JPH068202A - Cutting tool - Google Patents

Abstract

PURPOSE:To reduce the generation of buttings, prevent the breakage of a cutting blade and perform cutting true to a mark-off line. CONSTITUTION:A polygonal cam 2 is provided on a rotary shaft 1 which is driven for rotation by a prime mover such as a motor. Odd-numbered angles 2a, 2b, 2c... are provided on the polygonal cam 2. A cam follower 3 which receives the polygonal cam 2 is provided to a swinging arm 4. A cutting blade 5 is mounted on the swinging arm 4. The swinging arm 4 is reciprocated linearly by the rotation of the rotary shaft 1. The cutting blade 5 is linearly reciprocated to cut a material to be cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool used for cutting veneer boards, gypsum boards and the like, and more particularly to a cutting tool having a structure in which a blade is oscillated for cutting.

[0002]

2. Description of the Related Art Conventionally, a cutting tool of this type is disclosed in Japanese Utility Model Publication No. 1-26402. As shown in FIG. 4, an eccentric cam b is provided on a rotary shaft a driven by a motor, and a base end of a swing arm c is engaged with the eccentric cam b. The rocking arm c is provided with a vertically elongated long hole d, and a rocking fulcrum e is inserted through the long hole d, so that the rocking arm c can be rocked around the rocking fulcrum e. is there. A blade f is attached to the tip of the swing arm c. Then, when the rotating shaft a is driven, the eccentric cam b
The swing arm c swings and moves up and down with the swing support point e as a fulcrum, and the blade f also swings and moves up and down together with the swing arm c to cut the object to be cut by the blade f. The board h, which is, is cut. The oscillating arm c and the blade f are operated by the eccentric cam b in the order of FIGS. 4A, 4B, 4C, and 4D by the rotation of the rotating shaft a to oscillate back and forth and move up and down. . An annular arrow in FIG. 4B indicates the movement of the cutting edge of the cutting tool f, X indicates the vertical movement amount, Y indicates the swing amount, and Z indicates the protruding amount of the cutting edge.

[0003]

However, in the above-mentioned conventional example, the cutting powder is discharged in accordance with the movement of the blade f because the blade f moves up and down in the cutting direction in addition to swinging. This causes a problem that the working environment becomes worse. Further, since the blade f moves up and down, the blade f is damaged by hitting a metal base material i (a lightweight steel-frame ceiling base material in the case of a ceiling) that fixes the board h. This increases the exchange of the blade f. If the blade f swings back and forth at high speed and moves up and down, the cutting position cannot be confirmed. This causes a problem that it is difficult to follow the marking line.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to reduce the generation of cutting powder, to prevent breakage of the blade, and to cut along the marking line. To provide a cutting tool that can

[0005]

In order to achieve the above object, a cutting tool of the present invention is provided with a rotary shaft 1 which is driven to rotate by a prime mover such as a motor, and an odd number of corners 2 attached to the rotary shaft 1.
A polygonal cam 2 having a, 2b, 2c ..., a cam follower 3 that receives the polygonal cam 2 and linearly reciprocates by the rotation of the polygonal cam 2, and the cam follower 3 is integrally provided and linearly reciprocates. The rocking arm 4 and the blade 5 attached to the rocking arm 4 for cutting by a linear reciprocating motion are provided.

[0006]

