JPH09168322A - Single-wheeled paddy work machine - Google Patents

Abstract

(57) [Summary] [Purpose] The planting depth may change even with local unevenness,
Disadvantages such as disposing an ascending / descending control system by struggling with a congested space between equipment such as wheels and a mission case are eliminated while maintaining the configuration in which the left and right floats are used as independent legs. [Configuration] In a single-wheeled rice transplanter equipped with a lifting control mechanism 35 that maintains a constant planting depth by lifting and lowering the single wheel 10 based on fluctuations in the ground pressure of the left and right floats, the lifting control mechanism 35 Comparison of the left and right floats with respect to the wheels 10 and the lift control state in which the depth is kept constant, the neutral lock state in which the left and right floats are locked at a relatively low position with respect to the wheels 10 and the aircraft can be maintained in an independent posture. The mechanical lifting control valve 15 has a lifting control valve 15 so that it can be locked at a relatively high position and three states, that is, a forced lifting state suitable for traveling traveling can be revealed.
And the hand operation rod 21 are mechanically linked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a single propelling wheel on a traveling machine body so that it can be lifted and lowered by a drive unit, and grounds the propelling wheel based on the lifting operation due to ground pressure fluctuations of a pair of left and right ground floats. The present invention relates to a single-wheeled paddy work machine having an elevating control mechanism that raises and lowers in a direction opposite to that of a float to maintain a constant height above ground of a work device.

[0002]

2. Description of the Related Art In this type of single-wheeled paddy field working machine, it is necessary to be self-supporting on the road, so it may be possible to install self-supporting legs for that purpose. In view of the fact that the float is provided, conventionally, a mechanism for locking a refraction swing link that connects the ground float and the airframe is provided, and this ground float is used as a self-supporting leg (for example, the actual open shovel). 50-14951
No. 0).

[0003]

In the case of the above configuration,
By connecting the bending link and the hand lever with a wire mechanism, forcibly switching the bending link to the extended state and maintaining the extended state, the traveling body can be made independent on the ground float, but the bending of the left and right ground floats can be performed. The link is integrated with the connecting rod that passes right and left, and this connecting rod and the hand lever are connected by a wire mechanism, so if you operate the single operating lever even when extending the left and right bending links, Although it has the advantage that there is no need to provide left and right steering levers corresponding to the left and right refraction links, it is necessary to integrate the left and right refraction links with connecting rods, etc. Was. Even if there are local irregularities that do not directly affect the planting surfaces on the left and right, one grounding float rides on the convex part and the other grounding float is also lifted in conjunction with it, and the lifting control mechanism operates. Therefore, the planting depth may change. Further, since the connecting rod has to be arranged by sewing a congested gap between the devices such as the propulsion wheels and the engine / transmission case which operate up and down, it is necessary to arrange the arrangement. It is an object of the present invention to provide a device that can solve the conventional drawbacks while maintaining the configuration in which the left and right grounded floats are used for the independent legs.

[0004]

The characteristic configuration according to the present invention is that the left and right grounding floats are independently provided so as to be able to move up and down, and the left and right ends are connected to the respective left and right grounding floats. Operate the lifting drive device by the point where the operating arm for the lifting drive device of the propulsion wheel is linked and linked at the center of both ends of the operating rod, and by the parallel lifting movement of the operating rod based on the same amount of vertical lifting operation of the left and right ground floats. In order to do so, a lift control mechanism is configured, and a lock mechanism is provided to act on the operating rod to restrain the ascending operation, and the effect is as follows.

