JP3236552B2 - Passenger work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction in which a working device is connected to a traveling vehicle body so as to be able to drive up and down freely, power is supplied to the working device from the traveling vehicle body, and a pair of left and right drawing markers are provided. The present invention relates to a riding work machine that is provided so as to be freely switchable between a working posture in which the drawing marker protrudes outward in the left-right direction and a non-working posture pulled upward.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned riding work machine, a control section on a traveling vehicle body is provided with a switch-operated lifting / lowering operation tool, and an operation for lowering a working device to a grounding work position based on operation of the lifting / lowering operation tool. And an operation for raising the work clutch up to the maximum ascending position can be made to appear alternately, and the on / off operation of the work clutch has been configured to be performed by another different operating tool. And a pair of left and right
Mechanically linked with lifting and lowering of the work equipment as a drawing marker
The working device is in a non-working position
And the marker on the outside of the turn falls down
It is configured so that it can be switched to a prone action position
There is.

[0003]

In the above-mentioned conventional structure, for example, in a working machine such as a riding cultivator, which does not cause any particular inconvenience even when the working device is raised while the working device is being driven during work traveling. Although there is no problem, for example, in the case of transplanting seedlings such as rice transplanters, if you raise it while driving the working device, problems such as sowing seedlings in the air will occur, The work clutch must always be in the disengaged state when the working device is raised. However, if a dedicated work clutch on / off operation tool is provided separately from the lifting / lowering operation tool of the working device as in the conventional structure described above, in the ridge turn operation in the field, the operation speed deceleration operation of the body, Several complex operations such as steering operation, lifting operation of the working device, and disengagement of the work clutch must be performed within a short time.
In addition, since these operations are performed by changing the operation tool, there is a possibility that an erroneous operation or an operation delay may be caused. In addition, the operation of the drawing marker is performed by raising and lowering the working device.
It is mechanically linked with and stands up with the rise of the work equipment,
The marker on the outside of the turn falls down with the turning operation of the running vehicle
If you are configured to switch to
Do not raise the working equipment to supply seedlings or plant
When making both markers inactive at the time of
It may be difficult to select an appropriate marker
The degree of freedom was low. SUMMARY OF THE INVENTION An object of the present invention is to easily raise and lower a working device, turn on and off a work clutch, and select a highly flexible operation state of a drawing marker at the time of turning on a ridge, quickly, and easily with few erroneous operations. The point is to be able to do it.

[0004]

In order to achieve the above object, the technical means of the present invention is to connect a working device to a traveling vehicle body so as to be able to drive up and down, and to enter a driving state of the working device. A work clutch that can be switched to a disengaged state to stop the working device is provided, and is configured to be freely switchable between a working posture protruding outward in the left-right direction and a non-working posture pulled up upward. Equipped with a pair of left and right drawing markers , elevating and lowering the working device, and a working clutch
Of turning on and off, and the working state of the left and right drawing markers
Move the operating tool to be selected near the steering wheel of the control unit.
When the operating tool is urged to return to the neutral position,
In both cases, the turning operation surface of the steering handle is
Switching operation in the near and far directions.
Operation of the working device to a predetermined height
It is configured so that the descending operation from the height is performed, and further,
The on / off operation of the work clutch, and the distance
Left and right lines are drawn by operation in a direction different from the operation direction.
The point that the action state of the marker is configured to be selected.
is there.

[0005]

The operation of the above technical means is as follows. That is, the lifting / lowering operation of the working device and the on / off operation of the work clutch, which are performed during a turning operation in a field such as a headland turning around a ridge, are performed by operating devices operated in a common specific direction. Since the operations can be performed as a series of operations, as compared with a case where each of the operations is performed by a different operation tool, the trouble of switching the operation tools is eliminated and the operation is simplified.
Then , the operation of the operating tool is performed by raising the target position of the working device.
And that the descent start position is at a predetermined height
And the switching operation of the operating tool
Position near the handle that is easy to operate at hand
Turning with the steering wheel in synergy with
Can it to operate quickly in a short time during the work
is there. In other words, wait until the work equipment moves up and down to the desired height.
It is necessary to perform an operation to return the operating tool to neutral
In addition, turning operation is performed by switching operation that is
The work equipment can be moved up and down quickly during operation.
Including the on / off operation of the work clutch,
And selecting the left and right markers in a short time
It is. In addition, the operating direction of the operating
The lifting and lowering of the working equipment is performed by turning the steering wheel.
This operation is performed in the perspective direction on the dynamic operation surface.
Affects the turning operation of the steering wheel
It is easy to do without. In other words, the direction in which the above operation is performed is an example.
For example, along the direction of rotation of the steering wheel.
If you do that operation, the steering wheel will be the same
In the same direction, causing the aircraft to meander.
However, in the present invention, the steering wheel rotation
It is possible to operate in a direction different from the
Problems are prevented beforehand. In addition, since the selection of the operation state of the drawing marker can be performed by an operation in a direction different from the lifting / lowering operation of the working device or the on / off operation of the work clutch, the selection operation having a high degree of freedom of the operation state of the drawing marker or the above-described operation can be performed. It is less likely that the lifting operation of the device and the on / off operation of the work clutch will be confused.

