JP2003250342A - Pruning apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pruning apparatus including a pair of upper and lower holding plates disposed against each other with a basal part fixed on the main body, a pair of upper and lower cutting blades held between both the holding plates and working for cutting action by mutual sliding of the blade parts through differential reciprocating motion, at least one of them being mobile, and an intermediate material interposed between both the cutting blades, and capable of preventing wear due to the planar contact between the cutting blades and the intermediate material and motional load increase. <P>SOLUTION: The pruning apparatus is characterized by that the intermediate material 3 is provided with a point contact part subject to point contact with the respective surfaces of the mobile cutting blades 2a and 2b. <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 pruning device used for pruning and mowing trees such as garden trees.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, as a pruning device, a pair of upper and lower holding plates 1a and 1b having a base fixed to a main body and arranged to face each other, and a comb-shaped blade have both holding plates. 1a,
A pair of upper and lower cutting blades 2a, 2b which are held between 1b and reciprocally move differentially to rub the blade portions to perform a cutting action, and between the cutting blades 2a, 2b. It has been proposed to provide an intermediate member 3 that shields the bases of the upper and lower cutting blades 2 from contacting each other. As the intermediate material 3, for example, a material that is softer than the cutting edge 2 such as a resin material, is formed into a plate shape, and has a rear end portion fixed to the rear end portion of the lower holding plate 1b. . A gap is formed between the surface of the intermediate member 3 and the surfaces of the upper and lower cutting blades 2a and 2b, and the cutting blade 2 and the intermediate member 3 are moved when the cutting blade 2 reciprocates.
I try not to move while and are always in contact. Further, even if the cutting blade 2 moves up and down during reciprocating motion and comes into contact with the intermediate material 3, since the intermediate material 3 is softer than the cutting blade 2, wear and chipping of the cutting blade 2 is prevented. ing.

[0003]

However, in the above-mentioned conventional trimming device, the cutting edge and the intermediate material come into surface contact with each other depending on variations in the parts precision and the assembly accuracy of the cutting edge and the intermediate material, resulting in a large sliding resistance. As a result, abrasion or increase in exercise load may occur, the vertical movement of the cutting blade may increase, the upper and lower cutting blades may come into contact with each other, or the cutting blade may come off the holding mechanism.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make surface contact between a cutting blade and an intermediate member even if there is a variation in the component accuracy or assembly accuracy of the cutting blade or the intermediate member. An object of the present invention is to provide a pruning device capable of preventing abrasion and an increase in exercise load due to, and preventing contact between upper and lower cutting blades due to vertical movement of the cutting blade and disengagement from a holding mechanism.

[0005]

The invention according to claim 1 is
It has a pair of upper and lower holding plates with the base fixed to the main body and facing each other, and a comb-shaped blade, and is held between both holding plates and differentially reciprocates to rub the blades and cut. A pair of upper and lower cutting blades, at least one of which is movable, and an intermediate material that is interposed between both cutting blades and shields the bases of the upper and lower cutting blades from contact with each other. It is characterized in that a point contact portion that comes into point contact with the surface of the movable cutting edge is provided.

In such a pruning device, since the intermediate material is provided with the point contact portion which makes point contact with the surface of the movable cutting blade, the point movement portion of the intermediate material reciprocates in the state of point contact with the surface of the movable cutting blade. The sliding resistance of the cutting blade is reduced, and the point contact portion supports the cutting blade to prevent the cutting blade from moving up and down.

According to a second aspect of the present invention, in the first aspect of the invention, there is provided a plate member having a through hole and fixed to the base side, and a plate member interposed in the through hole of the plate member. The intermediate member is formed by an interposing member having an end portion of the protruding portion protruding from the surface as a point contact portion.

In such a trimming device, since the protruding portion of the interposing member interposed in the through hole of the plate member serves as the point contact portion of the intermediate member, the movable cutting blade is in point contact with the protruding portion. It is sliding.

The invention according to claim 3 is characterized in that, in the invention according to claim 2, the interposition member is formed in a spherical shape rotatable in the through hole.

