JPS5824090B2 - tree climbing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tree climbing machine equipped with a chainsaw, and relates to a device that can adjust the torque transmitted to the lifting wheels and the chainsaw.

In a tree climbing machine that transmits the engine output to a chainsaw and lifting wheels to perform pruning work while raising and lowering a standing tree, for example, when the chainsaw cuts thin branches or soft wooden branches, what is the problem? There is no problem, but when cutting branches with large cutting resistance such as large-diameter branches or hard wooden branches, they cannot be cut easily, the cutting speed decreases, and the rising speed of the wheel also decreases, and eventually The engine will stop.

Therefore, the present invention aims to provide a tree climbing machine that avoids the above-mentioned drawbacks by incorporating a special transmission torque adjustment device into the engine torque transmission path to the lifting wheels and the chainsaw. This is the purpose.

Hereinafter, the present invention will be explained in detail along with the drawings.

FIG. 1 is a plan view of the tree climbing machine 2 set on a standing tree.
The output of the engine 4 is transmitted to the chain saw 6 via the belt 5, and is also transmitted to the reducer 8 via the belt 7, and the output of the reducer 8 is further transmitted via the transmission torque adjustment section 9. The signal is transmitted to gear 10 and gear 11.

The gears 10 and 11 are swingable, and when the gear 11 meshes with the gear 12, it transmits forward rotation (in the climbing direction of the tree climbing machine) to the lifting wheels 13, and when it meshes with the gear 14, it transmits the positive rotation to the lifting wheels 13. Reverse rotation (in the climbing direction of the tree climbing machine) is transmitted to the wheels 13.

The rotating parts on the chassis 3, including the chain 6 and the engine 4, are moved by the output of the engine 4 to the rail 15.
Rotate around standing tree 1 while rotating the chain saw.
6 allows pruning work to be performed.

Note that the torque transmission mechanism to the lifting wheels 13 and the rotating mechanism of the rotating portion are not directly related to the present invention, so detailed explanations thereof will be omitted.

FIG. 2 shows a side view of the transmission torque adjustment section 9, in which the torque of the reducer 8 is transmitted to a small diameter pulley 16, and further transmitted to a large diameter pulley 18 by a belt 17.
The large diameter pulley 18 is also adapted to be transmitted to the lifting wheel 13.

A roller 21 pivotally attached to a connecting rod 20 pivoted to a washer 19 is in contact with the tension side of the belt 17.
This row 221 is urged inward by a spring 22, and the strength of the elastic force of this spring 220 can be adjusted by rotating a nut 23.

Further, by the output of the large pulley 18, the rotating part on which the engine 4 and chain saw 6 are mounted rotates around the tree 1 while rotating on the rail 15.

Next, the operation of this device will be explained in accordance with the above embodiment.

When the gear 11 is engaged with the gear 12 and the engine 4 is started, the chain saw 6 starts driving via the belt 5, and the belt 7, reducer 8, transmission torque adjustment section 9, gear 10, gear 11, gear Positive rotation is transmitted to the wheels 13 via the wheel 12, and the tree climbing machine 2 starts climbing up the tree.
The rotating part rotates on the rail 15 by the output of the large pulley 18, and the chain saw 6 cuts the tree branch.

Since the chainsaw 6 is mounted on the rotating part, the tree branch is cut at a speed equal to the rotating speed of the rotating part.

Note that the torque transmission means to the lifting wheels and the rotation means on the rail of the rotation portion are not directly related to the present invention as described above, and therefore their explanation will be omitted.

Now, when the tree branch to be cut by the chain saw 6 is thin or the wood is soft, the chain saw 6 cuts the tree branch while rotating easily, and the lifting wheels 13 also rotate smoothly in the upward direction. , If the tree branch is large in diameter or the wood is hard, use a chainsaw 6.
cannot easily cut tree branches, a large load is applied to the large pulley 18, the rotational speed of the rotating part is reduced, and the tree climbing machine 2 cannot be smoothly raised by the rotation of the wheels 13. As a result, the rotational speed of the wheels 130 decreases.

