JPH01108913A - Elevating controller of working part in paddy working machine - Google Patents

Abstract

PURPOSE:To obtain the subject device, capable of lifting a machine body to a desired height by manual operation to lift the machine body and displacing an operating lever on the lifting side to a lifting limit position by operation of an operating lever on the lowering side to the lowering limit position and having excellent operability. CONSTITUTION:A running clutch lever 30 is operated to a disconnecting position and a planting clutch lever 31 is operated to a position for lifting to carry out lifting of the machine body. When the machine body is lifted to a desired height, the lever 30 is operated to a fixed position to pull the lever 31 under urging force by an elastic machine (Y). The lever 31 is displaced to a fixed position where a pin of a cam arm 33 contacts the cam surface of the cam arm. Both levers 30 and 31 are almost simultaneously located at the fixed positions. Thereby an elevation control valve 13 is in a fixed state of the machine body with limited changeover to any side of lifting and lowering sides and set at just the height of the lifted machine body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for controlling the elevation of a working part of a paddy field working machine such as a rice transplanter, fertilizer, or seeding machine.

[Prior Art and Problems to be Solved by the Invention] In general, in this type of paddy field working machine, the tiller is fixed so that the attitude of the machine body with respect to the rice field does not change due to unevenness of the tiller on which the running wheels travel. By automatically switching the lift control valve based on the detection of irregularities, the running wheels are moved up and down relative to the aircraft body, thereby automatically controlling the lift movement. By the way, in this case, when the aircraft is rotating.

When traveling in reverse, replenishing seedlings, etc., it is necessary to limit the automatic switching of the elevation control valve.Therefore, conventionally, the operating device means for providing this limitation is 1. A lowering side control lever is provided to limit the lowering side of the aircraft. By the way, in such a case, it is necessary to manually raise the aircraft, so the lifting side control lever is operated to the manual raising position to enable manual lifting of the aircraft, but in this case, it is desired to raise the aircraft by one. When the height is reached, even if the raising side control lever is operated from the manual raising position to the raising limit position, when the lowering side operating lever is in the automatic control position, the valve will be switched to the lowering side by the sensing float. As a result, when the raising side control lever is operated to the upper limit position, if the lowering side control lever is not immediately operated to the lower limit position, the aircraft that has risen to the desired height will descend. It becomes a problem because it is significantly inferior in gender.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a lifting/lowering control device for a working part of a rice paddy working machine that can eliminate these drawbacks. In a paddy field working machine, the vertical movement of one machine is performed by automatic switching of a lifting control valve linked to the vertical movement of a sensing float, an operating tool means for restricting automatic switching of the lifting control valve, A raising-side operating lever that can be operated from an automatic control state to a raising-limiting position that limits the raising of the aircraft and a manual raising position that performs manual raising, and a lowering-side operating lever that limits the lowering of the aircraft from an automatic control state. In addition, when the lowering side operating lever is operated to the lowering limit position while the raising side operating lever is operated to the manual up position n, the raising side operating lever is linked to raise and limit the lowering side operating lever. It is characterized by being interlocked and connected via a linking means so as to be displaced into position.

With this configuration, when the aircraft rises to a desired height by manual lifting of the aircraft, by operating the lowering side operating lever to the lowering limit position, the raising side operating lever is moved from the manual raising position to the uppering limit position. The lift control valve is automatically displaced to a fixed state in which switching of the lift control valve to both the upper and lower directions is restricted.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is a walking type rice transplanter;
has engine 2 installed in the front.

A seedling platform 3 is provided at the rear with a low front and rear height, and planting is done in synchronization with the movement of the aircraft.The planting of claws 4 is activated, and unit planting is done by scraping seedlings from the seedling platform 3 on a circular surface. Everything else is the same as before, such as the fact that the plants are planted on the ground.

Reference numeral 5 denotes a running wheel, and the running wheel 5 has an axle 5 at the tip of a second chain case 6 constituting a bendable chain case.
The base end portion of the second chain case 6 is pivotally supported by the distal end portion of the first chain case 7 so as to be swingable (flexible). This first chain case 7 has a support shaft 7 attached to the upper part of the transmission case 8.
It is pivotably supported around a as a fulcrum. In the traveling vehicle @5, the driving force from the engine is transmitted to the transmission case 8, the first chain case 7, and the second chain case 6.
It is designed to travel and rotate by transmitting power through the . Further, it is connected to a telescopic cylinder 14 for lifting and lowering wheels, which will be described later, via a link 14a, and the one-car chain case 6.7 swings in a bent manner as a result of the swinging of the swinging arm 23 about the fulcrum 23a associated with its telescoping operation. As a result, the vehicle @5 moves up and down along a trajectory as shown in FIG.