In such a trimming device, since the interposition member is formed into a spherical shape that can rotate within the through hole, when the movable cutting edge slides in point contact with the protruding portion of the spherical interposition member. In addition, the interposition member rotates within the through hole, and wear of the movable cutting edge and the interposition member can be further reduced.

The invention according to claim 4 is characterized in that, in the invention according to claims 1 to 3, the point contact portions are arranged in parallel in the reciprocating direction of the cutting blade.

In such a pruning device, since the point contact portions are arranged in parallel in the reciprocating direction of the cutting blade, the movable cutting blade slides in point contact with the plurality of point contact portions to reciprocate the movable cutting blade. Is stable and has a low load. Further, the contact pressure between the movable cutting edge and the interposed member is dispersed to further reduce the wear of the movable cutting edge and the point contact portion.

The invention according to claim 5 is characterized in that, in the invention according to claim 1, a concave portion is provided on the inner surface of the movable cutting blade, and the intermediate member is held in the concave portion. There is.

In such a trimming device, since the intermediate material is held in the concave portion, a member such as a plate material for holding and fixing the intermediate material is not required, and the number of parts can be reduced.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the recess is formed in a groove shape having a longitudinal direction in the reciprocating direction of the cutting blade, and the intermediate member is formed into a spherical shape that can be rotationally moved in the recess. It is characterized by being formed.

In such a pruning device, when the movable cutting edge slides in a point contact with the spherical intermediate material, the intermediate material rotates in the reciprocating direction of the cutting edge in the recess, so that the movable cutting edge and the intermediate Wear with the material can be reduced.

The invention according to claim 7 has a pair of upper and lower holding plates whose bases are fixed to the main body and arranged to face each other, and a comb-shaped blade portion, and is held between both holding plates to form a differential shape. A pair of upper and lower cutting blades that move back and forth to rub the blades to perform a cutting action, and an intermediate that is interposed between the cutting blades and shields the bases of the upper and lower cutting blades from contact. And a line contact portion that comes into line contact with the surface of the movable cutting edge.

In such a pruning device, since the intermediate member is provided with the point contact portion which comes into point contact with the surface of the movable cutting edge, the movable blade edge reciprocates in a state of being in line contact with the line contact portion, so that the cutting edge is reciprocated. The sliding resistance is reduced and the cutting edge is prevented from coming off the drive mechanism due to vertical movement. Further, as compared with the case where the surface of the movable cutting edge and the intermediate material are in point contact with each other, the contact pressure between the movable cutting edge and the intermediate material can be dispersed to further reduce the abrasion of the movable cutting edge and the intermediate material.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
6 to 6.

FIG. 1 shows a main part of a pruning device according to an embodiment of the present invention, (a) is a longitudinal sectional view and (b) is a lateral sectional view. FIG. 2 is a partially cutaway side view showing the whole of the above cutting device.

As shown in FIGS. 1 and 2, this pruning device has a pair of upper and lower holding plates 1a and 1b whose bases are fixed to the main body so as to face each other, and comb-shaped blades. 1a, 1
a pair of upper and lower cutting blades 2a and 2b which are held between b and differentially reciprocate to rub the blade portions so as to perform a cutting action, and between the cutting blades 2a and 2b. The cutting device is provided with an intermediate member 3 that shields the bases of the upper and lower cutting blades 2a and 2b from contact with each other, and the intermediate member 3 is provided with a point contact portion that makes point contact with the surface of the movable cutting blade. Also,
A plate member 3a having a through hole 3e and fixed to the base side
The intermediate member 3 is formed by the interposing member 4 which is a point contact portion which is a protruding portion which is interposed in the through hole 3e of the plate material 3a and protrudes from the surface of the plate material 3a. An example of such a pruning device is a garden tree clipper, and the garden tree clipper will be described below.

