JP3510087B2 - Pruning machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pruning machine for cutting a branch of a standing tree by a rotary blade arranged at the tip of an operating rod, and more specifically, guiding a branch to a rotary blade by sandwiching the branch. The present invention relates to a pruning machine provided with a U-shaped guide.

[0002]

2. Description of the Related Art For example, in a pruning machine for cutting or trimming branches at high places such as street trees and garden trees, a small air-cooled two-cycle gasoline arranged at one end (base end) of an operating rod. The output from a power source such as an engine is transmitted via a power transmission device to a reciprocating or rotating saw blade located at the other end (tip) of the operating rod, and this saw blade is driven to perform pruning. It is designed to (cut off branches).

Further, in the case of using a rotary saw blade, a pruning machine provided with a roughly U-shaped guide portion for guiding a branch on the rotary blade portion side of the rotary blade is, for example, the applicant of the present invention. Japanese Utility Model Registration No. 2521088 which is related to the above-mentioned application. However, in such a pruning machine, U
The width of the front of the letter-shaped guide is too large to firmly fix the branches, which may cause chattering and vibration when cutting the branches, which may cause numbness of the hands and fingers, or work efficiency and stability. There was a problem of lowering.

Further, when attempting to cut a thick branch having a diameter that does not fit in the frontage of the guide portion, it may be possible to cut only halfway. In this case, the branches do not fall while being damaged, so the posture must be changed and the trailing cut must be performed from the opposite direction. However, in reality, there are many cases where the pruning machine cannot be entered due to overlapping or dense branches, and it is impossible to pruning work by changing the posture due to the topography, and complete pruning work is difficult. There was also the problem that
Furthermore, if you cut a branch that is too large,
There is also a problem that the pruning machine is damaged by exceeding the limit cutting force corresponding to the output of the engine.

In order to solve the problems in the conventional pruning machine as described above, the applicant of the present invention has previously proposed a pruning machine 100 whose main part is shown in FIG. 6 ( See Japanese Utility Model Laid-Open No. 6-64432).

The pruning machine 100 shown in the drawing has a gear box 2 attached to the tip of an operating rod 1 into which a transmission shaft 1a is inserted.
A pair of rotary blade covers 3A, 3B are fixed to the lower surface of the. The rotary blade covers 3A and 3B each have an approximately half-dish shape and are vertically joined to each other to open the front surface on the cutting work side. The hollow inside thereof is concentric with the disk and has a sawtooth shape around it. A rotary blade 7 having a blade portion 7a is rotatably attached. A bevel gear device (not shown) is arranged in the gear box 2, and is transmitted by the transmission shaft 1a from a power source such as a small internal combustion engine (not shown) provided at the base end of the operating rod 1. The rotary driving force rotates the rotary blade 7 via the bevel gear device.

Of the pair of rotary blade covers 3A and 3B, the rotary blade cover 3B (FIGS. 6A and 6B) located on the rear surface side of the rotary blade 7 when viewed from the operation rod 1 side. Is
An appropriate sawdust discharge port 3a is formed, and a U-shaped guide 8 for guiding and holding the branch to be cut at the time of pruning to the blade portion 7a of the rotary blade 7 is provided on the back surface of the rotary blade 7. It is arranged close to the rotation plane 7A on the side. The U-shaped guide 8 is composed of a U-shaped portion 8A and a slide plate portion 8B integrally provided on the rear end side (bottom portion 8a side) of the U-shaped portion 8A.
With the slide plate portion 8B inserted in the hollow inside of the guide portion 6 fixed to the lower surface of the rotary blade cover 3B,
It is attached so as to be able to move back and forth in the front-back direction (vertical direction in the figure = the entire protruding direction including the rotary blade 7). Further, the slide plate portion 8B is always urged in the forward direction (upward direction in the drawing) by the tension coil spring 4 which is an urging means, so that the slide plate portion 8B is not in operation (FIGS. 6B and 6C). Is biased forward by the tension coil spring 4 so that the bottom portion 8a of the U-shaped portion 8A of the U-shaped guide 8 is located outside the tip of the blade portion 7a of the rotary blade 7. Being energized.

In the pruning machine 100, as shown in FIG. 6 (A), the frontal width X between the left and right projections of the U-shaped guide 8 (the space where the branch enters) is the maximum allowable cut. The branch diameter is made substantially equal, and the backward stroke of the U-shaped guide 8 is also made substantially equal to the front width X,
In a preferred mode, the depth Y of the U-shaped guide 8 is set to be 1.5 times or more of the frontage width X (Y ≧ 1.5X).

