JP2020115748A - Rice field implement - Google Patents

Abstract

To provide a rice field implement capable of improving operability of a control valve and operability of a work clutch.SOLUTION: A rice field implement comprises: an actuator capable of operating a control valve 24; a work linkage mechanism 61 being provided over the actuator and a work clutch 21; and a controller for actuating the actuator so that the control valve 24 is operated on the basis of an operation of an operation tool which can be artificially operated, and the work clutch 21 is operated to a transmission position or a block position through the work linkage mechanism 61. The work linkage mechanism 61 comprises flexible parts 63a, 64a by which, actuation for operating the control valve 24 to a raised actuation position prior to lifting linkage mechanisms 43, 44 on the actuator, and actuation for maintaining the control valve 24 in an operated state by the lifting linkage mechanisms 43, 44 on the actuator are not transmitted to a work clutch 21, and by which actuation for operating the work clutch 21 on the actuator to the transmission position is transmitted to the work clutch 21.SELECTED DRAWING: Figure 8

Description

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

In a riding-type rice transplanter, which is an example of a paddy field working machine, as disclosed in Patent Document 1, a seedling planting device is supported by a machine body so as to be able to move up and down, and a hydraulic cylinder for operating the seedling planting device up and down. 2. Description of the Related Art Some hydraulic cylinders are provided with a mechanical operation type control valve for supplying and discharging hydraulic oil, and an artificially operated lift control lever.

When the control valve is operated by the raising/lowering operation lever, the hydraulic linder operates to raise/lower the seedling planting device.
The seedling planting device is provided with a planting clutch capable of transmitting and shutting off power, and the raising and lowering operation lever operates the planting clutch to the transmission position and the shut-off position to activate and stop the seedling planting device.

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

JP, 2008-237062, A

In Patent Document 1, when a worker operates the elevating operation lever, the elevating operation lever operates the control valve, and the elevating operation lever operates the work clutch. In this case, since the operation stroke of the elevating operation lever is large, there is room for improvement in terms of operability.

It is an object of the present invention to improve the operability of a control valve in a paddy work machine and to improve the operability of a work clutch capable of transmitting and disconnecting power to and from a work device.

The paddy work machine of the present invention includes a work device supported by a machine body so as to be able to move up and down, a work clutch capable of transmitting and disconnecting power to and from the work device, a hydraulic cylinder for vertically moving the work device, and a hydraulic cylinder. A control valve for operating and supplying hydraulic oil to operate the hydraulic cylinder, and an elevating and lowering linkage mechanism for operating the control valve to maintain the working device at a set height from a field are provided. An actuator that can be operated, a work linking mechanism provided between the actuator and the work clutch, an operation tool that can be operated manually, and the control valve is operated based on the operation of the operation tool. A control unit that operates the actuator so that the work clutch is operated to the transmission position or the disengagement position via the work linkage mechanism, and the work linkage mechanism includes the lifting linkage in the actuator. The operation of operating the control valve in a raised operating position in preference to the mechanism, and the operation of maintaining the control valve in the actuator operated state by the elevator linkage mechanism are prevented from being transmitted to the work clutch, Further, there is provided a flexible portion for transmitting an operation of operating the working clutch in the actuator to a transmission position to the working clutch.

According to the present invention, the control valve is operated by the actuator based on the operation of the operation tool, and the work clutch is operated by the actuator via the work linkage mechanism.
As a result, even if the operation stroke of the operation tool is set to a small value, the control valve and the work clutch are operated smoothly by the operation of the actuator, and the operation resistance of the control valve and the operation clutch are not applied to the operation tool. Therefore, the operability of the control valve by the operation tool and the operability of the work clutch are improved.

According to the present invention, based on the operation of the operation tool, the operation of the actuator causes the control valve to be operated to the ascending operation position in preference to the ascending/descending linkage mechanism, so that the working device is operated to ascend.
When the control device is operated by the elevating and lowering mechanism while the work device is elevated from the rice field, the elevating and lowering mechanism operates the control valve to the lowering operation position and lowers the work device. As a result, when the working device is raised from the rice field and the control valve is operated by the elevating and lowering linkage mechanism by the operation of the actuator based on the operation of the operation tool, the control valve is moved to the lowered operating position. Operated.

In the above-described state, according to the present invention, when the control valve is operated to the raising operation position by the operation of the actuator in preference to the elevator linkage mechanism, and the state in which the control valve is operated by the elevator linkage mechanism is set. If the actuator is engaged, the operation of the actuator is absorbed by the interchanged portion and is not transmitted to the work clutch.
When the work clutch is operated to the transmission position by the actuator, the operation to operate the work clutch in the actuator to the transmission position is transmitted to the work clutch via the work linkage mechanism and the interchange part, and the work clutch is comfortably moved to the transmission position. Is operated.
As a result, according to the present invention, the reliability of the operation of the control valve and the work clutch due to the operation of the actuator is improved.

In the present invention, the work linking mechanism includes a first linking part connected to the actuator and transmitting an operation of the actuator, and a first linking part connected to the work linking mechanism in association with the first linking part. An oscillating part that oscillates and a second linking part that is connected across the oscillating part and the work clutch are provided, and the interchange part includes the first linking part and the oscillating part. It is preferable that it is provided in at least one of the connection portion of the second connection portion and the connection portion of the second linkage portion and the swing portion.

According to the present invention, the work linkage mechanism is provided with the first linkage portion, the second linkage portion, and the swing portion, and in the swing portion, the operation direction of the first linkage portion and the second linkage portion are provided. It is possible to easily set the operating direction of the linking portion to be different.

As a result, the work linkage mechanism can be bent and arranged instead of being linear. Therefore, the work linkage mechanism should be provided across the actuator and the work clutch while avoiding obstacles and the like between the actuator and the work clutch. Will be easier.
In the work link mechanism, the interchange part is provided in at least one of a connection part between the first link part and the swing part and a connection part between the second link part and the swing part. Since it is provided at the bending point, the interchange portion can be arranged without difficulty.

In the present invention, in the interchangeable section, an operating section provided on one of the linking section and the swinging section, and a long hole provided on the other of the linking section and the swinging section for inserting the operating section And are preferably provided.

According to the present invention, since the operating portion and the elongated hole are provided in the interchangeable portion, the interchangeable portion is simply configured, which is advantageous in terms of simplification of the structure.

In the present invention, the work linking mechanism includes a first linking part connected to the actuator and transmitting an operation of the actuator, and a first linking part connected to the work linking mechanism in association with the first linking part. A swinging first swinging portion, a swingable second swinging portion, and a second linking portion connected across the second swinging portion and the work clutch are provided. It is preferable that the interchangeable portion is provided over the first swinging portion and the second swinging portion.

According to the present invention, the work linkage mechanism is provided with the first linkage portion and the first swing portion, and the second swing portion and the second linkage portion. In the second swing part, it is possible to easily set the operating direction of the first linking part and the operating direction of the second linking part to be different from each other.

As a result, the work linkage mechanism can be bent and arranged instead of being linear. Therefore, the work linkage mechanism should be provided across the actuator and the work clutch while avoiding obstacles and the like between the actuator and the work clutch. Will be easier.
In the work link mechanism, the interchange part is provided over the first swing part and the second swing part, and is provided at the bending point of the work link mechanism, so that the interchange part is arranged without difficulty. ..

In the present invention, in the interchangeable section, an operation section provided on one of the first swing section and the second swing section, and the first swing section and the second swing section are provided. It is preferable that an elongated hole provided on the other side and into which the operation portion is inserted is provided.

According to the present invention, since the operating portion and the elongated hole are provided in the interchangeable portion, the interchangeable portion is simply configured, which is advantageous in terms of simplification of the structure.

In the present invention, it is preferable that a length adjustment unit that can adjust a length from the actuator of the work linkage mechanism to the work clutch is provided.

According to the present invention, the length of the work linkage mechanism can be adjusted by the length adjusting portion so that the operating position of the actuator and the transmission position of the work clutch accurately correspond (match). Similarly, the length adjusting section can adjust the length of the work linking mechanism so that the actuating position of the actuator and the disengaging position of the work clutch correspond to each other with high precision.

This allows the working position of the actuator and the transmission position of the work clutch, and the working position of the actuator and the disengagement position of the work clutch to be accurately matched (matched), and the work clutch can be operated accurately by the actuator. As a result, the accuracy of work by the actuator is improved.

In the present invention, the work linking mechanism includes a first linking part connected to the actuator and transmitting an operation of the actuator, and a first linking part connected to the work linking mechanism in association with the first linking part. An oscillating part that oscillates and a second linking part that is connected across the oscillating part and the work clutch are provided, and the length adjusting part includes the first linking part and the oscillating part. It is preferable that it is provided in at least one of a connecting portion with the portion and a connecting portion with the second linking portion and the swinging portion.

According to the present invention, the work linkage mechanism is provided with the first linkage portion, the second linkage portion, and the swing portion, and in the swing portion, the operation direction of the first linkage portion and the second linkage portion are provided. It is possible to easily set the operating direction of the linking portion to be different.

As a result, the work linkage mechanism can be bent and arranged instead of being linear. Therefore, the work linkage mechanism should be provided across the actuator and the work clutch while avoiding obstacles and the like between the actuator and the work clutch. Will be easier.
In the work linkage mechanism, the length adjusting portion is provided in at least one of the connection portion between the first linkage portion and the swing portion and the connection portion between the second linkage portion and the swing portion, Since it is provided at the bending point of the work linking mechanism, the length adjusting portion is arranged without difficulty.

In the present invention, right and left body frames are provided, the work clutch is disposed between the right and left body frames in a plan view, and the length adjusting unit and the swinging unit are in a plan view. The second linkage portion is disposed on the right outer side of the right machine body frame or the left outer side of the left machine body frame, and the second linking portion passes through an opening formed in the body frame from the swinging portion to perform the work. It preferably extends to the clutch.

In some paddy working machines, right and left machine frames are provided, and a work clutch is arranged between the right and left machine frames in a plan view.
According to the present invention, in the above-mentioned configuration, the length adjusting portion and the swinging portion are arranged on the right outer side of the right machine body frame or on the left outer side of the left machine body frame in a plan view, so that the operator operates the right ( From the right outer side (left outer side) of the left body frame, the length adjusting section can be operated without being affected by the body frame, and the workability of the length adjusting section is improved.

