JPS6215240B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an inner blade of a vibrating electric shaver, and particularly to a method of polishing the blade edge thereof.

In the conventional method of polishing the cutting edge of this type of inner cutter, the inner cutter assembled into a semi-cylindrical shape is held in a polishing fixture, and is rotated or rotated in the same direction on a rotating grindstone. He applied it to the blade and polished the edge of the blade. Therefore, when rocking, the polishing conditions are different depending on whether the grinding wheel is rotated in the direction opposite to the rotation of the grindstone or in the same direction as the rotation direction of the grindstone, and the cutting edge of the inner cutter body is Because it comes into contact with the whetstone intermittently, the polished surface of the cutting edge, especially the part that first comes into contact with the whetstone, that is, the polished surfaces of both ends,
There was a drawback that it caused roughness. Furthermore, even when polishing is performed while rotating in the same direction, the cutting edge of the inner cutter still comes into contact with the grindstone intermittently, so that the polished surface becomes rough, as described above.

The present invention provides a method for manufacturing an inner blade of a vibrating electric shaver, which eliminates the drawbacks of the prior art and can uniformly polish the polished surface without causing roughness and shorten the polishing time. With the goal.

In order to achieve this object, the present invention provides inner blade pieces arranged parallel to each other at equal intervals, ring-shaped abutment plates arranged on both sides of these inner blade pieces, and fixed and supported integrally. Two semi-cylindrical inner cutting bodies are formed into a cylindrical shape from a plurality of supporting rods, and slits extending in the radial direction are provided in advance at positions corresponding to the cutting points on the inner circumferential part of the abutting plate. After polishing the cutting edge of the inner cutter piece of this cylindrical polished body, the cylindrical polished body is cut along the slit of the contact plate to form two semi-cylindrical pieces. It is characterized by being divided into inner blade bodies.

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are diagrams for explaining the first embodiment.

Reference numeral 1 denotes a substantially semi-cylindrical inner cutter body, which includes arc-shaped inner cutter pieces 2 arranged at equal intervals and parallel to each other, and halves of ring-shaped backing plates 3 arranged at both ends thereof. It is constituted by a plurality of support rods 4 that fixedly support these together. The upper inner cutter body 1 and the lower inner cutter body 1 are connected by a ring-shaped contact plate 3, and the two inner cutter bodies 1 are combined into a cylindrical shape. The support rod 4 is arranged to connect the vicinity of both ends and the center of each arcuate inner cutter piece 2 to each other.

As shown in FIG. 1, both ends of the inner cutter piece 2 in the upper inner cutter body 1 and the inner cutter piece 2 in the lower inner cutter body 1
The two end portions face each other with a slight gap between them. On the other hand, as shown in FIG.
Each is provided with a radially extending slit 5 to facilitate the cutting described below. When performing centerless polishing as described later, the outer peripheral corners of each inner cutter piece 2 facing the gap between the inner cutter pieces 2, 2, that is, the corners at both ends of the cutting edge, directly hit the polisher and become difficult to polish. A protrusion 6 is formed on the outer periphery of the shaped abutment plate 3 corresponding to the gap. The distal end surface of the protruding portion 6 is formed so as to be on the same circumferential surface as the outer circumferential surface of the inner cutter piece 2, so that the outer circumferential corner of the inner cutter piece 2 does not come into contact with the polishing machine.

By centerless polishing the cylindrical object to be polished, which includes these two semi-cylindrical inner blades, the cutting edges of the two inner blades 1 can be polished simultaneously and uniformly without causing any roughness on the polished surface. Polished. After polishing, the ring-shaped contact plate 3 is cut from the inside to the outside along the line A-A' along the slit 5 of the ring-shaped contact plate 3, resulting in two semi-cylindrical pieces with polished cutting edges. An inner blade body 1 is obtained.

FIG. 3 and FIG. 4 are diagrams for explaining a second embodiment of the present invention. In the case of this embodiment, by forming the contact plate 3 and each inner cutter piece 2' into a ring shape common to both inner cutter bodies 1, two inner cutter bodies 1 are formed.
It is possible to directly assemble a cylindrical object to be polished including: In the case of this embodiment as well, slits 5 extending radially from the inner circumference toward the outer circumference are formed in advance at positions corresponding to the cutting points on the inner circumference of the ring-shaped contact plate 3.

By centerless polishing this cylindrical object to be polished, the cutting edge portions of the two inner blade bodies 1 are simultaneously and uniformly polished without causing roughness on the polished surfaces. After polishing, the ring-shaped contact plate 3 and each inner cutter piece 1 are cut along the line B-B' along the slit 5 to obtain two semi-cylindrical inner cutters 1 with polished cutting edges. .

As explained above, according to the manufacturing method of the present invention, two semi-cylindrical inner blade bodies are formed into a cylindrical shape,
After the cutting edge is polished, it is divided into two semi-cylindrical inner cutting bodies, so that the cutting edge of each inner cutting edge is uniformly ground while in continuous contact with the rotating grindstone, and its polished surface is There will be no roughness at all. Furthermore, since two semi-cylindrical inner cutters can be polished at the same time, the polishing time can be reduced to about half of the conventional one. In addition, since the object to be polished is cylindrical, centerless polishing can be used as a polishing method that can obtain a highly accurate perfect circle, and as a result, the accuracy of polishing the cutting edge of the inner blade body is improved. becomes possible.

In addition, when cutting the ring-shaped backing plates placed on both sides of the inner blade group, slits are formed in advance in the backing plates so that cutting can be started from a predetermined position and cut in half. However, when this slit is provided on the outer periphery of the backing plate, the following problems occur. In other words, if a slit is formed on the outer periphery of the backing plate, a part of the polishing machine will get caught in the slit of the backing plate when polishing the cutting edge of the inner cutter piece, making it impossible to polish uniformly. Workability also deteriorates.
On the other hand, if a slit is provided in the inner circumferential portion of the contact plate as in the present invention, the above-mentioned problem will not occur and uniform polishing will be performed smoothly.

[Brief explanation of the drawing]

Figures 1 and 2, Figures 3 and 4 are
FIG. 3 is a front view and a side view of an object to be polished consisting of two inner cutters, each formed according to a different embodiment of the present invention. 1... Inner blade body, 2... Arc-shaped inner blade piece, 2'...
Ring-shaped inner blade piece, 3...Abutment plate, 5...Slit.

Claims (1)

[Claims] 1. Two inner blade pieces arranged parallel to each other at equal intervals, a ring-shaped contact plate placed on both sides of the inner blade pieces, and a plurality of support rods that fix and support these pieces together. A semi-cylindrical inner cutter body is formed into a cylindrical shape, and a slit extending in the radial direction is provided in advance at a position corresponding to the cutting location on the inner circumferential portion of the contact plate to constitute a cylindrical body to be polished. After grinding the cutting edge of the inner cutter piece of the shaped body to be polished, the cylindrical body to be polished is cut along the slit of the contact plate and divided into two semi-cylindrical inner blade bodies. A method for manufacturing the inner blade of a vibrating electric shaver.