JP2008017788A - Pruning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pruning machine capable of cutting down parts count and assembly man-hour to reduce cost. <P>SOLUTION: This pruning machine has a holder plate 5 and a blade holder 6 (holder members) whose ends are fixed to a main body and which are oppositely arranged each other, and an upper blade 3 and a lower blade 4 which are arranged between the holder plate 5 and the blade holder 6. The blade holder 6 is set with a plurality of projecting parts 6b contacting the holder plate 5. The projecting parts 6b are unitedly set with the blade holder 6 in a protruding condition by press molding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a trimming machine for cutting grass and tree branches.

  This type of trimming machine has an upper blade and a lower blade formed by arranging two holder members, one of which is fixed to the main body, vertically and spaced apart by a predetermined distance, and forming a plurality of cutting edges at both longitudinal edges. In some cases, the upper and lower blades are interposed between the holder members, and the upper blade and the lower blade are alternately reciprocated in opposite directions to perform a required operation.

  Here, the blade assembly structure of the conventional trimming machine is shown in FIGS.

  FIG. 7 is an exploded perspective view showing a conventional blade assembling structure of a trimming machine, and FIG. 8 is a partial cross-sectional view showing the blade assembling structure. In these figures, 103 is an upper blade and 104 is a lower blade. As shown in FIG. 7, a plurality of cutting blades 103a and 104a are formed along the longitudinal direction at both ends in the width direction of the upper blade 103 and the lower blade 104, respectively. A plurality (four in the illustrated example) of long holes 103b and 104b are formed in the upper blade 103 and the lower blade 104 at appropriate intervals in the longitudinal direction.

  On the other hand, 106 is a blade holder whose one end is fixed to a main body (not shown), 105 is a holder plate disposed above the blade holder 106, and the upper blade 103 and the lower blade 103 are stacked one above the other. Thus, it is interposed between the holder plate 105 and the blade holder 106 so as to be able to reciprocate.

By the way, in order to secure a gap between the holder plate 105 and the blade holder 106 for reciprocating the upper blade 103 and the lower blade 104 between the holder plate 105 and the blade holder 106, the upper blade 103 and the lower blade 104 are secured. A cylindrical distance ring 120 is fitted into each of the plurality of long holes 103b and 104b formed in the first and second screws, and a screw 108 inserted from below into a circular hole 106c formed in the blade holder 106 as shown in FIG. The distance ring 120 between the holder plate 105 and the blade holder 106 is tightened by tightening a nut 109 that is screwed into an upper end portion of the screw 108 protruding upward from the holder plate 105 of the screw 108. For height Was ensured intervals (e.g., see Patent Document 1).
Japanese Patent Application Laid-Open No. 11-243779

  In the conventional blade assembly structure described above, at least two distance rings are provided in order to ensure a gap between the holder plate 105 and the blade holder 106 that is necessary for the upper blade 103 and the lower blade 104 to reciprocate while sliding. 120 is necessary, and since the distance ring 120 is configured separately from the holder plate 105 and the blade holder 106, there is a problem in that the number of parts and the number of assembling steps increase, resulting in an increase in cost.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a trimming machine that can reduce the number of parts and the number of assembling steps to reduce the cost.

  In order to achieve the above object, the invention described in claim 1 is characterized in that two holder members, one of which is fixed to the main body and disposed opposite to each other, and an upper blade and a lower blade disposed between the holder members, , A plurality of convex portions in contact with the other are provided on one of the two holder members.

  According to a second aspect of the present invention, in the first aspect of the present invention, the convex portion is formed integrally with the holder member.

  According to the first aspect of the present invention, since the convex portion for securing a predetermined interval (an interval at which the upper blade and the lower blade can be sandwiched) is provided between the upper and lower two holder members, A distance ring as a separate part is not required as in the prior art, and the number of parts can be reduced. Further, since the trouble of assembling the distance rings as separate parts one by one is eliminated, the number of assembling steps can be reduced, and the cost of the trimming machine can be reduced due to the reduction in the number of parts.

  According to invention of Claim 2, the number of parts and an assembly man-hour can be reduced by forming a convex part integrally in a holder member by press molding.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is an external perspective view of a trimming machine according to the present invention, FIG. 2 is an exploded perspective view showing a blade assembly structure of the trimming machine, and FIG. 3 is a partial sectional view showing the blade assembly structure.