According to the present invention, since the second linking portion extends from the swinging portion through the opening of the machine body frame to the work clutch, the length adjusting portion and the swinging portion are located on the right side in plan view. Even if the work clutch is arranged on the right outer side of the machine body frame or on the left outer side of the left machine body frame, the work clutch is operated without difficulty.

In the present invention, it is preferable that the length adjusting unit can change a connection position of the swinging unit in the linking unit along a moving direction of the linking unit.

According to the present invention, in the length adjusting part, the length of the work linking mechanism can be adjusted by changing the connection position of the swing part in the linking part along the moving direction of the linking part. The operability of the adjusting unit is improved.

In the present invention, the length adjusting unit includes an adjusting unit swingably supported by the swinging unit and connected to the linking unit, and a swinging range of the adjusting unit in the swinging unit. It is preferable that a connecting portion that can connect the adjusting portion to the swinging portion is provided at an arbitrary position.

According to the present invention, in the length adjusting part, the adjusting part is swung to connect the adjusting part to a desired position of the swinging part, so that the connecting position of the swinging part in the linking part is moved in the moving direction of the linking part. Since it can be changed along with, the operability of the length adjusting section becomes good.

In the present invention, it is preferable that the adjusting portion is supported by the swinging portion so as to swing in a direction intersecting a moving direction of the linking portion.

According to the present invention, in the length adjusting part, when the adjusting part is oscillated in a direction intersecting the moving direction of the linking part, the displacement of the adjusting part in the direction along the moving direction of the linking part is small. Therefore, the length of the work linking mechanism can be finely adjusted, and the operability of the length adjusting unit is improved.

In the present invention, it is preferable that the work linkage mechanism is pulled to the actuator side by the actuator and the work clutch is operated to the transmission position.

If the work linkage mechanism is pushed to the work clutch side by the actuator and the work clutch is operated to the transmission position, the work linkage mechanism is compressed due to the relatively large operation resistance of the work clutch to the transmission position. It is considered that the work clutch may be slightly buckled and elastically deformed a little, so that the operation of the work clutch to the transmission position may not be performed accurately.

According to the present invention, the work linking mechanism is not buckled by being compressed due to the work linking mechanism being pulled toward the actuator by the actuator. Therefore, the work clutch is operated to the transmission position. Is performed accurately.

In the present invention, the first working device, the first working clutch capable of transmitting and disconnecting power to the first working device, the second working device, and the second working device are powered. A second work clutch capable of transmitting and disconnecting, the interchange part provided, and the first work linkage mechanism provided across the actuator and the first work clutch; And a second work linking mechanism provided over the second work clutch, the first work clutch being operated to the transmission position or the disengagement position. It is preferable that the second work clutch is operated to the transmission position or the disengagement position via the second work linkage mechanism.

In a riding-type rice transplanter, which is an example of a paddy field working machine, for example, a seedling planting device and a planting clutch are provided as the first working device and the first working clutch, and the second working device and the second working clutch are provided. In some cases, a fertilizer application device and a fertilizer application clutch are provided, and the planting clutch and the fertilizer application clutch are operated to the transmission position at substantially the same time and to the shut-off position at substantially the same time.

According to the present invention, when the operation tool is operated in the above-mentioned configuration, the first work clutch is operated to the transmission position via the first work biasing mechanism by the operation of the actuator, and the second work biasing is performed. The second working clutch is operated to the transmission position via the mechanism.
Similarly, when the operation tool is operated, the first work clutch is operated to the disengaged position via the first work biasing mechanism and the second work biasing mechanism is operated via the second work biasing mechanism. The work clutch is operated to the disengaged position.

As described above, according to the present invention, since the first and second work linking mechanisms are arranged in series, the actuator and the first and second work clutches are arranged separately from each other, and Even if the work link mechanism is long, the second work link mechanism is short if the first and second work clutches are arranged close to each other.

As a result, the first work linkage mechanism is provided between the actuator and the first work clutch, and the second work linkage mechanism is provided between the actuator and the second work clutch. Further, it is advantageous in terms of simplification of the structure as compared with the case where the second work linking mechanism is provided in parallel.

According to the present invention, since the interchangeable portion is provided in the first work linkage mechanism, the interchangeable portion functions with respect to the first and second work clutches, and the interchangeable portion includes the first and second work clutches. Since it is shared with the work clutch, it is advantageous in terms of simplification of the structure.

In the present invention, the first work linkage mechanism is pulled to the actuator side by the actuator, the first work clutch is operated to the transmission position, and the first work clutch is operated to the transmission position. Accordingly, it is preferable that the second work linkage mechanism is pulled to the first work linkage mechanism side and the second work clutch is operated to the transmission position.

When the actuator is configured to push the first and second work linkage mechanisms toward the first and second work clutches to operate the first and second work clutches to the transmission position, It is conceivable that the relatively large operation resistance of the second and second work clutches to the transmission position causes the first and second work linkage mechanisms to be slightly buckled due to compression and elastically deformed. The operation of the first and second work clutches to the transmission position may not be performed accurately.

According to the present invention, the first and second work linkage mechanisms are pulled by the actuator toward the actuator, so that the first and second work linkage mechanisms are compressed and buckled. Therefore, the operation of the first and second work clutches to the transmission position is accurately performed.

In the present invention, the control unit operates the work clutch to a disengagement position when the operation tool is operated to a raised position, and operates the control valve to a raised actuation position in preference to the lifting linkage mechanism. Advantageously, the actuator is actuated such that it is maintained and maintained.

According to the present invention, when the operation valve is operated to the raised position while the work device is maintained at the set height from the field surface by operating the control valve by the elevating and lowering mechanism, the work clutch is actuated by the operation of the actuator. The control valve is operated to the shut-off position, the control valve is operated to the raising actuation position in preference to the raising and lowering linkage mechanism, and the working device is raised.
Even if the operating tool is not maintained in the raised position after being operated in the raised position, the work clutch is maintained in the disengaged position and the control valve is maintained in the raised operation position based on the operation of the actuator. The ascending operation is continued, and the operability of the control valve and the work clutch by the operating tool are improved.

In the present invention, a work urging mechanism that urges the work clutch to the disengagement position is provided, and the control unit causes the work clutch to be operated by the work urging mechanism when the operation tool is operated to the raised position. It is preferable that the actuator is operated so that the actuator is operated to a shut-off position, and the control valve is operated and maintained at the ascending operation position in preference to the elevating and lowering mechanism.

According to the present invention, the work clutch is urged to the disengaged position by the work urging mechanism to be operated. Stable and maintained.

In the present invention, when the operation tool is operated to the down position, the control section is maintained in a state in which the work clutch is operated to the disengagement position and the control valve is operated by the elevating and lowering linkage mechanism. Thus, it is preferable to activate the actuator.

According to the present invention, when the operation tool is operated to the lowered position, the work clutch is operated to the disengaged position by the operation of the actuator, and the control valve is operated to be operated by the elevating and lowering mechanism.

When the control device is operated by the elevating and lowering mechanism while the work device is elevated from the rice field, the elevating and lowering mechanism operates the control valve to the lowering operation position and lowers the work device.
Even if the operating tool is not maintained in the lowered position after being operated in the lowered position, the work clutch is maintained in the disengaged position by the operation of the actuator, and the state in which the control valve is operated by the elevator linkage mechanism is maintained. Then, the descending operation of the work device is continued, and the operability of the control valve and the work clutch by the operation tool are improved.

When the work device descends and reaches the position of the set height from the rice field, the elevator linkage mechanism operates the control valve to the neutral stop position to stop the descending operation of the work device. After that, the control valve is operated by the elevating and lowering mechanism, and the working device is maintained at the set height from the rice field.

In the present invention, a work urging mechanism for urging the work clutch to the disengagement position is provided, and the control unit causes the work clutch to be operated by the work urging mechanism when the operation tool is operated to the lower position. It is preferable that the actuator is operated so that the actuator is operated to a shutoff position and the control valve is maintained to be operated by the elevating and lowering mechanism.

According to the present invention, the work clutch is urged to the disengaged position by the work urging mechanism so that the work clutch can be moved to the disengaged position even if the operation tool is not maintained at the descended position after being operated to the descended position. Stable and maintained.

In the present invention, when the operating tool is operated to the descending position and then to the descending position again, the control unit maintains the state in which the control valve is operated by the elevating and lowering linkage mechanism while maintaining the working clutch. Preferably, the actuator is actuated such that is operated in the transmission position.

According to the present invention, when the operating tool is operated to the lowered position and then to the lowered position again, the operation of the actuator causes the work clutch to be transmitted while maintaining the state in which the control valve is operated by the elevator linkage mechanism. Since it is operated to the position, the work by the work device is started, and the operability of the control valve and the work clutch by the operating tool are improved.

In the present invention, a work urging mechanism for urging the work clutch to the disengagement position is provided, and the control unit moves the lifting/lowering unit when the operating tool is operated to the lowering position and then to the lowering position. It is preferable to operate the actuator such that the work linkage mechanism operates the work clutch to a transmission position against the work biasing mechanism while maintaining a state where the control valve is operated by the linkage mechanism. Is.

According to the present invention, when the operating tool is operated to the lowered position and then to the lowered position again, the work clutch is stably operated to the transmission position by the actuator against the work urging mechanism.

In the present invention, a float which is supported by the working device so as to be able to move up and down, and which follows the ground contact with a rice field, is provided over the control valve and the float, and the height of the working device with respect to the float is controlled by the control valve. It is preferable that the lifting and lowering linkage mechanism is provided to maintain the working device at the set height from the rice field by transmitting the control signal to the control valve.

According to the present invention, the height of the working device with respect to the float is mechanically transmitted to the control valve by the lifting and lowering linkage mechanism when the float follows the ground contact with the paddy field, and the control valve is operated to set the working device from the paddy field. Maintained at height.

Since the float is descending with respect to the work device when the work device is raised from the paddy field, when the control valve is operated by the elevating linkage mechanism, the control valve is operated to the descent operation position by the elevating linkage mechanism. The working device is lowered.

When the work equipment descends and the float touches the rice field, the float rises with respect to the work equipment.When the work equipment reaches the set height position from the rice field, the elevator linkage mechanism causes the control valve to move to the neutral stop position. And the lowering operation of the work device is stopped.
After that, the height of the work device with respect to the float is mechanically transmitted to the control valve by the lifting and lowering linkage mechanism, and the control valve is operated to maintain the work device at the set height from the paddy field.

