JP2002078407A - Implement in paddy field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable both of an arbitrarily lifting/lowering operation and a forced lifting/lowering operation with a simplified structure, reducing a production cost and improving operability. SOLUTION: This implement in a paddy field, having a working device 4 connected to a traveling machine body 1 so as to be driven, and lifted and lowered, and a controller 36 for controlling the lifting and lowering of the working device 4 based on the operation of a neutral-returning type operation lever 31 arranged in a riding and driving part 14, is constituted so that the controlling mode of the controller 36 may be changed between the first controlling mode of automatically lifting the working device 4 to a prescribed upper limit position according to the operation of the operation lever 31 to the operation position at the upper part, and automatically lowering the working device 4 to the prescribed working height position according to the operation of the operation lever 31 to the operation position at the lower part, and the second controlling mode of lifting the working device 4 only while the operation lever 31 is operated to the upper operation position, and lowering the working device 4 only while the operation lever 31 is operated to the lower operating position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work apparatus which is connected to a traveling machine so as to be able to drive up and down, and controls the elevation of the work apparatus based on the operation of a neutral return type operation lever provided in a boarding operation section. The present invention relates to a paddy working machine equipped with a control 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 separately from an operation lever of a neutral return type. Control lever is provided, and the control device executes a control mode of performing an arbitrary lifting operation to raise or lower the working device to a desired height position based on the operation of the position-holding type operation lever, and executes the control mode. When the holding type operation lever is operated to the automatic position, the lifting device is automatically raised or lowered automatically to the predetermined upper limit position or the predetermined work height position based on the operation of the neutral return type operation lever. It was configured to execute a control mode for performing an operation.

[0003]

However, according to the above prior art, a position holding type operation lever for arbitrarily lifting and lowering the working device and a neutral return type operation lever for forcibly lifting and lowering the working device are provided. In addition, it is necessary to link each control lever to the control device via a dedicated link structure so that the control device can recognize the operation state of those control levers. Inconvenience that the cost is increased is caused, and there is room for improvement in operability since the two types of operation levers are selectively used to perform an arbitrary lifting operation and a forced 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 the lifting and lowering of the working device based on the operation of a neutral return type operating lever provided in the boarding operation unit, the control mode of the control device is set such that the operating lever operates upward. The operating device is automatically raised to a predetermined upper limit position as the operating device is operated to a position, and the operating device is moved to a predetermined working height position as the operating lever is operated to a lower operating position. A first control mode in which the operating device is automatically moved down to the first operating mode, and the operating device is raised only while the operating lever is being operated to the upper operating position, and only while the operating lever is being operated to the lower operating position. It is configured to be switchable to the second control mode for lowering the working device.

According to the first aspect of the present invention, by switching the control mode executed by the control device, the working device is controlled based on the operation position of the neutral return type operation lever provided in the riding operation section. And a state in which the working device is raised or lowered to a desired height position based on the operation position and operation time of the operation lever. Will be able to do it.

That is, although the boarding operation section is provided with a single operation lever and has a simple structure in which the operation state of the operation lever is simply linked so that the control device can recognize the operation state, the operation of the operation lever enables It is possible to perform a forced lifting operation for automatically raising or lowering the working device to a predetermined upper limit position or a working height position, and an arbitrary lifting operation for raising or lowering the working device to a desired height position.

[Effect] Accordingly, it is possible to perform an arbitrary lifting operation and a forced lifting operation of the working device while simplifying the operation structure, reducing the manufacturing cost, and improving the operability.

[Structure] According to a second aspect of the present invention, in the first aspect of the invention, a changeover switch for switching the control mode is provided near the operation lever.

According to the second aspect of the present invention, it is possible to switch the control mode executed by the control device by operating the changeover switch disposed near the operation lever.

[Effect] Accordingly, the operability when switching the control mode executed by the control device can be improved.

[Structure] According to a third aspect of the present invention, in the first aspect of the present invention, the operation lever is provided with a changeover switch for switching the control mode.

