JP7044693B2 - Paddy field work machine - Google Patents

Description

The present invention relates to a configuration for raising and lowering a working device in a paddy field working machine such as a riding type rice transplanter and a riding type direct seeding machine.

In a passenger-type rice transplanter, which is an example of a paddy rice transplanter, as disclosed in Patent Document 1, a seedling planting device is supported by the machine body so as to be able to move up and down, and a hydraulic cylinder for raising and lowering the seedling planting device. Some are equipped with a mechanically operated type control valve that supplies and discharges hydraulic oil to the hydraulic cylinder, and an artificially operated elevating operation lever.

By operating the control valve to the ascending operating position, the neutral stop position, and the descending operating position by the elevating operation lever, the hydraulic linder is operated and the seedling planting device is elevated.

In Patent Document 1, the seedling planting device is provided with a float that is supported up and down so as to follow the ground surface, and a wire is connected to the control valve and the float. The control valve is automatically operated by the float and the wire so that the height of the seedling planting device with respect to the float is mechanically transmitted to the control valve via the wire and the seedling planting device is maintained at the set height from the field surface. Is operated.
By maintaining the seedling planting device at the set height from the field surface, the seedling planting depth by the seedling planting device is maintained at the set planting depth.

Japanese Unexamined Patent Publication No. 2008-237062

In Patent Document 1, when the operator operates the elevating operation lever, the elevating operation lever operates the control valve to the neutral stop position, the ascending operation position, and the descending operation position. In this case, since the operation stroke of the elevating operation lever is large, there is room for improvement in terms of operability.

An object of the present invention is to improve the operability of a control valve in a paddy field work machine in which a work device is supported so as to be able to move up and down and a control valve for raising and lowering the work device and a float of the work device are mechanically linked. It is supposed to be.

The paddy field working machine of the present invention operates a working device supported by the machine body so as to be able to move up and down, a hydraulic cylinder for raising and lowering the working device, and a hydraulic cylinder by supplying and discharging hydraulic oil to the hydraulic cylinder to operate the hydraulic cylinder. A control valve, a float that is supported by the work device so as to be able to move up and down and follow the ground surface, and a float that is provided over the control valve and the float, and the height of the work device with respect to the float is mechanically applied to the control valve. A lifting actuator that can operate the control valve and an artificially operable operation are provided, which is equipped with a lifting / lowering linkage mechanism that keeps the working device at a set height from the field surface by operating the control valve. An elevating control unit for operating the elevating actuator based on the operation of the operating tool is provided, and the elevating actuator and the elevating linkage mechanism can operate the control valve separately from each other. When the operating tool is operated to the first ascending position, the elevating control unit operates the control valve to the ascending operating position in preference to the elevating and lowering linkage mechanism without going through the elevating and lowering linkage mechanism. Is operated to the neutral position, the elevating actuator is operated so that the control valve is operated to the neutral stop position in preference to the elevating and lowering linkage mechanism without going through the elevating and lowering linkage mechanism. When operated to the second ascending position, the elevating actuator is operated so that the control valve is operated and maintained at the ascending operating position in preference to the elevating and lowering linkage mechanism without going through the elevating and lowering linkage mechanism.

According to the present invention, in a state where the float follows the ground surface of the ground, the height of the working device with respect to the float is mechanically transmitted to the control valve by the elevating linkage mechanism, the control valve is operated, and the working device is set from the field surface. Maintained at height.

According to the present invention, when the operating tool is operated to the second ascending position, the control valve is operated to the ascending operating position in preference to the elevating linkage mechanism based on the operation of the elevating actuator, and the working device is operated ascending. Will be done.
Even if the operating tool is not maintained in the second ascending position after being operated in the second ascending position, the control valve is maintained in the ascending operating position based on the operation of the elevating actuator, so that the ascending operation of the working device continues. Will be done.

According to the present invention, when the operating tool is operated to the first ascending position, the control valve is operated to the ascending operating position in preference to the elevating linkage mechanism based on the operation of the elevating actuator, and the working device is ascended. When the operating tool is operated to the neutral position, the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism based on the operation of the elevating actuator, and the ascending operation of the work device is stopped. Will be done.
This makes it possible to raise the work device slightly and stop it, and to raise the work device to an arbitrary height and stop it so that maintenance work of the work device can be easily performed. Become.

According to the present invention, the control valve is operated to the ascending operation position based on the operation of the elevating actuator by the operation of the operating tool.
As a result, even if the operation stroke of the operation tool is set to a small one, the control valve is operated reasonably based on the operation of the elevating actuator, and the operation resistance of the control valve is not applied to the operation tool. The operability of the valve is improved.
According to the present invention, it is possible to raise the working device to an arbitrary height and stop it, the maintenance work of the working device can be easily performed, and the maintainability of the working device is improved.

In the present invention, in the elevating control unit, when the actuator is operated to the first descending position, the control valve is operated by the elevating linkage mechanism, and the actuator is operated to the neutral position. When the elevating actuator is operated and the operating tool is operated to the second descending position so that the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism without going through the elevating linkage mechanism. It is preferable to operate the elevating actuator so that the control valve is maintained in a state of being operated by the elevating linkage mechanism.

According to the present invention, when the operating tool is operated to the second lowering position, a state in which the control valve is operated by the elevating linkage mechanism is set based on the operation of the elevating actuator.
When the work device is raised from the field surface, the float is lowered with respect to the work device. Therefore, when the control valve is operated by the elevating and lowering linkage mechanism, the control valve is operated to the lowering operation position by the elevating and lowering linkage mechanism. , The working equipment is lowered.
Even if the operating tool is not maintained in the second descending position after being operated in the second descending position, the control valve is maintained in the state of being operated by the elevating linkage mechanism based on the operation of the elevating actuator. The descent operation of is continued.

When the work equipment descends and the float touches the ground surface, the float rises with respect to the work equipment. The lowering operation of the working device is stopped.
After that, the height of the working device with respect to the float is mechanically transmitted to the control valve by the elevating and lowering linkage mechanism, the control valve is operated, and the working device is maintained at the set height from the field surface.

When the operating tool is operated to the first lowering position, the state in which the control valve is operated by the elevating linkage mechanism is set based on the operation of the elevating actuator, and the working device is lowered. Is operated to the neutral position, the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism based on the operation of the elevating actuator, and the descent operation of the working device is stopped.
This makes it possible to lower the work device slightly to stop it, and to lower the work device to an arbitrary height to stop it, making it easier to perform maintenance work on the work device. Become.

According to the present invention, the control valve is operated to the ascending operating position and the descending operating position based on the operation of the elevating actuator by the operation of the operating tool.
As a result, even if the operation stroke of the operation tool is set to a small one, the control valve is operated reasonably based on the operation of the elevating actuator, and the operation resistance of the control valve is not applied to the operation tool. The operability of the valve is improved.
According to the present invention, the work device can be lowered to an arbitrary height and stopped, the maintenance work of the work device can be easily performed, and the maintainability of the work device is improved.

In the present invention, the upper limit position detection unit for detecting that the work device has risen is provided at the upper limit position of the elevating range of the work device, and the elevating control unit is such that the work device is in the upper limit position by the upper limit position detection unit. It is preferable to operate the elevating actuator so that the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism without going through the elevating linkage mechanism. ..

According to the present invention, when the control valve is maintained in the ascending operating position based on the operation of the elevating actuator and the working device is operated ascending, when the working device reaches the upper limit position, based on the operation of the elevating actuator, The control valve is operated to the neutral stop position in preference to the elevating linkage mechanism.
As a result, even if the operator does not operate the operating tool, the working device can be stopped reasonably at the upper limit position, and the operability of the control valve by the operating tool is improved.

In the present invention, the lower limit position detection unit for detecting that the work device has descended is provided at the lower limit position of the elevating range of the work device, and the elevating control unit is such that the work device is in the lower limit position by the lower limit position detection unit. It is preferable to operate the elevating actuator so that the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism without going through the elevating linkage mechanism. ..

According to the present invention, when the working device reaches the lower limit position while the control valve is maintained in a state where the control valve is operated by the elevating linkage mechanism based on the operation of the elevating actuator, for example, on the road, the elevating actuator is activated. Based on this, the control valve is operated to the neutral stop position in preference to the elevating and lowering linkage mechanism.
As a result, even if the operator does not operate the operating tool, the working device is reasonably stopped at the lower limit position, and the operability of the control valve by the operating tool is improved.

In the present invention, the elevating control unit is such that when the engine is stopped, the control valve is operated to the neutral stop position in preference to the elevating / lowering linkage mechanism without going through the elevating / lowering linkage mechanism. It is preferable to operate the elevating actuator.

When the engine is stopped, the hydraulic pump that supplies hydraulic oil to the control valve and the hydraulic cylinder is also stopped.
In this state, according to the present invention, when the engine is stopped, the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism based on the operation of the elevating actuator, so that the working device is operated by its own weight. There is no such thing as a descent.
In the present invention, the operation unit operated by the elevating actuator and the operation unit operated by the elevating linkage mechanism are arranged so as to face the end of the spool of the control valve, and the elevating actuator is used. It is preferable that the operation unit to be operated and the operation unit operated by the elevating / lowering linkage mechanism can operate the spool of the control valve separately from each other.

It is a left side view of a passenger-type rice transplanter. It is a cross-sectional plan view of a seedling planting device. It is a left side view near the float. It is a right side view in the vicinity of a lift motor, a control valve, and a first work linkage mechanism. It is a right side view in the vicinity of a control valve and an operation shaft. It is an exploded perspective view of a control valve, an operation shaft, an operation arm, a wire and the like. It is a front view in the vicinity of a control valve, an operation shaft and an operation arm. It is a right side view in the vicinity of a control valve, a planting clutch operated to a shutoff position, a fertilizer application clutch, and the first and second work linkage mechanisms. It is a right side view which shows the state which the planting clutch and the fertilizer application clutch are operated to the transmission position from the state shown in FIG. It is a right side view near the swing part, the accommodation part and the length adjustment part in the 1st work linkage mechanism. It is a cross-sectional plan view near the swing part, the accommodation part and the length adjustment part in the 1st work linkage mechanism. It is a right side view of the vicinity of a planting clutch and a fertilizer application clutch. It is a cross-sectional plan view near the planting clutch and the fertilizer application clutch. It is a vertical sectional rear view in the vicinity of the 1st operation member and the linking member of a planting clutch. It is an exploded perspective view of the 1st operation member and the linking member of a planting clutch. It is a left side view near the marker motor. It is an exploded plan view near the marker motor. It is an exploded perspective view near the marker motor. It is a schematic diagram which shows the linkage state of a control device and each part. It is a schematic diagram which shows the linkage state of a control device and each part. It is a top view which shows the turning state at the ridge. It is a figure which shows the flow of control based on the operation position of the operation lever. It is a figure which shows the flow of control based on the operation position of the operation lever. It is a figure which shows the flow of control based on the operation position of the operation lever. It is a right side view in the vicinity of the 1st and 2nd swinging portions, and the accommodation portions in the 1st work linkage mechanism in the 1st alternative embodiment of the invention. It is a right side view which shows the state which the planting clutch and the fertilizer application clutch are operated to the transmission position from the state shown in FIG. 25 in the 1st alternative embodiment of the invention. FIG. 3 is a cross-sectional plan view of the vicinity of the first and second swinging portions and the accommodation portion in the first work linking mechanism in the first alternative embodiment of the invention.

1 to 27 show a passenger-type rice transplanter, which is an example of a paddy field working machine, where F indicates a forward direction, B indicates a backward direction, U indicates an upward direction, and D indicates a downward direction. Indicated, R indicates the right direction, and L indicates the left direction.

(Overall configuration of passenger rice transplanter)
As shown in FIG. 1, in a passenger-type rice transplanter, a link mechanism 4 is swingably supported up and down at the rear of an airframe 3 provided with right and left front wheels 1 and right and left rear wheels 2. A hydraulic cylinder 5 that extends to the side and raises and lowers the link mechanism 4 is provided.

