JPH0584004A - Control unit in paddy working vehicle - Google Patents

Abstract

PURPOSE:To provide the title control unit of simplified, compact structure, so designed as to put a cam plate clutch-actuating part to combined use for positioning. CONSTITUTION:With a single operating lever 20, a hydraulic pressure control valve 23 is actuated along with setting a planting clutch 36 'on' and 'off'. Energization is made with a spring so that the roller 31 for a cam arm 30 come into contact with the clutch-actuating part 22b for a cam plate 22, and the planting clutch is set 'on' and 'off', whereas, the cam plate is positioned at a specified 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 work vehicle such as a passenger rice transplanter, and more particularly to a control device for vertically moving and controlling a working unit such as a planting unit and for connecting and disconnecting a working clutch.

[0002]

2. Description of the Related Art Generally, a passenger rice transplanter is equipped with an operating lever which can be operated at a manual operation position and an automatic position, and the operation of the operation lever at the manual operation position controls the elevation of a planting section, and At the automatic position of the operation lever, a planting (working) clutch is connected to operate the planting section, and the planting section is placed in a proper planting position by sensing earth pressure acting on the float. Automatic lifting control.

[0003] And, conventionally, for example, the actual exploitation Sho 62-178.
As shown in Japanese Patent No. 818, the applicant of the present invention connects the operation lever to a control member formed of a cam plate having a positioning control surface and a clutch operation surface, and further connects the control unit to a connecting rod and an arm. We proposed a control system for a passenger rice transplanter that was connected to a hydraulic control valve for raising and lowering the planting section via a continuous lifting member. In the control device, when the operation lever is operated to the automatic position, the clutch operation surface of the control member operates the planting clutch to the connection position, and the positioning restriction surface is biased by the spring. The hydraulic control valve is held at the position when the roller is inserted, and the hydraulic control valve is allowed to move based on the interchange mechanism consisting of the long hole formed in the continuous draft rod, and the hydraulic control valve is operated by the vertical movement of the float. To do. Further, when the operation lever is raised and operated to a fixed manual operation position, the clutch operation surface of the control member operates the planting clutch to the disengagement position, and the positioning restriction surface holds it at that position. Through the hydraulic control valves to the raised and fixed positions respectively.

[0004]

However, the above-described control device positions and holds the control member itself (cam plate) in addition to abutting the roller at the tip of the arm linked to the planting clutch to the control member (cam plate). Therefore, it is necessary to contact the roller supported by the tip of the arm urged by the spring. For this reason, the structure is complicated, and it is necessary to form the positioning regulation surface on the side surface of the control member in addition to the operation surface of the planting clutch, and the control member itself has a large and complicated shape. In addition, the combination of these causes a lack of space-saving property, and there is a risk of causing trouble particularly when applied to a small rice transplanter.

Further, in addition to operating the operating lever and the arm for operating the planting clutch, it is necessary to operate against the biasing force of the roller specially provided for positioning, which makes the operation heavy.

Therefore, according to the present invention, the roller provided on the arm for the work clutch is also used for positioning,
It is an object of the present invention to provide a control device for a paddy field vehicle that solves the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a traveling unit (5) has a working section (1).
0) is lifted and lowered by a hydraulic cylinder device (16), and the working unit is driven via a working clutch (36),
Further, in a working vehicle in which a hydraulic control valve (23) for controlling the hydraulic cylinder device and the working clutch (36) are operated by one operating lever (20), the working vehicle is pivotally supported by the traveling machine body (5). And the operation lever (2
0) and is connected to the hydraulic control valve (23).
A flat plate-shaped control member (22) linked to the operating portion (25) of the work clutch (3) through a predetermined interchange mechanism (f), and the working clutch (3
6) A roller (3) that is connected to and is supported by the tip of the roller (3)
1) is provided with an arm (30) biased by a spring (35) so as to come into contact with the control member (22), and the roller (31) is provided on a side surface of the control member (22). ) To disengage the work clutch (36).
A positioning / clutch operating portion (22b) for contacting and positioning the control member at a predetermined position is provided.
It is characterized by

[0008]

