JP2003259745A - Tree pruner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tree pruner having light weight, small size and improved balance to improve the pruning workability by simplifying the driving means for reciprocating a saw of the pruning part. <P>SOLUTION: The blade 43 attached to the tip end of an operation pipe 33 is forwarded by a spring 57 inserted into a power-transmission member 50 and applying a pulling force F toward the blade side. A flexible wire Y of a transmission member 50 is guided to a driving means 61 of a power driving part 60 by a pair of guide rollers 80, 81 and change the direction to be hooked on a pulley 73. An end Y2 of the wire Y is fixed to an eccentric shaft 71 of an eccentric rotor 70 of a driving source. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pruning machine for pruning branches, stems, leaves, etc. at a high place of a tree by a worker standing on the surface of the ground, and particularly, to reduce the weight and size of a power drive unit. The present invention relates to a high pruning machine with improved workability.

[0002]

2. Description of the Related Art Conventionally, there has been provided a high-branch reaper for cutting branches, stems, leaves, etc. at a high place of a tree by a hand of an operator standing on the ground surface. This high pruning machine is widely used for general household use, forestry, and street tree pruning.

As shown in FIG. 8, the structure of the above-mentioned conventional high-branch-cutting machine is such that the power drive unit 1 used by a worker M on his back (sometimes held on his shoulder or held in his hand), and An operation unit 3 which is an operation tube or an operation rod that is held in a hand and operated,
The cutting unit 5 is provided at the tip of the operation unit 1 and cuts branches, stems, leaves, and the like, and the "hedge trimmer (hair clipper blade) 10, the chain saw 13, or the rotary cutter 15 provided in the cutting unit, The power source of the power drive unit 1 and the cutting unit 5 are driven by a power transmission member 17 inserted in the operation unit 3.

The detailed structure of the reaping section 5 is shown in FIG. First, as shown in FIG. 9 (a), the “hedge trimmer (hair clipper blade) 10 is a gear box that converts the rotational movement of the power transmission member 17 inserted into the operation portion 3 into the rotational movement in the orthogonal direction. G1 is provided at the tip of the operation portion 3. This gear box G1 is provided with a bevel gear B1 provided at the tip of the power transmission member 17, a bevel gear B2 that meshes at a right angle with the bevel gear B1, and a bottom surface of the bevel gear B2. One end of the crank rod K is pivotally supported on the pin P attached with care, and the other end is pivotally connected to the forward / backward moving blade 10A of the pair of clipper blades 10 including the forward / backward moving blade 10A and the fixed blade 10B. The rotational movement of the power transmission member 17 is converted into the forward / backward movement of the forward / backward moving blade 10A.

Further, the chain saw 13 is, as shown in FIG. 9B, a power transmission member 17 inserted into the inside of the operation portion 3.
Gear that transforms the rotational motion of the rotor into the rotational motion in the orthogonal direction
The box G2 is provided at the tip of the operation unit 3. The gear box G2 includes a bevel gear B1 provided at the tip of the power transmission member 17 and a bevel gear B2 that meshes at right angles with the bevel gear B1.
And a sprocket S attached to the outer surface of the bevel gear B2. The sprocket S is engaged with the base end side of a chain saw 20 that is hung around a support 19 that extends long forward. As a result, the rotational movement of the power transmission member 17 is converted into the circular movement of the chain saw 20.

Further, as shown in FIG. 9 (c), the rotary cutter 15 has a power transmission member 1 inserted through the inside of the operation portion 3.
A gear box G3 is provided at the tip of the operation unit 3 for converting the rotational movement of the No. 7 into the rotational movement in the orthogonal direction. The gear box G3 includes a bevel gear B1 provided at the tip of the power transmission member 17 and a bevel gear B2 meshed with the bevel gear B1.
And the rotary blade 23 connected to the lower surface of this bevel gear B2
Consists of. As a result, the rotary motion of the power transmission member 17 is converted into the rotary motion in the direction orthogonal to the rotary motion, and the rotary blade 2
3 is rotationally driven.

