JPH0638725B2 - Pruning machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pruning machine, and more particularly to a pruning machine configured to be able to quickly and reliably drop a branch of a standing tree along its trunk from its base.

In the field of forestry, in order to obtain high-quality grain wood without knotting, pruning work is carried out in which the upper branches and leaves of the tree are left in the growing process of the tree and the lower branches are sequentially dropped. This pruning operation requires that the technique be completely dropped from the base of the trunk along the trunk so that no cut-out protrusions are left on the trunk surface. This is because if the protrusions are left, then an annual ring is formed so as to cover the protrusions, which deteriorates the quality of the wood for construction.

In the traditional pruning work, a worker used to prun the branches. In such pruning work, as described above, in order to completely remove the branch from the base, the difficult work of acting the nata at the root of the branch along the trunk was climbed onto the tree and held the trunk. It is inefficient and the operator's fatigue is high because it has to be done in a state, extremely difficult and dangerous, and because each tree has to climb on that tree, work continues for a long time. I couldn't.

In addition, conventionally, various power type pruning machines have been developed in which a force for dropping off a branch is obtained by power, and a typical example thereof is, for example, SAIKAI 57-23158.
There is a pruning machine described in the publication. This pruner covers the circumference of the circular saw in a semi-circular shape in order to make the circular saw act along the bark with respect to the root of the technique, and is on the same plane as one side of the circular saw. It is characterized in that a U-shaped guide member having a guide surface located inside is provided.
In this pruning machine, as shown in FIG. 5 of the above publication, a pair of guide portions of the U-shaped guide member are brought into contact with the bark so as to sandwich the branch to be cut off in the vertical direction of the trunk. Then, when the circular saw is moved laterally as it is, the circular saw having a side surface substantially flush with the guide surface of the guide member cuts the branch from the root without leaving a bump-like projection. It is a thing.

However, in such a pruning machine, since the circular saw cuts the cross section of the branch in the lateral direction, if the branch sways toward the circular saw side due to wind, etc., it will be connected to the trunk of the branch. Due to the lever action with the part that is the fulcrum as a fulcrum, the cutting surface at the base of the opposite branch that sandwiches the cut circular saw sandwiches the circular saw with a strong force, and the rotation of the circular saw is stopped and the work can be continued. In addition to the disappearance, the phenomenon that the circular saw bites into the cut edge in a state where the circular saw cuts halfway and the circular saw cannot be removed frequently occurs.

When cutting off a branch, the fact that the blade should cut through the branch from top to bottom means that in the traditional work of conventional nata, the nata must be swung down from top to bottom. Is clear from. Even if the nata is acted from below or on the side of the branch, the nata will bite into the cut due to the weight of the branch or the lateral shaking.

An operator who uses the pruning machine shown in the above publication often uses a circular saw to bite the cut end of the branch when using the pruning machine according to the usage of the pruning machine. I have no choice but to operate the circular saw so that it cuts down.
In this case, the existence of the U-shaped guide member that can position the circular saw along the trunk is lost only when the pair of guide portions sandwich the branch to be cut vertically. When the circular saw of the pruning machine is operated so as to cut down the branches from top to bottom, the pair of guide parts of the guide member are positioned so as to sandwich the branches on the left and right, but the surface of the trunk is a cylinder. This is because even if this is done, the circular saw does not look like it is along the surface of the trunk.

As I mentioned a little earlier, the branches of a tree are made to cut their roots from top to bottom, the branches gradually tilt downward due to their own weight, and the cut ends widen and shrinks. The knife should not be caught in the cut.

The present invention has been made in view of the above, and an object thereof is to be able to quickly, reliably, and easily cut off a tree branch from its root completely, and further, extremely easy to operate. It is to provide a pruning machine.

In order to achieve such an object, the present invention takes the following technical means.

That is, in a pruning machine in which a rotary blade is attached to the tip of a handle rod, a flat plate shape that partially covers the front side surface of the rotary blade and faces the front side surface of the rotary blade in parallel with a slight distance from the front side surface. That is, the back plate of is attached.

The above-mentioned backing plate is attached in parallel to one side surface of the rotary blade, that is, the surface facing the trunk, with a slight gap therebetween. Therefore, when the abutting plate is brought into contact with the lateral line of the trunk, the rotary blade is automatically positioned in parallel with the lateral line of the trunk at a slight interval. By positioning the rotary blade on the side line that passes through the branch to be cut as described above, the rotary blade can be slid downward along the side line, and the branch will be cut almost from its root. To be done. At this time, since the abutting plate remains in contact with the side line of the trunk, it is extremely easy to operate the handle rod to slide the rotary blade as described above. Since the backing plate is located on the front side surface of the rotary blade 2, as long as the backing plate is in contact with the trunk, the rotary blade tilts and its blade portion comes into contact with the trunk. There is no need to worry about damaging your. Further, since the rotary blade cuts the branches from the top to the bottom, the rotary blade does not bite into the cut edge due to shaking of the branches as in the conventional example.