According to the above construction, when the operation lever (20) is operated to the respective positions of raising (U), fixing (N), (automatic) lowering (D) and automatic (A), the control member (22) is operated. It rotates according to each position of the lever (20). In the automatic position (A) of the control member (22), the positioning / clutch operating portion (22b) is operated so as to connect the working clutch (36), and the valve operating member (25) is operated by the interchange mechanism (f). ) And therefore float (1
4) It is automatically operated based on the vertical movement of the work unit (10).
Is automatically controlled up and down. At this time, the roller (31)
Is engaged with the large concave portion (a) of the positioning / clutch operating portion (22b) and swings the arm (30) largely, thereby connecting the working clutch (36) and connecting the control member (22). Position and hold the automatic position (A).

When the control member (22) is raised (U), fixed (N) and lowered (D), the roller (3) is used.
1) rides on the land portion (c) of the positioning / clutch operating portion (22b) to disconnect the work clutch (36), and in the raising (U) and lowering position (D),
The roller (31) is fitted in the small recesses (c ₁ ) and (c ₂ ) formed in the land portion, and is controlled by the biasing force of the spring (35) acting on the arm (30).
Hold 2) in that position.

[0010]

As described above, according to the present invention,
Arm (30) and roller (3) for operating the work clutch
Since 1) is also used for positioning, the arm and roller for exclusive use of positioning which are conventionally required are not necessary, and the control member (22) does not require a restricting surface for exclusive use of positioning, and the shape is simplified. In addition, it can be formed in a small size, and in combination with these, the structure of the entire control device can be greatly simplified and the size can be reduced. Further, based on the downsizing, it can be easily arranged also in the operation part of the paddy field working vehicle that does not have a space to enter, for example, the operation part of the driver's seat (9) side of a small passenger rice transplanter, In particular, when the arm (30) is arranged vertically in such a manner as to face the side of the control member (22), the space in the vertical direction is small, and the control device can be applied to a small riding rice transplanter having no room in the vertical direction. Can be easily arranged.

Further, since the control member (22) does not need a regulating surface dedicated to positioning, it can be assigned to other functions, and functions such as hydraulic control can be enhanced.

Further, since the control member (22) only comes into contact with the roller (31) for the work clutch (36) and does not come into contact with the positioning roller conventionally required, it is more than the conventional one. As a result, the operation of rotating the control member (22) becomes lighter, the manual operation by the operation lever (20) becomes lighter, and the operation such as auto return becomes reliable.

Further, when a small convex portion (b) is provided between the clutch connecting large concave portion (a) and the clutch disconnecting land portion (c) in the clutch operating portion (22b) of the control member (22), the clutch is formed. When the roller (31) goes over the small convex portion (b) at the time of turning on and off, the spring (35) is once stretched and urged, and even if there is friction or the like at the linking portion, the work clutch (36) is surely engaged. It can be turned on and off, and when the clutch is switched from the connected state to the disengaged state, the roller (31) passes through the small convex portion (b), so that an overstroke is once made and the clutch (36) is surely made. Can be cut.

The reference numerals in parentheses above are for the purpose of comparison with the drawings, but do not limit the structure of the present invention.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the riding rice transplanter 1 has a traveling machine body 5 supported by front wheels 2 and rear wheels 3. The traveling machine body 5 has an engine 6 mounted at its front end portion. In addition, a driver's seat 9 having a seat 7 in the rear portion is provided. Further, a planting part 10 is supported at the rear of the traveling machine body 5 via links 8a and 8b so as to be able to move up and down, and a large number of planters 11, ..., Floats 14 and seedling stand 12 are mounted on the planting part 10. It is equipped. Further, a hydraulic cylinder device 16 is provided between the rear end portion of the traveling machine body 5 and the bracket 15 fixed to the upper link 8a, and based on expansion and contraction of the hydraulic cylinder device 16 by a hydraulic control valve described later. The planting unit 10 moves up and down. In addition, on the left and right of the planting section 10, line drawing markers 17 ₁ ,
17 ₂ is arranged so that it can be tilted up and down (see FIGS. 13 and 14).

