JPH068654Y2 - Lever device for agricultural work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lever device in an agricultural working machine such as a rice transplanter or a direct seeder.

2. Description of the Related Art Conventionally, in a passenger rice transplanter, a single operating lever controls a planting clutch and a hydraulic pressure switching valve, and the planting section automatically rises in conjunction with depression of one of the left and right steering pedals. There is provided a device equipped with a so-called automatic lift device in which planting is stopped.

As a positioning member for such an operation lever, it is also considered to employ a so-called ball notch type member composed of a steel ball and a hole into which the steel ball is fitted, as in the case of a shift lever or the like.

However, in the case where the planting clutch and the hydraulic pressure switching valve are controlled by one operation lever as described above, a simple ball notch type member is used as the positioning member for the operation lever. Then, inconvenience occurs. That is, when operating the operating lever manually, for example, when operating from the hydraulic "neutral" position to the planting clutch entry side, resistance is applied to the operating lever at the intermediate hydraulic "down / auto" position (the operating force becomes heavy. ) Is preferable not only to prevent erroneous operation but also from the operator's sense of operation, but when the automatic lift is activated, the operating lever moves from the hydraulic “automatic” position to “raise”.
On the other hand, when automatically returning to the position, the ball notch type positioning member, on the contrary, interferes with the smooth return action of the operating lever, which impairs the reliability of the autolifting operation.

In order to solve the problems, the present invention forms the lever guide groove of the operation lever in a substantially straight line shape, and along the lever guide groove, the hydraulic pressure "up" position and "neutral" in the disengaged state of the planting clutch. Position, "Lower
A ball notch type positioning member is provided on the base end side of the operating lever which is sequentially shifted to the "automatic" position and the hydraulic pressure "automatic" position when the planting clutch is engaged. The position of the ball is such that the degree of insertion of the balls increases in sequence from the position “down / automatic”, and the end of the hole is hydraulic “down / automatic”.
By setting the position, the above problem is solved.

Action During planting work, when turning the steering pedal on either the left or right when performing a turn, the automatic lift device operates and the operating lever moves from the hydraulic "automatic" position to the "up" position when the planting clutch is engaged. After that, the planting part moves up automatically and the planting clutch is disengaged and planting stops. At the time of this autolifting operation, the operating force is slightly heavy due to the spring pressure that springs the ball of the positioning member at the initial stage of stepping on the steering pedal, but the planted clutch is disengaged and the hydraulic pressure is set to the "automatic" position. Since the ball fits into the receiving hole, the ball becomes lighter from that portion, and the operating lever moves to the hydraulic "up" position at once. Further, when the operation lever is manually operated in the opposite direction to the above, it is light at first, and becomes heavy when moving from the hydraulic pressure “down” position to the “automatic” position with the planting clutch.

The first embodiment is a cam plate rotatably supported by a frame 2 fixed to the body of a passenger rice transplanter via a rotation fulcrum shaft 3.
An outer cam 1a for controlling the planted clutch and a groove cam 1b for controlling the hydraulic valve are formed respectively. Outer cam 1a, groove cam
In the present embodiment, the positional relationship and shape of 1b are mountain-shaped, as shown in FIG. 1, having valleys a and b on both sides on the lower side of the outer periphery of the cam plate with the rotation fulcrum shaft 3 of the cam plate 1 interposed therebetween. The outer cam 1a is located, and a grooved cam 1b having a substantially arcuate shape centered on the rotation fulcrum shaft 3 is located on the upper side. The outer cam 1a is formed in a circular arc surface centered on the rotation fulcrum shaft 3 and between the top c and the valley b.

Reference numeral 4 denotes an operation lever, the base end portion of which is connected to the cam plate 1 by a pin 5 so as to rotate integrally with the cam plate 1 about a rotation fulcrum shaft 3 of the cam plate 1. Cage, hydraulic "up" position A, "neutral" with the planting clutch disengaged from the rear of the machine (right side in Fig. 1) to the front (left side)
It is set to the position B, the "lowering / automatic" position C, and the hydraulic "automatic" position D with the planting clutch engaged.

G is a lever guide groove of the operation lever 4, and this lever guide groove G is formed in a substantially straight line shape.

Reference numeral 6 denotes a bracket that is coaxially supported by the rotation fulcrum shaft 3 of the cam plate 1, and a planted clutch arm 8 that pivotally supports a roller 7 at its rear end is rotatably mounted on the bracket 6 by a support shaft 9. The tip of the planting clutch 11
Is connected with. The planting clutch 11 is constantly urged by the ammunition 12 toward the clutch entrance side, and the roller 7 is constantly pressed toward the outer cam 1a.

