JPH038729B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a trunk hitting device for a pruning machine, which maintains a good distance between the cut portion and the surface of the tree even if the surface of the tree has local irregularities. It has been made possible.

(Prior art and problems to be solved by the invention) A self-lifting pruning machine consists of a main body equipped with wheels for lifting and lowering, and a cutting part that is integrally or detachably attached to the main body. The machine uses a power unit such as an engine to drive wheels to move up the tree while the cutting section cuts branches protruding from the tree. In this case, the branches must be cut just close to the surface of the tree. For this reason, it has been proposed in the past to provide a stem stopper at the cut part, but
All of the conventional trunk hitters of this type have a problem in that their ability to maintain the distance from the surface of the standing tree is extremely unstable, making it impossible to properly cut branches. In particular, as shown in FIG.
As the branch leaves the surface, the distance L becomes unnecessarily large, resulting in a long remaining branch t', and not only can no pruning effect be expected, but also the lifting wheel 53 collides with the remaining branch t', causing the pruning machine 50 to rise. Disabled or disconnected part 52
The cutting part 52 may be unnecessarily displaced or shaken, for example, the cutting part 52 may be tilted significantly or the cutting part 52 may be separated from the surface of the tree T more than necessary as described above, and furthermore, the trunk contact body 51 may be damaged by the remaining branch t' If the branch runs over a protrusion such as a branch, the cutting part 52 may become unduly twisted, making it impossible to cut the branch, or an excessive load may be placed on the engine, causing the engine to stall. This problem also occurs when the trunk hitter 51 falls into the recess 54 on the surface of the standing tree T.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a trunk hitting device that can maintain an appropriate distance between the cutting part of a pruning machine and the surface of a standing tree even if the surface of the standing tree has local irregularities.

(Means for Solving the Problems) For this purpose, the present invention provides a pruning machine 1 comprising a main body 2 provided with lifting wheels 3 and a cutting part 4 attached to the main body 2. The connecting body 15 is attached to the attachment part 19 provided at the lower part of the tree, and the trunk hitting bodies 16 and 17 are attached to the upper and lower parts of the connecting body 15, respectively, so as to be swingable with respect to the surface of the standing tree. 14 (Function) By configuring the trunk contact device 14 in this way, either one of the two upper and lower trunk contact bodies 16, 17 can move against the convexity on the surface of the standing tree. The amount of displacement and fluctuation of the cutting part 4 when the cutting part 4 runs over a part or falls into a concave part is reduced, and the distance between the cutting part 4 and the surface of the standing tree is maintained appropriately, and the branch can be cut well.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the pruning machine 1 during pruning work, where 2 is the main body, 4 is the cutting part attached to the main body 2, and the main body 2 has wheels 3 for lifting diagonally. has been done. Reference numeral 5 denotes a base portion of the cutting portion 4, which is attached to the main body portion 2, and a sprocket 6 driven by an engine (not shown) is attached to the base portion 5. 7 is a lower frame erected on the base 5, 8 is an upper frame attached to the upper part of the lower frame 7, and guide wheels 9, 10 are attached to the upper frame 7. 1
1 is a saw chain, and the sprocket 6,
It is tuned to guide wheels 9 and 10, and when the sprocket 6 is driven by the engine, it rotates along the sprocket 6 and the guide wheels 9 and 10 to cut the branch t protruding from the tree T. 12, 12 are vertical long holes formed in the upper part of the lower frame 7,
The upper frame 8 has mounting tools 1 such as bolts and nuts.
3 and 13, it is attached to the upper part of the lower frame 7 so as to be vertically movable. That is, the upper frame 8
By moving up and down appropriately, the saw chain 11
The tension can be adjusted.

Reference numeral 14 denotes a trunk contact device (see also Fig. 2), which includes a rod-shaped connecting body 15 and a substantially rod-like connecting body 15, which is rotatably attached to the upper and lower parts of the connecting body 15, respectively, with the connecting body 15 as a rotation axis. Rolled trunk per body 16, 17
It is equipped with Reference numeral 18 denotes a threaded rod inserted into the center of the connecting body 15, and one end of which is connected to the attachment part 1.
9, and a mounting body 20 consisting of a thumbscrew is screwed onto the other end. 21 is the connector 1
5 and the mounting portion 19, a spring member 22 is a cap body of the spring member consisting of a coil spring inserted into the threaded rod 18. This spring material 21 is a standing tree T
It has a spring force in the radial directions a and b, and the above-mentioned trunk abutting bodies 16 and 17 are provided with this spring material 21 in between, and are swingable with respect to the surface of the standing tree (as indicated by the chain line in Fig. 2). reference).