As shown in detail in FIGS. 2 to 4, a driver's seat 9 is provided with a planting part raising / lowering operation lever 20 on the side of the seat 7, and the operation lever is provided on the side of the seat. It is guided by a guide groove 19a formed in the guide plate 19. In addition, the frame 5 that constitutes the machine body 5
An L-shaped plate 21 in a front view is fixed to a seat column 5b erected at a via a bracket. Below the upper plate of the plate 21, the inside of the side plate, that is, the plate 2 is fixed.
A hydraulic control valve 23 is arranged inward of the L-shape of 1, and an operation shaft 23a of the valve 23 extends to the outside of a side plate of the plate 21, and a valve operation plate 25 is fixed there. On the other hand, a cam plate 22 constituting a control member is rotatably supported by a support shaft 26 on a side plate of the plate 21,
A lug 22a bent perpendicularly to the body of the cam plate 22
The operation lever 20 is rotatably supported via a pin 27. Therefore, the operation lever 20 is supported by the support shaft 26 integrally with the cam plate 22 so as to be rotatable in the longitudinal direction of the machine body, and is also supported by the pin 27 so as to be swingable in the left-right direction. Further, the cam plate 22, the hydraulic control valve 23, and the valve operation plate 25 are arranged so as to overlap each other in a side view.

As shown in FIGS. 4 and 5, the flat cam plate 22 includes an operating lever connecting portion including the lug 22a, a planting clutch operating portion 22b, and a hydraulic control portion 22c.
And an auto-return operating portion including an arc-shaped elongated hole 22d centered on the support shaft 26. The planting clutch operating portion 22b is composed of a cam surface that comes into contact with a roller 31 rotatably supported at the tip of the cam arm 30, and has a large concave portion a into which the roller fits and a land portion from the large concave portion to the small convex portion b. It has a small recess c ₁ formed in c and a recess c ₂ formed at the end of the land c. Also, the hydraulic control unit 22c
Is a concave portion f that receives the pin 25a implanted in the valve operating plate 25, allows the pin 25a to move within the concave portion to form an interchange mechanism (automatic range), and forms one side surface f _{1 of the} concave portion. The pin 25a is brought into contact with and moved integrally (manual range).

The operating shaft 23a of the hydraulic control valve 23
In the valve operating plate 25 that is fixedly installed in the valve operating plate, the pin 25a implanted in the operating plate is directly operated by the hydraulic control unit 22c of the cam plate 22, and therefore the hydraulic control valve 23 is directly controlled by the cam plate 22. And a highly responsive planting part 10
The recess f that constitutes the accommodation mechanism can be directly formed in the cam plate 22, and the accommodation width can be set to a large value as necessary.
By setting the automatic range of 3 to a large value, it is possible to perform quick automatic lifting control.

On the other hand, a support shaft 3 is provided on the side plate of the plate 21.
2, the arm 30 is rotatably supported,
The other end of the arm 30 has a rod 33 having a long hole 33a.
And a spring 35 for connection to a planted clutch arm 36, which operates the planted clutch. Further, the spring 35 operates the planted clutch against the built-in spring of the clutch, and the reaction thereof acts from the roller 31 to the clutch operating portion 22b of the cam plate 22 via the rod 33 and the arm 30. Therefore, the clutch operating portion 22b also operates the planting clutch 36 and also serves as a positioning mechanism for holding the cam plate 22 at a predetermined position by pressing the roller 31 biased by the spring 35. ing. Further, since the clutch operating portion 22b also serves as a restricting surface for maintaining the position of the clutch operating portion 22b of the clutch, the cam plate 22 can be configured compactly and the restricting surface portion can be assigned to another function. It is possible to enhance the functions such as hydraulic control.