[0006]

Therefore, according to the characteristic structure of the first aspect of the present invention, when turning the headland at the ridge, for example, the position adjustment is performed in a state where the ground working device is lowered, such as a seedling planting operation. Even when the work clutch is engaged and the work start position is set, the operation can be performed without changing the operation tool, thereby eliminating the trouble of switching the operation tool and improving the controllability. It became. So
The operation of the operating tool in the specific direction
A predetermined height at which the ascent target position and descent start position are set in advance
That the operating tool is neutrally biased and the switch
Operation that can be performed with
Steering wheel operation in synergy with being close to the dollar
Quick operation in a short time when turning work with
It is possible to further improve the steering operability. I
Of the operating directions of the above operating tools,
Operate the steering wheel far from the turning operation surface.
Since this is a near operation, this operation
Easy to do without affecting the pivoting operation of the handle
This operation causes the aircraft to meander, etc.
There is no risk of obstruction. In addition, since the selection of the drawing marker to be switched to the operation posture can be performed by an operation in a direction different from the operation of lifting and lowering the working device and the operation of engaging the work clutch, the selection operation with a high degree of freedom of the drawing marker can also be performed by the above-described working device. The lifting / lowering operation and the on / off operation of the work clutch can be performed efficiently without confusion.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 15 shows a riding type rice transplanter which is an example of a riding work machine. In this rice transplanter, a seedling planting device 3 [an example of a ground working device] is driven by a lift cylinder 4 [an example of a driving mechanism] at a rear portion of a riding type traveling vehicle body 1 via a parallel quadruple link mechanism 2 so as to be able to move up and down and to be electrically driven. The rolling motor 5 is connected so as to be capable of driving rolling freely around the longitudinal axis.

In the traveling vehicle body 1, the power of an engine 6 mounted on the front of the body is transmitted to front and rear wheels 10, 11 via a belt type continuously variable transmission 7 and a gear shift type main transmission 9 in a transmission case 8. The planting device 3 is constructed so as to drive and drive the machine body, and the power after shifting can be freely intermittently operated via the planting clutch 12 [an example of a work clutch].
The transmission system is configured to be transmitted to The continuously variable transmission 7 is a split pulley type continuously variable transmission, and is driven by an electric cylinder 15 so that the interval between the split pulleys is set to a speed set by a potentiometer type speed setting device 14 provided on the body operation panel 13. It is configured to operate.
The main transmission 9 is configured to be freely switchable between a first forward speed F1 for planting work, a second forward speed F2 for road running, a neutral position N, and a reverse position R by a main shift lever 16. is there.

The seedling planting device 3 takes out seedlings one by one from the lower end of the seedling rest 18 and the lower end of the seedling rest 18 which reciprocate in a reciprocating lateral movement with a constant stroke with respect to the planting transmission case 17 also serving as a frame. A planting mechanism 19 for planting, a plurality of ground floats 20 and the like which are supported so as to be able to swing up and down around a rear fulcrum are provided, and a drawing for drawing a running index line in the next work process on a field scene is provided on both left and right sides. The marker 21 is provided so as to be able to move back and forth.

Each of the drawing markers 21 and 21 is configured to be biased by switching to the protruding posture and to be forcibly stored via a wire as the seedling planting device 3 is raised.
The respective lock mechanisms 22, 22 that lock and hold the left and right drawing markers 21, 21 in the stored state are selectively unlocked, and when the seedling planting device 3 is lowered, the drawing marker on the side selected when the seedling planting device 3 is lowered. It is configured to be set to the protruding action posture. The release operation of each of the lock mechanisms 22, 22 is performed as follows.
As shown in FIG. 7, the first operation tool 24 provided on the lower right side of the steering handle 23 is selectively operated by switching from a neutral position in which a return bias is applied in forward and backward and forward and reverse directions. It is. The first operating tool 24 is linked so that when the forward / reverse switching operation is performed from the neutral position, the on / off clutch switch 25 of the planting clutch 12 is turned on in conjunction therewith.