According to the third aspect of the present invention, the control mode executed by the control device can be switched by operating the changeover switch provided on the operation lever. Since there is no need to secure a dedicated arrangement place, it is possible to make the design advantageous.

[Effect] Therefore, the operability when switching the control mode executed by the control device can be more effectively improved, and the design can be made more advantageous.

[Structure] According to a fourth aspect of the present invention, in the third aspect of the present invention, a return switch is employed as the changeover switch, and while the changeover switch is not operated, The control mode is switched to the first control mode, and the control mode is switched to the second control mode while the changeover switch is being operated.

According to the fourth aspect of the present invention, when the operating lever is operated to one of the upper and lower operating positions without operating the changeover switch, the working device is moved to the predetermined upper limit position or the upper limit position based on the operating position. A first control mode for automatically ascending or descending to the working height position is executed. When the operating lever is operated to one of the upper and lower operating positions while operating the changeover switch, the working device is operated based on the operating position and the operating time. Second to raise or lower to the desired height position
The control mode is executed.

That is, when raising or lowering the working device to a desired height position, it is necessary to operate the operation lever to the upper or lower operation position while operating the changeover switch. It is possible to recognize whether the elevating state of the working device appearing by the operation is the forced elevating operation state in the first control mode or the arbitrary elevating operation state in the second control mode. It is possible to prevent a wrong elevation operation state from appearing due to the operator mistaking the operation state of the changeover switch, which may be caused when a position holding type switch is employed. become.

[Effect] Therefore, it is possible to improve the operability of preventing the appearance of an incorrect elevating operation state.

[Structure] According to a fifth aspect of the present invention, in the first aspect of the present invention, it is preferable that the operation time of the operation lever to one of the upper and lower operation positions is within a predetermined time. The control mode is switched to the first control mode, and when the operation time of the operation lever to one of the upper and lower operation positions exceeds a predetermined time, the control mode is switched to the second control mode. Configured.

According to the fifth aspect of the present invention, the control mode executed by the control device is switched based on the operation time of the operation lever to the upper or lower operation position. There is no need to provide a dedicated operation tool for switching.

[Effect] Accordingly, the operation structure can be simplified, the manufacturing cost can be reduced, and the operability can be further improved, and the design can be made more advantageous.

[Structure] According to a sixth aspect of the present invention, in the first aspect of the present invention, in the first control mode, the working device is controlled by the working height. As the next operation of the operation lever operated to the lower operation position to automatically lower the operation device to the lower position, when the second operation to the operation position below the operation lever is performed, the control device causes the operation device to The work clutch for interrupting transmission is switched to the transmission state, and in the second control mode, when the operation lever is continuously operated to the lower operation position twice within a predetermined time, the control device transmits the work clutch. It was configured to switch to the state.

According to the sixth aspect of the present invention, in any of the first control mode and the second control mode, the operating device can be switched to the operating state by operating the neutral return type operation lever. Since it is possible, there is no need to provide a dedicated operating tool for switching the working device to the operating state.

In the first control mode, when the working device is switched to the operating state, the working device is always located at the predetermined working height position. And the second
In the control mode, for example, the working device can be switched to the operating state after the working device is raised and lowered to a desired height position where the operating state of the working device can be easily visually recognized, so that the maintenance of the working device becomes easy to perform.

Therefore, regardless of the control mode, the operation state of the working device can be switched to the operating state by operating the neutral return type operation lever, so that the operation structure is simplified, the manufacturing cost is reduced, and the operability is improved. Can be more effectively achieved, and the maintainability can be improved.

[Structure] According to a seventh aspect of the present invention, in the first aspect, in the first control mode, the operating lever is moved forward or backward. When the control device is operated to the operation position, the control device controls the holding mechanism corresponding to the operation direction of the operation lever among the left and right holding mechanisms that hold the left and right drawing markers in a non-acting posture in which the tip is separated from the field. Switching to a non-holding state, allowing the drawing marker held by the holding mechanism to be switched to an operating posture in which the tip of the drawing marker enters the field, and transmitting a work clutch for interrupting transmission to the working device. State, and in the second control mode, when the operation lever is operated to one of front and rear operation positions, the control device responds to the operation direction of the operation lever. By switching the holding mechanism to a non-holding state, and configured to permit switching to the working position of the drawing marker that has been held by the holding mechanism.

