JP2001016909A - Work vehicle lifting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute the lifting structure for the working unit so that it may properly be switched to the lifting motion or to the descending motion in a working machine. SOLUTION: A manually operating tool 20 is provided that can be operated from the neutral position to the first direction, then be manually switched from the first direction to the reverse one. Further, this machine is equipped with a switching means 21 that can manually switch the operations of the machine between the first mode and the second mode where in the first mode, the working unit rises up to the preliminarily prescribed position, when the manually operating tool 20 is operated toward the first direction, the working unit descends down to the grounding position, when the manually operating tool 20 is operated to the second direction, and in the second mode, the lifting structure 7 is actuated to the lifting side, when the operating tool 20 is operated toward the first direction and maintained, and the lifting structure is actuated downward, when the tool 20 is operated to the second direction and maintained, and the lifting structure 7 is stopped, when the tool is operated to the neutral position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working vehicle elevating structure of a working vehicle in which a working device provided on an airframe is configured to be vertically driven by a lifting mechanism.

[0002]

2. Description of the Related Art In a riding type rice transplanter, which is an example of the work vehicle described above, a seedling planting device (corresponding to a working device) has an elevating mechanism as disclosed in, for example, Japanese Patent Application Laid-Open No. 5-219808. The lift lever (21 in FIG. 1 in the above-mentioned publication) is provided so as to be capable of driving up and down freely, and which is operated by an operator to operate a lifting mechanism. When the lifting lever is operated to the raising position, the lifting mechanism operates to the upward side, and when the lifting lever is operated to the neutral position, the lifting mechanism stops.When the lifting lever is operated to the lowering position, the lifting mechanism operates to the lower side, When the lifting lever is operated to the neutral position, the lifting mechanism stops. Thus, by operating the elevating lever to the ascending position, the descending position, and the neutral position, the seedling planting device can be moved up and down to an arbitrary height and stopped.

This riding type rice transplanter is provided with an elevating operation switch (SW1 in FIG. 1 of the above-mentioned publication) separately from the elevating lever. When the elevating operation switch is operated in a state where the seedling planter is lowered, When the raising / lowering mechanism is operated so that the seedling planting device rises to a predetermined position set in advance, and the raising / lowering operation switch is operated in a state where the seedling planting device is raised, the grounding position where the seedling planting device is grounded. The elevating mechanism operates so as to descend to

[0004] For example, when the planting process is completed and the airframe reaches the edge of the ridge and turns, operating the elevating operation switch raises the seedling planting device to a predetermined position. Operate the raising / lowering lever to the raising position to start raising the seedling planting device, and when the seedling planting device reaches the predetermined position, operate the raising / lowering lever from the raising position to the neutral position to move the seedling planting device to the predetermined position. There is no need to perform an operation such as stopping. This allows the raising and lowering switch to quickly operate the raising and lowering sides of the planting apparatus.

[0005]

As in the riding type rice transplanter described in "Prior Art", a lifting lever for raising and lowering the working device to an arbitrary height, and raising and lowering the working device to a predetermined position and a ground contact position. If the lifting operation switch is separately provided, the operator may be confused as to which of the lifting operation switch and the lifting lever should be operated.

[0006] Thus, when the working device is quickly operated to the ascending side, for example, at the time of turning on a ridge described in the "prior art", the lifting device is operated by mistake and the working device is operated. It is considered that the operation to the ascending side is delayed. Conversely, in the case of a work in which the working device is raised and lowered to an arbitrary height and stopped, it is conceivable that the raising and lowering operation switch is erroneously operated, and the working device is raised and lowered to a predetermined position and a ground position. Will be. SUMMARY OF THE INVENTION It is an object of the present invention to provide a work vehicle lifting and lowering structure for a work vehicle so that the work device can be appropriately operated on an ascending side and a descending side.

[0007]

According to the first aspect of the present invention, the working device is operated on the ascending side and the descending side, for example, at the time of turning on a ridge according to the "prior art". In such a case, the first state may be set by the switching means. Accordingly, when the artificial operation tool is operated in the first direction, the lifting mechanism operates so that the working device is raised to a predetermined position set in advance. When the artificial operation tool is operated in the second direction, the operation device is moved. The elevating mechanism operates so as to descend to the contact position where the contact is made.

Conversely, when the working device is raised and lowered to an arbitrary height and stopped, the second state may be set by the switching means. As a result, when the artificial operation tool is operated and held in the first direction, the elevating mechanism operates to the ascending side, and when the artificial operation tool is returned to the neutral position, the elevating mechanism stops.
When the artificial operation tool is operated and held in the second direction, the elevating mechanism operates downward, and when the artificial operation tool is returned to the neutral position, the elevating mechanism stops.

Thus, according to the first aspect of the present invention, in the first state in which the operation device is quickly operated to the upside and the downside, and in the second state in which the operation device is raised and lowered to an arbitrary height and stopped. Since the working device can be moved up and down by one artificial operation tool, if the necessary first or second state is set in advance in accordance with the work state, one artificial operation device is operated for elevating the working device. Just need. As a result, it is possible to avoid a situation in which the operator is confused as to which one of the lifting operation switch and the lifting lever should be operated, as in the configuration described in “Prior Art”.

[II] According to the features of the second, third and fourth aspects, similar to the case of the first aspect, the "action" described in the above [I] is provided, and in addition to this, the following " Action
It has. According to the features of claims 2, 3 and 4, since the manual operation tool is provided with a push operation switch as a switching means (because the switching means is operated by moving the artificial operation tool in the longitudinal direction). (Since the switching means is operated by rotating the grip portion of the artificial operation tool), the switching means can be operated with the hand holding the artificial operation tool, and the switching means disposed at a position away from the artificial operation tool It is not necessary to operate the means.

[III] According to the features of the fifth, sixth and seventh aspects, when the artificial operation tool is continuously operated twice in the first direction (when the artificial operation tool is operated in the first direction, it immediately returns to the neutral position). When the operation device is operated (when the artificial operation tool is operated beyond a predetermined position in the first direction), the lifting mechanism operates so that the working device is raised to a predetermined position set in advance, and the artificial operation device is moved in the second direction. (Continuously operating the artificial operating device in the second direction and immediately operating to the neutral position) (operating the artificial operating device beyond the predetermined position in the second direction)
The elevating mechanism operates so that the working device descends to the contact position where the work device contacts the ground.

Conversely, when the artificial operation tool is operated and held in the first direction (predetermined position in the first direction), the elevating mechanism operates to the ascending side, and when the artificial operating tool is returned to the neutral position, the elevating mechanism operates. When the artificial operation tool is operated and held in the second direction (a predetermined position in the second direction) and held, the elevating mechanism operates downward, and when the artificial operation tool is returned to the neutral position, the elevating mechanism stops. I do. Thus, the working device can be raised and lowered to an arbitrary height by the artificial operation tool and stopped.

According to the features of the fifth, sixth, and seventh aspects, the state in which the working device is quickly operated on the ascending side and the descending side, and the state in which the working device is raised and lowered to an arbitrary height and stopped. Since it is necessary to operate only one artificial operation tool for raising and lowering the working device, it is possible to obtain either one of the elevation operation switch and the elevation lever as described in the “prior art”. Should be operated, or a situation in which the operator is lost can be avoided.

[IV] According to the feature of claim 8, similar to the case of claim 7, the "action" described in the above-mentioned [III] is provided, and in addition, the following "action" is provided. ing. According to the feature of claim 8, when raising the working device to a predetermined position set in advance (when lowering the working device to a ground contact position where the working device is grounded), the artificial operation tool is moved to a predetermined position in the first direction (in the second direction). Operate beyond the specified position).