According to the present invention, when the control valve is operated by the elevator linkage mechanism, the float that follows the ground contact with the paddy field and the control valve that is operated by the elevator linkage mechanism are highly reliable and reliable. Will be things.

It is a left side view of a riding type rice transplanter. It is a cross-sectional top view of a seedling planting apparatus. It is a left side view near the float. FIG. 4 is a right side view in the vicinity of a lifting motor, a control valve, and a first work linkage mechanism. It is a right side view near 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, etc. FIG. 3 is a front view of the vicinity of a control valve, an operation shaft and an operation arm. FIG. 4 is a right side view of the vicinity of the control valve, the planting clutch and the fertilizer application clutch operated to the shutoff position, and the first and second work linking mechanisms. FIG. 9 is a right side view showing a state in which the planting clutch and the fertilizer application clutch have been operated to the transmission position from the state shown in FIG. 8. FIG. 5 is a right side view of the swing unit, the interchange unit, and the length adjusting unit in the first work linkage mechanism. FIG. 6 is a cross-sectional plan view of the swing unit, the interchange unit, and the length adjustment unit in the first work linkage mechanism. It is a right 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 longitudinal rear view of the vicinity of the 1st operation member and link member of a planting clutch. It is a disassembled perspective view of the 1st operation member and link member of a planting clutch. It is a left side view near a marker motor. It is a disassembled top view of the vicinity of a marker motor. It is an exploded perspective view of the vicinity of a marker motor. It is a schematic diagram showing a state of cooperation between a control device and each part. It is a schematic diagram showing a state of cooperation between a control device and each part. It is a top view showing the turning state at the edge. It is a figure which shows the flow of control based on the operation position of an operation lever. It is a figure which shows the flow of control based on the operation position of an operation lever. It is a figure which shows the flow of control based on the operation position of an operation lever. FIG. 10 is a right side view of the first work linkage mechanism in the vicinity of the first and second swinging parts and the interchange part in the first alternative embodiment of the invention. FIG. 26 is a right side view showing a state where the planting clutch and the fertilizer application clutch are operated to the transmission position from the state shown in FIG. 25 in the first another embodiment of the invention. In 1st another form of implementation of invention, it is a cross-sectional top view of the 1st and 2nd rocking|fluctuation part in the 1st work cooperation mechanism, and the interchange part.

1 to 27 show a riding-type rice transplanter, which is an example of a paddy working machine, F indicates a front direction, B indicates a rear direction, U indicates an upward direction, and D indicates a downward direction. , R indicates the rightward direction, and L indicates the leftward direction.

(Overall structure of riding type rice transplanter)
As shown in FIG. 1, the riding-type rice transplanter has a link mechanism 4 supported at the rear of a body 3 having right and left front wheels 1 and right and left rear wheels 2 so as to be swingable up and down. A hydraulic cylinder 5 that is extended to the side and that moves up and down the link mechanism 4 is provided.

A seedling planting device 6 (corresponding to a working device) (corresponding to a first working device) is supported on the rear portion of the link mechanism 4. A fertilizer application device 7 (corresponding to a second working device) that supplies fertilizer to the rice field G is provided across the rear part of the machine body 3 and the seedling planting device 6, and at the lower part on the front side of the seedling planting device 6, A leveling device 50 for leveling the field G is supported.

In the machine body 3, right and left machine body frames 60 along the front-rear direction are provided, a mission case 73 is connected to a front portion of the machine body frame 60, and an engine 34 is supported on a front portion of the mission case 73. ..

(Overall structure 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 rotating case 10, a planting arm 11, a float 12, a seedling stand 13, and the like. Has been.

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-right center of the support frame 8, and the two planted transmission cases 9 are connected to the right and left parts of the support frame 8. Is extended to the rear side.

The rotating case 10 is rotatably supported on the right and left portions of the rear portion of the planted transmission case 9, and the planting arms 11 are supported on both ends of the rotatable case 10. A seedling stand 13 is supported so as to be capable of reciprocating in the left-right direction.

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

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

Right and left markers 23 are supported so as to be vertically slidable 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 supported by the support frame 8 so as to be swingable around the axis P1, and a rotating body 23b supported by the tip of the arm portion 23a so as to be freely rotatable.

As shown in FIG. 19, the marker 23 can move up and down from a work position B1 in which it touches the rice field G to form an index of a work process on the rice field G, and from the rice field G to an upper storage position B2. While the rotating body 23b of the marker 23 operated to the work position B1 is in contact with the rice field G, the machine body 3 advances to form an index on the rice field G while the rotating body 23b of the marker 23 rotates.

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

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

The power of the engine 34 is transmitted to the transmission arm 81 via the fertilization clutch 22 (corresponding to a second work clutch) inside the mission case 73 (see FIGS. 8 and 19). The transmission arm 81 extends to the left outside through the left body frame 60, and is rotationally driven around the axis in the left-right direction. A transmission rod 82 is connected across the transmission arm 81 and the feeding portion 16, and the transmission rod 82 is linearly arranged 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 in the hopper 15 is delivered by the delivery unit 16, and is supplied to the groove making device 18 through the hose 19 by the transport wind of the blower 17. The fertilizer is supplied from the grooving device 18 to the groove on the rice field G while the groove is formed on the rice field G by the grooving device 18.

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

Right and left support members 45 are connected to the left and right ends of the support frame 8. A transmission case 46 is supported by a left support member 45 so as to be vertically swingable and a support arm 47 is supported by a right support member 45 so as to be vertically swingable around an axis P6 which is the same as the transmission shaft 36. There is.

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

The drive shaft 48 and the ground leveling body 53 are rotationally driven in the counterclockwise direction in FIG. 1 by the power of the transmission shaft 36, and the ground leveling body 53 levels the field G. As shown in FIGS. 2 and 3, the support member 45 is extended to the front side, and the cover 54 is attached to the extended portion of the support member 45. The cover 54 stops the mud splashed to the rear side by the leveling body 53, and prevents the mud from accumulating on the float 12.

(Structure related to control valve and lifting motor for lifting operation of seedling planting device)
As shown in FIGS. 4 to 7 and 19, a control valve 24 for supplying/discharging hydraulic oil to/from the hydraulic cylinder 5 is provided below the driver's seat 20 in the rear portion of the machine body 3. The control valve 24 supplies operating oil to the hydraulic cylinder 5 to raise the hydraulic cylinder 5 in an ascending position (contract operation), and discharges the operating oil from the hydraulic cylinder 5 to descend the hydraulic cylinder 5 (extend operation). It can be operated to a descending operation position for stopping and a neutral stop position for stopping the hydraulic cylinder 5.

A spool 24a that is slidable in the front-rear direction (the left-right direction in FIGS. 4 and 5) is provided in the control valve 24 so as to face forward. The spool 24a of the control valve 24 is slidable with a neutral stop position sandwiched between a rising actuation position on the side closer to the control valve 24 on one side and a descending actuation position on the side farther from the control valve 24 on the other side. A spring (not shown) provided inside the control valve 24 is urged to the lowering operation position.

Brackets 25 and 26 are connected to the front part of the control valve 24, and an operation shaft 55 is rotatably supported around a horizontal axis P7 of the brackets 25 and 26. A fan-shaped operation gear 55a is connected to the right end of the operation shaft 55, and a shaft-shaped operation portion 55b is connected to the operation gear 55a. The operation portion 55b extends to the end of the spool 24a of the control valve 24. Has been issued.

A lift motor 56 (corresponding to an actuator) and a reduction mechanism 57 are connected to the bracket 26, and a pinion gear 57a of the reduction mechanism 57 meshes with an operation gear 55a of the operation shaft 55. The pinion gear 57a of the speed reduction mechanism 57 is rotationally driven in the forward and reverse directions by the elevating motor 56, and the operation shaft 55 is rotationally operated in the forward and reverse directions.

As shown in FIGS. 5 and 7, the operating shaft 55 is rotated by the lifting motor 56, so that the operating portion 55b of the operating shaft 55 moves away 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.

(Float support structure for planting equipment)
As shown in FIGS. 1, 2 and 3, the two floats 12 are located on the rear side of the right and left rear wheels 2 in a plan view and below the planted transmission case 9 in a side view. It is located in.

A bracket 27 is connected to the rear portion of the support frame 8, and a float pipe 28 is arranged below the planted transmission case 9 along the left-right direction so that the float pipe 28 is rotatable about an 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 to be movable up and down (swingable) around the horizontal axis P3 of the rear end of the support arm 28a. There is.

A planting depth lever 29 is connected to the float pipe 28 and extends obliquely upward to the upper side. A lever guide 30 is connected to the feed case 14, and a planting depth lever 29 is inserted in 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 axis 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 (the rear portion 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 rearward, and the rake-shaped leveling member 33 is connected to the rear end portion of the support member 32. It is located in the center.

(Structure on the float side related to lifting control of the seedling planting device)
As shown in FIGS. 2 and 3, a channel-shaped detection unit 40 in a front view is swingably supported around a horizontal axis P4 of a bracket 31a connected to the left portion of the frame 31. , Extends upward between the support frame 8 and the cover 54.

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

A long hole 40a along the up-down direction is opened in the detection unit 40, and one end 41a of the connection member 41 is inserted into the long hole 40a of the detection unit 40 from the side. A long hole 29a is opened in the planting depth lever 29, and the other end 41b of the connecting member 41 is inserted into the long 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 lifting and lowering 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.

The float 12 follows the ground contact with the paddy field G as the machine body 3 progresses, and when the seedling planting device 6 moves up and down with respect to the paddy field G (float 12), the float 12 moves axially with respect to the seedling planting device 6. Since it swings up and down around the core P3, the detector 40 moves up and down with respect to the seedling planting device 6 (connecting member 41). The inner portion 43a of the wire 43 is pushed and pulled by the vertical movement of the detection unit 40.

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

The operation portion 44a of the operation arm 44 and the operation portion 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 left-right direction when viewed from the front (see FIG. 7). ). The operation portion 44a of the operation arm 44 and the operation portion 55b of the operation shaft 55 can separately push the spool 24a of the control valve 24 from the lowering operation position to the neutral stop position and the ascending operation position.

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

By swinging the sensitivity lever 58 around the axis 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. By engaging the guide 59, the position of the other end of the outer 43b of the wire 43 is fixed.

