JP2002084835A - Paddy field implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out an arbitrary lifting and lowering operation and a forced lifting and lowering operation of an operation apparatus while simplifying an operation structure, reducing a manufacturing cost and improving operability. SOLUTION: In a paddy field implement in which the operation apparatus 4 is connected to a traveling main body 1 in a drivable and liftable manner and which is loaded with a controller 36 for controlling the lifting and lowering of the operation apparatus 4, when an operation lever 31 of a position retention type is changed to a lifting position, the controller 36 lifts the operation apparatus 4, when is changed to a lowering position lowers the operation apparatus 4, when changed to a neutral position, stops the lifting and lowering of the operation apparatus 4, when the arrival of the operation apparatus 4 is detected by a first detection means 38 for detecting the arrival of the operation apparatus 4 to a fixed upper limit position or a second detection means 39 for detecting the arrival of the operation apparatus 4 to a fixed operation height position, actuators 43 and 44 are operated to change the operation lever 31 to a neutral position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field working machine having a working device connected to a traveling machine so as to be able to drive up and down and a control device for controlling the lifting and lowering of the working device.

[0002]

2. Description of the Related Art Conventionally, in a paddy working machine as described above, for example, as disclosed in Japanese Patent Application Laid-Open No. 11-187716, a boarding operation section is provided with a position holding type operation lever and a neutral return type operation lever. A lever is provided, and when the operation lever of the position holding type is operated, an arbitrary lifting operation of raising or lowering the working device to a desired height position by a control operation of the control device based on the operation can be performed,
When the neutral-return operating lever is operated while the position-holding operating lever is operated to the automatic position, the operating device is controlled by the control device based on the operation to set the operating device at a predetermined upper limit position or a predetermined working height. It was configured to be able to perform a forced ascending / descending operation of automatically ascending or descending to a position.

[0003]

However, according to the above-mentioned prior art, a position-holding type operation lever for performing an arbitrary elevating operation of the working device and a neutral return type operation for performing a forced elevating operation of the operating device are disclosed. In addition to having levers, it is necessary to link each control lever to the control device via a dedicated linkage structure so that the control device can recognize the operation state of those control levers. As a result, there is room for improvement in operability, since two types of operation levers are used separately to perform arbitrary lifting operation and forcible lifting operation of the working device. .

[0004] It is an object of the present invention to make it possible to perform an arbitrary lifting operation and a forced lifting operation of a working device while simplifying an operation structure, reducing manufacturing costs, and improving operability.

[0005]

[Means for Solving the Problems] [Structure] In order to achieve the above object, according to the first aspect of the present invention, a working device is connected to a traveling body so as to be able to drive up and down.
In a paddy field working machine equipped with a control device for controlling lifting and lowering of the working device, an operation lever of a position holding type, an actuator for switching the operating lever to a neutral position, and detection of arrival of the working device at a predetermined upper limit position First detecting means for detecting that the working device has reached a predetermined working height position, and a second detecting means for detecting that the working device has reached a predetermined working height position. Is raised, and when the operation lever is switched to the lowered position, the working device is lowered. When the operation lever is switched to the neutral position, the working device is stopped up and down, and the first detection means or the second detection means is stopped. When the arrival of the working device is detected, the actuator is operated to switch the operation lever to the neutral position.

According to the first aspect of the present invention, when the operating lever is switched from the neutral position to the raised position, the working device is raised toward the predetermined upper limit position by the control operation of the control device based on the operation. When the first detecting means detects that the working device has reached the predetermined upper limit position due to the rise, the actuator is operated by the control operation of the control device based on the detection, and the operation lever is moved from the raised position. By switching to the neutral position, the working device can be automatically stopped at the predetermined upper limit position. Also, when the operating lever is switched from the raised position to the neutral position until the working device reaches the predetermined upper limit position,
With the control operation of the control device based on the operation, the working device can be lifted and stopped at a position in the middle of ascent until reaching the predetermined upper limit position.