On the other hand, reference numeral 9 denotes a sensing float (center float), and the sensing float 9 has a rear portion pivotally supported on the body side by a support shaft 9a, and a front portion supported on the body side by a bending link mechanism 10. Furthermore, the lower end of a link rod 1z is connected to the sensing float 9, and the upper end of this link rod 12 is in a state where it is constantly urged downward by the ammunition X to the lower end of the operating link 15. The operating link 15 has a long hole-shaped flexible part], 5.
a is provided, and a pin 12b that loosely fits therein is provided with a pin 12b.
It protrudes from an actuation plate 16 that is integrally provided on the valve shaft 13a of the elevation control valve 13. When the sensing float 9 swings up and down due to changes in ground pressure from the field due to changes in the unevenness of the tiller, the operating link 1 along with the link rod 12
5 moves up and down, causing the actuating plate 16 to rise (
When the plowing platform becomes deep and the machine sinks), the machine is rotated in the direction of arrow C, and when descending (the machine rises), it is rotated in the opposite direction.
When it rotates in the direction of the arrow C, the aircraft changes to the upward side, and when it rotates in the opposite direction of the arrow C, it changes to the downward side of the aircraft. The actuating plate 16, which is designed to control the vertical movement, has vertical connecting links 17 and 18 with the valve shaft 13a sandwiched between them, and pins 17b and 18b are connected to elongated flexible portions 17a and 18a. connected via. The upper second connecting link 17 is interlocked with the tip of a second hydraulic wire 37, which will be described later, and the lower first connecting link 18 is connected with the tip of a first hydraulic wire 36, which will also be described later. Further pin 18
b and the outer receiver 37a side of the second hydraulic wire 37 of the bracket la on which the outer receivers 36a, 37a of both wires 36, 37 are provided (the bracket 1a is integrally fixed to the fuselage main body side), A bullet Z is interposed to urge the actuating plate 16 in the direction opposite to C.

On the other hand, 24 is a speed change clutch lever, and the speed change clutch lever 24 is operated to its corresponding speed change position (in the embodiment, two forward speeds Fl, F2, neutral N, and reverse R ri1). , the connecting rod 25 is rotated around the axis, and the shifter shaft 26 connected to the connecting rod 25 via the link arm 26a is moved in and out of the transmission case 8, thereby causing the speed change clutch mechanism (not shown) to move as described above. A pin 24a is protruded from the speed change clutch lever 24, and this pin 24a can be freely swung toward the operating handle 20 by a pin shaft 27b. The movable plate 27 is pivotally connected to the movable plate 27, and the rear end is approximately
It penetrates through an arcuate long hole 27a which is notched in the shape.

Then, shift the shift clutch lever 24 to the neutral position as described above.
Forward from position F1. When switching between the F2 positions, the pin 24a moves within the range of the elongated hole 27a, and the movable plate 27 does not move.

Reverse position 2 from neutral position N! When operating to R, pin 2
4a comes into contact with the end of the elongated hole 27a to swing the movable body 27 in the six directions of the arrows in FIG. It is designed to be pulled and moved. Furthermore, the fulcrum 2 of the movable plate 27
7b is eccentric with respect to the arcuate fulcrum of the elongated hole 27a, so that when the transmission clutch lever 24 is operated to the reverse position, the pin 24a engages with the corner of the notch 27b at the end of the elongated hole. and shift clutch lever 2
4 is operated from the reverse R position to the neutral N position, the movable plate 27 is swung back to its original position by pressing the engaging portion. In addition, 24b is a gear shift clutch lever.
24 guides.

On the other hand, 29 is an operation case provided at the center of the upper part of the left and right operation handle 20, and a lever guide 29a is provided on the left side of the support shaft 29a provided between the left and right side plates of the operation case 29.
The boss portion 30a of the moving latch lever 30 (corresponding to the lowering side operating lever of the present invention) allows the lever to be switched between "r-in", "r-off" and "fixed" by linear operation from the hand side to the front side along the . However, on the right side, there is also a clutch lever that allows you to switch the lever between "R in", "Off", "Fix", and "Up" by linear operation from the hand side to the near side along the lever guide 29b. 31 boss portions 31a (corresponding to the raising side operating lever of the present invention) are rotatably connected. Furthermore, these boss portions 30a,
First cam arms 32, 33 are each pivotally connected to the outside of 31a. Also, both levers 30 and 31 have connecting arms 30b.
.