As shown in FIG. 1, the stud clutch 12 is operated by a forward / reverse type electric clutch motor 27 driven by a relay circuit 26 which is switched by a clutch ON signal and a clutch OFF signal. A structure for performing the on / off operation via the member 28,
To determine whether the clutch is engaged or disengaged,
Clutch-off switch 2 that contacts operating member 28
9. It is configured to detect by one of the clutch-on switches 30. The link mechanism for the interlocking operation is provided with a compression spring SP that is interlocked and linked by a compression operation when operating on the clutch disengagement side, so that the clutch disengagement operation can be quickly performed while ensuring operation flexibility. .

The seedling planting device 3 is provided with an operation lever 32 provided on the lateral side of the driver's seat 31 so as to be able to swing back and forth manually.
Is configured to be moved up and down by the switching operation. As shown in FIG. 6, the operation lever 32 has a “planting position” P (an example of a working position), a “down position” D, a “neutral position” N, a “up position” U, and an “automatic position” AT. Each of them is configured to be switchable, and the switching operation is
A control device 3 having a microcomputer by detecting the amount of forward / backward swing by a potentiometer type lever sensor 33
4 [an example of the control means] is performed by determining the level of the detection value of the lever sensor 33. That is, the control device 34
Is based on that level,
The planting clutch 12 is operated to engage the clutch while the seedling planting device 3 is in contact with the ground and lowered. If the planting clutch 12 is in the “down position” D, the seedling planting device 3 is lowered while contacting the planting clutch.
If the “neutral position” N, the position is held as it is, and if the “elevated position” U, the seedling planting device 3 is forcibly raised to the set height. Then, when the operation is switched to the "automatic position" AT, as described later, the elevating operation by the elevating operation switch 35 can be performed, and the control for forcibly raising the seedling planting device 3 when the body moves backward is performed.

As shown in FIG. 7, a second operating tool 36 is provided on the lower left side of the steering handle 23 in the body operating section, and the second operating tool 36 swings upward from the neutral position in which the return operation is performed. When the moving operation is performed, the elevating operation switch 35
And the state where the seedling planting apparatus 3 is lowered to the ground and the state where the seedling planting apparatus 3 is raised to the maximum ascending position can alternately appear at each entering operation. still,
When the second operation tool 36 is pivoted downward from the neutral position, the clutch switch 25 for switching the planting clutch 12 to the engaged state is operated.

The second operating tool 36 constructed as described above
And the above-mentioned first operating tool 24 is moved in a specific operating direction, that is , the turning operation surface of the steering handle 23.
Switching operation in the near and far directions
Operation of raising the seedling planting device 3 to a predetermined height
Lowering operation from the predetermined height and engaging the planting clutch 12
Operation in the near-far direction
The operation of the left and right drawing markers 21 by the operation in the direction different from the direction
The operating tool from which the use state is selected is configured.

A reverse detection switch 37 for detecting that the main shift lever 16 has been detected at the reverse position R is provided. When the reverse detection switch 37 is in a detection operation state, the control device 34 causes the seedling planting device 3 to operate. Is forcibly raised to the maximum raising position. The detection that the seedling planting device 3 has been raised to the maximum raised position is configured to be detected by an intermediate portion of the link mechanism 2 acting on a link switch 38 provided on the rear side of the driver's seat 31. is there. The raising and lowering control of the seedling planting apparatus 3 by the raising and lowering operation switch 35 and the forcible raising control at the time of the aircraft reversing are performed only when the operation lever 32 is operated to the "automatic position" AT. I have.