[0005]

As a result of the characteristic construction, as shown in FIG. 3 (a), when the operating rod (20) moves up and down in parallel: when the left and right ground floats (7), (7) operate in the same direction and the same lifting amount. For the first time, the elevating control mechanism (35) operates, but the elevating control mechanism 35 does not operate by the elevating operation of only one ground float (7) such that only one end of the operating rod (20) elevates. Therefore, as shown in FIGS. 1 and 2, by providing a mechanism (32) for locking the ascending operation of the operating rod 20 that moves up and down as the earthing floats (7) and (7) ascend and descend, grounding is reversed. The rising operation of the float (7) can be prevented. Moreover, since the left and right ground floats (7) and (7) are linked to both ends of the operating rod (20), the left and right floats (7) and (7) are simultaneously locked by locking only the operating rod (20). The rising operation can be prevented.

[0006]

Since the left and right grounding floats can be independently moved up and down, the planting depth is not changed even in the case of a conventional local convex portion, and the grounding is performed. In order to take advantage of the independent lifting operation of the float, it is not necessary to operate the lock mechanism on the left and right bending links as in the past by selecting the operating rod provided between the float and the lifting drive structure as the object for locking. Alternatively, the locking mechanism may be a single one for the operating rod. Therefore, a single operation tool for operating the lock mechanism may be used.

[0007]