In the garden clipper, the upper and lower cutting blades 2a and 2b are protruded from the front part of the housing 15, the grip 10 having the switch 16 is provided on the upper part, and the auxiliary grip 13 is provided on the upper side of the housing 15. There is. A motor 12 and a speed reduction block 14 are provided inside the housing 15, and the rotation output shaft 7 is attached to the speed reduction block 14. The holding plates 1a, 1b are fixed at their bases to the lower part of the main body, and are loosely fitted and coupled at a longitudinally-spaced interval by a joining portion (not shown) such as a rivet.
Upper and lower cutting blades 2a and 2b are held between them so as to be capable of reciprocating movement.

The eccentric cams 6a and 6b are formed in a substantially disc shape, and the upper and lower rotating output shafts 7 connected to the motor 12 and the speed reducing block 14 are vertically displaced from each other with their centers displaced from each other. The rotation output shaft 7 is rotated to be elliptical. Further, the upper and lower eccentric cams 6a and 6b are fixed to the rotation output shaft 7 so that their phases of rotation are opposite to each other by 180 degrees, and when the upper eccentric cam 6a protrudes to the front side, the lower eccentric cam 6b moves to the rear side. Project to the side.

Further, the upper and lower cutting blades 2a and 2b engage with the corresponding eccentric cams 6a and 6b, and have elliptical connecting holes 2c and 2d having a long diameter in the left and right direction and a short diameter in the front-rear direction, that is, the cutting blade reciprocating direction. Are formed respectively. Then, the upper eccentric cam 6a is engaged with the connecting hole 2c of the upper cutting blade 2a, and the lower eccentric cam 6b is connected with the lower cutting blade 2b.
The rotation output shaft 7 is rotated at a low speed by the motor 12 and the deceleration block 14 so that the upper and lower cutting blades 2a and 2b can reciprocate in opposite directions. Each of the cutting blades 2a and 2b has a comb-shaped blade portion along both side edges, and differentially reciprocates to rub the blade portions to cut a branch of a garden tree.

The intermediate member 3 is formed in a substantially flat plate shape,
The rear part is fixed to the lower holding plate 1b, and the eccentric cam 6 is attached to the front part.
It has a semi-circular recess for accommodating a and 6b, and both side pieces 3b of the recess partition the cutting blades 2a and 2b so that they do not contact each other on the left and right. Rectangular through-holes 3e are provided substantially in the center of the left and right side pieces 3b, and a rectangular body-shaped interposing member 4 having a larger thickness than the side-side pieces 3b is fitted in the through-holes 3e. . The upper and lower ends of the interposing member 4 project from the front and back surfaces of both side pieces 3b to form protrusions, and the upper and lower ends of the protrusions are held in contact with the lower and upper faces of the upper and lower blades, respectively. There is.
As the interposition member 4, a material having a small friction coefficient can be appropriately used.

In such a garden tree clipper, the switch 1
By turning 6 on and rotating the motor 12, the rotation output shaft 7 rotates at a low speed via the speed reduction block 14, and the eccentric cams 6a and 6b rotate in elliptic rotations having 180 ° different phases in the connecting holes 2c and 2d. To do. The eccentric cams 6a and 6b
The cutting blades 2a and 2b are differentially reciprocated in different directions in the minor axis direction of the connecting holes 2c and 2d by the elliptical rotation of 1 to perform the cutting action.

At this time, since the intermediate member 3 is provided with the interposing member 4 having a point contact portion which comes into contact with the surface of the movable cutting edge,
The movable cutting edge reciprocates with the point contact portion in point contact with each other, reducing the sliding resistance of the cutting edge 2 and reducing the cutting edge 2a,
This prevents the eccentric cams 6a and 6b from coming off from the drive mechanism due to the vertical movement of the eccentric 2b, that is, the eccentric cams 6a and 6b from falling out from the linking holes 2c and 2d. Further, since the protruding portion of the interposing member 4 interposed in the through hole 3e of the plate member 3a is the point contact portion of the intermediate member 3, the movable cutting edge 2 slides in a state of point contact with this protruding portion. ing. Further, since the interposing member 4 is made of a material having a small friction coefficient, the sliding resistance between the cutting blades 2a and 2b and the interposing member 4 can be further reduced, and the load on the motor 12 is small. ing.

FIG. 3 is a vertical cross-sectional view of the essential parts showing a trimming device according to another embodiment of the present invention.