A float interlocking arm 36 having an inverted L-shape in a side view is rotatably supported on the valve operating shaft 23a, and a tip end of the arm 36 is, as shown in FIGS. The plate 37, the arm 39, and a sensing rod 40 and a link 41 are connected to the tip portion of the float 14. On the other hand, a linking pin 25b is planted in the cam plate 25 so as to project inward, and the pin 25b can abut and interlock with the arm 36. Also, the pin penetrates and projects to the outside of the cam plate 25, and the pin 25b '
A spring 43 is stretched between the arm 42 and the pin 42 planted in the arm 39, and urges the pin 25b to abut and interlock with the arm 36. Also, plate 2
Another spring 45 is stretched between the pin 1 and the pin 42, and the spring 45 presses and biases the float 14 toward the rice field. On the other hand, a hydraulic sensitivity adjusting lever 46 is rotatably supported on the plate 21 in the longitudinal direction of the machine body, and the lever 46 is guided by a sensitivity adjusting guide groove 19b of the guide plate 19 and extends laterally of the seat. .. The sensitivity adjusting lever 46 is connected via a Bowden wire 47 to a link length adjusting device 49 provided on the link 41 (see FIG. 2). By operating the adjusting lever 46, the float 14 is tilted forward. The angle can be manipulated to adjust the sensitivity of the earth pressure acting on the float. It should be noted that reference numerals 48 and 48 in FIG. 4 are stoppers that come into contact with the pin 42 and regulate the movement amount of the float 14.

A plate 50 is fixed to the plate 21 so as to project obliquely rearward and downward. The tip of the plate 50 is bent, and a bolt 51 is slidably fitted into the bent portion 50a. ing. Head portion and bent portion 50 of the bolt 51
A spring 52 is contracted between the bolt 51 and a, and the rod 52 for auto return is provided inside the bent portion of the bolt 51.
Is fixed and the nut 51c is screwed, and the protrusion amount of the bolt 51 is regulated so as to be adjustable. Furthermore,
A pin 53 fixed to the other end of the rod 52 is fitted into the long hole 22d for auto-return to allow the cam plate 22 to rotate a predetermined amount, and the movement of the rod 52 causes the cam plate 22 to move to a predetermined position. It can be forcibly moved from a raised position to a fixed position. Further, a lug 8c is fixedly installed on the lower link 8b of the lifting link that supports the planting section 10 (Fig. 3,
8), the lug 8c at a predetermined elevated position of the planting section 10
Comes into contact with the bolt 51 for auto return and the planting portion 10
The rod 52 is moved along with the rise of the. Further, as shown in FIG. 4, a spring 55 is stretched between the operation lever 20 and the pin 54 fixed to the plate 21,
At the time of the automatic return, the operation lever 20 is configured to be guided from the raised position to the fixed position along the oblique side surface h of the guide groove 19a. In the figure, 56 is
It is a hook lever for holding the valve operating plate 25 in a fixed position.

On the other hand, as shown in FIGS. 9 and 10, the operation lever 20 extends further in the lateral direction (inside the body) than the pivot pin 27, and extends vertically in the tip of the extension portion 20a. The short pin 20b is fixed. A marker switching lever 57, which constitutes a marker switching device, is swingably supported on the upper plate of the plate 21 about a pin 59 in a horizontal plane. The marker switching lever 57
Has long holes 59a, 59b formed of an arc centered on the pin 59 on both sides of the pin 59, and a cap 57 'fixed by adjusting bolts 60, 60.
And an engaging hole 57c is formed between and. The engagement hole 57
In c, the operation lever is automatically in the guide groove 19a (work).
The vertical pin 20b is set to be engaged in the position A.

A support shaft 61 is horizontally supported by a lug 21c cut and raised on the upper plate of the plate 21. The support shaft 61 has marker stoppers 62 ₁ , which constitute left and right marker holding means. 62 ₂ is rotatably supported in parallel with the front-rear direction. These left and right marker stoppers 62
_1, 62 ₂ are made of the same shape, and with are arranged side by side facing upward, the projecting members each having a semicircular stopper cam surface 63a around the support shaft 61 6
3 is fixed by a bolt, and a winding spring 65 is erected.
Is urged in the counterclockwise direction in FIG. And
Connecting rods 66 ₁ and 66 ₂ are connected to the marker stoppers 62 ₁ and 62 ₂ , respectively, and tips 66 a and 66 a of these connecting rods are bent to form left and right long holes 59 a and 59 b of the marker switching lever. It is inserted.
In addition, stopper collars 66b and 66b are respectively fixed to the intermediate portions of the connecting rods 66 ₁ and 66 ₂ to hold the left and right marker stoppers 62 ₁ and 62 ₂ at a predetermined standing position, and at the neutral position of the marker switching lever 57. In, the rod tip 66a is located at one end of the elongated holes 59a, 59b. Further, the urging force based on the spiral springs 65 and 65 is applied to the rods 66 ₁ and 66 ₂ and the switching lever 57.
It acts on the operation lever 20 via the lever to urge the lever to the neutral position n.