Next, the pruning operation by the pruning machine 100 will be described. Here, a case where the diameter of the branch to be cut is approximately the same as the frontage width X of the U-shaped guide 8 will be described as an example. In the pruning operation, first, the U-shaped portion 8A of the U-shaped guide 8 is brought close to an arbitrary portion of the branch T to be cut, and the branch T is sandwiched by the U-shaped portion 8A and slightly pushed up. The operating rod 1 (entire) is pushed up in the direction indicated by the arrow u in FIG. As a result, the bottom portion 8 of the U-shaped guide 8 is resisted against the biasing force of the tension coil spring 4.
As a is relatively pushed by the branch T, it retreats in the direction shown by the arrow v in FIG. 7, and the blade portion 7a of the rotary blade 7 bites into the branch T, and the branch T has a sawtooth cut K. Is formed. Then, when the operating rod 1 is further pushed up, the rotary blade 7 (the blade portion 7a of the rotary blade) traverses the branch T and completely cuts it, as shown in FIG. The branch T (the front end side) drops downward. After the cutting, the U-shaped guide 8 is advanced and returned to the original position by the urging force of the coil spring 4.

When the diameter of the branch is larger than the frontage width X of the U-shaped guide 8, that is, the maximum permissible cutting branch diameter, no matter how much the operating rod 1 is pushed up, the blade portion of the rotary blade 7 can be pushed up. Since 7a does not come into contact with the branch and cannot cut the branch, the pruning machine 100 cuts a branch that is thicker than X and cannot be completely cut in one pruning operation halfway. This prevents situations such as splitting branches. Also, it is possible to prevent the pruning machine from being damaged by exceeding the limit cutting force corresponding to the output of the engine when trying to cut a branch having a too large diameter.

[0011]

However, the pruning machine 100 as described above has the following problems. That is, at the time of sawing as shown in FIG. 7, the branch T cut halfway by the rotary blade 7.
The portion to be cut off from the sawing position (saw cutting edge K) hangs down by its own weight in the direction indicated by the white arrow g in FIG. 7 (B) (direction narrowing the gap of the saw cutting edge K). When the portion to be cut off is large and heavy, the rotary blade 7 is sandwiched and strongly clamped. For this reason, the rotation of the rotary blade 7 is hindered by the frictional force at the saw cut K, and the sawing operation cannot be performed smoothly. In extreme cases, the rotary blade 7 does not move and the sawing operation is further advanced. There was a problem that it could not be done.

If the sawing work cannot be carried out in the middle of the process, the branch T cannot be cut off, and the sawing work must be performed again from another direction, which is troublesome and inefficient. It was Further, when the rotary blade 7 is stuck in the saw cut K and becomes immobile, not only the saw operation cannot be advanced as described above, but also the rotary blade 7 is detached from the saw cut K. There was also the problem of being difficult.

The present invention has been made in view of the above problems of the conventional pruning machine, and the object thereof is to prevent a situation in which the rotary blade becomes stuck due to being caught in the saw cutting edge. (EN) Provided is a pruning machine that can be surely avoided, and that can be easily detached from the saw blade, so that the pruning operation can be performed efficiently and quickly. It is in.

[0014]

In order to achieve the above-mentioned object, the pruning machine according to the present invention is basically U along the protruding direction of the rotary blade arranged at the tip of the main operating rod. fitted around the auxiliary operating rod slidably in the main operating rod while retractably arranged a shaped guide, the U to the auxiliary operating rod
The main operation rod is connected in the protruding direction by connecting character-shaped guides.
It is characterized in that it is moved independently as a unit .

In a preferred embodiment of the pruning machine of the present invention, the U-shaped guide is connected and fixed to the auxiliary operating rod. It is also preferable that the U-shaped guide is biased by the biasing means so that the bottom of the U-shaped guide is located outside the tip of the blade of the rotary blade when not in operation. Can be mentioned.

Further, as another preferred embodiment, a transmission shaft is inserted into the main operating rod, and a gear box is attached to a tip end portion of the main operating rod to transmit the rotational driving force of the transmission shaft to the rotary blade. For example, the U-shaped guide may be arranged between the gear box and the rotary blade.