According to the eighth aspect of the present invention, when the artificial operation tool is operated beyond a predetermined position in the first direction (predetermined position in the second direction), the operation resistance becomes heavy, so that the operator can use the artificial operation tool. It can be easily recognized that the operating device is raised to a predetermined position (a state where the operating device is lowered to a ground contact position where the operating device is grounded) due to an increase in operation resistance when operating the device. it can.

[V] According to the ninth aspect of the present invention, when the artificial operating tool is operated in the upward direction, the lifting mechanism operates so that the working device is raised to a predetermined position set in advance. When the is operated downward, the elevating mechanism operates so that the working device descends to the contact position where the work device contacts the ground.

Conversely, if the artificial operating device is operated and held in one of the front and rear directions, the elevating mechanism operates to the ascending side, and when the artificial operating device is returned to the neutral position, the elevating mechanism stops. When the artificial operation tool is operated and held in the other direction in the front or rear direction, the elevating mechanism operates downward, and when the artificial operation tool is returned to the neutral position, the elevating mechanism stops. Thus, the working device can be raised and lowered to an arbitrary height by the artificial operation tool and stopped.

According to the ninth aspect of the present invention, the state in which the working device is quickly operated on the ascending side and the descending side, and the state in which the working device is raised and lowered to an arbitrary height and stopped, are one man-made state. Since it can be obtained by an operating tool and only one artificial operating tool needs to be operated for lifting and lowering of the working device, which of the lifting operation switch and the lifting lever should be operated as in the configuration described in “Prior art” In addition, it is possible to avoid a situation where the operator is lost.

According to a ninth aspect of the present invention, a state in which the operation of the working device is quickly raised and lowered and a state in which the working device is raised and lowered to an arbitrary height and stopped are operated by one artificial operation tool. In the case of obtaining, since the operation direction of the artificial operating tool in both the above-mentioned states is different, when the artificial operating tool is operated to obtain both of the above-mentioned states, when the one of the states is obtained, the The number of situations where the operation of the operating tool is erroneously made to appear in the other state is reduced.

In this case, the upward operation of the manipulating device corresponds to a state in which the operation device is quickly moved upward.
Since the downward operation of the artificial operation device corresponds to the state in which the operation device is quickly moved to the lower side, the operation feeling of the operator corresponds to the operation of the operation device to the upper side and the lower side. ing.

[VI] According to the feature of claim 10, when the artificial operating tool is operated upward in a state where the artificial operating tool is operated to one of the front side and the rear side position, the working device is preset. The elevating mechanism operates so as to ascend to the predetermined position. When the artificial operation tool is operated in the downward direction, the elevating mechanism operates so as to descend to the contact position where the working device contacts the ground.

Conversely, if the artificial operation tool is operated and held upward in the state where the artificial operation tool is operated to the other of the front side or the rear side position, the elevating mechanism operates upward and the manual operation is performed. When the tool is returned to the other of the front or rear positions (neutral position), the elevating mechanism stops. If the manipulating tool is operated and held downward, the elevating mechanism operates to the descending side. When the operating tool is returned to the other of the front side or the rear side position (neutral position), the elevating mechanism stops. Thus, the working device can be raised and lowered to an arbitrary height by the artificial operation tool and stopped.

Thus, according to the features of claim 10,
A state in which the operation of the working device on the ascending side and the descending side is quickly performed, and a state in which the working device is raised and lowered to an arbitrary height and stopped can be obtained by one artificial operation tool,
Since it is only necessary to operate one artificial operation tool for raising and lowering the working device, if the operator is confused as to which of the lifting operation switch and the lifting lever should be operated as in the configuration described in “Prior Art” You can avoid such situations.

According to a tenth aspect of the present invention, the state in which the operation of the working device is quickly raised and lowered and the state in which the working device is raised and lowered to an arbitrary height and stopped are controlled by one artificial operation tool. When obtaining the two states, the positions (front and rear positions) of the artificial operating tools when obtaining both of the above-mentioned states are different. When obtaining, the situation in which the operation of the artificial operation tool is erroneously made to appear in the other state is reduced.

In this case, the upward operation of the artificial operation tool corresponds to a state in which the operation device is quickly moved upward and a state in which the operation device is raised to an arbitrary height and stopped.
The downward operation of the artificial operating device corresponds to the state in which the operating device is quickly moved to the descending side and the state in which the operating device is lowered to an arbitrary height and stopped. Operations on the ascending side and the descending side of the working device correspond to each other.

[VII] According to the feature of claim 11, as in the case of any one of claims 1 to 10, the "action" described in the above items [I] to [VI] is provided. In addition to the above, the following “action” is provided. Claim 1
According to the feature of 1, since an artificial operation tool is provided in the vicinity of the steering handle for performing the steering operation of the aircraft, when the operator manually operates the artificial operation tool while holding the steering handle, By slightly moving the hand holding the steering wheel, the artificial operation tool can be operated.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an engine 3 and a driving unit 4 are provided on a body supported by a front wheel 1 and a rear wheel 2 which can be steered right and left. Parallel 4
A seedling planting device 6 is connected via a link mechanism 5 so as to be able to move up and down, and a hydraulic cylinder 7 that drives the link mechanism 5 to move up and down.
Are provided to constitute a riding type rice transplanter which is an example of a work vehicle.

As shown in FIG. 1, the seedling planting device 6 includes a seedling rest 8, which is driven to reciprocate and traverses at a predetermined stroke, a planting transmission case 9, and a rotation driven at the rear of the planting transmission case 9. The case 10 includes a pair of planting claws 11 supported by the rotating case 10, a plurality of floats 12, and the like. The seedlings are alternately taken out and planted on the rice field G.

As shown in FIG. 2, the left and right center floats 1
2 is pivotally supported about a horizontal axis P1 and provided with a potentiometer 14 for detecting the position of the front portion of the float 12 with respect to the seedling planting device 6, and the detected value of the potentiometer 14 is used as a control device 15 Has been entered. The hydraulic cylinder 7 is provided with an electromagnetically operated control valve 13 that operates to supply and discharge hydraulic oil to the ascending side and the descending side, and the control device 15 is configured to operate the control valve 13. .

When the seedling planting device 6 moves up and down with respect to the rice field G while the float 12 follows the ground surface G, the detection value of the potentiometer 14 changes. The control valve 13 is operated by 15 and the hydraulic cylinder 7 expands and contracts, and the seedling planting device 6 is automatically driven up and down so that the detection value of the potentiometer 14 is maintained at the set value (automatic up / down control). . Thereby, the seedling planting apparatus 6 is maintained at the set height from the rice field G, and the planting depth of the seedling by the planting claws 11 is maintained at the set value.

A planting clutch 16 is provided to transmit and cut off the power of the engine 3 to the seedling planting device 6, and the motor 1 operates the planting clutch 16 to the transmission side and the transmission interruption side.
7 are provided, and the motor 17 is
Is configured to be operated. Upper limit sensor 2 for detecting that the link mechanism 5 has reached the mechanical upper limit position
4 is provided so that a signal from the upper limit sensor 24 is input to the control device 15.

As shown in FIGS. 2 and 1, a steering wheel 18 and a driver's seat 19 for steering the front wheel 1 right and left.
Are provided in the driving unit 4. An elevating lever 20 operable to a neutral position N, an upward position U upward from the neutral position N, and a downward position D downward from the neutral position N is provided on the lower right side of the steering handle 18. Is input to the control device 15. Lift lever 2
0 is urged to the neutral position N, and when the lift lever 20 is released in a state where the lift lever 20 is operated to the ascending position U and the descending position D, the elevating lever 20 automatically returns to the neutral position N.

