JPS6349175Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a transmission device for a self-lifting pruning machine that can perform tree pruning work efficiently.

Place the driving wheel and idler wheel in contact with the tree from around it,
A self-lifting type that drives the drive wheels forward to the tree to a predetermined height, climbs it in a spiral pattern, cuts the branches in between using an equipped chain saw, then automatically reverses the drive wheels and descends in the same spiral pattern. Pruning machines are known.

However, this type of pruning machine can only switch forward and backward by reversing the drive wheels once it has risen to a predetermined height, and is designed to operate at a low speed when ascending in order to carry out pruning work.

However, since the branches to be pruned by such a pruning machine are usually from a height of several meters or more above the ground of the tree, the branches are climbed at high speed during that time, and then the desired pruning work is performed from above. If it is possible to automatically reduce the speed to a lower speed, the work time can be reduced accordingly.

Therefore, this invention aims to provide a transmission device for a self-elevating pruning machine that is capable of automatically switching between high and low speeds in addition to forward and backward switching.

Hereinafter, specific embodiments of this invention will be described based on the drawings.

Fig. 1 is a partially sectional front view of a self-lifting pruning machine equipped with a transmission according to this invention, and Fig. 2 is a schematic plan view of the same part. An engine 2, a transmission 3, etc. are fixed to the engine 2, and three driving wheels 4, which are driven by appropriate means for transmitting the engine power from the transmission 3, are mounted.
4' and 5 are connected to the transmission 3 facing diagonally upward so as to contact the periphery of the tree.

On the other side of this frame 1 are pins 1a, 1.
Floating frames 6 and 7 that are rotatable around b are connected,
The other end is biased toward the frame 1 side (wood side) by springs 8 and 9, and the idler wheels are mounted on the idler frames 6 and 7 in the same mounting position as the drive wheels 4, 4', and 5. 10... are installed.

Note that a part of the power of the engine is transmitted from a power take-off shaft 11 of the engine 2 or the transmission 3 to a chain saw 12 mounted in an upright manner.

By the way, the transmission according to this invention is installed in an appropriate transmission means in the transmission 3 that transmits the power of the engine 2 to the drive wheels 4, 4', and 5.

That is, within the transmission 3, engine power is first transferred from the power take-off shaft 11 to the chain transmission 13.
The speed is then decelerated by the worm mechanism 14 and transmitted to the high/low speed shift shaft 15, and the forward rotation high/low speed gear 18a of the forward/reverse switching shaft 17 is transmitted through the high/low speed switching transmission 16 spline-fitted on this shift shaft 15. ,18
transmitted to b.

That is, this high/low speed switching transmission 16 is
It is operated by a high/low speed shift fork 36 that is linked to the shift operation setting described later, and this fork 36
When operating downward in FIG. 1, one gear of the transmission 16 meshes with the forward rotation high speed gear 18a on the switching shaft 17, causing high speed forward rotation, and
When moving upward, it meshes with the forward rotation low speed gear 18b, and rotates forward at a low speed.

On the other hand, the transmission is also transmitted from this speed change shaft 15 via the idler 19 to the reverse gear 20 of the switching shaft 17 (though even if this is directly transmitted by a chain using a sprocket, the same reverse rotation occurs).
When this is moved upwardly in FIG. 1 by actuation of a forward/reverse switching fork 38, which will be described below, in conjunction with a slidable switching clutch 37 splined above, this clutch 37 is moved upwardly in FIG.
meshes with the reverse rotation gear 20, and when moving downward, meshes with the forward rotation low speed gear 18b, and through the forward/reverse switching and quick return mechanism 21 that becomes neutral at the intermediate position, the upper and lower concentric minor axis 2
2, 22', and finally to the right drive wheels 4, 4' by the bevel mechanisms 23, 23'.

Further, a part of the power is transmitted from the countershaft 22' to the left countershaft 25 and the bevel mechanism 26 via the chain transmission 24, and then to the left drive wheel 5.

In addition, since this pruning machine must be operated unmanned, it is necessary to automatically switch between high and low speeds and forward and backward movement as appropriate.