As shown in FIG. 3, this pruning device has a pair of upper and lower holding plates 1a and 1b, which are opposed to each other with the base fixed to the main body, and a comb-shaped cutting part, like the pruning device shown above. Then, a pair of upper and lower cutting blades 2a and 2b, which are held between both holding plates 1a and 1b and move reciprocally in a differential shape to rub the blade portions to perform a cutting action, and a pair of upper and lower cutting blades 2a and 2b. A cutting device having an intermediate member 3 which is interposed between 2a and 2b and shields the bases of the upper and lower cutting blades 2a and 2b from contact with each other. Parts are provided. The difference is that the interposition member 4 is provided with a through hole 3e.
It is formed in a spherical shape that can rotate inside. In such a trimming device, since the interposition member 4 is formed into a spherical shape that can rotate within the through hole 3e, the cutting blades 2a and 2b slide in point contact with the projecting portion of the spherical interposition member 4. At this time, the interposition member 4 rotates in the through hole 3e, and the wear of the cutting blades 2a, 2b and the interposition member 4 can be further reduced.

FIG. 4 is a vertical cross-sectional view of the essential parts showing a cutting device according to another embodiment of the present invention.

As shown in FIG. 4, this trimming device has a pair of upper and lower holding plates 1a and 1b, which are opposed to each other with the base fixed to the main body, and a comb-shaped blade portion, like the trimming device shown above. Then, a pair of upper and lower cutting blades 2a and 2b, which are held between both holding plates 1a and 1b and move reciprocally in a differential shape to rub the blade portions to perform a cutting action, and a pair of upper and lower cutting blades 2a and 2b. A cutting device having an intermediate member 3 which is interposed between 2a and 2b and shields the bases of the upper and lower cutting blades 2a and 2b from contact with each other. Parts are provided. The different point is that the contact portions are arranged in parallel in the reciprocating direction of the cutting blade. The contact portion is formed by corrugating the portion between the cutting blades 2a and 2b of the plate-shaped intermediate member 3 into a corrugated shape having several peaks and valleys in the reciprocating direction of the blade, and the top of the peak of the corrugated portion 3f is the upper cutting blade. 2a, and the bottom of the valley is the point contact with the lower cutting edge 2b.

In such a pruning device, since the contact portions are arranged in parallel in the reciprocating direction of the cutting blade, the cutting blades 2a and 2b slide in point contact with the plurality of interposition members 4 and the cutting blades 2a and 2b. The reciprocating motion of 2b is stable and the load is low. Further, the contact pressure between the cutting blades 2a and 2b and the interposed member 4 is dispersed to reduce the abrasion of the cutting blades 2a and 2b and the interposed member 4.

FIG. 5 is a vertical cross-sectional view of a main part showing a pruning device according to another embodiment of the present invention.

As shown in FIG. 5, this pruning device has a pair of upper and lower holding plates 1a and 1b, which are opposed to each other with the base fixed to the main body, and a comb-shaped blade part, like the pruning device shown in the above. Then, a pair of upper and lower cutting blades 2a and 2b, which are held between both holding plates 1a and 1b and move reciprocally in a differential shape to rub the blade portions to perform a cutting action, and a pair of upper and lower cutting blades 2a and 2b. A cutting device having an intermediate member 3 which is interposed between 2a and 2b and shields the bases of the upper and lower cutting blades 2a and 2b from contact with each other. Parts are provided. The different point is that a concave portion 8 is provided in the inner surface of the movable cutting blade in the reciprocating direction of the cutting blade, and the intermediate member 3 is held in the concave portion 8. The recesses 8 are the left and right side pieces 3
It is formed in a groove shape having a longitudinal direction in the reciprocating direction of the cutting edge of b,
The intermediate member 3 is formed into a spherical shape that can be rotationally moved in the recess 8. The intermediate material 3 has a cutting edge 2 whose upper end is the inner surface of the recess 8 and whose lower end is the lower side.
b The upper cutting edge 2a is held in contact with the upper surface
Is moved forward, that is, when the lower cutting edge 2b is moved backward, the intermediate material 3 moves rearward while rotating forward due to friction between the intermediate material 3 and the cutting edge 2. On the contrary, when the upper cutting edge 2a moves backward, that is, when the lower cutting edge 2b moves forward, the friction between the intermediate material 3 and the cutting edge 2 causes the intermediate material 3 to move.
Moves to the front of the recess 8 while rotating backward.