A changeover switch 21 for setting a first state and a second state, which will be described later, is provided. A signal of the changeover switch 21 is input to the control device 15, and the first and second states are set. Are displayed on the control panel 23 provided with the control handle 18.

Next, the seedling planting device 6 using the lifting lever 20
The case where the first state is set by the changeover switch 21 with respect to the elevation will be described with reference to FIG. If the changeover switch 21 is set to the first state (step S1),
The first display lamp 22a is turned on (step S2), and the operator of the driving unit 4 recognizes that the state is the first state (second state).
The display lamp 22b turns off).

For example, the planting operation state in which the seedling planting device 6 is automatically driven up and down so as to be maintained at the set height from the rice field G (automatic up / down control), and the planting clutch 16 is operated to the transmission side. (Steps S13, S14, S1 to be described later)
5) In the state where the first state is set, when the elevating lever 20 is operated to the ascending position U (step S3), the planting clutch 16 is operated by the motor 17 to the transmission interruption side (step S4), and the automatic operation is performed. Elevation control stops and control valve 13
Is operated on the ascending side, the hydraulic cylinder 7 operates on the ascending side, and the seedling planting device 6 ascends (step S5). In this case, even if the lifting lever 20 is held at the lifting position U,
Even if the raising / lowering lever 20 is operated to the raising position U and then returned to the neutral position N, the raising of the seedling planting device 6 is continued.

As a result, when the link mechanism 5 reaches the upper limit position and this is detected by the upper limit sensor 24 (step S7), the control valve 13 is operated to the neutral position, the hydraulic cylinder 7 is stopped, and the seedling plant 6 Automatically stops at the upper limit position (step S8). Thus, the lifting lever 20
Is moved to the ascending position U, the seedling planting device 6 can be raised at a stretch to the upper limit position.

When the raising / lowering lever 20 is moved to the lowering position D before the seedling planting device 6 reaches the upper limit position while the seedling planting device 6 is being raised (step S6), the control valve 13 is operated to the neutral position. Then, the hydraulic cylinder 7 stops, and the seedling planting device 6 stops at that position (step S8). In this case, even if the elevating lever 20 is held at the lowering position D, or if the elevating lever 20 is operated to the lowering position D and then returned to the neutral position N,
Seedling plant 6 stops at that position.

After the seedling planting device 6 has stopped,
When the elevating lever 20 is operated to the ascending position U, the process proceeds to steps S3, S4, and S5, and the seedling planting device 6 ascends. After the seedling planting device 6 stops, the elevating lever 20 is moved to the descending position D. Is operated, steps S3 and S
9 and the seedling planting apparatus 6 descends.

Next, when the raising / lowering lever 20 is operated to the lowering position D with the seedling planting device 6 raised (step S).
3), the control valve 13 is operated on the descending side, the hydraulic cylinder 7 is operated on the descending side, and the seedling planting apparatus 6 descends (step S9). In this case, even if the elevating lever 20 is held at the lowering position D, the lowering of the seedling planting device 6 is continued even if the elevating lever 20 is operated to the lowering position D and then returned to the neutral position N.

When the float 12 comes in contact with the rice field G by the lowering of the seedling planting device 6 (step S12),
In the state where the float 12 is rising from the rice field G, the float 12 is lowered to its lower limit by its own weight. However, when the float 12 touches the rice field G, the float 12 is lifted from the lower limit, and this state is detected by the potentiometer 14. Since it is determined that the float 12 has touched the rice field G), the automatic raising and lowering control is started and the seedling planting apparatus 6 is automatically driven to raise and lower so as to be maintained at the set height from the rice field G. The seedling planting device 6 stops at the position where the float 12 touches the rice field G (step S13). By operating the raising / lowering lever 20 to the lowering position D in this manner, the seedling planting device 6 is moved until the float 12 touches the rice field G.
Can be lowered at a stretch.

Next, when the raising / lowering lever 20 is returned to the neutral position N and then operated again to the lowering position D (step S1).
4) The planting clutch 16 is operated to the transmission side by the motor 17 (step S15), and the planting operation state is resumed. When the elevating lever 20 is operated to the ascending position U (step S14), the process proceeds to step S4.

After the step S9, before the float 12 touches the rice field G while the seedling planting apparatus 6 is descending, the lifting lever 2
When 0 is moved to the ascending position U (step S10), the control valve 13 is operated to the neutral position and the hydraulic cylinder 7 stops, and the seedling plant 6 stops at that position (step S10).
8). In this case, even if the elevating lever 20 is held at the elevating position U, or if the elevating lever 20 is operated to the elevating position U and then returned to the neutral position N, the seedling plant 6 stops at that position. When the elevating lever 20 is operated to the ascending position U after the seedling planting device 6 is stopped in this way, step S3,
The process proceeds to S4 and S5, and the seedling planting device 6 is raised. When the raising / lowering lever 20 is operated to the lowering position D after the seedling planting device 6 is stopped, the process proceeds to steps S3 and S9 and the seedling is planted. The attachment device 6 descends.

After the step S9, before the float 12 comes in contact with the rice field surface G while the seedling planting apparatus 6 is descending, the lifting lever 2
When 0 is returned to the neutral position N and then moved to the lowering position D (step S10), the planting clutch 16 is operated to the transmission side by the motor 17 while the seedling planting device 6 is moving down (step S11). ), And proceeds to steps S12 and S13. Therefore, if the shutoff valve (not shown) provided in the hydraulic oil supply system to the hydraulic cylinder 7 is closed after step S10 and before step S11, the planting clutch 1
The seedling planting device 6 can be stopped in a state where the transmission 6 is operated on the transmission side. Thus, for example, on a road, the seedling planting device 6 is operated while the planting clutch 16 is operated to the transmission side.
Is stopped at a position slightly higher than the ground, the rotating case 10 and the planting claw 11 are idled without planting the seedlings, the amount of the seedlings taken out of the planting claw 11 is adjusted, and each part of the seedling planting device 6 is adjusted. Adjustments can be made.

Next, the seedling planting device 6 using the lifting lever 20
The case where the second state is set by the changeover switch 21 with respect to the vertical movement will be described with reference to FIG. When the changeover switch 21 is set to the second state (step S1),
The second display lamp 22b lights up (step S16),
The operator of the driving unit 4 recognizes the second state (the first display lamp 22a is turned off).

For example, the planting operation state in which the seedling planting device 6 is automatically driven up and down so as to be maintained at the set height from the rice field surface G (automatic up / down control), and the planting clutch 16 is operated to the transmission side. (Steps S24, S25, S2 to be described later)
6), in the state where the second state is set, when the elevating lever 20 is operated and held at the ascending position U (step S17), the planting clutch 16 is operated by the motor 17 to the transmission interruption side (step S18). ), The automatic elevating control is stopped, the control valve 13 is operated on the ascending side, the hydraulic cylinder 7 is operated on the ascending side, and the seedling planting device 6 is ascended (step S).
19).

When the lift lever 20 is returned from the raised position U to the neutral position N with the float 12 raised from the rice field G (step S17), the control valve 13 is operated to the neutral position and the hydraulic cylinder 7 is stopped. Then, the seedling planting apparatus 6 stops at that position (step S21). When the elevating lever 20 is operated and held at the lowering position D (step S17), the control valve 13 is operated on the lower side, the hydraulic cylinder 7 is operated on the lower side, and the seedling planting device 6 is lowered. (Step S22), the elevating lever 20 is lowered to the lower position D
When the control valve 13 is returned to the neutral position N (step S17), the control valve 13 is operated to the neutral position and the hydraulic cylinder 7 stops,
The seedling plant 6 stops at that position (step S2).
1).

