JP2010104340A - Hedge trimmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hedge trimmer having a vertical pair of blades, and suppressing a motion for an upper blade to move to the lower direction with an easy structure. <P>SOLUTION: This hedge trimmer is such that an incision is made in at least one blade followed by bending it up so as to form a stepped part projecting into an interval direction to the other blade, and as a result, when either the upper or lower blade approaches the direction of the other blade during work, the stepped part and the other blade made of the same material contact each other, so the interval between the upper and lower blades is suppressed from becoming narrow. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a trimming machine provided with a blade used for trimming trees and trimming hedges.

In a conventional trimming machine, when a strong force is applied to the upper blade 1, the bent portion 1d of the upper blade 1 is deformed and moves downward. At that time, there is a problem that the upper blade 1 is detached from the eccentric cam 3 engaged with the upper blade 1. In order to solve such a problem, as shown in Patent Document 1, a trimming machine is proposed in which a plate 4 is inserted into a gap between upper and lower blades, and the upper blade 1 is prevented from moving downward at the time of activation. (For example, refer to Patent Document 1).

JP 2007-135435 A

The trimming machine configured as described above uses the plate 4 as a separate part in order to suppress the movement of the upper blade 1 moving downward, increasing the number of parts, increasing the cost, and complicating the configuration. There was a problem of becoming. In addition, since the number of parts increases, the dimensional accuracy and assembly accuracy variation during assembly increase, the contact load between the cutting blade 5 and the intermediate material may not be stable, and the load may increase. There was a problem that the contact load of 4 became large. Further, while the blade 4 has a high hardness depending on the material and heat treatment, a metal plate having a hardness lower than that of the blade 4 is generally used for the plate. .
In addition, when a protrusion for pushing up the upper blade is provided on the resin member etc. on the main body side, the number of parts does not increase, but the structure becomes complicated because it is necessary to process the parts on the main body side. There is a possibility that a member having low hardness is used for the blade, or that wear or deformation occurs during contact.
An object of the present invention is to solve the above-described drawbacks with a simple configuration, to improve the life, and to provide a trimming machine with high work efficiency.

  Of the inventions disclosed in the present application, typical features will be described as follows.

  According to one aspect of the present invention, a main body with a built-in drive source, an eccentric cam that converts rotation of the drive source into a horizontal swing motion, and a plurality of cutting edges are formed along both edges in the width direction. In a trimming machine provided with an upper blade having a blade portion and an engagement hole for engaging with a crank cam and a pair of upper and lower blades composed of a lower blade, at least one of the pair of upper and lower blades is reciprocated by the eccentric cam. It is movable, and at least one of the pair of upper and lower blades is provided with a stepped portion protruding in the gap direction with the other blade, and the stepped portion and the other blade are configured to be in contact with each other. .

  According to another feature of the present invention, it is preferable that the step portion and the contact portion of the other blade have substantially the same surface hardness value.

  According to still another feature of the present invention, the stepped portion has a cut in a direction along the reciprocating motion at a position where the blades overlap each other during the reciprocating motion of the blade, and a gap direction between the pair of upper and lower blades in the vicinity of the cut. It is preferable that they are integrally formed by bending up.

  According to the first aspect of the present invention, at least one of the pair of upper and lower blades can be reciprocated by the eccentric cam, and at least one of the pair of upper and lower blades protrudes in a gap direction with the other blade. Since the step is provided so that the stepped portion and the other blade can come into contact with each other, the movement of the blade can be suppressed without increasing the number of parts or processing the main body. In addition, variation in dimensional accuracy can be reduced, and these can reduce component costs and assembly costs. Furthermore, since no processing is required on the main body side, the configuration does not become complicated.

  According to the second aspect of the present invention, the contact portion between the stepped portion and the other blade has substantially the same surface hardness value, so that mutual wear can be suppressed and the life of the trimming machine can be extended.

  According to the invention of claim 3, the stepped portion is integrally formed by making a cut at a position where the blades overlap each other during the reciprocating movement of the blade, and bending the cut in the gap direction between the pair of upper and lower blades. Therefore, the step portion can be reliably molded with a simple configuration.

  According to a fourth aspect of the present invention, the cut is formed in a direction along the reciprocating motion of the blade, so that the shear surface of the cut when the cut portion is formed becomes a resistance to the reciprocating motion. Therefore, the blade can be driven smoothly.