A seedling planting device 6 (corresponding to a working device) is supported at the rear of the link mechanism 4. A fertilizer application device 7 for supplying fertilizer to the rice field surface G is provided over the rear part of the machine body 3 and the seedling planting device 6, and a ground leveling device 50 for leveling the rice field surface G is provided at the lower part on the front side of the seedling planting device 6. It is supported.

In the airframe 3, right and left airframes 60 are provided along the front-rear direction, a mission case 73 is connected to the front part of the airframe 60, and an engine 34 is supported by the front part of the mission case 73. ..

(Overall configuration of seedling planting equipment)
As shown in FIGS. 1 and 2, the seedling planting device 6 is provided with a support frame 8, a feed case 14, a planting transmission case 9, a rotary case 10, a planting arm 11, a float 12, a seedling stand 13, and the like. Has been done.

The support frame 8 is manufactured by an aluminum drawing method and has a trapezoidal cross-sectional shape (see FIG. 3). The support frame 8 is arranged along the left-right direction, the feed case 14 is connected to the left and right center portions of the support frame 8, and the two planting transmission cases 9 are connected to the right portion and the left portion of the support frame 8. It is extended to the rear side.

The rotary case 10 is rotatably supported on the right and left portions of the rear portion of the planting transmission case 9, and the planting arms 11 are supported on both ends of the rotary case 10. The seedling stand 13 is supported so as to be able to reciprocate in the left-right direction.

The power of the engine 34 is transmitted from the planting clutch 21 (see FIGS. 8 and 19) inside the transmission case 73 to the transmission mechanism (not shown) inside the feed case 14 via the transmission shaft 35. A lateral feed shaft (not shown) provided in the feed case 14 drives the seedling pedestal 13 to reciprocate laterally feed in the left-right direction with a predetermined stroke.

The power transmitted to the transmission mechanism of the feed case 14 is transmitted to the rotary case 10 via the transmission shaft 36, the torque limiter 37 inside the planting transmission case 9, the transmission chain 38, and the minority clutch 39. As the seedling stand 13 is driven to reciprocate and laterally feed in the left-right direction, the rotary case 10 is rotationally driven, and the planting arm 11 alternately takes out the seedlings from the lower part of the seedling stand 13 and plants them on the rice field G.

Right and left markers 23 are vertically and vertically supported around the axis P1 along the front-rear direction of the right end portion and the left end portion of the support frame 8. The marker 23 is provided with an arm portion 23a rotatably supported by the support frame 8 around the axis P1 and a rotating body 23b rotatably supported by the tip portion of the arm portion 23a.

As shown in FIG. 19, the marker 23 can be moved up and down from the work position B1 that is in contact with the field surface G to form an index of the work process on the field surface G and the storage position B2 on the upper side from the field surface G. As the machine body 3 advances in a state where the rotating body 23b of the marker 23 operated to the working position B1 is in contact with the field surface G, the rotating body 23b of the marker 23 rotates and forms an index on the field surface G.

(Overall configuration of fertilizer application device)
As shown in FIGS. 1 and 2, the fertilizer application device 7 is provided with a hopper 15, a feeding portion 16, a blower 17, a groove making device 18, a hose 19, and the like.

In the machine body 3, a hopper 15 for storing fertilizer and a feeding portion 16 are supported on the rear side of the driver's seat 20, and a blower 17 is provided on the left lateral side of the feeding portion 16. A grooving device 18 is attached to the float 12, four grooving devices 18 are provided, and four hoses 19 are connected to the feeding portion 16 and the grooving device 18.

The power of the engine 34 is transmitted to the transmission arm 81 via the fertilizer application clutch 22 (see FIGS. 8 and 19) inside the mission case 73. The transmission arm 81 extends to the left outside through the left airframe frame 60, and is rotationally driven around the axis in the left-right direction. The transmission rod 82 is connected to the transmission arm 81 and the feeding portion 16, and the transmission rod 82 is arranged linearly in a side view.

The power of the engine 34 is transmitted to the transmission rod 82 via the fertilizer application clutch 22 and the transmission arm 81, the transmission rod 82 is pushed and pulled along the front-rear direction, and the feeding portion 16 is driven.

The fertilizer of the hopper 15 is fed by the feeding portion 16 and supplied to the groove making device 18 through the hose 19 by the transport air of the blower 17. Fertilizer is supplied from the grooving device 18 to the groove of the field surface G while the groove is formed on the field surface G by the grooving device 18.

(Overall configuration of leveling equipment)
As shown in FIGS. 1 and 2, in the lower part of the front part of the seedling planting device 6, a ground leveling device 50 for leveling the rice field surface G is supported on the front side of the support frame 8.

The right and left support members 45 are connected to the left end portion and the right end portion of the support frame 8. Around the same axis P6 as the transmission shaft 36, the transmission case 46 is supported by the left support member 45 so as to be swingable up and down, and the support arm 47 is supported by the right support member 45 so as to be swingable up and down. There is.

A drive shaft 48 is rotatably supported over the front portion of the transmission case 46 and the support arm 47, and a large number of leveling bodies 53 are attached to the drive shaft 48. The power of the transmission shaft 36 is transmitted from the transmission shaft 49 erected over the planted transmission case 9 and the transmission case 46 to the drive shaft 48 via the torque limiter 51 and the transmission chain 52 inside the transmission case 46. Will be done.

The drive shaft 48 and the ground leveling body 53 are rotationally driven in the counterclockwise direction of FIG. 1 by the power of the transmission shaft 36, and the ground leveling body 53 performs leveling of the field surface G. As shown in FIGS. 2 and 3, the support member 45 is extended to the front side, and the cover 54 is attached over the extended portion of the support member 45. The mud that is bounced to the rear side by the leveling body 53 is stopped by the cover 54, and the accumulation of mud on the float 12 is prevented.

(Structure related to control valve and elevating motor for elevating operation of seedling planting device)
As shown in FIGS. 4 to 7 and 19, a control valve 24 for supplying / discharging hydraulic oil to the hydraulic cylinder 5 is provided in the rear part of the machine body 3 on the lower side of the driver's seat 20. The control valve 24 supplies hydraulic oil to the hydraulic cylinder 5 to raise the hydraulic cylinder 5 (contraction operation), discharges hydraulic oil from the hydraulic cylinder 5 to lower the hydraulic cylinder 5 (extension operation). It can be operated to the lowering operation position to stop the hydraulic cylinder 5 and the neutral stop position to stop the hydraulic cylinder 5.

A spool 24a that can be slidably operated in the front-rear direction (horizontal direction in FIGS. 4 and 5) is provided in the control valve 24 in the forward direction. The spool 24a of the control valve 24 can slide to the ascending operation position on the side close to the control valve 24 on one side and the descending operation position on the side far from the control valve 24 on the other side with the neutral stop position in between. It is urged to the lowering operation position by a spring (not shown) provided inside the control valve 24.

Brackets 25 and 26 are connected to the front portion of the control valve 24, and the operation shaft 55 is rotatably supported around the axis P7 in the left-right direction of the brackets 25 and 26. A fan-shaped operation gear 55a is connected to the right end of the operation shaft 55, a shaft-shaped operation portion 55b is connected to the operation gear 55a, and the operation portion 55b extends to the end of the spool 24a of the control valve 24. It has been issued.

The elevating motor 56 (corresponding to the elevating actuator) and the deceleration mechanism 57 are connected to the bracket 26, and the pinion gear 57a of the deceleration mechanism 57 meshes with the operation gear 55a of the operation shaft 55. The elevating motor 56 drives the pinion gear 57a of the reduction mechanism 57 to rotate in the forward and reverse directions, and the operation shaft 55 is rotated in the forward and reverse directions.

As shown in FIGS. 5 and 7, the operation shaft 55 is rotationally operated by the elevating motor 56, so that the operation portion 55b of the operation shaft 55 is separated from the spool 24a of the control valve 24 toward the lowering operation position side. The position A1 and the fourth position A4 are operated to the second position A2 for pushing the spool 24a of the control valve 24 to the neutral stop position, and the third position A3 for pushing the spool 24a of the control valve 24 to the ascending operation position.

(Support structure of float of seedling planting device)
As shown in FIGS. 1, 2, and 3, the two floats 12 are located behind the right and left rear wheels 2 in a plan view and below the planting transmission case 9 in a side view. Is located in.

A bracket 27 is connected to the rear part of the support frame 8, and a float pipe 28 is arranged under the planting transmission case 9 along the left-right direction so as to be rotatable around the axis P2 in the left-right direction. It is supported by 27. The support arm 28a connected to the float pipe 28 is extended to the rear side, and the float 12 is supported so as to be able to move up and down (swingable) around the axis P3 in the left-right direction of the rear end portion of the support arm 28a. There is.

The planting depth lever 29 is connected to the float pipe 28 and extends diagonally to the upper side on the front side. The lever guide 30 is connected to the feed case 14, and the planting depth lever 29 is inserted into the lever guide 30.

By operating the planting depth lever 29 up and down, the support arm 28a of the float pipe 28 is operated up and down, and the position of the shaft core P3 (rear part of the float 12) is changed up and down. By engaging the planting depth lever 29 with the lever guide 30, the position of the shaft core P3 (rear part of the float 12) is fixed.

The frame 31 is connected to the front portions of the two floats 12, and the two floats 12 integrally swing up and down around the axis P3.
The support member 32 is connected to the left and right center portions of the frame 31 and extends to the rear side, the rake-shaped ground leveling member 33 is connected to the rear end portion of the support member 32, and the ground leveling member 33 is left and right of the machine body 3. It is located in the center.

(Float side configuration related to elevating control of seedling planting device)
As shown in FIGS. 2 and 3, the channel-shaped detection unit 40 is swingably supported around the left-right axis P4 of the bracket 31a connected to the left portion of the frame 31 when viewed from the front. , It extends upward through between the support frame 8 and the cover 54.

A connecting member 41 formed by bending a round bar member is provided. The bracket 42 is connected to the upper part of the support frame 8, and the intermediate portion of the connecting member 41 is swingably supported around the axis P5 in the left-right direction of the bracket 42.

An elongated hole 40a along the vertical direction is opened in the detection unit 40, and one end portion 41a of the connecting member 41 is inserted into the elongated hole 40a of the detection unit 40 from the lateral side. An elongated hole 29a is opened in the planting depth lever 29, and the other end portion 41b of the connecting member 41 is inserted into the elongated hole 29a of the planting depth lever 29 from the lateral side.

One end of the inner 43a of the wire 43 (corresponding to the elevating linkage mechanism) is connected to the end 41a of the connecting member 41, and one end of the outer 43b of the wire 43 is connected to the upper end of the detection unit 40. Has been done.

As the machine 3 advances, the float 12 follows the ground surface G on the ground, and when the seedling planting device 6 moves up and down with respect to the rice field surface G (float 12), the float 12 axes with respect to the seedling planting device 6. It swings up and down around the core P3, and the detection unit 40 moves up and down with respect to the seedling planting device 6 (connecting member 41). By moving the detection unit 40 up and down, the inner 43a of the wire 43 is pushed and pulled.

(Structure on the control valve side related to the elevating control of the seedling planting device)
As shown in FIGS. 4, 6, 7, and 19, the operation arm 44 (corresponding to the elevating / lowering linkage mechanism) is supported by the operation shaft 55 so as to be relatively rotatable, and the operation unit 44a of the operation arm 44 is a control valve 24. Facing the end of the spool 24a.

The operation unit 44a of the operation arm 44 and the operation unit 55b of the operation shaft 55 are arranged so as to face the end of the spool 24a of the control valve 24 in the front view and line up in the left-right direction (see FIG. 7). ). The operation unit 44a of the operation arm 44 and the operation unit 55b of the operation shaft 55 can separately push the spool 24a of the control valve 24 from the lower operation position to the neutral stop position and the ascending operation position.

