JP2008173068A - Pruning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pruning machine designed so that a pair of blades are easily set up when assembled, and the space between the blades is adjustable when the blades are worn. <P>SOLUTION: The pruning machine 1 has an outer plate 47 placed so as to sandwich a pair of blades 10, 12, an intermediate plate 44, a washer 80d, a collar 80c passed through long holes 80d of the blades 10,12 and maintaining the space between the washer 80d and the intermediate plate 44 in a prescribed distance L2, the intermediate plate 44, screws 80f with which the collar 80c and the washer 80d are connected to each other, and a push screw 84 elastically deforming the intermediate plate 44 toward the surfaces 10e of the blades 10, 12, at the tip end parts 6f of the blades 10, 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a trimming machine, and more particularly to a trimming machine for trimming garden trees, planting, and the like.

  In a trimming machine for trimming garden trees, planting, etc., a so-called hedge trimmer, there is a kind of trimming machine in which a pair of blades having a plurality of cutting blades along the longitudinal direction are reciprocated in opposite directions by a rotary power machine. Conventionally known.

  In order to obtain a good cutting condition of the cutting blade, it is preferable to regulate a gap between the pair of blades. Therefore, in one form of the conventional trimming machine, the pair of blades passes between the pair of blades and is fixed between the plates or washers fixed to both ends of the collar slightly longer than the total thickness of the pair of blades. Had been placed in. In this case, the gap between the pair of blades is the difference between the length of the collar, that is, the distance between the plate or the washer, and the total thickness of the pair of blades. By determining the length of the collar according to the thickness of the blade, a good cutting condition can be obtained. In this form, when assembling the trimming machine of one form, the collar is passed through the pair of blades, the pair of blades is sandwiched between the plates or the washers, and the plate or the washers are screwed or the like. The gap between the pair of blades exhibiting a good cutting condition can be set only by being fastened to the collar.

  However, when the one type of trimming machine is used for a long period of time, the pair of blades are worn, and the gap between the pair of blades gradually increases, so that the cutting condition becomes worse.

  In applications such as tea leaf trimming, which requires precise trimming, it is necessary to maintain good cutting conditions even after long-term use. Therefore, in another form of the conventional trimming machine, there is a mechanism that can adjust the gap between the pair of blades when the pair of blades are worn due to long-term use of the trimming machine of the other form. It was provided. For example, a trimming machine that presses the pair of blades together with a spring (see, for example, Patent Document 1) and a distance between the plate or the washer so as to always eliminate the gap between the pair of blades. There is known a trimming machine in which the plate or the washer is movably attached to a screw passing through the pair of blades (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 6-50429 (FIG. 1) Japanese Patent Laid-Open No. 10-327669 (FIGS. 2 and 3)

  In the trimming machine that presses the pair of blades together with the spring, when the load when the cutting blade trims a garden tree or the like becomes larger than the pressing force of the spring, the gap between the pair of blades is widened, As a result, the cutting condition may deteriorate.

  In the trimming machine in which the plate or the washer is movably attached to a screw passing through the pair of blades, it is necessary to adjust the gap between the pair of blades for each screw during assembly. It takes time and labor, and increases the cost of the trimming machine.

  Accordingly, there is a need for a trimming machine that facilitates setting of the gap between the pair of blades during assembly and that allows adjustment of the gap between the pair of blades when the pair of blades are worn.

  Accordingly, an object of the present invention is to provide a trimming machine in which a gap between the pair of blades can be easily set during assembly and the gap between the pair of blades can be adjusted when the pair of blades are worn. It is in.

  In order to achieve the above object, a trimming machine according to the present invention includes a pair of blades extending in the longitudinal direction and extending and reciprocatingly slides between the pair of blades provided at the base ends of the pair of blades. A mowing machine having a driving means for moving, an outer plate disposed on one side with respect to the pair of blades, and a pressing member disposed on the other side with respect to the pair of blades. A first intermediate plate disposed between the outer plate and the pair of blades and extending in the longitudinal direction; and a first plate formed on the pair of blades on a proximal end side of the pair of blades. The base end side is left so as to leave a gap of a predetermined dimension inserted in the long hole and allowing the pair of blades to slide while exhibiting a good cutting condition. A first spacing member for maintaining a first predetermined distance between the presser member and the intermediate plate, and the intermediate plate, the first spacing member, and the proximal-side pressing member are connected to each other. A first fastening means for fastening, and further extending the intermediate plate through the outer plate to the surface on the one side of the intermediate plate at the tip of the pair of blades. And a pressing member for elastically deforming toward the surface on the one side.