As described above, in the pruning machine of the present invention, the work of guiding the rotary blade to the most suitable position for the branch to be cut can be extremely facilitated by the action of the contact plate provided on one side of the rotary blade. Efficiency is dramatically improved.

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an example of the pruning machine according to the present invention as a whole and its usage. In this drawing,
A rotary blade 2 is attached to the tip of the handle rod 1 and a prime mover 3 is attached to the rear end of the handle rod.
It goes without saying that the present invention can be changed to a type in which the prime mover can be carried on the back of the operator, and the handle rod also serving as the operating rod and the prime mover are linked by the flexible transmission shaft.

The details of the structure of the tip portion of the handle rod 1 which is the main part of the present invention are shown in FIGS.

A transmission shaft 4 is rotatably inserted through the inside of the handle 1. The rear end of the drive shaft 4 is, for example, a centrifugal clutch (not shown) with respect to the prime mover 3 attached to the rear end of the handle 1. It is connected through. A gear housing 5 is fixed to the tip of the handle 1. The rotary blade support shaft 6 and the handle 1 are supported inside the handle 5 so as to be substantially orthogonal to the handle 1. A pair of bevel gears 7 and 8 connect the inserted transmission shaft 4 to each other. The rotary blade 2 is attached to the tip of the support shaft 6. Transmission shaft 4 and support shaft 6
As a result of making the and substantially at right angles to each other, the rotary blade 2 becomes substantially parallel to the handle rod 1. Also,
As shown in FIG. 2, the central portion of the rotary blade 2 is depressed, and the support hole 9 opened in this portion is inserted into and supported by the tip portion of the support shaft 6 to support the support shaft 6 and the support shaft 6. The tightening nut 9a to be screwed onto the front side surface 2 of the rotary blade 2 is
It does not protrude from a.

In the present invention, a backing plate 10 that partially covers the front side surface 2a of the rotary blade 2 and that faces the front side surface 2a in a parallel manner with a slight clearance is attached. In the example shown in FIGS. 2 and 3, the collar portion 1 of the gear housing 5 is
Highly rigid support piece 1 whose base end is fixed with screws 12 etc.
3 is extended upward in a direction substantially coinciding with the direction of the handle 1, and its tip is biased so that this portion 13a slightly projects from the front side surface 2a of the rotary blade 2 and is parallel to the rotary blade 2. While forming the contact plate mounting surface 14, a support member 16 having a contact plate mounting surface 15 that slightly protrudes from the front side surface 2a of the rotary blade 2 and is parallel to the rotary blade is fixed to the handle rod 1, Both ends of a thin plate-shaped pad plate 10 having a constant width are fixed to the pad plate mounting surface 14 of the piece 13 and the pad plate mounting surface 15 of the support member in a spanning manner in the diameter direction of the rotary blade. In the illustrated example, the third
As shown in the drawing, an extension portion 18 having a contact surface 17 in the same plane as the contact surface (side surface) of the contact plate 10 is integrally formed on the support member 16, and the extension portion 18 has A branch to be cut is applied to the side edge to provide a function as a guide for sliding the pruning machine.

The contact plate 10 should be as close as possible to the rotary blade 2, but between the side surface 10a of the contact plate 10 and the front side surface 2a of the rotary blade 2, the contact plate 10 of the rotary blade 2 and A gap corresponding to the sum of the clearance between them and the thickness of the contact plate 10 occurs. However, it is quite possible to keep this drop within a few millimeters. From such a thing,
Strictly speaking, the cutting surface of the technique cut by this pruning machine has a height corresponding to the above-mentioned drop with respect to the bark, and this is enough for pruning quality. It is within an acceptable range.

Next, a method of using the pruning machine of the embodiment shown in FIGS. 2 to 4 will be described with reference to FIGS. 5 and 6.