31b, as well as a lever pin 30c associated with the first cam arm 32, 33, second cam arm 3g, 39, as described below.
31c are provided respectively. One end of a running latch wire 34 is connected to the tip of the running-side connecting arm 30b, and one end of a clutch wire 35 is connected to the tip of the planting-side connecting arm 31b. By operating the running latch lever 30 from the R-cut position on the lever guide 29a to the ENTER position (the position operated to the frontmost side), the running latch wire 34 is pulled, thereby causing the running latch (not shown) to move. On the other hand, for planting, the clutch lever 31 is similarly operated from the "r-off" position to the "on" position in the lever guide 29b, and the clutch wire 35 is set to be in the ON state. is loosened, and as a result, the clutch (not shown) is set to be in the ON state for planting.

Further, a pin 32c provided at one end of the first cam arm 32 on the traveling side is attached to a bullet Y (the bullet Y, the bullet X described above,
The relationship between the biasing forces of Z is X>Z, and X(Z+Y
It is set so that ) is interlocked and connected to the proximal end of the first hydraulic wire 36 via the first structure 19, and a pin 33c provided at one end of the first cam arm 33 on the side for planting The proximal ends of two hydraulic wires 37 are interlocked, and one end of the first cam arm 32.33 has a
A cam surface 32a corresponding to the lever pins 30c and 31c,
33a, and a cam surface 32d corresponding to a pin 42c of a third cam arm 42, which will be described later, is formed on the first cam arm 32 on the running side.

Also, at the other end of the same cam arm 32.33, a pin 32b,
33b is provided protrudingly.

Furthermore, second cam arms 38 and 39 are pivotally connected to the left and right side plates of the operation case 29 by pin shafts 38a and 39a so as to be adjacent to the first cam arms 32 and 33, respectively. These second cam arms 38 and 39 are both bullets 4
The second cam arm 38 on the running side is biased in the direction of the arrow as shown in FIG.
When the moving latch lever 30 is operated to the "off" position and the "fixed" position, the lever pin 30c abuts and locks the cam surfaces 38b and 38c, and the pin 42b of the third cam arm 42 to be described later. A corresponding cam surface 38d and a cam surface 38e are formed to which the pin 32b is locked when it extends beyond the corner portion 38f, as will be described later. In addition, the second cam arm 39 on the side is connected to the clutch lever 3.
The cam surfaces 39b, 39c, 39d, and the pin 33b, which the lever pin 31c abuts and locks when the lever pin 31c is operated to the "r-cut" position, the "fixed" position, and the "up" position, respectively, and the pin 33b move the corner portion 39f as will be described later. A cam surface 39e is formed that locks in the state where it is crossed. and each lever 30.
31 is operated and held in the respective corresponding positions by lever pins 30c and 31C pressing the cam surfaces and swinging the second cam arms 38 and 39 against the bullet 40 to cross over the mountain between the cam surfaces. It is achieved by becoming and moving. Incidentally, when both levers 30 and 31 are operated to the "R" position, they are held at that position by a fulcrum crossing action.

Furthermore, the first cam arm 32.33 is connected to the lever 30.31.
is operated to the "off" position, the lever pins 30c, 3
1c comes into contact with the cam surfaces 32a and 33a, and by operating the levers 1c toward the front side of the "cut" position, they are oscillated integrally with the lever pins 30c and 31c. Moreover, by this lever switching operation, the pins 32b and 33b of the first cam arm are positioned more forward than the corner portions 38f and 39f when the lever 30.31 is in the "off" position as described later. n and "Fixed"
If the lever is in the position, as described above, the corner portions 38f, 30f are moved in synchronization with the swinging of the second cam arm 38, 39 in the warping direction against the bullet 40 as the lever is operated to the position. The first cam arms 32 and 33 are held in a locked position by abutting against and engaging with the cam surfaces 38e and 39e. In addition, 41 is a cam arm 32, 33, 38.
This is a stopper protruding from the case body 29 in order to restrict the swinging of the case body 39 beyond a predetermined state.