According to the seventh aspect of the invention, in the first control mode, when the operation lever is operated to any one of the front and rear operation positions, the drawing marker corresponding to the operation direction of the operation lever is set. Since the switching to the working posture is permitted and the working device is switched to the operating state, it is suitable for performing a normal straight traveling work such as forming the next running reference line in the field while operating the working device. It is possible to show the straight running state.

In the second control mode, when the operation lever is operated to any one of the front and rear operation positions, the switching to the operation posture of the drawing marker corresponding to the operation direction of the operation lever is permitted. Since the working device is not switched to the operating state, the working device is not operated and the next running reference line is formed in the field. Will be able to appear.

That is, although the boarding operation section is provided with a single operation lever and has a simple structure in which the operation state of the operation lever is simply linked so that the control device can recognize the operation state, the operation of the operation lever enables The straight work state and the preparation work state can be easily displayed.

[Effect] Therefore, it is possible to further improve the operability in which the straight traveling state and the preparation state can be easily displayed while simplifying the operation structure and reducing the manufacturing cost. It became so.

[0031]

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, a plurality of terrain floats 15 preliminarily lands the seedling planting places with the traveling of the machine body, while 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 fertilizer applicators 5 receive a plurality of working power from the gear type transmission 9. 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.

At the front of the traveling body 1, a pair of left and right drawing markers 26 are provided around 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. A position change operation is possible, and in the use position, an operating posture in which the tip enters the field to form the next travel reference line, and a non-operating posture in which the tip is separated from the field and approaches the traveling machine 1 At the same time, it is equipped so that the posture can be switched around the longitudinal axis P3.

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. In addition, when each of the holding mechanisms 29 is selectively switched to the non-holding state by the operation of the electromagnetic cylinder 30 corresponding to each of the holding mechanisms 29, the posture switching to the working posture is allowed. In the state, the lowering operation of lowering the seedling planting device 4 to the predetermined planting position, which is the predetermined working height position, is performed, or the lowering operation of lowering the seedling planting device 4 to the predetermined planting position is performed. Later, when the non-holding state selectively appears, the drawing marker 26 on the selected side is switched to the operating posture by the bias of the spring 28.

At the lower right of the steering wheel 12,
An operation lever 31 of a cross swing type and a neutral return type is provided. The operation of the operation lever 31 to an operation position above the operation lever 31 is detected by a first switch 32, and an operation to a lower operation position is performed by a first switch 32. The ON operation is detected by the second switch 33, the operation to the front operation position is ON detected by the third switch 34, the operation to the rear operation position is ON detected by the fourth switch 35, and each of the switches 32 to 35
Outputs the respective detection information to a control device 36 including a microprocessor mounted on the traveling body 1.

A push-button type holding switch 37 is provided at the tip of the operating lever 31, and the switching switch 37 outputs operation information to the control device 36.

As shown in FIG. 2, an upper limit switch 38 for detecting the arrival of the seedling planting device 4 at a predetermined upper limit position by being pressed by the link mechanism 3 is provided at the rear of the traveling body 1. A predetermined leveling float (hereinafter abbreviated as a sensor float) 15 detects the vertical swing angle around its axis P1 to detect the arrival of the seedling planting device 4 at a predetermined working height position. Is equipped with a float sensor 39 composed of a rotary potentiometer.
8 and the float sensor 39 output their detection information to the control device 36.

The control device 36 switches the control mode to be executed based on the operation information of the changeover switch 37, and switches the flow state of the hydraulic oil to the hydraulic cylinder 2 based on each detection information. The clutch motor 43 that switches between the planting clutch 41, which is an example of a work clutch that interrupts transmission to the attachment device 4, and the fertilization clutch 42, which interrupts transmission to the fertilizer application device 5, and the holding mechanism 29 is set in the non-holding state. It is configured to control the operation of the switching operation of the electromagnetic cylinder 30, and the like.

