JPH0335084Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an automatic transmission device for a pruning machine that can ascend at high speed at the beginning of the ascent and at a low speed from the middle of the ascent.

(b) Prior Art Conventionally, tree branches have few branches near the base of the trunk, and the number of branches gradually increases from the middle of the trunk to the tip.
The speed during the ascent could only be set constant.

(c) Problems to be solved by the invention Therefore, with conventional pruning machines, in order to be suitable for pruning work, the lifting speed must be set at a low speed, and the machine does not reach the height of the branch. The slow rise until reaching this point was a waste of working time and significantly reduced work efficiency.

(d) Means for solving the problem In the present invention, the drive wheels are configured to be linked to the engine through a transmission shaft having a high-speed gear and a low-speed gear connected to each other so as to be able to switch between high and low speeds. A cam for switching from high-speed gear to low-speed gear is directly connected to the speed change position setting dial, and the cam is configured so that it can rotate in conjunction with the speed change shaft via the cam interlocking shaft. , depending on the setting of the gear shift position setting dial.
When the drive wheels drive a certain distance and the machine reaches a predetermined height of the trunk, the machine is configured to automatically switch from high-speed gear to low-speed gear via a cam, causing the machine to rise. It is an object of the present invention to provide an automatic transmission device for a pruning machine that can perform the pruning at high speed up to near the height of the branch, and can significantly improve work efficiency.

(E) Effect According to the present invention, the cam is set to a predetermined state by setting the gear shift position setting dial, and the drive wheels are interlocked via the high speed gear of the gear shift shaft during the initial stage of ascent, so that the machine can be operated at high speed. At the same time, the cam is rotated from the speed change shaft via the cam interlocking shaft, and the drive wheel is driven a certain distance according to the cam setting by the dial, and the machine moves to the specified height of the trunk. When this point is reached, a cam automatically switches from high gear to low gear, and from then on the machine ascends at a low speed. Therefore, when setting the gear shift position setting dial, this machine
If the gear is adjusted so that it can be switched from a high speed gear to a low speed gear at a position slightly in front of the height of the trunk where branches are growing, it is possible to secure high speed climbing at a low position where pruning is not performed, and also to prevent the growth of branches. It is possible to ascend at low speeds at high positions.

(F) Effect The present invention provides a pruning machine that is equipped with a drive wheel and a chain saw, and is configured to cut branches with the chain saw while spirally climbing the trunk by rotating the drive wheel. The engine is configured to link the drive wheels to enable high-speed and low-speed switching via a transmission shaft with a high-speed gear and a low-speed gear connected, and a rotatable speed change position setting dial is equipped with a rotatable speed change position setting dial that allows switching from high-speed gear to low-speed gear. A cam for performing the switching operation is directly connected, and the cam is configured so that it can be rotated in conjunction with the gear shift shaft via the cam interlocking shaft. , a pruning machine configured to automatically switch from high speed gear to low speed gear via a cam when the drive wheels drive a certain distance and the machine reaches a predetermined height of the trunk. Because it is an automatic transmission device, it is possible to raise at a high speed at a low position where pruning work is not performed, which can significantly improve work efficiency, and it is also possible to raise at a low speed at a high position where pruning work is performed. This has the effect that the pruning work can be carried out without any hindrance.

In addition, in the present invention, a cam for switching from high-speed gear to low-speed gear is directly connected to the rotatable speed change position setting dial.
The mounting structure of the cam is simple, so
The entire structure of the automatic transmission device in the pruning machine can be made compact.

(G) Example The example of the present invention will be explained in detail based on the drawings.
A indicates a pruning machine, and this pruning machine A has drive wheels 2 disposed on the left and right at the top and bottom of the main frame 1, and caster-type rolling wheels 4 arranged in three horizontal rows on the top and bottom of the auxiliary frame 3. Further, both frames 1 and 3 are opposed to each other via a slidable connecting rod 5 so as to be able to approach each other freely, and both frames 1 and 3 are biased via a tension spring 6 so as to be able to approach each other freely. With the same urging force, the driving wheel 2 and the rolling wheel 4
By compressing the trunk B between the two, the machine can be mounted and supported on the trunk B. In addition, an engine 7 is attached to the back of the main body frame 1, and the power of the engine 7 is transmitted to the driving wheels 2, and while the trunk B is ascending in a spiral manner, a chain saw 8 disposed at the upper end of the main body frame 1 is used to move the trunk B upward. Branch b of B is cut to perform pruning work.

