JPH0628537B2 - Wheel drive for pruner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for a pruning machine for pruning while spirally rotating and ascending a chain saw along a trunk without the machine body stopping in the middle of the trunk. The present invention relates to a wheel drive device for a pruning machine that can descend.

2. Description of the Related Art Conventionally, a traveling wheel composed of a drive wheel and an idler wheel holds a trunk and transmits the power of a prime mover to the drive wheel to move the trunk up and down. Pruning is carried out while spirally rotating along with, and when it reaches the set height, the timer automatically shifts the gearshift lever incorporated in the wheel drive system to neutral to disconnect the wheel from the prime mover, and the wheel is driven by its own weight. There is a pruning machine that reverses and descends.

In this type of pruning machine, since the machine body is simply lowered by its own weight, the descending coasting force cannot be obtained in the initial descent when the machine body switches from ascending to descending (especially driving wheels and idle wheels along the trunk). It becomes impossible to descend, and when the machine is descending, the machine stops in the middle of the trunk due to bumps, shape, smoothness of the trunk surface, etc. However, on the contrary, there are problems such that safe work cannot be performed because the force of force descends at an accelerated rate, and equipment is damaged because of a point of acceleration that causes a collision with the ground.

Problems to be Solved by the Present Invention Therefore, in order to solve the above-mentioned problems, the present invention enables smooth initial descent of the aircraft immediately after the aircraft switches from ascending to descending, and the aircraft stops in the middle of the trunk. It is another object of the present invention to provide a wheel drive device for a pruning machine that can lower the body at an appropriate speed without lowering at an excessively high speed.

Means for Solving the Problems A wheel driving device for a pruning machine according to the present invention prunes a tree by vertically moving a trunk by a wheel and rotating and raising a chain saw along the trunk in a spiral manner during ascending. In the pruning machine, the drive system is disconnected and the descent machine is lowered at the time of rising to a predetermined height, and a descending drive motor linked to the wheels and a battery for supplying power to the motor. , And the transmission lever interlocking with the disconnection of the power system inserts a switch that keeps the battery and motor energized only in the neutral position in the middle of the connection and consumes the electric power generated by the motor. The present invention is also characterized in that a load body is also formed.

When the pruning machine rises to the set height, it automatically displaces the speed change lever to the neutral position, disconnects the drive system, and makes the wheels rotatable. Therefore, the wheels try to start to rotate toward the descending side by receiving the weight of the airframe downward. At the same time, the switch interlocking with the disconnection operation of the drive system keeps the motor and the battery energized because the drive system is disconnected, and the motor is supplied with power from the battery and starts to rotate and also has wheels. Rotate. Conventionally,
Since it was configured to descend only by its own weight, the pruning machine had the disadvantage that it was the easiest to stop at the time when the traveling direction of the aircraft was switched, but in the present invention, in addition to its own weight, the wheels are forcibly Since it is driven to rotate, the aircraft can surely descend without stopping even if the shape of the trunk changes or the smoothness of the trunk surface changes. Also, as the amount of descent increases, the aircraft will try to increase the descent speed due to the influence of gravitational acceleration. Therefore, the number of rotations of the wheels gradually increases and the rotation of the motor also accelerates. An electromotive force proportional to the rotation speed is generated in the motor, and the load body consumes the electric power supplied from the motor in proportion to the applied voltage. That is, as the rotation of the wheels increases, the load on the motor increases, and the electric braking effect of the wheels increases accordingly.
In this way, the electric brake acts so as to keep the descending speed of the machine body at a constant value, and the pruning machine descends stably.

Further, in the present invention, the fact that the switch is operated in association with the operation of the gear shift lever enables the switch to be positioned outside the mission case, and also enables effective use of the existing gear shift lever. Become.

Examples Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

2 and 3 show a pruning machine embodying the present invention, 1 ...
Is a drive wheel to which power is transmitted from the prime mover 2 via the mission in the mission case 3, and holds the trunk 5 together with the opposing idler wheel 4 to move the machine body 6 up and down.

Reference numeral 7 denotes a chain saw that stands upright above the machine body 6, and is driven by transmitting power from the prime mover 2 together with the drive wheels 1 ..., The chain saw 7 shown in this embodiment extends along with the machine body 6 around the trunk 5. With this, the pruning is sequentially performed while rotating and rising.

Reference numeral 8 denotes a speed change lever for manually operating a speed change transmission mechanism provided in the middle of the drive system from the prime mover 2 to the drive wheels 1 ... If the raising amount of the machine body 6 is set by the pruning height setting dial 9, the machine body 6 is automatically switched to neutral when the machine body 6 reaches the set height, and the switching operation of the speed change transmission mechanism is performed. Also changes the speed change lever 8. Further, at the neutral position of the speed change transmission mechanism, that is, at the neutral position of the speed change lever 8, the prime mover 2 and the drive wheels 1 ...
・ And the interlocking connection is broken, and the drive wheels 1 ...