  In the trimming machine configured as described above, when the pair of blades reciprocate relatively, a garden tree or the like is trimmed by the blades. Further, the first spacing member inserted through the long hole of the pair of blades includes the intermediate plate disposed on the one side of the pair of blades and the pressing member disposed on the other side. Is maintained at a first predetermined distance. Therefore, the gap between the pair of blades, which is the remainder obtained by subtracting the thickness of the pair of blades from the first predetermined distance, can be set to a predetermined dimension that exhibits a good degree of cutting of the pair of blades. it can. Since the intermediate plate, the first spacing member, and the pressing member are simply fastened by the first fastening means, the gap of the predetermined dimension is set very easily during the assembly. be able to.

  Further, when the pair of blades are worn and the thickness thereof is reduced, the gap between the pair of blades becomes larger than the gap of the predetermined dimension. Thereby, a good cutting condition is not exhibited. However, since the base end side of the intermediate plate is fastened by the first fastening means, when the pressing member pushes the tip end portions of the pair of blades, the front end side of the intermediate plate becomes the pair of blades It is elastically deformed toward the surface on the one side. Thereby, the distance between the intermediate plate and the pressing member is reduced, and the gap between the pair of blades can be made closer to the gap of the predetermined dimension. Therefore, even if the pair of blades are worn by using the trimming machine for a long time, the gap between the pair of blades can be adjusted in order to maintain the gap of the predetermined dimension.

  In the embodiment of the trimming machine according to the present invention, preferably, on the distal end side of the pair of blades, the second long hole formed in the pair of blades and the intermediate plate are disposed adjacent to the pressing member. A second fastening member for fastening the second spacing member inserted into the through-hole formed in the outer plate, the second spacing member, and the pressing member on the distal end side, The second spacing member maintains a second predetermined distance between the outer plate and the pressing member on the tip side so as to leave a gap of the predetermined dimension in the pair of blades. The hole has a size that does not prevent elastic deformation of the intermediate plate by the pressing member.

  In the trimming machine configured as described above, on the tip side of the pair of blades, the second spacing member inserted into the long hole of the pair of blades is disposed on the one side of the pair of blades. Since the second predetermined distance is maintained between the outer plate and the pressing member disposed on the other side, the thickness of the pair of blades and the thickness of the intermediate plate are determined from the second predetermined distance. The gap between the pair of blades, which is the remainder of the drawing, can be set to a predetermined dimension that exhibits a good degree of cutting of the pair of blades. Therefore, the pair of blades can be made to have a gap of the predetermined dimension over the longitudinal direction, and the trimming machine can exhibit a better cutting condition.

  In addition, since the second through hole has a size that does not hinder the elastic deformation of the intermediate plate by the push member, the push member is worn when the pair of blades are worn by using the trimming machine for a long time. This does not prevent the clearance of the predetermined dimension from being maintained.

  As described above, the trimming machine according to the present invention can easily set the gap between the pair of blades during assembly, and can adjust the gap between the pair of blades when the pair of blades are worn.

  With reference to the drawings, an embodiment of a trimming machine according to the present invention will be described. 1 is a perspective view of a trimming machine according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the power transmission mechanism of the trimming machine of FIG. 1 viewed from below, and FIG. 3 is a perspective view of FIG. It is the disassembled perspective view which looked at the cutting blade assembly of the trimming machine from the downward direction. FIGS. 4 to 7 are bottom views of the large gear, the eccentric cam, and the connecting rod, respectively, showing the state where the large gear is rotated by 0 degrees, 90 degrees, 180 degrees, and 270 degrees. 8 and 9 are front sectional views of the cutting blade assembly shown in FIG.