When performing the pruning operation with the pruning machine according to the present invention having such a structure, first, the bottom portion of the U-shaped guide is located outside the tip of the blade portion of the rotary blade. Do like this. Here, in a preferred mode, since the bottom portion of the U-shaped guide is biased by the biasing means so that the bottom portion of the U-shaped guide is located outside the rotary blade, no special operation is required. When the urging means is not provided, the auxiliary operation rod is slid forward to push or integrally move the U-shaped guide forward (protruding direction) of the rotary blade.

Next, the main operating rod is moved to bring the U-shaped portion of the U-shaped guide closer to an arbitrary portion of the branch to be cut off, and the U-shaped portion is used to sandwich the branch and push it up slightly. Push up the operating stick (whole). Thereby, in a preferred aspect, the bottom portion of the U-shaped guide is pushed against the branch against the urging force of the urging means, the U-shaped guide and the auxiliary operating rod are relatively retracted, and the branch is formed. The blade portion of the rotary blade bites into, and a sawtooth cut is formed in the branch.

At this time, in the branch cut halfway by the rotary blade, the portion to be cut off from the sawing position (saw cutting edge) to the tip (branch tip) side narrows the gap of the saw cutting edge by its own weight. Although it is going to hang down in the direction, the branch part which is going to hang down should be supported by the U-shaped guide and the auxiliary operation rod, that is, the main operation rod should be pushed up by, for example, the right hand. While performing the cutting work, for example, by holding the auxiliary operating rod in a stretched manner with the left hand so as not to retract, and pushing up the branch tip side of the branch to be cut, it is possible to prevent the gap of the saw cutting edge from shrinking, As a result, it is possible to avoid a situation where the rotary blade is caught in the sawtooth cut portion and does not move.

Then, when the main operating rod is further pushed up, the rotary blade (the blade portion of the rotary blade) traverses the branch and completely cuts it, and the cut branch (the tip end side) is moved downward. To fall. After the cutting, in a preferred mode, the U-shaped guide is advanced and returned to the original position by the urging force of the urging means.

In addition, for example, due to an erroneous operation such as retracting the U-shaped guide faster than the push-up speed of the main operating rod and the rotary blade, the rotary blade is caught in the saw cutting edge and cannot be moved. In this case, for example, by pushing up the auxiliary operating rod with the left hand to raise the branch portion to be cut off and widening the gap of the saw cut end, for example, by pulling down the main operating rod with the right hand, the rotary blade is cut with the saw blade. It can be easily removed from the cut.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a pruning machine according to the present invention, FIG. 2 is a plan view of a main part (working part) of the pruning machine shown in FIG. 1, and FIG. 3 is a plan view shown in FIG. It is sectional drawing of a part.

The pruning machine 10 of the illustrated embodiment has a main operating rod 12 made of a pipe, and an air-cooled two-cycle gasoline engine 15 as a power source is arranged at one end (base end) of the main operating rod 12. The sawing work unit 14 is provided at the other end (tip).

The engine 15 is attached to the main operating rod 12.
The transmission shaft 25 is inserted in order to transmit the power of the above to the working portion 14, the original grip 16 is externally fitted and fixed near the base end portion thereof, and the throttle trigger 17 for adjusting the output of the engine 15 is provided. An auxiliary operating rod 20 made of a pipe is externally fitted to an intermediate portion of the pipe so as to be slidable and retractable.

A front grip 21 is externally fitted and fixed to the rear end portion of the auxiliary operation rod 20, and the outer sleeve 2 is attached to the front end portion thereof.
2 is externally fitted and fixed, and a connector 60 for connecting and fixing the auxiliary operation rod 20 and a U-shaped guide 50 described later is externally fitted and fixed slightly behind the exterior sleeve 22.

The sawing work portion 14 is a disk-shaped rotary blade 30 having a saw-shaped blade portion 30a formed around the rotary blade 30, and the main blade for transmitting the rotational driving force of the transmission shaft 25 to the rotary blade 30. A gear box 32 attached to the tip of the operating rod 12; and a pair of rotary blade covers 33A and 33B fixed to the lower side (left side in FIG. 3) of the gear box 32, and the gear box 32. And the rotary blade 30
U to a position appropriately separated from the rotary blade 30 between
The letter-shaped guide 50 is arranged parallel to it.