By the way, the wheel drive device for the pruning machine according to the present invention may be provided on the drive wheels 1 ... Or on the idler wheel 4, but in consideration of weight balance, installation space, workability, etc. Since it is better to mount it on the idler wheel 4 side, this embodiment shows one mounted on the idler wheel 4 side. As shown in FIG. 1, the wheel driving device of the pruning machine is provided with a circumferential rack 10 on the inner circumference of a rim 9 of an idler wheel 4, and a motor 11
The pinion 17 is fitted on the tip of the rotation shaft of the
Is engaged with the circumferential rack 10, and a battery 12 for supplying electric power to the motor 11 is provided. During the connection between the motor 11 and the battery 12, the speed change lever 8 is energized only at the neutral position. The switch 13 in the state is inserted. Furthermore ,. A load body 14 that can appropriately consume electric power when the motor 11 is rotationally driven by an external force to generate an electromotive force is incorporated in the connection. The load body 14 can be easily formed, for example, by installing the high potential side via a resistor such as a coil. In the figure, 15 is an idle wheel axle fixed to the machine body 6, and 16 is a diode.

The operation of the pruning machine of the present invention having the above configuration will be described.

After the machine body 6 is held by the trunk 5 and the prime mover 2 is started, the machine body rising distance is set by the pruning height setting dial 9 and the gear shift lever 8 is normally rotated from the neutral position to the drive wheels 1. Switch to. When the pruning machine reaches the set uplift distance, it automatically switches the speed change transmission mechanism to the neutral position and also moves the speed change lever 8 to the neutral position, and the switch 13 interlocking with the speed change lever 8 is energized. Motor 11
Causes the wheels to rotate to the descending side, and in addition, the weight of the pruning machine acts to lower the wheels. Therefore, the pruning machine surely descends without stopping in the middle of the trunk 5.

On the other hand, as the descent amount increases, the airframe 6 gradually tries to increase its speed due to the influence of gravitational acceleration. When the wheels rotate faster, the motor 11 acts as a generator, and the electromotive force increases in proportion to the rotation,
Moreover, the power consumed by the load 14 also increases in proportion.
As a result, the electric brakes act on the wheels in proportion to the descending speed, and the descending speed is stabilized below a predetermined speed.

EFFECTS OF THE INVENTION As described above, according to the present invention, the motor 11 drives the wheels 4 in the descending direction immediately after the pruning machine is switched from ascending to descending and at the time of initial descending when the descending coasting force is not applied to the machine body. By forcing the aircraft 6 to descend,
It is possible to reliably prevent the airframe 6 from stopping midway through the trunk 5 during the initial descent as in the past, and while the airframe 6 is descending, the motor 11 acts as an electric brake and is proportional to the descending speed. By generating the braking force described above, the machine body 6 is stably lowered at a predetermined speed or less, so that damage to the device can be prevented and it is also beneficial for safety.

Further, in a normal use state of the pruning machine according to the present invention, the electric power for driving the motor 11 is consumed only at the initial lowering time, and the battery consumption is extremely small.

Further, since the switch 13 is energized by the neutral operation of the gear shift lever 8 which is externally mounted and the wheels are driven in the reverse direction, the switch 13 and the like have a simple structure, but are compared to those in which the switch 13 and the like are installed in the mission case. The reverse rotation is reliable, and even if a trouble should occur, it is easy to inspect,
There are advantages such as adjustment and repair.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a wheel driving device for a pruning machine according to the present invention, and FIGS. 2 and 3 are a plan view and a front view showing a pruning machine embodying the present invention. Reference numeral 5 ... Trunk, 7 ... Chain saw, 11 ... Motor, 12
...... Battery, 13 ...... Switch, 14 ...... Load body.

Claims (1)

[Claims] 1. Pruning is performed by vertically moving a trunk up and down by a wheel, and while raising, a chain saw (7) is spirally swung up along the trunk (5) to prun, and at the time when it is lifted to a predetermined height. In a pruning machine in which a drive system is disconnected to descend, a descending drive motor (11) interlocked with the wheels and a battery (12) for supplying electric power to the motor (11) are mutually connected. The switch (13) for holding the battery (12) and the motor (11) in the energized state is inserted only in the neutral position by the speed change lever (8) interlocking with the disconnection operation of the drive system in the middle of the connection. In addition, a wheel driving device for a pruning machine, characterized in that a load body (14) for consuming electric power generated by the motor (11) is also formed.