EXAMPLE As shown in FIG. 4, an engine 1 and a mission case 2 are arranged in the front part of the machine body, and a transmission case 3, which also serves as a machine body frame, is provided from both lateral sides of the mission case 2 toward the rear of the machine body. 3 is extended, a planting case 4 is attached to the extension ends of the transmission cases 3, 3, and the planting case 4 is provided with a planting mechanism 5, a seedling stand 6, and a pair of left and right ground floats 7, 7. Seedling planting device 8 and control handle 9
For the airframe provided with the above, a wheel case 11 which substantially supports one propulsion wheel 10 is pivotally supported so as to be able to swing up and down to constitute a walking type rice transplanter which is one of the paddy field working machines. It is. As shown in FIG. 4, the grounding float 7 pivotally supports the rear bracket 7B on the intermediate portion in the longitudinal direction of the swing arm 25 extending from the body frame, and the rearward extending end of the swing arm 25 is vertically moved. Bracket 12 with adjustable mounting position
The front bracket 7A is attached to the transmission case 3 so as to be relatively slidable and fixed, and the front bracket 7A is vertically swingable with the rear bracket 7B as a fulcrum. As shown in FIG. 1, the propulsion wheels 10
A transmission bracket 13 is erected on the vehicle wheel case 11, and an extension end of the bracket 13 is connected to a piston rod of a hydraulic cylinder 14 which is one of the wheel elevating and lowering drive devices fixed to the transmission case 3. The propelling wheel 10 is vertically swingable by a switching operation of a control valve 15 described later. The interlocking mechanism 16 of the grounding float 7 and the control valve 18 will be described in detail. As shown in FIGS. 1 and 4, the vertical arm 17A of the left and right actuating arms 17, 17 that swings independently from the front end of the sensor float 7. ，
17A is erected, a horizontal support shaft 18 is erected on a support frame 26 erected from the mission case 2, and the horizontal support shaft 18 has a left-right swing member 2 having a U-shaped cross section.
7 and 28 are pivotally supported, and these left and right swing members 2
The one-side arm portions 27A, 28A of 7, 28 are connected to the vertical arms 17A, 17A. Then, the operating rod 20 is installed over the other side arm portions 27B, 28B of the left and right swing members 27, 28, and one side of the U-shaped cross section of the passive arm 19 pivotally supported by the lateral support shaft 18 is operated by the operating rod 20. The rod 20 is made to come into contact with the rod 20 from above, and the other side of the rod 20 is interlocked with a drive arm 24 fitted to the operation shaft of the control valve 15 via a rod 22. The drive arm 24
A built-in urging mechanism (not shown) and a ground float 7
The posture is maintained at the neutral position by the balance with the ground reaction force of the above, and the passive arm 19 can be pressed and biased against the operating rod 20 by the biasing mechanism, and the rod 22 and the large diameter case portion 22A are A rod portion 22B slidable relative to the large-diameter case portion 22A and both of them 22A, 2
2B is provided with a biasing spring 22C, and when both the sensor floats 7 and 7 are displaced in the same direction by a preset amount or more, the drive is performed via a passive arm 19 against the force of the spring 22C. The arm 24 is operated in either direction from the neutral position. That is, FIG.
As shown in (a), even if only one of the left and right floats 7 causes a single operation due to the local unevenness of the tiller of the wheel 10 located on the float 7 side, the phantom line in the figure As shown, the operating rod 20 is inclined in the longitudinal direction, and the movement of the passive rod 19 causes the moving amount of the passive arm 19 to move with respect to the length l1 of the operating rod 20.
Length l2 from one end of 0 to the point of contact with the passive arm 19
Is smaller than the movement amount of the sensor float 7, and is absorbed by the spring 22C inside the rod 22, and the drive arm 24 is not substantially operated. Therefore, the elevation control of the wheel 10 is not performed in the local unevenness, and the posture change of the seedling planting apparatus 8 with respect to the rice field can be suppressed. Only when the left and right floats 7, 7 are displaced in the same direction and by a set amount or more, the spring 22
The drive arm 24 is operated against the C displacement. Above, the sensor float 7, the interlocking mechanism 16, and the control valve 15 are referred to as the lifting control mechanism 35. The rod 2
2 and the passive arm 19 at the pin connection portion, the tip hook portion 21A is locked to this pin to forcibly control the valve 15.
A hand operation rod 21 for operating the machine is locked, and the hand operation rod 21 is configured to be attached by supporting a hand grip 21B on a machine frame side guide plate 23 in front of the seedling stand 6. Meanwhile, as shown in FIGS. 1 and 2, a pair of left and right support brackets 29, 2 is provided in front of the support frame 26.
9 and the holding arm 30 having a U-shaped cross section
Is extended rearward toward the operating rod 20. This presser arm 3
0 bypasses the lower side of the lateral support shaft 18 and contacts the operating rod 20 from above. Further, the holding arm 30 is linked with a distal end hook portion 21A of the hand operation rod 21 by a tension spring 31. Therefore, the hand operation rod 21
When the operation lever 20 is pulled to the front, the pressing arm 30 acts on the operating rod 20 by abutting and pressing action to prevent the operating rod 20 from being lifted. Therefore, the two floats 7, 7 linked to the operating rod 20 cannot be raised. In other words, the ground floats 7, 7 become independent legs when the rice transplanter becomes independent on a road or the like. The pressing arm 30, tension spring 31,
The hand operation rod 21 is referred to as a lock mechanism 32 that restrains the upward movement of the operating rod 20. However, operating rod 2 at hand
Since 1 is also an operation lever for forcibly raising the wheels, the linkage with the operation on the lock mechanism 32 is as follows. As shown in FIG. 1, the guide plate 23 of the hand operation rod 21
At the corresponding position, a hooking piece 33 that is locked to the edge of the hole 23A of the guide plate 23 is fixed. The hooking piece 33 has a stepped portion 33A in the middle, and a rear end (downward opening locking on the hand side). Groove 33
B is formed. Therefore, when the locking groove 33B is locked to the edge of the hole 23A as shown in FIG. 1, the distal end hook portion 21A of the hand operation rod 21 is a passive arm as shown in FIG. 19 is in a non-acting position in which it is moved forward to allow free swinging of the control valve 15 (that is, the control valve 15 is freely switchable), and the tension spring 31 is also in a contracted state, so that the pressing arm 30 and the operating rod 20 are free to move. It does not exert enough pressure to regulate swinging. That is, it is possible to bring the sensor float 7 up and down control. Next, when the operation rod 21 is pulled forward from the state of FIG. 1 and the stepped portion 33A is locked to the edge of the hole 23A of the guide plate 23, the control valve 15 is operated by the tip hook portion 21A of the operation rod 21. The tension spring 31 can be forcibly maintained in the neutral position, and the tension spring 31 is extended to restrict the lifting operation of the operating rod 20 by the pressing arm 30 from the state of FIG. 3B to the state of C. The sensor floats 7 and 7 can maintain the traveling aircraft in an independent posture. In addition, pull the operating rod 21 at hand,
When the front end edge 33C of the hooking piece 33 is locked to the edge of the hole 23A of the guide plate 23, the control valve 15 is forcibly switched to the wheel ascending direction. In this case, the hand operation rod 21 is pulled further forward, but the extension movement of the tension spring 31 blocks the downward movement of the holding arm 30 with respect to the operating rod 20.

