JPH039638Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a chain saw positioning device that maintains a constant distance between a chain saw installed in a branching machine and the surface of a trunk.

(b) Prior Art In a conventional positioning device for a branch cutting machine, a positioning body that maintains a constant distance between the chain saw and the trunk is provided on the inner surface of the trunk side above the chain saw, and the positioning body maintains a constant distance between the chain saw and the trunk. The positioning body is rotatably supported so as to elastically return so as not to bite into the cut part of the chain saw. When the positioning body comes into contact with the branch, it rotates from the cutting part side of the chainsaw at the set position to the non-cutting part side. (See, for example, Japanese Patent Publication No. 56-21365).

(c) Problems to be solved by the invention In the conventional chain saw positioning device,
When the positioning body comes into contact with a branch, it rotates from the cutting side of the chain saw to the non-cutting side to avoid the branch, so the positioning body moves far away from the cutting area of the chain saw and comes into contact with the trunk. The distance between the chain saw maintained by the positioning body and the trunk became narrow, causing the positioning body to lose its function, causing the cutting part of the chain saw to cut the branch low, causing damage to the surface of the trunk. .

In other words, the positioning body cannot perform its positioning function unless it is positioned near the cutting part of the chain saw, which is placed tangentially to the center of the trunk. As a result, the chain saw moves far from the cutting part to the non-cutting part, and therefore cannot perform its positioning function.

In addition, since the positioning body is located behind the cutting part, the positioning body can be avoided after the cutting part of the chainsaw has bitten into the branch, and as described above, the positioning body can avoid the branch. Because the cutting height is changed, the chainsaw may be twisted in the middle of cutting the branch, resulting in overload and the engine stalling, or the branch may be cut in two stages even though the cutting part does not damage the surface of the trunk. This resulted in problems such as poor wrapping of the bark.

In this invention, even when the positioning body rotates due to contact with a branch and avoids the branch, the original function of the positioning body is not lost, and the cutting height of the branch is maintained constant.
Positioning of a chainsaw that does not damage the surface of the trunk, prevents engine stalling and double-cutting of branches, and maintains a constant branch cutting height regardless of the diameter of the trunk. The purpose is to provide equipment.

(d) Means for solving the problem In order to achieve the above object, the chain saw positioning device for the branching machine of the present invention has the following features:
The base 12b of the positioning body 12 is rotatably supported on the side of the non-cutting part 8b of the chain saw 8 via a shaft 13, and the free end part 12a thereof is positioned to intersect with the cutting part 8a of the chain saw 8 and protrude forward. , the inner surface of the movable tip 12a of the positioning body 12 on the side in contact with the trunk 3 is formed into a flat oblique surface 12c, so that the positioning body 12 can move up and down along the cutting part 8a of the chain saw 8 by contacting with the branch 9. It is designed to rotate in the direction.

(E) Effect In the chain saw positioning device configured as described above, the flat surface 12c on the side of the floating tip 12a of the positioning body 12 comes into contact with the trunk 3, and the flat surface 1
The cutting section 8a of the chain saw 8 is positioned outside the contact section of the chain saw 2c with respect to the trunk 3, and the cutting height of the branch 9 of the cutting section 8a is maintained constant, and the positioning body 12 adjusts the set position of the cutting section 8a. When the positioning body 12 comes into contact with the branch 9, the positioning body 12 rotates vertically along the cutting part 8a due to the pressing force received from the branch 9 to avoid the branch 9, and then the branch 9 and the chain saw 8 The positioning body 1 is cut by the cutting part 8a of
At the same time, the rotating positioning body 12 moves up and down along the cutting part 8a, and the contact surface of the trunk 3 of the floating tip 12a is brought into contact with the flat surface 12c. Therefore, even if the contact point of the positioning body 12 itself with respect to the trunk 3 changes in the left and right longitudinal directions, the positional relationship between the trunk 3, the positioning body 12, and the chain saw 8 does not change, and the chain saw 8 can cut. The distance between the portion 8a and the surface of the trunk 3 is maintained as initially set, and the trunk 3
It is possible to prevent damage to the surface of the branch 9, engine stalling due to overload, or double cutting of the branch 9.