  According to the invention of claim 5, since the upper blade is movable by the drive source and the step portion is provided on the upper blade, the step portion needs to be enlarged in consideration of the movement of the upper blade. Therefore, the cut length of the upper blade can be minimized, and the upper blade can stably suppress movement in the lower blade direction.

  According to the invention of claim 6, the upper blade is movable by the drive source, the lower blade is fixed to the main body, and the step portion is provided on the lower blade. Can be provided with a space for making a sufficient length of cut, so that the bending process can be easily performed.

  1st Embodiment in the trimming machine of this invention is described according to FIGS.

  1 is an external perspective view of a trimming machine according to the present invention, FIG. 2 is an external view and a partial cross-sectional view of the trimming machine according to the present invention, FIG. 3 is an explanatory diagram showing the relationship between upper and lower blades, and FIG. FIG.

  As shown in FIG. 1, the brush cutter 6 includes a main body housing 5 incorporating a motor 8 as a drive source, and upper and lower blades 1 and 2 for trimming branches and leaves extending horizontally from the bottom of the main body housing 5. ing. The upper blade 1 and the lower blade 2 are superposed vertically, and only the upper blade 1 is interposed between the upper and lower holder plates 10 and the blade holder 11 extending horizontally so as to reciprocate in the front-rear direction. Yes. The motor 8 is connected to a power cord 12 for power supply, and is configured such that power flows through the power cord 12 when the switch 7 is turned on / off.

  The holder plate 10 is formed in a U-shaped cross section in which both edges in the width direction rise upward. At the center in the width direction, the holder plate 10 is circular at the same intervals as the long holes formed in the upper and lower blades 1 and 2. A hole is formed.

  Further, the blade holder 11 is formed on a flat plate, a circular recess is formed at the end on the main body 5 side, and a circular hole is formed at the same position as the circular hole formed in the holder plate 10 at the center in the width direction. .

  In FIG. 2, the motor 8 has a motor shaft extending downward, and the motor shaft meshes with the gear 9 near the lower end to reduce the speed. An eccentric cam 3 that engages with an engagement hole of the upper blade 1 to be described later is fixed to the rotating shaft that supports the gear 9.

  3 and 4, the upper blade 1 and the lower blade 2 are made of tool steel that has been heat-treated. A plurality of comb-shaped cutting blades 1f and 2f are formed along the longitudinal direction at both edges in the width direction of the body portions of the upper and lower blades 1 and 2. Further, long holes in the longitudinal direction are formed in the body portions of the upper and lower blades 1 and 2 at appropriate intervals. Further, the upper blade 1 which is a movable blade is formed with an elongated engagement hole 1g which is long in the width direction.

  Since the upper blade 1 forms a gap 13 between the upper blade 1 and the lower blade 2 during driving, the vicinity of the engagement hole 1g is bent upward by a bending portion 1d. Further, flat surfaces 1c and 2c are formed around the engagement holes 1g and the circular holes 2g of the upper and lower blades 1 and 2, respectively. The flat surface 2c of the lower blade 2, which is a fixed blade, has a larger area than the flat surface 1c of the upper blade 1, which is a movable blade, and mounting holes 2d are formed at the corners, and the lower blade 2 has the mounting holes 2d. It is attached to the main body housing 5 by use.

  Here, the lower blade 2 is formed with a cut and bent portion 2 a that is a stepped portion, and protrudes toward the upper blade 1 and toward the gap 13 between the upper and lower blades 1 and 2. The cut and bent portion 2a is formed by deforming the lower blade 2 by inserting two cuts 2b in the direction along the reciprocating motion of the upper blade 1 and pressing between the two cuts 2b from above and below to bend up. Has been. Accordingly, the stepped portion 2a of the lower blade 2 has substantially the same surface hardness value as that of the lower blade 2, and is configured to be substantially equal to the surface hardness value of the upper blade 1. The cut and bent portions 2a are provided one by one across the circular hole 2g in the width direction, and are arranged so as to always overlap the upper blade 1 that reciprocates. It is desirable that the protruding amount of the cut and bent portion 2a has a slight gap with the upper blade 1, and the downward movement of the upper blade 1 is allowed by this gap, so that a certain degree of accuracy is obtained. It is necessary to form with.

  As described above, the upper blade 1 is configured as a movable blade that can be swung back and forth by the rotation of the eccentric cam 3, and the lower blade 2 is a fixed blade that is fixed to the main body housing 5. Thus, grass, tree branches, and the like are trimmed by the lower blade 2 and the cutting blades 1f and 2f of the upper blade 1.