A sensitivity lever 58 is swingably supported around the axis P8 in the left-right direction on the upper side of the control valve 24, and the sensitivity lever 58 extends upward through the lever guide 59. The sensitivity lever 58 is bent like a crank in a front view, and the other end of the outer 43b of the wire 43 is supported by the lower portion 58a of the sensitivity lever 58. The other end of the inner 43a of the wire 43 is connected to the upper part of the operating arm 44.

By swinging the sensitivity lever 58 around the shaft core P8, the position of the other end of the outer 43b of the wire 43 is changed along the inner 43a of the wire 43, and the sensitivity lever 58 is a lever. By engaging with the guide 59, the position of the other end of the outer 43b of the wire 43 is fixed.

(Elevation operation of the seedling planting device in the elevating control of the seedling planting device)
In the states shown in FIGS. 3, 4, 5, and 19, the operation unit 55b of the operation shaft 55 is operated to the first position A1, and the spool 24a of the control valve 24 is stopped at the neutral stop position by the operation unit 44a of the operation arm 44. Therefore, the hydraulic cylinder 5 is in a stopped state. In this state, the seedling planting device 6 is maintained at the set height H1 from the field surface G, and the seedling planting depth by the seedling planting device 6 (planting arm 11) is maintained at the set planting depth. To.

When the seedling planting device 6 descends from the state shown in FIG. 3 and approaches the rice field surface G, the float 12 rises with respect to the seedling planting device 6, and the detection unit 40 rises with respect to the connecting member 41. Then, the inner 43a of the wire 43 is pulled toward the seedling planting device 6 side.

As shown in FIGS. 4, 5 and 19, when the inner 43a of the wire 43 is pulled toward the seedling planting device 6, the operation arm 44 swings counterclockwise in FIG. 4, and the operation arm 44 The operation unit 44a pushes the spool 24a of the control valve 24 to the ascending operation position, the hydraulic cylinder 5 ascends, and the seedling planting device 6 ascends.

When the seedling planting device 6 is raised, the inner 43a of the wire 43 is pushed toward the operation arm 44, and when the seedling planting device 6 returns to the set height H1, the upper end of the detection unit 40 is operated. The positional relationship between the portion and the end portion 41a of the connecting member 41 (the length of the inner 43a protruding from the outer 43b of the wire 43) returns to the state shown in FIG.

The spring inside the control valve 24 allows the spool 24a of the control valve 24 to operate in the neutral stop position, and the spring inside the control valve 24 allows the spool 24a of the control valve 24 to operate the operation arm 44. While pushing the operation unit 44a of the above, it operates to the neutral stop position and is stopped at the neutral stop position by the operation unit 44a of the operation arm 44.

When the spool 24a of the control valve 24 is stopped at the neutral stop position, the raising operation of the hydraulic cylinder 5 is stopped, the raising operation of the seedling planting device 6 is stopped, and the seedling planting device 6 is stopped at the set height H1. Then, the planting depth of the seedlings by the seedling planting device 6 (planting arm 11) returns to the set planting depth.

(Descent operation of the seedling planting device in the raising / lowering control of the seedling planting device)
When the seedling planting device 6 rises from the state shown in FIG. 3 and moves away from the rice field surface G, the float 12 descends with respect to the seedling planting device 6, and the detection unit 40 descends with respect to the connecting member 41. The inner 43a of the wire 43 is pushed toward the operation arm 44.

As shown in FIGS. 4, 5 and 19, when the inner 43a of the wire 43 is pushed toward the operation arm 44, the spool 24a of the control valve 24 is stopped at the neutral stop position by the operation unit 44a of the operation arm 44. The operation disappears.

The spring inside the control valve 24 allows the spool 24a of the control valve 24 to operate in the lowering operation position, and the spring inside the control valve 24 allows the spool 24a of the control valve 24 to operate the operation arm 44. The hydraulic cylinder 5 is lowered and the seedling planting device 6 is lowered by operating the operation unit 44a while pushing the operation unit 44a.

When the seedling planting device 6 is lowered, the inner 43a of the wire 43 is pulled toward the seedling planting device 6, and when the seedling planting device 6 returns to the set height H1, the detection unit 40 The positional relationship between the upper end portion of the wire 43 and the end portion 41a of the connecting member 41 (the length of the inner 43a protruding from the outer 43b of the wire 43) returns to the state shown in FIG.

When the inner 43a of the wire 43 is pulled toward the seedling planting device 6, the operation arm 44 swings counterclockwise in FIG. 4, and the operation portion 44a of the operation arm 44 causes the spool 24a of the control valve 24 to swing. Is pushed to the neutral stop position and stopped at the neutral stop position.

When the spool 24a of the control valve 24 is stopped at the neutral stop position, the lowering operation of the hydraulic cylinder 5 is stopped, the lowering operation of the seedling planting device 6 is stopped, and the seedling planting device 6 is stopped at the set height H1. Then, the planting depth of the seedlings by the seedling planting device 6 (planting arm 11) returns to the set planting depth.

As described above (upward operation of the seedling planting device in the raising / lowering control of the seedling planting device) and (lowering operation of the seedling planting device in the raising / lowering control of the seedling planting device) of this section, the control valve 24 The height of the seedling planting device 6 with respect to the float 12 is mechanically transmitted to the control valve 24 by the wire 43 and the operation arm 44 provided over the float 12 and the spool 24a of the control valve 24 is operated. , The seedling planting device 6 is maintained at the set height H1 from the rice field G.

In this case, when the operation unit 55b of the operation shaft 55 is operated to the first position A1 or the fourth position A4, the spool 24a of the control valve 24 is operated by the wire 43 and the operation arm 44 as described above. Then, the seedling planting device 6 is maintained at the set height H1 from the rice field G.

(Change of seedling setting planting depth)
The state shown in FIG. 3 is a state in which the position of the axis P3 (rear part of the float 12) is closest to the seedling planting device 6, and the set height H1 (see FIG. 19) is the lowest state (see seedlings). The set planting depth is the deepest).

When the planting depth lever 29 is operated from the state shown in FIG. 3 and the position of the shaft core P3 (rear part of the float 12) with respect to the seedling planting device 6 is changed to the lower side, the set height H1 becomes higher. As the seedlings become shallower, the set planting depth of the seedlings becomes shallower.

When the planting depth lever 29 is operated to change the set planting depth of the seedlings, the positions of the float 12 and the detection unit 40 with respect to the seedling planting device 6 change up and down. The connecting member 41 is swung around the axis P5 in conjunction with the planting depth lever 29, and the position of the end portion 41a of the connecting member 41 is changed up and down as described below. ..

When the set planting depth of the seedling is changed to the deep side (lower side of the set height H1) by the planting depth lever 29 (when the position of the detection unit 40 rises with respect to the seedling planting device 6), Along with this, the position of the inner 43a of the wire 43 (the end portion 41a of the connecting member 41) is also changed to the upper side.

When the set planting depth of the seedling is changed to the shallow side (high side of the set height H1) by the planting depth lever 29 (when the position of the detection unit 40 is lowered with respect to the seedling planting device 6), Along with this, the position of the inner 43a of the wire 43 (the end portion 41a of the connecting member 41) is also changed to the lower side.

As described above, even if the planting depth lever 29 is operated to change the set planting depth of the seedlings, the positional relationship between the upper end portion of the detection unit 40 and the end portion 41a of the connecting member 41 (the wire 43). The length of the inner 43a coming out of the outer 43b) is maintained in the state shown in FIG.

As a result, as described in the above-mentioned (uplifting operation of the seedling planting device in the raising / lowering control of the seedling planting device) and (lowering operation of the seedling planting device in the raising / lowering control of the seedling planting device), the seedling planting device. 6 is maintained at the set height H1 from the field surface G, and the planting depth of the seedlings by the seedling planting device 6 (planting arm 11) is maintained at the set planting depth.

(Change the sensitivity of the raising and lowering control of the seedling planting device)
In the raising / lowering control of the seedling planting device 6 described above (the raising operation of the seedling planting device in the raising / lowering control of the seedling planting device) and (the lowering operation of the seedling planting device in the raising / lowering control of the seedling planting device). As described below, the sensitivity of the elevating control can be set to sensitive and insensitive by the sensitivity lever 58.

The states shown in FIGS. 3, 4, and 19 are states in which the sensitivity lever 58 is operated at the center position of the operating range. When the operation position of the sensitivity lever 58 is changed to the sensitive side, the length of the inner 43a of the wire 43 that goes out to the operation arm 44 side becomes longer, and the length of the inner 43a of the wire 43 that goes out to the seedling planting device 6 side becomes longer. It gets shorter.

As a result, the posture of the float 12 in the state where the spool 24a of the control valve 24 is stopped at the neutral stop position is slightly downward, and the ground contact area of the pad surface G of the float 12 becomes large, and the float 12 is the pad surface G. It will be in a state of sensitively following the ground.
When the float 12 sensitively follows the ground surface G, the spool 24a of the control valve 24 is sensitively operated, and the sensitivity of the elevating control becomes sensitive.

When the operation position of the sensitivity lever 58 is changed to the insensitive side, the length of the inner 43a of the wire 43 that goes out to the operation arm 44 side becomes shorter, and the length of the inner 43a of the wire 43 that goes out to the seedling planting device 6 side becomes shorter. become longer.

As a result, the posture of the float 12 in the state where the spool 24a of the control valve 24 is stopped at the neutral stop position becomes slightly upward, and the ground contact area of the contact area G of the float 12 becomes smaller, and the float 12 becomes the contact area G. It becomes a state of following the ground insensitively.
When the float 12 follows the field surface G insensitively to the ground, the spool 24a of the control valve 24 is operated insensitively, and the sensitivity of the elevating control becomes insensitive.

(First work linkage mechanism provided over the elevating motor and the planting clutch)
As shown in FIGS. 4 and 8, a first work linking mechanism 61 is provided over the elevating motor 56 and the planting clutch 21. The first work linking mechanism 61 is provided with a first linking portion 63, a swinging section 64, a second linking section 65, and the like, as described below.

As shown in FIGS. 4, 8, 10 and 11, on the right outer side of the right airframe frame 60, the swing portion 64 is swingably supported around the axis P9 in the left-right direction. The swing portion 64 is configured by bending a plate material into a channel shape in a plan view, and a long hole 64a in an outer portion of the swing portion 64 is opened.

As shown in FIGS. 5, 6 and 7, an arm portion 55c is connected to a portion of the operating shaft 55 opposite to the operating gear 55a. The linking portion 63 is connected to the arm portion 55c of the operating shaft 55, and as shown in FIGS. It has been inserted.

As shown in FIG. 8, the linking portion 63 is arranged along the vertical direction with respect to the virtual line connecting the operation shaft 55 (axis core P7) and the shaft core P9 of the swing portion 64 in the side view. The elongated hole 64a of the swing portion 64 is arranged on the rear side (opposite side of the planting clutch 21).

As shown in FIGS. 4, 5, 8 and 10, by rotating the operation shaft 55 by the elevating motor 56, the operation unit of the linkage unit 63 is interlocked with the operation unit 55b and the arm unit 55c of the operation shaft 55. 63a is operated at the first position A1, the fourth position A4, the second position A2, and the third position A3 (see the above-mentioned (configuration relating to the control valve and the elevating motor for elevating operation of the seedling planting device)).

As shown in FIGS. 4, 10 and 11, the interchangeable portion 67 provided with the operation portion 63a of the linking portion 63 and the elongated hole 64a of the swinging portion 64 is the first linking portion 63 and the swinging portion 64. It is provided in the connection portion and is provided in the first work linkage mechanism 61.

As shown in FIGS. 8, 10 and 11, the length adjusting portion 66 is attached to the swing portion 64 (see (Structure of the length adjusting portion) (Operation of the length adjusting portion) described later), and has a rod shape. 65 is connected to the length adjusting unit 66.

A long hole 60a along the front-rear direction is opened in the right machine frame 60, and the linking portion 65 passes through the long hole 60a of the machine frame 60 from the length adjusting portion 66, and the right and left machine frames 60. It goes in between and extends to the front. The linking portion 65 is connected to the planting clutch 21 as described later (operating member for operating the planting clutch).