The operating lever 32 is operated to one of the "planting position" P, the "down position" D, and the "automatic position" AT, and the main transmission lever 16 is moved to the first forward position. In a state where the speed is operated at the speed F1 or the forward second speed F2, the automatic rolling control is executed so that the left and right inclination posture of the seedling planting device 3 is maintained at the set posture. More specifically, as shown in FIG. 3, the main transmission switch 39 for detecting whether the main transmission lever 16 is operated to the first forward speed F1 or the second forward speed F2, and the absolute position of the seedling planting device 3 A weight type inclination sensor 40 for detecting an inclination angle from a horizontal posture, and a potentiometer type inclination angle setting device 41 for artificially setting a target inclination posture, and a control device based on these outputs and the output of a lever sensor 33 are provided. 3
4 performs control as shown in the control flowchart of FIG. The main shift switch 39 detects that the main shift lever 16 is operated to the first forward speed F1 or the second forward speed F2, and the output of the lever sensor 33 changes the operating position of the operating lever 32 to the “planting position”. P, when it is detected that any of the “down position” D and the “automatic position” AT has been operated, the detection value XR of the inclination sensor 40 differs from the target value Ra by the inclination angle setting device 41, The detected value XR of the inclination sensor 40 is the target value Ra by the inclination angle setting device 41.
If it is smaller, the output for the lower right is output to the relay circuit 42 until these values substantially match, and the rolling motor 5 is rotated in the lower right direction. Tilt sensor 4
If the detected value XR of 0 is larger than the target value Ra by the inclination angle setting device 41, an output for lowering to the left is output to the relay circuit 42, and the rolling motor 5 is rotationally driven to lower left. The circuit configuration is such that when the rolling motor 5 is driven to the mechanical operation limit and detected by the left and right limit switches 43 and 44, the relay circuit 42 is directly turned off to stop the driving of the rolling motor 5. I have. Further, even when an abnormality occurs in the automatic control system as described above, the relay circuit 42 is directly driven by the manual rolling switch 45 which is three-position switching type and is biased to return to the center, thereby manually performing the rolling drive. It is configured to be able to. In the manual rolling operation by the manual switch 45, the control signal from the controller 34 is configured to be kept in the off state.

During the planting operation, automatic raising and lowering control is performed so that the ground height of the seedling planting device 3 is maintained at a set value. As shown in FIG. 2, a potentiometer type float sensor 46 for detecting the vertical swing amount based on the ground pressure fluctuation of the ground float 20 located at the left and right center is provided.
The detection value of the float sensor 46 is transmitted to the control panel 13
The controller 34 automatically controls the electromagnetic control valve 48 for the lift cylinder 4 so as to fall within the setting range of the potentiometer type sensitivity setting device 47 provided in the above, so that the ground height of the seedling planting device 3 is set. Value will be maintained. That is, as shown in FIG. 5, the control device 34 holds the state if the detection value XS of the float sensor 46 is within the dead zone of the target value Sa, and if the detection value XS is larger than the target value Sa, the electromagnetic control is performed. A drive signal is output to the ascending electromagnetic solenoid UPSol of the valve 48, and if the detected value XS is smaller than the target value Sa, the descending electromagnetic solenoid DWS
ol to output a drive signal. The automatic lifting control is configured to be executed only when the operation lever 32 is operated to any one of the “planting position” P, the “down position” D, and the “automatic position” AT. I have.

The sensitivity setting device 47 is connected to the ground float 20.
Is changed, and the sensing load of the ground float 20 is changed according to the hardness of the mud. The control target value by the sensitivity setting device 47 can be corrected by a three-position switching type correction switch 51. As shown in FIG. 8, by changing the correction switch 51, the change characteristic of the control target value with respect to the set value by the sensitivity setting unit 47 is changed by the parallel movement to the insensitive side (the reference attitude of the ground float is in the forward rising direction) or the sensitive side (the front side). Downward direction]. Further, if the vehicle traveling speed becomes high, the contact float 20 may be slightly lifted, and the seedling planting device 3 may rise to become shallow. Therefore, the change characteristic of the control target value in the elevating control is the vehicle speed. It is configured to be changed according to. That is, the rotation speed sensor 52 for detecting the rotation speed of the engine 6 and the continuously variable transmission 7
Is provided with a potentiometer-type shift position sensor 53, and the control device 34 calculates the vehicle speed from these outputs, and if the vehicle speed is high [for example, the vehicle speed is 0.8 m /
[Seconds or more] The change characteristic of the control target value is changed to the insensitive side, and the change amount increases as the vehicle speed increases. Furthermore,
Since the hydraulic pump (not shown) for the lift cylinder 4 is driven by the engine 6, the hydraulic oil flow rate for the lift cylinder 4 changes due to the change in the engine speed. In accordance with the detection result, the duty ratio of the pulse current supplied to each of the electromagnetic solenoids UPSol and DWSol of the electromagnetic control valve 48 is appropriately changed to control the hydraulic oil flow to be constantly maintained at a constant level.

As shown in FIG. 9, the tilt angle setting device 4
1. Manual rolling switch 45 and correction switch 51
Are disposed on a rear wheel fender 54 located on the side of the driver's seat 31, and these are openable and closable lids 55.
It is configured to cover with.