Reference numeral 13 denotes a planting clutch lever integrally provided on the free end side of the bracket 6, and the planting clutch lever 13 is normally held at a clutch disengagement position by an appropriate holding mechanism (not shown). By slightly moving the clutch lever 13 in the inward direction, the bracket 6 is swung in the counterclockwise direction in FIG. 1 about the fulcrum shaft 3 by the lever action, whereby the roller 7 moves along the cam 1a. Then, the wire 10 is loosened, and the planted clutch 11 is switched on and off.

A hydraulic operation arm 14 has a rear end rotatably supported by the frame 2 via a support shaft 15 and a front end connected to a plate 17 via a rod 16. The roller 18 axially supported in the middle of the direction is the groove cam 1b of the cam plate 1.
It is fitted and held inside. Reference numeral 17a is a pivot shaft of the plate 17. The plate 17 is connected to a valve operating rod 20 via a pin 19 projecting from the plate 17, and the valve operating arm 20 ′ rotates when the rod 20 advances and retracts to control the hydraulic pressure switching valve P. It has become.

Reference numeral 21 is a ball notch type positioning member provided on the base end side of the operating lever 4, and a ball N is supported by a ball holder 21 'attached to the frame 2 via an ammunition S,
The ball receiving surface of the cam plate 1 is provided with a receiving hole 22 corresponding to the ball N.

By the way, the receiving hole 22 is "down" from the hydraulic "up" position A.
The degree of insertion of the ball N is gradually increased toward the “auto” position C. The end of the receiving hole 22 is set to the hydraulic pressure "down / automatic" position C.

Numeral 23 is a swing arm which is integrated with the cam plate 1. An automatic lift operation rod 24 is connected to the rear end portion, and an automatic return wire 25 is connected to the front end portion via a tension bullet 25a. The operation lever is automatically returned from the hydraulic pressure raising position A to the neutral position B by the pulling force of the hydraulic pressure (referred to as an automatic return device). Although not shown, the lower end side of the operating rod 24 is pivotally connected to a swing rod provided below the steering pedal, and when either the left or right steering pedal is depressed, the swing rod rotates downward. The operation rod 24 is pulled by the movement, and the cam plate 1 rotates about the rotation fulcrum shaft 3 in the clockwise direction in FIG. 1, whereby the operation lever 4 disengages the planted clutch / hydraulic “up” position A. After that, the planting section will automatically rise and the planting will stop.
A so-called auto lift device is configured.

In the above-mentioned structure, the operating lever 4 is now in the hydraulic "neutral" position B shown by the solid line in FIG. 1 (where the roller 7 is in pressure contact with the vicinity of the top c of the outer cam 1a and the planted clutch arm 8).
Is held in the clutch disengaged position) to hydraulic "raise"
When the cam plate 1 is tilted to the position A, the cam plate 1 rotates integrally with the operation lever 4 about the rotation fulcrum shaft 3, so that the roller 18 moves the groove cam.
The hydraulic operation arm 14 moves in the direction of pushing up with the support shaft 15 as a fulcrum along 1b, whereby the plate 17 rotates counterclockwise with the pivot shaft 17a being stopped, and the rod 20 is pushed forward to move the valve. In order to rotate the operation arm 20 'to move the hydraulic pressure switching valve P to the raising side, a hydraulic cylinder (not shown) extends and raises the planting portion.

On the other hand, the rotation of the cam plate 1 causes the roller 7 to relatively move from the position near the crest c of the outer cam 1a to the trough b. Therefore, the planted clutch arm 8 does not move and remains in the original clutch disengaged position. When the hydraulic cylinder is fully extended, the auto return wire 25 is pulled and
Since the pulling force of a increases, the swing arm 23 and the cam plate 1 and the operating lever 4 integrated with the swing arm 23 rotate in the opposite direction to the above, and the operating lever 4 is automatically set to the "neutral" position. Return to.

Next, when the operation lever 4 is tilted from the "neutral" position B to the hydraulic "down / automatic" position C, the roller 18 moves in the direction of pushing down the hydraulic operating arm 8 along the groove cam 1b, so that the hydraulic switching valve P lowers the hydraulic pressure. But the roller 7 is still on the top c of the outer cam 1a.
Since the planted clutch arm 8 does not move, the planted clutch 11 remains disengaged.

Further, when the operation lever 4 is tilted to the hydraulic "automatic" position D with the clutch engaged, the groove cam 1b does not act on the roller 18 (the hydraulic operation arm 14 does not move), and only the outer cam 1a changes and the roller changes. 7 is fitted in the valley portion a and the planted clutch arm 13 is rotated counterclockwise, so that the planted clutch 11 is engaged.