(Operating member that operates the planting clutch)
As shown in FIGS. 8 and 12, a planting clutch 21 is provided inside the rear portion of the mission case 73, and the planting clutch 21 is arranged between the right and left airframe frames 60 in a plan view. There is. An operation rod 68 that operates the planting clutch 21 at the transmission position and the cutoff position is supported by the mission case 73 so as to be slidable in the vertical direction.

As shown in FIGS. 12 to 15, a pair of flat plate-shaped (rib-shaped) support portions 83 along the vertical direction and the front-rear direction are provided in the vicinity of the operation rod 68 in the mission case 73, and one side thereof. And the inner surface of the support portion 83 on the other side is opened at a predetermined interval W1. A pin-shaped support shaft 84 is provided, and one side portion and the other side portion of the support shaft 84 are supported by the support portion 83 on the one side and the other side.

A first operating member 69 is provided, which is formed by bending a plate material. Operation member spacing portions 69c connected to the operation member 69 over one side operation member portion 69a, the other side operation member portion 69b, one side and the other side operation member portions 69a, 69b, one side and the other side. It was opened to the arm portion 69d extending forward from the operating member portions 69a and 69b, the operating member swinging portion 69e extending downward from the operating member portion 69a on one side, and the operating member swinging portion 69e. A long hole 69f and a contact portion 69g extending from the operation member spacing portion 69c are provided.

In the portion between the support portions 83 on one side and the other side of the support shaft 84, the operation member portions 69a and 69b on one side and the other side of the operation member 69 can swing around the axis P10 of the support shaft 84. It is supported, and the arm portion 69d of the operating member 69 is connected to the lower part of the operating rod 68.

The front end 65a of the linking portion 65 is inserted into the elongated hole 69f of the operating member 69. As a result, the first work linking mechanism 61 is provided over the elevating motor 56 and the operating member 69 via the operating shaft 55, and the operating shaft is provided over the elevating motor 56 and the planting clutch 21. A first work linking mechanism 61 is provided via the 55 and the operating member 69.

By swinging the operating member 69 around the axis P10, the operating rod 68 (planting clutch 21) is operated to the transmission position and the cutoff position. When the operating member 69 is operated to the cutoff position, the contact portion 69g of the operating member 69 hits the support portion 83 on the other side, and the swinging beyond the transmission position of the operating member 69 is stopped.

A first spring 71 is connected to the operating member 69, the operating member 69 is urged counterclockwise in FIG. 12, and the operating rod 68, the operating member 69, and the planting clutch 21 are spring 71. Is urged to the cutoff position.

The spacing between the outer surfaces of the operating member portions 69a and 69b on one side and the other side of the operating member 69 is maintained at a predetermined spacing W1 by the operating member spacing portion 69c of the operating member 69. As a result, when the operating member 69 is swung, the outer surfaces of the operating member portions 69a and 69b on one side and the other side of the operating member 69 are in contact with the inner surfaces of the support portions 83 on the one side and the other side. Sliding.

In other words, the distance W1 between the operation member portions 69a and 69b on one side and the other side of the operation member 69 in the direction along the axis of the support shaft 84 is the operation member portion 69a on one side of the operation member 69. Is in contact with the support portion 83 on one side, and the operation member portion 69b on the other side of the operation member 69 is maintained at the interval W1 in contact with the support portion 83 on the other side. A portion 69c is provided.

(Coupling member provided adjacent to the operating member that operates the planting clutch)
As shown in FIGS. 12 to 15, a linking member 70 formed by bending a plate material is provided.

A linking member portion 70a on one side, a linking member portion 70b on the other side, a linking member spacing portion 70c connected to the linking member 70 over the linking member portions 70a and 70b on the one side and the other side, and a linking member on one side. A linking member swinging portion 70e extending downward from the portion 70a, a connecting portion 70d provided in the linking member swinging portion 70e, and a long hole 70f opened in the linking member swinging portion 70e are provided.

As shown in FIGS. 13 and 14, a linking member portion 70a on one side of the linking member 70 is provided on the outer portion of the support shaft 84 on the opposite side of the operating member 69 with respect to the support portion 83 on one side. It is swingably supported around the axis P10 of 84. A linking member portion 70b on the other side of the linking member 70 can swing around the axis P10 of the support shaft 84 on the outer portion on the opposite side of the operating member 69 with respect to the support portion 83 on the other side of the support shaft 84. Is supported by.

Due to the linking member spacing portion 70c of the linking member 70, the spacing between the inner surfaces of the linking member portions 70a and 70b on one side and the other side of the linking member 70 becomes a predetermined spacing W2 on the outer surface of the support portion 83 on the one side and the other side. It is maintained. As a result, when the linking member 70 is swung, the inner surfaces of the linking member portions 70a and 70b on one side and the other side of the linking member 70 are in contact with the outer surfaces of the support portions 83 on the one side and the other side. Sliding.

In other words, the distance W2 in the direction along the axis P10 of the support shaft 84 of the linking member portions 70a and 70b on one side and the other side of the linking member 70 is the linking member portion on one side of the linking member 70. The linking member of the linking member 70 is maintained at a distance W2 so that the 70a is in contact with the support portion 83 on one side and the linking member portion 70b on the other side of the linking member 70 is in contact with the support portion 83 on the other side. An interval portion 70c is provided.

As shown in FIGS. 13, 14 and 15, the operating member swinging portion 69e of the operating member 69 and the linking member swinging portion 70e of the linking member 70 are adjacent to each other, and the front end portion 65a of the linking portion 65 is located. , The elongated hole 69f of the operating member 69 and the elongated hole 70f of the linking member 70 are inserted.

At the end portion 65a of the linking portion 65, a spacer 85 is attached to a portion between the operating member swinging portion 69e of the operating member 69 and the linking member swinging portion 70e of the linking member 70.
As a result, the distance between the operating member swinging portion 69e of the operating member 69 and the linking member swinging portion 70e of the linking member 70 is maintained at a predetermined gap W3 which is the width of the spacer 85.

(Second work linkage mechanism provided over the first work linkage mechanism and the fertilizer application clutch)
As shown in FIGS. 8, 12, and 13, a fertilizer application clutch 22 is provided at the rear of the mission case 73, and a second work linkage mechanism 62 extends over the first work linkage mechanism 61 and the fertilizer application clutch 22. Is provided. The second work linking mechanism 62 is provided with a second operating member 75, a third linking portion 76, and the like, as described below.

An operating member 75 that operates the fertilizer application clutch 22 at the transmission position and the cutoff position is swingably supported around the vertical axis P11 at the bottom of the fertilizer application clutch 22. A rod-shaped linking portion 76 is connected to the connecting portion 70d of the linking member 70 and the operating member 75.

A second spring 72 is connected to the operating member 75, the operating member 75 is urged counterclockwise by the spring 72, and the operating member 75 and the fertilizer application clutch 22 are attached to the shutoff position by the spring 72. It is being pushed.

As a result, the second work linking mechanism 62 is provided over the linking member 70 and the second operating member 75, and the linking member 70 extends over the first work linking mechanism 61 and the fertilizer application clutch 22. A second work linkage mechanism 62 is provided via the second operation member 75 and the second operation member 75.

(Structure of length adjustment part)
As shown in FIGS. 8, 10 and 11, the length adjusting portion 66 is provided with an adjusting portion 86, a connecting portion 87 and the like.

The end portion of the triangular and flat plate-shaped adjusting portion 86 when viewed from the side is supported so as to be swingable up and down around the axis P12 in the left-right direction of the swinging portion 64. A long hole 64b along the vertical direction is opened in the swinging portion 64, and an end portion 65b of the linking portion 65 is inserted into the long hole 64b of the swinging portion 64 and connected to the adjusting portion 86.

Three connecting holes 86a, 86b, 86c are opened in the adjusting portion 86 along the vertical direction, and one connecting hole 64c is opened in the swing portion 64. In the state shown in FIG. 10, the connecting portion 87 provided with bolts and nuts is inserted into the connecting hole 86a of the adjusting portion 86 and the connecting hole 64c of the swinging portion 64, and the adjusting portion 86 is inserted into the swinging portion 64 in FIG. It is in a connected state at the position shown in.

As shown in FIGS. 8, 10 and 11, the length adjusting portion 66 and the swinging portion 64 are arranged on the right outer side of the right airframe frame 60 in a plan view, and at a position close to the rear wheel 2 in a side view. It is located behind a certain aircraft 3.

The length adjusting portion 66 is provided at the connecting portion between the second linking portion 65 and the swing portion 64, and is arranged on the front side of the shaft core P9 of the swing portion 64 in a side view. The length adjusting portion 66 is arranged outside the rocking portion 64 in a plan view, and the linking portion 65 is arranged on the right side of the airframe frame 60 with respect to the swinging portion 64 in a plan view. ..

(Operation of length adjustment part)
In FIGS. 10 and 11, when the adjusting portion 86 is swung up and down with the connecting portion 87 removed, the moving direction of the linking portion 65 (left and right in FIG. 10), which is the direction along the linking portion 65. The adjusting unit 86 is oscillated in a direction intersecting the direction). As the adjusting portion 86 is oscillated, the end portion 65b of the linking portion 65 is also oscillated around the axis P12, and is oscillated in a direction intersecting the moving direction of the linking portion 65.

When the adjusting portion 86 is swung upward from the state shown in FIG. 10, the position of the end portion 65b of the linking portion 65 is adjusted in length from the position shown in FIG. 10 along the moving direction of the linking portion 65. It moves a little to the opposite side of the portion 66 (shaft core P12), and then moves a little to the length adjusting part 66 (shaft core P12) side.

In FIG. 10, when the connecting portion 87 is inserted into the connecting hole 86a of the adjusting portion 86 and the adjusting portion 86 is connected to the swinging portion 64, the position of the end portion 65b of the linking portion 65 is the position of the length adjusting portion 66 (axis core). Located on the farthest side from P12), the length from the elevating motor 56 of the first work linking mechanism 61 to the planting clutch 21 is the longest.

When the connecting portion 87 is inserted into the connecting hole 86b of the adjusting portion 86 and the adjusting portion 86 is connected to the swinging portion 64, the position of the end portion 65b of the linking portion 65 is slightly aligned with the length adjusting portion 66 (axis core P12). Located on the near side, the length from the elevating motor 56 of the first work linking mechanism 61 to the planting clutch 21 is slightly shorter than the above-mentioned state.

When the connecting portion 87 is inserted into the connecting hole 86c of the adjusting portion 86 and the adjusting portion 86 is connected to the swinging portion 64, the position of the end portion 65a of the linking portion 65 is the most in the length adjusting portion 66 (axis core P12). Located on the closest side, the length from the elevating motor 56 of the first work linking mechanism 61 to the planting clutch 21 is the shortest.

As described above, the adjusting portion 86 is swung up and down, the connecting portion 87 is inserted into the connecting holes 86a, 86b, 86c of the adjusting portion 86 and the connecting hole 64c of the swinging portion 64, and the adjusting portion 86 is inserted. By connecting to the swinging portion 64, the connection position of the swinging portion 64 at the end portion 65b of the linking portion 65 is changed in three stages along the moving direction of the linking portion 65.

As a result, the position of the end portion 65b of the linking portion 65 is slightly changed back and forth along the moving direction of the linking portion 65, and extends from the elevating motor 56 of the first work linking mechanism 61 to the planting clutch 21. The length is adjusted.

(Operation to the cutoff position of the planting clutch and fertilizer application clutch by the elevating motor)
As shown in FIGS. 8 and 10, when the arm portion 55c of the operation shaft 55 is operated to the first position A1 by the elevating motor 56, the operation portion 63a of the linkage portion 63 is located at the first position A1. ing.

When the operating portion 63a of the linking portion 63 is located at the first position A1, the operating member 69 is operated counterclockwise in FIG. 12 by the spring 71, the planting clutch 21 is operated to the breaking position, and the spring 72 is operated. The operation member 75 is operated in the counterclockwise direction of FIG. 13, and the fertilizer application clutch 22 is operated to the cutoff position. In the state shown in FIGS. 12 and 13, the end portion 65a of the linking portion 65 is located in the front-rear intermediate portion of the elongated hole 69f of the operating member 69, and is located in the rear portion of the elongated hole 70f of the linking member 70.