In such a pruning device, since the intermediate member 3 is rotatably held in the recess 8, the plate member 3
A member for holding and fixing the intermediate member 3 such as a is not required, and the number of parts can be reduced. Further, when the movable cutting edge 2 slides in a point contact with the spherical intermediate material 3, the intermediate material 3 rotationally moves in the reciprocating direction of the cutting edge in the recess 8, so that the movable cutting edge 2 and the intermediate material 3 are separated from each other. Can reduce wear.

FIG. 6 is a vertical cross-sectional view of the essential parts showing a cutting device according to another embodiment of the present invention.

As shown in FIG. 6, in this pruning device, a pair of upper and lower holding plates 1 whose bases are fixed to the main body and are opposed to each other are provided.
a and 1b, and a comb-shaped blade portion, which is held between both holding plates 1a and 1b and reciprocally moves in a differential shape to rub the blade portions to perform a cutting action. A cutting device comprising a pair of cutting blades 2a, 2b and an intermediate material 3 interposed between both cutting blades 2a, 2b to shield the upper and lower cutting blades 2a, 2b from contact with each other. 3 is provided with a point contact portion that makes point contact with the surface of the movable cutting edge. The line contact portion is formed by forming a portion between the upper and lower cutting blades 2 of the plate-shaped intermediate member 3 into a groove shape long in the reciprocating direction of the blade, and the bottom surface of the groove portion is the upper surface of the lower cutting blade 2b. I try to come into contact with.

In such a pruning device, since the intermediate member 3 is provided with the line contact portion that comes into contact with the surface of the movable cutting edge 2, the movable cutting edge surface reciprocates with the line contact portion in line contact,
The sliding resistance of the cutting blades 2a and 2b is reduced and the cutting blade 2
The vertical movement of a and 2b prevents the drive mechanism from being disengaged. In addition, the contact pressure between the cutting blades 2a, 2b and the intermediate member 3 is dispersed to reduce the abrasion of the cutting blades 2a, 2b and the intermediate member 3 as compared with the case where the movable cutting edge surface makes point contact with the contact portion. it can.

[0039]

According to the invention of claim 1, since the intermediate member is provided with the point contact portion which makes point contact with the surface of the movable cutting edge, the reciprocating operation is performed with the point contact portion of the intermediate material in point contact with the surface of the movable cutting edge. Exercise,
The sliding resistance of the cutting blade is reduced, and the contact portion supports the cutting blade to prevent the cutting blade from moving up and down. Therefore, even if there are variations in the parts accuracy and assembly accuracy of the cutting blade or the intermediate material, it is possible to prevent wear and lowering of the movement capacity due to surface contact between the cutting blade and the intermediate material, and to perform vertical cutting by moving the cutting blade up and down. It is possible to prevent the blade from coming into contact with and coming off from the drive mechanism.

According to the second aspect of the present invention, since the protruding portion of the interposing member interposed in the through hole of the plate member is the point contact portion of the intermediate member, the movable cutting edge is in point contact with this protruding portion. It is sliding.

According to the third aspect of the present invention, since the interposition member is formed into a spherical shape that can rotate within the through hole, when the movable cutting edge slides in point contact with the projecting portion of the spherical interposition member. In addition, the interposition member rotates within the through hole, and wear of the movable cutting edge and the interposition member can be further reduced.

According to the invention of claim 4, since the point contact portions are arranged in parallel in the reciprocating direction of the cutting blade, the movable cutting blade slides in point contact with the plurality of point contact portions to reciprocate the movable cutting blade. Is stable,
It has a low load. Further, the contact pressure between the movable cutting edge and the interposed member is dispersed to further reduce the wear of the movable cutting edge and the point contact portion.