The control operation of the control device 36 will be described with reference to the flowcharts of FIGS. 3 and 4. The control device 36 determines the operation state of the changeover switch 37 from the operation information of the changeover switch 37, and the changeover switch 37 is pressed. The control mode to be executed while in the release position is the first control mode.
The control mode is switched to the control mode, and the control mode to be executed is switched to the second control mode when the changeover switch 37 is located at the pressing operation position.

In the first control mode, the operation lever 3
When the operation to the operation position above the first position is detected by the first switch 32 to be ON, the control device 36 sets the upper limit switch 38
The electromagnetic switching valve 40 is switched to a supply state in which hydraulic oil is supplied to the hydraulic cylinder 2 by shortening the operation of the hydraulic cylinder 2 until the arrival of the seedling planting device 4 at the predetermined upper limit position is detected as ON. The planting device 4 is automatically raised to a predetermined upper limit position, and when the upper limit switch 38 detects that the seedling planting device 4 has reached the predetermined upper limit position, the electromagnetic switching valve 40 is set to the hydraulic cylinder 2. The hydraulic cylinder 2 is deactivated by switching to a stop state in which the flow of hydraulic oil is stopped to perform a forced ascending control for positioning the seedling planting device 4 at a predetermined upper limit position.

Conversely, when the operation of the operation lever 31 to the lower operation position is detected by the second switch 33 to be ON, the control device 36 causes the float sensor 39 to transmit the seedling planting device 4.
Until the predetermined planting position is detected (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). By switching the electromagnetic switching valve 40 to a discharge state for discharging hydraulic oil from the hydraulic cylinder 2 and extending the hydraulic cylinder 2, the seedling planting device 4 is automatically lowered toward a predetermined planting position, and the float sensor 3
As the arrival of the seedling planting device 4 at the predetermined planting position is detected by 9, the electromagnetic switching valve 40 is switched to a stopped state and the operation of the hydraulic cylinder 2 is stopped, thereby setting the seedling planting device 4 at a predetermined position. The forced lowering control is performed so as to be positioned at the planting position.

In this forced lowering control, the arrival of the seedling planting device 4 at the predetermined planting position is determined by the float sensor 39.
Is detected by the controller 36, the vertical swing angle of the sensor float 15, which changes with the travel of the aircraft, deviates from the dead band width of the reference vertical swing angle. Automatic raising and lowering of the seedling planting device 4 by controlling the operation of the electromagnetic switching valve 40 based on the detection information from the float sensor 39 at that time so that the angle falls within the dead band width of the reference vertical swing angle. The control is started, whereby the seedling planting apparatus 4 can be maintained at a predetermined planting position regardless of a change in the ups and downs of the mud surface of the field.

As the next operation of the operation lever 31 that has been operated to the lower operation position in order to execute the forced lowering control, the second operation to the lower operation position is detected by the second switch 33 to be on. And the control device 36 operates the clutch motor 43 to switch the planting clutch 41 and the fertilizing clutch 42 from the disconnected state to the transmission state, thereby operating the seedling planting device 4 and the fertilizing device 5 to control the work state appearance. It is supposed to do.

As the next operation of the operation lever 31 operated to the lower operation position to execute the forced lowering control, when the operation to the front operation position is detected by the third switch 34 to be ON, the control is performed. The device 36 operates the electromagnetic cylinder 30 that operates to switch the holding mechanism 29 that holds the left drawing marker 26 in the non-operating posture to the non-holding state,
The left marker switching control for permitting the switching of the left drawing marker 26 to the action posture is performed, and the above-described work state appearance control is performed.

Conversely, when the operation to the rear operation position is detected as ON by the fourth switch 35 as the next operation of the operation lever 31 operated to the lower operation position to execute the forced lowering control, The control device 36 operates the electromagnetic cylinder 30 that switches the holding mechanism 29 that holds the right drawing marker 26 in the non-operating state to the non-holding state, thereby allowing the right drawing marker 26 to switch to the working posture. In addition to performing the right marker switching control, the work state appearance control described above is performed.

