JP4796979B2 - Trimming machine - Google Patents

Description

  The present invention relates to a trimming machine for cutting twigs such as hedges.

  The cutting blades of conventional mowers have the same spacing between the cutting edges of the upper and lower cutting edges made up of a plurality of cutting edges. Is dispersed, the cutting force per cutting edge is reduced, and the sharpness is lowered. On the other hand, since a large cutting load is applied to a drive source such as a motor at a time, the life is shortened. In addition, since the cutting blade extends long in front of the tool body, the center of gravity of the trimming machine is generated on the side of the cutting blade, and the operator who operates with the handle provided at the rear end of the tool body tends to carry weight and become easily fatigued. was there.

In order to solve this problem, the blades of one of the cutting blades are formed at equal intervals, and the blades of the other cutting blade are aligned with the equally spaced blades every other blade and 2 A technique has been considered in which blades are alternately formed with a wide blade interval and a narrow blade interval of approximately 3 mm to two blades alternately.
However, even with the above technique, it is possible to shift the cutting timing between the cutting blade and the blade in three stages. Not only can the cutting timing be shifted to three or more stages, but the center of gravity position of the cutting blade The weight was not improved because there was no change.
Japanese Utility Model Publication No. 56-86971

  The problem to be solved is that the cutting timing of the cutting blade of the mowing machine and the cutting timing of the cutting edge are shifted more, thereby reducing the cutting load on the drive source, etc., and improving the durability of the mowing machine By improving the sharpness of the cutting edge and further bringing the center of gravity of the trimming machine closer to the handle, the weight is improved and the operability is improved.

According to the first aspect of the present invention, an upper blade ( 5 ) and a lower blade ( 6 ) each having a plurality of cutting blades (51, 61 ) formed on a front portion of a tool body (2) are overlapped to form a cutting blade ( 3) together constituting, in the tool body (2) is linear reciprocating motion the upper and lower blade lever (5, 6) by receiving the driving source to cut the object to be cut with hedge clipper (1), upper blade rod ( 5) The intervals (A1,..., A7) of the cutting blade (51) and the intervals (B1,..., B7) of the cutting blade (61) of the lower blade ridge (6) are the same, and The intervals (A1,..., A8, B1,..., B7) of the cutting blades (51, 61) of the blade rod (5, 6) are gradually increased from the tool body (2) side toward the tip. It is characterized by that.

In the invention according to claim 2, the cutting blade (9) and the lower cutting blade (10) are overlapped with the upper cutting blade (9, 101) formed with a plurality of cutting blades (91, 101) at the front portion of the tool body (2). 30) and a cutting machine (1) that cuts the workpiece by linearly reciprocating the upper and lower blades (9, 10) with a drive source housed in the tool body (2). The interval (B) between the cutting edges (101) of (10) is made equal, and the intervals (A1,..., A8) between the cutting edges (91) of the other blade rod (9) are the tool body (2) side. The distance (A5) between the cutting blades (91), which is gradually increased from the tip toward the tip and is located approximately in the middle in the longitudinal direction of the other blade rod (9), is set to the cutting blade ( 101) is the same as the interval (B) .

According to the invention of claim 1 , since the cutting timing of all the cutting blades of the mowing machine and the cutting blades are shifted, the cutting load on the drive source and the like is reduced, and the durability of the mowing machine is further improved. In addition, the sharpness of the cutting edge is improved. Further increases in the upper and lower blade lever number tool body side of the cutting edge of which constitutes a cutting edge, increasing the weight of the tool body side cutting edge, because hedge clipper overall center of gravity closer to the handle, Mochiomori improvements Therefore, the operability is further improved.

According to the invention of claim 2 , not only the cutting timing of the cutting blade of the cutting machine and the cutting timing of the cutting blade are shifted, but also the tool main body side and the tip end side centering on the cutting blade located substantially at the center of the blade hook. Therefore, the vibration generated by the cutting is balanced between the tool body side and the tip side of the blade and the operability is improved.

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

  FIG. 1 is a plan view of a trimming machine according to a first embodiment of the present invention. FIG. 2 is a plan view of the cutting blade of the trimming machine of the first embodiment, showing the configuration of the cutting blade on one side of the blade hook.

  As shown in FIG. 1, the trimming machine 1 of the present invention includes a cutting blade 3 for cutting a branch such as a hedge on the tip side (right side in the figure) of the tool body 2, and an operator grips the rear side. A handle 4 is provided integrally. A motor (not shown) that is a drive source for driving the cutting blade 3 is housed inside the tool body 2.