In addition, regardless of the diameter of the trunk 3 to be cut, the positioning body 12 forms an oblique surface 12c on the trunk 3 abutting surface of the floating tip 12a parallel to the chain saw 8, so that The chain saw 8 contacts the trunk 3 at the same position, and the distance between the chain saw 8 and the surface of the trunk 3 is always maintained constant.

(F) Embodiment An embodiment will be described with reference to the drawings. In FIGS. 3 and 4, the pruning machine has a main arm 1 and a wrapping arm 2 forming a circular frame surrounding a trunk 3. , Main arm 1 has 4 on the left and right and up and down.
The winding arm 2 is equipped with two upper and lower idler wheels 5, 5, and these drive wheels 4, 4... are attached to the winding arm 2.
4... and the idler wheels 5, 5 hold the outer periphery of the trunk 3.

On the other hand, the prime mover 6 and its power are appropriately decelerated so as to be able to swing in a horizontal plane, centering on a vertical drive shaft (not shown) on which the right upper and lower drive wheels 4, 4 are mounted on the main arm 1, and the vertical drive shaft A transmission case 7 is installed which transmits the power to the drive wheels 4, 4... through the transmission case 7, and a chain saw 8 is installed which extends upward from the transmission case 7. , is configured to be driven by the power of a prime mover 6.

Therefore, this pruning machine is attached to the trunk 3, and the prime mover 6
When started, the drive wheels 4, 4, . . . are driven to move the trunk 3 upward in a spiral manner, and the chainsaw 8 cuts off the branches 9 on the way up.

In addition, this pruning machine has its transmission case 7.
A vertical switching device operated by an operating mechanism 10 is built in the pruning machine, and when the pruning machine ascends a preset distance, the drive wheels 4, 4, etc. are reversed and descended. .

In the positioning device of the present invention, the positioning body 12 is configured as follows, and is attached to the inner side of the trunk 3 contacting side at the distal end position of the chain saw bar 11 that fits and guides the beltless chain saw 8.

That is, as shown in FIGS. 1 and 2, the base 12b of the positioning body 12 can be freely rotated via the shaft 13 toward the non-cutting portion 8b side behind the width direction center line A-A of the chain saw 8. At the same time, the floating tip 12a is positioned to intersect with the cutting portion 8a of the chain saw 8 and protrude slightly forward, and the floating tip 12a escapes so as to rotate when it comes into contact with the branch 9. It is formed into an arc shape with corners, and its inner surface on the side that contacts the trunk 3 is formed into a flat oblique surface 12c, so that its free-floating tip 12a is always connected to the chain saw 8.
A return spring 14 that rotates and returns to the vicinity of the cutting portion 8a or the protruding setting position is interposed therebetween.

As shown in FIGS. 1 and 2, the specific mounting structure of the positioning body 12 is such that one end is fixed to the outer surface of the chain saw bar 11 on the side opposite to the side where the trunk 3 contacts, and the other end is fixed to the outer surface of the chain saw bar 11. The mounting body 15 extends to the rear position of the non-cutting portion 8b so as not to interfere with the
From the middle part, which is slightly behind Chainsaw 8,
A receiving piece 16 is provided protruding from the inner side on the trunk 3 side, and the base 12b of the positioning body 12 is rotatably attached to this receiving piece 16 via the shaft 13, and the positioning body 1
between the base 12b of 2 and the end of the mounting body 15,
A return spring 14 is interposed therebetween.

Therefore, as shown in FIG.
When the floating tip part 12a of the chain saw 8 comes into contact with the lower end of the branch 9, the positioning body 12 resists the return spring 14 and moves the cutting part 8a of the chain saw 8, as shown by the imaginary line.
The branch 9 rotates downward along to avoid the branch 9, and the branch 9
It is cut by the cutting part 8a of the chain saw 8 without being obstructed by the positioning body 12.

Even if this positioning body 12 rotates as shown in the imaginary line, its contact surface with respect to the trunk 3 is on the flat surface 12.
c, the cutting portion 8a of the chain saw 8 always comes into contact with the trunk 3 at the set position, and the distance between the chain saw 8 and the trunk 3 is maintained constant.