Conversely, when the operating lever is switched from the neutral position to the lowering position, the working device can be lowered toward the predetermined working height position by the control operation of the control device based on the operation, and the work by the lowering can be performed. When the arrival of the device at the predetermined working height position is detected by the second detection means, the actuator is operated by the control operation of the control device based on the detection, and the operation lever is switched from the lowered position to the neutral position. In addition, the working device can be automatically stopped at a predetermined working height position. When the operating lever is switched from the lowered position to the neutral position until the working device reaches the predetermined working height position, the working device is controlled by the control device based on the operation to move the working device to the predetermined working height position. Can be stopped at a position on the way to the descent until reaching.

In other words, by switching the operating lever from the neutral position to the raised position, the working device can be automatically raised to the predetermined upper limit position, and conversely, the operating lever is switched from the neutral position to the lowered position. By doing so, the working device can be automatically lowered to the predetermined working height position,
Further, after switching the operation lever from the neutral position to the raised position, by switching the operation lever from the raised position to the neutral position until the working device reaches the predetermined upper limit position,
The working device can be lifted and stopped at a desired raised position, and conversely, after the operating lever is switched from the neutral position to the lowered position, the operating lever is moved until the working device reaches a predetermined working height position. Is switched from the lowered position to the neutral position, the working device can be stopped at the desired lowered position.

The operating lever is held at the raised position while the working device is raised, and the operating lever is held at the lowered position while the working device is lowered, so that the working device is at the predetermined upper limit position or the predetermined working height position. When the operating lever is reached, the operating lever is switched from the raised position or the lowered position to the neutral position, so that the operating position of the operating lever can be visually recognized to easily grasp the elevating state of the working device.

[Effect] Therefore, the boarding operation section is provided with a single operation lever, and the operation state of the operation lever is simple, although the operation state of the operation lever is simply linked so that the control device can recognize the operation state. By the operation, a state in which the working device is automatically raised or lowered to a predetermined upper limit position or a predetermined working height position and a state in which the working device is raised or lowered to a desired height position can appear,
The operation device can be forcibly moved up and down and arbitrarily moved up and down while simplifying the operation structure, reducing the manufacturing cost, and improving the operability.

An actuator which employs a position holding type operation lever and operates the operation lever to a neutral position when the operation device reaches a predetermined upper limit position or a predetermined work height position. By equipping with, it became possible to easily grasp the elevating state of the working device without looking at the working device.

[Structure] According to a second aspect of the present invention, in the first aspect of the present invention, a third state for detecting the appearance of the transmission state of the work clutch for interrupting transmission to the work apparatus. A switching operation to the lowered position is performed as the next operation of the operation lever that has been switched to the neutral position by the operation of the actuator based on the detection of the second detection device, the detection device being provided with the detection device. When,
The work clutch is switched to a transmission state, and the actuator is operated to switch the operation lever to a neutral position based on the detection of the third detection means.

According to the second aspect of the present invention, the operation lever, which has been switched from the lower position to the neutral position by the operation of the actuator based on the detection of the second detecting means, is again operated to the lower position, whereby the work is performed. The device can be switched to the active state.

The state in which the operating lever is switched to the neutral position by the operation of the actuator based on the detection of the second detecting means is a state in which the working device has already reached the predetermined working height position. Only when the working device can be switched to the operation state, the work device is switched to the operation state from the stage of descent where the working device has not reached the predetermined working height position and the work is started, and the work loss is caused. Can be prevented.

[Effect] Therefore, the boarding operation section is provided with a single operation lever, and the operation state of the operation lever is simple, although the operation state of the operation lever is simply linked so that the control device can recognize the operation state. By the operation, in addition to being able to perform the forced lifting operation and the optional lifting operation of the working device, it is also possible to switch the operation state of the working device,
Since it is not necessary to provide a dedicated operation tool for switching the operation state of the working device, the operation structure can be simplified, the manufacturing cost can be reduced, and the operability can be further improved.