[Other Embodiments] (a) The pressing arm 30 and the planting clutch lever 34 are connected by a wire mechanism or the like, and the planting clutch is disengaged to lock the lock mechanism 3.
It is also possible to adopt a configuration in which 2 is switched to the locked state and the lock is released by engaging the planting clutch. (B) The distal end hook portion 21A of the hand operation rod 21 may be directly linked to the drive arm 24 of the control valve 15. (C) The paddy field work machine may be a rice transplanter with a fertilizer application. In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a plan view showing a lock mechanism for a lift control mechanism.

FIG. 2 is a side view of the lock mechanism,

[Fig. 3] (a) Operation diagram showing a lifting control state in which the operating rod is in a free state. (B) Action diagram showing a state in which a lock mechanism acts on the operating rod. (C) The operating rod is pushed down by the locking mechanism to be grounded. Action diagram showing the state in which the vertical movement of the float is locked

FIG. 4 is an overall side view.

[Explanation of symbols]

 7 Ground Float 8 Working Device 10 Propulsion Wheel 14 Drive Device 19 Passive Arm 20 Actuating Rod 32 Lock Mechanism 35 Lift Control Mechanism

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[Procedure amendment]

[Submission date] February 5, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of Invention] Single-wheeled paddy working machine

Claims: A single propulsion wheel (10) is attached to a traveling machine body by a drive device (14) so as to be able to move up and down, and the ground pressure fluctuations of a pair of left and right ground floats (7), (7) An elevating control mechanism (3) for elevating and lowering the propulsion wheel (10) in a direction opposite to that of the grounding float (7) based on the ascending / descending operation so as to maintain a constant height of the working device (8) opposite to the earthing position.
5) A single-wheel walking type paddy working machine having 5), wherein the left and right ground floats (7), (7) are independently raised and lowered
Actuator provided operably and arranged left and right
The rod (20) and the left and right ground floats (7), (7)
With the right and left ground floats (7)
Connect the left and right ends of the operating rod (20) so that they can be raised and lowered separately.
Elevating drive device capable of driving and raising and lowering the propulsion wheel (10) in operative cooperation
A passive arm (19) capable of operating (14), and the operation
The left and right ground floats on the left and right of the rod (20)
(7), the central part between the interlocking linkage points with (7)
The left and right ground floats (7), (7) are in the same direction
Before being raised and lowered by more than the set amount
The elevating and lowering drive device is provided by vertically moving the operating rod (20).
The passive arm (19) is operated so that (14) is operated.
Elevation control mechanism for linking with the elevation drive device (14)
(35), which acts on the operating rod (20) to act on the operating rod (20).
A lock mechanism (32) for restraining the ascent operation is provided.
In addition, an operation tool (21) that can be operated at hand and the lifting control mechanism
A linking operation mechanism (36) that can link with (35) is provided.
The lock mechanism (32) is connected to the lifting drive device (14).
Acting on said passive arm (19) when is neutral
The left and right ground floats (7), (7) rise.
While the raising / lowering operation of the operating rod (20) in the direction is restrained.
In the upright locked state, the propulsion wheels (10) are moved down.
In order to operate the lifting drive device (14) in the direction
The passive arm (19) is operated to move the operating rod (20).
In order for the forced ascending state to move up and down to appear,
The passive arm (19) can be operated by the operation tool (21)
The link operation mechanism (36) is formed in a operable state.
A one-wheeled paddy work machine composed of .