In this way, when a large load is applied to the large pulley 18 and the rotational speed of the large pulley 18 decreases, the small pulley 16 is still being driven and rotated by the torque transmitted from the engine 4. The tension side of the belt 17 is tensioned and strongly tensioned against the spring 22 as shown by the chain line in FIG. 2 (see the solid arrow).

Further, on the contrary, the relaxed side of the belt 17 is also relaxed as shown by the chain line.

When the belt 17 deforms in this way, the small pulley 16 starts to slip, and the torque transmitted to the large pulley 18 becomes correspondingly smaller.

Therefore, the rotational speed of the lifting wheels 13 driven by the dog pulley 18 and the rotating parts is reduced accordingly, and the tree climbing machine slowly cuts the tree branches while slowly climbing the tree. Become.

That is, according to the present device, when the chain saw 6 comes into contact with a tree branch that has a large cutting resistance, 1. When a large load is applied to the large pulley 18, which is the drive source, the belt 17 is deformed as described above to cause the small pulley 16 to slip, reducing the rotational speed of the rotating parts and wheels 13, and The tree branches are slowly cut while climbing the tree 1, thereby reducing the load applied to the large pulley 18 and making it easier to rotate the large pulley 18. This makes it possible to prevent engine stalling due to excessive load being applied to the engine 4.

The feature of this device is that it can be used in situations where a cut tree branch or the like is caught between the gears that make up the torque transmission mechanism, or when a tree branch is caught between the surface of a standing tree and the wheel 130. If it is, it will be more clearly understood.

That is, the rotating part and the wheels 13 are connected to each other through various gears.
Torque is transmitted from the dog pulley 18, but suppose that a tree branch or the like is caught between the two gears, making the gears unable to rotate.

In such a case, assuming this device is not installed,
The engine torque is transmitted to the non-rotatable gears, which puts an extremely excessive load on the engine, which not only causes the engine to stall, but in the worst case scenario, it also damages the torque transmission mechanism such as the gears. The excessive load applied may eventually destroy the torque transmission mechanism.

A similar situation will occur if a tree branch or the like gets caught between the wheel and the surface of a standing tree, making the wheel unable to rotate.

However, if this device is installed in the torque transmission path, when an excessive load is applied, the small pulley 16 will slip and idle, so the engine will not be overloaded and stall, and the torque will be reduced. This prevents the gears that make up the transmission path from being damaged by excessive load.

Now, when the belt 17 deforms as shown by the chain line, the tension side of the belt 17 is pulled inward (in the direction of the dotted arrow) by the action of the spring 220 via the roller 21, causing the small pulley 16 to become excessively Slippage is prevented, and the torque of the small pulley 16 is appropriately transmitted to the large pulley 18, allowing the tree branch to be cut at a reasonable speed.

In this way, when the cutting of the tree branch with high cutting resistance is completed, the load on the dog pulley 18 is reduced, the rotation speed returns to the original speed, and the belt 17 also returns to the solid line position.
The rotating parts and wheels 13 return to their normal rotational speeds again.

As explained above, according to the present invention, the chain saw comes into contact with branches with high cutting resistance, such as large-diameter branches and hard wooden branches, and a severe load is applied to the chainsaw, which increases the rotational speed of the lifting wheels and rotating parts. When the torque decreases, the belt is deformed and the transmitted torque is automatically adjusted, so the engine never stalls (and tree climbing and pruning work is always carried out smoothly). It is.

[Brief explanation of the drawing]

The figures show the implementation of the present invention, with FIG. 1 being a plan view of a tree climbing machine, and FIG. 2 being a side view of a transmission torque adjusting device. 2... Tree climbing machine, 4... Engine, 6... Chain, 8... Reduction gear, 9... Transmission torque adjustment device, 1
3...Wheel, 21...Roller.

Claims (1)

[Claims] 1 A driving pulley 16 and a driven pulley 18 are connected to the torque transmission path from the engine 4 to the lifting wheels 13 and the chain 6.
, and both goo') 16.18, and the tension side of the belt 17 is in elastic contact with a roller 21 which is urged by a spring 22.
The Shishida tree climbing machine is provided with a transmission torque adjusting device 9 in which a resilient force adjusting member 23 is provided.