When the link mechanism 5 reaches the upper limit position and the upper limit sensor 24 detects that the link mechanism 5 has reached the upper limit position in the state where the lift lever 20 is operated and held at the upper position U (step S20), the control valve 13 moves to the neutral position. , The hydraulic cylinder 7 stops, and the seedling planting device 6 automatically stops at the upper limit position (step S21). By operating the raising / lowering lever 20 to the raising position U, the lowering position D and the neutral position N in this way, the seedling planting apparatus 6 can be raised and lowered to an arbitrary height and stopped.

In a state where the raising / lowering lever 20 is operated and held at the lowering position D, the float 12 comes into contact with the rice field G by the lowering of the seedling planting device 6 (step S2).
3), the automatic elevating control is started, and the seedling planting device 6
Is automatically driven so as to be maintained at the set height from the above, so that the seedling planting device 6 stops at the position where the float 12 contacts the rice field G (step S2).
4).

Next, when the raising / lowering lever 20 is returned to the neutral position N and then operated again to the lowering position D (step S2).
5) The planting clutch 16 is operated to the transmission side by the motor 17 (step S26), and the planting operation state is resumed. When the elevating lever 20 is operated to the ascending position U (step S25), the process proceeds to steps S17 and S18.

[First Embodiment of the Invention] Instead of the changeover switch 21 shown in FIG. 2, the changeover switch 21 is configured as a push-on / push-off type push operation switch,
As shown in FIG. 5, the changeover switch 21 of the push operation switch
May be provided at the tip of the lifting lever 20.

[Second Alternative Embodiment of the Invention] The changeover switch 21 shown in FIG. 2 is disposed inside the elevating lever 20, and the elevating lever 20 is moved in the longitudinal direction (see the left and right direction in FIG. 5). The first and second states may be set by operating the changeover switch 21 by pushing the elevating lever 20 in the longitudinal direction so that the first and second states are set.

[Third Alternative Embodiment of the Invention] The changeover switch 21 shown in FIG. 2 is disposed inside the elevating lever 20, and the grip portion 20a (see FIG. 2) of the elevating lever 20 is moved in the longitudinal direction (see FIG. 5). (See the left-right direction) so as to be rotatable around the axis, and by operating the grip portion 20a of the elevating lever 20 by a predetermined angle, the changeover switch 21 is operated, and the first and second states are switched. It may be configured to be set.

[Fourth Embodiment of the Invention] The changeover switch 21 shown in FIG. 2 is eliminated, and the raising and lowering of the seedling planting device 6 by the raising and lowering lever 20 is configured as shown in FIGS. 6 and 7. Is also good. For example, the raising and lowering lever is automatically driven so that the seedling planting device 6 is maintained at the set height from the rice field surface G (automatic raising and lowering control). 20 is operated to the ascending position U, returned to the neutral position N side, and operated to the ascending position U again (a state in which the ascending position U is continuously operated twice) (step S
3, S32, S33), and similarly to steps S4 and S5 in FIG. 3 in [Embodiment of the invention], the planting clutch 16 is operated by the motor 17 to the transmission cut-off side, the automatic elevating control is stopped, and the control valve 13 is stopped. Is operated on the ascending side, the hydraulic cylinder 7 operates on the ascending side, and the seedling planting device 6 ascends.

The lifting lever 20 is operated to the lifting position U,
When the lever is returned to the neutral position N and is operated to the ascending position U again, even if the elevating lever 20 is thereafter held at the ascending position U, the elevating lever 20 is operated to the ascending position U and then to the neutral position N. Even if it is returned, the raising of the seedling planting device 6 is continued. The state in which the seedling planting apparatus 6 thereafter automatically stops at the upper limit position, and the state in which it stops before reaching the upper limit position, is as follows.
Steps S6 and S in FIG. 3 in [Embodiment of the invention]
7. Same as S8.

Next, when the raising and lowering lever 20 is operated to the lowering position D with the seedling planting device 6 raised, and is returned to the neutral position N and is again operated to the lowering position D (continuously to the lowering position D). Is operated twice) (steps S31, S34,
S35), similarly to step S9 of FIG. 3 in [Embodiment of the invention], the control valve 13 is operated to the lower side, the hydraulic cylinder 7 is operated to the lower side, and the seedling planting device 6 is lowered.

The lifting lever 20 is operated to the lowering position D,
When the lever is returned to the neutral position N and operated again to the lowering position D, even if the elevator lever 20 is thereafter held at the lowering position D, the elevator lever 20 is operated to the lowering position D and then to the neutral position N. Even if it is returned, the lowering of the seedling planting device 6 is continued. The state in which the float 12 comes into contact with the rice paddle G and the automatic raising / lowering control is started thereafter, the operation of the planting clutch 16 to the transmission side, and the seedling planting apparatus 6 stops before the float 12 comes into contact with the rice paddle G. The state is the same as Steps S10 to S15 in FIG. 3 in [Embodiment of the Invention].

In the state where the seedling planting device 6 is stopped before reaching the upper limit position and the state where the seedling planting device 6 is stopped before the float 12 touches the rice field surface G, the raising / lowering lever 20 is raised as described above. When operated to U (down position D), returned to the neutral position N side, and operated again to the up position U (down position D), the seedling planting device 6 is raised (down) as described above.
When the raising / lowering lever 20 is operated and held at the raising position U (lowering position D), the seedling planting device 6 is raised (lowered) as described later.

For example, the planting operation state in which the seedling planting device 6 is automatically driven up and down so as to be maintained at the set height from the rice field G (automatic up / down control), and the planting clutch 16 is operated to the transmission side. When the lifting lever 20 is operated to the rising position U and is not returned to the neutral position N and is held at the rising position U (from steps S31 and S32 to FIG. 7), FIG. Steps S18, S19, S21
In the same manner as described above, the planting clutch 16 is operated to the transmission cut-off side by the motor 17, the automatic elevating control is stopped, the control valve 13 is operated to the ascending side, the hydraulic cylinder 7 is operated to the ascending side, and Rises and the elevating lever 20 is returned from the ascending position U to the neutral position N, the control valve 13 is operated to the neutral position, and the hydraulic cylinder 7 is stopped.
Stops. The subsequent state in which the seedling planting apparatus 6 automatically stops at the upper limit position is the same as Steps S20 and S21 in FIG. 4 in [Embodiment of the Invention].

Next, when the raising and lowering lever 20 is operated to the lowering position D in a state where the seedling planting device 6 is raised, the lowering position D is maintained without returning to the neutral position N side (Steps S31 and S31).
Similarly to steps S22 and S21 in FIG. 4 in FIGS. 34 to 7) and [Embodiment of the invention], the control valve 13 is operated on the descending side, and the hydraulic cylinder 7 is actuated on the descending side. When the lifting lever 20 is lowered and the lifting lever 20 is returned from the lowering position D to the neutral position N, the control valve 13 is operated to the neutral position and the hydraulic cylinder 7 is stopped.
Stops. After that, the state in which the float 12 touches the rice field surface G and the automatic raising / lowering control is started, and the operation of the planting clutch 16 to the transmission side is the same as that in steps S23 to S26 in FIG. is there.

[Fifth Embodiment of the Invention] The changeover switch 21 shown in FIG. 2 may be omitted, and the raising and lowering of the seedling planting apparatus 6 by the raising and lowering lever 20 may be configured as shown in FIG.
For example, the raising and lowering lever is automatically driven so that the seedling planting device 6 is maintained at the set height from the rice field surface G (automatic raising and lowering control). 20 is operated to the ascending position U and immediately returned to the neutral position N before the set time elapses (step S4).
1, S42, S43, S44), [Embodiment of the invention]
As in steps S4 and S5 in FIG.
As a result, the planting clutch 16 is operated to the transmission interruption side, the automatic elevating control is stopped, the control valve 13 is operated to the ascending side, the hydraulic cylinder 7 is operated to the ascending side, and the seedling planting device 6 is ascended. The subsequent state in which the seedling planting device 6 automatically stops at the upper limit position and the state in which the seedling plant stops before reaching the upper limit position are described in [Embodiments of the Invention] in steps S6, S7, and S7 in FIG.
Same as S8.