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a single propelling wheel on a traveling machine body so that it can be lifted and lowered by a drive unit, and grounds the propelling wheel based on the lifting operation due to ground pressure fluctuations of a pair of left and right ground floats. The present invention relates to a single-wheeled paddy work machine having an elevating control mechanism that raises and lowers in a direction opposite to that of a float to maintain a constant height above ground of a work device.

[0002]

2. Description of the Related Art In this type of single-wheeled paddy field working machine, it is necessary to be self-supporting on the road, so it may be possible to install self-supporting legs for that purpose. In view of the fact that the float is provided, conventionally, a mechanism for locking a refraction swing link that connects the ground float and the airframe is provided, and this ground float is used as a self-supporting leg (for example, the actual open shovel). 50-14951
No. 0).

[0003]

In the case of the above configuration,
By connecting the bending link and the hand lever with a wire mechanism, forcibly switching the bending link to the extended state and maintaining the extended state, the traveling body can be made independent on the ground float, but the bending of the left and right ground floats can be performed. The link is integrated with the connecting rod that passes right and left, and this connecting rod and the hand lever are connected by a wire mechanism, so if you operate the single operating lever even when extending the left and right bending links, Although it has the advantage that there is no need to provide left and right steering levers corresponding to the left and right refraction links, it is necessary to integrate the left and right refraction links with connecting rods, etc. Was.

[0004] Even if there are local irregularities that do not directly affect the left and right planting surfaces, one of the ground floats rises on the protruding part, and the other ground float also rises, thereby raising and lowering the control mechanism. May be activated to change the planting depth. Further, since the connecting rod has to be arranged by sewing a congested gap between the devices such as the propulsion wheels and the engine / transmission case which operate up and down, it is necessary to arrange the arrangement.

An object of the present invention is to provide an apparatus which can solve the conventional disadvantages while maintaining the configuration in which the left and right landing floats are used for the independent legs.

[0006]

In order to achieve the above-mentioned object, the present invention mounts a single propelling wheel on a traveling machine body so that it can be lifted and lowered by a drive unit, and changes the ground pressure of a pair of left and right ground floats. Based on the lifting operation, the propulsion wheels are moved up and down in the direction opposite to the grounding float, and the left and right grounding floats are independent in the single-wheeled paddy work machine that has a lifting control mechanism that maintains the working device's opposing height constant. The left and right actuating rods and the left and right ground floats are interlocked so that the left and right ends of the actuating rod move up and down separately as the left and right ground floats move up and down. Synchronize the passive arm that can operate the elevator drive device that can drive and elevate the propulsion wheels, and the central part between the interlocking link points of the left and right ground floats on the left and right of the operating rod. Linked linked to the condition to be lifting Te, the right and left ground float together in the same direction, and, by the lifting movement of the actuating rod, which is based on the lifting operation than the set amount,
Constructs an elevating control mechanism that links the passive arm and the elevating drive so that the elevating drive can be operated, and provides a lock mechanism that acts on the operating rod to control the elevating operation of this operating rod, and is also operable at hand. Provide an interlocking operation mechanism capable of interlocking and linking a simple operation tool and an elevating control mechanism, and operate the lock mechanism on a passive arm when the elevating drive device is neutral,
Operate the passive arm by operating the passive arm so that the lifting and lowering operation of the operating rod in the direction in which the left and right ground floats are raised is restrained and the lifting drive device is operated in the direction in which the propulsion wheel is moved downward. It is characterized in that the cooperative operation mechanism is formed so that the passive arm can be operated by the operation tool so that the forced ascending and descending movement of the forcibly rising and falling state can appear.

