JPH036183Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a needle operating device for an engine in a pruning machine.

In conventional pruning machines, the needle installed in the carburetor of the engine mounted on the machine frame is directly connected to a manual lever etc. with a wire, and the manual lever is operated to move the needle up and down to determine the rotational speed of the engine. The rotational output of this engine is transmitted to the driving wheels of the driving wheels and idle wheels that are held in contact with the periphery of the tree trunk, and in addition to raising the aircraft spirally relative to the tree trunk, it is also installed in an upright position above the tree trunk. The information was also transmitted to the chain saw, which then cut off the branches on the way up.

Therefore, with this type of pruning machine, the wire wiring may change due to contact with cut branches while running, etc.
As a result, the vertical adjustment position of the needle that is directly pulled by this wire changes, and the engine rotational speed suddenly changes to high speed, causing wheel derailment or stalling, or changes to low speed, reducing work efficiency. There were some problems, such as a drop in performance.

Therefore, the present invention solves the above-mentioned drawbacks by having a configuration in which the vertical position of the needle can be determined via a rotary cam connected to a forward/reverse switching lever that can be operated to switch between a forward rotation position, a neutral position, and a reverse rotation position. This has been dealt with.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

The pruning machine implementing the present invention has a main frame 1 on which drive wheels 2 are attached at a predetermined ascending lead angle, and a winding frame 3 on which idle wheels 4 are attached so that they can be opened and closed at one end. A tension spring 5 is removably attached so as to pull the other ends of each vertically movable body toward each other, and the wheels 2 and 4 are configured to abut and hold the stem 6 around the stem 6. A transmission case 10 is attached to the main frame 1, and this case 10 has an engine 7 fixed thereon whose engine speed changes depending on the amount of vertical movement of a needle 9 provided in a carburetor 8. I am wearing 11.

The rotation of the engine 7 is transmitted through a power transmission system such as a gear having an output shaft 7a protruding into the case 10 and incorporating a forward/reverse switching mechanism 13 that can be switched between forward/reverse and neutral states by a forward/reverse switching clutch 14. In addition to being transmitted to the driving wheels 2 via the path 12, the speed is also appropriately decelerated within the case 10 and transmitted to the chain saw 11. On the other hand, a mechanical timer 15 that can set any height according to the desired height of pruning, which is measured by extracting power from the middle of the power transmission path 12 and rotating in relation to the rotation of the drive wheel 2, automatically controls the forward and reverse rotation. The switching lever 16 is rotated around the mounting shaft 17 to switch from the forward rotation F position to the reverse rotation R position, and the clutch 14 is moved to the fork 18.
The driving wheel 2 is switched from normal rotation to reverse rotation via
It is configured so that the drive can be switched from forward rotation to reverse rotation. Note that this switching lever 16 is in the forward rotation F position,
Manual operation is also possible in the neutral N position and the reverse R position, and in particular, in order to lock the switching lever 16 in the N position, the locking plate 20 in the retracted position is activated by the force of the spring 19.
This can be done by raising the switch lever toward the switching lever and locking it in the notch part of the switching lever locking plate 20. In conjunction with this, the clutch 14 enters the neutral state via the fork 18, and then the switching lever 16 is moved to this locking position. When you manually switch from position (N position) to F position,
This locking is released and the locking plate 20 is automatically retracted by the force of the spring 19.

By the way, in the engine needle operating device A according to the present invention, the upper end of the needle 9, which is biased upward by the spring 21, protrudes from the case 8a of the carburetor 8, and is rotated to a position near the upper end. A rotating cam 22 that is rotatable around a shaft 23 is provided, and a wire consisting of an outer and an inner wire is connected between a wire attachment body 25 that is rotatably fitted around a mounting pin 24 that is set upright at a proper position on the cam, and the switching lever 16. 26, and a compression spring 27 is interposed between the attachment body 25 and the outer attachment portion of the wire 26 in the vicinity, so that the cam 22 can rotate in conjunction with the switching lever 16.

Further, the cam 22 and the needle 9 are in elastic sliding contact with the circumferential surface of the cam 22 via a spring 28, and the upper hemispherical surface of the needle 9 is in elastic sliding contact via the spring 21 when viewed from the front. An L-shaped driven lever 29 is interposed, whereby the cam 22
The locus of elastic sliding contact with the needle 9 is transmitted to the needle 9, so that the vertical position of the needle 9 can be changed.