Next, when the raising / lowering lever 20 is operated to the lowering position D with the seedling planting device 6 being raised, and is returned to the neutral position N immediately before the set time elapses (step S4).
1, S45, S46, S47), [Embodiment of the invention]
3, the control valve 13 is operated on the descending side, the hydraulic cylinder 7 is actuated on the descending side, and the seedling planting apparatus 6 descends. The state in which the float 12 comes into contact with the rice paddle G and the automatic raising / lowering control is started thereafter, the operation of the planting clutch 16 to the transmission side, and the seedling planting apparatus 6 stops before the float 12 comes into contact with the rice paddle G. The state is the same as Steps S10 to S15 in FIG. 3 in [Embodiment of the Invention].

In the state where the seedling planting device 6 is stopped before reaching the upper limit position and the state where the seedling planting device 6 is stopped before the float 12 touches the rice field G, the raising / lowering lever 20 is raised as described above. When operated to U (down position D) and immediately returned to the neutral position N before the set time elapses,
The seedling planting device 6 is raised (downward) as described above. When the raising / lowering lever 20 is operated and held at the rising position U (downward position D), the seedling planting device 6 is moved as described later. It is raised (falled).

For example, the seedling planting apparatus 6 is automatically driven up and down so as to be maintained at a set height from the rice field G (automatic up / down control), and the planting clutch 16 is operated on the transmission side in the planting operation state. When the elevating lever 20 is operated to the ascending position U and is not returned to the neutral position N but is held at the ascending position U (steps S41, S42, S43, S44), the same as in the fourth embodiment of the present invention, FIG. 7, when the elevating lever 20 is returned from the ascending position U to the neutral position N, the process proceeds to FIG. 7 similarly to the fourth embodiment of the present invention.

Next, when the raising and lowering lever 20 is operated to the lowering position D and is not returned to the neutral position N and is held at the lowering position D in a state where the seedling planting device 6 is raised (steps S41 and S4).
5, S46, S47), as in [Fourth Embodiment of the Invention], the process proceeds to FIG. 7, and when the elevating lever 20 is returned from the lower position D to the neutral position N, the fourth embodiment of the invention is performed. ]
The process proceeds to FIG.

[Sixth Embodiment of the Invention] The changeover switch 21 shown in FIG. 2 is eliminated, and the raising and lowering of the seedling planting device 6 by the raising and lowering lever 20 is configured as shown in FIGS. 9 and 10. Is also good. As shown in FIG. 9, the raising / lowering lever 20 is moved from the neutral position N, the second raising position U2 and the first raising position U1 upward from the neutral position N, the second lowering position D2 from the neutral position N and the first lowering position. The lifting lever 20 is configured to be operable at the position D1 and the lifting lever 20 is moved from the second rising position U2 to the first rising position U1 more than the operating resistance when operating from the neutral position N to the second rising position U2 (second falling position D2). The operation resistance when operating from (the second lowering position D2 to the first lowering position D1) becomes heavy. The lifting lever 20 is biased to the neutral position N, and the second and first lifting positions U2, U1,
When the user lifts the lifting lever 20 while operating the first lowering position D2 or D1, the lifting lever 20 automatically returns to the neutral position N.

As shown in FIG. 10, for example,
Is automatically driven up and down so as to be maintained at a set height from the rice field surface G (automatic up / down control), and in the planting operation state in which the planting clutch 16 is operated on the transmission side, the lifting lever 20 is moved to the first raising position. When U1 is operated (step S51), the planting clutch 16 is operated by the motor 17 to the transmission interruption side, and the automatic lifting control is stopped, as in steps S4 and S5 in FIG. Then, the control valve 13 is operated to the ascending side, the hydraulic cylinder 7 is operated to the ascending side, and the seedling planting device 6 is ascended.

Even if the elevating lever 20 is moved to the first ascending position U1, the second elevating lever 20 is operated to the first ascending position U1 even if the elevating lever 20 is held at the first ascending position U1. Even if it returns to the raising position U2 or the neutral position N, the raising of the seedling planting apparatus 6 is continued. The state where the seedling planting apparatus 6 thereafter automatically stops at the upper limit position and the state where it stops before reaching the upper limit position are described in [Embodiment of the invention].
Are the same as steps S6, S7 and S8 in FIG.

Next, when the raising and lowering lever 20 is operated to the first lowering position D1 with the seedling planting device 6 raised (step S51), as in step S9 of FIG. Then, the control valve 13 is operated on the lower side, the hydraulic cylinder 7 is operated on the lower side, and the seedling plant 6 is lowered.
After the lifting lever 20 is operated to the first lowering position D1,
Even if the elevating lever 20 is held at the first lowering position D1, even if the elevating lever 20 is operated to the first lowering position D1 and then returned to the second lowering position D2 or the neutral position N, the seedling plant 6 Descent continues. Float 12 after this
The state in which the automatic climbing control is started by touching the rice field G, the operation of the planting clutch 16 to the transmission side, and the state in which the seedling planting apparatus 6 stops before the float 12 touches the rice field G are described in [Invention]. Embodiment] of FIG. 3 in steps S10 to S1
Same as 5.

In the state where the seedling planting device 6 is stopped before reaching the upper limit position and in the state where the seedling planting device 6 is stopped before the float 12 touches the rice field G, the raising / lowering lever 20 is moved to the first position as described above. When operated to the ascending position U1 (first descending position D1), the seedling planting device 6 ascends (descends) as described above.
The lifting lever 20 is moved to the second raising position U2.
When operated and held at the (second lowering position D2), the seedling planting device 6 is raised (downward) as described later.

For example, the seedling planting apparatus 6 is automatically driven up and down so as to be maintained at the set height from the rice field G (automatic up / down control), and the planting clutch 16 is operated on the transmission side in the planting operation state. When the elevating lever 20 is operated and held at the second ascent position U2 (step S51), the process proceeds to FIG. 7 similarly to the [fourth embodiment of the invention], and the elevating lever 20 is moved to the second ascending position. When returning to the neutral position N from U2, the process proceeds to FIG. 7 as in the [fourth embodiment of the present invention].

Next, when the raising and lowering lever 20 is operated and held at the second lowering position D2 in a state where the seedling planting device 6 is raised (step S51), similarly to the [fourth embodiment of the present invention]. 7, when the lifting lever 20 is returned from the second lowering position D2 to the neutral position N, [Fourth Embodiment of the Invention]
Mode], the process proceeds to FIG.

[Seventh Embodiment of the Invention] The changeover switch 21 shown in FIG. 2 is eliminated, and the raising and lowering of the seedling planting device 6 by the raising and lowering lever 20 is configured as shown in FIGS. 11 and 12. Is also good. As shown in FIG. 11, the elevating lever 20 is moved from the neutral position N to a first ascending position U1 upward from the neutral position N,
First downward position D1, downward from neutral position N, neutral position N
From the neutral position N to the second upward position U2 in the forward direction, and from the neutral position N to the second downward position D2 in the backward direction.
The lifting lever 20 is biased to the neutral position N, and the first and second lifting positions U1, U2, the first and second lowering positions D
When the hand is released from the elevating lever 20 in the state where the operation is performed at D1, D2, the elevating lever 20 automatically returns to the neutral position N.