[0007]

According to the above-mentioned structure, when the operating rod 20 is moved up and down in parallel, and the left and right ground floats 7, 7 are operated in the same direction and by the set amount, the raising / lowering control mechanism 35 operates only. However, the operating rod on one side is operated. The elevating control mechanism 35 does not operate when only one of the ground floats 7 elevates and lowers by 20 (see FIG. 3A). That is, since the right and left ground floats 7, 7 can be independently lifted and lowered,
Even when riding on a local convex portion, the planting depth does not change as in the related art.

When the lock mechanism 32 capable of restraining the ascending operation of the operating rod 20 which moves up and down with the ascending and descending operations of the left and right grounding floats 7, 7 is brought into the neutral locking state, the grounding float (7) is relatively moved with respect to the body. It can be maintained at a low position and its lifting operation can be prevented (see FIGS. 1 and 2). That is, since the left and right ground floats 7, 7 are linked to both ends of the operating rod 20, by locking the operating rod 20, the left and right ground floats 7, 7 are simultaneously locked.
In this state, the left and right ground floats 7, 7 can be used as independent legs.

Further, when the lock mechanism 32 is forcibly raised, the left and right ground floats 7, 7 can be locked in a state where they are moved to a relatively high position raised with respect to the body, and the ground floats do not wander during traveling. Therefore, it is possible to make it easy to travel and to make it hard to contact with other objects such as slopes of ridges.

[0010]

As a result, the independent lifting structure of the left and right ground floats makes it possible to make the planting depth constant even if the planting surface is a little rough, and to provide a relatively simple locking mechanism for restraining a single operating rod. On the other hand, it is possible to lock the up and down movements of the left and right ground floats together, which can be used as a self-supporting leg and contribute to stable movement traveling with less risk of collision with other objects. Also, there is an advantage that a single operation tool of the lock mechanism is required.

[0011]

EXAMPLE As shown in FIG. 4, an engine 1 and a mission case 2 are arranged in the front part of the machine body, and a transmission case 3, which also serves as a machine body frame, is provided from both lateral sides of the mission case 2 toward the rear of the machine body. 3 is extended, a planting case 4 is attached to the extension ends of the transmission cases 3, 3, and the planting case 4 is provided with a planting mechanism 5, a seedling stand 6, and a pair of left and right ground floats 7, 7. Seedling planting device 8 and control handle 9
For the airframe provided with the above, a wheel case 11 which substantially supports one propulsion wheel 10 is pivotally supported so as to be able to swing up and down to constitute a walking type rice transplanter which is one of the paddy field working machines. It is.

As shown in FIG. 4, the ground float 7 includes a swing arm 2 extending from a rear frame 7B of the body frame.
5, and a rearwardly extending end of the swing arm 25 is attached to the body via a bracket 12 whose mounting position can be adjusted up and down.
Is mounted on the transmission case 3 so as to be relatively slidable and fixable, and is configured to be vertically swingable with the front bracket 7A with the rear bracket 7B as a fulcrum.

As shown in FIG. 1, a transmission bracket 13 is erected on a wheel case 11 for a propulsion wheel 10, and the extending end of the bracket 13 is attached to the transmission case 3. One of the hydraulic cylinders 14 is connected to a piston rod, and the propulsion wheel 10 is configured to be vertically swingable by a switching operation of a control valve 15 described later.

The interlocking mechanism 16 between the ground float 7 and the control valve 15 will be described in detail. As shown in FIGS. 1 and 4, the left and right operating arms 17, 17 swinging independently from the front end of the sensor float 7 are shown. Orientation arm 17A, 17A
And a horizontal support shaft 18 is erected on a support frame 26 erected from the transmission case 2, and the horizontal support shaft 18 has left and right swing members 27 and 28 having a U-shaped cross section.
And the side arms 27A, 28A of the left and right swing members 27, 28 are connected to the vertical arms 17A, 1A.
7A.