(The raising operation of the seedling planting device in the elevation control of the seedling planting device)
In the state shown in FIGS. 3, 4, 5, and 19, the operating portion 55b of the operating 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 operating portion 44a of the operating arm 44. Thus, 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 rice field G, and the seedling planting depth of the seedling planting device 6 (planting arm 11) is maintained at the set planting depth. It

When the seedling planting device 6 descends from the state shown in FIG. 3 and approaches the paddy field G, the float 12 rises with respect to the seedling planting device 6 and the detector 40 rises with respect to the connection 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 side, the operation arm 44 swings counterclockwise in FIG. The spool 24a of the control valve 24 is pushed to the raising operation position by the operating portion 44a, the hydraulic cylinder 5 is raised, and the seedling planting device 6 is raised.

The inner 43a of the wire 43 is pushed to the operation arm 44 side by the raising operation of the seedling planting device 6, and when the seedling planting device 6 returns to the set height H1, the upper end of the detection unit 40. The positional relationship between the portion and the end 41a of the connecting member 41 (the length of the inner 43a extending 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 causes the spool 24a of the control valve 24 to move to the operating arm 44. The operation section 44a of the operation arm 44 is operated while being pushed to the neutral stop position while being pressed, and stopped at the neutral stop position by the operation section 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 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 paddy field G, the float 12 descends with respect to the seedling planting device 6 and the detector 40 descends with respect to the connection member 41. Then, the inner 43a of the wire 43 is pushed to the operation arm 44 side.

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

The spring inside the control valve 24 allows the spool 24a of the control valve 24 to move to the lowered operating position, and the spring inside the control valve 24 causes the spool 24a of the control valve 24 to move to the operating arm 44. The hydraulic cylinder 5 is moved downward while pushing the operating portion 44a of the above, and the hydraulic cylinder 5 is moved downward, and the seedling planting device 6 is operated downward.

When the seedling planting device 6 is lowered, the inner 43a of the wire 43 is pulled to the seedling planting device 6 side, and when the seedling planting device 6 returns to the set height H1, the detection unit 40. The positional relationship between the upper end of the wire 43 and the end 41a of the connecting member 41 (the length of the inner 43a extending 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 side, the operating arm 44 swings counterclockwise in FIG. 4, and the operating portion 44a of the operating arm 44 causes the spool 24a of the control valve 24 to move. 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 in the above (the raising operation of the seedling planting device in the raising/lowering control of the seedling planting device) and the (Descenting 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 operating 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 portion 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 planting depth of seedling)
In the state shown in FIG. 3, the position of the axis P3 (the 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 (see It is the deepest setting planting depth).

When the planting depth lever 29 is operated from the state shown in FIG. 3 and the position of the shaft core P3 (the 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 high. The planting depth of seedlings becomes shallower.

When the planting depth lever 29 is operated and the set planting depth of the seedling is changed, the positions of the float 12 and the detector 40 with respect to the seedling planting device 6 are changed up and down. The connection member 41 is rocked around the axis P5 in conjunction with the planting depth lever 29, and the position of the end 41a of the connection member 41 is changed up and down as described below. ..

When the set planting depth of seedlings is changed to the deep side (the 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 seedlings 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 and the set planting depth of seedlings is changed, the positional relationship between the upper end portion of the detection unit 40 and the end portion 41a of the connection member 41 (of the wire 43). The length of the inner 43a extending from the outer 43b) is maintained in the state shown in FIG.

As a result, the seedling planting device can be operated as described in the above (the raising operation of the seedling planting device in the elevation control of the seedling planting device) and the (descent operation of the seedling planting device in the raising and lowering control of the seedling planting device). 6 is maintained at the set height H1 from the rice field G, and the planting depth of the seedlings by the seedling planting device 6 (planting arm 11) is maintained at the set planting depth.

(Changing the sensitivity of raising/lowering control of seedling planting equipment)
In the raising/lowering control of the seedling planting device 6 described in the 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 lever 58 can set the sensitivity of the elevation control to sensitive and insensitive.

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

As a result, the posture of the float 12 when 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 is increased. It will be in a state to follow the ground sensitively.
Since the float 12 follows the ground surface G sensitively, the spool 24a of the control valve 24 is sensitively operated, and the sensitivity of the lifting control becomes sensitive.

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

As a result, the posture of the float 12 in a state where the spool 24a of the control valve 24 is stopped at the neutral stop position is slightly upward, and the ground contact area of the rice paddy G of the float 12 is reduced. It will be in a state of insensitively following the ground contact.
The float 12 follows the ground surface G insensitively to the ground, so that the spool 24a of the control valve 24 is operated insensitively, and the sensitivity of the lifting control becomes insensitive.

(First work linkage mechanism provided across the lifting motor and the planting clutch)
As shown in FIGS. 4 and 8, a first work linkage mechanism 61 (corresponding to a work linkage mechanism) is provided across the lifting motor 56 and the planting clutch 21. As described below, the first work linkage mechanism 61 is provided with a first linkage portion 63, a swing portion 64, a second linkage portion 65 and the like.

As shown in FIGS. 4, 8, 10, and 11, on the right outer side of the right machine body frame 60, a swing portion 64 is swingably supported around a horizontal axis P9. The oscillating portion 64 is formed by bending a plate material into a channel shape in a plan view, and has an elongated hole 64a in an outer portion of the oscillating portion 64.

As shown in FIGS. 5, 6 and 7, an arm portion 55c is connected to a portion of the operation shaft 55 opposite to the operation gear 55a. The linking part 63 is connected to the arm part 55c of the operating shaft 55, and the operating part 63a, which is the end part of the linking part 63, is inserted into the long hole 64a of the swinging part 64, as shown in FIGS. Has been inserted.

As shown in FIG. 8, the link portion 63 is arranged along the up-down direction, and with respect to a virtual line connecting the operation shaft 55 (axis core P7) and the axis P9 of the swinging part 64 in a side view, The long hole 64a of the swinging portion 64 is arranged on the rear side (the side opposite to the planting clutch 21).

As shown in FIGS. 4, 5, 8 and 10, when the operating shaft 55 is rotated by the lifting motor 56, the operating part of the linking part 63 is interlocked with the operating part 55b of the operating shaft 55 and the arm part 55c. 63a is operated to the 1st position A1 and the 4th position A4, the 2nd position A2, and the 3rd position A3 (refer to the above-mentioned (configuration regarding a control valve for raising/lowering operation of a seedling planting device and a raising/lowering motor)).

As shown in FIGS. 4, 10 and 11, the interchangeable portion 67 provided with the operating portion 63 a of the linking portion 63 and the elongated hole 64 a of the swinging portion 64 serves to connect the first linking portion 63 and the swinging portion 64. It is provided in the connecting portion and is provided in the first work linking mechanism 61.

As shown in FIGS. 8, 10, and 11, the length adjusting unit 66 is attached to the swinging unit 64 (see (Structure of Length Adjusting Unit) (Operation of Length Adjusting Unit) below) and has a rod shape. The linking part 65 is connected to the length adjusting part 66.

A long hole 60a (corresponding to an opening) along the front-rear direction is opened in the right body frame 60, and the linking portion 65 passes from the length adjusting portion 66 through the long hole 60a of the body frame 60 to the right. And the left body frame 60, and extends to the front side. The linking portion 65 is connected to the planting clutch 21 as described later (operation member for operating the planting clutch).

(Operating member for operating the planted clutch)
As shown in FIGS. 8 and 12, the planting clutch 21 is provided inside the rear portion of the mission case 73, and the planting clutch 21 is disposed between the right and left machine body frames 60 in a plan view. There is. An operation rod 68 for operating the planted clutch 21 to the transmission position and the disengagement position is supported by the mission case 73 so as to be vertically slidable.

As shown in FIGS. 12 to 15, a pair of flat plate-shaped (rib-shaped) support portions 83 along the up-down 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 is provided. 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 one side and the other side support portions 83.

A first operation member 69 configured by bending a plate material is provided. To the operation member 69, the operation member portion 69a on one side, the operation member portion 69b on the other side, the operation member spacing portion 69c connected across the operation member portions 69a, 69b on the one side and the other side, the one side and the other side 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 are opened. A long portion 69f and a contact portion 69g extending from the operation member spacing portion 69c are provided.

The operation member portions 69a and 69b on one side and the other side of the operation member 69 are swingable around the axis P10 of the support shaft 84 in a portion of the support shaft 84 between the one side and the other side support portions 83. It is supported and the arm portion 69d of the operation member 69 is connected to the lower portion of the operation 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 linkage mechanism 61 is provided between the lifting motor 56 and the operating member 69 via the operating shaft 55, and the operating shaft extends between the lifting motor 56 and the planting clutch 21. A first work linkage mechanism 61 is provided via 55 and the operation member 69.

When the operating member 69 is rocked around the axis P10, the operating rod 68 (planted clutch 21) is operated to the transmission position and the blocking position. When the operating member 69 is operated to the shut-off position, the contact portion 69g of the operating member 69 contacts the supporting portion 83 on the other side, and the swinging of the operating member 69 beyond the transmission position is stopped.

A first spring 71 (corresponding to a work urging mechanism) is connected to the operation member 69, and the operation member 69 is urged in the counterclockwise direction in FIG. 12 by the spring 71. The planting clutch 21 is biased to the shut-off position by the spring 71.

The operating member spacing portion 69c of the operating member 69 maintains 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 at a predetermined spacing W1. As a result, when the operating member 69 is rocked, the outer surfaces of the operating member portions 69a and 69b on one side and the other side of the operating member 69 come into contact with the inner surfaces of the support portions 83 on the one side and the other side. Slide.

In other words, the spacing W1 in the direction along the axis of the support shaft 84 between the operating member portions 69a and 69b on one side and the other side of the operating member 69 is such that the operating member portion 69a on the one side of the operating member 69 is the distance W1. 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 which the support portion 83 on the other side is contacted with the operation member interval of the operation member 69. A portion 69c is provided.

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

To the linking member 70, the linking member part 70a on one side, the linking member part 70b on the other side, the linking member spacing part 70c connected over the linking member parts 70a, 70b on the one side and the other side, the 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, the linking member portion 70a on one side of the linking member 70 is provided on the outer side 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 is swingable around the axis P10 of the linking shaft 70 at an outer portion of the support shaft 84 on the opposite side of the operating member 69 with respect to the support portion 83 on the other side. 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. Has been maintained. Thus, when the linking member 70 is rocked, the inner surfaces of the linking member portions 70a and 70b on one side and the other side of the linking member 70 contact the outer surfaces of the support portions 83 on the one side and the other side, respectively. Slide.