A support shaft 67 extending in the horizontal direction is provided at the upper end of the seat column 5b, and the two marker drive arms 69 ₁ and 69 ₂ rotate around the support shaft in parallel with the front-rear direction. It is movably supported. These marker driving arms have the same plate shape, and the cam surface 63 is attached to the tip thereof.
rollers 70 engageable in a is rotatably supported by pins 69a, and are respectively connected a marker connecting wires 71 _1, 71 ₂ on the projecting portion, is constituted that the contact portion 69b to further base ing. Also, the link 8 for raising and lowering the planting part
A marker return arm 72 is integrally fixed to the base portion of a, and the roller 72a provided at the tip of the arm 72 abuts on the abutting portions 69b of the left and right marker drive arms 69 ₁ and 69 ₂ , and these The arm can be rotated together. And
As shown in FIGS. 13 and 14, the left and right marker connecting wires 71 ₁ and 71 ₂ are connected to the left and right markers 17 ₁ and 17 ₂ , respectively.
, And these markers are biased by springs to the working position in which they fall to the left and right, and are switched to the non-working position in which they are erected by the pulling action of the wires 71 ₁ and 71 ₂ .

Next, the operation of this embodiment will be described.

To plant the riding rice transplanter 1, the operator operates the operating lever 20 to the automatic (working) position A while sitting on the seat 7. In this state, as shown in FIG. 5, the cam plate 22 rotates integrally with the operation lever 20, the roller 31 of the cam arm 30 is fitted into the large recess a, and the valve is provided in the recess f forming the interchange mechanism. Operation board 2
5 pin 25a is located. Then, the cam arm 30 is rotated via the rod 33 in a direction to loosen the spring 35, whereby the planted clutch arm 36 is rotated and the planted clutch is connected by its built-in spring. Also,
The valve operating plate 25 can freely rotate without being restricted by the cam plate 22 at the interchange position where the pin 25a does not abut on both side surfaces of the recess f. In this state, the vertical movement of the float 14 based on the earth pressure sensing is transmitted to the float interlocking arm 36 via the link 41, the sensing rod 40, the arm 39 and the plate 37, and further the spring 43 causes the arm 36 to move. It is transmitted to the valve operating plate 25 via the pin 25b that is in contact with one side of the valve operating plate 25.

Therefore, the traveling body 5 sinks and the float 1
When the earth pressure acting on the valve 4 increases and the front portion of the float 14 moves upward against the spring 45, the valve operating plate 2
5 operates the hydraulic control valve 23 to the underlap and the raising position of the automatic range, supplies the hydraulic pressure to the hydraulic cylinder device 16 and raises the planting part 10. On the contrary, when the front part of the float 14 moves downward, the valve operating plate 25 operates the valve 23 to the underlap of the automatic range and the lowered position common to the manual range, and drains the hydraulic pressure of the hydraulic cylinder device 16. The planting part 10 is lowered. When the float 14 is in the predetermined neutral state, the valve 23 is in the neutral position of the automatic range, and holds the planting part 10 in that position.
Therefore, in the riding rice transplanter 1, the planting clutch is connected and the planting unit is connected in a state where the planting unit 10 descends above the rice field and is automatically controlled to a predetermined working position based on the earth pressure acting on the float 14. 10 is driven, that is, the seedling stand 12 reciprocates left and right and the planter 11 rotates, so that the seedlings are planted on the rice field at a constant depth.

At this time, the cam plate 22 is held at the automatic position A because the roller 31 is fitted in the large recess a, so that the operating lever 20 integrated with the cam plate 22 is also automatically positioned. Held in. In addition, the operating lever 20
When the roller 31 is operated from the neutral position direction to the automatic position A, the roller 31 is fitted into the large concave portion a from the land portion c through the small convex portion b. At this time, the spring 35 is temporarily moved based on the small convex portion b. Since the spring 35 is stretched and then the spring 35 is contracted at a stretch, the operation of the planting clutch is urged to securely connect and operate. In particular, when the cam lever 30 is connected to the planting clutch arm 36 via a wire, the planting clutch can be reliably operated regardless of the friction of the wire.