Next, the control operation of the control device 34 relating to the elevating operation of the seedling planting device 3 will be described in detail with reference to the control flowcharts shown in FIGS. When the main switch is turned on and the control is started, the ascending electromagnetic solenoid UPSo of the electromagnetic control valve 48 for the lift cylinder 4 is moved.
1 and the outputs of the lowering electromagnetic solenoid DWSol are turned off, and the operation flag f0 for the lifting / lowering operation switch 35, the operation flag f1 for the clutch switch,
Initialize each of the operation flag f2 for automatic lifting control and the operation flag f3 for reverse lifting operation to “0” [Step 1,
2]. When the operation lever 32 is operated to a position other than the "automatic position" AT, the operation flags f0 to f3 are initialized, and when the operation lever 32 is at the "neutral position" N, the clutch engagement signal STR for the clutch motor 27 is turned off. If the clutch off switch 29 is on, the clutch off signal ST
P is turned off, and if the clutch off switch 29 is off, a clutch disengagement signal STP is output and the planting clutch 1
2 is maintained in the cut state [Steps 3-9]. And
If the operation lever 32 is at a position other than the "automatic position" AT or the "neutral position" N when the main switch is turned on, once the operation lever 32 is switched to the "neutral position" N, the next operation is performed. Proceed to step [Step 1
0].

When the operating lever 32 is operated to the "up position" U, the clutch engagement signal STR is turned off, the operation flag f2 for automatic up / down control is set to "0", and then the clutch off switch 29 is turned on. If there is, the clutch disengagement signal STP is turned off, and if the link switch 38 is on (the seedling planting device 3 is in the up state), the ascending electromagnetic solenoid UPSol is turned off. If the link switch 38 is in the off state, it goes up. The operator turns on the electromagnetic solenoid UPSol for raising the seedling planting device 3 [steps 11 to 1].
7]. If the clutch-off switch 29 is not on, the clutch disengagement signal STP is turned on and the planting clutch 12 is disengaged by the clutch motor 27, and the ascending and descending solenoids UPSol and DWSol are turned off [steps 18, 19]. When the operation lever 32 is operated to the "down position" D, the output of the clutch engagement signal STR is stopped, and then the planting clutch 12 is turned on in the same manner as the control described above.
The seedling planting apparatus 3 is lowered [Steps 24 to 26] while maintaining the cutting state [Steps 20 to 23]. When it is determined from the detection value of the float sensor 46 that the seedling planting device 3 has touched the ground, the automatic elevation control mode is executed [step 27]. At this time, if the link switch 38 is turned on, the ascending solenoid UPSol is turned off, and the automatic up / down control operation flag f2 is set to "1" (steps 28 to 30). When the operation lever 32 is in the “ planting position ”
When operated in the location "P, after the clutch engaging signal STR to the OFF state, the clutch motor 2 clutch-on switch 30 is outputting the clutch engaging signal STR to turn on
7, the planting clutch 12 is engaged (steps 31 to 34). Thereafter, automatic elevating control is performed. The operation flags f0, f1 and f3 other than the operation flag f2 for automatic elevation control are maintained at "0" (step 35).

Next, the operation when the operation lever 32 is operated to the "automatic position" AT will be described. Operation lever 3
When the up / down operation switch 35 is operated after the 2 is operated to the "automatic position" AT, the switch operation flag f0 is set to "1", and when the link switch 38 is in the ON state (up state), the automatic up / down operation is performed. Set the control operation flag f2 to “0”
, And the lowering solenoid DWSol is turned on to lower the seedling planting device 3 [Steps 36, 37, 39 to
43]. When the seedling planting apparatus 3 comes down on the ground, the switch operation flag f0 is set to "0", the operation flag f2 for automatic elevating control is set to "1", and then the mode shifts to the automatic elevating control mode [Steps 44 to 44]. 48]. If the link switch 38 is off when the lifting operation switch is operated, the planting clutch 12 is disengaged to raise the link switch 38 until the link switch 38 is turned on (steps 49 to 5).
4]. When the link switch 38 is turned on, the switch operation flag f0 is set to "0" [Steps 55 and 5].
6]. When the up / down operation switch 35 is operated again during the up / down operation, the operation direction is reversed [steps 56 to 60]. Note that, when the raising / lowering operation switch 35 is operated in the initial state, the planting clutch 12
If is not the cutting state, it returns to the initial state [Step 3
7, 38]. Then, when the clutch switch 25 is turned on by the operating tools 24 and 36 of the control unit after the seedling planting device 3 is lowered, the clutch switch operation flag f1 is set to "1" and planting is performed. When the clutch 12 is engaged (steps 61 to 64), the alarm buzzer 56 sounds until the clutch-on switch 30 is turned on. When the clutch-on switch 30 is turned on, the clutch switch operation flag f1 is set to "0" to issue an alarm. It stops (steps 65 to 69). Thereafter, the mode shifts to the automatic elevating control mode.