That is, even if the positioning body 12 contacts the branch 9 and rotates up and down along the cutting part 8a of the chain saw 8, the trunk 3 of the flat surface 12c of the positioning body 12 itself
Although the contact point for the chain saw 8 is changed in the left and right longitudinal directions, the positional relationship of the chain saw 8 with respect to the cutting part 8a and the contact position with respect to the trunk 3 are maintained as originally set, and the relationship between the chain saw 8 and the surface of the trunk 3 is maintained as originally set. The spacing is kept constant.

When the above-mentioned cutting of the branch 9 is completed, the positioning body 12 that has been rotated is rotated upward by the return force of the return spring 14 and then rotated back to the original position.

Note that the rotation center line of the positioning body 12 at the set position is set to be inclined at an angle of θ with respect to the horizontal line, and this θ angle is an angle that does not match the lead angle θ-1 of the drive wheels 4, 4... With this angle setting, when the positioning body 12 comes into contact with the branch 9, its rotation can be smoothly avoided, and the positioning body 12 can be positioned so that it does not interfere with the chain saw 8. A spacer 17 is interposed between the outer surface of the body 12 on the side opposite to the side in contact with the trunk 3 and the chainsaw bar 11.

(g) Effects of the invention Since the present invention is configured as explained above, it produces the effects described below.

Even if the positioning body 12 rotates due to contact with the branch 9 and avoids this, the set positions of the chain saw 8, the positioning body 12, and the trunk 3 do not change, and the surfaces of the chain saw 8 and the trunk 3 do not change. Since the spacing between the two is maintained constant, the cutting height of the branch is maintained at a predetermined constant height, and the cutting height of the branch is maintained at a predetermined constant height. This also prevents the engine 6 from stalling or the branch 9 from being cut in two stages due to overload.

Further, the floating tip portion 12a of the positioning body 12 is positioned to protrude forward from the cutting portion 8a of the chain saw 8,
Since the branch 9 is cut after the positioning body 12 rotates, the positioning body 12 is moved by the chain saw 8.
Moreover, the positioning body 12 contacts the trunk 3 without changing the set position with the cutting part 8a of the chain saw 8, regardless of the diameter of the trunk 3. Therefore, the distance between the chain saw 8 and the surface of the trunk 3 is maintained as set, and the cutting height of the branch 9 is maintained constant.

[Brief explanation of drawings]

Fig. 1 is a front view of the positioning device according to the present invention, Fig. 2 is an enlarged partial cross-sectional view thereof, Fig. 3 is a front view of a pruning machine implementing the present invention, and Fig. 4 is a plan view thereof. be. 3... Trunk, 4... Drive wheel, 8... Chain saw, 8a...
Cutting part, 8b... Non-cutting part, 9... Branch, 12... Positioning body, 12a... Floating tip part, 12b... Base part, 12
c... Oblate plane.

Claims (1)

[Scope of utility model registration request] A chain saw 8 is equipped to hold a tree trunk 3 from its surroundings by driving wheels 4, 4, etc., and to drive the driving wheels 4, 4, etc., to raise and lower the trunk 3 while standing upward. is rotated spirally upward relative to the trunk 3 to cut the branches 9 along the way, and a positioning body 12 is provided on the inner surface of the chain saw 8 on the trunk 3 side to set the cutting height of the branches 9. is provided, and the positioning body 12
In this pruning machine, the base 12b of the positioning body 12 is rotated and moved by contacting with the branch 9 to avoid the branch 9, and the base 12b of the positioning body 12 is connected to the non-cutting part 8b of the chain saw 8.
It is rotatably supported on the side via a shaft 13, and its floating tip 12a is connected to the cutting section 8a of the chain saw 8.
The inner surface of the floating tip 12a of the positioning body 12 on the stem 3 abutting side is formed into a flat oblique surface 12c, and the positioning body 12
A positioning device for a chain saw in a branch cutting machine, characterized in that the chain saw 8 is rotatably moved in the vertical direction along a cutting section 8a by contact with a branch 9.