Here, the interlocking structure of the drive wheels 2 will be explained as follows.

That is, the output shaft 9 of the engine 7 is interlocked with the transmission shaft 11 via the worm gear 0.
A high speed gear 12 and a low speed gear 13 are freely rotatably connected to each other, and a dog clutch 14 is spline-fitted between both gears 12 and 13.
Either of the gears 12, 13 is configured to be interlocked and connected to the speed change shaft 11 in a freely switchable manner. Also,
A high-speed interlocking gear 1 meshes with both gears 12 and 13, respectively, on an interlocking shaft 15 arranged in parallel with the speed change shaft 11.
6. A low-speed interlocking gear 17 is installed in series, and sprockets 18, 18 are connected to the upper end of the interlocking shaft 15, and a sprocket 18 and the drive wheel 2 are connected to the lower end of the interlocking shaft 15. 19 so that they can be driven in conjunction with each other.

The driving wheels 2 are configured to be driven at high speed from the start of the ascent to the mid-ascent position, and from the mid-ascent position, to be switched to low speed and to be able to stop after ascending to a predetermined position, Its structure is as follows.

That is, a climbing distance setting dial 20 and a speed change position setting dial 21 are arranged on the main body frame 1, and the former dial 20 is connected to the dial shaft 22.
A climbing distance setting cam 23 is connected to the dial shaft 22, a dial shaft 33 is connected to the latter dial 21, and a speed change position setting cam 24 is connected to the same shaft 33.

The cam 23 forms a substantially circular cam surface 26 having a partially recessed portion 25 on the circumferential side.
6, roller arm 27 for connecting the engine power supply
The tip of the roller arm 27 is pressed into contact with the concave portion 25, and when the tip of the roller arm 27 is inserted into the concave portion 25, the power to the engine 7 is cut off and the engine 7 cannot operate. The configuration is such that the engine 7 can be operated in a connected state.

Further, the cam 24 forms a substantially circular cam surface 29 with a partially recessed portion 28 on the circumferential side, and the tip of a roller arm 30 for speed change is pressed into contact with the cam surface 29 via a biasing spring 31. The dog clutch 14 is located at the base end of the roller arm 30.
A fork 32 is installed in series for activating the
When the roller arm 30 is fitted into the recessed portion 28, the dog clutch 14 engages with the low speed gear 13,
The structure is such that the dock gear 13 can engage with the high speed gear 12 when it comes off the recessed portion 28.

As described above, changing the speed of the drive wheels 2 and
The drive is stopped by operating the cams 23 and 24, respectively, and the operations of the cams 23 and 24 are controlled as follows.

That is, if the dial 20 is turned clockwise by a predetermined angle from the state in which the tip of the roller arm 27 is fitted into the concave portion 25, the tip of the roller arm 27 is inserted into the concave portion 2.
5, the engine 7 becomes operational, and if the dial 20 is turned clockwise by a predetermined angle, the tip of the roller arm 27 comes off the recessed part 25, and the dog clutch 14 can engage the low speed gear 13. It is. Further, the low speed switching and the stopping of the upward drive of the drive wheels 2 are performed through the operation of the cams 23 and 24, and the operation of the cams 23 and 24 is realized by the following mechanism.