Further, it is possible to improve the workability in which the occurrence of a work loss due to the operation device being switched to the operating state from the stage of being lowered to the predetermined work height position can be avoided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall side view of a riding rice transplanter which is an example of a paddy field working machine.
A seedling planting device 4, which is an example of a working device, is connected to a rear portion of the traveling machine body 1 via a link mechanism 3 that moves up and down by operation of a hydraulic cylinder 2 so as to be able to drive up and down, and a fertilizer device 5 is mounted. This makes it a mid-mount fertilizer specification.

The traveling body 1 receives power from an engine 6 mounted on the front of the traveling body 1 via a belt type transmission mechanism 7, a hydrostatic type continuously variable transmission 8, a gear type transmission 9, and the like. The front wheel 10 and the rear wheel 11 are configured as a four-wheel drive type that transmits power for traveling, and a central portion thereof includes a steering wheel 12 and a driver seat 13 operatively linked to the left and right front wheels 10. The boarding driving section 14 is formed.

In the seedling planting apparatus 4, while a plurality of terrain floats 15 preliminarily lands the seedling planting places with the traveling of the machine body, the working power from the gear type transmission 9 is transmitted to the feed case 16, With the power distributed from the feed case 16, the seedling mounting table 17 is reciprocated in a constant stroke in the left-right direction, and the plurality of rotary planting mechanisms 18 move the seedlings from the lower end of the seedling mounting table 17 by a predetermined amount. It is configured to perform a planting operation of taking out and planting in a field.

In the fertilizer applicator 5, a plurality of groovers 19 provided on each leveling float 15 form a fertilizer groove as the machine body travels, while a plurality of work powers from the gear type transmission 9 are used. The feeding mechanism 20 feeds out the fertilizer in the fertilizer hopper 21 by a predetermined amount, and by operating the electric fan 22, each feeding mechanism 20 is fed.
By feeding the fertilizer fed out through the guide hose 23 toward the corresponding groove generator 19, the fertilizer is buried in the lateral side of the planted seedling in the field.

As shown in FIG. 1 and FIG.
, Each leveling float 15 is supported by a corresponding one of a plurality of support arms 25 extending rearward and downward from a left-right float fulcrum shaft 24 so as to be able to swing up and down around a horizontal axis P1. Have been.

A pair of left and right drawing markers 26 are provided at the front of the traveling body 1 at a longitudinal axis P2 at a storage position along the lateral side of the body and a use position protruding laterally outward of the body.
It is possible to change the position around and at the use position,
The posture is switched around the longitudinal axis P3 between the working posture where the tip enters the field and forms the next travel reference line and the non-working posture where the tip is separated from the field and approaches the traveling body 1. Equipped where possible.

The left and right drawing markers 26 are attached to the seedling planting device 4.
When the operating wires 27 linked to the respective members are pulled in in conjunction with the rise to the predetermined upper limit position, the operating wires 27 are switched to the non-acting position against the bias of the spring 28, and in the non-acting position, By the action of the left and right holding mechanisms 29 linked to the corresponding operation wires 27, the seedling planting apparatus 4 is held in a non-operating position regardless of the descending operation. Further, by selectively releasing the holding in the storage position by each holding mechanism 29 by the operation of one of the left and right electromagnetic cylinders 30 corresponding to each holding mechanism 29, the posture switching to the working posture is allowed, and After the attachment device 4 is lowered to a predetermined planting position, which is a predetermined working height position, the release state is selectively displayed, so that the line marker 26 on the deselected side is biased by the spring 28. To switch to the working posture.

At the lower right of the steering wheel 12,
An operation lever 31 of a cross swing type and a position holding type is provided. The operation of the operation lever 31 is detected by a first switch 32 to an ascending position, which is an operation position above the neutral position, and the operation lever 31 is moved from the neutral position. The operation to the lower position, which is also the lower operation position, is detected by the second switch 33, and the operation to the left marker selection position, which is the operation position ahead of the neutral position, is detected by the third switch 34. The operation to the right marker selection position, which is also the rear operation position, is detected by the fourth switch 35, and each of the switches 32 to
Reference numeral 35 outputs each piece of detection information to a control device 36 such as a microprocessor mounted on the traveling body 1.