  Next, the operation of the handheld trimming machine 6 having the above configuration will be described.

  When the switch 6 is turned on, power is supplied from the power cord 12 to the motor 8 built in the main body 6, and the output from the motor 8 is decelerated through the gear 9, and is rotated by the eccentric cam 3. To the reciprocating motion of the upper blade 1, and branches and leaves are trimmed by meshing with the fixed lower blade 2.

  Here, during the reciprocating motion of the upper blade 1, when a strong force is applied to the upper blade 1, the bent portion 1d of the upper blade 1 is deformed and is engaged with the eccentric cam 3 bent upward by the bent portion 1d. (Left side of the bent portion 1d in FIG. 2) moves downward. At that time, the cut and bent portion 2 a of the lower blade comes into contact with the flat surface 1 c of the upper blade 1 and suppresses the downward movement of the upper blade 1.

  As described above, in the present embodiment, the lower blade 2 of the pair of upper and lower blades 1 and 2 provided at the bottom of the trimming machine 6 is provided with the cut and bent portion 2a as a stepped portion protruding in the direction of the gap 13 with the upper blade 1. By providing, it is possible to suppress the movement of the upper blade 1 moving downward without increasing the number of parts or processing on the main body side, and reducing variations in dimensional accuracy and assembly accuracy. The configuration can reduce part costs and assembly costs. Furthermore, according to the blade of the present invention, since the processing on the main body side is not required, the combination of the blade and the main body is not limited and can be used for a general mower. Further, since the movable range is limited between the closest members of the upper and lower blades 1 and 2, the moment applied to the contacted portion can be minimized, and damage and deformation can be prevented.

  In the present embodiment, the cut and bent portion 2a is formed integrally with the lower blade 2 by a simple configuration in which a cut is made in the lower blade 2, and therefore, the cut and bent portion 2a and the upper blade are easily formed. Since 1 can be a contact between members having equivalent surface hardness values, it is possible to provide a long-life trimming machine without causing problems such as wear, damage or deformation of either one. . Further, since they are integrally formed, there is no problem that they are detached due to an impact during driving, and the accuracy of the joint portion and the mounting portion is deteriorated, and it is possible to maintain a good driving state.

  Further, since the notch 2b is inserted in a direction along the reciprocating motion of the upper blade 1, the shear surface of the cut surface when the notched portion is formed does not become a resistance to the reciprocating motion, and the blade is driven smoothly. It becomes possible to do.

  Furthermore, in the present embodiment, the cutting and bending portion 2a is provided on the lower blade 1 of the fixed blade that can take a larger area than the movable blade, so that the cutting can be made with a margin and bending work can be performed. Can also be done easily.

  Next, 2nd embodiment in the trimming machine of this invention is described according to FIGS. 5-7. In the present embodiment, parts having the same functions as those in the first embodiment are denoted by the same reference numerals, and repeated description is omitted.

  FIG. 5 is an external view and a partial cross-sectional view of the trimming machine according to the present invention, FIG. 6 is an explanatory view showing the relationship between the upper and lower blades, and FIG.

  In the second embodiment, the upper blade 1 is provided with a cut and bent portion 1a as a stepped portion and protrudes toward the lower blade 2 and toward the gap 13 between the upper and lower blades. The cut and bent portion 1a is formed by inserting two cuts 1b into the upper blade 1 and deforming the two cuts 1b by bending from above and below with a press. Therefore, the step portion 1a of the upper blade 1 and the upper blade 1 have substantially the same surface hardness value. The cut and bent portions 1a are provided one by one with an engagement hole 1g engaging with the eccentric cam 3 in the width direction.

  In FIG. 5, when the trimming machine 6 switches on the switch 7, electric power is supplied to the motor 8 built in the main body 6, the output from the motor 8 is decelerated through the gear 9, and the eccentric cam 3 starts the rotational movement. It converts into the reciprocating motion to which the upper blade 1 and the lower blade 2 face each other, and branches and leaves are trimmed. During the reciprocating motion of the upper blade 1 and the lower blade, when a strong force is applied to the upper blade 1, the bent portion 1d of the upper blade is deformed and moves downward. At this time, the cut and bent portion 1a of the upper blade comes into contact with the lower blade 2 to suppress downward movement.

  As described above, in the present embodiment, the upper blade 1 of the pair of upper and lower blades 1 and 2 of the brush cutter 6 is provided with the cut and bent portion 1a as a stepped portion protruding in the direction of the gap 13 with the lower blade 2. As a result, the movement of the upper blade 1 moving downward can be suppressed while suppressing an increase in the number of parts.