The hedge trimmer "hair clipper blade" 10 provided in the reaping section 5 needs a member for converting the rotary motion into the reciprocating motion, and thus the size increase is inevitable, and the chain saw 13 and the rotary cutter 15 are relatively heavy. In many cases, the gear boxes G1, G2, G3 for converting and driving them also have a considerably heavy weight. Moreover, when the actual high-branch mowing work is performed, since the mowing unit 5 is provided at the tip of the long operation unit 3, a large load is applied to the hand of the operator. For this reason, there is a problem that it becomes a considerable amount of hard work.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the above-mentioned conventional high-branch mowing machine, and particularly, the drive means for driving the saw blade of the mowing section forward and backward is simply configured. In order to reduce weight, size, and balance,
It is an object of the present invention to provide a high-branch reaper having improved operability.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a high branch reaper according to claim 1 comprises an operating portion having an operating pipe or an operating rod having a predetermined length,
Power consisting of a mowing part having a saw blade attached to the tip side of the operating part so as to be able to move forward and backward, and a drive means connected to a drive source provided at the base end side of the operating part to move the saw blade forward and backward. In a high branch mowing machine comprising a drive unit and a power transmission member arranged in the operation unit and connecting the drive unit and the saw blade, the drive unit of the power drive unit is arranged in an extension direction of the operation unit. An eccentric rotating body that is provided on the same axis as the rotating shaft of the drive source and that changes the rotational movement of the drive source into eccentric rotation, and is pivotally supported at a position that is offset in parallel to the axis of the rotating shaft of the eccentric rotating body. A pulley and a guide roller pivotally supported at a position orthogonal to the direction of the axis of rotation, wherein the power transmission member is a rope or wire of a power transmission member whose end is fixed to the eccentric shaft of the eccentric rotating body. As well as operating it through the guide rollers. The power transmission member in the operating portion is provided with an elastic body that exerts a pulling force on the saw blade side of the mowing portion to move the saw blade forward. To do.

According to a second aspect of the present invention, there is provided a high branch mowing machine according to the first aspect, in which the cutting portion for holding the saw blade is divided into a tip side and a base side, and the both are bendably connected. In addition, the swing angle of the saw blade is adjustable.

[0011]

According to the high-branch reaper according to claim 1 of the present invention,
The saw blade provided on the tip side of the operation tube or the operation rod is a rope or wire of a power transmission member that has an elastic body that exerts a tensile force to the saw blade side to move the saw blade forward. Of the eccentric rotating body provided on the same axis as the rotation axis of the drive source arranged in the extension direction of the operating portion while being guided by the guide roller with respect to the driving means to change the direction and be wound around the pulley. The eccentric shaft portion is fixed at its end portion to simplify the construction. As a result, the saw blade is smoothly moved forward and backward by the cooperative action of the driving means for retreating and the elastic body for advancing, and branches, stems, leaves, etc. at high places of the tree can be reliably cut and cut.

That is, according to the above high-branch-mowing machine, the saw blade is moved forward by the elastic force of the elastic body interposed in the rope or wire of the power transmission member, guided by the guide roller, changed in direction, and wound around the pulley. By the driving means, the rope or wire is moved backward and forward by the sawing operation, and the forward and backward driving is performed lightly. As a result, the weight of the power drive and the whole is reduced.
In addition to downsizing, the axis of the rotary shaft of the motor coincides with the axis of the operation tube to improve the balance, and the pruning work at high places can be reliably performed.

According to a second aspect of the present invention, the cutting portion for holding the saw blade is divided into a tip side and a base side, and the both are bendably connected so that the swing angle of the saw blade can be adjusted. Since the blade is formed, the direction of the saw blade can be raised or laid down according to the thickness of the branch, and the high branch can be mowed with the optimum mowing angle, and the mowing workability can be further improved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A high pruning machine of the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is an overall perspective view of a high-pruning mower, FIG. 2 is a sectional view, and FIGS. 3 and 4 are a side sectional view and a front sectional view of a power drive unit. FIG. 5 is an external view of a state of use, FIG. 6 is an action diagram when thick pruning is cut, and FIG. 7 is an action diagram when thin pruning is cut.

A high pruning machine 100 according to an embodiment of the present invention.
Will be described with reference to FIG. 1 and FIG. First, the operation unit 30 includes an operation tube (or an operation rod) 33 having a predetermined length that can be held in a hand and operated. This operation tube 33
To the tip side 33A of the operation unit 30 that becomes, a cutting unit 40 having a saw blade 43 capable of advancing and retracting is attached. The cutting section 40 is inserted and attached to the inside 33C of the tube on the tip side 33A of the operation section 30 by inserting the holder 39 having a circular cross section into the inside 33C of the tube and screwing the groove 39A recessed in the lower surface to the lower surface of the operation tube 33. The saw blade 43 is slidable only in the forward / backward direction X in the axial direction by engaging the tip of the screw body 37.