As shown in FIG. 2, the rear portion of the traveling body 1 is pressed by a link mechanism 3 to serve as a first detecting means for detecting that the seedling planting device 4 has reached a predetermined upper limit position. The upper limit switch 38 detects a vertical swing angle around the axis P1 of a predetermined leveling float (hereinafter, abbreviated as a sensor float) 15 to detect the seedling.
Is provided with a float sensor 39 as a second detecting means composed of a rotary potentiometer for detecting the arrival at a predetermined planting position. The upper limit switch 38 and the float sensor 39 send the detected information to the control device 36. Output.

The control device 36 is an example of an electromagnetic switching valve 40 for switching the flow state of the hydraulic oil to the hydraulic cylinder 2 based on each of the above detection information, and an example of a work clutch for interrupting transmission to the seedling planting device 4. An example of a clutch motor 43 for switching the fertilizing clutch 42 for intermittently transmitting power to the planting clutch 41 and the fertilizer application device, an electromagnetic cylinder 30 for releasing the holding mechanism 29, and an actuator for switching the operating lever 31 from the raised position to the neutral position. And an actuator for switching the operation lever 31 from the lowered position to the neutral position.
The operation of the electromagnetic cylinder 45 is controlled.

The planting clutch 41 is provided with a planting switch 46, such as a limit switch or a proximity switch, as third detecting means for detecting the appearance of the transmission state and outputting it to the control device 36. The fertilizing clutch 42 is equipped with a fertilizing switch 47 such as a limit switch or a proximity switch that detects the appearance of the transmission state and outputs it to the control device 36. The control device 36 includes a planting switch 44 and a fertilizing switch 45. Based on detection from
It is an example of an actuator that switches the second electromagnetic cylinder 45 and the operation lever 31 from the left marker selection position to the neutral position, and is an example of an actuator that switches the operation lever 31 from the right marker selection position to the neutral position. The operation of the fourth electromagnetic cylinder 49 is controlled.

The control operation of the control device 36 will be described with reference to the flowcharts of FIGS. 3 and 4. When the operation of the operation lever 31 to the raised position is detected by the first switch 32, the control device 36 performs electromagnetic switching. By switching the valve 40 to a supply state in which hydraulic oil is supplied to the hydraulic cylinder 2 and shortening the hydraulic cylinder 2, the seedling planting device 4 is raised toward a predetermined upper limit position, and the seedling planting is performed by the upper limit switch 38. As the arrival of the attachment device 4 to the predetermined upper limit position is detected, the first electromagnetic cylinder 44 is operated to switch the operation lever 31 from the raised position to the neutral position, and the next operation of the operation lever 31 is performed. Enable operation,
The electromagnetic switching valve 40 is switched to a stop state in which the flow of hydraulic oil to the hydraulic cylinder 2 is stopped to stop the operation of the hydraulic cylinder 2, so that the seedling planting apparatus 4 is automatically stopped at a predetermined upper limit position. .

The seedling planting device 4 is operated by the upper limit switch 38.
When the detection of the operation lever 31 at the raised position by the first switch 32 is stopped until the arrival at the predetermined upper limit position is detected, the electromagnetic switching valve 40 is immediately switched to the stopped state to switch the hydraulic cylinder 2 By stopping the operation, the seedling planting device 4 is stopped at a position where the seedling planting device 4 is being lifted until reaching the predetermined upper limit position.

Conversely, when the operation of the operating lever 31 to the lowered position is detected by the second switch 33, the electromagnetic switching valve 4
0 is switched to a discharge state in which the hydraulic oil is discharged from the hydraulic cylinder 2 to extend the hydraulic cylinder 2, thereby lowering the seedling planting device 4 toward a predetermined planting position. 4 is reached (the vertical swing angle of the sensor float 15 detected by the float sensor 39 falls within a dead zone width of a preset reference vertical swing angle).
Accordingly, the second electromagnetic cylinder 45 is operated to switch the operation lever 31 from the lowered position to the neutral position,
The next operation of the operation lever 31 is enabled, and the electromagnetic switching valve 40 is switched to the stop state to stop the operation of the hydraulic cylinder 2, whereby the seedling planting device 4 is automatically stopped at a predetermined planting position. ing.