When the latch lever 30 for running and the clutch lever 31 for planting are operated between the "R OFF" and "ON" positions, the lever pin 30 as shown in FIG.
0c and 31c are the cam surfaces 3 at the tip of the second cam arm 38.39
8b, 39b and then move to a loosened position, whereby both the first connecting link 18 and the second connecting link 17 side are in contact with the pins 18b, 17b.
is in an automatic control state where it is located approximately at the center of the flexible portions 18a and 17a. In this state, when the sensing float 9 moves up and down with respect to the machine body due to the unevenness of the tiller,
The actuating plate 16 is swung by the pin 12b that moves up and down, and when the aircraft sinks and the actuating plate 16 swings in the direction C in Fig. 5, the lift control valve 13 is switched to the side where the airframe is raised. When the actuating plate 16 swings in the counter-C direction, the elevation control valve 13 is switched to the lowering side of the aircraft, thereby creating an [automatic control] state in which the aircraft is automatically controlled to maintain a substantially constant attitude with respect to the circular surface. It looks like this.

On the other hand, for planting, when the clutch lever 31 is operated to the "fixed" position, the lever pin 31c comes into contact with the cam surface 39c of the second cam arm 39, and the clutch lever 31 is held in that position. However, at this time lever pin 3
1c, the first cam arm 33 also swings in the same direction, pulling the second hydraulic wire 37 by approximately the amount of play with the front end of the flexible portion 17a of the pin 17b, thereby causing the actuating plate 16 to move in the opposite direction of arrow C. It is designed to check the rotation, that is, the switching of the valve 13 to the lowering side of the fuselage. Therefore, when the latch lever 30 for running is in the "on" or "r off" position and the clutch lever 31 is operated in the "fixed" position for planting, only the raising operation of the machine body is automatically accomplished and the lowering operation is performed. is fixed (restricted) and enters the state of [raising automatic lowering fixed].

Furthermore, when the clutch lever 31 for planting is operated to the "up" position beyond the "fixed" position, the clutch lever 31 for planting is moved so that the lever pin 31c is moved to the second cam arm 39.
However, as the lever pin 31c moves at this time, the first cam arm 33 also swings in the same direction, and as a result, the second hydraulic wire 37 , the second connecting link 17 is moved backward, and the actuating plate 16 is forcibly rotated in the direction of arrow C, thereby switching the valve 13 to the body-raising side. When the clutch lever 31 is operated to the "up" position while the planting machine is in the "r-in" and "r-off" positions, the machine enters a "manual raise" state in which the machine body rises by manual lever operation.

On the other hand, turn the running latch lever 30 from "R cut" to "Fixed"
The latch lever 30 that moves when operated to the position,
The lever pin 30c contacts and locks the cam surface 38c of the second cam arm 38 and is held in this position, but the lever movement at this time causes the lever pin 30c to contact the cam surface 38c of the second cam arm 38.
2 in the direction of arrow E. As a result, the first hydraulic wire 36 is pulled so as to compress the bullet IaY, and the pin 18b comes into contact with the front end of the flexible portion 18a, causing the fifth actuation plate 16 to rotate in the direction of arrow C. In other words, valve 13
Switching to the aircraft raising side is now restricted. Therefore, when planting, if the clutch lever 31 is in the R-engaged or R-off position and the latch lever 30 is operated to the "fixed" position, only the lowering operation of the machine will be automatically accomplished. The side is fixed (restricted) in the "lowering automatic raising fixed" state, and both levers 30 and 31 are "fixed".
When operated to the position, the rotation of the first actuating plate 16 to either side is restrained, resulting in a "fixed" state in which the aircraft does not move up or down, and in this way, control switching by the levers 30 and 31 is possible. It is now possible to do so. In this manner, an operating means that can be operated to limit automatic switching of the elevation control valve 13 in this embodiment is constructed.

Furthermore, when planting, the clutch lever 31 is operated to the "up" position as described above, and the latch lever 30 is moved to the "up" position.
When operated in the "Fixed" position, planting is done using the clutch lever.
31 is adapted to be automatically displaced to the "fixed" position. In other words, when planting, when the clutch lever 31 is operated to the "up" position, the lever pin 31c is held in contact with the cam surface 39d of the second cam arm 39 as described above, and the first connecting link 33 is held by the pin. 33b is the cam surface 39 of the second cam arm
The pin tab on the first connecting link 17 side is in an unlocked state by being separated from e, and the pin tab on the first connecting link 17 side is in contact with the front end of the flexible portion 18a. Then, in this state, operate the latch lever 30 running from the "off" position to the "fixed" position to release the bullet Y.
Pull the first hydraulic wire 36 backward while compressing the
When the actuating plate 16 is forcibly rotated in the opposite direction of arrow C and the valve 13 is switched to the neutral state, the second hydraulic wire 37 is pulled forward while receiving a buffering effect from the bullet Y, and this forward pulling Planting is done by force using the side link arm 33.
presses the lever pin 31c in the opposite direction of the arrow E, thereby causing the lever pin 31c to swing the second cam arm 39 against the bullet 40 to cross over the mountain between the cam surfaces 39d and 39c, and push the lever pin 31c against the pin 33b. the position where the cam contacts the cam surface 39e,
In other words, the clutch lever 31 is automatically displaced for planting to the "fixed" position.

