JPH0414994Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to a lock structure for locking the forward rotation of the drive shaft that drives the drive wheels during lowering of a power pruning machine.

Conventional technology Conventionally, the tree trunk is raised by forcibly driving the driving wheels that are in contact with the outer periphery of the tree trunk and the driving wheels of the idler wheels, and during this time, a chainsaw that is erected above the machine body is rotated to raise the tree trunk. A power pruning machine is known that cuts branches that are present in the area.

By the way, in this type of pruning machine, the switching between ascending and descending is achieved by providing a forward/reverse switching mechanism in the drive system such as the drive shaft that drives the drive wheels, so that this can be switched manually or automatically. It is something that exists. In other words, a suitable switching lever or the like is provided to switch this, and at the time of starting etc., manually hold this lever and position it on the rising side, and the drive shaft rotates in the normal direction to ascend. , this is automatically switched (not only is the forward/reverse mechanism switched, but the switching lever is also automatically switched to the lowering side), and the drive shaft is reversed to descend.

Problems that the invention aims to solve: However, in this case, the aircraft rotates in the opposite direction to when it ascends, and the aircraft, including the chainsaw and transmission case, detaches from the tree trunk and descends on its own (the center of gravity moves away from the tree trunk). Due to this, the centrifugal force inevitably causes the aircraft to shake violently. In particular, if the convex parts of the pruned nodes or the trunk of the tree are bent, the shaking will be the strongest at that point, and the tree may sometimes fall off.

Means for Solving the Problems Therefore, this invention lifts the tree trunk by holding the tree trunk between a drive wheel and an idler wheel and transmitting engine power to the drive wheel via the drive shaft. ,
Further, in a power pruning machine that performs pruning by spirally rotating a chain saw raised upwards along the trunk of the tree, a locking body that is removable from a locking wheel that is firmly fitted to the drive shaft is provided. This locking body is connected to a switching lever for switching the vertical direction of the aircraft by an operating rope, and when this switching lever is positioned on the upward side, the locking body is released from the locking wheel and the switching lever is also switched. When the lever is positioned on the lowering side, the locking body engages with the ratchet wheel in a manner that prevents forward rotation, thereby solving the above-mentioned problem.

As a result, when descending, under normal conditions, the drive shaft descends by reversing the rotation, but if the wheel hits a convex part of a knot, or depending on the direction of the aircraft's shaking, A driving force may be generated from the outside toward the forward rotation side (reaction force) with respect to the drive shaft, and at least the forward rotation direction component of this force is locked by the action of the locking wheel and the locking body described above. that's all,
The shaking is suppressed.

Embodiment Hereinafter, an embodiment of this invention will be described with reference to the drawings, and FIGS. 1 and 2 are a front view and a plan view of a power pruning machine according to this invention.

First, the general structure of this type of power pruning machine will be explained with reference to Figs. 1 and 2. A machine frame frame 4 is composed of a two-stage horizontal frame 2 and a vertical frame 3 that vertically connects the horizontal frame 2. A driving wheel 5, an idler wheel 6, a chain saw 7, etc. are provided to this machine frame 4.

That is, the drive wheel 5 is pivotally supported at the upper and lower ends of two transmission tubes 8 fixed to the machine frame 4 and erected in the vertical direction, with a certain ascending lead angle, and the drive wheel 5 is 5 are arranged so as to be in sliding contact with the outer periphery of the tree trunk 1. Furthermore, in addition to connecting the engine 9 and the transmission case 10, this transmission case 10 and the transmission cylinder 8
The output of the engine 9 is also branched from the transmission case 10 to the transmission tube 8 and guided to the drive wheel 5. 11 to be guided by this).

Further, the chain saw 7 is erected from a predetermined location of the transmission case 10, which is approximately in front of the tree trunk 1, and the power of the engine 9 is supplied to the chain saw 7.
It is also arranged so that it can be driven (rotated).

On the other hand, regarding the idler wheel 6, a rotating arm 12 is pivotally attached to both ends of the horizontal frame 2 constituting the machine frame 4 with pins 13, etc.
Like the drive wheel 5 described above, it is supported from the tip of the drive wheel 2 with a constant upward lead angle. A spring 14 is placed between the rotating arm 12 and the horizontal frame 2, thereby pressing the idler wheel 6 against the tree trunk 1. .

