JPS5844080A - Vibration type electric razor and production of inner blade body - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing an inner blade of a vibrating electric shaver,
In particular, it relates to a method of polishing the cutting edge.

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 whetstone or in the same direction as the whetstone's rotation direction, and the cutting edge of the Maruuchi blade body is in contact with the whetstone. Because of the intermittent contact, there is a drawback that 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, becomes rough. 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 inner cutter bodies each made up of a plurality of supports for cutting are formed into a cylindrical shape, and slits extending in the radial direction are provided in advance at positions corresponding to the cutting points on the inner circumference of the front distribution plate. After grinding the cutting edge of the inner cutter piece of the object to be polished, cut the cylindrical cover 1 along the slit of the contact plate and divide it into two semi-cylindrical inner cutter bodies. This is a characteristic feature.

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 an almost semi-cylindrical inner cutter body, which includes arcuate 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 of the inner cutter pieces 1. , and 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 so as to connect the vicinity of both ends and the center of each arcuate inner cutter piece 20 with each other.

As shown in FIG. 1, both ends of the inner cutter piece 2 in the upper shaft inner cutter body 1 and the lower side] Both ends of the inner cutter piece 20 in the inner cutter body 1 are opposed to each other with a slight distance between them. There is. On the other hand, as shown in FIG. 2, a slit 5 extending in the radial direction is provided at the inner circumference of the ring-shaped contact plate 3 at a position facing the gap between the inner cutter pieces 2 to facilitate cutting, which will be described later. Each is provided. When performing centerless polishing as described below, the inner blade piece 2
．． The outer periphery corner of each inner cutter piece 2 facing the gap between the inner cutter pieces 2, that is, the corners of both ends of the cutting edge hit the surface polisher and are polished. A protrusion 6 is formed.The tip surface of this protrusion 6 is attached to the inner cutter piece
The outer circumferential corner of the inner cutter piece 2 is formed so as to be on the same circumferential surface as the outer circumferential direction of ω [to prevent it from hitting the heavy machinery.

By centerless polishing the cylindrical object to be polished, which includes the two inner cutter bodies, the cutting edges of the two inner cutter bodies 1 can be polished uniformly without causing any roughness on the polished surface. 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, thereby forming two semi-cylindrical pieces with polished cutting edges. The inner cutter 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 the cylindrical cutter body 1, a cylindrical object to be polished including two inner cutter bodies 1 is formed. Similarly, in the case of this embodiment, which could be directly assembled,
A slit 5 extending radially from the inner circumference toward the outer circumference is formed in advance at a position corresponding to the cutting location on the inner circumference of the ring-shaped contact plate 3.

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

As explained above, according to the manufacturing method of the present invention, after forming two inner blade bodies into a cylindrical shape and polishing the cutting edge portion,
Since each inner cutter is divided into two semi-cylindrical inner cutters, the cutting edge of each inner cutter is ground uniformly in continuous contact with the rotating whetstone, and there is no roughness on the polished surface. .

Since it is possible to simultaneously polish two twisted inner blade bodies, the polishing time can be reduced to approximately half of the conventional method.

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 polishing accuracy of the cutting edge of the inner blade body can be improved as described above. becomes possible.

In addition, when cutting the ring-shaped backing plate that is resistant on both sides of the inner blade group, slits are formed in the backing plate in advance so that the cutting can be started from the desired position and cut in half. However, if this slit is provided on the outer periphery of the plate, t
Well, the following problem arises. In other words, if a slit is formed on the outer periphery of the contact plate, part of the polisher will get caught in the slit of the contact plate when polishing the cutting edge of the inner cutter piece, making it impossible to polish uniformly and making the work more difficult. Sex also gets worse.

On the other hand, if slits are 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]

1 and 2, FIG. 3, and FIG. 4 are a front view and a side view, respectively, of an object to be polished consisting of two inner blade bodies formed according to different embodiments of the present invention. . 1... Inner blade body, 2... Arc-shaped inner blade piece,
2'...Ring-shaped inner blade piece, 3...Touching plate, 5...Slit o (Fig. 2, 3, 74)

Claims (1)

[Claims] Consists of inner blade pieces arranged parallel to each other at equal intervals, ring-shaped contact plates placed on both sides of the inner blade pieces, and multiple supports that fixedly support these pieces together. The two inner blade bodies are formed into a cylindrical shape, and a slit extending in the radial direction is provided in advance at a position corresponding to the cutting point on the inner peripheral part of the front distribution plate, and the cutting edge of the inner blade piece of this cylindrical body to be polished is The inner blade body of a vibrating electric shaver is characterized in that the cylindrical body to be polished is cut along the slits in the front distribution plate and divided into two semi-cylindrical blade bodies. Manufacturing method.