Further, the third cam arm 42 is swingably supported on the side plate of the operation case 29 via a support shaft 42a, and one end of the third cam arm 42 is provided with the above-mentioned speed change clutch lever. The upper end of the connecting rod 28 that moves in the direction of arrow B by the backward operation of 24 is connected by a pin 42b. A cam pin 42c related to a cam surface 32d formed on the one end 32a side and a cam pin 42d related to a cam surface 38d formed on the upper end of the second cam arm 38.
are formed respectively. and gear shift clutch lever
When the third cam arm 42 swings in the same direction due to the movement of the connecting rod 28 in the direction of arrow B due to the movement of the connecting rod 28 to the reverse position □, the first cam arm 32 moves against the cam surface 32d of the cam pin 42c.
The latch lever 30, which moves as described above, swings in the same manner as when the latch lever 30 is moved to the "fixed" position, thereby pulling the first hydraulic wire 36 and causing the valve 13 to move toward the body-raising side. While the switching is in a state of restraint, the second cam arm 38 receives the abutting and pressing operation by the cam pin 42d, resists the bullet @40, and similarly swings in the direction opposite to the arrow mark, thereby pushing the cam surface 38C of the lever pin 30c. The abutting and locking on the latch lever 30 is released, and the moving latch lever 30 is automatically displaced to the "fixed" position. Then, when the aircraft is raised, the clutch lever 3 is used for planting.
1 to the "raise" position and pull the second hydraulic wire 37, the first hydraulic wire 36 is expanded by compressing the bullet Y, and the actuating plate 16 rotates in the direction of arrow C, opening the elevation control valve. 13 switches to the fuselage raising side, and thus constitutes a check means for checking the switching of the valve to the fuselage raise side when the airplane moves backward, and this check means is limited only to the case where the lever is manually operated to raise the fuselage. The lever restraint has been released and the aircraft can now be raised. Furthermore, during this reverse operation, the pressing direction P of the cam pin 42d of the cam surface 38d is
The gear shift clutch lever 24 is set to move toward the connecting rod 28 side, which is aligned with the fulcrum of the support shaft 42a.
It is possible to position and hold the vehicle in the reverse position.

(Blank below) In the embodiment of the present invention configured as described above, when the latch lever 30 is used for running and the clutch lever 31 is operated to the "R" and "off" positions for planting, the elevation control is performed as described above. The valve 13 is in an automatically controlled state in which the operating plate 16 can swing in both directions. Therefore, by the vertical movement of the sensing float 9 that senses the unevenness of the tiller, the elevation control valve 13 is switched to the raising side or the lowering side of the machine body, and the automatic control of raising and lowering the machine body is achieved. The attitude of the machine relative to the rice field can be maintained substantially constant regardless of the unevenness of the tiller.

A latch lever 30 that moves when the aircraft rotates, moves backward, supplies seedlings, etc. in such an automatic control state of the aircraft attitude;
For planting, switching of the valves on the one-body-up side or the one-body-down side will be restricted by selecting the clutch lever 31 or operating it in the "fixed" position in conjunction with other lever operations. , The latch lever 30 that is currently running is an R-switch that does not restrict the switching of the valve to the lower side.
With the clutch lever 31 in the
Manually raise the aircraft by operating it to the "climb" position, and when the aircraft has risen to the desired height, operate the running latch lever 30 from the r-off position to the "fix" position.
During planting, the clutch lever 31 is forcibly pulled under the urging force of the ammunition Y.

As a result, the pin 33b of the first cam arm 33 is automatically displaced to the position where it comes into contact with the cam surface 39e of the second cam arm 39, that is, to the "fixed" position. As a result.

Both levers 30, 31 are almost simultaneously located in the "fixed" position, so that the lift control valve 13 is placed in the "fixed" state with limited switching to either side of the lift. Therefore, the aircraft will be set at the same elevated height. Therefore, when the aircraft has risen to the desired height, planting is done by operating the clutch lever 31 from the "raised" position to the "fixed" position and the latch lever 3
This eliminates the hassle of operating the 0 from the "off" position to the "fixed" position and setting it in the "body fixed" state, which significantly improves operability and prevents erroneous operations.