An operating rod 20 is laid across the other side arm portions 27B and 28B of the left and right swing members 27 and 28, and one side of the U-shaped cross section of the passive arm 19 pivotally supported on the horizontal support shaft 18 is formed. The actuator is actuated so as to contact the operating rod 20 from above, and the other side is interlocked to a drive arm 24 fitted on the operating shaft of the control valve 15 via a rod 22.

The drive arm 24 is maintained in a neutral position by a balance between a built-in biasing mechanism (not shown) and a ground reaction force of the ground float 7, and the passive arm 19 is actuated by the biasing mechanism. A biasing spring 22C is provided between the large-diameter case portion 22A and the rod portion 22B slidable relative to the large-diameter case portion 22A. When the sensor floats 7 and 7 are both displaced in the same direction by a predetermined amount or more, the drive arm 24 is operated in any direction from the neutral position via the passive arm 19 against the force of the spring 22C. It is like that.

That is, as shown in FIG. 3 (a), it is assumed that only one of the right and left floats 7 causes a single operation caused by local unevenness of the cultivator of the wheel 10 located on the float 7 side. Also, as shown by the phantom line in the figure, the operating rod 20 is in a posture inclined in the longitudinal direction, and the amount of movement of the passive arm 19 by the operation of the operating rod 20 causes one end of the operating rod 20 to the length L1 of the operating rod 20. Since it is determined from the ratio of the length L2 to the contact point with the passive arm 19 and is smaller than the amount of movement of the sensor float 7, it is absorbed by the spring 22C in the rod 22, and the drive arm 24 is not substantially operated.

Therefore, the elevation control of the wheel 10 is not performed in the local unevenness, and the posture change of the planting device 8 with respect to the rice field surface can be suppressed, and both the left and right floats 7, 7 are displaced in the same direction and by a set amount or more. Only if the spring 22C
The drive arm 24 is operated against the displacement. As described above, the sensor float 7, the interlocking mechanism 16, the control valve 15, and the like are referred to as an elevating control mechanism 35.

The pin 22 is connected to the rod 22 and the passive arm 19.
And the pin 36 has a tip hook portion 21A
, A hand-operated rod (corresponding to an operating tool) 21 capable of forcibly operating the control valve 15 is locked, and the hand-operated rod 21 holds the hand grip 21B at the seedling rest 6.
It is configured to be supported by the body frame side guide plate 23 in the foreground. In other words, a linking operation mechanism is constituted by the pin 36 which interlocks and links the rod 22, the passive arm 19, and the hand operation rod 21, and thereby, the hand operation rod 21 and the elevation control mechanism 35 can be interlocked and linked. By the function of the operation mechanism 36, the passive arm 19 can be operated by the operation rod 21 at hand.

On the other hand, as shown in FIGS. 1 and 2, a pair of left and right support brackets 29,
29 and the holding arm 3 having a U-shaped cross section
0 is extended rearward toward the operating rod 20. The presser arm 30 makes contact with the operating rod 20 from above by bypassing below the horizontal support shaft 18. Further, the holding arm 30 is linked with a distal end hook portion 21A of the hand operation rod 21 by a tension spring 31.

Therefore, when the operating rod 21 is pulled forward, the pressing arm 30 is pressed against the operating rod 20 to prevent the operating rod 20 from lifting. Therefore, both grounding floats 7, which are linked to the operating rod 20,
7 cannot perform ascent operation. In other words, the ground floats 7, 7 become independent legs when the rice transplanter becomes independent on a road or the like. The presser arm 30, the tension spring 31, the hand operation rod 21, and the like are referred to as a lock mechanism 32 for restraining the operation of the operation rod 20.

However, since the hand operation rod 21 is also an operation lever for forcibly raising the wheels, the linkage with the operation on the lock mechanism 32 is as follows. As shown in FIG. 1, at a position corresponding to the guide plate 23 of the hand-operated rod 21, a hooking piece 33 is fixedly secured to an edge of a hole 23A of the guide plate 23. The hooking piece 33 has a stepped portion 33A in the middle. A locking groove 33B that is open downward is formed on the rear end side.