As shown in FIGS. 8 and 10, even if the arm portion 55c of the operation shaft 55 is operated to the second position A2 and the third position A3 by the elevating motor 56, the operation portion 63a of the linkage portion 63 is moved to the swing portion. The swing portion 64 is not operated and the planting clutch 21 and the fertilizer application clutch 22 are maintained in the cutoff position only by moving the second position A2 and the third position A3 along the elongated hole 64a (flexible portion 67) of the 64. To.

As described above, the state in which the arm portion 55c of the operation shaft 55 is operated by the elevating motor 56 to the first position A1, the second position A2, and the third position A3 is the state in which the first and second work linkage mechanisms 61, The planting clutch 21 and the fertilizer application clutch 22 are operated to the cutoff position via the 62, the first and second springs 71 and 72.

The operation of operating the spool 24a of the control valve 24 to the ascending operation position in preference to the wire 43 and the operation arm 44 in the elevating motor 56, and the operation of the spool 24a of the control valve 24 by the wire 43 and the operating arm 44 in the elevating motor 56. The operation of maintaining the state is not transmitted to the planting clutch 21 and the fertilizer application clutch 22 (operating member 69) by the flexible portion 67.

(Operation of the planting clutch and fertilizer application clutch to the transmission position by the elevating motor)
As shown in FIGS. 8 to 9, when the arm portion 55c of the operation shaft 55 is operated to the fourth position A4 by the elevating motor 56, the operation portion 63a of the linkage portion 63 becomes the elongated hole 64a of the swing portion 64. It reaches the upper end portion and moves to the fourth position A4 (see FIG. 10), the swinging portion 64 is swung in the counterclockwise direction of FIG. 9, and the linking portion 65 is pulled to the rear side.

When the linking portion 65 is pulled backward from the state shown in FIGS. 12 and 13, the end portion 65a of the linking portion 65 is located at the rear portion of the elongated hole 70f of the linking member 70, so that the linking member is located. The 70 is swung counterclockwise in FIG. 12, the linking portion 76 is pulled backward, and the operating member 75 begins to be operated from the cutoff position to the transmission position side against the spring 72.

In this case, since the end portion 65a of the linking portion 65 is located in the front-rear intermediate portion of the long hole 69f of the operating member 69, the end portion 65a of the linking portion 65 is located along the long hole 69f of the operating member 69. The operation member 69 is not operated only by moving to the rear side, and the planting clutch 21 is maintained at the cutoff position.

When the end portion 65a of the linking portion 65 reaches the rear end portion of the elongated hole 69f of the operating member 69, the operating member 69 shuts off against the spring 71 as the linking portion 65 is pulled to the rear side. The swing operation starts from the position to the transmission position side. By pulling the linking portion 65 to the rear side, the fertilizer application clutch 22 is operated to the transmission position, and the planting clutch 21 is operated to the transmission position with a slight delay.

As described above, as the planting clutch 21 is operated to the transmission position, the fertilizer application clutch 22 is operated to the transmission position by the linkage member 70, the second work linkage mechanism 62, and the second operation member 75. The clutch.
The operation of operating the planting clutch 21 and the fertilizer application clutch 22 in the elevating motor 56 to the transmission position is transmitted to the planting clutch 21 and the fertilizer application clutch 22 by the accommodation portion 67.

As shown in FIG. 1, in the fertilizer application device 7, since the feeding portion 16 and the groove making device 18 (field surface G) are slightly separated from each other, the fertilizer applying clutch 22 is operated to the transmission position, and the first fertilizer is fertilized from the feeding portion 16. When the fertilizer is fed out, it takes some time for the first fertilizer to reach the groove making device 18 (field surface G).

Shortly before the planting clutch 21 is operated to the transmission position, the fertilizer application clutch 22 is operated to the transmission position, so that the first fertilizer reaches the groove making device 18 (field G) almost at the same time. The planting of seedlings by the planting arm 11 can be started.

As described above, the state in which the arm portion 55c of the operation shaft 55 is operated to the fourth position A4 by the elevating motor 56 is the state where the first and second work linkage mechanisms 61 and 62 operate the first and second springs. The planting clutch 21 and the fertilizer application clutch 22 are operated to the transmission position against 71 and 72.

When the arm portion 55c of the operation shaft 55 is operated to the fourth position A4 by the elevating motor 56, the operation of operating the planting clutch 21 in the elevating motor 56 to the transmission position is performed from the first work linkage mechanism 61 to the second. The fertilizer application clutch 22 is transmitted to the fertilizer application clutch 22 via the work linkage mechanism 62, and the fertilizer application clutch 22 is operated to the transmission position against the second spring 72.

As shown in FIGS. 9 to 8, when the arm portion 55c of the operation shaft 55 is operated to the first position A1 (second position A2) (third position A3) by the elevating motor 56, the swing portion 64 is linked. Since the pulling operation of the portion 65 is eliminated, the planting clutch 21 and the fertilizer application clutch 22 are provided by the springs 71 and 72 as described in the above-mentioned (operation of the planting clutch and the fertilizer application clutch to the cutoff position by the elevating motor). Is operated to the cutoff position almost at the same time.

As described above, as the planting clutch 21 is operated to the cutoff position, the fertilizer application clutch 22 is moved to the cutoff position via the linkage member 70, the second work linkage mechanism 62, and the second operation member 75. Be manipulated.

(Configuration for raising and lowering the seedling planting device using the operation lever)
As shown in FIGS. 1 and 19, a steering handle 77 for steering and operating the front wheel 1 is provided on the front portion of the airframe 3, and an operating lever 78 (corresponding to an operating tool) is provided on the lower right side of the steering handle 77. ) Is provided and extends to the right side.

The operating lever 78 has a neutral position N, a first ascending position U1, a second ascending position U2 (corresponding to an ascending position), a first descending position D1, a second descending position D2 (corresponding to a descending position), and a right marker on the rear side. The position R1 and the left marker position L1 on the front side can be artificially operated. The operation lever 78 is urged to the neutral position N so that the operation lever 78 automatically returns to the neutral position N when the operator releases the operation lever 78.

The control device 100 is provided on the machine body 3, a position sensor (not shown) for detecting the operation position of the operation lever 78 is provided, and the operation position of the operation lever 78 is input to the control device 100. An angle sensor 79 (corresponding to the upper limit position detection unit) (corresponding to the lower limit position detection unit) for detecting the vertical angle of the link mechanism 4 with respect to the machine body 3 is provided, and the detection value of the angle sensor 79 is input to the control device 100. ing.

As shown in FIGS. It is input to the device 100. By detecting the rotation angle of the operation shaft 55 by the position sensor 80, the positions of the operation portion 55b and the arm portion 55c of the operation shaft 55 are detected.

The elevating control unit 101 is provided in the control device 100 as software, and the operating position of the operating lever 78 (neutral position N, first ascending position U1, second ascending position U2, first descending position D1, second descending position). Based on the detected values of D2) and the angle sensor 79, the elevating control unit 101 (control device 100) operates the elevating motor 56 as described below.

(The raising operation of the seedling planting device by the first raising position of the operation lever)
The elevating motor 56 operates the operation portion 55b and the arm portion 55c of the operation shaft 55 to the fourth position A4, and the elevating motor 56 operates the planting clutch 21 and the fertilizer application clutch 22 to the transmission position, as shown in FIG. It is assumed that the spool 24a of the control valve 24 is operated by the wire 43 and the operation arm 44.

In the above-mentioned state, as shown in FIGS. 19 and 22, when the operating lever 78 is operated to the first ascending position U1 (step S1), the elevating motor 56 causes the operating portion 55b and the arm portion 55c of the operating shaft 55 to move. , Operated at the third position A3 (step S2).

As a result, the planting clutch 21 and the fertilizer application clutch 22 are operated to the cutoff position (see the above-mentioned (operation of the planting clutch and the fertilizer application clutch to the cutoff position by the elevating motor)), and the wire 43 and the operation arm 44 are given priority. , The spool 24a of the control valve 24 is pushed to the ascending operation position, the hydraulic cylinder 5 is ascended, and the seedling planting device 6 is ascended.

When the operating lever 78 is operated from the first ascending position U1 to the neutral position N (steps S1 and S6), the operating shaft 55 operating portion 55b and arm portion 55c are operated to the second position A2 by the elevating motor 56. (Step S7).

As a result, with the planting clutch 21 and the fertilizer application clutch 22 operated to the cutoff position, the spool 24a of the control valve 24 is returned to the neutral stop position in preference to the wire 43 and the operation arm 44, and the hydraulic cylinder is operated. 5 and the seedling planting device 6 are stopped.

When the angle sensor 79 detects that the link mechanism 4 has reached the upper limit position in a state where the operation lever 78 is operated to the first ascending position U1 (a state in which the seedling planting device 6 is operated ascending) ( In step S4), the operation portion 55b and the arm portion 55c of the operation shaft 55 are operated to the second position A2 by the elevating motor 56 (step S7).

As a result, even when the operating lever 78 is operated to the first rising position U1, the spool 24a of the control valve 24 is returned to the neutral stop position in preference to the wire 43 and the operating arm 44, and the hydraulic cylinder 5 and the hydraulic cylinder 5 and the operating arm 44 are operated. The seedling planting device 6 stops at the upper limit position.

(The raising operation of the seedling planting device by the second raising position of the operation lever)
As shown in FIGS. 19 and 22, when the operating lever 78 is operated to the second ascending position U2 (step S1), the operating portion 55b and the arm portion 55c of the operating shaft 55 are moved to the third position A3 by the elevating motor 56. It is operated (step S3).

As a result, the planting clutch 21 and the fertilizer application clutch 22 are operated to the cutoff position (see the above-mentioned (operation of the planting clutch and the fertilizer application clutch to the cutoff position by the elevating motor)), and the wire 43 and the operation arm 44 are given priority. , The spool 24a of the control valve 24 is pushed to the ascending operation position, the hydraulic cylinder 5 is ascended, and the seedling planting device 6 is ascended.

Even if the operating lever 78 is operated from the second ascending position U2 to the neutral position N (step S1), the operating portion 55b and the arm portion 55c of the operating shaft 55 are maintained at the third position A3 by the elevating motor 56 (step S3). ), The state in which the spool 24a of the control valve 24 is pushed to the ascending operation position is maintained in preference to the wire 43 and the operating arm 44, and the ascending operation of the hydraulic cylinder 5 and the ascending operation of the seedling planting device 6 are performed. Will continue.

As described above, when it is detected by the angle sensor 79 that the link mechanism 4 has reached the upper limit position while the raising operation of the hydraulic cylinder 5 and the raising operation of the seedling planting device 6 are continued (step S5). The lifting motor 56 operates the operating portion 55b and the arm portion 55c of the operating shaft 55 to the second position A2 (step S7).

As a result, the spool 24a of the control valve 24 is returned to the neutral stop position in preference to the wire 43 and the operation arm 44, and the hydraulic cylinder 5 and the seedling planting device 6 are stopped at the upper limit position.

(Descent operation of the seedling planting device by the first lowering position of the operation lever)
At a position where the seedling planting device 6 (float 12) is separated from the rice field surface G upward, the operation portion 55b and the arm portion 55c of the operation shaft 55 are operated by the elevating motor 56 to the second position A2, and the seedling planting device 6 is operated. Is stopped, and it is assumed that the planting clutch 21 and the fertilizer application clutch 22 are operated to the cutoff position by the elevating motor 56.

When the float 12 is separated from the rice field surface G upward, the float 12 is lowered with respect to the seedling planting device 6, and the detection unit 40 is lowered with respect to the connecting member 41, so that the inner wire 43 is inner. The 43a is pushed toward the operation arm 44.

In the above-mentioned state, as shown in FIGS. Is operated to the first position A1 (step S11).