Note that the automatic raising and lowering control described above is continued when these working states appear, and the seedling planting device 4 can be maintained at a predetermined planting position regardless of the change in the ups and downs of the muddy surface of the field. The seedlings can be stably planted at a preset planting depth.

When these working states appear, the operation of the operation lever 31 to the upper operation position is performed by the first switch 32.
Is detected, the control device 36 operates the clutch motor 43 to switch the planting clutch 41 and the fertilizing clutch 42 from the transmission state to the disconnected state, thereby stopping the operation of the seedling planting device 4 and the fertilizing device 5. In addition to performing the non-work state appearance control, the forced ascent control described above is performed.

On the other hand, in the second control mode, the operation to the operation position above the operation lever 31 is performed by the first switch 32.
When the ON is detected by the control device 36, the control device 36 switches the electromagnetic switching valve 40 to the supply state only while the detection is continued, that is, while the operation lever 31 is operated to the upper operation position. 2 to shorten the operation, the seedling planting device 4 is raised, and its detection is stopped. That is, as the operation to the operation position above the operation lever 31 is released, the electromagnetic switching valve 40 is stopped. By switching and stopping the operation of the hydraulic cylinder 2, arbitrary raising control for positioning the seedling planting device 4 at a desired raising position is performed.

Conversely, when the operation of the operation lever 31 to the lower operation position is detected by the second switch 33 to be ON, the controller 36 continues to perform the detection, that is, when the operation lever 31 is in the lower position. Only while being operated to the operation position, the electromagnetic switching valve 40 is switched to the discharge state to extend the hydraulic cylinder 2, thereby lowering the seedling planting device 4,
When the detection is stopped, that is, when the operation of the operation lever 31 to the operation position below is released, the electromagnetic switching valve 4
0 is switched to a stop state to stop the operation of the hydraulic cylinder 2 to perform an arbitrary lowering control for positioning the seedling planting device 4 at a desired lowering position.

Then, within a predetermined time, the operation lever 3
When the second switch 33 detects that the button 1 has been operated to the lower operation position twice consecutively, the control device 36
Performs the above-described work state appearance control. In this work state appearance, when the operation of the operation lever 31 to one of the upper and lower operation positions is detected by the first switch 32 or the second switch 33, In addition to performing the above-mentioned non-work state appearance control, arbitrary lifting control according to the operation detection is performed.

When the operation of the operation lever 31 to the operation position in front of the operation lever 31 is detected by the third switch 34 to be on, the control device 36 performs the above-described left marker switching control, and conversely, the control device 36 at the rear of the operation lever 31 When the operation to the operation position is detected by the fourth switch 35 to be on, the control device 36 performs the above-described right marker switching control.

With the above arrangement, when the operation lever 31 is operated to the lower operation position while the changeover switch 37 is located at the release position, the forced lowering operation for automatically lowering the seedling planting device 4 to the predetermined planting position is performed. Can do
After the forced lowering operation, when the changeover switch 37 is switched to the pressing operation position and the operation lever 31 is operated to one of the front and rear operation positions in consideration of the next traveling route, the seedling planting device 4 and the fertilizer application device 5 are moved. Since the drawing marker 26 located on the next traveling route side can be switched to the working posture without being operated, the next traveling reference line is formed on the field by one of the drawing markers 26 without performing the planting operation. A preparatory work state suitable for securing a round planting work path to be performed just before the end of the work at the stage before the start of the planting work can be easily displayed.

After the above-described forced lowering operation, if the operation lever 31 is operated to one of the front and rear operation positions in consideration of the next traveling route while the changeover switch 37 is in the depressed position. , Seedling planting device 4 and 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, so that the next running reference line is formed on the field by one of the drawing markers 26 while performing the planting operation.
Thus, it is possible to easily bring out a straight-ahead work state suitable for performing a normal planting work.

Further, when the operation lever 31 is again operated to the lower operation position while the changeover switch 37 is in the depressed position after the forced lowering operation described above, the left and right drawing markers 26 are deactivated. Since the seedling planting device 4 and the fertilizer application device 5 can be operated while being held in the posture, the planting work is performed without forming the next running reference line by the drawing marker 26. A rotation planting operation state suitable for performing the rotation planting operation along can easily appear.