  The cutting blade 3 is composed of an upper blade rod 5 and a lower blade rod 6 formed with a plurality of cutting blades 51 and 61 on both sides (upper and lower in FIG. 1), and is fixed to a blade pressing plate 7 and a blade not shown. It is supported by the board.

  As shown in FIG. 2, the upper and lower blades 5 and 6 constituting the cutting blade 3 are engaged with a cam 8 connected to an output shaft of a motor (not shown) as a drive source, and the cam 8 rotates. Perform linear reciprocating motion. The cam 8 includes two eccentric cams 8a and 8b which are arranged vertically and symmetrically in the vertical direction in FIG. 2 and are integrally formed perpendicularly to the paper surface of FIG. A hole 52 of the upper blade rod 5 is engaged with the eccentric cam 8a, and a hole 62 of the lower blade rod 6 is engaged with the other eccentric cam 8b. As the cam 8 rotates, the upper and lower blades 5 and 6 linearly reciprocate in different directions to cut a hedge twig or the like that has entered between the cutting blades 51 and 61.

In this embodiment, since the cam 8 rotates to the right about the rotation center O from the state shown in FIG. 2A, the upper blade rod 5 is straight in the left direction in the drawing and the lower blade rod 6 is straight in the right direction in the drawing. It moves and cuts twigs and the like that have entered between the cutting edges 51 and 61 of the upper and lower blades 5 and 6.
FIG. 2B shows a state where the cam 8 is rotated by 180 degrees from the state of FIG. When the cam 8 further rotates to the right from this state, the upper blade rod 5 moves in the right direction in the figure and the lower blade rod 6 moves in the left direction in the drawing, and between the cutting blades 51 and 61 of the upper and lower blade rods 5 and 6. Cut the twigs that have entered.
In this way, one turn is performed each time the upper and lower blades 5 and 6 go and return by one rotation of the cam 8.

Next, the configuration of the cutting blades 51 and 61 of the upper and lower blades 5 and 6 in this embodiment will be described with reference to FIG.
As shown in this figure, the distances A1, A2, A3, A4,..., A7, A8, B1, B2, B3, B4,. A1 = p, A2 = p + c, A3 = p + 2c, A4 = p + 3c,..., A7 = p + 6c, A8 = p + 7c, B1 = p, B2 = p + c, B3 = p + 2c, B4 = p + 3c,..., B7 = p + 6c, so that the quantitative value c is gradually increased.
As described above, the distances A1, A2, A3, A4,..., A7, A8, B1, B2, B3, B4,. Since the position of the center of gravity of the cutting blade 3 is closer to the tool body 2 side than the center position in the longitudinal direction and the overall center of gravity position of the cutting machine 1 is closer to the handle 4, The weight when the operator holds the handle 4 is improved, the operability is improved, and the operator's fatigue is reduced.

Further, the intervals A1, A2, A3, A4,..., A7, A8 of the cutting blades 51 of the upper blade 5 and the distances B1, B2, B3, B4,. B7 and A7 are formed in the same dimensions as A1 = B1, A2 = B2, A3 = B3, A4 = B4,..., A7 = B7.
And the position where the upper and lower blades 5 and 6 for starting the cutting are overlapped is, as shown in FIG. 2A, the interval B4 between the cutting blades 61 formed at the center position in the longitudinal direction of the lower blade 6. Of the two cutting blades 61 and 61 to be formed, a cutting blade 61 (E in the figure) on the tool body 2 side is formed at a substantially central position in the longitudinal direction of the blade 5 and is the same as the interval B4 of the cutting blade 61. They are overlapped by being positioned in the middle of the interval A4 of the cutting blades 51 formed in the dimensions. That is, the lower blade rod 6 is shifted and overlapped with the upper blade rod 5 toward the tip side.

When the cutting blade 3 composed of the upper and lower blades 5 and 6 is configured as described above, for example, the eccentric amount a of the eccentric cams 8a and 8b is 7.5 mm, and the distances A1 and B1 between the cutting blades 51 and 61 are p = 27. When the upper and lower blades 5 and 6 shown in FIG. 2A start cutting when the fixed value c is .25 mm and the fixed value c is 0.25 mm, the distance between the cutting blade 51 and the cutting blade 61 indicating the cutting timing. Are w1 = 13.25 mm, w2 = 13.5 mm, w3 = 14 mm,..., W7 = 14.75 mm, w8 = 15 mm.
Therefore, if it is assumed that a twig having the same thickness is to be cut, the cutting timing is sequentially shifted so that the cutting starts earliest in the interval w1 and latest in the interval w8. The cutting load by all the cutting blades 51 and 61 is not applied at one time, the load gradually increases, the maximum load decreases, and the durability of the trimming machine 1 is improved. Furthermore, the sharpness of the cutting blades 51 and 61 is improved.