Next, as shown in FIG. 6, the operating lever 2
When 0 is operated to the lowered position D, the cam plate 22 also rotates integrally. In this state, the roller 31 of the cam arm 30 is located in the small recess c ₁ of the land c, and the valve operating plate 25
Pin 25a is still located in the interchange recess f. Then, the cam arm 30 rotates in the clockwise direction to extend the spring 35 via the rod 33, and the urging force of the spring overcomes the spring with built-in planting clutch to rotate the planting clutch arm 36. Disengage the clutch and operate. Further, the valve operating plate 25 is in a position where it can move freely, as in the automatic (working) position A, and the planting part 10 is in a descending position where the float 14 is landing on the rice field.

At this time, the urging force of the spring 35 acts on the cam arm 30 as a reaction to cause the roller 31 to move.
Is pressed into the small recess c ₁ . As a result, the cam plate 22 is held at the lowered position, and the operating lever 20 and the valve operating plate 25 are also held at the position together with the cam plate. Further, when the roller 31 rides on the small concave portion c ₁ of the land portion c, the roller 31 crosses the small convex portion b, but at this time, the spring 35 once expands greatly due to the overstroke of the cam arm 30, and the large load of the spring 35 by this. The planted clutch can be reliably disengaged. Therefore, in this state (down position D), the planting unit 10 is in the predetermined lowered (automatic) state, but the planting clutch is disengaged.

As shown in FIG. 7, the operating lever 20
When is operated to the fixed (neutral) position N, the cam plate 22 also rotates integrally. In this state, the roller 31 of the cam arm 30 is on the land portion c of the cam plate 22, the planting clutch (arm) 36 is in the disengaged state, and one side surface f _{1 of the} recess f is the valve operation. The operation plate 25 is integrally rotated by contacting the pin 25a of the plate 25, and the valve operation shaft 23a
The hydraulic control valve 23 is rotated to the neutral position of the manual operation range via. Then, the valve 23 stops supplying / discharging the hydraulic pressure to stop the hydraulic cylinder device 16. Generally, the fixed position N is operated with the planting part 10 raised, so that the planting part float 14 is in a hanging state, but the float of the float transmitted through the sensing rod 40 and the arm 39. The descending amount is determined by the pin 42 fixed to the arm 39.
Are regulated by abutting on the stopper 48 fixed to the seat column 5b.

When the passenger rice transplanter 1 is run on the road,
In order to reliably hold the neutral position N, the hook lever 56 is tilted from the solid line position in FIG. 7 to the chain line position in the neutral state of the operation lever 20. Then, the plate 56 a rotates integrally with the hook 56 and comes into contact with one side surface of the valve operating plate 25. In the this state, the valve operation plate 25 is rotated in the clockwise pin 25a is restricted by contact with the side surface f ₁ of the cam plate 22, and rotation in the counterclockwise direction plates 56a
The valve operating plate 25 is reliably held at the neutral position N by the control.

Further, as shown in FIG.
When is moved to the raised position U, the cam plate 22 also rotates integrally. In this state, the roller 3 is inserted in the concave portion c _{2 of the} cam plate.
1 is fitted and the pin 25a is in contact with one side surface f ₁ of the recess f due to the spring 43, the cam operating plate 25 is rotated integrally with the cam plate 22 to operate the hydraulic control valve 23. Rotate and operate to the raised position in the manual range. Therefore, the hydraulic control valve 23 changes the hydraulic pressure to the hydraulic cylinder device 16
To raise the planting part 10. Also at this time, the cam arm 30 is also the roller 31 is fitted into the concave portion c _2, recesses c ₂ In the position far from the support shaft 26, a spring 35
Is held in the extended state, and the planted clutch (arm) 3
6 is maintained in the off position, and the pressing force of the roller 31 based on the reaction force of the spring 35 acts on the concave portion c ₂ to cause the cam plate 22 and hence the hydraulic control valve 2 integral therewith.
3 and the operating lever 20 are held in the raised position. At this time, the float 14 hangs down as the planting part 10 rises.
Is abutted against the stopper 48, and the arm 36 is left at a predetermined position via the plate 37, the pin 25b moves away from the arm 36 and the cam plate 2
It is interlocked by 2.