In these working states, with the changeover switch 37 in the depressed position, the operation lever 31 is moved.
Is operated to the upper operation position, a forced ascending operation for automatically raising the seedling planting device 4 to the predetermined upper limit position can be performed, and when the seedling planting device 4 and the fertilizer application device 5 are operating, The operation can be stopped, and when one of the drawing markers 26 is in the working posture, the drawing marker 26 can be switched to the non-working posture. A non-working state suitable for performing headland turning or the like during work traveling, such as placing the planting device 4 at the upper limit position, can easily appear.

When the changeover switch 37 is switched to the pressing operation position and the operation lever 31 is operated to one of the upper and lower operation positions, an arbitrary elevating operation for raising or lowering the seedling planting device 4 to a desired height position is performed. Since the operation timing of each planting mechanism 18 in the seedling planting apparatus 4 can be adjusted, the seedling planting apparatus 4 is raised or lowered to a desired height position where it is easy to visually recognize the operation timing. Arbitrary elevating operation for raising or lowering the seedling planting device 4 to a desired height position suitable for performing such operations can be easily performed, and the switch 37 is switched to the pressing operation position. When the operating lever 31 is continuously operated downward to the operating position twice within a predetermined time, the seedling planting device 4 located at a desired height position suitable for performing maintenance or the like is operated. Since it is possible, with each planting mechanism 18
It is possible to easily check the operation timing and the like.

In addition, a non-grounding type working device 4 such as a chemical spraying device (not shown) is connected to the rear portion of the traveling machine body 1 via a link mechanism 3 so as to be able to drive up and down instead of the seedling planting device 4. In this case, the changeover switch 37 is switched to the pressing operation position and the operation lever 31 is operated to one of the upper and lower operation positions, whereby the non-grounded working device 4 is operated.
Can be easily raised or lowered to a desired height position suitable for the work, and the operation lever 31 can be moved downward while the changeover switch 37 is switched to the pressing operation position. By operating the operating position twice consecutively within a predetermined time, the non-grounding type working device 4 located at a desired height position suitable for the operation can be operated, and the changeover switch 37 is pressed. Momentarily operating the operation lever 31 to one of the upper and lower operation positions in the state where the operation device is switched to the operation position, thereby stopping the operation of the non-grounding type working device 4 without greatly changing its height position. Is available.

In short, by switching the control mode executed by the control device 36 by the changeover switch 37 provided on the operation lever 31, the single operation lever 31 is provided in the boarding operation unit 14, and the operation state thereof is controlled by the control device 36. Is a simple structure in which the working device 4 can be automatically moved up or down to a predetermined upper limit position or a predetermined planting position by operating the operation lever 31 while having a simple structure that can only be linked so as to be able to recognize. Work device 4 can be raised or lowered to the height position of the work device 4 regardless of whether it is a grounded type such as a seedling planting device or a non-grounded type such as a chemical spraying device. It can be easily positioned at a suitable working height position or maintenance position. The state and the non-working state can be easily displayed. As a result, the operability and the working state when raising and lowering the working device 4 can be achieved while simplifying the operation structure and reducing the manufacturing cost. In addition, it is possible to improve the operability when switching and appearing, and also to improve the maintainability, and it is also possible to suitably achieve a multi-purpose rice transplanter.

[Other Embodiments] Other embodiments of the present invention will be listed below. (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 configured to have a rear-mount fertilization specification in which the fertilizer application device 5 is provided.

(2) As shown in FIG.
7 may be arranged near the operation lever 31.

(3) As the changeover switch 37, a rotary type or a swing type switch may be employed, and a return type switch may be employed in place of the holding type switch, so that the operator Alternatively, it may be possible to make the user aware of whether the state appearing by the operation is in the first control mode or the second control mode.

