JPH0524260Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an operating lever support structure for agricultural working machines such as rice transplanters and flooded direct sowing machines.

Conventional Technology Conventionally, in rice field work equipment such as rice transplanters, two operating levers, a hydraulic operating lever that controls a hydraulic valve and a work clutch operating lever that switches on and off a work clutch such as a planting clutch, are operated from the driver's seat. A lever is provided that is arranged on one side so that the closely related lever operations of vertical movement of a working part such as a planting part and switching on/off of a working clutch can be easily performed with one hand.

Problems to be Solved by the Invention However, because the hydraulic control and the on/off switching operation of the work clutch require different operating systems, the conventional system uses separate fulcrum shafts for each of the two operating levers. Many products are constructed separately with independent components, which not only makes the structure complicated and redundant, but in some cases, the components may interfere with each other, so it is difficult to place each lever in the optimal position. In some cases, it is not possible to install the aircraft, which poses problems such as sacrificing operability and restricting the aircraft layout.

Means for Solving the Problems Therefore, the present invention provides a cam integrally on the fulcrum shaft of the hydraulic operating lever, pivots a U-shaped bracket to the fixed side of the fuselage via the fulcrum shaft, and attaches the cam to the bracket. The fulcrum shaft of the work clutch actuating arm operated by the cam is rotatably supported, a plate is installed inside the bracket with a loose fit and supported by the two fulcrum shafts, and the plate is attached to the bracket via a compressor. The base end of the working clutch operating lever is fixed to the plate,
The above problems are solved by simultaneously controlling the hydraulic valve and the work clutch via the cam by operating the hydraulic control lever alone, and by configuring the work clutch so that only the work clutch can be switched on and off by operating the work clutch control lever. That is.

Operation The rotation of the cam by operating the hydraulic control lever operates both the hydraulic valve operating arm and the planting clutch operating arm, thereby simultaneously controlling the hydraulic pressure and switching on/off the work clutch. Furthermore, by operating the work clutch operating lever as necessary, the work clutch can be switched on and off independently of hydraulic pressure control.

Embodiment 1 is a hydraulic control lever for a riding rice transplanter, and a plate-shaped cam 3 is integrally fixed to a fulcrum shaft 2 of the lever.

Reference numeral 4 denotes a U-shaped frame fixed to the fuselage, and a U-shaped bracket 5 is inserted into the space below the U-shaped frame 4, and one longitudinal end of the bracket 5 supports the fulcrum shaft 2. It is rotatably supported by the U-shaped frame 4 via the U-shaped frame 4. 6 connects a wire 8 and a bullet 8a to a planting clutch 7 which is a working clutch.
The planting clutch actuating arm is connected via the
A lower roller 9 that comes into contact with the lower surface of the cam 3 is pivotally supported on the operating arm 6 . A fulcrum shaft 10 of the actuating arm 6 is rotatably inserted and supported at the other end of the bracket 5 parallel to the fulcrum shaft 2 of the hydraulic operating lever 1. Incidentally, the planting clutch 7 is always urged toward the clutch ON side by a bullet (not shown).

A plate 11 is built into the inside of the bracket 5 with one end supported loosely on the fulcrum shaft 2 and the other end loosely fitted on the fulcrum shaft 10. The plate 11 is resiliently biased against the inner wall surface of one side of the bracket 5 by the machine 11a, and the plate 11 is in close contact with the bracket 5 without wobbling. A planting clutch operating lever 12 is a working clutch operating lever, and its base end side is located below the fulcrum shaft 10 and is fixed to the plate 11. Reference numeral 13 denotes a hydraulically operated arm rotatably supported on the frame 4 via a fulcrum shaft 14. The arm 13 is connected to a plate 16, which will be described later, via a rod 15 at its rotating tip end.
The upper roller 1 is in contact with the upper surface of the cam 3.
7 is pivoted. 13a is hydraulically operated arm 1
This is the No. 3 energized bullet machine.

The hydraulic operating lever 1 is sequentially moved from the rear (right side in Figure 2) to the front (left side) of the aircraft, with the hydraulic pressure in the ``up'' position A, the ``neutral'' position B, the hydraulic pressure in the ``automatic lowering/clutch OFF'' position C, and the hydraulic pressure in the ``lower'' position A. It is set to "lower automatic/clutch ON" position D.