As shown in FIG. 5, the patch plate 10 is applied to the trunk above the branch B to be cut so that the side surface 10a linearly contacts the lateral line C of the bark A containing the branch B. At this time, as shown in the drawing, when the side edge of the extension portion 18 of the support member 16 is leaned against the technique B, the handle rod 1
Since the worker does not have to support that the
You can work easily. The rotary blade 2 is rotating in the arrow direction. After deciding the position of the rotary blade 2 as shown in FIG. 5, the handle rod 1 is left as it is in the axial direction, that is, the arrow Q in FIG.
When it is slid in the direction, the rotary blade 2 moves the branch B to be cut.
Since it moves in an imaginary plane that is in contact with the trunk at a lateral line C including B, the branch B is reliably cut from its root substantially along the bark. As is apparent from the figure, since the pad 10 is interposed between the rotary blade 2 and the bark A, there is no fear that the rotary blade 2 carelessly contacts the trunk and damages the bark. Further, since the backing plate 10 has a certain width, the rotary blade 2 does not wobble even if the inclination angle α of the handle 1 with respect to the side line C is selected in a wide range from approximately 0 ° to 90 °. The angle of the handle rod can be selected as the most suitable angle depending on the condition of the surrounding branches, which greatly contributes to the improvement of work efficiency. Of course, in the pruning machine of the present invention, the rotary blade 2 cuts the branch B from the upper side to the lower side, so that the rotary blade is caught in the cut edge due to the branch swaying as in the conventional example. Nor.

Further, in this embodiment, since the blade portions of the rotary blade 2 face the support piece 13 supporting the upper end of the backing plate 10 or the left and right sides of the backing plate 10, the handle rod 1 can be tilted in either the left or right direction. You can work. As will be described below, this has a special effect that the skillful work can be performed skillfully without changing the position where the worker stands.

That is, as shown in FIG. 6, the branches extend radially from the trunk.
Standing in the area indicated by, the branch a to the front or to the right,
With respect to b and c, the handle 1 can be cut off while tilting to the right, and with respect to the branches d and e facing leftward, the handle 1 can be held up while tilted to the left. With respect to the branches e, f, g on the back side of the trunk, the same work as described above may be performed by standing in the area E on the side opposite to the area D. The planted area is usually on the slope of a mountain with a fairly large slope, but if the area D where the worker stands is set on the contour line E passing through the trees, the branches extending to the mountain side and the valley side can be raised to the same height. Can be knocked down.

7 and 8 show another embodiment of the present invention.

In the embodiment shown in FIG. 1 to FIG. 6, the contact plate 10 is fixed so as to be diametrically suspended on the front side surface 2a of the rotary blade 2, whereas in this example, the contact plate 10 is fixed. It is formed in a half-moon shape so as to cover almost half of the side surface 2a of the rotary blade 2, and the abutting plate 10 is fixed to the circumferentially offset portion of the half-moon-shaped top cover 13a whose center is fixed to the gear housing 5. Has been done. Note that in this example,
The patch plate 10 is located in parallel to the front side surface 2a of the rotary blade 2 with a slight gap therebetween, as in the example shown in FIGS. 1 to 6 described above. When the handle rod 1 is slid downward as it is so as to be in linear contact with the lateral line of the trunk including the branch to be cut, the branch is completely cut from the root. In this example, it is not possible to perform the pruning work by inclining the handle rod 1 in both the left and right directions as in the example shown in FIGS. 1 to 6, but since the area of the backing plate is large, this is used as bark. Rotating blade 2 when applied
The stability of the rotary blade is improved, and the rotary blade does not inadvertently contact a branch that should not be cut and damage it.

As described above, the pruning machine of the present invention partially covers one side surface of the rotary blade, and has the contact plate positioned parallel to the rotary blade with a slight interval, If this contact plate is brought into linear contact with the lateral line of the trunk containing the branch to be cut, the rotary blade can be guided to the most appropriate position, so that the pruning work can be carried out efficiently and You can do it easily.

[Brief description of drawings]

1 to 6 are views relating to a first embodiment of the present invention, FIG. 1 is an overall view showing a usage state, and FIG. 2 is
FIG. 3 is a partial sectional side view, FIG. 3 is a front view, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIGS. 7 and 8 are diagrams relating to the second embodiment of the present invention, FIG. 7 is a front view, and FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 1 ... Handle bar, 2 ... Rotary blade, 2a ... Front side surface (of rotary blade), 10 ... Patch plate

Claims (1)

[Claims] 1. A pruning machine in which a rotary blade (2) is attached to the tip of a handle rod (1), the front side surface (2a) of the rotary blade (2).
A pruning machine, which partially covers the front surface of the rotary blade (2) and is attached in parallel with the front side surface (2a) of the rotary blade (2) at a slight distance. .