Then, as the planting section 10 rises, the link 8
When b is rotated upward by a predetermined amount, the lug 8c comes into contact with the auto-return bolt 51. Further, as the link 8b rotates, the bolt 51 moves against the spring 52,
The pin 53 at the tip of the rod 52 contacts the end of the elongated hole 22d through the rod 52 to rotate the cam plate 22 in the clockwise direction. Then, the positioning and holding due to the roller 31 being fitted into the concave portion c ₂ is released, the cam plate 22 is rotated by the upward rotation of the link 8b, and the operation lever 20 is rotated integrally with this. At this time, the operation lever 20 is laterally rotatably supported by the pin 27 and the biasing force of the spring 55 causes the lever 20 to move along the oblique side surface h (see FIG. 4) of the guide groove 19a. ., From the raised position U to the neutral position N, which is an engagement step, and stops at the neutral position N. As a result, when the riding rice transplanter 1 reaches the headland, the operator operates the operation lever 20 to the raised position U, and raises the planting unit 10, the planting unit 10 is raised by a predetermined amount, and the above-described automatic operation is performed. The return device functions and is automatically returned to the neutral position N, and the planting part 10 is held at the predetermined raised position.

Next, the left and right line drawing markers 17 ₁ , 17
The switching operation of ₂ will be described. In the working state of the riding rice transplanter, _one of the left and right markers 17 ₁ and 17 ₂ is at the working position in the laid state, and a line is drawn on the rice field on the unplanted side. In this state, the marker drive arm 69 ₁ or 69 ₂ connected to the marker on the laid side is shown in FIG.
As shown in, the marker driving arm 69 ₂ or 69 ₁ connected to the marker in the solid line position and in the upright state.
Means that the roller 70 has a marker stopper 62 ₂ or 62 ₁
It is held in a chain line state by abutting on the cam surface 63a of the protruding member 63.

Then, when reaching the headland and operating the operating lever 20 to the raised position U as shown in FIG. 11, the planting portion 10 is raised as described above and the link 8a is moved upward as shown by the solid line. The drive arm 69 ₂ or 69 ₁ in which the roller 72a supported at the tip of the marker return arm 72 that rotates in the direction
Against the contact portion 69b abuts pivots the solid line position the drive arm from the chain line position, in which the winding spring vine said cam stopper roller 70 is brought into contact with the projecting member 63 of the cam stopper 62 ₂ or 62 ₁ The protrusion member 6 is rotated against 65.
When it exceeds 3, the cam stopper returns to the predetermined upright position by the spiral spring, and the stopper cam surface 63a moves to the roller 7
By engaging 0, the marker drive arm 69 ₂ or 69 ₁ is held in the solid line position. As a result, the drive arm 69 causes the marker 17 _{2 to} pass through the wire 71 ₂ or 71 _1.
Alternatively, 17 ₁ is moved from its lying position to the standing position.

Then, when the planting portion 10 reaches a predetermined raised position, the operation lever 20 is operated by the above-mentioned automatic return device.
Is returned from the raised position U to the fixed position N. As shown in FIG. 12, at the fixed position N and the lowered position D, the planting portion 1
Even if 0 is lowered, the vertical pin 20b at the tip of the operating lever 20
However, it does not engage with the engagement hole 57c of the marker switching lever 57, the left and right marker stoppers 62 ₁ and 62 ₂ are in the standing position, and the rollers 70 of the left and right marker driving arms 69 ₁ and 69 ₂ are stopper cams. The left and right markers 17 ₁ and 17 ₂ are held in an upright state at a position where they abut on the surface 63a.