  As shown in FIG. 1, a trimming machine 1 according to an embodiment of the present invention includes an engine 2 as drive means, a housing 4 to which the engine 2 is attached, and a cutting blade set extending from the housing 4 in the longitudinal direction A1. It has a solid 6. The cutting blade assembly 6 has a pair of blades 10 and 12 having a plurality of cutting blades 8 along the longitudinal direction A1. The pair of blades 10 and 12 overlap with each other and extend in the longitudinal direction A1, and are configured to slide and reciprocate in the longitudinal direction A1 in the opposite directions in order to cut a garden tree or the like by the cutting blade 8. Has been. The housing 4 is provided at a base end portion 6c of the cutting blade assembly 6, and a power transmission mechanism 14 (see FIG. 2) for reciprocating the pair of blades 10 and 12 is accommodated in the housing 4. Has been. Also, the housing 4 is provided with two handles 16 and 18 for holding the trimming machine 1 by hand. One of the handles 16 is adjusted by adjusting the rotational speed of the engine 2 so that the pair A throttle lever 20 is provided for operating or stopping the reciprocation of the blades 10 and 12.

  In the following description, the side of the housing 4 in the longitudinal direction A1 is referred to as “rear”, and the side of the cutting blade assembly 6 is referred to as “front”. The direction in which the pair of blades 10 and 12 overlap is referred to as the up-and-down direction C1, the side C4 of the engine 2 is referred to as “upper”, and the opposite side C5 is referred to as “lower” (see FIG. 3). A direction perpendicular to the longitudinal direction A1 and the up-down direction C1 is referred to as a lateral direction B1.

  As shown in FIG. 2, the housing 4 has a housing body 4a opened downward and a housing lid 4b. The engine 2 (not shown in FIG. 2) is attached to the upper surface 4c of the housing body 4a via a centrifugal clutch 22, and the power transmission mechanism 14 is connected to an output shaft (not shown) of the centrifugal clutch 22. A fixed small gear 24, a large gear 26 that meshes with the small gear 24, an upper eccentric cam 28 and a lower eccentric cam 30 provided on the large gear 26, and the upper eccentric cam 28 and the lower eccentric cam 30. And an upper connecting rod (connecting rod) 32 and a lower connecting rod 34 for connecting the cutting blade assembly 6 to each other. Further, a plate 36 for supporting the large gear 26 and a felt member 38 for preventing the grease put in the housing 4 from leaking are provided.

  The large gear 26 is rotatably attached to a rotary shaft 40 fixed to the housing 4 and has an upper surface 26a and a lower surface 26b. The upper eccentric cam 28 and the lower eccentric cam 30 disposed eccentrically with respect to the rotating shaft 40 are provided on the upper surface 26a and the lower surface 26b, respectively. The upper eccentric cam 26 a and the lower eccentric cam 26 b are arranged with a phase of 180 degrees with respect to the rotation shaft 40. The upper eccentric cam 26a and the lower eccentric cam are substantially cylindrical.

  The upper connecting rod 32 and the lower connecting rod 34 are disposed on the upper surface 26a and the lower surface 26b of the large gear 26, respectively. The upper connecting rod 32 is pivotable to an annular large end portion 32a slidably fitted around the upper eccentric cam 28 and the upper blade 10 positioned above the pair of blades 10 and 12. An annular small end portion 32b attached to the large end portion 32b, and a connecting portion 32c for connecting the large end portion 32a and the small end portion 32b. Similarly, the lower connecting rod 34 includes an annular large end 34 a slidably fitted around the lower eccentric cam 30, and the lower blade 12 positioned below the pair of blades 10 and 12. And an annular small end portion 34b pivotably attached to the main end portion 34b, and a connecting portion 34c for connecting the large end portion 34a and the small end portion 34b. The upper connecting rod 32 and the lower connecting rod 34 have the same shape, and the connecting portions 32c and 34c are tapered so as to narrow from the large end portions 32a and 34a toward the small end portions 32b and 34b. It has an outline and has a substantially triangular through-hole 42.

  As shown in FIGS. 2 and 3, the cutting blade assembly 6 has an inner portion 6a located in the housing 4 and an outer portion 6b extending from the housing 4 in the longitudinal direction A1. . The outer portion 6b has a rear proximal side 6d where a later-described proximal-side regulating portion 80 is disposed, and a forward distal side 6e where a later-described distal-side regulating portion 82 is disposed. (See FIG. 3). The length of the outer portion 6b is, for example, 600 to 800 mm.

