JPH0638724B2 - 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 is extremely difficult and dangerous to perform, and it has to be stuck on each tree. 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 an outer surface that is substantially flush with the guide surface of the guide member cuts the branch from its root without leaving a bump-like projection. It was done.

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 consideration of the above, and an object thereof is to quickly, reliably, and easily cut a tree branch completely from its root, and to cut a branch that is not a cutting target. It is to provide a pruning machine configured so as not to be damaged.

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

That is, a rotary blade that is substantially parallel to the handle rod is attached to the tip of the handle rod so that the mounting member does not project from the front side surface of the rotary blade. The first guide portion located in a plane which is located at a distance in the radial direction with respect to the outer peripheral edge which leaves a quarter portion corresponding to the lower half of either the left or right of the handle rod of the rotary blade. And a second guide portion below the rotary blade, which is located in a plane substantially coinciding with the front side surface of the rotary blade and extends in substantially the same direction as the handle rod. ,.

The first guide portion, the front side surface of the rotary blade, and the second guide portion are
They are almost in the same plane, and there are no protrusions such as attachment members from the front side surface of the rotary blade. Therefore, when the handle rod is brought into the bark parallel or slightly inclined to the tree and the first guide portion and the second guide portion are brought into contact with the bark lateral line including the branch to be cut at the same time, the rotary blade is , Its front side is automatically positioned so as to abut on the lateral line. At this time, there is no concern that the rotary blade may inadvertently contact and damage the bark. After positioning the rotary blade as described above, the handle rod is regulated in the sliding direction of the handle rod by applying the side portion of the handle rod itself or the side portion of the second guide portion to the branch to be cut. By simply sliding the shaft downward in the axial direction of the handle, the branch will
Completely cut from the root. In the present invention, since the blade on the peripheral edge of the rotary blade is exposed only in the lower half of the left or right half with respect to the handle rod, as described above, the handle rod or the second guide. When the handle is pulled down while applying a branch to the part, the blade at the position almost intersecting with the handle, that is, the lower end of the rotary blade automatically cuts the branch from top to bottom. .

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 is extremely easy due to the action of the first guide portion and the second guide portion, so that the work efficiency is improved. Is dramatically improved. Also, since the branches are basically cut from top to bottom, unlike the conventional method, the rotary blade does not bite into the cut edge and the rotation of the rotary blade is not stopped, and the branch is cut very quickly and reliably. can do. Further, in the present invention, the peripheral edge of only the lower quarter of the rotary blade is exposed, and the other peripheral edge is covered with the first guide portion, so that other branches are inadvertently cut or damaged. There is no such thing.

In the field of forestry, in order to obtain good-quality grain wood, all lower branches in a predetermined upper and lower range are cut, but in tree stands and fruit trees of street trees, branch pruning is performed. That is, there are branches that should be cut off and branches that should be left. In such a case, as described above, the pruning machine of the present invention is suitable for surely cutting only the branch to be cut and not worrying about damaging other branches.

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 also be applied to a type in which the prime mover can be carried on the back of an operator, and the handle rod also serving as the operating rod and the prime mover are linked by a flexible transmission shaft.

The details of the structure of the tip of the handle rod 1 which is the main part of the present invention are shown in FIGS. 2 and 3.

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. 3, the central portion of the rotary blade 2 is recessed, 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, of the peripheral edge of the rotary blade 2, only a quarter portion A corresponding to the lower half of either the left or right of the handle rod 1 is exposed, and the remaining portion is radially outward. Is located in a plane P that substantially coincides with the front side surface 2a of the rotary blade 2 and is located at a slight distance from the first guide portion 10.
Is provided. This includes, for example, FIGS.
As shown in the drawing, the central portion 11a of the fan-shaped cover 11 having a central angle of approximately 270 ° clockwise from the direction of the handle 1 and a radius slightly longer than the radius of the rotary blade 1 is provided. This cover 11 is fixed to the flange 12 of the gear housing 5
It is advisable to bias the peripheral edge portion of the rotary blade 2 so as to be located in substantially the same plane as the front side surface 2a of the rotary blade 2, and allow the biased portion 11b to function as the first guide portion 10. In the illustrated example, as well shown in FIG.
The edge part from the central part to the peripheral part is greatly engraved in a semicircular shape. This is to allow a branch to be cut to escape to this dug-up portion so that a branch with a considerable thickness can also be cut (see FIG. 4).

On the other hand, the handle rod 1 is located below the rotary blade 2 in a plane P that substantially coincides with the front side surface 2a of the rotary blade 2 and extends in a direction substantially coincident with the handle rod 1. A part 13 is attached. In the illustrated example, as well shown in FIGS. 2 and 3, a strip-shaped plate member 14 having a constant width is provided through a plurality of supporting members 15 to form the handle rod 1
It is configured by fixing to. The second guide portion 13 does not have to be plate-shaped as in the illustrated example, and a rod-shaped member may be attached to the handle rod 1.