By the way, when the operation lever 4 is operated, the positioning member 21
The degree of fitting of the ball N into the receiving hole 22 provided in the cam plate 1 gradually increases between the hydraulic pressure “up” position A and the hydraulic pressure lowering position C, and the ball reaches the maximum at the lowering position C at the end of the receiving hole 22. It will be inserted. Therefore, the operating lever 4 is positioned and held in the hydraulic pressure “lower” position C substantially reliably. When the lever is operated from the "down" position C to the "automatic" position D with the planted clutch,
The ball N is pushed by the cam plate 1 from the maximum fitted state into the receiving hole 22 and is suddenly pushed into the ball holder 21 'against the bullet S. As a result, the operator's operation feeling is relatively light and smooth from the hydraulic pressure “up” to “down”, and there is an initial catch between the hydraulic pressure “down” and the “automatic” engagement of the planting clutch. The next feeling is relatively heavy.

In this way, during manual operation, the lever operation force is light due to hydraulic vertical movement operation, and it becomes heavy when the planting clutch is engaged,
It is possible to prevent the risk of accidentally accidentally entering the planting clutch 11 and causing an unexpected accident.In addition, when one of the steering pedals is depressed during the planting work, the automatic lift device operates. Then, the operation lever 4 automatically returns in the opposite direction, that is, from the hydraulic “automatic” position D with the planted claw touch to the hydraulic “up” direction, but in this case, it is slightly heavy at the initial stage of pedal depression, "Down" position C
Since it becomes lighter after passing through, the lever 4 returns to the "raised" position A at a stroke. At this time, since the guide groove G of the operation lever 4 is formed in a substantially straight line shape, the returning action of the lever 4 is performed extremely smoothly.

Effect of the Invention As described above, the present invention controls the planting clutch and the hydraulic pressure switching valve with one operating lever, and the planting section automatically rises and plantes in conjunction with the depression of the steering pedal. In an agricultural working machine equipped with an automatic lift device for stopping the operation, the lever guide groove of the operation lever is formed in a substantially straight line, and the hydraulic pressure in the disengaged state of the planting clutch is formed along the lever guide groove. "Up" position, "Neutral" position, "Down"
A ball notch type positioning member is provided on the base end side of the operating lever which is sequentially shifted to the "automatic" position and the hydraulic pressure "automatic" position when the planting clutch is engaged. The position of the ball is such that the degree of insertion of the balls increases in sequence from the position “down / automatic”, and the end of the hole is hydraulic “down / automatic”.
Since the lever is set to the position, the lever return from the pressureless “automatic” position to the “raised” position during the operation of the automatic lift device becomes extremely smooth, and the lever return operation during the manual operation can be easily performed. Also, when shifting from the hydraulic "neutral" position to the "automatic" position side, the degree of ball insertion is maximized at the hydraulic "down / automatic" position in the middle, so it can be stopped at that position almost reliably, and carelessly. It is possible to prevent the risk of accidents such as accidents caused by the planting clutch.

[Brief description of drawings]

1 is a side view showing the structure of the operating lever mounting portion, FIG. 2 is a side view of the cam plate when the operating lever is in the neutral position, and FIG. 3 is when the operating lever is in the hydraulic pressure lowering / clutch disengagement position. 4 is a side view of the cam plate, FIG. 4 is a sectional view of the positioning member, and FIG. 5 is a plan view of a lever guide groove of the operation lever. In the figure, 4 is an operation lever, 21 is a positioning member, 22 is a receiving hole, N
Is a ball and G is a lever guide groove.

Claims (1)

[Scope of utility model registration request] 1. A single operating lever controls a planting clutch and a hydraulic switching valve, and the planting section is automatically raised and the planting is stopped in conjunction with depression of a steering pedal. In an agricultural work machine equipped with an automatic lift device,
The lever guide groove of the operation lever is formed in a substantially straight line, and along the lever guide groove, the hydraulic pressure "up" position, "neutral" position, "down / automatic" position, and planting clutch A ball notch type positioning member is provided on the base end side of the operating lever that is sequentially shifted to the hydraulic "automatic" position in the on state, and the ball receiving surface of the positioning member is moved from the hydraulic "up" position to "lower / automatic". "The lever device of the agricultural work machine is characterized in that the receiving hole is configured so that the degree of ball insertion increases gradually toward the position, and the end of the receiving hole is set to the hydraulic" down / automatic "position. .