  As shown in FIG. 3, the upper blade 10 and the lower blade 12 overlap each other, and the pair of blades 10, 12 includes an intermediate plate 44 disposed on the upper blade 10 and a presser plate disposed thereon. 46. An outer plate 47 extending in the longitudinal direction A1 is disposed on the distal end side 6e of the intermediate plate 44. In other words, the intermediate plate 44 is disposed between the outer plate 47 and the pair of blades 10 and 12.

  The intermediate plate 44 extends in the longitudinal direction A1 along the pair of blades 10 and 20. The intermediate plate is made of a rigid material such as a metal, but can be elastically deformed in the vertical direction C1 because it extends in the longitudinal direction A1. The intermediate plate 44 has an inner portion 44a fixed in the housing 4 and an outer portion 44b extending from the housing 4 in the longitudinal direction A1. The inner portion 44a has two holes 48 spaced in the longitudinal direction A1, and the two holes 48 are aligned with the female screw portion 4d of the housing 4 (see FIG. 2). .

  The upper blade 10 and the lower blade 12 have inner portions 10a and 12a located in the housing 4, and outer portions 10b and 12b extending from the housing 4 in the longitudinal direction A1. The inner portions 10a and 12a have long holes 50 that are aligned with the two holes 48 of the intermediate plate 44 and extend in the longitudinal direction A1. A collar 52 that fits into the long hole 50 and is fixed to the female screw portion 4d via the intermediate plate 44 is disposed in the long hole 50, whereby the upper blade 10 and the lower blade are arranged. 12 is slidable in the longitudinal direction A1 along the collar 52. The vertical length L1 of the collar 52 is slightly larger than the total thickness W1 of the upper blade 10 and the lower blade 12 (see FIG. 8).

  The pressing plate 46 has an inner portion 46 a located in the inner portion 4 a of the housing 4 and an outer portion 46 b extending from the housing 4 along the longitudinal direction A1. The outer portion 46b of the presser plate 46 is shorter than the outer portions 44b, 10b, 12b of the intermediate plate 44, the upper blade 10, and the lower blade 12, and the inner portion 46a has the two holes 48 and It has holes 54 that align.

  A screw 56 inserted into the hole 54 of the presser plate 46, the collar 52, and the hole 48 of the intermediate plate 44 is screwed into the female screw portion 4d, whereby the presser plate 46 and the collar 52 are inserted. The intermediate plate 44 is fixed to the housing 4 (see FIG. 8). On the other hand, the upper blade 10 and the lower blade 12 positioned between the intermediate plate 44 and the presser plate 46 are guided by the collar 52 and are movable in the longitudinal direction A1.

  The rear end portion 10c of the upper blade 10 is provided with a cylindrical projection 10d that is pivotably fitted to the annular small end portion 32b of the upper connecting rod 32, and the rear end of the lower blade 12 The end 12c is provided with a cylindrical protrusion 12d that is pivotably fitted to the annular small end 34b of the lower connecting rod 34. Thus, when the large gear 26 rotates once by the rotation of the engine 2, the upper blade 10 and the lower blade 12 are moved between the forward position 58 (see FIG. 4) and the reverse position 60 (see FIG. 6). It is configured to reciprocate once. Further, as described above, since the upper eccentric cam 28 and the lower eccentric cam 30 are arranged at a phase of 180 degrees with respect to the rotary shaft 40, the upper blade 10 is moved from the forward movement position 58 to the When moving to the retracted position 60, the lower blade 12 moves from the retracted position 60 to the advanced position 58, and conversely, when the upper blade 10 moves from the retracted position 60 to the advanced position 58, the The lower blade 12 moves from the advance position 58 to the retract position 60.

  A plurality of cutting blades 8 are provided along the longitudinal direction A1 in the outer portions 10b and 12b of the upper blade 10 and the lower blade 12. In this embodiment, the said cutting blade 8 is provided in the both sides with respect to the said longitudinal direction A1, and has the blade part 8c in the front surface 8a and the rear surface 8b.

  The cutting blade 8 moves the upper blade 10 when the upper blade 10 moves from the advanced position 58 to the retracted position 60 and the lower blade 12 moves from the retracted position 60 to the advanced position 58. The cutting blade 8, for example, the cutting blade 8d, is disposed so as to engage with the cutting blade 8, for example, the cutting blade 8e, of the lower blade 12 adjacent to the rear side to perform a cutting action. Further, the cutting blade 8 moves the upper blade 10 when the upper blade 10 moves from the retracted position 60 to the advanced position 58 and the lower blade 12 moves from the 58 advanced position to the retracted position 60. The cutting blade 8, for example, the cutting blade 8 d, is arranged to engage with the cutting blade 8, for example, the cutting blade 8 f, of the lower blade 12 adjacent to the front side to perform a cutting action.