If the second switch 33 does not detect the operation lever 31 at the lowered position until the float sensor 39 detects that the seedling planting device 4 has reached the predetermined planting position, the operation is immediately started. By switching the electromagnetic switching valve 40 to the stop state and stopping the operation of the hydraulic cylinder 2, the seedling planting device 4 is stopped at the lowering position until reaching the predetermined planting position.

Incidentally, when the float sensor 39 detects that the seedling planting device 4 has reached the predetermined planting position, the control device 36 moves the sensor float 15 up and down, which changes with the running of the body. When it is detected by the float sensor 39 that the angle deviates from the dead band width of the reference vertical swing angle, the vertical swing angle of the sensor float 15 is set so as to fall within the dead band width of the reference vertical swing angle. Based on the detection information from the float sensor 39, the operation of the electromagnetic switching valve 40 is controlled to perform automatic raising and lowering control for automatically raising and lowering the seedling planting apparatus 4, thereby changing the undulation of the muddy surface of the field. Regardless, the seedling planting device 4 can be maintained at a predetermined planting position.

On the other hand, the controller 36 controls the float sensor 3
9, the operation lever 31 switched from the lowered position to the neutral position by the operation of the second electromagnetic cylinder 45 based on the detection that the seedling planting device 4 has reached the predetermined planting position.
As the next operation of the second switch 3
3 again, the clutch motor 43 is operated to switch the planting clutch 41 and the fertilizing clutch 42 from the disengaged state to the transmission state, thereby activating the seedling planting apparatus 4 and the fertilizing apparatus 5 and the planting switch 46. As the transmission state of the planting clutch 41 and the fertilization clutch 42 is detected by the fertilizer application switch 47, the second electromagnetic cylinder 45 is operated to switch the operation lever 31 from the lowered position to the neutral position. Thus, the next operation on the operation lever 31 is enabled.

The operation of the operating lever 31 switched from the lowered position to the neutral position by the operation of the second electromagnetic cylinder 45 based on the fact that the float sensor 39 detects that the seedling planting device 4 has reached the predetermined planting position. As the next operation,
When the operation to the left marker selection position is detected by the third switch 34, the left electromagnetic cylinder 30 for releasing the holding mechanism 29 for holding the left drawing marker 26 in the non-operating posture is operated, and the left drawing is performed. Switching of the marker 26 to the operating position is permitted, and the clutch motor 43
Is operated to switch the planting clutch 41 and the fertilizing clutch 42 from the cut-off state to the transmission state, so that the seedling planting device 4 can be operated.
The third electromagnetic cylinder 48 is operated by operating the fertilizer application device 5 and detecting the appearance of the transmission state of the planting clutch 41 and the fertilizing clutch 42 by the planting switch 46 and the fertilizing switch 47. By switching the lever 31 from the left marker selection position to the neutral position, the next operation on the operation lever 31 is enabled.

Conversely, the operation lever 31 switched from the lowered position to the neutral position by the operation of the second electromagnetic cylinder 45 based on the fact that the float sensor 39 detects that the seedling planting device 4 has reached the predetermined planting position. When the operation to the right marker selection position is detected by the fourth switch 35 as the next operation, the right electromagnetic cylinder 30 that operates to release the holding mechanism 29 that holds the right drawing marker 26 in the non-operative position is operated. The right drawing marker 26 is allowed to switch to the operating position, and the clutch motor 43 is operated to set the planting clutch 41 and the fertilizing clutch 4.
The seedling planting device 4 and the fertilizer application device 5 are operated by switching 2 from the cut-off state to the transmission state, and the appearance of the transmission state of the planting clutch 41 and the fertilizing clutch 42 is detected by the planting switch 46 and the fertilizing switch 47. By operating the fourth electromagnetic cylinder 49 to switch the operation lever 31 from the right marker selection position to the neutral position,
The next operation on the operation lever 31 is enabled.