With the above configuration, if the driving wheels 5 and the idle wheels 6 hold the tree trunk 1, and if the driving wheels 5 are driven, the aircraft will move around the tree trunk 1 according to the ascending lead angle etc. set on the driving wheels 5. Since it climbs in a spiral shape, when the chain saw 7 is rotated at this time, the branch 15 on the way is cut. In addition,
To switch the aircraft up and down, use mission case 10.
This is done by a predetermined switching operation of a switching lever 16 that switches the drive system within the drive system between forward and reverse directions, and the setting dial 17, which is a type of timer that controls the switching timing of the drive system, is used to set the travel distance.
(The switching lever 16 is configured to automatically switch when the drive system is switched.) Furthermore, since the chain saw 7 and the like connected to the transmission case 10 are configured to be rotatable around the transmission tube 8 described above, the inertia force generated by the spiral rotation when the machine body moves up and down When ascending, it approaches the tree trunk 1, but when descending, it moves away from it.

By the way, this invention is a power pruning machine as described above, which is constructed as follows.

That is, a locking wheel 19 is firmly fitted to a drive shaft 18 that drives a drive wheel 5 in the mission case 10 or the like, and a locking body 20 such as a pawl that engages and disengages from the locking wheel 19 is provided.

That is, the locking body 20 is made rotatable around the support shaft 21, and when it engages with the locking wheel 19, the locking wheel 19 can rotate in the reverse direction, but cannot rotate in the forward direction. Make it into a ratchet shape that makes it impossible.

Then, the locking body 20 is connected to the switching lever 16 with a suitable operating cable 22, and the switching lever 16
When placed on the rising side (position A in Figure 2),
When the operating cable 22 is pulled to disengage the locking wheel 19, and when the switching lever 16 is positioned on the lowering side (position B in FIG. 2), the operating cable 22 is loosened and the locking wheel 19 is disengaged. so as to engage the stop wheel 19 (this may be due to the elastic force of the spring 23, etc.)
I'll keep it that way. Note that in FIG. 2, C indicates the neutral position of the switching lever 16.

As described above, when the machine body rises and pruning is completed, the switching lever 16 switches to the lowering position (position B) (this is done by the automatic switching mechanism built into the setting dial 17). The stop body 20 engages with the stop wheel 19 and prevents its reverse rotation. Therefore, even if the wheels hit the convex part of the joint during descent, or even if the aircraft shakes around the drive shaft 18, at least the forward rotation component of the drive shaft 18 (when viewed from the aircraft side, the trunk The component of the moment that approaches 1) is locked.

Effects of the invention As described above, since this invention has the above-mentioned configuration and works, the following effects can be expected.

In other words, as mentioned above, when the aircraft descends,
Since the forward rotational component of the drive shaft 18 is locked, the drive shaft 18 is
Since the approaching direction component of the vibration of the machine body toward and away from the tree trunk 1 due to the reaction force of the rotational force acting on the drive shaft 18 through the drive shaft 18 and the centrifugal force accompanying the downward rotation is also regulated, the vibration of the machine body is reduced accordingly. The amplitude of will become smaller.

This not only prevents the wheels from coming off, but also reduces the force acting on the surface of the tree trunk 1 and reduces the degree of damage to the surface. In addition, if the wheels come off, the machine frame 4 etc. will be directly attached to the tree trunk 1.
Since it is obvious that the surface of the tree trunk 1 is damaged when the tree trunk 1 is hit, it is also obvious that the degree of damage to the surface of the tree trunk 1 is reduced by preventing the derailment.

Furthermore, since the machine descends silently, it gives a very sense of security to the viewer, and since no strain is placed on the rotating parts, it increases worker confidence in the machine and increases the machine's lifespan.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention,
1 and 2 are a front view and a plan view of a power pruning machine according to this invention. Code, 1...Tree trunk, 5...Drive wheel, 6...Idling wheel, 7...Chain saw, 9...Engine, 16...
...Switching lever, 18... Drive shaft, 19... Locking wheel, 20... Locking body, 22... Operating cable.

Claims (1)

[Scope of utility model registration request] The tree trunk 1 is held by the driving wheels 5 and the idler wheels 6, and the power of the engine 9 is transmitted to the driving wheels 5 through the drive shaft 18, thereby raising the tree trunk 1 and standing up above the body. In a power pruning machine for pruning by spirally rotating and raising a chain saw 7 along the tree trunk 1, a locking body 20 is provided that can be engaged and detached from a locking wheel 19 that is firmly fitted to the drive shaft 18. When this locking body 20 and the switching lever 16 for switching the vertical direction of the machine body are connected by the operating mechanism 22, and this switching lever 16 is positioned on the upward side, the locking body 20 is moved to the locking wheel 19. drive in a power pruning machine, characterized in that when the switching lever 16 is disengaged and the switching lever 16 is similarly positioned on the lowering side, the locking body 20 is interlocked to engage the locking wheel 19 in a manner that prevents forward rotation. Part lock structure.