As shown in FIG. 12, for example,
Is automatically driven up and down so as to be maintained at a set height from the rice field surface G (automatic up / down control), and in the planting operation state in which the planting clutch 16 is operated on the transmission side, the lifting lever 20 is moved to the first raising position. When U1 is operated (step S61), the planting clutch 16 is operated to the transmission interruption side by the motor 17, and the automatic lifting / lowering control is stopped, similarly to steps S4 and S5 in FIG. Then, the control valve 13 is operated to the ascending side, the hydraulic cylinder 7 is operated to the ascending side, and the seedling planting device 6 is ascended.

Even if the lifting lever 20 is held at the first raising position U1 after the lifting lever 20 is moved to the first raising position U1, the neutral position is reached after the lifting lever 20 is moved to the first raising position U1. Even if it returns to N, the raising of the seedling planting apparatus 6 will be continued. The subsequent state in which the seedling planting apparatus 6 automatically stops at the upper limit position and the state in which it stops before reaching the upper limit position are the same as steps S6, S7, and S8 in FIG. 3 in [Embodiment of the Invention]. is there.

Next, when the raising / lowering lever 20 is operated to the first lowering position D1 with the seedling planting device 6 raised (step S61), as in step S9 of FIG. Then, the control valve 13 is operated on the lower side, the hydraulic cylinder 7 is operated on the lower side, and the seedling plant 6 is lowered.
After the lifting lever 20 is operated to the first lowering position D1,
Even if the elevating lever 20 is held at the first lowering position D1, even if the elevating lever 20 is operated to the first lowering position D1 and then returned to the neutral position N, the lowering of the seedling planting device 6 is continued. . The state in which the float 12 comes into contact with the rice paddle G and the automatic raising / lowering control is started thereafter, the operation of the planting clutch 16 to the transmission side, and the seedling planting apparatus 6 stops before the float 12 comes into contact with the rice paddle G. The state is the same as Steps S10 to S15 in FIG. 3 in [Embodiment of the Invention].

In the state where the seedling planting apparatus 6 is stopped before reaching the upper limit position and the state where the seedling planting apparatus 6 is stopped before the float 12 touches the rice field G, as described above, the lifting lever 20 is moved to the first position. When operated to the ascending position U1 (first descending position D1), the seedling planting device 6 ascends (descends) as described above.
The lifting lever 20 is moved to the second raising position U2.
When operated and held at the (second lowering position D2), the seedling planting device 6 is raised (downward) as described later.

For example, the seedling planting device 6 is automatically driven up and down so as to be maintained at the set height from the rice field G (automatic up / down control), and the planting clutch 16 is operated on the transmission side in the planting operation state. When the elevating lever 20 is operated and held at the second ascending position U2 (step S61), the process proceeds to FIG. 7 similarly to the [fourth embodiment of the invention], and the elevating lever 20 is moved to the second ascending position. When returning to the neutral position N from U2, the process proceeds to FIG. 7 as in the [fourth embodiment of the present invention].

Next, when the raising and lowering lever 20 is operated and held at the second lowering position D2 in a state where the seedling planting device 6 is raised (step S61), similarly to the [fourth embodiment of the present invention]. 7, when the lifting lever 20 is returned from the second lowering position D2 to the neutral position N, [Fourth Embodiment of the Invention]
Mode], the process proceeds to FIG.

In this case, the second rising position U2 shown in FIG.
And the second descending position D2 is exchanged so that the first ascending position U1 is upward from the neutral position N, the first descending position D1 is downward from the neutral position N, and the second is forward from the neutral position N.
Lowering position D2, second raising position U in the backward direction from neutral position N
2 may be arranged. First and second raised positions U1, U2, and first and second lowered positions D1, D shown in FIG.
2, the second rising position U2 upward from the neutral position N, the second descending position D2 downward from the neutral position N, the first rising position U1, the neutral position N forward from the neutral position N. , It is also possible to set the first descending position D1 backward.

[Eighth Embodiment of the Invention] The changeover switch 21 shown in FIG. 2 is eliminated, and the raising and lowering of the seedling planting device 6 by the raising and lowering lever 20 is configured as shown in FIGS. 13 and 14. Is also good. As shown in FIG. 13, the lifting lever 20 is configured to be freely operable between a first neutral position N1 at a rear position and a second neutral position N2 at a front position, and a first upward position U1 upward from the first neutral position N1. A first downward position D1 downward from the first neutral position N1, a second upward position U2 upward from the second neutral position N2, and a second downward position D2 downward from the second neutral position N2 in an H-shape. Operate freely. Lifting lever 20
Is biased to the first and second neutral positions N1 and N2,
When the user lifts his / her hand from the lifting / lowering lever 20 in a state where it has been operated to the first raising position U1 and the first lowering position D1, the second raising position U2, and the second lowering position D2, the raising / lowering lever 20 automatically becomes the first
And return to the second neutral position N1, N2.

As shown in FIG. 14, for example, a seedling plant 6
Is automatically driven so as to be maintained at a set height from the rice field surface G (automatic elevating control), and in the planting operation state in which the planting clutch 16 is operated on the transmission side, the lifting lever 20 is in the first neutral position. In the state of being located at N1 (step S7
1) When the elevating lever 20 is operated to the first ascending position U1 (step S72), the planting clutch 16 is transmitted by the motor 17 as in steps S4 and S5 in FIG. When the operation is performed to the shutoff side, the automatic elevating control is stopped, the control valve 13 is operated to the ascending side, the hydraulic cylinder 7 is operated to the ascending side, and the seedling planting device 6 is ascended.

Even if the elevating lever 20 is moved to the first ascending position U1, the first elevating lever 20 is moved to the first ascending position U1 even if the elevating lever 20 is held at the first ascending position U1. Even if it returns to the neutral position N1, the raising of the seedling planting apparatus 6 is continued. The subsequent state in which the seedling planting apparatus 6 automatically stops at the upper limit position and the state in which it stops before reaching the upper limit position are the same as steps S6, S7, and S8 in FIG. 3 in [Embodiment of the Invention]. is there.

Next, when the raising / lowering lever 20 is operated to the first lowering position D1 with the seedling planting device 6 raised (step S72), similarly to step S9 of FIG. 3 in the embodiment of the present invention. Then, the control valve 13 is operated on the lower side, the hydraulic cylinder 7 is operated on the lower side, and the seedling plant 6 is lowered.
After the lifting lever 20 is operated to the first lowering position D1,
Even if the elevating lever 20 is held at the first lowering position D1, the lowering of the seedling planting device 6 continues even if the elevating lever 20 is operated to the first lowering position D1 and then returned to the first neutral position N1. Is done. After this, the float 12 comes into contact with the rice field surface G to start the automatic lifting / lowering control.
The operation on the transmission side and the state where the seedling planting device 6 stops before the float 12 touches the rice field G are the same as Steps S10 to S15 in FIG. 3 in [Embodiment of the Invention].

As described above, in the state where the seedling planting device 6 is stopped before reaching the upper limit position and the state where the seedling planting device 6 is stopped before the float 12 touches the rice field G, the raising / lowering lever 20 is moved to the first position. When operated to the ascending position U1 (first descending position D1), the seedling planting device 6 ascends (descends) as described above.
The lifting lever 20 is moved to the second raising position U2.
When operated and held at the (second lowering position D2), the seedling planting device 6 is raised (downward) as described later.