Incidentally, in order to make the explanation easier to understand, the following table shows the state in which the lifting and lowering of the aircraft body is controlled by the lever operation of the latch lever 30 that operates the valve switching mechanism adopted in this embodiment and the clutch lever 31 for planting. .

Table 1. It goes without saying that the present invention is not limited to the above-mentioned embodiments, but the point is that the raising side operating lever in the manual raising position is linked to the operation of the lowering side operating lever to the lowering limit position. It is sufficient if they are linked so that they are automatically displaced to the raising limit position.

These operating levers do not need to be used as a clutch lever as in the embodiment, but may be a dedicated operating lever, and the lowering-side operating lever can be further lowered manually. It may be something that has been made into In this case, when the lowering side operating lever is operated to the manual lowering position and the raising side operating lever is operated to the upper limit position, the lowering side operating lever is automatically displaced to the lowering limit position. You can also do that.

[Operations and Effects] In summary, the third invention is constructed as described above, so it is possible to limit the automatic switching of the elevation control valve when the aircraft is turning, moving backward, replenishing seedlings, etc. When the raising side operating lever is operated to the manual raising position to raise the aircraft to the desired height, and the lowering side operating lever is operated to the lowering limit position, the raising side operating lever in the manual raising position is linked to this. The machine is automatically displaced to the raising limit position, and the machine becomes fixed in a state where valve switching on either side of raising or lowering is restricted and the height of the machine can be maintained. Therefore, operability is significantly improved and work efficiency is improved. It is possible to achieve an improvement in

[Brief explanation of the drawing]

The drawings show an embodiment of the elevating and lowering control device for the working part of a paddy field working machine according to the present invention, and FIG. 1 is an overall side view of the walking rice transplanter with the bonnet removed, and FIG.
3 is a side view of the elevation control cylinder section, FIG. 4 is a plan view of the elevation control cylinder, FIG. 5 is a side view of the elevation control mechanism, and FIG. 6 is an explanatory diagram of the operation of the speed change clutch lever. Figure 7 is a connection diagram of the transmission clutch lever, Figure 8 J is a front view and cross section of the first cam arm on the traveling side, and Figure 9 J is a front view and cross section of the second cam arm. In Figure 1O, Figure J, the planting is on the side.
11J shows a front view and a sectional view of the cam arm, and FIG. 12J shows a front view and a sectional view of the third cam arm. is a front view of the operating handle,
Fig. 14 is a side view with a part of the front cut away, Fig. 15 is a plan sectional view of the main part of the front, and Fig. 16 is a bottom sectional view of the main part of the front.
Figure 17 is a rear view of the rice transplanter, Figure 18 is an explanatory diagram showing the movement of the cam arm when the moving latch lever is operated, and Figure 19 is the movement of the cam arm when switching to the reverse mode. Fig. 20 is an explanatory diagram showing the movement of the cam arm when the clutch lever is operated.
FIG. 1 is an explanatory view showing the operating positions of the latch lever for running and the clutch lever for planting. In the figure, 1 is a traveling aircraft, 5 is a traveling wheel, 9 is a sensing float, 13 is an elevation control valve, 15 is a JL control cylinder,
16 is an operating plate, 17.18 is a first and second connecting link, 20 is a driving handle, and 24 is a transmission clutch lever 13.
0 is the latch lever for running, 31 is the clutch lever for planting.
132 and 33 are first cam arms, 36.37 are first and second hydraulic wires, 38.39 are second cam arms, and 42 are third cam arms. J K Figure 10 K 11 Figure 3 e Figure 17 Figure 21 Figure 18 Figure 19

Claims (1)

[Claims] In a paddy field working machine in which vertical movement of the machine body is performed by automatic switching of a lifting control valve linked to the vertical movement of a sensing float, an operating tool means for restricting automatic switching of the lifting control valve, A raising-side operating lever that can be operated from an automatic control state to a raising-limiting position that limits the raising of the aircraft and a manual raising position that performs manual raising, and a lowering-side operating lever that limits the lowering of the aircraft from an automatic control state. In addition, when the lowering side operating lever is operated to the lowering limit position while the raising side operating lever is operated to the manual up position, the raising side operating lever is linked to the lowering side operating lever to the lowering limit position. 1. A lifting and lowering control device for a working part of a rice paddy working machine, characterized in that the working part is interlocked and connected via a linking means so as to be displaced as follows.