For this purpose, a high/low speed setting mechanism 27 and a forward/backward setting mechanism 28 are provided, and a large number of holes 31 are formed in a penetrating manner on a constant circumference of a wheel 30 etc. which is further decelerated by a worm mechanism 29 etc., for example. The arm 32' of the height setting dial 32 for high/low speed switching and the arm 3 of the height setting dial 33 for forward/reverse switching are attached to each of the front and back sides of the holes 31.
3', respectively, and when the machine is attached to a tree and raised, the wheel 30 rotates and the pins 34 and 35 rotate accordingly. The high/low speed change fork 36 connected to the high/low speed switching transmission 16 is operated, and the gear that had been engaged with the forward high speed gear 18a is now engaged with the forward low speed gear 18b to move forward at low speed. The machine is switched to a spiral ascending mode at a low speed, and when the chain saw 12 cuts off the branches on the way during this slow ascending and reaches the predetermined height setting position, the pin 35 switches the forward and backward movement and the quick return mechanism. The forward/reverse switching fork 38 connected to the freely slidable switching clutch 37 spline-fitted on the switching shaft 17 of 21 is actuated, and the switching clutch 37, which had been engaged with the normal rotation side low speed gear 18b, is reversed. It may be something that changes the gear to the quick return gear 20.

By the way, open the floating frames 6 and 7 and attach them to the trunk of the tree on which you are going to pruning, and contact the driving wheels 4, 4', 5 and the floating wheels 10, respectively. Visually estimate the height above, which normally does not require pruning work, and set the pin 34 using the high/low speed switching height setting dial 32 so that the height will move forward and upward to that height at high speed. Insert into the hole 31 corresponding to the height.

Next, determine the height at which the pruning work will be performed, that is, the forward/backward switching height, and use the forward/backward switching height setting dial 33 to perform the pruning work up to that height and switch between forward and backward travel when the pruning work reaches that height. pin 35
is inserted into the hole 31 corresponding to the height.

After these settings, when the engine 2 is started, the machine moves in a helical manner around the tree trunk using the driving force of the driving wheels 4, 4', and 5. After climbing to the position at high speed, the speed is changed to low speed and the pin 35 climbs to a set height at which the forward/reverse switching fork 38 is actuated.

During this time, the chain saw 12 is also rotating, so it cuts off the branch that is on its way up.

Next, the switching clutch 37 is actuated by the operation of the forward/reverse switching fork 38 by the pin 35 mentioned above, which in turn reverses the driving wheels 4, 4', 5 and descends in the same spiral pattern. (It returns quickly when descending.) As is clear from the above explanation, this device automatically switches the ascending speed from high speed to low speed that is suitable for pruning work when ascending.
Compared to conventional pruning machines of this type that can only increase speed at a low speed, pruning work time can be shortened.
Work efficiency can be improved.

Further, according to this invention, the high/low speed setting mechanism 27 is replaced by the height setting dial 32 for high/low speed switching.
In addition, the forward/reverse setting mechanism 28 in the forward/reverse switching mechanism can be operated and set using the forward/reverse switching height setting dial 33, and these operating settings can be adjusted to the high/low speed switching height with respect to the wheel 30. The pruning height and Visually check the thickness of the tree, turn the height changeover and forward/backward changeover dials for the foil 30 accordingly, and set the respective pins 34 and 35.
The operation setting can be made easily and reliably by simply engaging the , and the set value can be freely selected.

In addition, it is possible to change the forward/backward height and high/low speed according to the characteristics of the tree (bent tree, uneven tree, rotten branch tree, tree thickness, branch thickness, etc.) The effects can also be expected.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a self-elevating pruning machine according to this invention, and FIG. 2 is a schematic plan view of the same section. Code, 2... Engine, 3... Mission,
4, 4', 5...driving wheel, 10...idling wheel, 12
...Chain saw, 16...High and low speed switching transmission, 21...Forward/forward switching, quick return mechanism.

Claims (1)

[Scope of utility model registration request] The drive wheels 4, 4', 5 and the idler wheels 10... hold the tree from the surroundings, and the drive wheels 4, 4', 5...
The power of the engine 2 is transmitted to the engine 2 by an appropriate transmission means having a forward/reverse switching mechanism 21 in the transmission 3, and the chain saw 12 is raised and lowered relative to the tree, and is erected upward when the tree is raised. In a self-elevating type branch cutting machine that cuts branches in the middle with a machine, a high/low speed switching device 16 is provided in the appropriate transmission means, and a high/low speed setting mechanism 27 of this is provided.
With the height setting dial 32 for high/low speed switching,
Forward/forward setting mechanism 2 in the above forward/forward switching mechanism
8 can be operated and set by the height setting dial 33 for forward/reverse switching, and these operation settings can be set by the height setting dial 32 for high/low speed switching and the height setting dial for forward/reverse switching for the wheel 30. 33 each arm 32',
33' is operated and set by engaging pins 34 and 35.