The holding body 39 is provided with a long groove 39C which is vertically cut into the support body 39B on the front end side. On the tip side of the long groove 39C, a female screw 39D screwed in a direction orthogonal to the longitudinal direction of the holding body 39 and a counterbore hole 39.
E is open. The saw blade 43 has a counterbore hole 39E.
A support hole 43A on the base side of the saw blade 43 is fitted into a screw body 41 screwed in from the side, and is pivotally supported so as to be swingable. Further, on the base end side of the long groove 39C, a female screw 39F and a counterbore hole 39G are provided.
Is provided, and the fixed body 47 is pivotally supported by the support hole 47A on the screw body 45 screwed from the counterbore hole 39G side.

The convex portion 47B of the fixed body 47 is
It is engaged with a recess 43B provided at the tail end of the saw blade 43.
With this, the saw blade 43 can be manually swung with the two screw bodies 41 and 45 loosened, and the two screw bodies 4 and 45 can be swung.
By tightening 1, 45, the saw blade 43 is fixed at an angle in an arbitrary direction. That is, in the fixed body 47 of the mowing unit 40 that holds the saw blade 43, the cutting body is divided into a tip side and a base side, and both are bendably connected to each other to form the saw blade 4
The swing angle of 3 is adjustable.

Inside the pipe 33 on the tip side 33A of the operating portion 30.
A tip end of a shaft rod 51 serving as a power transmission member 50 is screwed to the rear surface side of the holding body 39 arranged in C with their axes aligned. Further, a cylindrical fixed seat 53 is inserted into the tip end side of the shaft rod 51, and the fixed crush 53 is fixed at an arbitrary position in the operation pipe 33 by a set screw 55. The shaft rod 51
A tension elastic body (a spiral spring) 57 is loosely wound around the front end of the fixed elastic body 57, and the tip end side 57A of the tension elastic body 57 is connected to the back surface of the fixed seat 53 by a set screw 59. Also,
The rear end side 57B of the tensile elastic body 57 is connected to the rear end 51 of the shaft rod 51.
It is locked to a stop seat 51B that is bulged on A and is fastened with a nut N. At the center position of the rear end 51A of the shaft rod 51, a lightweight and flexible wire Y1 such as a flexible wire Y or a rope is attached. This flexible wire Y
Is guided to the base end side (rear end or proximal side) in the operation pipe 33, and is connected to the drive means 61 of the power drive unit 60 arranged here. With this, the mowing unit 40 equipped with the saw blade 43
Is connected to a motor M (small motor or battery motor) as a drive source or a small engine to move the saw blade 43 forward and backward.

The driving means 61 for pulling the flexible wire Y or the rope is constructed as shown in FIGS. First, at the base end 33E of the operation tube 33, the cylindrical body 6
3 is fixed by fastening means (not shown), and a casing 65 is fixed by fastening means (not shown) on the back side. The housing H1 of the motor M is fitted to the rear end 65A of the casing 65, and is fixed by a set screw 67. Thus, the rotary shaft 69 of the motor M is arranged such that the axial center direction X1 thereof coincides with the axial center direction X0 of the operation tube 33,
The overall weight balance of the high pruning machine 100 is improved, and the workability when the operator holds it in his / her hand is improved. An eccentric rotating body 70 that changes this rotational movement into eccentric rotation is attached to the rotating shaft 69 of the motor M, and the eccentric shaft portion 71 is parallel to the axial center direction X1 that is the rotation center of the eccentric rotating body 70. Is pivoted to. In addition, a balancer 70A is provided at a position facing the eccentric shaft portion 71 with the center of rotation of the eccentric rotating body 70 interposed therebetween to absorb vibration. Further, a pulley 73 arranged below the eccentric shaft portion 71 is pivotally supported in a bulging space S1 provided below the casing 65 in a position parallel to the axial direction X1 and displaced downward. The pulley 73 is a support shaft 75.
It is rotatably supported via a bearing (needle bearing) 77 fitted in the. Further, in the space above the extension of the rotation center of the eccentric rotating body 70, the pair of guide rollers 8
Nos. 0 and 81 are rotatably provided in a vertical position and are pivotally supported in a direction orthogonal to the axial direction X1. In the pivotal support structure of the pair of guide rollers 80, 81, the shaft portions 80A, 81A are rotatably supported by the support body 91 fitted to the inner surface of the annular body 90 fixed in the casing 65. Note that the guide roller 81 alone functions. A partition plate 83 is arranged at the proximal end of the operation tube 33 near the pair of guide rollers 80, 81. A vertically long guide hole 83A is provided at the center of the partition plate 83,
It is opened close to the pair of guide rollers 80, 81.