  Next, the eccentric cams 28 and 30 and the connecting rods 32 and 34 will be described with reference to FIGS. FIG. 4 shows the forward movement position 58 where the lower blade 12 has moved most forward, and the rotational direction positions of the large gear 26 and the lower eccentric cam 30 at that time are 0 degrees. 5 to 7 show states in which the large gear 26 and the lower eccentric cam 30 are rotated 90 degrees, 180 degrees, and 270 degrees from the state shown in FIG. Accordingly, FIG. 6 shows the retracted position 60 where the lower blade 12 has moved most backward. The upper eccentric cam 28 and the upper blade 10 have the same configuration as the lower eccentric cam 30 and the lower blade 12 except that the lower eccentric cam 30 and the lower blade 12 are shifted by 180 degrees in phase. ing. Accordingly, only the lower eccentric cam 30, the lower connecting rod 34, and the lower blade 12 will be described below, and illustration and description of the upper eccentric cam 28, the upper connecting rod 32, and the upper blade 10 will be omitted.

  As shown in FIG. 4, the lower connecting rod 34 has a connecting rod axis A2 passing through a central axis C2 of the small end 34b, a central axis C3 of the large end 34a, and the central axis C3 of the large end 34a. And a horizontal axis B2 orthogonal to the central axis C3 of the connecting rod axis A2 and the large end 34a.

  The large end portion 34a has a front receiving portion 68a and a rear receiving portion 68b positioned on the connecting rod axis A2, and horizontal portions 70a and 70b positioned on the horizontal axis B1. The receiving portions 68a and 68b are configured to be deformable in the direction of the connecting rod axis A2. Specifically, the lower connecting rod 34 and the lower eccentric cam 30 are made of iron, and the radial widths T1 and T2 of the receiving portions 68a and 68b are the radial widths T3 and T4 of the lateral portions 70a and 70b. Is preferably smaller.

  Further, the lower eccentric cam 30 has a peripheral notch 72 and a through hole 74 located on the lateral axis B2 when the connecting rod axis A2 and the longitudinal direction A1 are aligned. The peripheral notch 72 has a surface 72a parallel to the connecting rod axis A2 when the connecting rod axis A2 and the longitudinal direction A1 are aligned. The through hole 74 and the peripheral notch 72 form a space 76 for collecting grease between the large end 34 a of the lower connecting rod 34 and the lower eccentric cam 30.

  Next, the cutting blade assembly 6 will be described in detail with reference to FIG. 3, FIG. 8, and FIG. FIG. 8 shows an assembled state in which the pair of blades 10 and 12 are not worn, and FIG. 9 shows a method of adjusting the pair of blades 10 and 12 after the pair of blades 10 and 12 is worn. Show.

  As shown in FIGS. 3 and 8, the cutting blade assembly 6 has a base end that regulates a gap H2 between the upper blade 10 and the lower blade 12 on the base end side 6d of the outer portion 6b. A side regulating portion 80 is provided. The proximal-side regulating portion 80 is inserted into the through hole 80a formed in the intermediate plate 44, the long hole 80b provided in the upper blade 10 and the lower blade 12, and the long hole 80b. A collar 80c penetrating the pair of blades 10, 12, a washer 80d disposed under the lower blade 12, or a through hole 80e of the presser plate 46, a screw 80f, and a lock nut 80g. Yes. The screw 80f is inserted into the washer 80d or the through hole 80e of the presser plate 46, and then passed through the collar 80c and screwed into the female screw portion 80a, whereby the intermediate plate 44, the collar 80c and the washer 80d or the pressing plate 46 are fastened to each other. Further, in order to prevent the screw 80f from loosening, the screw 80f is preferably fastened by the lock nut 80g.