In this way, the attachment part 19 is attached via the spring material 21.
The trunk hitting device 14 attached to the tree can be moved forward and backward in the radial directions a and b of the tree T by the spring force of the spring material 21, and by changing the screwing amount of the attachment body 20, it can be moved as shown in FIG. The connecting body 15 is advanced and retreated in the radial directions a and b of the tree T, and the trunk contact body 16,
By adjusting the position of the saw chain 17, the distance L between the saw chain 11 and the surface of the standing tree T can be adjusted. If the interval L is adjustable in this way, it is possible to easily adjust and set the best interval L according to the pruning conditions at a pruning site or the like. In the present invention, the radial directions a and b of the standing tree T include not only the strict radial direction but also the substantially radial direction and the substantially radial direction.

The attachment part 19 is vertically installed at the tip of an attachment body 23 that projects slightly upward from the lower part of the lower frame 7 in parallel with the traveling direction D of the pruning machine 1. 17 is located on the same perpendicular line PP as the guide wheel 9, that is, below the guide wheel 9. In addition, the rotational axis Q-Q of the trunk perpendicular bodies 16 and 17 (i.e., the axial center line of the connecting body 15) is
The direction is perpendicular to the traveling direction D of the cutting section 4. That is, the trunk perpendicular bodies 16 and 17 are perpendicular to P-P.
It is inclined at an angle θ to By increasing the interval 1 at which the tree can come into contact with the T surface, the trunk abutting bodies 16 and 17 can more advantageously come into contact with the tree T surface. 24 is a reinforcing member of the attachment body 23.

In the above configuration, when the engine is driven, the wheels 3 rotate and the pruning machine 1 spirally moves up the tree T in the direction of arrow D, and the saw chain 11 cuts the branch T. As shown by the chain line in Fig. 2, when the trunk hitter body 17 rides on the remaining branch t' at the height d,
The trunk bodies 16 and 17 swing, and both trunk bodies 1
The amount of displacement of the mounting portion 19 connected to the intermediate portion of the screws 6 and 17 via the threaded rod 18 is 1/2d. In this way, even if the trunk contact bodies 16, 17 ride on a convex part such as the remaining branch t', the displacement of the attachment part 19 will be half of the displacement of the trunk contact bodies 16, 17, and the displacement of the saw chain 11 will be reduced accordingly. is small, and therefore the variation in the distance L between the saw chain 11 and the surface of the standing tree T is small, the distance L can be maintained more appropriately, and the branches t can be cut well. Furthermore, the engine does not stall due to excessive load being applied to the engine due to the cutting portion 4 being twisted. This function is similarly exhibited when the trunk contact bodies 16 and 17 fit into the recess 25 on the surface of the standing tree T. In addition, if the spring material 21 is interposed between the trunk abutting bodies 16, 17 and the attachment part 19 as in this embodiment, its elasticity will absorb the irregularities on the surface of the standing tree T, and prevent the wobbling of the cutting part 4. can be better prevented.

The present invention is not limited to the above-mentioned embodiment, and various design changes are possible.For example, the above-mentioned embodiment is explained by taking as an example a pruning machine 1 equipped with obliquely installed lifting wheels 3. However, the present invention can also be applied to a vertically lifting type pruning machine, etc., in which the main body vertically rises along the tree while cutting branches using a cutting section that rotates around the main body. Furthermore, it is sufficient that at least two stem abutting bodies are attached above and below the connecting body, and it is not prohibited to attach other stem abutting bodies in addition to the above-mentioned stem abutting bodies 16 and 17.

(Effects of the Invention) As explained above, the present invention provides a pruning machine consisting of a main body equipped with lifting wheels and a cutting section attached to the main body. A connecting body is attached to the top and bottom of the connecting body, and trunk hitting bodies are attached to the upper and lower parts of the connecting body so as to be able to swing freely against the surface of the standing tree, thereby configuring the trunk hitting device. Even if the cutting part runs over a local convex part such as a branch or falls into a concave part, the displacement and wobbling of the cut part can be reduced, and the branch can be cut well while maintaining a more appropriate distance between the tree surface and the saw chain. Furthermore, even if the trunk abutting body rides on a convex part during cutting, the cut part will not be kneaded and an excessive load will be applied to the engine, resulting in various effects such as engine stalling.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention.
The figure is a side view during pruning, Figures 2 and 3 are side views of the trunk perching device, and Figure 4 is a side view of the conventional one. DESCRIPTION OF SYMBOLS 1... Branching machine, 2... Main body part, 3... Lifting wheels, 4... Cutting part, 14... Trunk hitting device, 15...
... Connecting body, 16, 17... Trunk contact body, 19... Attachment part.

Claims (1)

[Claims] 1. In a pruning machine consisting of a main body with lifting wheels and a cutting part attached to the main body, a connecting body is attached to the attachment part provided at the lower part of the cutting part, and the connecting body is connected to the upper part of the connecting body. A trunk hitting device for a pruning machine, characterized in that a trunk hitting body is attached to the lower part of each trunk so as to be swingable relative to the surface of the standing tree.