Therefore, the flexible wire Y
Through the guide hole 83A, the upper surface of the guide roller 80 is pulled downward to change the direction, and the pulley 7 arranged below this is changed.
A through hole 7 formed by opening the end portion Y2 of the eccentric rotating body 70, which is pulled up right above while being hung around
It is fixed by inserting it into 1A and fastening it with a set screw 71B via a hard ball B. The end Y2 is a hard ball B
Since it is fastened by the set screw 71B via the wire, the wire is not damaged and is hard to come off.

With the above structure, the flexible wire Y
Has its end portion Y2 fixed to the eccentric shaft portion 71 of the eccentric rotating body 70 of the power transmission member.
Alternatively, the rope is hung around the pulley 73 and the direction of the rope is converted into the operation portion 30 and pulled out through the pair of guide rollers 80 and 81. The power transmission member 50 in the operation section 30 is provided with a tension elastic body (a spiral spring) 57 that exerts a tensile force F on the saw blade 43 side of the cutting section 40 to move the saw blade forward. Has been done. Incidentally, this may be a compression coil spring.

As a result, when the eccentric rotating body 70 is driven to rotate, the flexible wire Y or the rope attached to the eccentric shaft portion 71 having the radius of rotation r is located in a half-rotation area from the lower end position to the upper end position. In the solid line arrow, the reaping unit 40 is moved backward in the direction of the solid line arrow by the stroke S. By this backward movement, the tension elastic body (helix spring) 57 is moved to the position shown in FIG.
The tension force F toward the saw blade 43 side is stored by stretching as shown in FIG. Then, the flexible wire Y or the rope loosens at the broken line arrow in the half-rotation area from the upper end position to the lower end position of the eccentric shaft portion 71. Due to this slack, the flexible wire Y and the cutting portion 40 are caused by the tensile force (contractile force) F to the saw blade 43 side stored in the tensile elastic body (helix spring) 57.
Is moved forward by a stroke S in the direction of the broken arrow. The saw blade 43 is moved back and forth by the forward and backward movements.

According to the high branch mowing machine 100 of the present invention, the saw blade 43 provided on the tip side of the operation tube 33 exerts a pulling force F to the saw blade side by the activation of the motor M and advances the saw blade 43. The wire Y of the power transmission member 50 having a moving elastic tension member (a spiral spring) 57 is guided by the pair of guide rollers 80 and 81 with respect to the driving means 61 of the power driving unit 60 and the direction thereof is changed. It is configured such that the end portion Y2 is fixed to the eccentric shaft portion 71 of the eccentric rotating body 70 of the drive source while being wound around the pulley 73. As a result, the saw blade 43 is smoothly moved forward and backward by the cooperative action of the driving means 61 for backward movement and the tensile elastic body 57 for forward movement.

Therefore, as shown in FIG.
00 can be held in a well-balanced hand when used by an operator. The main body can also be held by a worker by shouldering it with a band, etc.
Can easily and reliably cut branches, stems, leaves, etc. at high places. That is, according to the above high-pruning mower 100, the power drive unit 60 and the whole are reduced in weight and size, and the axial direction X1 of the rotary shaft 69 of the motor M coincides with the axial direction X0 of the operation tube 33. Since the balance is improved,
You can surely do the pruning work at high places.

In addition, a tensile elastic body (a spiral spring) 57
Is stretched when the saw blade 43 moves backward to store a tensile force (contractile force) F, and when the saw blade advances, the tensile force (contractile force) F is stored.
As a result, the saw blade 43 is moved forward, so that there is a smooth force action both when pulling and when pulling back, and the force and vibration noise applied to the motor can be reduced.

A concrete mowing operation of the above high branch mowing machine 100 is shown in FIGS. 6 and 7. First, in the case of the thick branch K1, as shown in FIG. 6, the saw blade 43 is moved forward and backward with respect to the thick branch K1 by bending the tip end side downward and pressing from the upper side. Due to this forward / backward movement, the saw blade 43 does not press strongly against the thick branch and does not become an unstable posture, and the thick branch K1
Is reliably disconnected. Next, the cutting operation of the thin branch K2 and the leaf H is performed as shown in FIG. Saw blade 43
Is extended in the axial direction of the operation tube 33. As a result, the saw blade 43 does not become an unstable state in which the thin branch K2 or the leaf H is lightly pressed to pull the thin branch K2 or the leaf H, and the thin branch K2 or the leaf H is reliably cut. .