Since the operation of stopping the spool 24a of the control valve 24 at the neutral stop position by the operation unit 55b of the operation shaft 55 disappears, the spool 24a of the control valve 24 may be operated to the lower operation position by the spring inside the control valve 24. Permissible.

As a result, the spool 24a of the control valve 24 is operated by the wire 43 and the operation arm 44, and the spool 24a of the control valve 24 causes the operation portion 44a of the operation arm 44 by the spring inside the control valve 24. The hydraulic cylinder 5 is lowered while being pushed to the lowering operation position, and the seedling planting device 6 is lowered (see the above-mentioned (lowering operation of the seedling planting device in the raising / lowering control of the seedling planting device)). .. The planting clutch 21 and the fertilizer application clutch 22 are operated (maintained) at the cutoff position.

When the operating lever 78 is operated from the first descending position D1 to the neutral position N (steps S1 and S13), the operating shaft 55 operating portion 55b and arm portion 55c are operated to the second position A2 by the elevating motor 56. (Step S14).

As a result, with the planting clutch 21 and the fertilizer application clutch 22 operated to the cutoff position, the spool 24a of the control valve 24 is returned to the neutral stop position in preference to the wire 43 and the operation arm 44, and the hydraulic cylinder is operated. 5 and the seedling planting device 6 are stopped.

For example, when the operating lever 78 is operated to the first descending position D1 on a road or the like, the link mechanism 4 may reach the lower limit position.
When the angle sensor 79 detects that the link mechanism 4 has reached the lower limit position in the state where the operation lever 78 is operated to the first lowering position D1 (the state where the seedling planting device 6 is being lowered) ( Step S12), the operation portion 55b and the arm portion 55c of the operation shaft 55 are operated to the second position A2 by the elevating motor 56 (step S14).

As a result, even when the operation lever 78 is operated to the first lowering position D1, the spool 24a of the control valve 24 is returned to the neutral stop position in preference to the wire 43 and the operation arm 44, and the hydraulic cylinder 5 and the hydraulic cylinder 5 and the operation arm 44 are operated. The seedling planting device 6 stops at the lower limit position.

(Descent operation of the seedling planting device by the second lowering position of the operation lever)
As shown in FIGS. 19, 22, and 24, when the operation lever 78 is operated to the second lowering position D2 (step S1), the operation portion 55b and the arm portion 55c of the operation shaft 55 are moved to the first position by the elevating motor 56. It is operated by A1 (steps S21 and S22).

As described above (lowering operation of the seedling planting device by the first lowering position of the operating lever), the spool 24a of the control valve 24 is operated by the wire 43 and the operating arm 44, and the control valve 24 is operated. The spool 24a of the above is operated to the lowering operation position, the hydraulic cylinder 5 is lowered, and the seedling planting device 6 is lowered. The planting clutch 21 and the fertilizer application clutch 22 are operated (maintained) at the cutoff position.

Even if the operating lever 78 is operated from the second descending position D2 to the neutral position N (steps S22 to S25), the operating portion 55b and the arm portion 55c of the operating shaft 55 are maintained at the first position A1 by the elevating motor 56 (steps S22 to S25). Step S22), the state in which the spool 24a of the control valve 24 is operated by the wire 43 and the operation arm 44 is maintained, and the lowering operation of the hydraulic cylinder 5 and the lowering operation of the seedling planting device 6 are continued.

When the float 12 touches the field surface G, the seedling planting device 6 is maintained at the set height H1 due to the state in which the spool 24a of the control valve 24 is operated by the wire 43 and the operation arm 44, and the seedling planting device is maintained. The seedling planting depth by 6 (planting arm 11) is maintained at the set planting depth (the above-mentioned (elevation operation of the seedling planting device in the elevating control of the seedling planting device) and (seedling). See (lowering operation of the seedling planting device) in the raising / lowering control of the planting device).

For example, when the operating lever 78 is operated to the second descending position D2 on a road or the like, the link mechanism 4 may reach the lower limit position. When the angle sensor 79 detects that the link mechanism 4 has reached the lower limit position (step S25), the elevating motor 56 operates the operation portion 55b and the arm portion 55c of the operation shaft 55 to the second position A2 (step S25). Step S26).

As a result, the spool 24a of the control valve 24 is returned to the neutral stop position in preference to the wire 43 and the operation arm 44, and the hydraulic cylinder 5 and the seedling planting device 6 are stopped at the lower limit position.

(Operation of the planting clutch and fertilizer application clutch to the transmission position by the second lowering position of the operation lever)
As described above (lowering operation of the seedling planting device by the second lowering position of the operating lever), the operating lever 78 is operated to the second lowering position D2 and then to the neutral position N to be operated again to the second. When operated to the descending position D2 (steps S23 and S24), the arm portion 55c of the operating shaft 55 is operated to the fourth position A4 by the elevating motor 56 (step S27).

As a result, as described above (operation of the planting clutch and the fertilizer application clutch to the transmission position by the elevating motor) while maintaining the state in which the spool 24a of the control valve 24 is operated by the wire 43 and the operation arm 44. , The planting clutch 21 and the fertilizer application clutch 22 are operated to the transmission position.

(Marker operation structure for operating the marker at the work position and storage position)
As shown in FIGS. 16 to 19, a guide plate 88 is supported on the lower side of the driver's seat 20 in the rear part of the machine body 3 on the left and right center side of the machine body with respect to the control valve 24. The right and left operating arms 89 are supported so as to be swingable in the front-rear direction independently of each other around the axis P13 in the left-right direction below the guide plate 88.

The right wire 90 (corresponding to the marker operation mechanism) is connected over the upper part of the right operation arm 89 and the arm portion 23a of the right marker 23, and the upper part of the left operation arm 89 and the arm of the left marker 23. The left wire 90 is connected to the portion 23a.

Two elongated hole-shaped openings 88a are opened in the guide plate 88 along the front-rear direction, and the operation portion 89a at the upper end of the operation arm 89 passes upward through the opening 88a of the guide plate 88. It's out. As shown in FIG. 19, the right and left springs 91 that urge the right and left markers 23 to the working position B1 are connected to the right and left markers 23.

By arranging the hydraulic cylinders 5 in the rear part of the machine body 3 below the driver's seat 20 and on the left and right center sides of the machine body, the hydraulic cylinder 5 is arranged so that the operation arm 89 and the wire 90 are adjacent to the hydraulic cylinder 5. It is located in the vicinity of. As shown in FIGS. 16 and 19, the operation unit 5a connected to the piston of the hydraulic cylinder 5 is arranged above the guide plate 88 and behind the operation unit 89a of the operation arm 89.

The state shown by the two-dot chain line in FIG. 16 is a state in which the hydraulic cylinder 5 is lowered (the piston is extended) and the seedling planting device 6 is lowered to the rice field G. In this state, the operation unit 5a of the hydraulic cylinder 5 is separated from the operation unit 89a of the operation arm 89 to the rear side, the marker 23 is operated to the work position B1 by the spring 91, and the wire 90 is pulled toward the marker 23 side. Therefore, the operation portion 89a of the operation arm 89 is located at the rear end portion of the opening 88a of the guide plate 88.

When the hydraulic cylinder 5 is lifted (the piston is contracted) and the seedling planting device 6 is lifted from the state shown by the two-point chain line in FIG. 16, the hydraulic cylinder 5 is used to lift the seedling planting device 6. Along with this, the operation unit 5a of the hydraulic cylinder 5 moves to the front side and hits the operation unit 89a of the operation arm 89, and the operation arm 89 is swung in the counterclockwise direction of FIG. As a result, the wire 90 is pulled toward the operation arm 89, and the marker 23 is operated against the spring 91 to the storage position B2.

When the hydraulic cylinder 5 is lowered (the piston is extended) and the seedling planting device 6 is lowered, the operation portion 5a of the hydraulic cylinder 5 is separated from the operation portion 89a of the operation arm 89 to the rear side. The marker 23 is operated to the working position B1 by the spring 91, the wire 90 is pulled toward the marker 23 side, and the operation portion 89a of the operation arm 89 is located at the rear end portion of the opening 88a of the guide plate 88. Return to the state.

(Marker holding structure that holds the marker in the storage position)
As shown in FIGS. 16 to 19, the support pin 92 is connected upward to the guide plate 88, and the right and left holding arms 93 can swing independently of each other around the axis P14 of the support pin 92. Is supported by.

A spring 94 is attached to the support pin 92, and the spring 94 urges the right and left holding arms 93 in a direction in which the holding portions 93a at the tips of the right and left holding arms 93 approach each other. ..

A part of the guide plate 88 is bent upward to provide a contact portion 88b, and the holding portion 93a of the holding arm 93 hits the contact portion 88b of the guide plate 88 so that the holding portion 93a of the holding arm 93 is flat. It is visually stopped at a holding position that overlaps with the opening 88a of the guide plate 88.

As described above (marker operation mechanism for operating the marker to the working position and the retracted position), the operation arm is operated by the operation unit 5a of the hydraulic cylinder 5 as the seedling planting device 6 is raised by the hydraulic cylinder 5. When the 89 is swung counterclockwise in FIG. 16, the operating portion 89a of the operating arm 89 pushes the holding portion 93a of the holding arm 93 at the holding position against the spring 94, while the operating portions 89a of FIGS. 16 and 17 Reach the position shown in.

When the operating portion 89a of the operating arm 89 reaches the position shown in FIGS. 16 and 17, the holding arm 93 returns to the holding position by the spring 94, and the holding portion 93a of the holding arm 93 becomes the operating portion 89a of the operating arm 89. When engaged, the operating arm 89 is held in the posture shown in FIGS. 16 and 17.

While the operation arm 89 is held in the posture shown in FIGS. 16 and 17 by the holding arm 93, the seedling planting device 6 is lowered by the hydraulic cylinder 5, and the operation portion 5a of the hydraulic cylinder 5 is moved to the rear side. Even if the hydraulic pressure is moved, the operation arm 89 is held by the holding arm 93 in the postures shown in FIGS. 16 and 17, and the marker 23 is held at the storage position B2.

As a result, the holding arm 93 and the spring 94 are in a state of holding the right and left markers 23 operated at the storage position B2 at the storage position B2 in preference to the operation arm 89, the wire 90, and the spring 91.

(Configuration related to marker motor that can release marker holding)
As shown in FIGS. 16, 17, and 18, an angle-shaped operation arm 96 can swing in the front-rear direction around the axis P15 in the left-right direction of the support plate 95 supported on the upper side of the guide plate 88. It is supported. The fan-shaped operation gear 96a is connected to the operation arm 96 so as to swing integrally with the operation arm 96.

The marker motor 97 and the reduction mechanism 98 are connected to the support plate 95, and the pinion gear 98a of the reduction mechanism 98 meshes with the operation gear 96a of the operation arm 96. The marker motor 97 rotationally drives the pinion gear 98a of the reduction mechanism 98 in the forward and reverse directions, and swings the operation arm 96 in the forward and reverse directions.

The operating member 99 is swingably supported around the axis P14 of the support pin 92 independently of the holding arm 93. The operation member 99 is bent into a channel shape in a side view, is formed in a bifurcated shape in a plan view, is provided with right and left operation portions 99a, and an arm portion 99b extends laterally outward.

The rear portion of the holding arm 93 extends upward to form an operating portion 93b, and the operating portion 99a of the operating member 99 is located outside the operating portion 93b of the holding arm 93. The tip of the operation arm 96 is formed in a bifurcated shape, the arm portion 99b of the operation member 99 is inserted into the bifurcated tip of the operation arm 96, and the operation arm 96 and the arm portion 99b of the operation member 99 are engaged with each other. is doing.

In addition to the operation arm 89 and the wire 90 being arranged in the vicinity of the hydraulic cylinder 5 so as to be adjacent to the hydraulic cylinder 5, the holding arm 93 and the spring 94 are supported by the guide plate 88, and the guide plate 88 is supported. The marker motor 97 is arranged on the upper side. As a result, the operation arm 89 and the wire 90, the holding arm 93 and the spring 94, and the marker motor 97 are arranged in the vicinity of the hydraulic cylinder 5.