After the operation lever 32 is operated to the "automatic" position, the operation of the main transmission lever 16 to the reverse transmission position is detected by the reverse detection switch 37, and if the link switch 38 is not in the ON state, After setting the reverse ascending operation flag f3 to "1" [Steps 70 to 7]
4] Then, the process proceeds to a step 49, wherein the seedling planting apparatus 3 is operated until the planting clutch 12 is turned off and the link switch 38 is turned on.
Is forced to rise. When the link switch 38 is turned on, the reverse ascending operation flag f3 is set to "0" (step 56). Further, there is no operation of the lifting / lowering operation switch 35 or the detection operation of the reverse detection switch 37, and the reverse lifting operation flag f3
Is “1”, when the seedling planting device 3 is in the ascending position and the operation lever 32 is shifted from another position, or when the automatic elevating control mode is not set, the seedling planting device 3 is held at the ascending / descending position [ Steps 75 to 79]; otherwise, the mode shifts to the automatic elevating control mode [steps 80 and 46].

[Other Embodiments] (1) Based on the downward operation of the second operation tool 36, the on-off state and on-off state of the planting clutch 12 for each operation in the same manner as the operation of the elevating operation switch 35. May be controlled so as to appear alternately. That is, the second
The operating tool 36 disengages the planting clutch 12 with respect to the seedling planting device 3 and forcibly raises the seedling planting device 3 to the predetermined position based on the operation in the predetermined direction from the restored biased neutral position. The first state and the second state of lowering the seedling planting device 3 to the ground alternately appear, and based on an operation in a direction different from the predetermined direction from the neutral position,
The control device 34 is configured to perform a control operation so that a state where the planting clutch 12 is operated to be turned on and a state where the planting clutch 12 is operated to be turned off alternately appear. (2) Further, the second operating tool 36 is provided to be able to freely move back and forth around the axis of the vertical axis, and performs the switching operation of the lifting / lowering operation switch 35 based on the swinging operation to the rear side, and based on the operation to the front side. The planting clutch 12 may be operated by operating the planting clutch 12.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a control block diagram for a lifting operation.

FIG. 2 is an elevation control block diagram.

FIG. 3 is a block diagram of a rolling control.

FIG. 4 is a flowchart of a rolling control.

FIG. 5 is a lifting control flowchart.

FIG. 6 is an operation explanatory view of an operation lever.

FIG. 7 is a plan view of an arrangement portion of the operation tool.

FIG. 8 is a diagram showing the sensitivity characteristics

FIG. 9 is a plan view of an operation unit.

FIG. 10 is an elevating control flowchart.

FIG. 11 is an elevating control flowchart.

FIG. 12 is an elevating control flowchart.

FIG. 13 is a lifting control flowchart.

FIG. 14 is an elevating control flowchart.

FIG. 15 is an overall side view of the rice transplanter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running vehicle body 3 Working device 12 Working clutch 21 Drawing marker 24, 36 Operating tool

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A01C 11/02 A01B 63/10 A01B 69/02

Claims (1)

(57) [Claims] A working device is connected to a traveling vehicle body so as to be able to drive up and down. The working device is provided with a work clutch that can be switched between an engaged state for driving the working device and a disengaged state for stopping the working device. A pair of left and right drawing markers that are configured to be switchable between a working posture that protrudes outward at the time and a non-working posture that is pulled upward from the working posture , lifting and lowering of the working device, and on / off of a working clutch, What
Operation to select the operation status of the left and right drawing markers
A tool is disposed near the steering handle of the control unit, and the operating tool is biased to return to the neutral position.
In the perspective direction with respect to the turning operation surface of the steering handle
Switching operation to reach a preset height
Lifting operation of the working device, and lowering from the predetermined height
The descending operation is configured to be performed, and further, the on / off operation of the work clutch, and
Left and right by operating in a direction different from the operating direction in the perspective direction
Is configured so that the action state of the drawing marker is selected.
A riding work machine.