Therefore, as shown in FIG. 1, the engaging groove 33B is formed.
Is locked at the edge of the hole 23A, as shown in FIG. 3 (a), the distal end hook 21A of the hand-operated rod 21 can freely swing the passive arm 19 (that is, the control valve 15).
Since the tension spring 31 is in a contracted state, the pressing arm 30 does not press enough to restrict the free swing of the operating rod 20. That is, it is possible to bring the sensor float 7 up and down control.

Next, when the operation rod 21 is pulled forward from the state shown in FIG. 1 to lock the stepped portion 33A to the edge of the hole 23A of the guide plate 23, the distal end hook portion 21A of the operation rod 21 is pulled. And the control valve 15 can be forcibly maintained at the neutral position, and the extension spring 31 is operated to extend.
As in the state shown in FIG. 3B to the state shown in FIG. 3C, the lifting operation of the operating rod 20 is restricted by the presser arm 30, so that the self-standing posture of the traveling body by the sensor floats 7, 7 can be maintained. That is, the neutral lock state appears.

Further, by pulling the hand operation rod 21,
When the front end edge 33C of the hooking piece 33 is locked to the edge of the hole 23A of the guide plate 23, the control valve 15 is forcibly switched in the wheel descending direction, and enters a forced ascending state in which the body rises. In this case, the tension spring 31 is further pulled than in the neutral state of the control valve 15 described above, but the operating rod 20 serves as a stopper so that the holding arm 30 does not further descend.

[Another Embodiment] (a) The holding arm 30 and the planting clutch lever 34 are connected by a wire mechanism or the like, and the locking mechanism 32 is set when the planting clutch is released.
May be switched to the locked state, and the lock is released when the planting clutch is engaged. (B) The distal end hook portion 21A of the hand operation rod 21 may be directly linked to the drive arm 24 of the control valve 15. (C) The paddy field work machine may be a rice transplanter provided with a fertilizer application device. In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a plan view showing a lock mechanism for a lift control mechanism.

FIG. 2 is a side view of the lock mechanism.

FIG. 3 (a) is an operation diagram showing a lifting control state in which the operating rod is in a free state, FIG. 3 (b) is an operation diagram showing a state in which a lock mechanism acts on the operating rod, and (c) is an operating rod by the locking mechanism. Action diagram showing the state in which the ground is pushed down to lock the vertical movement of the ground float

FIG. 4 is an overall side view.

[Explanation of Codes] 7 Ground Float 8 Working Device 10 Propulsion Wheel 14 Drive Device 19 Passive Arm 20 Actuating Rod 21 Operation Tool 32 Lock Mechanism 35 Elevating Control Mechanism 36 Linkage Operation Mechanism

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

[Figure 3]

Claims (1)

[Claims] A single propulsion wheel (10) is attached to the traveling machine body by a drive device (14) so that it can be moved up and down freely, and propulsion is performed based on a lifting operation due to fluctuations in ground pressure of a pair of left and right ground floats (7), (7). A single-wheeled paddy working machine having a lifting control mechanism (35) for lifting and lowering a wheel (10) in a direction opposite to that of a grounding float (7) to maintain a constant ground height of a working device (8). The left and right ground floats (7) and (7) are independently provided so as to be vertically movable, and the left and right ends are respectively left and right ground floats (7) and (7).
To the operating rod (20) linked to the
0) lifting / lowering drive device (14) for passive arm (1
9) are linked and linked at the centers of both ends of the operating rod (20), and by the parallel raising and lowering movement of the operating rod (20) based on the same amount of vertical movement of the left and right ground floats (7), (7), A lifting control mechanism (35) is configured to operate the lifting drive device (14), and an operating rod (2
Lock mechanism (3) that acts on 0) to restrain the upward movement.
2) One-wheeled paddy work machine equipped with.