For example, the seedling planting device 6 is automatically driven up and down so as to be maintained at the set height from the rice field G (automatic up / down control), and the planting clutch 16 is operated on the transmission side in the planting operation state. In a state where the lifting lever 20 is located at the second neutral position N2 (step S71), the lifting lever 20
Is operated and held at the second ascending position U2 (step S73), the process proceeds to FIG. 7 similarly to the fourth embodiment of the present invention, and the elevating lever 20 is moved from the second ascending position U2 to the second ascending position. Upon returning to the neutral position N2, the process proceeds to FIG. 7 similarly to the [fourth embodiment of the present invention].

Next, when the raising / lowering lever 20 is operated and held at the second lowering position D2 in a state where the seedling planting device 6 is raised (step S73), similarly to the [fourth embodiment of the present invention]. When the operation proceeds to FIG. 7 and the elevating lever 20 is returned from the second lowering position D2 to the second neutral position N2, the operation proceeds to FIG. 7 as in the [fourth embodiment of the present invention].

In this case, the positional relationship between the first and second neutral positions N1 and N2 shown in FIG. 13 is exchanged, and the first neutral position N1 at the front position and the second neutral position N2 at the rear position are arranged. 1 From the neutral position N1, an upward first rising position U1,
From the first neutral position N1 to the first downward position D1, the second
The second rising position U2 may be arranged upward from the neutral position N2, and the second descending position D2 may be arranged downward from the second neutral position N2.

[Ninth Embodiment of the Invention] In the above [Embodiment of the Invention], [First Embodiment of the Invention] to [Eighth Embodiment of the Invention], the motor is controlled by the lifting lever 20. 17 is operated to operate the planting clutch 16 on the transmission side and the transmission cutoff side, but by operating an operation switch (not shown) provided separately from the lifting lever 20, The motor 17 may be operated to operate the planting clutch 16 on the transmission side and the transmission cutoff side.

In step S6 of FIG. 3, the raising / lowering lever 20 is moved to the lower position D during the raising of the seedling planting device 6 in the first state.
Is operated without moving to step S8.
9, the seedling planting apparatus 6 may be configured to descend without stopping. In step S10 of FIG. 3, when the raising / lowering lever 20 is operated to the ascending position U during the lowering of the seedling planting device 6 in the first state, the process shifts to step S4 without shifting to step S8, and seedling is seeded. The device 6 may be configured to rise without stopping. The present invention can be applied not only to a riding type rice transplanter having the seedling planting device 6 but also to a riding type direct sowing device having a direct sowing device, an agricultural tractor having a rotary tilling device, and the like.

[0090]

According to the first aspect of the present invention, in the working device lifting / lowering structure of the working vehicle, the first state in which the working device is quickly operated on the ascending side and the descending side, and the working device is raised and lowered to an arbitrary height. By setting the second state to be stopped by the switching means in advance by using the switching means and enabling the lifting and lowering of the working device by one manual operation tool, as in the configuration described in “Prior Art”, As a result, it is possible to avoid a situation in which the operator is lost as to which of the lifting operation switch and the lifting lever should be operated, and the operability of lifting and lowering the working device can be improved.

According to the features of the second, third and fourth aspects, the "effect of the invention" of the above-mentioned claim 1 is provided similarly to the case of the first aspect. Such an "effect of the invention" is provided. According to the features of claims 2, 3 and 4, since the manual operation tool is provided with a push operation switch as a switching means (because the switching means is operated by moving the artificial operation tool in the longitudinal direction).
(Because the switching means is operated by rotating the grip portion of the artificial operation tool), the switching means can be operated with the hand holding the artificial operation tool, further improving the operability of lifting and lowering the working device. I was able to.

According to the features of claims 5, 6, and 7, the state in which the working device is quickly operated on the ascending side and the descending side, and the state in which the working device is raised and lowered to an arbitrary height and stopped is one. Since it can be obtained by artificial operation tools,
It is possible to avoid a situation in which an operator may be confused as to which one of the lifting operation switch and the lifting lever should be operated as in the configuration described in “Prior Art”, and the lifting and lowering of the working device can be avoided. Operability was improved.

According to the feature of claim 8, the "effect of the invention" of the above-described claim 7 is provided similarly to the case of the claim 7, and in addition to the "effect of the invention", the following "invention" is provided. Of the effect. According to the eighth aspect of the present invention, when the artificial operation tool is operated beyond a predetermined position in the first direction (a predetermined position in the second direction), the operation resistance becomes heavy, so that the working device is moved to a predetermined position. Can be easily recognized by the worker as being in a state of being raised to a position where the working device is lowered to a grounding position where the working device is grounded, and a state in which the worker is misunderstood can be reduced. Was.

According to the ninth aspect of the present invention, the state in which the operation of the working device is quickly raised and lowered and the state in which the working device is raised and lowered to an arbitrary height and stopped are controlled by one artificial operation tool. Therefore, it is possible to avoid a situation in which an operator may be confused as to which one of the lifting operation switch and the lifting lever should be operated as in the configuration described in “Prior Art”. Thus, the operability of lifting and lowering the working device could be improved. According to the feature of claim 9, when a state in which the operation of the working device to the ascending side and the descending side is quickly performed, and a state in which the working device is raised and lowered to an arbitrary height and stopped, is obtained by one artificial operation tool, Since the operation direction of the artificial operation tool in the above two states is different, a situation in which the operation of the artificial operation tool is erroneously made to appear in the other state when obtaining one state And the operability of lifting and lowering the working device could be improved. In this case, an upward operation of the artificial operation device corresponds to a state in which the operation device is quickly moved upward, and a downward operation of the artificial operation device is quickly performed in a state in which the operation device is quickly operated downward. Since the operation corresponds to the operation feeling of the worker and the operation of the working device on the ascending side and the descending side, the possibility of the operator's erroneous operation is reduced.

According to the tenth feature, the state in which the working device is quickly operated on the ascending side and the descending side and the state in which the working device is raised and lowered to an arbitrary height and stopped are controlled by one artificial operating tool. Therefore, it is possible to avoid a situation in which an operator may be confused as to which one of the lifting operation switch and the lifting lever should be operated as in the configuration described in “Prior Art”. hand,
The operability of lifting and lowering the working device could be improved. According to the feature of claim 10, a state in which the operation of the working device to the ascending side and the descending side is quickly performed, and a state in which the working device is raised and lowered to an arbitrary height and stopped by one artificial operating tool, Since the positions (front and rear positions) of the artificial operation tools in obtaining both of the above-mentioned states are different, the operation of the artificial operation tools may be erroneously performed to obtain the other state in obtaining one state. It is possible to improve the operability of raising and lowering the working device by reducing the number of such situations. In this case, the upward operation of the artificial operating tool corresponds to a state in which the operation of the working device is quickly performed on the ascending side and a state in which the operating device is raised to an arbitrary height and stopped, and the operation device is moved to the descending side of the working device. In the state in which the operation is performed quickly and the state in which the working device is lowered to an arbitrary height and stopped, the downward operation of the artificial operating tool corresponds to the operator's operation feeling and the rising side and the descending side of the working device. , The risk of causing an erroneous operation by the operator is reduced.

According to the features of claim 11, claims 1 to 1
Claims 1 to 10 as in any one of 0
The present invention has the following “effects of the invention” in addition to the “effects of the invention”. According to the feature of claim 11, an artificial operation tool is provided in the vicinity of the steering handle for performing the steering operation of the aircraft, and when the operator manually operates the artificial operation tool while holding the operation handle, By slightly moving the hand holding the steering handle, the artificial operation tool can be operated, so that the operability of lifting and lowering the working device can be further improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a diagram showing a linked state of a lifting lever, a control valve, a motor of a planting clutch, and the like.

FIG. 3 is a diagram showing a control flow in a first state.

FIG. 4 is a diagram showing a control flow in a second state.