According to the fifth aspect of the invention, since the intermediate material is held in the recess, a member such as a plate material for holding and fixing the intermediate material is not required, and the number of parts can be reduced.

According to the sixth aspect of the present invention, when the movable cutting edge is point-contacted by the spherical intermediate material and slides, the intermediate material is rotationally moved in the reciprocating direction of the cutting edge in the recess. Wear with the material can be reduced.

According to the invention of claim 7, since the intermediate member is provided with the point contact portion which makes point contact with the surface of the movable cutting edge, the movable blade edge reciprocates in line contact with the line contact portion to reciprocate the cutting edge. The sliding resistance is reduced and the cutting edge is prevented from coming off the drive mechanism due to vertical movement. Further, as compared with the case where the surface of the movable cutting edge and the intermediate material are in point contact with each other, the contact pressure between the movable cutting edge and the intermediate material can be dispersed to further reduce the abrasion of the movable cutting edge and the intermediate material.

[Brief description of drawings]

FIG. 1 shows a main part of a pruning device according to an embodiment of the present invention, in which (a) is a longitudinal sectional view and (b) is a lateral sectional view.

FIG. 2 is a partially cutaway side view showing the whole of the above cutting device.

FIG. 3 is a vertical cross-sectional view of a main part showing a cutting device according to another embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a main part showing a cutting device according to another embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a main part showing a cutting device according to another embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a main part showing a cutting device according to another embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view of a main part showing a conventional pruning device.

[Explanation of symbols]

1 holding plate 1a Upper holding plate 1b Lower holding plate 2 cutting edge 2a Upper cutting edge 2b Lower cutting edge 2c Upper cutting edge connecting hole 2d Lower cutting edge connecting hole 3 Intermediate material 3a Plate material 3b Both sides 3c corrugated part 3d groove 3e through hole 3f corrugated part 4 Interposition member 6 Eccentric cam 6a Upper eccentric cam 6b Lower eccentric cam 7 rotation output shaft 8 recess 10 grip 11 power cord 12 motors 13 Auxiliary grip 14 Deceleration block 15 housing 16 switch

Claims (7)

[Claims] 1. A pair of upper and lower holding plates having a base fixed to a main body and arranged to face each other, and a comb-shaped blade portion. The blade portions are held between both holding plates to reciprocate in a differential shape to move the blade portion. Mowing device provided with a pair of upper and lower cutting blades, at least one of which is rubbed to perform a cutting action, and movable, and an intermediate material which is interposed between the cutting blades and shields the base portions of the upper and lower cutting blades from contact with each other. 2. The cutting device according to claim 1, wherein the intermediate member is provided with a point contact portion that makes point contact with the surface of the movable cutting edge. 2. A plate member having a through hole and fixed to the base side, and an end portion of a protruding portion which is inserted in the through hole of the plate member and protrudes from the surface of the plate member serves as a point contact portion. The cutting device according to claim 1, wherein an intermediate member is formed from the mounting member. 3. The cutting device according to claim 2, wherein the interposition member is formed in a spherical shape rotatable in the through hole. 4. The cutting device according to claim 1, wherein the point contact portions are arranged in parallel in the reciprocating direction of the cutting blade. 5. The cutting device according to claim 1, wherein a concave portion is provided on the inner surface of the movable cutting blade, and the intermediate member is held in the concave portion. 6. The cutting device according to claim 5, wherein the concave portion is formed in a groove shape having a longitudinal direction in the reciprocating direction of the cutting blade, and the intermediate member is formed in a spherical shape capable of rotating and moving in the concave portion. . 7. A pair of upper and lower holding plates having a base fixed to the main body and opposed to each other, and a comb-shaped blade, which are held between both holding plates to reciprocate in a differential shape to move the blade. Mowing device provided with a pair of upper and lower cutting blades, at least one of which is rubbed to perform a cutting action, and movable, and an intermediate material which is interposed between the cutting blades and shields the base portions of the upper and lower cutting blades from contact with each other. 2. The cutting device according to claim 1, wherein the intermediate member is provided with a line contact portion that comes into line contact with the surface of the movable cutting edge.