JPS60137214A - Reamer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a pruner used for cutting branches, etc.

(Background Art) Conventionally, in this yuzu cutting machine, a comb-shaped movable blade is slid back and forth on a comb-shaped fixed blade at a constant speed, and as shown in FIG. 11' comb blade 10a
The branch 16 that has entered between the comb blades 10c' and 11a' is cut, and at this time, arc-shaped uneven parts 10c' and 10d' are formed on the side walls of the comb blade 10a' with a fixing force of 10'. Some combs were constructed in such a way that the branches 16 that had entered the grooves would not escape outward from the comb blades.

In this case, the branch 16 having a radius R which is larger than the radius r of the recess is supported by walls A and B of the m wall of the recess 10c' and does not move, so the comb blade 11a' of the movable blade 11' When cutting the branch 16, the cutting impact load becomes large between the contact point C of the branch 16 and the movable blade 11', and the motor that slides the movable blade 11' back and forth is overloaded and the rotation speed decreases. This had the disadvantage that branches could not be pruned efficiently.

(Object of the Invention) The present invention has been proposed in view of the above points, and its object is to provide a comb-shaped fixed blade, a comb-shaped movable blade that comes into sliding contact with the identified blade, and a fixed blade comb. 1111 In a mowing machine with a blade having an uneven portion formed on the wall of the blade, an identification blade having an uneven portion formed on the side wall of the comb blade is movable in a direction crossing the sliding direction of the movable blade, The mowing machine is characterized in that the arc-shaped concave portion on the side wall of the comb blade can reduce the impact load when cutting branches with a large radius, and mowing can be performed efficiently without reducing the rotational speed of the motor. is to provide.

(Disclosure of invention) Hereinafter, the invention will be explained along with the drawings.

Figures 2 to 8 show a further embodiment of the present invention.
In non-invention, riII'1 foot blade 1o is foot motion 1o1
The fixed blade 1o is configured to be movable in a direction crossing the reciprocating direction, and the means for moving the fixed blade 1o is built into the main body and is an eccentric cam.

9B, and the feature M is that the amount of movement is smaller than that of a reciprocating movement key of a movable blade.

That is, FIG. 2 is an overall perspective view of the mowing machine according to the invention, No. 3M is a partial vertical sectional view, and FIG. 4 is a partial perspective view showing the reeds,
In these figures, l is the housing body of the trimmer, which is provided with a roughly mouth-shaped grip part 2 at the front and a handle 4 having a switch part 3 at the rear. A drive phase motor 6 is built in the protruding part 5 that protrudes from the front part 5a.
Inside, there is a pinion 7 provided with a motor shaft 6alC that converts the rotational movement of the motor 6 into forward and backward movement, intermediate gears 14 and 15 that mesh with this pinion 7, an eccentric gear 9 supported by the shaft 8, and this gear. A drive mechanism including eccentric cams 9A, 9B, etc. formed on the upper and lower surfaces of 9, respectively, is built-in.

1O is a fixed blade having a large number of comb-shaped blades 10a, and the base end Ob is attached to the lower side of the housing body 1. The side wall of the comb blade 10a of this fixed blade 1() is formed with a concave portion 10c and a convex portion 10d, forming an arc shape, and on top of this fixed blade 10 is a comb-shaped comb blade having a large number of comb blades 11a. The movable blades 110' are stacked so as to be able to reciprocate and slide, and are covered by a protective cover 12. Furthermore, a -1 constant force guide plate 13 is attached to the lower part of the base side of the fixed blade 10. The fixed blade 10 has a W# shape and is movable in a direction intersecting the reciprocating sliding direction of the movable blade 11.

That is, in FIG. 3, the rotation of the motor 6 is caused by the rotation of the motor 6 from the pinion 7 provided on the motor shaft 6a to the intermediate gears 14, 15.
Eccentric cams 9A and 9B are integrally formed at the upper and lower parts of the eccentric gear 9, respectively, and the movable blade 1 is connected to the eccentric cams 9A and 9B, respectively.
1. Drive holes 11C110e (see FIGS. 6 and 7) formed in the base end portions 11b and 10b of the identification blade 10 are fitted.

Note that a fixed ffN guide plate 13 for guiding the identification blade 1o is provided at the lower part of the housing body 1, and a fixed blade 1 is provided at the upper part of the fixed ffN guide plate 13 for guiding the identification blade 1o.
3 is installed.

FIGS. 5(a) to 5(e) show details of the eccentric gear 9, in which a shaft hole 9a is formed in the center part, a gear part 9b is formed in the outer part, and An eccentric cam 9A is formed protruding from one side, and an eccentric cam 9B is formed on the other side of one side. In other words, the eccentric cam 9A.

9B are formed at positions substantially offset from each other to the left and right in the upper and lower directions. In this case, the eccentric grave of the eccentric cam 9B is smaller than the eccentric cover of the eccentric cam 9A, and therefore the shaft hole 9a of the eccentric gear 9 that penetrates the eccentric cam 9B is smaller than the eccentric cam 9A. It penetrates into the slightly central WC of 9B.

