JPH0133321B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a fixed cutter and a movable cutter whose movement is adjusted in the axial direction of the fixed cutter, and the total width of the cutting blades of both cutters can be arbitrarily adjusted. This relates to a groove cutting cutter.

SUMMARY OF THE INVENTION An object of the present invention is to provide a grooving cutter for woodworking in which the position of the movable cutter can be adjusted and fixed after positioning very easily.

An embodiment embodying the present invention will be described below with reference to the drawings. Note that FIG. 1 shows the fixed cutter 14.
The movable cutter 20 is shown in a cross section taken along line XX in FIG. 2, and the movable cutter 20 is shown in a cross section taken along line YY in FIG. Reference numeral 1 denotes a shaft cylinder into which the rotating shaft 2 of the electric motor can be inserted, and 3 and 4 are a pair of left and right mounting plates mounted on the coaxial cylinder 1 with a slight distance G between them. A recess 5 is formed. Reference numeral 6 denotes a pair of snap springs attached to the outer periphery of the shaft cylinder 1 so as to engage with the bottom wall of each recess 5, and restrict outward movement of each mounting plate 3, 4.

Note that the distance between the outer surfaces of the mounting plates 3 and 4 is greater than the length of the shaft tube 1.

Reference numeral 7 denotes a cylindrical portion formed on the outer periphery of the right mounting plate 4, and protrudes toward the right side (outward side). Reference numeral 8 denotes a tapered surface formed from the outer periphery of the cylindrical portion 7 to the outer periphery of the right mounting plate 4, and has an oblique shape with the diameter increasing toward the right side. 9 is a tapered surface formed on the outer periphery of the left mounting plate 3;
It has an oblique shape with the diameter increasing as the diameter increases.

10 is a wide expansion ring attached to cover the tapered surfaces 8, 9 of the mounting plates 3, 4,
A pair of left and right tapered surfaces 11 and 12 are formed on the inner periphery to engage with the respective tapered surfaces 8 and 9, respectively. As shown in FIG. 4, reference numeral 13 denotes an incision formed in a part of the expansion ring 10 to allow the expansion ring 10 to expand outward. A fixed cutter 14 is attached to the outer periphery of the left end of the expansion ring 10 in correspondence with the left mounting plate 3, and is screwed into the annular portion 14a of the cutter 14 from the outside as shown in FIGS. two bolts 1
5, it is fixed to the expansion ring 10 so that it cannot rotate or move in the axial direction. Reference numeral 16 denotes a pair of cutting blades of the fixed cutter 14, each consisting of a bottom cutting blade 17 and a side cutting blade 18.

19 is the expansion ring 10 as shown in FIG.
These are four guide grooves formed approximately on the right half of the outer periphery, and extend spirally at equal intervals.

20 is a movable cutter attached to the expansion ring 10 at positions corresponding to these guide grooves 19, and as shown in FIGS. 1 and 3, four bolts are screwed into the annular portion 20a from the outside. 21 is inserted into each guide groove 19. and,
The tip of each bolt 21 is slightly spaced apart from the bottom of each guide groove 19, and is movable along each guide groove 19.

Therefore, when the movable cutter 20 is rotated on the expansion ring 10, the cutter 20 is simultaneously moved relative to the expansion ring 10 in the axial direction thereof.

The rotation range of the movable cutter 20 is as shown by the two-dot chain line in FIG.
is set within a range that does not overlap with the pair of cutting blades 16 of the fixed cutter 14 (actually, within 80 degrees).

22 is a pair of cutting blades of the movable cutter 20, which, like the cutting blades 16 of the fixed cutter 14,
Each of them consists of a bottom cutting blade 23 and a side cutting blade 24. This cutting blade 22 is the fixed cutter 14
is located on the same circumference as the cutting blade 16 of
6 to cut a groove having a total width W.

When using the grooving cutter configured as described above, insert the rotary shaft 2 of the electric motor into the shaft tube 1 of the cutter as shown in FIG. The nut 26 is screwed onto the rotating shaft 2 from the right side while the nut 26 is in contact with the fixed plate 25 of the rotating shaft 2. Then, the nut 26 strongly presses both the mounting plates 3 and 4 toward the fixed plate 25 via the washer 27. Therefore, at this time, the distance G between both mounting plates 3 and 4 is slightly narrowed.