  The vertical length L2 of the collar 80c is also a distance L2 between the intermediate plate 44 and the washer 80d or the presser plate 46, and is slightly smaller than the total thickness W1 of the upper blade 10 and the lower blade 12. Big. Therefore, the intermediate plate 44 and the washer 80d or the presser plate 46 are separated and maintained at the distance L2. Further, the distance L2 is determined such that a gap H2 (= L2-W1) having a predetermined dimension is left in the pair of blades 10 and 12, and thereby the pair of blades 10 and 12 has a good cutting condition. Ensuring sliding movement while demonstrating. The gap H2 is, for example, 0.25 to 0.5 mm.

  Further, the cutting blade assembly 6 has a tip side regulating portion 82 that regulates a gap H3 between the upper blade 10 and the lower blade 12 on the tip side 6e (see FIG. 8). The leading end side restricting portion 82 includes a female screw portion 82 a formed in the outer plate 47, a through hole 82 b formed in the intermediate plate 44, and long holes provided in the upper blade 10 and the lower blade 12. 82c, a collar 82d that passes through the through hole 82b and the long hole 80c, that is, penetrates the pair of blades 10 and 12, a washer 82e disposed under the lower blade 12, and a screw 82f. And a lock nut 82g. After the screw 82f is inserted into the washer 82e, it is passed through the collar 82d and screwed into the female screw portion 82a, whereby the outer plate 47, the collar 80d and the washer 80e are fastened together. Yes. Furthermore, in order to prevent the screw 82f from loosening, the screw 82f is preferably fastened by the lock nut 82g.

  As shown in FIG. 8, the vertical length L3 of the collar 82d is also a distance L3 between the outer plate 47 and the washer 82e, and the total thickness W1 of the upper blade 10 and the lower blade 12 is as follows. The intermediate plate 44 is slightly larger than the sum of the thicknesses W2. Therefore, the outer plate 47 and the washer 82e are separated and maintained at the distance L3. Further, the distance L3 is determined so that a gap H3 (= L3-W1-W2 = L2-W1) of the predetermined dimension is left in the pair of blades 10, 12, so that the pair of blades 10, 12 12 ensures sliding movement while exhibiting a good cutting condition.

  3 and 9, the cutting blade assembly 6 is a pressing member for elastically deforming the intermediate plate 44 toward the upper surface 10e of the upper blade 10 at the distal end side 6e. A push screw 84 is provided. The push screw 84 passes through the outer plate 47 and extends to the upper surface 44 c of the intermediate plate 44. It is screwed into a female thread portion 84a provided on the outer plate, and is fastened with a lock nut 84b to prevent the push screw 84 from loosening. The through hole 82 b of the intermediate plate 44 has a size that does not hinder the elastic deformation of the intermediate plate 44. When the push screw 84 protrudes downward from the outer plate 47, the distance L4 from the lower surface 44d of the intermediate plate 44 to the lower surface 12e of the lower blade 12 decreases, and accordingly, the pair of blades 10 and 12 The gap H4 (= L4-W1) is also reduced (see FIG. 9).

  The push screw 84 is preferably located at least at the distal end portion 6f of the cutting blade assembly 6, and more preferably, the distal end side regulating portion 82 is located adjacent to the push member 84. Furthermore, it is preferable that the distal end side restricting portion 82 is located between the push member 84 and the proximal end side restricting portion 80. In the present embodiment, the two push screws 84 arranged at an interval in the longitudinal direction A 1, the one tip side regulating portion 82 arranged between them, and the front side of the two push screws 84 The one front end side restricting portion 82 arranged on the front side is provided (see FIG. 3).

  As described above, the base end side 6d is a region where the base end side regulating portion 80 is disposed, and the distal end side 6e is a region where the distal end side regulating portion 82 is disposed. The pair of blades 10 and 12 have relatively little wear on the proximal end side 6d and relatively much wear on the distal end side 6e. From the viewpoint of reducing the weight of the trimming machine 1, the length of the distal end side 6e or the outer plate 47 in the longitudinal direction A1 is preferably short, for example, about 150 to 200 mm. Further, from the viewpoint of ensuring the cutting condition of the cutting blade 8, the tip side 6e occupies a range of about 1/3 to about 1/2 of the outer portion 6b of the pair of blades 10, 12 from the tip. May be. In this case, the outer plate 47 is preferably made of a relatively light material such as aluminum.