Normally, the planting clutch operation lever 12 is fitted into the engagement groove 12'a of the guide hole 12a, and the compression ammunition 11
The clutch is held in the OFF position in a stable state without any rattling due to the triggering action of a, and the planting clutch operation lever 12 is moved against the compression trigger 11a to engage the engagement groove 1.
By simply removing it from 2'a and moving it slightly in the ON direction (downward), the bracket 5 rotates counterclockwise around the fulcrum shaft 2, which causes the lower roller 9 to move along the cam 3 and remove the wire. 8 is loosened and the planting clutch 7 is turned on. 16 is a plate body, and 18 is its pivot shaft. The plate body 16 is connected to the hydraulic rod 2 via a pin 19 protruding from the plate body 16.
0, and as the rod 20 moves back and forth, the switching arm 20' is rotated to switch the hydraulic valve P. 21 is a ball notch attached to the frame 4, and the cam 3 is provided with a hole 22 corresponding to the ball notch 21. 2
Reference numeral 3 designates an arm integrated with the cam 3, with an auto-lift operating rod 24 connected to the rear end, and an auto-return wire 25 connected to the front end via a tensioning machine 25a. Due to the force, the operating lever 1 moves from the oil pressure raising position A to the neutral position B.
(so-called auto-return device). 26 is a connecting plate integrated with the hydraulic rod 20, the free end side of the connecting plate 26 is pivotally connected to one end of a link 27 with a pin 27a, and the other end side of the link 27 is connected via a pin 28 and a long hole 29. It is connected to a sensor rod 30. 31
is the pivot point of the link 27. 32 is a float adjustment lever, and 33 is its fulcrum pin. 34
35 is an upper link, 35 is a lower link, and 36 is a hydraulic cylinder for raising and lowering the planting section connected to the upper link 34, and is connected to the hydraulic valve P via a pipe not shown in the figure. A lift control device M for the planting section N is configured by the hydraulic cylinder 36 and the like. Above link 3
A roller d intersecting the locus of movement near the upper limit of the vertical movement stroke of 4 is rotatably provided on an arm f pivotally connected to the machine body via a support shaft e, and is attached to the tip of the wire 25. The wire 25 is pulled by upward movement of the upper link 34 via the screwed nut 25b.

37 is a float (center float) mounted below the planting part N so as to be movable up and down; 38 is a hydraulic pressure sensing lever; the lower end of the oil pressure sensing lever 38 is on the float 37 side, and the upper end is on the link holder 3 side.
9 through a fulcrum pin 40.
2, and the raising and lowering control of the planting part N is controlled by sensing vertical fluctuations based on changes in soil pressure from the rice field to the float 37 provided in the planting part N. The connected hydraulic pressure sensing lever 38, swing arm 41, etc., and the sensor rod 30 and switching arm 2 connected to the control device M side
This is done via an actuating mechanism S that is connected in a link-like manner at points such as 0'.

In the above configuration, during planting work, when the float 37 moves up and down due to unevenness of the field surface, the hydraulic pressure sensing lever 38 moves up and down, and this causes the swing arm 41 to rotate around the fulcrum pin 40. Since the sensor rod 30 moves back and forth, the link 2
7. The hydraulic rod 20 and the switching arm 20' of the hydraulic valve P move in sequence, and the elevation control device M is automatically controlled.

Next, a case where hydraulic pressure control is performed manually will be described. The operating lever 1 is now in the neutral position B shown by the solid line in FIG. )
When the cam 3 is moved from the fulcrum shaft 2 to the oil pressure raising position A,
Since the roller 17 rotates integrally with the operating lever 1 around , the roller 17 moves along the upper surface of the cam 3 in the direction of pushing up the hydraulic operating arm 13 using the support shaft 14 as a fulcrum, and as a result, the plate 16 is moved upward. The hydraulic cylinder 36 extends and rotates counterclockwise around the pivot shaft 18 to push the hydraulic rod 20 forward and move the switching arm 20' of the hydraulic valve P to the upward side.
to rise.

On the other hand, due to the rotation of the cam 3, the roller 9 moves relatively from a position near the lower apex c of the cam 3 to the upper right b, but the space between the apex c and the upper right b is formed into an arc surface centered on the fulcrum shaft 2. Therefore, the planting clutch operating arm 6 does not move and remains held at the clutch OFF position. When the hydraulic cylinder 36 is fully extended, the auto-return wire 25 is pulled through the upper link 34, roller d, and arm f, increasing the tensile force of the bullet 25a. The cam 3 and the hydraulic operating lever 1 rotate in the opposite direction to the above, and the hydraulic operating lever 1 is automatically returned to the neutral position B.

Next, when the operating lever 1 is moved from the neutral position B to the oil pressure lowering automatic/clutch OFF position C, the upper roller 17 moves in the direction of pushing down the hydraulic operating arm 13, so the hydraulic valve P is switched to the oil pressure lowering side, but the lower The roller 9 is still in pressure contact with the lower top c of the cam 3, so the planting clutch actuating arm 6 does not move, so the planting clutch 7 remains in the OFF state.