In other words, the distance W2 in the direction along the axis P10 of the support shaft 84 between the linking member portions 70a and 70b on one side and the other side of the linking member 70 is such that the linking member portion on one side of the linking member 70 is the same. The linking member of the linking member 70 is maintained so that the space 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. A spacing 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 end 65a on the front side of the linking portion 65 is formed. The long hole 69f of the operating member 69 and the long hole 70f of the linking member 70 are inserted.

At the end 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 distance W3 that is the width of the spacer 85.

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

An operating member 75 for operating the fertilizer application clutch 22 to the transmission position and the shutoff position is swingably supported around the vertical axis P11 below the fertilizer application clutch 22. A rod-shaped linking portion 76 is connected across the connecting portion 70d of the linking member 70 and the operating member 75.

A second spring 72 (corresponding to a work urging mechanism) is connected to the operating member 75, and the operating member 75 is urged in the counterclockwise direction in FIG. 13 by the spring 72. The spring 72 is biased to the blocking position.

Thus, the second work linking mechanism 62 is provided between the linking member 70 and the second operating member 75, and the linking member 70 extends between the first work linking mechanism 61 and the fertilizer application clutch 22. A second work linking mechanism 62 is provided via the second operation member 75.

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

An end of the adjustment unit 86, which is triangular and flat in a side view, is supported so as to be vertically swingable around a horizontal axis P12 of the swinging unit 64. A long hole 64b extending in the up-down direction is opened in the swing portion 64, and an end portion 65b of the linking portion 65 is inserted into the long hole 64b of the swing portion 64 and connected to the adjusting portion 86.

Three connecting holes 86a, 86b, 86c are formed in the adjusting portion 86 along the vertical direction, and one connecting hole 64c is opened in the swinging portion 64. In the state shown in FIG. 10, the connecting portion 87 including the bolt and the nut 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 attached to the swinging portion 64. It is in a state of being connected 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 machine body frame 60 in a plan view, and at a position close to the rear wheel 2 in a side view. It is arranged on the rear side of a certain aircraft 3.

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

(Operation of the length adjuster)
10 and 11, when the adjusting portion 86 is vertically swung while the connecting portion 87 is removed, the moving direction of the linking portion 65 (the left and right in FIG. 10) which is the direction along the linking portion 65. The adjusting portion 86 is rocked in a direction intersecting the (direction). Along with the swinging operation of the adjusting portion 86, the end portion 65b of the linking portion 65 is also swung around the axis P12, and is swung 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 from the position shown in FIG. 10 along the moving direction of the linking portion 65. It slightly moves to the side opposite to the portion 66 (axial center P12), and then slightly to the length adjusting part 66 (axial center P12) side.

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 end portion 65b of the linking portion 65 is positioned at the length adjusting portion 66 (axial core). P12) is the farthest side, and the length from the lifting motor 56 of the first work linkage 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 P12). Located on the near side, the length from the lifting motor 56 of the first work linkage mechanism 61 to the planting clutch 21 is slightly shorter than the above 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 set to the length adjusting portion 66 (axis P12) most. Located on the near side, the length from the lifting motor 56 of the first work linkage mechanism 61 to the planting clutch 21 is the shortest.

As described above, the adjusting portion 86 is vertically swung to insert the connecting portion 87 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 moved. 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 linkage portion 65 is slightly changed back and forth along the moving direction of the linkage portion 65, and extends from the lifting motor 56 of the first work linkage mechanism 61 to the planting clutch 21. The length is adjusted.

(Operation of the planting clutch and fertilizer clutch to the disengaged position by the lifting motor)
As shown in FIGS. 8 and 10, when the lifting motor 56 operates the arm portion 55c of the operation shaft 55 to the first position A1, the operation portion 63a of the linkage portion 63 is positioned 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 by the spring 71 in the counterclockwise direction in FIG. 12, the planting clutch 21 is operated to the disengagement position, and the spring 72 is operated. Thus, the operating member 75 is operated in the counterclockwise direction in FIG. 13, and the fertilizer application clutch 22 is operated to the disengagement position. In the state shown in FIGS. 12 and 13, the end portion 65a of the linking portion 65 is located at the front-rear intermediate portion of the elongated hole 69f of the operating member 69, and is located at the rear portion of the elongated hole 70f of the linking member 70.

As shown in FIGS. 8 and 10, even when the arm portion 55c of the operating shaft 55 is operated to the second position A2 and the third position A3 by the elevating motor 56, the operating portion 63a of the linkage portion 63 does not swing. It only moves to the second position A2 and the third position A3 along the long hole 64a (interchangeable part 67) of 64, the swinging part 64 is not operated, and the planting clutch 21 and the fertilizer clutch 22 are in the disengaged position. Maintained.

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

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

(Operation of the planting clutch and fertilizing clutch to the transmission position by the lifting motor)
As shown in FIGS. 8 to 9, when the arm portion 55c of the operating shaft 55 is operated to the fourth position A4 by the lifting motor 56, the operating portion 63a of the linking portion 63 moves into the long hole 64a of the swinging portion 64. Since it reaches the upper end and moves to the fourth position A4 (see FIG. 10), the swinging part 64 is swung counterclockwise in FIG. 9, and the linking part 65 is pulled backward.

When the link portion 65 is pulled rearward from the state shown in FIGS. 12 and 13, the end portion 65a of the link portion 65 is located at the rear portion of the elongated hole 70f of the link member 70, so that the link member is formed. The swinging operation of 70 is performed in the counterclockwise direction in FIG. 12, the linking portion 76 is pulled rearward, and the operating member 75 begins to be operated from the blocking 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 at the front-rear intermediate portion of the elongated hole 69f of the operating member 69, the end portion 65a of the linking portion 65 extends along the elongated hole 69f of the operating member 69. Only by moving to the rear side, the operating member 69 is not operated, and the planted clutch 21 is maintained in the disengaged 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 is cut off against the spring 71 as the linking portion 65 is pulled rearward. Starting to swing from the position to the transmission position. When the linking portion 65 is pulled rearward, 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. It
The operation of operating the planting clutch 21 and the fertilizer application clutch 22 in the lifting motor 56 to the transmission position is transmitted to the planting clutch 21 and the fertilizer application clutch 22 by the interchange part 67.

As shown in FIG. 1, in the fertilizer applicator 7, since the feeding section 16 and the grooving device 18 (field G) are slightly apart, the fertilization clutch 22 is operated to the transmission position, and the first fertilizer from the feeding section 16 is operated. When it is fed, it takes a little time for the first fertilizer to reach the grooving device 18 (Tamen 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 grooving device 18 (field G) at substantially the same time. The planting of the seedlings by the planting arm 11 can be started.

As described above, when the arm 55c of the operating shaft 55 is operated to the fourth position A4 by the lifting motor 56, the first and second springs are operated by the first and second work linking mechanisms 61 and 62. The planting clutch 21 and the fertilizer application clutch 22 are in the state of being operated to the transmission position against 71 and 72.

By operating the arm portion 55c of the operating shaft 55 by the lifting motor 56 to the fourth position A4, the operation of operating the planting clutch 21 in the lifting motor 56 to the transmission position is performed from the first work linkage mechanism 61 to the second position. 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 FIG. 9 to FIG. 8, when the lifting motor 56 operates the arm portion 55c of the operation shaft 55 to the first position A1 (second position A2) (third position A3), the swinging portion 64 links. Since the pulling operation of the portion 65 is eliminated, as described above (operation of the raising/lowering motor to the disengagement position of the planting clutch and the fertilizing clutch), the springs 71 and 72 are used to plant the planting clutch 21 and the fertilizing clutch 22. Are operated to the blocking position at substantially the same time.

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

(Structure for raising and lowering the seedling planting device with the operating lever)
As shown in FIGS. 1 and 19, a steering handle 77 for steering the front wheels 1 is provided in the front portion of the machine body 3, and a control lever 78 (corresponding to an operating tool is provided on the lower right side of the steering handle 77. ) Is provided and is extended to the right side.

The operation lever 78 is artificially moved to the neutral position N, the first raised position U1, the second raised position U2, the first lowered position D1, the second lowered position D2, the rear right marker position R1, and the front left marker position L1. Can be operated. The operating lever 78 is biased to the neutral position N so that when the operator releases the operating lever 78, the operating lever 78 automatically returns to the neutral position N.

The control device 100 is provided in the machine body 3, a position sensor (not shown) that detects 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 that detects 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.

As shown in FIGS. 6, 7, and 19, a position sensor 80 that detects the rotation angle of the operation shaft 55 is connected to the end of the operation shaft 55 on the side of the arm portion 55c, and the detected value of the position sensor 80 is controlled. It is input to the device 100. The position sensor 80 detects the rotation angle of the operation shaft 55, whereby the positions of the operation portion 55b and the arm portion 55c of the operation shaft 55 are detected.

An elevating control unit 101 (corresponding to a control unit) is provided as software in the control device 100 to operate the operating lever 78 (neutral position N, first raised position U1, second raised position U2, first lowered position D1). , The second lowering position D2), and the detection value of the angle sensor 79, the lift control unit 101 (control device 100) operates the lift motor 56 as described below.

(The raising operation of the seedling planting device by the first raising position of the operation lever)
The raising/lowering motor 56 operates the operating portion 55b and the arm portion 55c of the operating shaft 55 to the fourth position A4, and the raising/lowering motor 56 operates the planting clutch 21 and the fertilizer clutch 22 to the transmission position, as shown in FIG. First, assume 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 operation lever 78 is operated to the first raised position U1 (step S1), the operation section 55b of the operation shaft 55 and the arm section 55c are moved by the elevating motor 56. , To the third position A3 (step S2).

As a result, the planting clutch 21 and the fertilizer application clutch 22 are operated to the disengagement position (see (Operation of the planting clutch and fertilizer application clutch to the disengagement position by the lifting motor) described above) and take precedence over the wire 43 and the operation arm 44. The spool 24a of the control valve 24 is pushed to the raising operation position, the hydraulic cylinder 5 is raised, and the seedling planting device 6 is raised.

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

As a result, in the state where the planting clutch 21 and the fertilizer application clutch 22 are operated to the disengagement position, the spool 24a of the control valve 24 is operated to return 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 the state where the operation lever 78 is operated to the first elevated position U1 (the state where the seedling planting device 6 is operated to be elevated) ( (Step S4), the operating portion 55b and the arm portion 55c of the operating shaft 55 are operated to the second position A2 by the lifting motor 56 (step S7).