When the operation arm 96 is swung forward by the marker motor 97 while the right and left operation arms 89 are held by the right and left holding arms 93 at the storage position B2 of the marker 23, the operation member 99 Is swung clockwise in FIG.

As a result, with the left holding arm 93 left in the holding position, the operating portion 93b of the right holding arm 93 is pushed and operated by the right operating portion 99a of the operating member 99 to hold the right holding arm 93. The right holding arm 93 is operated at a release position where the portion 93a is disengaged from the operating portion 89a of the right operating arm 89.

When the operating arm 96 is swung backward by the marker motor 97, the operating member 99 is swung counterclockwise in FIG. As a result, with the right holding arm 93 left in the holding position, the operating portion 93b of the left holding arm 93 is pushed and operated by the left operating portion 99a of the operating member 99 to hold the left holding arm 93. The left holding arm 93 is operated at a release position where the portion 93a is disengaged from the operation portion 89a of the left operation arm 89.

(Configuration related to marker motor operation)
As shown in FIGS. 17 and 19, the position sensor 111 for detecting the rotation angle of the operation arm 96 is connected to the operation arm 96, and the detection value of the position sensor 111 is input to the control device 100. The position of the operating member 99 is detected by detecting the rotation angle of the operating arm 96 by the position sensor 111.

The marker control unit 102 is provided as software in the control device 100, and is based on the operation position of the operation lever 78 (right marker position R1 and left marker position L1) and the detection value of the position sensor 111, and the marker control unit 102. The marker motor 97 is operated by (control device 100) as described below.

(Marker operation by the right marker position and left marker position of the operation lever)
As described above (the operation of raising the seedling planting device by the first ascending position of the operating lever) (the ascending operation of the seedling planting device by the second ascending position of the operating lever), the operating lever 78 is in the first ascending position. When the seedling planting device 6 is operated to ascend by being operated to the U1 or the second ascending position U2, the right and left markers 23 are described in the above-mentioned (marker holding mechanism for holding the marker in the storage position). Is operated to the storage position B2, the right and left operation arms 89 are held by the right and left holding arms 93, and the right and left markers 23 are held at the storage position B2.

Next, it is assumed that the operation lever 78 is operated to the first lowering position D1 or the second lowering position D2, and the seedling planting device 6 is lowered to the rice field surface G (the operation unit 5a of the hydraulic cylinder 5 is the operation arm 89. (A state of being separated from the operation unit 89a on the rear side). In this state, the operation arm 89 is held by the holding arm 93, and the marker 23 is held at the storage position B2.

When the operating lever 78 is operated to the right marker position R1, the operating arm 96 is swung forward by the marker motor 97 as described above (configuration relating to the marker motor capable of releasing the marker holding mechanism). The operating member 99 is swung clockwise in FIG. 17, and the right holding arm 93 is operated to the release position.

As a result, the right marker 23 is operated to the working position B1 by the spring 91, the right wire 90 is pulled toward the right marker 23, and the operation portion 89a of the right operation arm 89 is operated by the guide plate 88. It returns to the state where it is located at the rear end of the opening 88a (see the two-dot chain line in FIG. 16).

When the operating lever 78 is operated to the left marker position L1, the operating arm 96 is swung rearward by the marker motor 97 as described above (configuration relating to the marker motor capable of releasing the marker holding mechanism). , The operating member 99 is swung counterclockwise in FIG. 17, and the left holding arm 93 is operated to the release position.

As a result, the left marker 23 is operated to the working position B1 by the spring 91, the left wire 90 is pulled toward the left marker 23 side, and the operation portion 89a of the left operation arm 89 is operated by the guide plate 88. It returns to the state where it is located at the rear end of the opening 88a (see the two-dot chain line in FIG. 16).

When the operating lever 78 is operated to the right marker position R1 (left marker position L1), when the set time required for the operating portion 89a of the operating arm 89 to pass through the holding portion 93a of the holding arm 93 elapses, the marker motor 97 The operation arm 96 is returned to the position shown in FIG. 17, and the right (left) holding arm 93 is returned to the holding position.

When the operation lever 78 is operated to the right marker position R1 and then to the left marker position L1 (operated to the left marker position L1 and then to the left marker position L1) while the seedling planting device 6 is operated to descend to the rice field surface G. (When operated to the right marker position R1), the right and left markers 23 are operated to the working position B1.

Even if the operation lever 78 is operated to the right marker position R1 (left marker position L1) and the holding arm 93 is operated to the release position in the state where the seedling planting device 6 is raised, the operation unit of the hydraulic cylinder 5 is operated. Since the operating portion 89a of the operating arm 89 is held in the posture shown in FIG. 16 by 5a, the marker 23 is not operated to the working position B1.

(Structure of raising and lowering the ground leveling device)
As shown in FIG. 20, a fan-shaped operating gear 112 is swingably supported around an axial core P16 in the front-rear direction at the upper part of the front portion of the seedling planting device 6. The electric motor 113 and the speed reduction mechanism 114 are supported on the upper part of the front portion of the seedling planting device 6, and the pinion gear of the speed reduction mechanism 114 meshes with the operation gear 112. The linking rod 115 is connected to the operation gear 112, the transmission case 46, and the support arm 47.

The pinion gear of the reduction mechanism 114 is rotationally driven in the forward and reverse directions by the electric motor 113, the operation gear 112 is swung in the forward and reverse directions, and the leveling device 50 (transmission case 46 and support arm 47) is moved up and down around the axis P6. Will be done.

(Height control of leveling equipment)
As shown in FIGS. 1 and 20, a dial operation type ground leveling switch 116 is provided under the control handle 77, and an operation signal of the ground leveling switch 116 is input to the control device 100. The ground leveling switch 116 is provided with a work position and a storage position, and the set ground leveling depth of the ground leveling device 50 is arbitrarily set by the ground leveling switch 116 within the operation range of the work position.

The height sensor 117 is connected to the portion of the shaft core P16 in the operation gear 112, and the height sensor 117 detects the vertical position of the ground leveling device 50 with respect to the seedling planting device 6, and the detected value of the height sensor 117. Is input to the control device 100. A position sensor 118 for detecting the operation position of the planting depth lever 29 is provided, and the detection value of the position sensor 118 is input to the control device 100.

The leveling control unit 103 is provided in the control device 100 as software, and is electrically operated by the leveling control unit 103 (control device 100) based on the detection values of the operation position of the leveling switch 116, the height sensor 117 and the position sensor 118. The motor 113 is operated as described below.

By detecting the operation position of the planting depth lever 29 by the position sensor 118, the set height H1 (set planting depth of seedlings) (described above (change of set planting depth of seedlings)) and FIG. 19 See) is detected. The height of the leveling device 50 from the field surface G based on the set height H1 (set planting depth of seedlings) and the detected value of the height sensor 117 (upper and lower positions of the leveling device 50 with respect to the seedling planting device 6). Is detected, and the leveling depth H2 of the leveling device 50 is detected.

As a result, the electric motor 113 is operated so that the leveling depth H2 of the leveling device 50 becomes the set leveling depth of the leveling switch 116, and the leveling device 50 is moved up and down. When the set leveling depth of the leveling switch 116 is changed, the electric motor 113 operates so that the leveling depth H2 of the leveling device 50 becomes the set leveling depth of the changed leveling switch 116, and the leveling device 50 Is raised and lowered.

Even if the set height H1 (set planting depth of seedlings) is changed, the detection value of the position sensor 118 (changed set height H1 (set planting depth of seedlings)) and the height sensor 117 Based on the detected value, the leveling depth H2 of the leveling device 50 is detected, and the electric motor 113 operates so that the leveling depth H2 of the leveling device 50 becomes the set leveling depth of the leveling switch 116, and the leveling is performed. The device 50 is moved up and down.

When the ground leveling switch 116 is operated to the retracted position, the electric motor 113 raises the ground leveling device 50 to the upper limit position. The upper limit position of the ground leveling device 50 is a position where the ground leveling device 50 is largely operated to rise from the field surface G and the ground leveling device 50 does not touch the ground surface G.

(Swirl and planting at the ridge)
As shown in FIG. 21, in the passenger-type rice transplanter, when one planting process K1 is completed and the machine 3 reaches the ridge F, the operator operates the operation lever 78 to plant seedlings. The attachment device 6 is operated ascending from the rice field surface G (the planting clutch 21 and the fertilizer application clutch 22 are in the cutoff position), and the control handle 77 is operated to make a turning J1 at the ridge.

When the turning J1 is completed, the operator operates the operation lever 78 to lower the seedling planting device 6 to the field surface G, and operates the planting clutch 21 and the fertilizer application clutch 22 to the transmission position to perform the next planting. Enter the incidental process K2.

In this case, the end position K11 of the previous planting process K1 (the position of the seedling planting device 6 in which the planting clutch 21 and the fertilizer application clutch 22 are operated to the cutoff position) and the start position K21 of the next planting process K2 ( It is necessary to match the position of the seedling planting device 6 in which the planting clutch 21 and the fertilizer application clutch 22 are operated to the transmission position).

(Planting control unit)
As shown in FIGS. 20 and 21, the planting alignment control unit 104 is provided in the control device 100 as software. A rotation speed sensor 120 for detecting the rotation speed of the rear wheel 2 is provided, and the detection value of the rotation speed sensor 120 is input to the control device 100. A dial-operated type planting alignment switch 119 is provided in the vicinity of the control handle 77, and an operation signal of the planting alignment switch 119 is input to the control device 100.

As described in the above (turning at the ridge and alignment of plants), when the passenger-type rice transplanter makes a turning J1 at the ridge, the detection value of the rotation speed sensor 120 and the steering angle of the front wheel 1 are used. Based on this, the planting alignment control unit 104 detects the position of the machine body 3 (seedling planting device 6) at the coordinates along the planting process K1 with the end position K11 as the origin, and the direction along the planting process K1. Is the reference direction, and the angle of the aircraft 3 with respect to the reference direction is detected.

When the turning J1 is started from the end position K11, the position of the machine body 3 (seedling planting device 6) moves away from the origin (end position K11) toward the ridge F side, and the angle of the machine body 3 with respect to the reference direction. It gradually increases from 0 degrees.

When the angle of the above-mentioned machine 3 becomes 90 degrees, the position of the machine 3 (seedling planting device 6) stops, and as the turning J1 progresses, the angle of the machine 3 approaches from 90 degrees to 180 degrees. , The position of the machine body 3 (seedling planting device 6) at the coordinates along the planting process K1 approaches the origin (end position K11).

As a result, the angle of the machine 3 becomes 180 degrees, and if the position of the machine 3 (seedling planting device 6) at the coordinates along the planting process K1 is located at the origin (end position K11), it becomes the end position K11. It can be determined that the start position K21 and the start position K21 match.

In the state where the planting alignment switch 119 is operated to the working position, the elevating motor 56 is as described below so that the planting alignment control unit 104 (control device 100) coincides with the end position K11 and the start position K21. Be manipulated.

When the operator operates the operation lever 78 to raise the seedling planting device 6 from the field surface G, the planting alignment control unit 104 sets the end position K11 when the operation lever 78 is operated and plants the seedlings. The direction along the step K1 is set as the reference direction. With the end position K11 as the origin, the detection of the position of the machine 3 (seedling planting device 6) at the coordinates along the planting process K1 and the detection of the angle of the machine 3 with respect to the reference direction are started.

The angle of the machine 3 reaches between 90 degrees and 180 degrees, and the position of the machine 3 (seedling planting device 6) at the coordinates along the planting process K1 is slightly on the ridge F side from the origin (end position K11). When it reaches, the planting alignment control unit 104 determines that it has entered the latter half of the turning J1, and gives priority to the elevating control unit 101 to use the elevating motor 56 to move the operation unit 55b and the arm unit 55c of the operation shaft 55 to the third position. By operating the position A3, the seedling planting device 6 is lowered to the rice field surface G (see the above-mentioned (lowering operation of the seedling planting device by the second lowering position of the operation lever)).