That is, the partially notched gears 34 and 35 are connected to the dials 22 and 33, respectively, and the cam interlocking gear 3 meshes with the partially notched gears 34 and 35, respectively, on a cam interlocking shaft 36 that is interlocked from the interlocking shaft 15.
7 and 38 are connected to each other in a parallel state, and both interlocking gears 37 and 38 are interposed with an engagement plate 39 that engages with both gears 37 and 38 only in the clockwise direction, and a spring 40 When the dials 20 and 21 are rotated clockwise by the rocking ball 41 and the pawl engagement groove 42, which are energized by the cam gears 37 and 38, , both the interlocking gears 37 and 38 rotate separately and independently, and when the cam interlocking gears 37 and 38 are rotated counterclockwise by the cam interlocking shaft 36 and the cams 23 and 24 return, the cam interlocking gears 37 and 38 are constructed so that they can rotate integrally with each other.

In addition, each notch 3 of the partially notched gears 34 and 35
4', 35' are formed so as to face each cam interlocking gear 37, 38 when the tip of each roller arm 27, 30 is fitted into each recessed part 25, 28.
This prevents the cams 23 and 24 from returning excessively, and the tips of the roller arms 27 and 30 are once attached to the concave portions 25 and 28.
When inserted, it will not come off accidentally from the recessed parts 25, 28.

That is, depending on the setting of the gear shift position setting dial 21, the drive wheels 2 are driven a certain distance and the machine is shifted to the trunk B.
When the gear reaches a predetermined height, the switching operation from the high speed gear 12 to the low speed gear 13 is automatically performed via the cam 24.

Note that the present invention is not limited to the above embodiment, and the driven shaft 4 may be a driving shaft.

The embodiment of the present invention is constructed as described above, and when performing pruning work, when the machine is attached to the trunk B and the dial 20 is rotated clockwise by a predetermined angle, the cam 23 With this rotation, the tip of the roller arm 27 comes off from the concave portion 25, and the engine 7 can be started. Also, when the dial 21 is rotated clockwise by a predetermined angle, the tip of the roller arm 30 comes off with the rotation of the cam 24. When the fork 32 is moved against the biasing force of the biasing spring 31 and the dog clutch 14 is engaged with the high-speed gear 12 to start the engine 7, the engine 7 is started. The machine ascends at high speed, and as the drive wheel 2 rotates, the cam interlocking gears 36 and 37 of the cam interlocking shaft 36 rotate counterclockwise, causing the cams 23 and 24 to return counterclockwise. Then, the tip of the roller arm 30 fits into the recessed part 28 and connects the dock clutch 1 via the fork 32.
4 engages the low speed gear 13, and the machine ascends at low speed.

Further, if the tip of the roller arm 27 subsequently fits into the concave portion 25, the operation of the engine 7 is stopped.
This will stop the machine from rising.

Therefore, by turning the dials 20 and 21 by predetermined angles, it is possible to ascend efficiently and at high speed in the initial stage of the climb where there are no branches b, and to ascend at a low speed from the middle part where there are branches b, thereby achieving sufficient pruning. The pruning work can be carried out and the pruning work can be set to stop at a predetermined height, thereby significantly improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an explanatory diagram of the interlocking mechanism, Fig. 4 is a plan view of the main parts, and Fig. 5 is a front view of the main parts. It is. A...branching machine, B...trunk, b...branch, 2...
Drive wheel, 7...Engine, 8...Chain saw, 1
1...Shift shaft, 12...High speed gear, 13...Low speed gear, 21...Shift change position setting dial, 24
...Transmission switching position setting cam, 36...Cam interlocking shaft.

Claims (1)

[Scope of utility model registration request] This pruning machine is equipped with a drive wheel 2 and a chain saw 8, and is configured so that the chain saw 8 cuts the branch B while spirally turning and climbing the trunk B by the rotational drive of the drive wheel 2. 12 and a low speed gear 13 are connected to the drive wheel 2 from the engine 7 so as to be able to switch between high speed and low speed. A cam 24 is directly connected to perform the switching operation from to the low speed gear 13, and the cam 24 is configured to be rotationally interlocked from the shift shaft 11 via the cam interlocking shaft 36. According to the setting of the switching position setting dial 21, when the drive wheel 2 is driven a certain distance and the machine reaches a predetermined height of the trunk B, the cam 2
4. An automatic transmission device for a pruning machine configured to automatically switch from a high speed gear 12 to a low speed gear 13 via a pruning machine.