slider receiver 13
The seedling mounting table 16 is connected to the rear portion via a connecting portion (not shown). The rotation of the lateral feed shaft 47 causes the seedling mounting table 16 to reciprocate right and left.

As described above, the left and right planting drive shafts 92L and 92L
The power transmitted to R is transmitted to left and right transmission pipes 55L and 55L.
A bevel gear 70 fixed to the rear end of the planting drive shafts 92L, 92R in the cross joints 96 fixed to the rear of the R.
Power is transmitted to the planting arm shafts 93 via the bevel gears 76 and the bevel gears meshing therewith, and the rotary planting devices 21. 21.
.. Are driven and the planting claws 17 are rotated to plant seedlings.

Here, the safety clutch S according to the present invention will be described. As shown in FIGS. 4 to 6, the same safety clutch S is provided on each of the left and right planting drive shafts 92L and 92R. Therefore, here, one of the safety clutches S will be described in detail. The safety clutch S according to the present embodiment is configured such that when the rotary planting devices 21 are driven by the power input to the planting transmission frame 20 and transmitted to the planting drive shafts 92L and 92R,
When an abnormal load is applied to the planting drive shafts 92L and 92R, transmission of power to the planting drive shafts 92L and 92R is automatically cut off.

The safety clutch S is provided so that a part thereof penetrates into the front and left cross joints 40 and 41 of the planting transmission frame 20. The safety clutch S includes a fixed clutch pawl 39, a spring 44 for biasing the sliding clutch pawl 43, and the like. The conventional clutch includes a plurality of clutch pawls, a snap ring, a collar, and the like. The number of parts has been greatly reduced compared to the safety clutch.

In the present embodiment, the safety clutch S is provided at the front end of the planting drive shafts 92L and 92R, but is not limited to the position shown in this embodiment, It does not matter if it is in front of 92L / 92R. By providing the safety clutch S at the front of the planting drive shafts 92L and 92R, the planting unit 1 which tends to be biased toward the rear by the rotary planting device 21 which is a heavy object located at the rear of the planting unit 15 is used.
Since the center of gravity of 5 is moved to the center, the balance before and after the planting portion 15 is stabilized. Further, since the safety clutch S is disposed upstream of the speed reduction unit F in the transmission system, the operating torque of the safety clutch can be suppressed low, and the size and capacity are reduced, resulting in a compact configuration. It is.

As shown in FIG. 5 and FIG.
At the front end of the R (92L), a mounting portion 92a for fitting a bevel gear or the like is extended to form a spline on the outer periphery, and the sliding-side clutch pawl 43 is slidable on the mounting portion 92a in the front-rear direction. To the planting drive shaft 92R
(92L) and the sliding-side clutch pawl 43 rotate integrally and synchronously. And, similarly, the planting drive shaft 92R (9
The spring retainer 45 is fitted on the outer periphery of the 2L) mounting portion 92a and behind the sliding clutch pawl 43. A spring 44 is fitted to the planting drive shaft 92R (92L) between the spring retainer 45 and the sliding clutch pawl 43.
The sliding-side clutch pawl 43 is urged forward (occlusally). The fixed-side clutch pawl 39 is attached to the tip of the mounting portion 92a.
Is loosely fitted, a spline is formed on the boss at the tip of the fixed-side clutch claw 39, and the bevel gear 50 (75) is spline-fitted, and these rotate integrally. On the outer periphery of the shaft portion of the fixed-side clutch pawl 39, the fixed-side clutch pawl 39 is
It is rotatably supported by 5R. The safety clutch S is assembled by attaching the spring holder 45 and the spring 4 to the mounting portion 92a.
4. Insert the sliding-side clutch pawl 43 and the fixed-side clutch pawl 39, and attach the pin 37 to the tip of the planting drive shafts 92L and 92R.
And the bearing 42 on the fixed side clutch claw 39,
The bevel gear 50 is externally fitted. When the assembly is completed, the pin 37 and the bevel gear 50 partially overlap in a plan view, so that the bevel gear 50 is prevented from coming off the pin 37.

The fixed-side clutch pawls 39 and the sliding-side clutch pawls 43 are engaged with each other, so that the input drive shaft 9 is driven from the input bevel gear 49 via a bevel gear 72 fixed to the end of the transmission shaft 91.
The 2R bevel gear 50 rotates and power is transmitted to the planting drive shaft 92R. Alternatively, a fixed bevel gear 72 rotates at the end of the transmission shaft 91 meshing with the input bevel gear 49, and a bevel gear 75 at the front end of the planting drive shaft 92L meshing with the bevel gear 74 fixed at the other end of the transmission shaft 91. By rotating, power is transmitted to the planting drive shaft 92L. When an abnormal load is applied to the planting drive shafts 92L and 92R, the safety clutch SS is turned off and the planting drive shafts 92L and 92R are turned off.
Power is not transmitted to L · 92R. That is, an abnormality occurs in the rotary planting device 21 and the planting drive shaft 9
When the 2L / 92R does not rotate normally, the spring 4
The sliding-side clutch pawl 43 moves on the mounting portion 92a of the planting drive shafts 92L and 92R in the direction (rearward) of the contraction of 4, so that the fixed-side clutch pawl 39 and the sliding-side clutch pawl 43 do not mesh with each other. It is. Therefore, the rotary planting device 21
21. If an abnormality occurs in the planting drive shaft 9 automatically
It is possible to prevent the transmission of power to the 2L / 92R from being interrupted, and to prevent the rotary planting devices 21 from being damaged.