When both the mounting plates 3 and 4 are pushed to the left, the tapered surfaces 8 and 9 on the outer circumference of these are pressed against the corresponding tapered surfaces 11 and 12 on the inner circumference of the expansion ring 10, and the expansion ring 10 is moved in the width direction. Extends outward throughout. Therefore, the outer circumferential surface of the ring 10 is fixed, and the annular portion 14a of the cutters 14, 20 is movable.
The movable cutter 20 is strongly pressed against the inner circumference of the cutter 20a.
cannot move or rotate in the axial direction on the expansion ring 10.

Therefore, if the groove cutter is rotated together with the rotary shaft 2 in this state, a groove having a width W can be formed. When forming such a groove by cutting, a thrust is applied to the movable cutter 20 to press it toward the fixed cutter 14, but this thrust is not only caused by the pressing force of the expansion ring 10 against the movable cutter 20, but also by the movable cutter 20. Bolt 21 on 20
It is also supported by the engagement of the guide groove 19 on the expansion ring 10.

When changing the total width W of both cutting blades 16, 22, loosen the nut 26 and remove both mounting plates 3, 4.
The pressing force on the expansion ring 10 and the expansion force caused by these are released, and in this state, the movable cutter 20 is rotated to the left or right on the expansion ring 10.
Then, each bolt 21 on this movable cutter 20
The tip of the movable cutter 20 slides along each guide groove 19 on the expansion ring 10, and at this time, the movable cutter 20 is also moved in the axial direction. Therefore, the total width W of the cutting blades 16 and 22 of both the fixed and movable cutters 14 and 20 is changed. In addition, at the time of such a change, both cutting blades 16 and 22 are moved closer to each other or separated from each other.

In this way, the total width W of both cutting blades 16, 22
After changing, the nut 26 is tightened again in the same manner as described above to firmly fix the movable blade 20 on the expansion ring 10.

Note that the tapered surface 9 on the outer periphery of the left mounting plate 3 corresponding to the fixed cutter 14 in the embodiment described above does not necessarily need to be formed, and the configuration is simply such that the mounting plate 3 does not enter inside the expansion ring 10. But that's fine.

As described in detail above, the present invention provides a rotation shaft 2 of an electric motor.
A pair of mounting plates 3 and 4 are attached to the outer periphery of the shaft cylinder 1, which can be mounted on the shaft, and one of the mounting plates 4 is movable in the axial direction, and the mounting plate 4 is made movable in the axial direction.
A tapered surface 8 is formed on the outer circumferential surface of the mounting plates 3 and 4, and an expansion ring 10 is mounted on the outer circumferential surfaces of both the mounting plates 3 and 4 so as to cover them. The tapered surface 8 of the mounting plate 4
A fixed cutter 14 is attached to one end of the outer periphery of the expansion ring 10 so as not to be movable in the axial direction, and a spiral shaped cutter 14 formed on the outer periphery of the expansion ring 10 is attached to the other end. By installing the movable cutter 20 which can be moved in the axial direction along the guide groove 19 of the movable cutter, it is possible to adjust the movement of the movable cutter and fix it after adjustment very easily. This is an excellent invention for industrial use as a groove cutter.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a woodworking groove cutter embodying the present invention installed on the rotating shaft of an electric motor, Figure 2 is a side view of the fixed cutter, and Figure 3 is the rotation range of the movable cutter. FIG. 4 is a side view showing the expansion ring, and FIG. 4 is a perspective view of the expansion ring. Shaft tube...1, Rotating shaft...2, Mounting plate...3,
4, Tapered surface...8, Expansion ring...10, Tapered surface...12, Fixed cutter...14, Guide groove...19, Movable cutter...20.

Claims (1)

[Claims] 1. A pair of mounting plates 3 and 4 are attached to the outer periphery of a shaft cylinder 1 that can be mounted on a rotating shaft 2 of an electric motor, and one of the mounting plates 4 is movable in the axial direction. At the same time, a tapered surface 8 is formed on the outer circumferential surface of the mounting plate 4 so that the diameter increases toward the outer side, and an expansion ring 10 is formed on the outer circumferential surface of both the mounting plates 3 and 4 to cover them. A tapered surface 12 is formed on the inner circumference thereof to engage with the tapered surface 8 of the mounting plate 4, and a fixed cutter 14 is attached to one end of the outer circumference of the expansion ring 10 so as to be immovable in the axial direction. A grooving cutter for woodworking, characterized in that a movable cutter 20 is attached to the other end of the expansion ring 10 so as to be movable in the axial direction along a spiral guide groove 19 formed on the outer periphery of the expansion ring 10. 2 A plurality of bolts 21 are screwed into the annular portion 20a of the movable cutter 20 from the outside, and each bolt 21
A groove cutting cutter for woodworking according to claim 1, wherein the tip of the cutter is movably inserted into a plurality of guide grooves.