As a result, even when the operation lever 78 is operated to the first raised position U1, the spool 24a of the control valve 24 is operated to return 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 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 operation lever 78 is operated to the second raised position U2 (step S1), the operating portion 55b of the operating shaft 55 and the arm portion 55c are moved to the third position A3 by the lifting motor 56. It is operated (step S3).

As a result, the planting clutch 21 and the fertilizer application clutch 22 are operated to the disengagement position (see (Operation of the planting clutch and fertilizer application clutch to disengagement position by the lifting motor) described above), and the wire 43 and the operation arm 44 are given priority. The spool 24a of the control valve 24 is pushed to the raising operation position, the hydraulic cylinder 5 is raised, and the seedling planting device 6 is raised.

Even if the operating lever 78 is operated from the second raised 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 lifting motor 56 (step S3). ), the state in which the spool 24a of the control valve 24 is pushed to the raising operation position in priority to the wire 43 and the operating arm 44, and the raising operation of the hydraulic cylinder 5 and the raising operation of the seedling planting device 6 are performed. Continued.

As described above, when the angle sensor 79 detects that the link mechanism 4 has reached the upper limit position in the state where the raising operation of the hydraulic cylinder 5 and the raising operation of the seedling planting device 6 are continued (step S5). The operating portion 55b and the arm portion 55c of the operating shaft 55 are operated to the second position A2 by the lifting motor 56 (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 stop at the upper limit position.

(Descent operation of the seedling planting device by the first lowered position of the operation lever)
At the position where the seedling planting device 6 (float 12) is separated from the rice field G to the upper side, the raising/lowering motor 56 operates the operating portion 55b and the arm portion 55c of the operating shaft 55 to the second position A2, and the seedling planting device 6 It is assumed that the planting clutch 21 and the fertilizer application clutch 22 are operated to the shut-off position by the lifting motor 56.

When the float 12 is separated from the rice field G to the upper side, the float 12 is lowered with respect to the seedling planting device 6, and the detection unit 40 is lowered with respect to the connection member 41. 43a is pushed to the operation arm 44 side.

In the above-described state, as shown in FIGS. 19, 22, and 23, when the operation lever 78 is operated to the first lowered position D1 (step S1), the lifting motor 56 causes the operation portion 55b of the operation shaft 55 and the arm portion 55c. 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 portion 55b of the operation shaft 55 disappears, the spool inside the control valve 24 may cause the spool 24a of the control valve 24 to move to the lowering operation position. 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 spring inside the control valve 24 causes the spool 24a of the control valve 24 to operate the operation portion 44a of the operation arm 44. While pushing, the hydraulic cylinder 5 is moved to the lowering operation position, the hydraulic cylinder 5 is lowered, and the seedling planting device 6 is lowered (refer to the above-mentioned (lowering operation of the seedling planting device in the elevation control of the seedling planting device)). .. The planting clutch 21 and the fertilizer application clutch 22 are operated (maintained) at the shutoff position.

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

As a result, in the state where the planting clutch 21 and the fertilizer application clutch 22 are operated to the disengagement position, the spool 24a of the control valve 24 is operated to return 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, on the road or the like, when the operation lever 78 is operated to the first lowered position D1, 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 a state where the operation lever 78 is operated to the first descending position D1 (a state where the seedling planting device 6 is descending operation) ( (Step S12), the operating portion 55b and the arm portion 55c of the operating shaft 55 are operated to the second position A2 by the lifting motor 56 (step S14).

As a result, even when the operation lever 78 is operated to the first lowered position D1, the spool 24a of the control valve 24 is operated to return 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 stops at the lower limit position.

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

As described above (downward operation of the seedling planting device by the first lowered position of the operation lever), the spool 24a of the control valve 24 is operated by the wire 43 and the operation arm 44, and the control valve 24 is operated. The spool 24a is moved 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 shutoff position.

Even if the operating lever 78 is operated from the second lowered 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 ( In 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 is grounded on the paddy field G, the seedling planting device 6 is maintained at the set height H1 due to the state in which the spool 43a of the control valve 24 is operated by the wire 43 and the operating arm 44, and the seedling planting device is maintained. 6 (planting arm 11) is in a state where the planting depth of the seedlings is maintained at the set planting depth (the above-mentioned (the raising operation of the seedling planting device in the elevation control of the seedling planting device) and the See the descending operation of the seedling planting device in the lifting control of the planting plant)).

For example, on the road or the like, when the operation lever 78 is operated to the second lowered position D2, 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 lifting motor 56 operates the operation portion 55b and the arm portion 55c of the operation shaft 55 to the second position A2 ( 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 stop at the lower limit position.

(Operation of the planting clutch and fertilizer clutch to the transmission position by the second lowered position of the operation lever)
As described above (downward 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, then to the neutral position N, and then to the second position again. When it is operated to the lowered position D2 (steps S23 and S24), the lifting motor 56 operates the arm portion 55c of the operation shaft 55 to the fourth position A4 (step S27).

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

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

The right wire 90 is connected across the upper part of the right operation arm 89 and the arm part 23a of the right marker 23, and across the upper part of the left operation arm 89 and the arm part 23a of the left marker 23, The left wire 90 is connected.

Two long 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 through the opening 88a of the guide plate 88 to the upper side. Out. As shown in FIG. 19, right and left springs 91 that bias 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 on the rear side of the machine body 3 below the driver's seat 20 and on the left and right center side of the machine body, the operation arms 89 and the wires 90 are arranged so as to be adjacent to the hydraulic cylinders 5. It is located near. As shown in FIGS. 16 and 19, the operating portion 5a connected to the piston of the hydraulic cylinder 5 is arranged above the guide plate 88 and behind the operating portion 89a of the operating arm 89.

The state shown by the chain double-dashed 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 operating portion 5a of the hydraulic cylinder 5 is separated from the operating portion 89a of the operating arm 89 rearward, the marker 23 is operated to the working position B1 by the spring 91, and the wire 90 is pulled to the marker 23 side. Thus, the operating portion 89a of the operating 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 chain double-dashed line in FIG. 16, the seedling planting device 6 is lifted by the hydraulic cylinder 5. Along with this, the operating portion 5a of the hydraulic cylinder 5 moves to the front side and hits the operating portion 89a of the operating arm 89, and the operating arm 89 is oscillated counterclockwise in FIG. As a result, the wire 90 is pulled to the operation arm 89 side, and the marker 23 is operated to the storage position B2 against the spring 91.

When the hydraulic cylinder 5 is lowered (the piston is extended) and the seedling planting device 6 is lowered, the operating portion 5a of the hydraulic cylinder 5 moves rearward from the operating portion 89a of the operating arm 89. The marker 23 is operated to the work position B1 by the spring 91, the wire 90 is pulled to the marker 23 side, and the operation portion 89a of the operation arm 89 is positioned 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 to the guide plate 88 upward, and the right and left holding arms 93 can swing around the axis P14 of the support pin 92 independently of each other. 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 and a contact part 88b is provided, and the holding part 93a of the holding arm 93 hits the contact part 88b of the guide plate 88 so that the holding part 93a of the holding arm 93 is flat. It is stopped at the holding position which overlaps with the opening 88a of the guide plate 88 when viewed.

As described above (marker operating mechanism for operating the marker to the working position and the retracted position), the operation arm 5a of the hydraulic cylinder 5 causes the operation arm 5a to operate in association with the raising operation of the seedling planting device 6 by the hydraulic cylinder 5. When 89 is rocked counterclockwise in FIG. 16, the operation portion 89a of the operation arm 89 pushes the holding portion 93a of the holding arm 93 at the holding position against the spring 94, while pushing the holding portion 93a away. 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 moves to the operating portion 89a of the operating arm 89. The operation arm 89 is engaged and 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 operating portion 5a of the hydraulic cylinder 5 is moved to the rear side. Even if moved, the operation arm 89 is held by the holding arm 93 in the posture 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 to the storage position B2 in the storage position B2 in preference to the operation arm 89, the wire 90, and the spring 91.

(Structure for marker motor that can release holding of marker)
As shown in FIGS. 16, 17, and 18, the angle-shaped operation arm 96 in front view can swing in the front-rear direction around the horizontal axis P15 of the support plate 95 supported on the upper side of the guide plate 88. It is supported. A 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 speed reduction mechanism 98 are connected to the support plate 95, and the pinion gear 98a of the speed 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 the operation arm 96 is oscillated 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 into a bifurcated shape in a plan view, is provided with right and left operation portions 99a, and has an arm portion 99b extending 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 distal end portion 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 distal end portion 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. 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, so that the guide plate 88 is supported. A 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 near the hydraulic cylinder 5.

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

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

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

(Structure related to operation of marker motor)
As shown in FIGS. 17 and 19, the position sensor 111 that detects 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 operation member 99 is detected by detecting the rotation angle of the operation arm 96 by the position sensor 111.

The marker control unit 102 is provided in the control device 100 as software, and 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, the marker control unit 102. The marker motor 97 is operated by the (control device 100) as described below.

(Marker operation by the right and left marker positions of the operating lever)
As described in the above (the raising operation of the seedling planting device by the first raising position of the operation lever) (the raising operation of the seedling planting device by the second raising position of the operation lever), the operation lever 78 is set at the first raising position. When the seedling planting device 6 is operated to be raised by operating the U1 or the second raised position U2, the right and left markers 23 as described in the above (marker holding mechanism for holding the marker at 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 descending position D1 or the second descending position D2 and the seedling planting device 6 is descended to the rice field G (the operating portion 5a of the hydraulic cylinder 5 operates the operating arm 89). (The state of being separated from the operation portion 89a to 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 operation lever 78 is operated to the right marker position R1, the operation arm 96 is rocked to the front side by the marker motor 97 as described above (configuration regarding the marker motor capable of releasing the marker holding mechanism). The operation member 99 is rocked in the clockwise direction 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 work position B1 by the spring 91, the right wire 90 is pulled to the right marker 23 side, and the operation portion 89a of the right operation arm 89 is guided by the guide plate 88. It returns to the state of being located at the rear end of the opening 88a (see the chain double-dashed line in FIG. 16).

When the operation lever 78 is operated to the left marker position L1, the operation arm 96 is rocked rearward by the marker motor 97, as described above (configuration regarding 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 work position B1 by the spring 91, the left wire 90 is pulled to the left marker 23 side, and the operation portion 89a of the left operation arm 89 is guided by the guide plate 88. It returns to the state of being located at the rear end of the opening 88a (see the chain double-dashed line in FIG. 16).