Next, when the angle of the machine 3 becomes 180 degrees and the position of the machine 3 (seedling planting device 6) at the coordinates along the planting process K1 reaches the origin (end position K11), the planting alignment control unit 104 moves. In preference to the elevating control unit 101, the elevating motor 56 operates the operation unit 55b and the arm unit 55c of the operation shaft 55 to the fourth position A4 to operate the planting clutch 21 and the fertilizer application clutch 22 to the transmission position. (Refer to the above-mentioned (operation of the planting clutch and the fertilizer application clutch to the transmission position by the second lowering position of the operation lever)).

In the operating range of the working position of the planting alignment switch 119, the timing at which the operation portion 55b and the arm portion 55c of the operation shaft 55 are operated to the fourth position A4 by operating the planting alignment switch 119 is set to the planting process K1. The position of the machine body 3 (seedling planting device 6) at the coordinates along the line can be set slightly before (early) or slightly after (late) the origin (end position K11).

As a result, when the end position K11 and the start position K21 do not match well in the operating state of the planting alignment control unit 104, the operator operates the planting alignment switch 119 as described above to operate the planting alignment switch 119 to form the end position K11 and the start position. It can be matched with K21.

When the planting alignment switch 119 is operated to the stop position, the planting alignment control unit 104 is stopped. Therefore, the operator operates the operation lever 78 so that the end position K11 and the start position K21 match. The seedling planting device 6 is operated to descend to the rice field surface G, and the planting clutch 21 and the fertilizer application clutch 22 are operated to the transmission positions.

(First Different Form of Implementation of the Invention)
The flexible portion 67 provided in the first work linking mechanism 61 may be configured as described below.

As shown in FIGS. 25, 26, and 27, the support shaft 74 is connected to the lower side of the control valve 24 and the elevating motor 56 over the right and left airframe frames 60. At the end of the support shaft 74 on the right outer side of the right airframe frame 60, the first swing portion 64 and the second swing portion 121 can swing independently of each other around the axis P9 in the left-right direction. It is supported.

A rod-shaped first linking portion 63 is connected to the arm portion 55c of the operating shaft 55 and the swinging portion 64. By rotating the operation shaft 55 by the elevating motor 56, the swing portion 64 moves in conjunction with the operation portion 55b and the arm portion 55c of the operation shaft 55 in the first position A1, the fourth position A4, and the second position. It is operated to A2 and the third position A3 (see the above-mentioned (configuration relating to the control valve and the elevating motor for elevating operation of the seedling planting device)).

A pin-shaped operation portion 64d is connected to the swing portion 64, an arc-shaped elongated hole 121a centered on the shaft core P9 is opened in the swing portion 121, and the operation portion 64d of the swing portion 64 is opened. It is inserted into the elongated hole 121a of the swing portion 121.

As a result, the accommodation portion 67 provided with the operation portion 64d of the swing portion 64 and the elongated hole 121a of the swing portion 121 is provided over the first swing portion 64 and the second swing portion 121. It is provided in the first work linkage mechanism 61.

The rod-shaped second linking portion 65 is connected to the swinging portion 121 and enters between the right and left airframe frames 60 through the elongated hole 60a of the airframe frame 60. The linking portion 65 extends to the front side and is connected to the operating member 69 and the linking member 70 (see the above-mentioned (operating member for operating the planting clutch)). In this case, the length adjusting unit 66 is not provided.

As shown in FIG. 25, when the swing portion 64 is operated to the first position A1 by the elevating motor 56, the operation portion 64d of the swing portion 64 is positioned at the upper end portion of the elongated hole 121a of the swing portion 121. The planting clutch 21 and the fertilizer application clutch 22 are operated at the cutoff position.

Even if the arm portion 55c and the swing portion 64 of the operation shaft 55 are operated to the second position A2 and the third position A3 by the elevating motor 56, the operation portion 64d of the swing portion 64 is a long hole of the swing portion 121. Only by moving along 121a, the swinging portion 121 is not swinging, and the planting clutch 21 and the fertilizer application clutch 22 are maintained at the cutoff position.

As shown in FIGS. 25 to 26, when the swing portion 64 is operated to the fourth position A4 by the elevating motor 56, the operation portion 64d of the swing portion 64 is moved to the upper end portion of the elongated hole 121a of the swing portion 121. When it reaches, the swinging portion 64 and the swinging portion 121 are integrally swung in the counterclockwise direction of FIG. 26, and the linking portion 65 is pulled to the rear side.
As a result, the planting clutch 21 and the fertilizer application clutch 22 are operated to the transmission position (see the above-mentioned (operation of the planting clutch and the fertilizer application clutch to the transmission position by the elevating motor)).

(Second alternative form of carrying out the invention)
In a state where the engine 34 is stopped, the operating lever 78 is operated to, for example, the second descending position D2, is operated to the neutral position N, and then is operated to the second descending position D2 again. Is operated in a specific direction, the elevating control unit 101 (control device 100) operates the elevating motor 56, the arm portion 55c of the operation shaft 55 is operated to the fourth position A4, and the planting clutch 21 and The fertilizer application clutch 22 may be operated to the transmission position.

The planting clutch 21 that operates and stops the seedling planting device 6 is generally provided with a fixed-position stop function. The fixed position stop function of the planting clutch 21 is such that both of the two sets of planting arms 11 of the rotating case 10 are located above the rice field G (for example, one planting arm 11 is used to plant seedlings on the rice field G). This is a function of stopping and fixing the rotary case 10 at the state just before the seedlings are taken out from the lower part of the seedling stand 13 by the other planting arm 11 after finishing the above.

As a result, when the operator manually rotates the rotating case 10 while the engine 34 is stopped and performs maintenance work such as confirmation of the amount of seedlings taken out by the planting arm 11, the planting clutch 21 is cut off. When the above-mentioned fixed-position stop function is activated by being operated to a position, it becomes difficult to manually rotate the rotating case 10.

Therefore, if the planting clutch 21 can be operated to the transmission position as described above with the engine 34 stopped, the fixed-position stop function does not work, and the operator manually rotates the rotary case 10. This can be done reasonably, and various maintenance work can be easily performed.

(Third alternative form of carrying out the invention)
When the engine 34 is stopped while the operating lever 78 is operated to the neutral position N, the elevating control unit 101 (control device 100) operates the elevating motor 56 to operate the arm portion of the operating shaft 55. 55c may be operated to the second position A2, and the spool 24a of the control valve 24 may be pushed to the neutral stop position in preference to the wire 43 and the operation arm 44.

When the engine 34 is stopped while the operation lever 78 is held at the first lowering position D1 or the second lowering position D2, the operation by the elevating control unit 101 (control device 100) as described above is performed. It may be configured not to.

(Fourth Different Embodiment of the Invention)
As shown in FIG. 1, an arch-shaped operation arm 122 may be provided at the front end portion of the machine body 3 in a front view, and the operation arm 122 is extended to the front side from the standing posture and the machine body 3 shown in FIG. It is supported so that the posture can be changed according to the usage posture.

In normal planting work, the operation arm 122 is operated in an upright posture. When a passenger-type rice transplanter enters or leaves a paddy field beyond the ridge F, the worker standing in front of the machine 3 holds the operation arm 122 in the usage posture to lift the front part of the machine 3. You can hold it down or correct the orientation of the aircraft 3.

In the operation arm 122 as described above, a tact switch type engine stop switch (not shown) may be provided on the upper part of the operation arm 122.
As a result, when the worker standing in front of the machine 3 holds the operation arm 122 in the usage posture, the engine 34 is stopped by the worker operating the engine stop switch, and at the same time, the buzzer or the like is operated. An alarm sounds.

(Fifth alternative form of carrying out the invention)
The angle sensor 79 is abolished, and the upper limit position switch (not shown) (corresponding to the upper limit position detection unit) that detects that the link mechanism 4 has reached the upper limit position and the link mechanism 4 have reached the lower limit position. A lower limit position switch (not shown) (corresponding to the lower limit position detection unit) for detection may be provided separately.

The present invention is not limited to a passenger-type rice transplanter, but also a passenger-type direct sowing machine equipped with a seeding device (corresponding to a working device) (not shown) for supplying seeds to the rice transplanter G, and a supply device for supplying chemicals to the rice transplanter G. It can also be applied to a passenger-type spreader equipped with (corresponding to a working device) (not shown).

3 Aircraft 5 Hydraulic cylinder 6 Seedling planting device (working device)
12 float 24 control valve
24a spool
34 Engine 43 Wire (elevation linkage mechanism)
44 Operation arm (elevation linkage mechanism)
44a operation unit
55b operation unit
56 Lifting motor (lifting actuator)
78 Operation lever (operation tool)
79 Angle sensor (upper limit position detection unit) (lower limit position detection unit)
101 Elevating control unit G Field surface H1 Set height N Neutral position U1 1st ascending position U2 2nd ascending position
D1 1st descending position D2 2nd descending position

Claims (6)

A work device that is supported by the machine so that it can be raised and lowered, and a hydraulic cylinder that raises and lowers the work device.
A control valve that operates the hydraulic cylinder by supplying and discharging hydraulic oil to the hydraulic cylinder.
A float that is supported by the work equipment so that it can be raised and lowered and follows the ground surface.
Provided over the control valve and the float, the height of the working device with respect to the float is mechanically transmitted to the control valve, and the control valve is operated to move the working device from the field surface to a set height. Equipped with an elevating linkage mechanism to maintain,
An elevating actuator that can operate the control valve and
An artificially operable operation tool and
An elevating control unit that operates the elevating actuator based on the operation of the operating tool is provided.
The elevating actuator and the elevating linkage mechanism can operate the control valve separately from each other.
The elevating control unit
When the actuator is operated to the first ascending position, the control valve is operated to the ascending operating position in preference to the elevating and lowering linkage mechanism without going through the elevating and lowering linkage mechanism, and the actuator is operated to the neutral position. Then, the elevating actuator is operated so that the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism without going through the elevating linkage mechanism.
When the operating tool is operated to the second ascending position, the elevating actuator is operated and maintained at the ascending operating position in preference to the elevating and lowering linkage mechanism without going through the elevating and lowering linkage mechanism. Paddy field working machine to operate. The elevating control unit
When the actuator is operated to the first lowering position, the control valve is operated by the elevating linkage mechanism, and when the actuator is operated to the neutral position, the elevating linkage mechanism is not used. The elevating actuator is operated so that the control valve is operated to the neutral stop position in preference to the mechanism.
The paddy field working machine according to claim 1 , wherein when the operating tool is operated to the second lowering position, the elevating actuator is operated so that the control valve is maintained in a state of being operated by the elevating linkage mechanism. An upper limit position detection unit for detecting that the work device has risen is provided at the upper limit position of the elevating range of the work device.
The elevating control unit
When it is detected by the upper limit position detection unit that the work apparatus has risen to the upper limit position, the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism without going through the elevating linkage mechanism. The paddy field working machine according to claim 1 or 2 , which operates the elevating actuator. A lower limit position detecting unit for detecting that the working device has descended is provided at the lower limit position of the ascending / descending range of the working device.
The elevating control unit
When the lower limit position detection unit detects that the working device has descended to the lower limit position, the control valve is operated to the neutral stop position in preference to the elevating / lowering linkage mechanism without going through the elevating / lowering linkage mechanism. The paddy field working machine according to claim 3 , which operates the elevating actuator. The elevating control unit
Claims 1 to 4 for operating the elevating actuator so that when the engine stop operation is performed, the control valve is operated to the neutral stop position in preference to the elevating linkage mechanism without going through the elevating linkage mechanism. The paddy field working machine described in any one of the items. The operation unit operated by the elevating actuator and the operation unit operated by the elevating linkage mechanism are arranged so as to face the end of the spool of the control valve.
The operation unit operated by the elevating actuator and the operation unit operated by the elevating linkage mechanism can operate the spool of the control valve separately from each other according to any one of claims 1 to 5. The listed paddy work machine.

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