According to the above construction, when the rotary shaft 1 is rotationally driven, the polygonal cam 2 is rotated and the cam follower 3 and the swing arm 4 are linearly reciprocated, and the blade 5 is linearly reciprocated. Cut the object to be cut. At this time, since the polygonal cam 2 reciprocates, the blade 5 can be reciprocated at a high speed at a high speed to cut. When cutting with the knife 5
Generates less cutting powder as it only moves linearly back and forth.
Further, since the cutting is performed only by the linear reciprocating motion, the blade 5 is not broken by hitting the base material or the like. Furthermore, since the blade 5 only reciprocates linearly and reciprocates a small amount, the cutting position of the blade 5 can be easily confirmed, and the blade 5 can be cut along the marking line.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a rotary shaft 1 is installed between a pair of upper and lower cases 10 and 11, and shaft supporting portions 12 and 13 at both ends of the rotary shaft 1 are freely rotatable in the cases 10 and 11. Is supported by. This rotary shaft 1 is a separate upper and lower upper shaft portion 1.
It is formed by a and the lower shaft portion 1b. A flange 14 is provided on the lower portion of the upper shaft portion 1a, and an angular shaft 15 is provided so as to project from the center of the lower portion of the upper shaft portion 1a. A male screw portion 16 is projected from the upper end of the lower shaft portion 1b, and a flange 17 is provided on the outer periphery of the upper portion of the lower shaft portion 1b. An odd number of corners 2a, 2b, 2c ... Are provided at equal intervals on the outer periphery of the polygonal cam 2, and a square hole 18 is formed in the center. Corners 2a, 2b, 2c
… Protrudes as arc-shaped mountains. The swing arm 4 is provided with a cam follower 3 having a rectangular frame shape, and the polygonal cam 2 is fitted into the cam follower 3 and received. The angular shaft 15 of the upper shaft portion 1a of the rotating shaft 1 is fitted into the rectangular hole 18 of the polygonal cam 2, and the male screw portion 16 of the lower shaft portion 1b is screwed into the angular shaft 15, whereby the rotating shaft 15
The upper shaft portion 1a and the lower shaft portion 1b are assembled, and the polygonal cam 2 is attached to the rotating shaft 1. In this state, the cam follower 3 is sandwiched between the upper and lower flanges 14 and 17,
Vertical movements of the cam follower 3 and the swing arm 4 are restricted. Shafts 4a and 4b of the swing arm 4 are cases 10 and 1.
It is slidably supported by one bearing portion 19a, 19b. A holder including a mounting bracket 20, a blade receiving bracket 21, and a blade pressing bracket 22 is attached to the tip of the swing arm 4. The upper part of the mounting bracket 20 is brought into contact with the side surface of the tip end of the swing arm 4, and the mounting screw 20 is screwed into the mounting hole 24 of the swing arm 4 from the mounting hole 23 of the mounting bracket 20 to mount the mounting bracket 20. It is installed. A blade receiving metal fitting 21 is brought into contact with the mounting metal fitting 20, and a mounting screw 28 is screwed from a mounting hole 26 of the blade metal fitting 21 into a mounting hole 27 of the mounting metal fitting 21. The blade receiving metal fitting 21 can be rotated around the mounting screw 28 in a state where the blade receiving metal fitting 21 is attached by the mounting screw 28, and the angle of the blade 5 attached to the blade receiving metal fitting 21 can be changed. ing. In order to stop the rotation of the blade receiving metal fitting 21, the fixing screw 3 is inserted from the fixing hole 30 of the blade receiving metal fitting 21 to the fixing hole 31 of the mounting metal fitting 21.
2 is screwed together. At this time, a plurality of fixing holes 31 are provided, and the blade receiving metal fitting 21 is rotated together with the blade 5 to adjust the angle of the blade 5, and then the fixing screw 3 is attached to the appropriate fixing hole 31.
2 can be screwed and fixed. A tool holding metal fitting 22 is in contact with the tool receiving metal fitting 21 via the upper portion of the tool 5, and a mounting screw 3 is attached from a mounting hole 33 of the tool holding metal fitting 22 to a mounting hole 34 of the tool receiving metal fitting 21.
5 is screwed to attach the blade holding metal fitting 22, and the blade 5 is clamped. FIG. 3 is a schematic view showing the whole cutting tool, 37 is a battery pack, 38 is a grip, 39
Is a base, and 40 is a prime mover housing such as a motor.

By rotating the rotary shaft 1,
When the polygonal cam 2 rotates, the corners 2a, 2b of the polygonal cam 2,
At 2c ..., the swing arm 4 linearly reciprocates together with the cam follower 3, and the blade 5 linearly reciprocates to cut the object to be cut. The operation of the cam follower 3 and the swing arm 4 by the polygonal cam 2 is as shown in FIG. That is, when the polygonal cam 2 rotates, the corners 2a, 2b, 2c, ... Contact the inner surface of the cam follower 3 in the order shown in FIGS.
Makes a linear reciprocating motion. At this time, a small amount of reciprocating motion is performed with the stroke amount shown by the symbol S, and the blade 5 is reciprocatingly moved at a minute amount of high speed to be cut. By this operation, the blade 5 reciprocates by the number of angles 2a, 2b, 2c ... With respect to one rotation of the polygonal cam 2. At this time, the corners 2a, 2b, 2 of the polygonal cam 2 are
Although c ... Are provided at equal intervals, the number of the corners 2a, 2b, 2c ... that contact the inner surface of the cam follower 3 must always be one, and the number of the corners 2a, 2b, 2c ... Is an odd number. In addition, depending on the hardness of the material to be cut, the blade 5
The angle can be changed as described above, and cutting can be performed according to the hardness of the material.

[0009]

Since the present invention is constructed as described above, when the rotary shaft is rotationally driven, the polygonal cam rotates and the cam follower and the swinging arm make a linear reciprocating motion, and the blade makes a linear reciprocating motion. The cutting tool can cut the object to be cut, and since it reciprocates with the polygonal cam, it can reciprocate by a minute amount and cut. As a result, less cutting powder is generated and the working environment can be improved.Because cutting is done only by linear reciprocating motion, the cutting tool does not break due to hitting the base material etc. Further, since the blade only reciprocates linearly and reciprocates a small amount, it is easy to confirm the cutting position of the blade and it is possible to cut along the marking line.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts of an embodiment of a cutting tool of the present invention.

2 (a), (b) and (c) are explanatory views for explaining the operation of the main part of the same.

FIG. 3 is a schematic perspective view of the entire same as above.

FIG. 4 is an explanatory diagram illustrating an operation of a conventional example.

[Explanation of symbols]

 1 rotary shaft 2 polygonal cam 3 cam follower 4 swing arm 5 blade

Claims (1)

[Claims] 1. A rotary shaft rotatably driven by a prime mover such as a motor, a polygonal cam mounted on the rotary shaft and having an odd number of angles, and a linear cam that receives the polygonal cam and linearly reciprocates by rotation of the polygonal cam. A cutting tool comprising: a moving cam follower; a swing arm that is integrally provided with the cam follower and that linearly reciprocates; and a blade that is attached to the swing arm and cuts by the linear reciprocating motion.