FIGS. 6 and 7 show the zero-working blade 11 and the identification blade lO, and the longitudinal main body 11d of the movable blade 11 has a reciprocating blade extending along its length, that is, along the sliding direction of the movable blade. A guide hole 11e for movement is formed, and the base end 11
The drive hole 11c formed in the guide hole 11c extends perpendicularly 11 to the guide hole 11e and has a horizontally elongated substantially elliptical shape. The long main body 10f of the fixed blade 10 is formed with an elongated guide hole 10g that extends perpendicularly to the length direction of the main body 10f, that is, intersecting the sliding direction of the movable blade, and the base end @Hob The drive hole 10e formed in the fixed blade 10 extends along the length of the fixed blade 10 and has a substantially elliptical shape.

Next, the present invention will be explained in detail.

Now, as shown in FIG. 8 (1), the movement of the movable blade 11,
When the center A of the eccentric cam 9A fitted to the worker 11c is located at the left end with respect to the shaft 8, the eccentric cam 9A is located at the left end of the movable force worker 11c, but the fixed blade 10 The center of the eccentric cam 9B connected to the shaft 8 is located at the right end with respect to the shaft 8, and the eccentric cam 9B is located at the center of the fixed blade drive hole 1 (le The comb blade Oa of the fixed blade 10 is located at the right end of the amplitude in the direction perpendicular to the sliding direction of the movable blade 11.

Then, when the branch 16 is introduced between the movable blade 11 and the fixed blade 10, and the eccentric gear 9 rotates 90 degrees clockwise, the eccentric cam 9
The center A of A is located above the shaft 8 and the drive hole 1
1c, while the center B of the eccentric cam 9B is located below the shaft 8 and at the lower end of the drive hole toe, as shown in FIG. 8(2). At this time, movable, 9
11 slides in the direction a, and the comb blade 11 a tI'i, the comb blade 1. At the same time as Oa overlaps, the fixed blade 10 slides in the direction b and moves to the middle of the amplitude to cut the branch 16. The branch 16 is cut by the movable blade 11 and at the same time moves in the direction b, so it is cut. Cutting can be performed efficiently without applying an impact load to the motor 6 and without reducing the motor rotation speed. That is, if the branch 16 is larger than the recess 10c of the fixed blade 10a and is difficult to cut, when the fixed blade 10 protrudes and moves,
Since the branch 16 is allowed to escape, a large load is prevented from being applied to the motor during cutting.

When the eccentric gear 9 further rotates 90 degrees clockwise, the center A of the eccentric cam 9A is located at the right end of the shaft 8 and the right end of the drive hole 11c, while the center B of the eccentric cam 9B is located at the right end of the drive hole 11c. The left end of the drive hole 1. At this time, the comb blade 11a of the movable blade 11 moves in the a/force direction, and the fixed blade 8
The comb blade 10a of the fixed blade IO moves in the b' direction in the middle of the groove and is located at the left end of the amplitude, and the branch 1G is located between the movable blade 11 and the fixed blade IO, as shown in FIG. be introduced.

When the eccentric gear 9 further rotates 90' to the right, the center A of the eccentric cam 9A is located below the shaft 8, that is, in the middle of the drive hole 11e, while the center B of the eccentric cam 9B is located on the shaft 8. 8, that is, at the upper end of the drive hole 10e, and at this time, the comb blade 11a of the movable blade 11a moves in the direction a'' and overlaps the comb blade 10a of the fixed blade 10, and the fixed blade The comb blade 10a of lO moves in the b// direction and is located in the middle of the amplitude, as shown in No. 8E (4). At that time, the branch 16 moves in the same way as explained in the case of Fig. 8 (2). is cut off.

When the eccentric gear 9 further rotates to the right by 90'', the state returns to the state shown in FIG.
Move in the j direction and cut the branch 16. At this time, fixed blade l
The amount of movement of O may be smaller than the amount of movement of the movable blade 11, and may be a movement amount that softens the impact caused when cutting branches. For example, when the movable blade 11 moves by 19 mm, l,! if fixed blade 1
0 may be about 5III+.

9 and 10 show other embodiments of the invention. In this embodiment, the means for moving the identification blade, which has arc-shaped uneven parts formed on the side wall of the comb blade, in a direction crossing the reciprocating direction of the movable blade 11 is the comb blade part of the hard W blade 20. 21
The outer foot of the yurt provided between the blade base n and the fixed blade base n is configured to be moved by a component of the shear force when cutting the branch, and when the branch 16 is moved by the component of the shear force when cutting the branch, the branch 16 is moved by the movable blade 11 By moving in a direction that intersects the reciprocating direction, the cutting shock load when cutting branches can be reduced, branches can be cut without reducing the rotation speed of the motor, and branches can be trimmed efficiently. Shoulders.