In this embodiment, as shown in FIG. 2B, when the upper and lower blades 5 and 6 move in the opposite direction to the case of FIG. The intervals w9 between 51 and 61 all have the same dimensions, and the cutting timings are all simultaneous.
This is the positional relationship between the upper and lower blades 5 and 6 when the upper and lower blades 5 and 6 are superposed on the cutting start state (the state shown in FIG. 2A). The cutting blade 61 on the tool body 2 side of the two cutting blades 61 forming the interval B4 between the cutting blades 61 formed at the central position of the cutting blade 61 is formed at a substantially central position in the longitudinal direction of the blade 5, In the case where the cutting blades 51 formed to have the same dimensions as the interval B4 are overlapped and positioned in the middle of the interval A4, the cutting timing shown in FIG. 2 is obtained.
Conversely, the cutting blade 51 on the tool body 2 side of the two cutting blades 51 forming the interval A4 between the cutting blades 51 formed at the substantially central position in the longitudinal direction of the upper blade rod 5 is set to the approximate center in the longitudinal direction of the blade rod 6. When the upper blade rod 5 shown in FIG. 2 (a) is placed in the middle of the interval B4 of the cutting blade 61 formed in the position and overlapped with the interval B4 of the cutting blade 61 formed to the same size as the interval A4 of the cutting blade 51, When the lower blade rod 6 moves to the right in the drawing, the intervals between the cutting blades 51 and 61 for cutting are all the same size w9, and the cutting timings are all simultaneous. When the upper blade 5 shown in FIG. 2B moves to the right in the drawing and the lower blade 6 moves to the left in the drawing, the interval between the cutting blade 51 and the cutting blade 61 indicating the cutting timing changes in order. Go.
Therefore, as shown in FIG. 1, in the drawing, the left-right positional relationship between the lower cutting blade 52 and the cutting blade 62 of the upper and lower blades 5 and 6 is the same as the left-right positional relationship between the upper cutting blade 51 and the cutting blade 61. Is reversed, the cutting timing of the upper cutting blades 51 and 61 is shifted by the movement of the upper and lower blades 5 and 6 in one direction, and the cutting timing is the same for the lower cutting blades 52 and 62. 3 can be configured.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a plan view of the cutting blade of the trimming machine of the second embodiment, showing the configuration of the cutting blade on one side of the blade hook. In addition, since it is the same as that of the 1st Example except a cutting blade, illustration and description are abbreviate | omitted.

As shown in FIG. 3, the cutting blade 30 of the second embodiment is configured by superposing an upper blade rod 9 and a lower blade rod 10 formed with a plurality of cutting blades 91, 101 on both sides (only one is shown). Then, a linear reciprocating motion is performed by the rotation of the cam 8. As in the first embodiment, the cam 8 is arranged so as to be vertically symmetrical in FIG. 3 and shifted by an equally spaced eccentricity a, and is formed integrally with two eccentric cams vertically stacked on the paper surface of FIG. 8a and 8b, the hole 92 of the upper blade 9 is engaged with one eccentric cam 8a, and the hole 102 of the lower blade 10 is engaged with the other eccentric cam 8b. When the cam 8 rotates about the rotation center O, the upper and lower blades 9 and 10 perform linear reciprocation in different directions to cut a twig such as a hedge that has entered between the cutting blades 91 and 101.
In the second embodiment, the upper blade 9 has intervals A1, A2, A3, A4, A5,..., A8 of the cutting blade 91 from the tool body 1 side to the tip, and A1 = p, A2 = It is formed so as to be gradually larger by a quantitative value c such as p + c, A3 = p + 2c, A4 = p + 3c, A5 = p + 4c,..., A8 = p + 7c.
As described above, since the intervals A1, A2, A3, A4,..., A8 of the cutting blade 91 of the upper blade 9 gradually increase from the tool body 2 side toward the tip, the gravity center position of the cutting blade 30 Is closer to the tool body 2 than the center position in the longitudinal direction, and the overall center of gravity of the trimming machine 1 is closer to the handle 4, so the weight when the operator holds the handle 4 is improved and the operability is improved. Worker fatigue is reduced.

On the other hand, the lower blade rod 10 has its cutting blades 101 formed at equal intervals at intervals B. And this space | interval B and the space | interval A5 of the cutting blade 91 located in the approximate middle of the longitudinal direction of the said upper blade rod 9 are set to the same dimension.
Then, the upper and lower blades 9 and 10 have one cutting blade 101 (F in the drawing) formed at a substantially central position in the longitudinal direction of the lower blade rod 10 in FIG. The upper blade 9 is positioned approximately in the middle of the longitudinal direction and overlapped with an interval A5 having the same dimensions as the interval B of the cutting blade 101 of the lower blade 10.