In this way, the first guide portion 10, the front side surface 2a of the rotary blade 2, and the second guide portion 13 are positioned side by side in the direction of the handle rod 1 on the same plane substantially parallel to the handle rod 1. It will be.

Next, the usage of the pruning machine of the present invention will be described with reference to FIGS. 5 and 6.

5 and 6 show only the members or portions of the pruning machine of the present invention that are in direct contact with the bark B or the branches C, that is, the first guide portion 10, the rotary blade 2 and the second guide portion 13. Is schematically shown.

FIG. 5 shows the case where the pruning work is performed with the handle rod 1 set up most. First, as shown by the solid line, the rotary blade 2 is located above the branch C to be cut, and both the first guide portion 10 and the second guide portion 1 are on the side line D including the branch C on the bark. Make contact with B. First guide part 1
0, the front side surface 2a of the rotary blade 2, and the second guide portion 13 are all in the same plane, so that the position of the rotary blade 2 with respect to the bark at this time is very close to and parallel to the lateral line D. Is decided. That is, the upper or lower part of the rotary blade 2 is not swung so as to approach the bark B and the bark is not accidentally scratched or damaged. At this time, as shown in the figure, when the second guide portion 13 is leaned against the branch C to be cut, the sliding movement direction of the handle rod 1 is guided and determined by the branch C, so Easy to do. When the second guide portion 13 is rod-shaped, the handle rod 1 may be leaned against the branch C to be cut. The rotary blade 2 is rotating in the arrow direction.

Next, when the handle rod 1 is slid in the axial direction (direction of arrow Q), the rotary blade 2 cuts the root of the branch C from the upper part as shown by an imaginary line, and the handle rod 1 is further arrowed. When the slide C is moved in the Q direction, the branch C is completely cut.

FIG. 6 shows that the branch C can be cut in exactly the same manner by tilting the handle rod 1 further than in the state shown in FIG. That is, in the present invention, since the range in which the first guide portion 10 is provided is a wide range outside the peripheral portion of the remaining left portion of the rotary blade 2, the handle rod 1 is arranged as shown in FIG. Even if it is tilted considerably, the first guide portion 10
It is possible to allow both the second guide portion 13 and the second guide portion 13 to contact the bark B on the side line D including the branch C to be cut.

As described above, in the pruning machine of the present invention, the rotary blade is brought into contact with the side line including the branch to be cut by the action of the first guide portion and the second guide portion which are formed at positions vertically sandwiching the rotary blade. Since it is possible to move in a virtual plane defined by a line, it is possible to quickly, reliably, and easily cut the branch from the root of the branch. Further, in the present invention, since the rotary blade cuts from the top to the bottom of the branch, the problem that the rotary blade is fixed by being sandwiched between the cut edges as in the conventional case cannot occur. Further, since the rotary blade, each guide portion or the handle rod are substantially parallel to each other,
It suffices to apply force so as to pull the handle rod in its axial direction, and there is no waste of operating force, and pruning work can be performed easily.

Further, in the present invention, only the lower quarter portion of the peripheral edge portion of the rotary blade is exposed as the cutting action portion, and the remaining portion is covered by the first guide portion, so that the branch other than the branch to be cut is There is no need to worry about the rotating blade touching and damaging it. This is very convenient, for example, for pruning the branches of street and fruit trees. Further, as shown in FIGS. 5 and 6, the above pruning work can be similarly performed from the case where the handle rod is set upright to the state where it is tilted considerably. Even if it gets in the way, the branch can be avoided so that the handle can be tilted and the work can be performed without hindrance, so the convenience of use becomes very good.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is an overall view showing a use state, FIG. 2 is a front view, FIG. 3 is a partial sectional side view, and FIG. 5 and 6 are schematic diagrams for explaining the method of use and the operation. 1 ... Handle bar, 2 ... Rotary blade, 2a ... Front side surface (of rotary blade), 10 ... First guide section, 13 ... Second guide section, A
...... Quarter part (of rotary blade), P …… Plane almost parallel to the rod

Claims (1)

[Claims] 1. A rotary blade, which is substantially parallel to the handle rod, is attached to the tip of the handle rod so that the attachment member does not protrude from the front side face of the handle, while the rotary blade is attached to the front side face of the rotary blade. Located in a substantially coincident plane and at a slight distance in the radial direction with respect to the outer peripheral edge which leaves approximately a quarter portion corresponding to the lower half of either one of the right and left of the handle rod of the rotary blade. One guide part and below the rotary blade,
It is located in a plane that roughly matches the front side of the rotary blade, and
A pruning machine comprising a second guide portion extending in substantially the same direction as the handle rod.