Incidentally, when the return type changeover switch 37 is employed in the above-described embodiment, when the operation lever 31 is operated to the lower operation position without pressing the changeover switch 37, the seedling planting apparatus is not operated. 4 can be automatically lowered to a predetermined planting position. After the forced lowering operation, the operating lever 31 is moved to one of the front and rear positions in consideration of the next travel route while pressing the changeover switch 37. When the operating position is set to the operation position, the seedling planting device 4
In addition, the drawing marker 26 located on the side of the next traveling route can be switched to the working posture without operating the fertilizer application device 5, and the above-described preparatory work state can be brought out.

When the operating lever 31 is operated to any one of the front and rear operation positions in consideration of the next traveling route without depressing the changeover switch 37 after the above-described forced lowering operation, the seedling planter 4 In addition, the fertilizer applicator 5 can be operated, and the drawing marker 26 located on the side of the next traveling route can be switched to the operating posture, so that the above-described straight-ahead working state can be brought out.

Further, when the operation lever 31 is again operated to the lower operation position without pressing the changeover switch 37 after the above-described forced lowering operation, the seedling is maintained while the left and right drawing markers 26 are kept in the non-operation position. Planting device 4 and fertilizer device 5
Can be operated, and the above-mentioned rotation planting operation state can be revealed.

In these working states, the operating lever 3
By operating 1 to the upper operation position, a forced ascending operation for automatically raising the seedling planting device 4 to the predetermined upper limit position can be performed, and when the seedling planting device 4 and the fertilizer application device 5 are operating. Can deactivate them,
When one of the drawing markers 26 is in the working posture, the drawing marker 26 can be switched to the non-working posture, so that the above-mentioned non-working state can be displayed.

When the operating lever 31 is moved to one of the upper and lower operating positions while pressing the changeover switch 37, the seedling planting device 4 and the drug spraying device connected thereto are replaced to the desired height position. An arbitrary elevating operation for raising or lowering can be performed. When the operating lever 31 is continuously operated downward to the operating position twice while pressing the changeover switch 37 within a predetermined time, the operating lever 31 is moved to the desired height position. When the operation lever 31 is momentarily operated to one of the upper and lower operation positions while pressing the changeover switch 37, the seedling planting device 4 or the chemical spraying device can be operated.
The operation of the seedling planting device 4, the chemical spraying device, and the like can be stopped without greatly changing the height position.

(4) Instead of providing the changeover switch 37, the control device 36 may be configured to switch the control mode to be executed based on the operation time of the operation lever 31.

The configuration is, for example, as shown in FIGS.
As shown in the flowchart of FIG. 3, the control device 36 operates the first switch 3 to move the operation lever 31 to the upper operation position.
2, when it is determined that the operation time is within a predetermined time, if the operation time is within the predetermined time, the control mode to be executed is switched to the first control mode, When the operation time exceeds a predetermined time, the control mode to be executed is switched to the second control mode, and the operation lever 31 is moved upward. When the second switch 33 detects that the operation of the operation position below the operation lever 31 has been turned on by the second switch 33, the operation time is increased. Is determined to be within a predetermined time, and if the operation time is within the predetermined time, the control mode to be executed is switched to the first control mode, and the seedling planting device 4 is moved to a predetermined planting position. When the operation time exceeds a predetermined time, the control mode to be executed is switched to the second control mode, and the seedlings are moved only while the operation lever 31 is operated to the lower operation position. Arbitrary lowering control for lowering the planting device 4 is performed, and the operation lever 3
When the operation to the operation position in front of 1 is detected by the third switch 34 to be ON, it is determined whether or not the operation time is within a predetermined time, and if the operation time is within the predetermined time, The control mode to be executed is switched to the first control mode, the left marker switching control allowing the switching of the left drawing marker 26 to the working posture, and the work state appearance control for operating the seedling planting device 4 and the fertilizer application device 5. If the operation time exceeds a predetermined time, the control mode to be executed is switched to the second control mode, and only the above-described left marker switching control is performed. 4 When it is detected by the switch 35, it is determined whether or not the operation time is within a predetermined time. If the operation time is within the predetermined time, the control mode to be executed is set to the first control mode. Rikae Te, the right side of the drawing marker 26
Control to allow the switching to the action posture of the right and the work state appearance control for operating the seedling planting device 4 and the fertilizer application device 5, and when the operation time exceeds a predetermined time, the control to be executed. It is conceivable to switch the mode to the second control mode and perform only the above-described right marker switching control.