A rotary shaft 40 is rotatably supported in the gear box 32 so as to be orthogonal to the transmission shaft 25. The rotary shaft 40 has an upper end side (a right end side in FIG. 3) outside the transmission shaft 25. Driven bevel gear 4 that meshes with drive bevel gear 41 that is fitted and fixed
2 is fitted and fixed by spline connection etc.,
A pair of upper and lower clamping pressure holding members 46 and 47 are externally fitted and fixed to the lower end side (the left end side in FIG. 3) by spline coupling or the like, and the rotary blade 30 is sandwiched between the clamping pressure holding members 46 and 47. Is fixed by a bolt 45 screwed from below the rotary shaft 40 and integrally fixed and held.

The pair of rotary blade covers 33A, 33B
Has a substantially dish shape for covering the rotary blades 30, respectively, and U-shaped notched opening portions 33a, 33b in a plan view are formed in the front center portion so as to be recessed from the front end toward the center. The rotary blade 30 is partially exposed at the notch openings 33a and 33b.

The U-shaped guide 50 arranged between the gear box 32 and the rotary blade 30 is basically the same as the U-shaped guide 7 shown in FIGS. 6 and 7. The U-shaped portion 51 and the slide plate portion 52 integrally formed on the rear end side (bottom portion 53 side) of the U-shaped portion 51 are integrally formed. An elongated hole 55 is formed in which 40 parts are loosely fitted. Further, both end edge portions of the U-shaped portion 51 of the U-shaped guide 50 are loosely engaged with a pair of guide portions 56, 56 having a U-shaped cross section disposed on the lower left and right front end portions of the rotary blade cover 33A. The U-shaped guide 50 is fitted with the slide plate portion 52 and is loosely fitted into a guide portion 57 having a rectangular cross-section with a rectangular cross section disposed on the lower surface of the rear half of the rotary blade cover 33A. Front-rear direction F of the main operating rod 12 (vertical direction in the figure = the entire protruding direction including the rotary blade 30)
It can slide back and forth along.

Further, the rear end portion of the slide plate portion 52 of the U-shaped guide 50 is connected and fixed to a connecting member 60 which is externally fitted and fixed near the tip end portion of the auxiliary operating rod 20, and the auxiliary member It is adapted to move integrally with the operating rod 20.

In addition to the above, in the present embodiment, a tension coil spring 65 is interposed between the rotary blade cover 33A and the connecting tool 60, and the tension coil spring 65 is provided.
Therefore, when not working (the state shown in FIGS. 1 to 3),
The bottom portion 53 of the U-shaped guide 50 is constantly biased so as to be located in the front (outer) position with respect to the tip of the blade portion 30a of the rotary blade 30.

When performing the pruning operation by the pruning machine 10 of the present embodiment having the above-mentioned configuration,
As will be understood by referring to FIGS. 4 and 5 in addition to FIG. 3, first, the main operating rod 12 is moved to move the U-shaped guide 5.
The U-shaped portion 51 of 0 is brought close to an arbitrary portion of the branch T to be cut off. In this case, the U-shaped guide 50 has the bottom portion 53 of the rotary blade 3 due to the tension coil spring 65.
The U-shaped guide 50 is brought close to the branch T as it is because the pressure is biased so as to be located outward of the blade portion 30a of 0. Subsequently, the main operating rod 12 (whole) is pushed up in the direction indicated by the arrow u in FIG. 5 so as to slightly push up the branch T with the U-shaped portion 51. As a result, the U is resisted against the urging force of the tension coil spring 65.
The bottom portion 53 of the character-shaped guide 50 is pushed by the branch T,
The character-shaped guide 50 and the auxiliary operation rod 20 relatively retract in the direction indicated by the arrow v in FIG. 5, and the blade portion 30a of the rotary blade 30 bites into the branch T, and the branch T
A saw cut K is formed at the.

At this time, in the branch T cut halfway by the rotary blade 30, the portion to be cut off from the sawing position (saw cutting edge K) to the tip (branch tip) side is white due to its own weight in FIG. Although it is going to hang down in the direction indicated by the withdrawal arrow g, that is, in the direction to narrow the gap of the sawtooth cut K, the branch portion which is going to hang down is passed through the U-shaped guide 50 and the auxiliary operation rod 20. Support, that is, while performing the sawing operation by pushing up the main operating rod 12 with, for example, the right hand, the auxiliary operating rod 20
For example, by holding it by hand with the left hand so as not to retract it, it is possible to prevent the gap of the saw cutting edge K from being narrowed, and as a result, the rotary blade 30 is caught in the saw cutting edge K and does not move. The situation that would happen is avoided.