  A trimming machine 1 shown in FIG. 1 includes an upper and lower upper blade 3 and a lower blade 4 (see FIG. 2) extending horizontally from a main body 2, and the upper blade 3 and the lower blade 4 are stacked one above the other. These are interposed between the upper and lower holder plates 5 and the blade holder 6 (see FIG. 2), which extend horizontally. As shown in FIG. 1, a power supply power cord 7 extends from the main body 2.

  Here, a plurality of saw blades 3a and 4a are formed along the longitudinal direction at both edges in the width direction of the upper blade 3 and the lower blade 4, respectively. As shown in FIG. In the upper blade 3 and the lower blade 4, four long holes 3b, 4b that are long in the length direction are formed at appropriate intervals in the length direction. Further, long hole-like engaging holes 3c and 4c are formed in the widthwise direction at the ends of the upper blade 3 and the lower blade 4 on the main body 2 side.

  As shown in FIG. 2, the holder plate 5 is composed of a channel member having a U-shaped cross section with both edges in the width direction rising upward, and four circular holes 5a are formed at the center in the width direction. It is formed at an appropriate interval in the longitudinal direction (the same interval as the long holes 3a and 4a formed in the upper blade 3 and the lower blade 4).

  Further, the blade holder 6 is formed into a flat plate shape, and a circular recess 6a is formed at the end on the main body 2 side, at the same position as the circular hole 5a formed in the holder plate 5 at the center in the width direction. A total of four bottomed cylindrical projections 6b are integrally projected by press molding, for example. Here, the upper surface of each convex portion 6b abuts on the lower surface of the holder plate 5 as described later (see FIG. 3), and circular holes 6c (see FIG. 3) are formed on the upper surface. Four circular holes 6d are formed around the circular recess 6a at the end of the blade holder 6 on the main body 2 side.

  Thus, the upper blade 3 and the lower blade 4 are interposed between the holder plate 5 and the blade holder 6 that are arranged at appropriate intervals in the vertical direction so as to be reciprocally movable. The assembling procedure will be described.

  First, the upper blade 3 and the lower blade 4 are vertically overlapped with the long holes 3b and 4b formed in the upper blade 3 and the lower blade 4, respectively, and the upper blade 3 and the lower blade 4 are vertically overlapped. The convex portions 6 b protruding from the blade holder 6 are fitted into 4 b and the upper blade 3 and the lower blade 4 are placed on the blade holder 6.

  Next, the holder plate 5 is overlaid on the convex portion 6 b of the blade holder 6, and the circular hole 5 a formed in the holder plate 5 is aligned with the circular hole 6 c of the convex portion 6 b protruding from the blade holder 6. As shown in FIG. 3, a screw 8 is passed through the circular holes 6c and 5a from the inside (lower side) of each convex part 6b, and a nut 9 screwed into an upper end part protruding upward from the holder plate 5 of the screw 8 is provided. tighten. Then, the holder plate 5 and the blade holder 6 are assembled, and the upper surface of the convex portion 6b of the blade holder 6 comes into contact with the lower surface of the holder plate 5, so that the distance between the holder plate 5 and the blade holder 6 is the height of the convex portion 6b. The height h is set, and the upper blade 3 and the lower blade 4 are interposed between the upper and lower blades 4 so as to reciprocate.

  Next, the internal structure and operation of the trimming machine 1 according to the present invention will be described with reference to FIGS.

  FIG. 4 is a side sectional view of the main part of the trimming machine according to the present invention, and FIG. 5 is a bottom view of the crank cam portion showing the operation of the blade of the trimming machine.

  As shown in FIG. 4, the main body 2 of the trimming machine 1 includes a motor 10 as a drive source in a vertically placed state, and an output shaft (motor shaft) 11 of the motor 10 extends vertically downward in FIG. 4. The intermediate portion is rotatably supported by the holder 13 via the bearing 12, and a pinion 14 is formed at the end portion (the lower end portion in FIG. 4).

  A pin 15 extending vertically downward in FIG. 4 is pressed into the holder 13 in parallel with the output shaft 11, and a gear 16 and a crank cam 17 are rotatably supported on the pin 15. Here, the gear 16 meshes with the pinion 14 formed on the output shaft 11, and the crank cam 17 is fitted and connected to the gear 14 so that both rotate together. One end of the blade holder 6 (the end on the main body 2 side) is connected to the main body 2 by a bolt 18 inserted into four circular holes 4d (see FIG. 2) formed therein and a nut 19 screwed into the bolt 18. A part of the crank cam 17 is accommodated in a circular recess 6a formed on the side.