FIG. 5 is a plan view showing the vicinity of an elevating lever according to the first alternative embodiment of the present invention;

FIG. 6 is a diagram showing a first half flow of control according to a fourth alternative embodiment of the present invention;

FIG. 7 is a diagram showing a second half flow of control according to a fourth alternative embodiment of the present invention;

FIG. 8 is a diagram showing a control flow according to a fifth alternative embodiment of the present invention;

FIG. 9 is a side view of the vicinity of a lifting lever according to a sixth modification of the present invention.

FIG. 10 is a diagram showing a control flow according to a sixth different embodiment of the present invention.

FIG. 11 is a side view showing the vicinity of a lifting lever according to a seventh modification of the present invention.

FIG. 12 is a diagram showing a control flow according to a seventh alternative embodiment of the present invention;

FIG. 13 is a side view showing the vicinity of a lifting lever according to an eighth embodiment of the present invention;

FIG. 14 is a diagram showing a control flow according to an eighth embodiment of the present invention;

[Explanation of symbols]

 Reference Signs List 6 Working device 7 Elevating mechanism 18 Control handle 20 Artificial operation tool 20a Grip portion of artificial operation tool 21 Switching means, push operation switch N Neutral position

Claims (11)

[Claims] 1. A lifting mechanism for lifting and lowering a working device provided on a machine body, and an artificial operation that can be artificially operated in a first direction from a neutral position and in a second direction opposite to the first direction from the neutral position. When the artificial operation tool is operated in a first direction, the lifting device is operated so that the working device is raised to a predetermined position, and the artificial operation tool is operated in a second direction. First control means for operating the elevating mechanism so that the working device descends to a ground contact position where the working device is touched, and operating the elevating mechanism to the ascending side when the artificial operating tool is operated and held in a first direction. A second control means for operating the elevating mechanism downward when the artificial operation tool is operated and held in the second direction, and stopping the elevating mechanism when the artificial operation tool is operated to the neutral position. The first system A working device lifting / lowering structure for a working vehicle, comprising a switching means which can be set artificially in a first state for operating the control means and a second state for operating the second control means. 2. The work equipment lifting / lowering structure for a work vehicle according to claim 1, wherein said switching means is constituted by a push operation switch provided at a tip portion of said artificial operation tool. 3. An artificial operation tool is configured to be movable along a longitudinal direction of the artificial operation tool that intersects the first and second directions, and the artificial operation tool is operated to move along the longitudinal direction. The working device lifting / lowering structure for a working vehicle according to claim 1, wherein the switching means is configured to be operated. 4. The switching means, wherein a grip portion of the artificial operation device is rotatable around an axis along a longitudinal direction of the artificial operation device, and the grip portion of the artificial operation device is rotated to operate the switching means. The working device lifting / lowering structure for a work vehicle according to claim 1, wherein the work device is configured to be operated. 5. An elevating mechanism for elevating and lowering a working device provided on an airframe, and an artificial operation which can be artificially operated in a first direction from a neutral position and in a second direction opposite to the first direction from the neutral position. And when the artificial operation tool is continuously operated twice in the first direction, the lifting / lowering mechanism is operated so that the working device is raised to a predetermined position set in advance, and the artificial operation tool is moved to the second position. Operating the elevating mechanism so that when the operation device is operated twice in two directions continuously, the working device is lowered to a contact position where the work device contacts the ground;
Control means, when the artificial operation tool is operated and held in the first direction, the elevating mechanism is operated to the ascending side, and when the artificial operation tool is operated and held in the second direction, the elevating mechanism is operated. A working device lifting / lowering structure for a working vehicle, comprising: a second control means for operating the descending side and stopping the lifting / lowering mechanism when the artificial operation tool is operated to a neutral position. 6. An elevating mechanism for elevating and lowering a working device provided on the body, and an artificial operation that can be artificially operated in a first direction from a neutral position and in a second direction opposite to the first direction from the neutral position. And operating the artificial operating tool in the first direction and immediately operating the neutral position to the neutral position activates the lifting / lowering mechanism so that the working device rises to a predetermined position set in advance, and operates the artificial operating tool. A first control means for operating the elevating mechanism so that the working device is lowered to a ground contact position where the work device is grounded when the neutral position is immediately operated in the second direction; and the artificial operation tool is operated and held in the first direction. When the raising and lowering mechanism is operated on the ascending side, and when the artificial operating device is operated and held in the second direction, the elevating mechanism is operated on the lower side and the artificial operating device is operated to the neutral position. The lifting mechanism Work vehicle of the working device lifting structure that is a second control means for locked. 7. An elevating mechanism for elevating and lowering a working device provided on an airframe, and an artificial operation that is artificially operable in a first direction from a neutral position and in a second direction opposite to the first direction from the neutral position. And when the artificial operation tool is operated until it exceeds a predetermined position in the first direction, the lifting / lowering mechanism is operated so that the working device rises to a predetermined position set in advance, and the artificial operation tool is moved to the second position. First control means for operating the elevating mechanism so that when the operation device is moved beyond a predetermined position in two directions, the operation device is lowered to a ground contact position where the work device touches the ground; and the artificial operation tool is operated and held at a predetermined position in the first direction. When the operation is performed, the elevating mechanism is operated to the ascending side, and when the artificial operating device is operated and held at a predetermined position in the second direction, the elevating mechanism is operated to the descending side to neutralize the artificial operating device. Operate to position Working apparatus lifting structure of the working vehicle that is a second control means for stopping the lifting mechanism. 8. The first artificial operation tool is moved to the first position by an operation resistance when the artificial operation tool is operated to a predetermined position in the first direction.
The operation resistance when operating beyond the predetermined position in the direction is set to a heavy one, and the artificial operation tool in the second direction is more than the operation resistance when operating the artificial operation tool to the predetermined position in the second direction. 8. The working device lifting / lowering structure for a working vehicle according to claim 7, wherein the operation resistance when operating beyond a predetermined position is set to be heavy. 9. A lift mechanism for lifting and lowering a working device provided on the machine body, and an artificial operation tool which can be manually operated upward and downward from a neutral position and forward and backward from a neutral position, When the artificial operation tool is operated in the upward direction, the lifting / lowering mechanism is operated so that the working device is elevated to a predetermined position set in advance. When the artificial operation tool is operated in the downward direction, the work device is grounded. First control means for operating the elevating mechanism so as to descend to the first position, and when the artificial operation tool is operated and held in one of the front and rear directions, the elevating mechanism is operated to the ascending side, and A second control means for operating the elevating mechanism downward when the operating tool is operated and held in the other of the front and rear directions, and stopping the elevating mechanism when operating the artificial operating tool to a neutral position; With Working device lifting structure of a work vehicle. 10. An elevating mechanism for elevating and lowering a working device provided on the body, and operable to a front position and a rear position, which are artificially moved upward and downward from the front position and upward and downward from the rear position. When the artificial operation tool is operated to the upper side in a state where the artificial operation tool is operated to one of the front side and the rear side position, the work device is set in advance to a predetermined position. A first control means for operating the elevating mechanism so as to ascend to a position, and operating the elevating mechanism such that when the artificial operation tool is operated in a downward direction, the working device is lowered to a ground contact position where the work device is in contact with the ground; In a state where the operating tool is operated to the other of the front side or the rear side position, when the artificial operating tool is operated and held upward, the elevating mechanism is actuated upward, and the artificial operating tool is moved downward. Operate and hold And the elevating mechanism is operated to the descending side and have a second stopping and operating the manual control device on the other of the front or rear position the elevating mechanism
A working device lifting / lowering structure for a working vehicle, comprising: a control unit. 11. The work equipment lifting / lowering structure for a work vehicle according to claim 1, wherein the artificial operation tool is provided near a steering handle for performing a steering operation of the body.