When the cutting blade 30 composed of the upper and lower blades 9 and 10 is configured as described above, for example, the eccentric amount a of the eccentric cams 8a and 8b is 7.5 mm, and the interval B between the cutting blades 101 of the lower blade 10 is 28 mm. When the interval A1 between the cutting edges 101 of the upper blade 9 is p = 27 mm, A5 is p + 4c = 28 mm, and the quantitative value c is 0.25 mm, the upper and lower blades 9 and 10 shown in FIG. In the starting state, the intervals between the cutting edge 91 and the cutting edge 101 indicating the cutting timing are v1 = 15.5 mm, v2 = 14.75 mm, v3 = 14.25 mm, v4 = 14 mm, v5 = 14 mm, v6 = 14. .25 mm, v7 = 14.75 mm, and v8 = 15.5 mm.
Therefore, when it is assumed that a twig having the same thickness is cut, the cutting timings are sequentially arranged in the left-right direction in the figure with the interval v4, v5 between the cutting edge 91 and the cutting edge 101 between the upper and lower blades 9, 10 as the center. Since the motor is a driving source, the cutting load by all the cutting blades 91 and 101 is not applied at a time, the load is gradually increased, the maximum load is decreased, and the trimming machine 1 is durable. Improves. Further, the sharpness of the cutting edges 91 and 101 is improved.
In addition, since the cutting timing is sequentially delayed toward the tool body 2 side and the tip side centering on the cutting blades 91 and 101 positioned substantially at the center of the blade rods 9 and 10, vibration generated by cutting is caused by the tool body of the blade rod. The balance between the two sides and the tip side is balanced and the operability is improved.

Next, in this second embodiment, as shown in FIG. 3B, when the upper and lower blades 9 and 10 move in the opposite direction to the case of FIG. The intervals between the cutting edge 91 and the cutting edge 101 indicating the timing are v9 = 11.5 mm, v10 = 12.5 mm, v11 = 13.25 mm, v12 = 13.75 mm, v13 = 14 mm, v14 = 14 mm, v15 = 13. 75 mm and v16 = 13.25 mm.
Accordingly, the cutting timing is shifted in the left-right direction in the figure with the interval v13, v14 between the cutting edge 91 and the cutting edge 101 approximately in the middle of the upper and lower blades 9, 10 being shifted to the motor as a driving source. The cutting load by all the cutting blades 91 and 101 is not applied at one time, the load gradually increases, the maximum load decreases, and the durability of the trimming machine 1 is improved. Further, the sharpness of the cutting edges 91 and 101 is improved.
As described above, in the second embodiment, when the upper and lower blades 9 and 10 are moved in either the left or right direction, the cutting timing is sequentially shifted, and the operability is further improved.

  As another embodiment, the configuration of the cutting blades 91 and 101 of the upper and lower blades 9 and 10 shown in the second embodiment is the configuration of the lower cutting blade in the drawing of the cutting blade 3 shown in FIG. It may be adopted.

It is a top view of the trimming machine of the 1st Example of the present invention. It is a top view which shows the structure of the cutting blade of the cutting machine of the 1st Example of this invention. It is a top view which shows the structure of the cutting blade of the trimming machine of the 2nd Example of this invention.

Explanation of symbols

1 Cutting machine 2 Tool body 3 Cutting blade 4 Handle 5 Upper blade ６ 6 Lower blade 杆 51, 61 Cutting blade

Claims (2)

With forming the cutting blade by superimposing the blade lever and the lower blade rod on which is formed a plurality of cutting edges on the front of the tool body, by linear reciprocating motion of the upper and lower blade lever by a drive source housed in the tool body In a trimming machine that cuts the workpiece, the distance between the cutting edges of the upper and lower blades is the same, and the distance between the upper and lower blades is set from the tool body side to the tip. A trimming machine characterized by being gradually enlarged. A cutting blade is constructed by superposing upper and lower blades with multiple cutting edges on the front of the tool body, and the upper and lower blades are reciprocated linearly by a drive source stored in the tool body. In a trimming machine that cuts an object to be cut, the interval between the cutting edges of one blade is set to be equal, and the interval between the cutting edges of the other blade is gradually increased from the tool body side toward the tip, A trimming machine characterized in that the interval between the cutting blades located approximately in the middle of the longitudinal direction of the blade rod is the same as the interval between the cutting blades of the one blade rod .

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