  The crank cam 17 is integrally formed with two upper and lower disk-shaped eccentric cams 17a and 17b that are eccentric with respect to the pin 15, with a phase difference of 180 ° from each other, as shown in FIG. The eccentric cam 17 a engages with the engagement hole 3 c formed at one end of the upper blade 3, and the lower eccentric cam 17 b engages with the engagement hole 4 c formed at one end of the lower blade 4. ing.

  Next, the operation of the trimming machine 1 according to the present invention will be described.

  When the motor 10 that is a driving source is energized and driven, the rotation of the output shaft 11 is decelerated through the pinion 14 and the gear 16 and transmitted to the crank cam 17, and the crank cam 17 rotates. Driven. The rotation of the crank cam 17 is converted into the reciprocating motion of the upper blade 3 and the lower blade 4 that engage with the upper and lower eccentric cams 17a and 17b of the crank cam 17 as described above.

  Here, the upper and lower eccentric cams 17a and 17b of the crank cam 17 are formed with a phase difference of 180 ° at a position eccentric with respect to the pin 15 as described above. Grass and tree branches are trimmed by a plurality of cutting blades 3a and 4a (see FIG. 2) which are reciprocated alternately in opposite directions and are formed along the longitudinal direction at both edges in the width direction.

  In the above, in the trimming machine 1 according to the present invention, as described above, a predetermined interval (interval at which the upper blade 3 and the lower blade 4 can be clamped) h is secured between the upper and lower holder plates 5 and the blade holder 6. Since the convex portion 6b for projecting is integrally provided on the blade holder 6, the distance ring 120 (see FIGS. 7 and 8) as a separate part is not required as in the prior art, and the number of parts can be reduced.

  Moreover, since the trouble of assembling the distance rings 120 as separate parts one by one is eliminated, the number of assembling steps can be reduced, and the cost of the trimming machine 1 can be reduced due to the reduction in the number of parts. .

  In the present embodiment, the convex portion 6b is projected integrally with the blade holder 6 by press molding or the like. However, as shown in FIG. 6, the convex portion 20 is formed separately from the blade holder 6, Even if the configuration in which the convex portion 20 is bonded to the blade holder 6 by welding or the like, the same effect as described above can be obtained. In the present embodiment, the convex portion 6b is formed on the blade holder 6 side. However, it goes without saying that the convex portion may be formed on the holder plate 5 side.

1 is an external perspective view of a trimming machine according to the present invention. It is a disassembled perspective view which shows the blade assembly | attachment structure of the trimming machine which concerns on this invention. It is a fragmentary sectional view which shows the blade assembly structure of the trimming machine which concerns on this invention. It is a sectional side view of the principal part of a trimming machine which concerns on this invention. It is a bottom view of the crank cam part which shows operation | movement of the blade of the trimming machine which concerns on this invention. It is a fragmentary sectional view which shows another form of the blade assembly structure of the trimming machine which concerns on this invention. It is a disassembled perspective view which shows the blade assembly structure of the conventional trimming machine. It is a fragmentary sectional view which shows the blade assembly | attachment structure of the conventional trimming machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crop machine 2 Main body 3 Upper blade 3a Cutting blade of upper blade 3b Long hole of upper blade 3c Engaging hole of upper blade 4 Lower blade 4a Cutting blade of lower blade 4b Long hole of lower blade 4c Engaging hole of lower blade 5 Holder plate (holder member)
5a Circular hole of holder plate 6 Blade holder 6a Circular recess of blade holder 6b Projection of blade holder 6c, 6d Circular hole of blade holder 7 Power cord 8 Screw 9 Nut 10 Motor 11 Motor output shaft 12 Bearing 13 Holder 14 Pinion 15 Pin 16 Gear 17 Crank cam 17a, 17b Eccentric cam 18 Bolt 19 Nut

Claims (2)

In a trimming machine having two holder members, one of which is fixed to the main body and disposed opposite to each other, and an upper blade and a lower blade disposed between the holder members,
A trimming machine, wherein one of the two holder members is provided with a plurality of convex portions in contact with the other.   2. The trimming machine according to claim 1, wherein the convex part is formed integrally with the holder member.

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