When the riding rice transplanter 1 has finished traveling on the headland,
When the work is started again, the operation lever 20 moves to the cam plate 22.
Automatically moved to the automatic position A
The planting part 10 descends on the rice field as described above. The automatic position A of the operating lever 20 is as shown in FIG.
As shown in 0, the vertical pin 20b at the tip of the lever engages with the engagement hole 57c of the marker switching lever 57. Then, in this state, as shown in FIG.
At the automatic position A of the guide groove 19a, when the pin 27 is rotated in the left-right direction along the lateral groove i that expands in the left-right direction, the lever 20 tip portion 20a bent substantially at a right angle.
The vertical pin 20b provided on the vertical shaft 20b swings in the front-rear direction, and the switching lever 57 engaged with the vertical pin 20b has a pin 59b.
It swings on a horizontal plane centering around.

For example, when the operation lever 20 is rotated in the right direction R in FIG. 9, the marker switching lever 57 is rotated counterclockwise and the rod 66 ₁ engaged with the long hole 59a.
Winding the right marker stopper 62 ₁ through the spring 6
5. Rotating against 5, the stopper cam surface 63a of the roller 70
The right elbow is released to allow the right drive arm 69 ₁ to rotate. Then, the right marker 17 ₁ urged to the laid position by the spring lays down to the working position. In addition,
When the switching lever 57 rotates in the counterclockwise direction, the pin 66a of the rod 66 ₂ does not operate at all because the elongated hole 59b only loosely moves. Therefore, the left marker stopper 62 ₂ is in the upright position and the left drive arm 69 is in the upright position. ₂ is in the stopper engagement position, and the left marker 17 ₂ is held in the standing position.

On the contrary, when the operation lever 20 is rotated in the left direction L in FIG. 9, the marker switching lever 57 is rotated clockwise around the pin 59, and the rod 62 ₂ contacts the end of the long hole 59b. Moves in contact with the left marker stopper 62 ₂
Rotate. As a result, the left marker drive arm 69 ₂ is freely rotated by releasing the elbow of the stopper cam surface 63a, and the left marker 17 ₂ falls down to the working position. Then, when reaching the headland and operating the operating lever 20 to the raised position U, the marker at the working position is returned to the standing position as described above.

[Brief description of drawings]

FIG. 1 is an overall side view showing a riding rice transplanter to which the present invention is applied.

FIG. 2 is a side view showing the entire operating device.

FIG. 3 is a plan view thereof.

FIG. 4 is a plan view showing an operating portion of a lifting hydraulic pressure and a clutch.

FIG. 5 is a side view showing a planting operation state.

FIG. 6 is a side view showing a state where the planting part is lowered.

FIG. 7 is a side view showing a fixed state of a planting part.

FIG. 8 is a side view showing a raised state of a planting part.

FIG. 9 is a plan view showing a switching operation portion of left and right markers.

FIG. 10 is a side view showing a planting operation state.

FIG. 11 is a side view showing a state where the planting part is raised.

FIG. 12 is a side view showing a fixed state and a lowered state of a planting part.

FIG. 13 is a plan view showing the entire part of the marker operating device.

FIG. 14 is a side view thereof.

[Explanation of symbols]

1 Working vehicle (passenger rice transplanter) 5 Traveling machine 10 Working part (planting part) 14 Float 16 Hydraulic cylinder device 20 Operating lever 22 Control member (cam plate) 22a Connecting part (lug) 22b Positioning / clutch operating part 22c Hydraulic operation part a clutch connection (large recess portion) b small protrusions c clutch disengagement portion (land portion) c _1, c ₂ recesses f interchange mechanism f ₁ abutment surface (side surface) 23 hydraulic control valve 25 the operation member (the valve operating plate) 25a Engagement member (pin) 36 Work (planted) Clutch (arm)

Claims (1)

[Claims] 1. A hydraulic control valve and a working clutch for controlling the hydraulic cylinder device by driving the working part through a working clutch while supporting the working part on a traveling machine body by a hydraulic cylinder device. In a work vehicle operated by a book operation lever, a flat plate shape pivotally supported by the traveling machine body, connected to the operation lever, and linked to an operation portion of the hydraulic control valve via a predetermined accommodation mechanism. A control member, and an arm that is biased by a spring so that a roller that is connected to the work clutch and that is supported at the tip of the work clutch contacts the control member, and a side surface of the control member. Further, a positioning / clutch operating portion for contacting the roller to disconnect / contact the working clutch and positioning the control member at a predetermined position is provided. Controller paddy field working vehicle according to claim.