When the operating lever 78 is operated to the right marker position R1 (left marker position L1) and 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. Thus, 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 device 78 is operated to the right marker position R1 and then to the left marker position L1 in a state where the seedling planting device 6 is operated to descend to the rice field G (the left marker position L1 is operated, and then the left marker position L1 is operated. When operated to the right marker position R1), the right and left markers 23 are operated to the work position B1.

Even when 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 operated to be raised, the operating portion of the hydraulic cylinder 5 is operated. Since the operation portion 89a of the operation arm 89 is held in the posture shown in FIG. 16 by 5a, the marker 23 is not operated to the work position B1.

(Structure for raising and lowering the soil leveling device)
As shown in FIG. 20, a fan-shaped operation gear 112 is swingably supported around an axial center P16 in the front-rear direction above the front part 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 part of the seedling planting device 6, and the pinion gear of the speed reduction mechanism 114 meshes with the operation gear 112. A link rod 115 is connected across the operation gear 112, the transmission case 46, and the support arm 47.

The electric motor 113 rotationally drives the pinion gear of the speed reduction mechanism 114 in the forward and reverse directions, swings the operation gear 112 in the forward and reverse directions, and raises and lowers the leveling device 50 (the transmission case 46 and the support arm 47) around the axis P6. To be done.

(Height control of leveling device)
As shown in FIGS. 1 and 20, a dial operation type ground leveling switch 116 is provided below 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 ground leveling switch 116 arbitrarily sets the set ground leveling depth of the ground leveling device 50 in the operation range of the work position.

The height sensor 117 is connected to the shaft core P16 portion of 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 detected. Is input to the control device 100. A position sensor 118 that detects the operating 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 ground leveling control unit 103 is provided in the control device 100 as software, and based on the operation position of the ground leveling switch 116 and the detection values of the height sensor 117 and the position sensor 118, the ground leveling control unit 103 (control device 100) operates the electric power. 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 seedling) (the above-mentioned (change of set planting depth of seedling) and FIG. (See) is detected. Based on the set height H1 (set planting depth of seedling) and the detection value of the height sensor 117 (vertical position of the soil leveling device 50 with respect to the seedling planting device 6), the height of the soil leveling device 50 from the field G. Is detected, and the leveling depth H2 of the leveling device 50 is detected.

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

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 The ground leveling depth H2 of the ground leveling device 50 is detected based on the detected value, and the electric motor 113 is operated so that the ground leveling depth H2 of the ground leveling device 50 becomes the set ground leveling depth of the ground leveling switch 116. 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 leveling device 50 to the upper limit position. The upper limit position of the leveling device 50 is a position at which the leveling device 50 is largely lifted from the field G and the leveling device 50 does not touch the field G.

(Turning and planting on the edge)
As shown in FIG. 21, when the riding type rice transplanter finishes one planting process K1 and the aircraft 3 reaches the front of the ridge F, the operator operates the operation lever 78 to plant seedlings. The attachment device 6 is operated to rise from the rice field G (the planting clutch 21 and the fertilizer application clutch 22 are in the disengaged position), and the steering handle 77 is operated to perform the turning J1 at the edge.

When the turning J1 is completed, the operator operates the operation lever 78 to lower the seedling planting device 6 to the rice field G, operate the planting clutch 21 and the fertilizer clutch 22 to the transmission position, and perform the next planting. Entering 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 disengagement 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 that detects 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 operation type planting and arranging switch 119 is provided in the vicinity of the control handle 77, and an operation signal of the planting and arranging switch 119 is input to the control device 100.

As described in the above (Turning and planting on the edge), when the riding type rice transplanter performs the turning J1 on the edge, the detection value of the rotation speed sensor 120 and the steering angle of the front wheel 1 are determined. 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 stroke K1 with the end position K11 as the origin, and the direction along the planting stroke K1. The angle of the machine body 3 with respect to the reference direction is detected with reference to.

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) to the ridge F side, and the angle of the machine body 3 with respect to the reference direction. It gradually grows from 0 degrees.

When the angle of the machine body 3 reaches 90 degrees, the position of the machine body 3 (the seedling planting device 6) stops, and as the angle of the machine body 3 approaches from 90 degrees to 180 degrees as the turning J1 progresses. 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 body 3 becomes 180 degrees, and if the position of the machine body 3 (seedling planting device 6) at the coordinates along the planting process K1 is located at the origin (end position K11), the end position K11 is obtained. It can be determined that the starting position K21 matches.

With the planting alignment switch 119 operated to the work position, the planting alignment control unit 104 (control device 100) causes the lifting motor 56 to move the elevator motor 56 as described below so that the end position K11 matches the start position K21. Operated.

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

The angle of the machine body 3 reaches between 90 degrees and 180 degrees, and the position of the machine body 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 second half of the turning J1, and prioritizes the lifting/lowering control unit 101, the lifting/lowering motor 56 causes the operation unit 55b and the arm unit 55c of the operation shaft 55 to move to the third position. By operating to the position A3, the seedling planting device 6 is lowered to the rice field G (see the above-mentioned (Descent operation of the seedling planting device by the second lowering position of the operation lever)).

Next, when the angle of the machine body 3 becomes 180 degrees and the position of the machine body 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 In preference to the elevation control unit 101, the elevation 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 fertilization clutch 22 to the transmission position. (Refer to the above (operation to the transmission position of the planting clutch and the fertilizer application clutch by the second lowered position of the operation lever)).

By operating the planting/aligning switch 119 within the operation range of the work position of the planting/aligning switch 119, the timing of operating the operating portion 55b and the arm portion 55c of the operating shaft 55 to the fourth position A4 is set to the planting stroke 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 point of reaching 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 and alignment control unit 104, the operator operates the planting and alignment switch 119 as described above, so that the end position K11 and the start position K11 can be changed. K21 can be matched.

When the planting alignment switch 119 is operated to the stop position, the planting alignment control unit 104 stops, and therefore the operator operates the operation lever 78 so that the end position K11 and the start position K21 coincide with each other. The descending operation of the seedling planting device 6 to the rice field G and the operation of the planting clutch 21 and the fertilizer application clutch 22 to the transmission position are performed.

(First Embodiment of the Invention)
The interchange part 67 provided in the first work linkage mechanism 61 may be configured as described below.

As shown in FIGS. 25, 26, and 27, below the control valve 24 and the lifting motor 56, a support shaft 74 is connected across the right and left machine body frames 60. The first swinging portion 64 and the second swinging portion 121 can swing independently of each other around the axis P9 in the left-right direction at the end of the support shaft 74 on the right outside of the right machine body frame 60. It is supported.

A rod-shaped first linking portion 63 is connected across the arm portion 55c of the operation shaft 55 and the swinging portion 64. When the operating shaft 55 is rotationally operated by the lifting motor 56, the swinging part 64 is interlocked with the operating part 55b and the arm part 55c of the operating shaft 55, and the swinging part 64 is moved to the first position A1, the fourth position A4, and the second position. A2, 3rd position A3 is operated (refer to the above-mentioned (configuration regarding control valve for raising/lowering operation of seedling planting device and raising/lowering motor)).

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

As a result, the interchange 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 across the first swing portion 64 and the second swing portion 121. And is provided in the first work linking mechanism 61.

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

As shown in FIG. 25, when the oscillating portion 64 is operated to the first position A1 by the lifting motor 56, the operating portion 64d of the oscillating portion 64 is positioned at the upper end of the elongated hole 121a of the oscillating portion 121. Therefore, the planting clutch 21 and the fertilizer application clutch 22 are operated to the shut-off position.

Even when the arm portion 55c and the swinging portion 64 of the operating shaft 55 are operated to the second position A2 and the third position A3 by the lifting motor 56, the operating portion 64d of the swinging portion 64 does not have the long hole of the swinging portion 121. The oscillating portion 121 is not oscillated only by moving along the 121a, and the planting clutch 21 and the fertilizing clutch 22 are maintained in the disengaged position.

As shown in FIG. 25 to FIG. 26, when the swing motor 64 is operated to the fourth position A4 by the lifting motor 56, the operating portion 64d of the swing portion 64 comes to the upper end of the elongated hole 121a of the swing portion 121. 26, the rocking portion 64 and the rocking portion 121 are integrally rocked in the counterclockwise direction in FIG. 26, and the link portion 65 is pulled rearward.
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 fertilization application clutch to the transmission position by the lifting motor)).

(Second Embodiment of the Invention)
In a state where the engine 34 is stopped, the operation lever 78 is operated to, for example, the second lowered position D2 and then to the neutral position N, and then to the second lowered position D2 again. Is operated in a specific direction, the elevating/lowering control unit 101 (control device 100) operates the elevating/lowering motor 56 to operate the arm portion 55c of the operation shaft 55 to the fourth position A4, and the planted 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 stopping function. The fixed position stopping 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 planting seedlings on the rice field G). Is a little higher than the rice field surface G and the other planting arm 11 is a state immediately before taking out the seedlings from the lower part of the seedling stand 13), and the rotation case 10 is stopped and fixed.

As a result, when the operator manually rotates the rotating case 10 with the engine 34 stopped to perform maintenance work such as checking the amount of seedlings taken out by the planting arm 11, the planting clutch 21 is disengaged. When the rotating case 10 is operated to the position and the above-described fixed position stopping function is working, it becomes difficult to rotate the rotating case 10 manually.

Therefore, if the planting clutch 21 can be operated to the transmission position as described above while the engine 34 is stopped, the fixed position stop function does not work, and the operator manually rotates the rotating case 10. This makes it easy to perform various maintenance work.

(Third Alternative Embodiment of the Invention)
When the engine 34 is stopped while the operation lever 78 is operated to the neutral position N, the lift control unit 101 (control device 100) operates the lift motor 56 to operate the arm unit of the operation 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 lowered position D1 or the second lowered position D2, the above-described lifting control unit 101 (control device 100) performs the operation. It may be configured not to.

(Fourth Embodiment of Implementation of the Invention)
As shown in FIG. 1, an arch-shaped operation arm 122 may be provided at the front end of the machine body 3 in a front view, and the operation arm 122 extends from the standing posture and the machine body 3 shown in FIG. 1 to the front side. It is supported so that it can be used in different postures.

In a normal planting operation, the operation arm 122 is operated in a standing posture. When the riding-type rice transplanter enters the paddy field over the ridge F or leaves the paddy field, a worker standing in front of the machine body 3 holds the operating arm 122 in the use posture to lift the front part of the machine body 3 It can be pressed or the orientation of the machine body 3 can be corrected.