Next, the stop clutch (hereinafter referred to as a unit clutch) W will be described. The unit clutches WW are provided on the planting arm shafts 93 behind the safety clutch SS in the planting transmission frame 20 (downstream of the transmission). In this embodiment, the unit clutch W
W is from the planting drive shafts 92L and 92R to the planting claws 17
The power is connected to and disconnected from the planting arm shafts 93 for driving the shafts. Like the safety clutch SS, the same shape is provided below the left and right planting transmission shafts 92L and 92R. Therefore, the right side will be described in detail here. As shown in FIGS. 8 to 10, the sliding-side clutch pawl 71 is slidably fitted to the planting arm shaft 93 in a slidable manner, and the planting arm shaft 93 and the sliding-side clutch pawl 71 are integrally formed. Rotate and move. The fixed-side clutch pawl 76 meshing with the sliding-side clutch pawl 71 is similarly loosely fitted to the planting arm shaft 93 so as to be relatively rotatable. The fixed-side clutch pawl 76 has a bevel gear 76b fixedly mounted on the outer periphery of a shaft 76a thereof. The fixed-side clutch pawl 76 rotates about the planting arm shaft 93.

The clutch arm 73 includes a transmission pipe 55R.
(55L) and is pivotally supported by a rotating shaft 73a penetrating a bracket 110 having a U-shaped cross section shown in FIG.
As shown in FIGS. 9 and 10, the clutch arm 73 is L-shaped, and is connected to the wire 52 at one end (the front in this embodiment) via a spring 52a. The clutch arm 73 can be operated, and the other end of the wire 52 is connected to a unit clutch lever disposed on the upper back surface of the seedling mounting table 16. On the other hand, the other end (the rear in the present embodiment) of the clutch arm 73 is formed in a U-shape in plan view, and is rotatable with a stop pin sandwiching a pin 109 inserted into the cross joint 96. It is supported.

Accordingly, by operating the wire 52 and rotating the clutch arm 73, the pin 1 is inserted into the cross joint 96.
09 (K · H). Cross joint 9
The distal end of the pin 109 inserted into the contact 6 comes into contact with a cam portion 71 a formed on the sliding clutch pawl 71, and the sliding clutch pawl 71 is separated from the fixed clutch pawl 76 by pushing the pin 109. , The unit clutch W is in the OFF state (K). As described above, when the engagement between the fixed-side clutch pawl 76 and the sliding-side clutch pawl 71 is released, power is not transmitted to the planting arm shaft 93, and accordingly, the rotating case inputted by the planting arm shaft 93 is not used. 22 are not driven, the planting claws 17 provided on the rotating case 22 are not driven, and the two strips do not work. The sliding-side clutch pawl 71 is configured so that the unit clutch W is turned ON by a spring 113. The clutch arm 73 is connected to a spring 52a attached to a wire 52 for operating the clutch arm 73. ,
The unit clutch W is biased to the ON state (H).

The planting drive shafts 92L and 92R and the planting arm shafts 93 and 93 to which the power is transmitted from the planting drive shafts 92L and 92R are connected to the four-row planting plant 15 shown in the present embodiment. Are provided, each of which is configured to rotate in the same direction. That is, the cross joint 4 arranged in front of the planting transmission frame 20
The rear end of the bevel gears 75 and 50 at the front end of the planting drive shafts 92L and 92R in 0.41 has the same configuration. Then, as shown in FIG.
The transmission pipes 55L and 55R, the planting drive shafts 92L and 92R, and the rotary planting devices 21.21.
Then, the safety clutch SS is provided on the planting drive shafts 92L and 92R, and the unit clutches WW are provided on the planting arm shafts 93 located behind the planting drive shafts 92L and 92R. Since these clutches are also included in the respective planting units PP, when the planting section 15 is developed from a four-row planting type to a six-row planting type, the transmission shaft 91 in the connecting pipe 57 is used. Can be extended to the left side and a planting unit having the same shape as the planting unit P can be attached, which is convenient in achieving multi-row deployment.

Further, the above-described unit clutch may be configured as follows. As shown in FIG. 12, the unit clutch Q is provided on a transmission shaft 91 laid on the left and right at the front of the planted transmission frame 20. The unit clutches Q, Q having the same configuration are provided on the left and right sides of the transmission shaft 91, respectively. The bevel gears 74 on the transmission shaft 91 that mesh with the bevel gears 75, 50 at the front ends of the planting drive shafts 92L, 92R.
・ 72 is slid left and right, and the planting drive shafts 92L ・ 92R
The engagement with the front end bevel gears 75 and 50 is configured to be disconnected. The two sets of unit clutches Q and Q provided in the four-row planting section have the same configuration, and therefore the configuration of one of the unit clutches Q and Q (left side in FIG. 12) will be described.