Furthermore, lower the hydraulic pressure on operating lever 1 to engage the automatic clutch.
When tilted to the ON position D, the cam 3 does not act on the upper roller 17 (hydraulic operating arm 13
does not move), but the lower roller 9 fits into the valley a,
Since the planting clutch operating arm 6 rotates counterclockwise, the planting clutch 7 is turned on.

In this way, both the hydraulic valve P and the planting clutch 7 are controlled simultaneously by operating one operating lever 1, but the planting clutch operating lever 12, which is normally held in the clutch OFF position, is required. If the bracket 5 is moved slightly in the ON direction according to By moving along the line, the wire 8 fixed to the tip of the planting clutch operating arm 6 is loosened, so the planting clutch 7 can be switched to the ON state without being affected by the hydraulic valve P in any way.

In this way, one end of the U-shaped bracket 5 is pivotally supported together with the cam 3 by the fulcrum shaft 2 of the hydraulic operating lever 1 to the frame 4 fixed to the body, and the planting clutch operated by the cam 3 is attached to the other end of the bracket 5. Since the fulcrum shaft 10 of the operating arm 6 is pivoted and the planting clutch operating lever 12 is held by these two fulcrum shafts 2 and 10, one cam can operate the hydraulic operating arm 13 and the planting clutch operating arm. 6 can be operated, and it has also become possible to operate the planting clutch operating lever 12 alone. In addition, the two operating levers 1 and 12 and each of these constituent members are supported on the fixed side of the machine through the simple-shaped bracket 5 without interfering with each other. can be extremely compact and placed at the desired optimal position. Furthermore, the planting clutch operating lever 12 is supported at two points by the U-shaped bracket 5 via the plate 11, and the plate 11, which is integrally fixed to the base end side of the planting clutch operating lever 12, is supported by the compressor 11a. Coupled with the fact that it is always resiliently biased toward the inner wall surface on one side of the bracket 5, the planting clutch operating lever 12 has an extremely stable support structure.

The present invention can be applied not only to rice transplanters but also to paddy field working machines such as flooded direct sowing machines. When the present invention is adopted in a flooded direct sowing machine, the planting clutch operating arm 6, the planting clutch 7, and the planting clutch operating lever 1
2 are a sowing clutch operating arm, a sowing clutch, and a sowing clutch operating lever, respectively.

Effects of the Invention As mentioned above, the present invention provides a cam integrally on the fulcrum shaft of the hydraulic operating lever, pivots a U-shaped bracket to the fixed side of the fuselage via the fulcrum shaft, and attaches the cam to the bracket. The fulcrum shaft of the work clutch actuating arm that is operated by is rotatably supported, and a plate is installed inside the bracket with a loose fit and supported by the two fulcrum shafts, and the plate is inserted into the bracket through a compressor. The base end of the work clutch operating lever is fixed to the plate, and the hydraulic valve and the work clutch are simultaneously controlled via the cam by single operation of the hydraulic operating lever. Since it is configured so that only the work clutch can be switched on and off by the operation of Although the two operating levers, the hydraulic operating lever and the work clutch operating lever, and their respective constituent members are supported on the fixed side of the fuselage through a U-shaped bracket without interfering with each other. As a result, the levers for both the hydraulic and work operation systems can be made extremely compact and arranged in the desired optimal position without sacrificing operability or restricting the machine layout. This has the advantage of being able to provide a stable support structure with two-point support without rattling.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the related structure of the hydraulic operating lever and the planting clutch operating lever, Figs. 2 and 3 are side views showing the operating mechanism of the work equipment elevation control device, and Fig. 4 is a sensor rod and rocker. FIG. 3 is a side view showing a connecting structure of movable arms. In the figure, 1 is a hydraulic operating lever, 2 is a fulcrum shaft, 3 is a cam, 5 is a bracket, 6 is a working clutch operating arm, 7 is a working clutch, 10 is a fulcrum shaft, 11 is a plate, 11a is a compressor, 12 is the work clutch operating lever, and P is the hydraulic valve.

Claims (1)

[Scope of utility model registration request] A cam is integrally provided on the fulcrum shaft of the hydraulic operating lever, a U-shaped bracket is pivoted to the fixed side of the machine via the fulcrum shaft, and the fulcrum shaft of the work clutch operating arm operated by the cam is attached to the bracket. The plate is supported rotatably and installed inside the bracket in a state in which it is loosely supported by the two fulcrum shafts, and the plate is elastically biased against the inner wall surface of the bracket via a compressor to operate the work clutch. The base end of the lever is fixed to the above plate, and by operating the hydraulic operating lever alone, the hydraulic valve and the work clutch can be controlled simultaneously via the cam, and only the work clutch can be switched on and off by operating the work clutch operating lever. An operating lever support structure for an agricultural working machine, characterized in that it is configured as follows.