The shape of the cam 22 is such that the switching lever 16 is
The cam 22 is gradually and smoothly formed with concavities and convexities so that the top dead center of the elastic sliding contact of the cam 22 in elastic sliding contact with the driven lever 29 when in the N and R positions is at an appropriate distance from the center of the cam.
The vertical position of the needle 9 is determined corresponding to each of the F, N, and R positions of the switching lever 16 via the driven lever 29 that is in elastic sliding contact with the cam 22 formed in this manner. In this case, even with variations in the rotation angle of the cam 22 that rotates when the switching lever 16 is switched to each of the F, N, and R positions, the needle 9 for each of the F, N, and R positions is The effect on the vertical position of is extremely small. In this embodiment, taking into consideration the effect of its own weight and the fact that the chain saw 11 does not cut branches when descending, etc., the distance from the cam center to each of the above-mentioned top dead center positions is set to the maximum when the switching lever 16 is in the F position. The cam shape is shaped like a convex and concave wave so that when it is in the N position, it is at its minimum, and when it is in the R position, it is in the middle.The needle's up and down positions are the same as when the switching lever is in the F, R, and N positions. In this order, the rotational speed of the engine 7 decreases in sequence.

The cam 22 has a notch formed therein, which is convenient for improving safety and adjusting the assembly by restricting rotation by the stopper 31. Further, the device A may have a configuration in which a horizontal disk is attached to the upper end of the needle 9 and the upper surface of the horizontal disk is brought into elastic sliding contact with the circumferential surface of the cam, without intervening the driven lever 29.

When in use, the machine is attached to the trunk 6, the locking plate 20 is raised, the switching lever 16 is set to the N position, and the cam 22 and the driven lever 2, which operate in conjunction with this, are
9, lower the needle 9 downward and connect the engine 7.
After starting the machine and setting the desired pruning setting dial 15a of the mechanical timer 15 to the desired pruning height, when the switching lever 16 is switched to the F position,
The needle 9 moves upward via the cam 22 interlocked with this, increasing the engine speed, and
The clutch 14 is switched from neutral to forward rotation via the fork 18 that is also linked to this, and the rotational power of the engine is transmitted to the drive wheels 2 through the power transmission path 12 to drive the drive wheels 2 in the normal rotation, thereby causing the trunk 6 to rotate as desired. While spirally rising to the pruning setting height, the chain saw 11
This is also transmitted to the tree, which causes the branch that is on its way to rise to be cut off. When the desired pruning setting height is reached, the mechanical timer 15 is activated and the switching lever 1 is activated.
6 is automatically switched to the R position, the needle 9 is slightly lowered via the cam 22 that is linked to this, the engine speed is reduced by this amount, and the clutch 14 is switched to the reverse side via the fork 18 that is linked to this. As a result, the driving wheels 2 are switched to reverse rotation, and the aircraft body descends together with the action of its own weight.

As is clear from the above description, according to the present invention, the vertical position of the needle 9 is determined via the cam 22 connected to the switching lever 16 and the wire 26. During pruning work, even if the wire wiring changes due to a branch cut with the chain saw 11 touching the wire wiring, the top dead center of the cam is used, so the needle changes vertically due to this. The amount is extremely small, and the engine speed can be maintained at the set speed depending on the switching lever position. In addition, even with variations in the rotation angle of the cam 22 that rotates in conjunction with the switching operation of the switching lever to the F, N, and R positions, the amount of vertical change of the needle is extremely small, and the switching lever is always The upper and lower positions of the needle corresponding to the F, N, and R positions can be set via a cam, and an engine rotation speed suitable for each working condition can be obtained.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of a pruning machine implementing the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an explanatory diagram of a needle operating device. Code, 2...driving wheel, 4...idling wheel, 6...
...Trunk, 7...Engine, 9...Needle, 12...
...Power transmission path, 13...Forward/reverse switching mechanism, 15
... Mechanical timer, 16... Forward/reverse switching lever, 22... Rotating cam.

Claims (1)

[Scope of utility model registration request] Equipped with an appropriate number of drive wheels 2 and idle wheels 4 that can touch and hold the circumference of the tree trunk 6, automatic pruning is performed using a mechanical timer 15 etc. that can be set to any height according to the desired height of pruning. A power transmission path incorporating a forward/reverse switching mechanism 13 that can be switched automatically and manually in conjunction with the switching operation of a forward/reverse switching lever 16 that can be switched between a forward F position, a neutral N position, and a reverse R position. 12, the rotational power of the engine whose rotational speed of the engine 7 changes depending on the amount of vertical movement of the needle 9 is transmitted to the driving wheel 2.
In this pruning machine, which moves up and down with respect to the trunk 6 by forward and reverse driving, a rotary cam 22 is provided near the needle 9, and the cam 2
2 and the switching lever 16, and the cam 22 rotates in conjunction with the switching operation of the switching lever 16 to each of the F, N, and R positions.
A needle operation device for an engine in a pruning machine, characterized in that it is configured to be able to determine the upper and lower positions of the needle 9 corresponding to each position.