Even when the seedling planting device 4 and the fertilizer application device 5 are operated, the above-described automatic elevating and lowering operation is performed because the float sensor 39 detects that the seedling planting device 4 has reached the predetermined planting position. Control is continued,
As a result, the seedling planting apparatus 4 can be maintained at the planting position regardless of the change in the ups and downs of the mud surface of the field, so that the seedlings can be stably planted at the preset planting depth.

When the operation of the operating lever 31 to the raised position is detected by the first switch 32 while the float sensor 39 detects that the seedling planting device 4 has reached the predetermined planting position, When the automatic raising / lowering control is finished and the appearance of the transmission state of the planting clutch 41 and the fertilizing clutch 42 is detected by the planting switch 45 and the fertilizing switch 46, the clutch motor 43
Is operated to switch the planting clutch 41 and the fertilizing clutch 42 from the transmission state to the cut-off state, so that the seedling planting apparatus 4 can be operated.
After the operation of the fertilizer application device 5 is stopped, the electromagnetic switching valve 40 is switched to the supply state to raise the seedling planting device 4 toward a predetermined upper limit position.

With the above arrangement, if the operating lever 31 is switched to the lowering position, a forced lowering operation for automatically lowering the seedling planting device 4 to a predetermined planting position can be performed. By switching the operation lever 31 that has been returned to the neutral position when the attachment device 4 reaches the predetermined planting position to the left marker selection position or the right marker selection position in consideration of the next traveling route, seedling planting is performed. The device 4 and the fertilizer application device 5 can be operated, and the drawing marker 26 located on the side of the next traveling route can be switched to the working posture. In a field, a straight-line planting operation state suitable for performing a normal planting operation can be easily exhibited.

The operation lever 31 that has been returned to the neutral position when the seedling planting device 4 has reached the predetermined planting position by the above-described forced lowering operation is again switched to the lowering position. Since the seedling planting device 4 and the fertilizing device 5 can be operated while holding the inactive posture, the planting work is performed without forming the next running reference line by the drawing marker 26.
A round planting work state suitable for performing a round planting operation along a ridge just before the end of the work can easily appear.

In these working states, the operating lever 31 that has been returned to the neutral position with the appearance of the transmission state of the working clutch 41 is switched to the ascending position, whereby the seedling planting device 4 and the fertilizing device 5 can be stopped, the seedling planting device 4 can be raised toward a predetermined upper limit position, and when one of the drawing markers 26 is in the working posture, the drawing marker 26
Can be switched to the non-operative position by raising the seedling planting device 4, so that the planting work is interrupted and the seedling planting device 4 is positioned at the upper limit position. A non-working state suitable for the vehicle can be easily brought out.

Further, until the seedling planting device 4 reaches the predetermined upper limit position or the predetermined planting position, the operating lever 31 that has been switched to the raised position or the lowered position is returned to the neutral position, so that the seedling can be planted. Since the device 4 can be stopped at a desired height, the user can perform an arbitrary lifting operation such as raising and lowering the seedling planting device 4 to a height at which maintenance and the like can be easily performed.

In short, the boarding operation section 14 is provided with a single operation lever 31 and has a simple structure in which the operation state is simply linked so that the control device 36 can recognize the operation state.
By operating the operation lever 31, a forced lifting operation for automatically raising or lowering the seedling planting device 4 to a predetermined upper limit position or a predetermined planting position, and an optional lifting operation for raising or lowering the seedling planting device 4 to a desired height position are performed. And the seedling planting device 4 can be easily positioned at a suitable planting position or maintenance position.
The above-described straight planting operation state, rotation planting operation state, and non-working state can be easily displayed, and as a result, while the operation structure is simplified and the manufacturing cost is reduced, the seedling planting operation can be performed. The operability when raising and lowering the device 4 and the operability when switching the work state can be improved, and the maintainability can be improved.