Then, when the main operating rod 12 is further pushed up, the rotary blade 30 (the blade portion 30a of the rotary blade) traverses the branch T and completely cuts the branch T (the branch of the branch T). The front side) falls downward. After the cutting, the U-shaped guide 50 is advanced and returned to the original position by the urging force of the tension coil spring 65.

Further, for example, the rotary blade 30 is caught in the sawtooth cut K by an erroneous operation such as retracting the U-shaped guide 50 faster than the push-up speed of the main operating rod 12 and the rotary blade 30. When it does not move, for example, by pushing up the auxiliary operation rod 20 with the left hand to raise the branch portion to be cut off, widening the gap of the saw cut K, and by pulling down the main operation rod 12 with the right hand, for example. The rotary blade 30 can be easily removed from the saw cut K.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-mentioned embodiment, and is designed within the scope not departing from the spirit of the invention described in the claims. In, various changes can be made.

For example, in the above embodiment, the U
The character-shaped guide 50 and the auxiliary operation rod 20 are connected and fixed to be integrally moved forward and backward, but it is not always necessary to do so, and they are not connected and fixed.
The U-shaped guide 50 may be pushed in the protruding direction by the auxiliary operation rod 20.

Further, the tension coil spring 65 (biasing means) is not always necessary, and as described above, the auxiliary operation rod 20 pushes up the U-shaped guide 50 to a predetermined position during the sawing operation. Good. Further, as the biasing means, instead of the tension coil spring 65, for example, a compression coil spring is externally fitted to the main operation rod 12 on the rear end side of the auxiliary operation rod 20 so as to push up the auxiliary operation rod 20. You may employ the method of doing.

[0039]

As can be understood from the above description, according to the pruning machine of the present invention, it is possible to surely avoid the situation where the rotary blade is caught in the saw cutting edge and becomes immobile. The rotary blade can be easily detached from the saw cut end, and therefore, an excellent effect that the pruning operation can be efficiently and promptly obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a pruning machine according to the present invention.

FIG. 2 is a plan view of a main part (working part) of the pruning machine shown in FIG.

FIG. 3 is a sectional view of a main part shown in FIG.

FIG. 4 is a plan view of a main part used for explanation at the time of sawing.

FIG. 5 is a cross-sectional view of a main part used for explanation at the time of sawing.

6A and 6B show essential parts of a conventional pruning machine, FIG. 6A is a plan view showing the completion of sawing, and FIG. 6B is a plan view showing a non-working time;
(C) is a side view showing a non-working state.

7A and 7B show a conventional pruning machine when sawing, FIG. 7A is a plan view of a main part, and FIG. 7B is a side view of the main part.

[Explanation of symbols]

10 pruner 12 Main operating rod 20 Auxiliary operation rod 25 transmission shaft 30 rotary blades 30a blade 32 gearbox 50 U-shaped guide 53 bottom 65 Extension coil spring (biasing means) F Projection direction (front side)

Claims (4)

(57) [Claims] 1. A U-shaped guide (50) is arranged so as to be movable back and forth along a protruding direction (F) of a rotary blade (30) arranged at the tip of a main operation rod (12), and the main operation is also performed. The auxiliary operation rod (20) is slidably fitted onto the rod (12), and the U-shaped guide (5) is attached to the auxiliary operation rod (20).
0) to connect the main operating rod in the protruding direction (F).
A pruning machine characterized by being moved integrally with (12) independently . 2. The pruning machine according to claim 1, wherein the U-shaped guide (50) is connected and fixed to the auxiliary operation rod (20). 3. The U-shaped guide (50) when not in operation
The bottom part (53) of the blade is the blade part (30a) of the rotary blade (30).
The pruning machine according to claim 1 or 2, wherein the U-shaped guide (50) is biased by a biasing means (65) so that the U-shaped guide (50) is located outside the tip of the pruner. 4. A transmission shaft (25) on the main operating rod (12).
Is inserted, and a gear box (32) is attached to the tip of the main operating rod (12) to transmit the rotational driving force of the transmission shaft (25) to the rotary blade (30). ) And the rotary blade (30), the U-shaped guide (50) is arranged between the rotary blade (30) and the rotary blade (30).