In the operation arm 122 as described above, a tact switch type engine stop switch (not shown) may be provided above the operation arm 122.
Accordingly, when the worker standing in front of the machine body 3 has the operation arm 122 in the use posture, the operator operates the engine stop switch to stop the engine 34, and at the same time, the buzzer or the like is operated. An alarm sounds.

(Fifth Embodiment of the Invention)
In the interchangeable portion 67 shown in FIGS. 8 to 11, the operation portion 63a may be provided in the swing portion 64 and the elongated hole 64a may be provided in the link portion 63.
The interchangeable portion 67 shown in FIGS. 8 to 11 or the interchangeable portion 67 described above is provided at the connecting portion between the linking portion 65 and the swinging portion 64, and not provided at the connecting portion between the linking portion 63 and the swinging portion 64. May be.
The interchangeable portion 67 shown in FIGS. 8 to 11 or the interchangeable portion 67 described above is provided at both the connecting portion between the linking portion 63 and the swinging portion 64 and the connecting portion between the linking portion 65 and the swinging portion 64. May be.

(Sixth Embodiment of the Invention)
In the interchangeable portion 67 shown in FIGS. 25, 26 and 27, the operating portion 64d may be provided in the swinging portion 121 and the elongated hole 121a may be provided in the swinging portion 64.

(Seventh Embodiment of the Invention)
In the length adjusting unit 66 shown in FIGS. 8 to 11, the adjusting unit 86 may be provided with four or more connecting holes 85a, 85b, 85c.
When four or more connecting holes 85a, 85b, 85c are opened in the adjusting portion 86, connecting holes 85a, 85b, 85c approaching each other are generated, so that the approaching connecting holes 85a, 85b, 85c are connected to each other. (For example, a daruma shape) may be formed.

(Eighth Another Embodiment of Invention)
25, 26 and 27, the length adjusting portion 66 is provided at the connecting portion between the first linking portion 63 and the swinging portion 64 or at the connecting portion between the second linking portion 65 and the swinging portion 121. You may be asked.
The length adjusting portion 66 may be provided both at the connecting portion between the first linking portion 63 and the swinging portion 64 and at the connecting portion between the second linking portion 65 and the swinging portion 121.

INDUSTRIAL APPLICABILITY The present invention is not only a riding type rice transplanter, but also a riding type direct seeding device equipped with a seeding device (corresponding to a working device) (not shown) for feeding seeds to a rice field G, and a feeding device for supplying a drug to the rice field G. It can also be applied to a riding type spreader equipped with (corresponding to a working device) (not shown).

3 Airframe 5 Hydraulic cylinder 6 Seedling planting device (working device) (first working device)
7 Fertilizer application (second work device)
12 Float 21 Planted clutch (work clutch) (first work clutch)
22 Fertilizer clutch (second work clutch)
24 control valve 43 wire (elevation linkage mechanism)
44 Operation arm (elevation linkage mechanism)
56 Lifting motor (actuator)
60 Airframe frame 60a Long hole (opening)
61 First Work Link Mechanism (Work Link Mechanism)
62 Second Work Linkage Mechanism 63 First Linkage Section 63a Operation Section 64 Swing Section (First Swing Section)
64a long hole 64d operation part 65 second linking part 66 length adjusting part 67 interchange part 71 spring (work urging mechanism)
72 spring (work urging mechanism)
78 Operation lever (operation tool)
86 adjusting unit 87 connecting unit 101 lifting control unit (control unit)
121 2nd rocking|swiveling part 121a Long hole G Field surface H1 Set height U2 2nd rising position (raising position)
D2 Second lowered position (lowered position)

Claims (21)

A work device supported by a machine body so as to be able to move up and down, a work clutch capable of transmitting and disconnecting power to and from the work device, and a hydraulic cylinder for operating the work device up and down
A control valve that operates the hydraulic cylinder by supplying and discharging hydraulic oil to and from the hydraulic cylinder,
An elevator linkage mechanism for operating the control valve to maintain the working device at a set height from the field surface is provided,
An actuator capable of operating the control valve, a work linking mechanism provided over the actuator and the work clutch, and an operation tool that can be operated manually.
A control unit that operates the actuator such that the control valve is operated based on the operation of the operation tool and the work clutch is operated to a transmission position or a disengagement position via the work linkage mechanism. Being
In the work linkage mechanism,
The operation of operating the control valve to the raised operating position in preference to the lifting linkage mechanism of the actuator and the operation of maintaining the control valve in the actuator operated by the lifting linkage mechanism include the work clutch. The paddy work machine is provided with an interchange part that prevents the operation of operating the work clutch in the actuator to the transmission position from being transmitted to the work clutch. In the work linkage mechanism,
A first linking part that is connected to the actuator and transmits the operation of the actuator; a swinging part that is connected to the first linking part and swings in conjunction with the first linking part; A second linking part connected across the moving part and the working clutch,
The flexible portion is provided in at least one of a connecting portion between the first linking portion and the swinging portion and a second connecting portion between the linking portion and the swinging portion. Paddy work machine described in 1. In the interchange section,
3. An operation section provided on one of the linking section and the swing section, and an elongated hole provided on the other of the link section and the swing section, into which the operation section is inserted. Paddy work machine described in. In the work linkage mechanism,
A first linking part that is connected to the actuator and transmits the operation of the actuator; and a first rocking part that is connected to the first linking part and rocks in conjunction with the first linking part. A swingable second swinging portion and a second linking portion connected across the second swinging portion and the work clutch,
The paddy work machine according to claim 1, wherein the interchange portion is provided across the first swing portion and the second swing portion. In the interchange section,
The operation unit provided on one of the first swing unit and the second swing unit, and the operation unit provided on the other of the first swing unit and the second swing unit, The paddy work machine according to claim 4, wherein an elongated hole to be inserted is provided. The paddy work machine according to any one of claims 1 to 5, further comprising a length adjuster capable of adjusting a length from the actuator of the work linkage mechanism to the work clutch. In the work linkage mechanism,
A first linking part that is connected to the actuator and transmits the operation of the actuator; a swinging part that is connected to the first linking part and swings in conjunction with the first linking part; A second linking part connected across the moving part and the working clutch,
The length adjusting portion is provided on at least one of a connecting portion between the first linking portion and the swinging portion and a second connecting portion between the linking portion and the swinging portion. The paddy work machine according to claim 6. A right and left body frame is provided, and the work clutch is arranged between the right and left body frames in a plan view,
The length adjusting part and the swinging part are arranged on the right outer side of the right machine frame or on the left outer side of the left machine frame in a plan view,
The paddy work machine according to claim 7, wherein the second linking portion extends from the swinging portion to the work clutch through an opening formed in the machine body frame. 9. The paddy work machine according to claim 7, wherein the length adjusting unit is capable of changing a connection position of the swinging unit in the linking unit along a moving direction of the linking unit. In the length adjusting section,
An adjusting portion that is swingably supported by the swinging portion and to which the linking portion is connected;
The paddy work machine according to claim 9, wherein a connecting portion that can connect the adjusting portion to the swinging portion is provided at an arbitrary position within a swinging range of the adjusting portion in the swinging portion. .. The paddy work machine according to claim 10, wherein the adjusting portion is supported by the swinging portion so as to swing in a direction intersecting a moving direction of the linking portion. The paddy work machine according to claim 1, wherein the work linkage mechanism is pulled to the actuator side by the actuator, and the work clutch is operated to a transmission position. First work device, first work clutch capable of transmitting and disconnecting power to the first work device, second work device, capable of transmitting and disconnecting power to the second work device Equipped with a second working clutch,
A first work linkage mechanism provided with the interchange part and provided across the actuator and the first work clutch;
A second work linkage mechanism provided across the first work linkage mechanism and the second work clutch is provided,
The second work clutch is operated to the transmission position or the cut-off position via the second work linkage mechanism as the first work clutch is operated to the transmission position or the cut-off position. The paddy work machine according to any one of 1 to 12. The first work linkage mechanism is pulled to the actuator side by the actuator, and the first work clutch is operated to the transmission position;
As the first work clutch is operated to the transmission position, the second work linkage mechanism is pulled to the first work linkage mechanism side to move the second work clutch to the transmission position. The paddy work machine according to claim 13, which is operated. The control unit is
When the operating tool is operated to the raised position, the work clutch is operated to the disengaged position, and the control valve is operated to and maintained at the raised operating position in preference to the elevating and lowering mechanism. The paddy work machine according to any one of claims 1 to 14, which operates an actuator. A work urging mechanism for urging the work clutch to a disengaged position is provided,
The control unit is
When the operating tool is operated to the raised position, the work urging mechanism operates the work clutch to the disengaged position, and the control valve is operated to and maintained at the raised actuation position in preference to the elevation linkage mechanism. 16. The paddy work machine according to claim 15, wherein the actuator is operated so as to operate. The control unit is
When the operation tool is operated to the lowered position, the work clutch is operated to the disengaged position, and the actuator is operated so that the control valve is maintained to be operated by the elevating and lowering mechanism. Item 15. The paddy work machine according to Item 15 or 16. A work urging mechanism for urging the work clutch to a disengaged position is provided,
The control unit is
When the operation tool is operated to the lowered position, the work clutch is operated to the disengaged position by the work urging mechanism, and the control valve is maintained to be operated by the lift linkage mechanism. The paddy work machine according to claim 17, wherein the paddy work machine is operated. The control unit is
When the operating tool is operated to the lowered position and then to the lowered position again, the working clutch is operated to the transmission position while maintaining the state in which the control valve is operated by the elevating and lowering linkage mechanism. The paddy work machine according to claim 17 or 18, which operates the actuator. A work urging mechanism for urging the work clutch to a disengaged position is provided,
The control unit is
When the operating tool is operated to the descending position and then to the descending position again, the work linkage mechanism resists the work biasing mechanism while maintaining the state in which the control valve is operated by the lift linkage mechanism. The paddy work machine according to claim 19, wherein the actuator is operated so that the work clutch is operated to a transmission position. A float that is supported by the working device so as to be able to move up and down and follows the ground contact with the rice field
Provided over the control valve and the float, mechanically transmitting the height of the working device with respect to the float to the control valve to operate the control valve, so that the working device is set at the set height from a paddy field. The paddy working machine according to any one of claims 1 to 20, further comprising: the elevating and lowering linkage mechanism that is maintained at the above.

Images