JPH0159857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pruning machine used to remove twigs from standing trees.

Pruning of standing trees is encouraged in order to obtain high-quality knotless wood from cedar, cypress, etc. In other words, when twigs emerge, pruning them as soon as possible will yield knotless, high-quality wood. Up until now, twigs had to be cut by hand using a hand saw, or by being cut off with a hatchet. However, when pruning with a manual saw or hatchet, the cut surface is not only rough and unsightly, but also the time it takes for the pruning to become knotless after pruning is 2 times longer than when using a manual saw.
It took about 20 years, and the one using a hatchet took about 6 years.
Furthermore, pruning with a manual saw or hatchet required considerable arm strength.

This invention was made to solve these problems, and uses an easily movable pruning machine to quickly cut off branches with little effort, and to finish the cut surface neatly, making it easy to remove branches after pruning. This shortens the period until it becomes a no-knot state.

Embodiments of the invention will be described based on the drawings.

In this invention, a flexible output shaft 19 is taken out from a small motor 24 configured to be carried on one's back, and a pruning circular saw 7 is connected to the tip of the flexible output shaft 19 via a grip part 2 that holds a circular saw. A saw casing that covers the non-cutting part of the circular saw 7 is fixed to the grip part 2, and two projecting pieces 29, 29 that sandwich the cutting part of the circular saw 7 are protruded from the saw casing,
Further, a throttle lever 22 is provided on the grip portion 2,
The throttle lever 22 is connected to a throttle valve of a small engine 24 via a throttle wire 21 disposed along the flexible output shaft 19.

The operator carries the small engine on his back, climbs the tree trunk 28, pinches the twig 27 between the protrusions 29, 29, and applies the circular saw 7 to the twig 27 to prune the twig.

Next, the rotating parts including the circular pruning saw and the grip will be explained.

A flexible output shaft 19 is provided to transmit the rotation of a small motor 24 equipped so as to be portable,
The outside is covered with a protective tube 20 for safety, and the tip is extended to the inside of the cylindrical grip part 2, and the outer box 1
The drive shaft 3 is installed inside the grip portion 2 and is slidably but unrotatably fitted onto the drive shaft 3 whose rear end extends into the grip portion 2. The drive shaft 3 is rotatably supported via a bearing 15, and the main shaft 4 has a bevel gear 6 disposed at its tip that rotates perpendicularly and in mesh with a bevel gear 5 provided at its tip. It is freely supported. In addition, the central part of the circular saw 7 has a holding part 8 which is recessed in the shape of a truncated cone.
A saw holding fitting 9 with a tapered recess that holds the front and back is placed on the outside, and a saw holding fitting 10 with a tapered outer peripheral surface is placed on the inside. The seated nut 11 is screwed onto the rear end of the main shaft 4 which is irremovably fitted and further protrudes, and is fixed so that the circular saw 7 will not move or fall off. Further, the main saw casing 13 surrounds approximately 3/4 of the circumference of the circular saw 7 in a semicircular arc shape, and the remaining portion is open and protruding in a U shape, and its end surface 13a and the end surface 7a of the circular saw blade portion are connected to each other. They are arranged so that they are almost on the same plane.

The remaining non-cutting portion of the main saw casing 13 is covered by the auxiliary saw casing 12 fixed to the outer box 1, and both are screwed together with machine screws or the like to form the saw casing. And the saw casing has a circular saw 7
Two protruding pieces 29, 29 are protrudingly provided with the cut portion sandwiched therebetween. Further, the saw casing is arranged so that the angle α with respect to the illustrated drive shaft 3 can be freely adjusted via a guide adjustment lens 25a attached to the outer box 1, and the rotation control of the small motor 24 is also possible. for,
Through the throttle wire 21 interlocked with this, the circular saw 7
The main branching machine is constructed so that the rotation of the main branch can be freely adjusted. 25 is a shoulder belt, and 26 is a body tightening band.

In use, the worker holding the cylindrical grip 2 first starts the small motor 24, rotates the drive shaft 3 via the flexible output shaft 19, and rotates the orthogonal meshing shafts provided at the ends. By means of the bevel gear 5 and the bevel gear 6, the main shaft 4 and the circular saw 7 fixedly attached to the rear end begin to rotate together. Fifth
As shown in the figure, the main saw casing end face 13a is tightly applied to the front and rear parts of the trunk 28 of the desired branch, and the twig 27 is sandwiched between the two protrusions 29, 29, and if necessary, the guide adjustment The angle of the trunk 28 and branches is adjusted according to the situation of the trunk 28 and branches using the photograph 25a, and the felling is carried out in such a way as to prevent swinging of the circular saw 7 as much as possible. At this time, the rotational speed can be easily adjusted by hand using the throttle lever 22.

In this way, in the pruning machine according to the present invention, the engine part and the rotating part are installed far apart, so
Vibrations that cause numbness in hands and fingers are greatly reduced.

In addition, the twig 27 is
Since the circular saw 7 is pressed against the twig 27 while sandwiching the twig, the positioning of the circular saw 7 is easy, and the protrusions 29, 29 guide the circular saw during cutting.
The reaction force applied to your hands is small, and pruning can be done safely and easily.

The two protrusions 29, 29 significantly increase safety when working by climbing a tree, and allow work to be done quickly and with peace of mind.

[Brief explanation of drawings]

The drawings are for explaining one embodiment of the pruning machine according to the present invention, and FIG. 1 is a schematic overall front view of the pruning machine, FIG. 2 is a partially cutaway overall front view of the rotating part, and FIG. FIG. 3 is a vertically cut side view of the main part of the rotating part, FIG. 4 is a cutaway view taken along the line A-A in FIG. 2, and FIG. 5 is a schematic diagram showing its usage. DESCRIPTION OF SYMBOLS 1... Outer box, 2... Cylindrical grip part, 3... Drive shaft, 4... Main shaft, 5... Bevel gear, 6... Bevel gear, 7... Circular saw, 7a... End face, 8... holding part,
9...Saw holder metal fitting, 10...Saw holding metal fitting, 11...
Nut, 12... Secondary saw casing, 13... Main saw casing, 13a... End face, 17, 18... Guard, 19... Flexible output shaft, 20
... Flexible protection tube, 21 ... Throttle wire, 22 ... Throttle lever, 23 ... Throttle lever cover, 24 ... Small engine, 2
5... Shoulder belt, 25a... Shooting for adjustment, 2
6... Body tightening band, 27... Twig, 28...
Trunk, 29...projection.

Claims (1)

[Claims] 1. Take out the flexible output shaft 19 from the small motor 24 configured to be carried on the back, connect the pruning circular saw 7 to the tip of the flexible output shaft 19 via the grip part 2 that holds the circular saw, and A saw casing that covers the non-cutting part is fixed to the grip part 2, and two projecting pieces 2 sandwich the cutting part of the circular saw 7.
9 and 29 protruding from the saw casing, and a throttle lever 22 is provided on the grip portion 2, and the throttle lever 22 is small-sized and actuated via a throttle wire 21 disposed along the flexible output shaft 19. A pruning machine characterized by being connected to the throttle valve of machine 24.