  Further, in the present embodiment, from the viewpoint of preventing the lateral plate B1 from swinging in the lateral direction B1, the distal end side restricting portion 82 is provided between the two push screws 84 and on the front side of the two push screws. However, when other conventionally known lateral shake preventing means is used, one of the front end side restricting portions 82 may be omitted. In this case, it is preferable to omit the front end side restricting portion 82 on the front side of the two push screws 84.

  Next, operation | movement of the said trimming machine 1 which is embodiment of this invention is demonstrated.

  The small gear 24 and the large gear 26 are rotated by operating the engine 2 and operating the centrifugal clutch 22 by the throttle lever 20 that adjusts the rotation speed thereof. Due to the rotation of the large gear 26, the upper eccentric cam 28 and the lower eccentric cam 30 rotate around the rotating shaft 40 and rotate the large end portions 32a and 32b of the upper connecting rod 32 and the lower connecting rod 34. Move. Accordingly, the small ends 32b and 34b of the upper connecting rod 32 and the lower connecting rod 34 reciprocate the upper blade 10 and the lower blade 12 along the collar 52, that is, in the longitudinal direction A1. Let

  Since the phases of the upper eccentric cam 28 and the lower eccentric cam 30 are shifted by 180 degrees, when the upper blade 10 moves from the retracted position 60 to the advanced position 58, the lower blade 12 moves from the advanced position 58. Move to the retreat position 60. Thereby, the cutting blade 8 (8d) of the upper blade 10 and the cutting blade 8 (8f) of the lower blade 12 perform a cutting action. Subsequently, when the upper blade 10 moves from the advanced position 58 to the retracted position 60, the lower blade 12 moves from the retracted position 60 to the advanced position 58. Thereby, the cutting blade 8 (8d) of the upper blade 10 and the cutting blade 8 (8e) of the lower blade 12 perform a cutting action.

  When the trimming machine 1 is assembled, the collar 80c is inserted into the elongated hole 80b of the pair of blades 10 and 12 in the base end side regulating portion 80, and the collar 80c is inserted into the presser plate 46 or the washer 80d. When sandwiched between the intermediate plates 44 and fastened with the screws 80f, a gap H2 of the predetermined dimension between the pair of blades 10 and 12 is obtained. Further, in the distal end side restricting portion 82, the collar 82d is inserted into the long hole 82c of the pair of blades 10 and 12, and the through hole 82b of the intermediate plate 44, and the collar 82d is connected to the washer 82e and the outer side. When they are sandwiched between the plates 47 and fastened with the screws 82f, the gap H3 of the predetermined dimension between the pair of blades 10 and 12 is obtained. Therefore, it is possible to easily set the gap between the pair of blades 10 and 12 when the trimming machine 1 is assembled. The gaps H2 and H3 having the predetermined dimensions are preferably equal.

  When the pair of blades 10 and 12 are worn out after using the trimming machine 1 for a long period of time, the total thickness W1 of the pair of blades 10 and 12 decreases, and the pair of blades 10 and 12 The gaps H2 and H3 cannot be maintained at a predetermined size. In this case, by reducing the distance L4 from the lower surface 44d of the intermediate plate 44 to the lower surface 12e of the lower blade 12, the gap H4 (= L4-W1) between the pair of blades 10 and 12 is set to a predetermined dimension. Can be maintained. Specifically, the intermediate plate 44 is elastically deformed downward by screwing the push screw 84 into the female screw portion 84 a of the outer plate 47 and projecting the push screw 84 from the lower surface 47 a of the outer plate 47. Let Thereby, the gap H4 between the pair of blades 10 and 12 can be maintained at a predetermined size for a long period of time.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims. Needless to say, these are also included within the scope of the present invention.

  In the above-described embodiment, the two push screws 84 and the two tip side regulating members 82 are provided, but the number thereof is arbitrary.

  In the above embodiment, nothing is provided between the intermediate plate 44 and the upper blade 10, but a spacer for preventing the intermediate plate 44 from being worn may be provided between them. . For example, the spacer is preferably provided when the intermediate plate 44 is formed of a relatively soft material such as aluminum.

  Moreover, in the said embodiment, the said lock nut 80h, 82h, 84b is used for the looseness of the said screw 80g of the said base end side control part 80, the said screw 82g of the said front end side control part 82, and the said push screw 84. However, other methods may be used.

  Further, the outer plate 47 may be protruded from the intermediate plate 44 at the distal end portion 6f, and the trimming operation may be performed while the outer plate 47 is in contact with a building or the like.