  Further, in the present embodiment, the cut and bent portion 1a is formed by a simple configuration in which a cut is made in the upper blade 1, so that it is easy to form and the cut and bent portion 1a and the lower blade 2 are made to have the same surface. Since the members having hardness values can be brought into contact with each other, it is possible to provide a long-life trimming machine without causing problems such as wear, damage or deformation of either one.

  Further, since the cut 1b is inserted in a direction along the reciprocating motion of the upper blade 1, the shear surface of the cut when the cut portion is formed does not become a resistance to the reciprocating motion, and the blade is driven smoothly. It becomes possible to do.

  Furthermore, in the present embodiment, the cut and bent portion 1a is provided on the upper blade 1 which is a movable blade, so that only a small cut and bent portion is formed, and even if the front and rear positions change when swinging, the upper and lower positions can be stabilized. The effect of suppressing the downward movement of the blade 1 can be exhibited.

  As described above, in the trimming machine according to the present embodiment, the step portion 2a that protrudes from the lower blade 2 is provided and the upper blade 1 is configured to be a flat surface, or the step portion 1a that protrudes downward from the upper blade 1 is provided. Although the structure which made the braid | blade 2 the flat surface was demonstrated, it is not restricted to these, It is good also as a structure which provided the level | step-difference part in both upper and lower braid | blades. According to this, it becomes possible to prevent the movement of the upper and lower blades more reliably.

  In the trimming machine according to the present embodiment, the upper blade 1 is a movable blade that can be reciprocated back and forth, and the lower blade 2 is a fixed blade. It can be applied in the same manner, and by providing a stepped portion at least one of them, it is possible to obtain an operational effect that the movement of the blade can be suppressed without increasing the number of parts or performing processing on the main body side. It is something that can be done.

As mentioned above, although demonstrated based on embodiment which shows this invention, this invention is not limited to the above-mentioned form, A various change is possible within the range which does not deviate from the meaning.

1 is an external perspective view of a trimming machine according to the present invention. It is a partial sectional view of the trimming machine concerning a first embodiment of the present invention. 1 shows a configuration of a lower blade 2, a raised portion 2a of the lower blade, and an upper blade 1 according to an embodiment of the present invention. The lower blade 2 which concerns on embodiment of this invention, and the cut-up part 2a of a lower blade are shown. It is a partial sectional view of the trimming machine concerning a first embodiment of the present invention. 1 shows a configuration of an upper blade 1, an upper blade cut-down portion 1a, and a lower blade 2 according to an embodiment of the present invention. The upper blade 1 which concerns on embodiment of this invention, and the cut-down part 1a of an upper blade are shown. The structure of the trimming machine at the time of pinching a plate between upper and lower blades which is an example of a prior art is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper blade 1a Cutting and bending part 1b Cutting 1c Flat surface 1d Bending part 1f Cutting blade 1g Engagement hole 2 Lower blade 2a Cutting and bending part 2b Cutting 2c Flat surface 2f Cutting blade 3 Eccentric cam 5 Main body housing 6 Pruning machine 7 Switch 8 Motor 9 Gear 13 Clearance

Claims (6)

A main body with a built-in drive source, an eccentric cam that converts the rotation of the drive source into a horizontal swing motion, and a member that engages with a crank portion and a blade formed with a plurality of cutting edges along both edges in the width direction. In a trimming machine provided with a pair of upper and lower blades consisting of an upper blade and a lower blade formed with a joint hole,
At least one of the pair of upper and lower blades can be reciprocated by the eccentric cam, and at least one of the pair of upper and lower blades is provided with a stepped portion protruding in a gap direction with the other blade, A trimming machine characterized in that the other blade can be contacted.   2. The trimming machine according to claim 1, wherein the contact portion between the step portion and the other blade has substantially the same surface hardness value.   The step portion is integrally formed by making a cut at a position where the blades overlap each other during the reciprocating motion of the blade, and bending the cut in the gap direction between the pair of upper and lower blades. Or the trimming machine of 2 description.   The cutting machine according to claim 3, wherein the cutting is made in a direction along a reciprocating motion of the blade.   The trimming machine according to any one of claims 1 to 4, wherein the upper blade is moved by the driving source, and the stepped portion is provided on the upper blade.   The upper blade is moved by the driving source, the lower blade is fixed to the main body, and the stepped portion is provided on the lower blade. A trimming machine given in any 1 paragraph.

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