The operation lever 31 is held at the raised position while the seedling planting device 4 is being raised, and is held at the lowered position while the seedling planting device 4 is being lowered. Alternatively, when a predetermined planting position is reached, the operating position is switched from the raised position or the lowered position to the neutral position.
By visually recognizing the operation position 1, it is possible to easily grasp the elevating state of the seedling planting device 4 without looking at the seedling planting device 4 connected to the rear part of the traveling machine 1. Attachment device 4
Can be switched to the operating state of the seedling planting device 4 only in a state where the seedling planting device 4 has reached the predetermined planting position. The generation of abandoned seedlings caused by switching from the stage to the operating state can be avoided.

[Other Embodiments] Hereinafter, other embodiments of the present invention will be listed. (1) The paddy field working machine may be a direct sowing machine or a weeding machine constructed by connecting a direct sowing device or a weeding device as an example of the working device 4 to the rear of the traveling machine body 1 so as to be able to drive up and down. Alternatively, the working device 4 may be equipped with the fertilizer device 5 and configured to have a rear-mount fertilizer specification, or may not be equipped with the fertilizer device 5.

(2) In a state where the working device 4 is located at a desired height position, for example, the operation of the operating lever 31 to the descending position twice within a predetermined time is performed by the second switch 33. When detected, the control device 36 operates the clutch motor 43 to switch the work clutch 41 from the disengaged state to the transmission state, and activates the work device 4 positioned at a desired height position. The state may be switched.

According to this configuration, the operation adjustment of the working device 4 can be performed in a state where the working device 4 is located at a desired height position, so that the maintainability can be improved. The work can be performed by connecting a non-grounding type working device 4 such as a medicine spraying device in place of the grounding type working device 4 such as a medicine spraying device.

(3) The operation lever 31 may be configured to be held in position when operated to the ascending position or the descending position, and to return to neutral when operated to each of the left and right marker selection positions. Further, a one-way swing type that can be operated from a neutral position to a raised position and a lowered position may be used.

(4) When the operation lever 31 is operated to the left and right marker selection positions, the control device 36 does not operate the work device 4 but moves to the action posture of the drawing marker 26 corresponding to the operation position. May be configured to allow switching.

(5) A wiper motor or the like may be used as the actuators 44, 45, 48, 49 for switching the operation lever 31 to the neutral position.

(6) The first detecting means 38 for detecting the reaching of the working device 4 to the predetermined upper limit position, or the second detecting means 39 for detecting the reaching of the working device 4 to the predetermined working height position.
As an alternative, a rotary potentiometer or the like for detecting the vertical swing angle of the link mechanism 3 may be employed.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a control configuration.

FIG. 3 is a flowchart showing a control operation of the control device.

FIG. 4 is a flowchart showing a control operation of the control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 4 Working device 31 Operating lever 36 Control device 38 First detecting means 39 Second detecting means 41 Working clutch 44 Actuator 45 Actuator 46 Third detecting means

Claims (2)

[Claims] 1. A paddy field working machine having a working device connected to a traveling machine so as to be able to drive up and down, and a control device for controlling the lifting and lowering of the working device, comprising: a position-holding type operating lever; An actuator for switching the working device to a neutral position, first detecting means for detecting that the working device has reached a predetermined upper limit position, and second detecting means for detecting that the working device has reached a predetermined working height position. Equipped, the control device raises the working device when the operating lever is switched to the raised position, lowers the working device when the operating lever is switched to the lowered position, and switches the operating lever to the neutral position When the arrival of the work device is detected by the first detection means or the second detection means, the actuator is actuated. Paddy working machine that is configured to switch the operating lever to the neutral position. 2. The vehicle according to claim 1, further comprising third detection means for detecting the appearance of the transmission state of the work clutch for intermittently transmitting power to the work apparatus, wherein the control device controls the actuator based on the detection of the second detection means. When the switching operation to the lowered position is performed as a next operation of the operation lever switched to the neutral position by the operation, the operation clutch is switched to the transmission state, and based on the detection of the third detection unit, The paddy working machine according to claim 1, wherein the operation lever is switched to a neutral position by operating the actuator.