  In the above embodiment, both the upper blade 10 and the lower blade 12 are reciprocated, but only one of them may be reciprocated.

It is a perspective view of the trimming machine which is embodiment of this invention. It is the disassembled perspective view which looked at the power transmission mechanism of the trimming machine of FIG. 1 from the downward direction. It is the disassembled perspective view which looked at the cutting blade assembly of the trimming machine of FIG. 1 from the downward direction. It is a bottom view of a large gear, an eccentric cam, and a connecting rod at a position of 0 degree. It is a bottom view of a large gear, an eccentric cam, and a connecting rod at a position of 90 degrees. It is a bottom view of a large gear, an eccentric cam, and a connecting rod at a position of 180 degrees. It is a bottom view of a large gear, an eccentric cam, and a connecting rod at a position of 270 degrees. It is front sectional drawing of the cutting blade assembly of the trimming machine of FIG. It is front sectional drawing of the cutting blade assembly of the trimming machine of FIG.

Explanation of symbols

1 trimming machine 2 engine (drive means)
6c Base end portion 6d Base end side 6e Tip end side 6f Tip end portion 10 Upper blade (a pair of blades)
12 Lower blade (a pair of blades)
44 Intermediate plate 44c Upper surface 46 Presser plate (presser member)
47 Outer plate 80a Female thread portion (first fastening means)
80b long hole (first long hole)
80c collar (first spacing member)
80d washer (presser member)
80f screw (first fastening means)
82a Female thread portion (second fastening means)
82b Through hole 82c Long hole (second long hole)
82d collar (second spacing member)
82e Washer (presser member)
82f screw (second fastening means)
84 Screw (Pushing member)
A1 Longitudinal direction C4 Up direction (one side)
C5 downward (the other side)
H2 gap H3 gap L2 distance (first predetermined distance)
L3 distance (second predetermined distance)

Claims (2)

A pair of blades (10, 12) extending overlapping each other in the longitudinal direction (A1), and the pair of blades (10, 12) provided at the base end (6c) of the pair of blades (10, 12) ) Having a drive means (2) for reciprocally sliding each other,
An outer plate (47) disposed on one side (C4) with respect to the pair of blades (10, 12);
A pressing member (46, 80d, 82e) disposed on the other side (C5) with respect to the pair of blades (10, 12);
An intermediate plate (44) disposed between the outer plate (47) and the pair of blades (10, 12) and extending in the longitudinal direction (A1);
Further, on the base end side (6d) of the pair of blades (10, 12), the first long hole (80b) formed in the pair of blades (10, 12) is inserted, and the pair of blades (10, 12) The base end side so as to leave a gap (H2) of a predetermined dimension in the pair of blades (10, 12) that allows the blades (10, 12) to slide while exhibiting a good cutting condition. A first spacing member (80c) for maintaining a first predetermined distance (L2) between the pressing member (46, 80d) of (6d) and the intermediate plate (44);
There are first fastening means (80a, 80f) for fastening the intermediate plate (44), the first separation member (80c), and the pressing member (46, 80d) on the base end side (6d) to each other. And
Further, at the tip end portion (6f) of the pair of blades (10, 12), the outer plate (47) penetrates to the surface (44c) on the one side (C4) of the intermediate plate (44). A pressing member (84) for elastically deforming the intermediate plate (44) toward the surface (10e) on the one side (C4) of the pair of blades (10, 12). A trimming machine. On the tip side (6e) of the pair of blades (10, 12), a second long hole (82c) is formed adjacent to the push member (84) and formed in the pair of blades (10, 12). ) And a second spacing member (82d) inserted through a through hole (82b) formed in the intermediate plate (44),
Second fastening means (82a, 82f) for fastening the outer plate (47), the second spacing member (82d), and the pressing member (82e) on the distal end side (6e) to each other;
The second spacing member (82d) is a pressing member on the outer plate (47) and the distal end side (6e) so as to leave the gap (H3) of the predetermined dimension in the pair of blades (10, 12). (82e) is maintained at a second predetermined distance (L3), and the second through hole (82b) does not hinder the elastic deformation of the intermediate plate (44) by the pressing member (84). The trimming machine according to claim 1, wherein the trimming machine has a thickness.

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