In other words, as shown in Figure 9 (OL), the fixed cutting edge is l.
l! ll, between the 9 part 21 and the longitudinal fixed blade base 22, a substantially rectangular recess 22a extending perpendicularly to the length direction of the fixed blade base 22 is formed at intervals. ing. The side walls of the comb blades 21 a of the comb blade portion 21 extending in mutually opposite directions are provided with a recess 21 b and a convex portion 21 c.
is formed, and a protrusion 21 d protruding outward is formed in the center portion corresponding to the root of the comb blade portion 21 . And 4! r (2) sword 21 a is fixed blade base 22
The comb blade portion 21 is inserted into the recessed portion 2 so as to protrude from both sides of the comb blade portion 2, respectively.
28 yen, and a spring 23 is provided between the protrusion 21 d and the step 22 b defining the recess 22 a.
has been reduced. That is, springs 23 are provided at each of the four corners of the recess 22 a, and the comb blade portion 21 is supported by these springs 23. In addition, the comb blade part 21
As shown in figure (b), 2 has a substantially T-shape.
It is also possible to use a unit in which the roots of the comb blades 21a having a split structure face each other and come into contact with each other and are integrated.

In addition, screw holes 22c are provided at appropriate locations on the fixing force base 22.
is formed, a screw 24 is inserted from below, and the movable force 11 is attached to the fixed blade base 22 through an elongated guide hole 11e, a washer 25, and a nut 26 so as to be able to reciprocate and slide. .

In this embodiment, the eccentric gear 9 (see FIG. 8) includes only an eccentric cam 9A connected to the movable blade 11.
The base end 10b of the fixed blade 1O is appropriately fixed to the fixed blade mounting plate 13 or the lower part of the housing body 1 (see FIG. 3). The other configurations are similar to those of the previous embodiment.

Next, the operation of this embodiment will be explained.

The comb blade part 21 is fitted into the recessed part 228 of the hard red blade base 22, and the comb blade 21a protrudes to the outside. It can be moved freely.

As shown in FIG. 1θ (1), a thick branch 16 is now introduced between the movable blade 11 and the fixed blade 20, and the branch 16 is attached to the side wall of the comb blade 21a of the fixed blade 20. At the same time, the comb blade 11a of the movable blade 11 begins to cut the comb 16, but at this time, as shown in Figure (2), the auxiliary force 21a of the fixed blade is applied to the comb 16K. The movable blade moves in the direction a against the spring force by the component force F' of the cutting blade F, which suppresses the cutting impact load, prevents overload from being applied to the motor, and prevents the motor rotation speed from decreasing. Branches can be pruned efficiently.

(Effects of the Invention) As described above, the present invention includes a comb-shaped fixed blade and a comb-shaped movable blade that is provided in sliding contact with the fixed sumo wrestler and reciprocates in the length direction, In the mowing machine in which an uneven portion is formed on the wall of the comb blade of the fixed leg, the fixed blade is connected to a drive means and configured to be movable in a direction intersecting the reciprocating direction of the movable blade. , h leg comb blade 11
1Il When cutting a branch with a large radius of the recessed part of the wall, the g# impact load during cutting can be softened by moving the branch in the direction that intersects the reciprocating direction of the movable blade.
It is possible to prevent the rotation speed from decreasing due to overload applied to the motor, and has the effect of efficiently trimming branches.

[Brief explanation of drawings]

FIG. 1 shows a conventional example, FIGS. 2 to 8 show an embodiment of the present invention, FIG. is a partial perspective view, Figure 5 (
a) to (e) are top, 110, and bottom views of the eccentric gear used in the invention, respectively; 1) ~
(4) is an explanatory diagram of the operation showing the relationship between the movable blade, the fixed blade, and the eccentric gear, FIGS. 9(a) and (b) are other embodiments of the invention, and No. be. 9...Eccentric gear, 9A, 9B...Eccentric cam, 10, 20--Fixed blade, 10 c,
21 b, ------- recess, 10d. 21, c... Convex portion, ll... Movable blade, O... Spring clock applicant Matsushita Electric Works Co., Ltd.

Claims (3)

[Claims] (1) Comprising a comb-shaped fixed blade and a comb-shaped movable blade that is provided in sliding contact with the N-leg rotation and reciprocates in the length direction,
In the mowing machine in which a side wall of a comb blade of the fixed blade is formed with an uneven part, the fixed blade is connected to a driving means so as to be movable in a direction intersecting the reciprocating direction of the movable blade. Characteristic mowing machine. (2) The fixed blade drive means has a first blade connected to a motor shaft that also reciprocates the movable blade. an eccentric gear having a 20th eccentric cam, and the second eccentric cam that engages with the fixed blade has an eccentricity equal to the eccentricity of the first eccentric cam that engages with the movable blade; The mowing machine according to item 1, wherein the eccentricity f is reduced. (3) The identification blade driving means has a longitudinal fixed blade base constituting the fixed blade, and a comb blade that is attached to the fixed blade base in a cross direction and protrudes to the outside. %1' which is composed of a comb blade part that is movable in the protruding direction, and (2) a spring that is set in the curve between the blade part and the fixed blade base and supports the comb blade part in a movable manner. F. A mowing machine according to claim 1.