The unit clutch Q has a bevel gear 7
4 (72), a cam 105 is slidably spline-fitted to the shaft portion, the cam 105 is provided with a sliding clutch pawl 106b, and a spring is provided between the other side of the cam 105 and the bevel gear 74 (72). It is urged in the claw engagement direction via 103. Accordingly, the bevel gear 74 (72) and the sliding-side clutch pawl 10
6b also rotates together. The fixed-side clutch pawl 106a meshing with the sliding-side clutch pawl 106b is fixed to the transmission shaft 91.
1 and rotate synchronously. When the unit clutch Q is in the ON state, the fixed-side clutch pawl 106a and the sliding-side clutch pawl 106b mesh with each other to transmit the power of the transmission shaft 91 to the planting drive shaft 92L (92R). When the unit clutch Q is turned off with an operating tool such as a wire, the sliding side clutch claw 10
6b is moved to disengage the sliding-side clutch pawl 106b from the fixed-side clutch pawl 106a.
Power is not transmitted to L (92R).

As described above, by disposing the unit clutch Q in front of the planted transmission frame 20, the connecting path of the unit clutch Q to the operating tool is shortened, so that the unit clutch Q can be simply constructed. When the unit clutches Q and Q are provided at the positions shown in FIG. 12, the unit clutches Q and Q are input to the right and left planting drive shafts 92L and 92R, respectively.
・ Because Q is provided, the power from the PTO shaft 31
The input position to the transmission shaft 91 from the input bevel gear 49 input to the planting portion 15 via the O transmission shaft 62 and the universal joint portion 90 is substantially at the center of the transmission shaft 91.

[0035]

The present invention is configured as described above.
The following effects are obtained.

That is, as set forth in claim 1, the transmission mechanism of the planting portion is provided in the planting transmission frame, and the power input to the planting portion is transmitted to the planting drive shaft. In the planting section of the rice transplanter that is configured to drive the planting claw through the planting arm shaft, a safety clutch that cuts off power transmission to the planting claw is provided on the transmission upstream side from the reduction section of the planting drive shaft. Since it is provided on the planting drive shaft, the operating torque of the safety clutch can be suppressed low, so that the capacity of the safety clutch can be reduced, and the size of the safety clutch can be reduced. This can contribute to downsizing of the attachment portion.

According to a second aspect of the present invention, since the safety clutch is provided at the front of the planting drive shaft in the machine body traveling direction, the relatively heavy safety clutch located at the front of the planting section and the planting are provided. The planting device, which is a heavy object disposed at the rear of the section, improves the balance of the entire planting section.

According to a third aspect of the present invention, a stop clutch is provided on the transmission downstream side of the safety clutch, and a plurality of planting drive shafts are configured to be driven in the same direction. With the mechanism up to the nail as a single planting unit, the same planting unit can be used in planting sections of different types of streaks, and from quadruple-planting rice transplanters to six-row planting, eight-row planting, etc. This makes it possible to use common parts when developing the stripes, thereby reducing costs.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a rice transplanter according to the present invention.

FIG. 2 is a plan view showing a drive system.

FIG. 3 is a plan view of the planting transmission frame of the rice transplanter according to the present invention.

FIG. 4 is a plan sectional view of the same.

FIG. 5 is a plan sectional view showing a right front portion of the planting transmission frame.

FIG. 6 is a plan sectional view showing a left front part of the planting transmission frame.

FIG. 7 is a view showing a safety clutch provided on the planting transmission shaft.

FIG. 8 is a plan sectional view showing a rotary planting device at the rear of the planting transmission frame.

FIG. 9 is a plan view showing a unit clutch.

FIG. 10 is a right side view of the same.

FIG. 11 is a diagram showing a power transmission configuration of a planting section provided with a safety clutch and a unit clutch.

FIG. 12 is a view showing another embodiment of the power transmission configuration of the planting section.

[Explanation of symbols]

 F Deceleration part S Safety clutch W Stripping clutch (unit clutch) 15 Planting part 17 Planting claw 20 Planting transmission frame 21 Rotary planting device 91 Transmission shaft 92L / 92R Planting drive shaft 93 Planting arm shaft

Claims (3)

[Claims] 1. A power transmitting mechanism for a planting portion is provided in a planting transmission frame, and power input to the planting portion is transmitted to a planting drive shaft, and the planting drive shaft transmits the power through a planting arm shaft. In the planting section of the rice transplanter configured to drive the planting claw, a safety clutch that cuts off power transmission to the planting claw is provided on the planting drive shaft on the transmission upstream side of the reduction section of the planting drive shaft. A clutch at a planting section of a rice transplanter, which is provided in a rice planter. 2. The planting portion clutch of a rice transplanter according to claim 1, wherein the safety clutch is provided at a front portion of the planting drive shaft in the machine body traveling direction. 3. The device according to claim 1, further comprising a stop clutch provided downstream of the safety clutch in the transmission, and a plurality of planting drive shafts being driven in the same direction. Item 4. A clutch at a planting portion of a rice transplanter according to item 2.