(5) The boarding operation unit 14 may be provided with a display for allowing the operator to recognize the control mode being executed.

[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.

FIG. 5 is a block diagram showing a control configuration of another embodiment in which a changeover switch is provided near an operation lever.

FIG. 6 is a flowchart showing a control operation of a control device according to another embodiment without a changeover switch;

FIG. 7 is a flowchart showing a control operation of a control device according to another embodiment without a changeover switch;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 4 Working device 14 Boarding operation part 26 Drawing marker 29 Holding mechanism 31 Operating lever 36 Control device 37 Changeover switch 41 Working clutch

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Daisaku Inai 64 Ishizukita-cho, Sakai-shi, Osaka F-term in Kubota Sakai Works (reference) 2B043 AA01 AB02 AB11 BA02 BB06 CA03 CB15 EB13 EC14 EC15 ED11 2B062 AA02 AA11 AA14 AB01 AB07 BA22 BA33 BA62 CA03 CA04 CA05 CA16 2B304 KA03 KA08 LA02 LA09 LB05 LB16 MA02 MC11 MD07 PA09 PA11 PB05 QA03 QC04 RA01

Claims (7)

[Claims] A paddy field having a control device for connecting a working device to a traveling body so as to be able to drive up and down, and for controlling lifting and lowering of the working device based on an operation of a neutral return type operation lever provided in a boarding operation unit. A work machine, wherein the control mode of the control device is automatically raised to a predetermined upper limit position with the operation lever being operated to an upper operation position, and the operation lever is moved downward. A first control mode for automatically lowering the working device to a predetermined working height position as the working device is operated to the operating position, and the working device only while the operating lever is operated to the upper operating position. And a second control mode in which the operating device is lowered while the operating lever is being operated to the lower operating position. 2. The paddy working machine according to claim 1, further comprising a changeover switch for changing over the control mode in the vicinity of the operation lever. 3. The paddy working machine according to claim 1, wherein the operation lever is provided with a changeover switch for changing over the control mode. 4. A return type switch is employed as the changeover switch, wherein the control mode is switched to the first control mode while the changeover switch is not operated, and while the changeover switch is operated. The paddy working machine according to claim 3, wherein the control mode is configured to switch to the second control mode. 5. When the operation time of the operation lever to one of the upper and lower operation positions is within a predetermined time, the control mode is switched to the first control mode, and the operation lever is moved to one of the upper and lower positions. The paddy working machine according to claim 1, wherein the control mode is switched to the second control mode when the operation time to the operation position exceeds a predetermined time. 6. In the first control mode, as the next operation of the operation lever operated to the lower operation position to automatically lower the operation device to the operation height position, the operation device moves to the operation position below the operation lever. When the second operation is performed, the control device switches the work clutch that interrupts transmission to the work device to the transmission state, and in the second control mode, moves the operation lever to the lower operation position within a predetermined time. The paddy working machine according to any one of claims 1 to 5, wherein the controller is configured to switch the work clutch to the transmission state when the position is operated twice consecutively. 7. In the first control mode, when the operation lever is operated to one of front and rear operation positions, the control device causes the left and right drawing markers to be held in a non-acting posture in which the leading ends thereof are separated from the field. Of the holding mechanisms, the holding mechanism corresponding to the operation direction of the operation lever is switched to a non-holding state, and the tip of the drawing marker held by the holding mechanism is moved to the action posture in which the tip of the drawing marker enters the field. In the second control mode, when the operation lever is operated to any one of the front and rear operation positions, the control device causes the control device to perform the switching. The holding mechanism corresponding to the operation direction of the operation lever is switched to a non-holding state, and the operation of the drawing marker held by the holding mechanism is performed. The paddy field working machine according to any one of claims 1 to 6, wherein switching to the posture is allowed.