That is, the mowing section 40 that holds the saw blade 43.
At the tip side and the base side, the saw blade 43 is formed separately, and the two are flexibly connected to each other so that the swing angle of the saw blade 43 can be adjusted. It is possible to stand up and lie down, and it is possible to mow high branches with the optimum mowing angle, and it is possible to further improve mowing workability.

The present invention is not limited to the above embodiment, and any appropriate design changes can be made. For example, the operation unit 3
Although 0 is composed of an operation tube, it may be an operation rod. When the operation rod is used, the power transmission member 50 may be arranged along the outside of the operation rod. Further, the operation unit 30 may be formed of a stretchable tube material.

[0029]

According to the first aspect of the present invention, the saw blade is returned by the elasticity of the elastic body interposed in the power transmission member, is guided by the pair of guide rollers to change its direction, and is driven around the pulley. The forward / backward drive that is sawed by can be done lightly. As a result, the weight and size of the motor can be reduced, and the axis of the rotary shaft of the motor can be aligned with the axis of the operation tube to improve the balance, and the pruning work at high places can be reliably performed.

According to a second aspect of the present invention, the cutting portion for holding the saw blade is divided into a tip side and a base side, and both are bendably connected so that the swing angle of the saw blade can be adjusted. Therefore, the direction of the saw blade can be raised or laid down according to the thickness of the branches, and the high branches can be mowed by the optimum mowing angle, and the mowing workability can be further improved.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a high branch mowing machine showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the high branch mowing machine showing the embodiment of the present invention.

FIG. 3 is a side cross-sectional view of the power drive unit according to the embodiment of the present invention.

FIG. 4 is a front sectional view of the power drive section taken along the line AA in FIG.

FIG. 5 is an external view showing a usage state of the high branch mowing machine of the present invention.

FIG. 6 shows an embodiment of the present invention and is an operation diagram at the time of cutting thick branches.

FIG. 7 is a view showing an embodiment of the present invention and is an operation diagram at the time of cutting a fine twig.

FIG. 8 is an external view showing a usage state of a conventional high-branch mowing machine.

FIG. 9 is a perspective view showing a main part of a conventional high branch mowing machine.

[Explanation of symbols]

30 operation part 33 operation pipe 39 holding body 39B support 39C long groove 39D female screw 39E counterbore hole 39G counterbore hole 40 reaping part 41, 45 screw body 43 saw blade 43A support hole 47 fixed body 47A support hole 47B convex portion 50 power transmission Member 51 Shaft 51B Stop seat 53 Fixed seats 55, 59 Set screw 57 Tensile elastic body (spiral spring) 60 Power drive unit 61 Drive means 65 Casing 70 Eccentric rotor 71 Eccentric shaft 73 Pulley 77 Bearing 80, 81 Guide roller 83 Partition wall 83A Guide hole 90 Annular body 91 Support body F Tensile force K1 Thick branch K2 Thin branch H Leaf N Nut S Stroke r Turning radius S1 Expansion space X1, X0 Axial direction Y Flexible wire Y1 Wire rod Y2 End 100 High branch Reaper

Claims (2)

[Claims] 1. An operating section comprising an operating tube or operating rod having a predetermined length, a cutting section provided with a saw blade attached to the distal end side of the operating section so as to be able to move forward and backward, and a proximal end side of the operating section. A power source drive unit that is connected to a drive source for moving the saw blade forward and backward, and a power transmission member that is disposed in the operation unit and connects the drive unit and the saw blade. In the above high-pruning mower, the drive means of the power drive section is provided on the same axis as the rotation axis of the drive source arranged in the extension direction of the operating section, and is an eccentric rotor for changing the rotational motion of the drive source into eccentric rotation. And a pulley that is pivotally supported at a position that is parallel and offset to the direction of the axis of rotation of the eccentric rotating body, and a guide roller that is pivotally supported at a position that is orthogonal to the direction of the axis of rotation.
The power transmission member is arranged such that a rope or a wire of the power transmission member, the end portion of which is fixed to the eccentric shaft of the eccentric rotating body, is wound around the pulley and the direction of the power transmission member is changed into the operation portion through the guide roller. The high-pruning mower is characterized in that an elastic body for exerting a pulling force on the saw blade side of the mowing portion to move the saw blade forward is interposed in the power transmission member of. 2. A cutting part for holding the saw blade is divided into a tip side and a base side, which are bendably connected to each other so that the swing angle of the saw blade can be adjusted. The high-pruner according to claim 1, which is characterized in that.