JPS5922541B2 - How to make the inner blade of a vibrating electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing the inner blade of a vibrating electric shaver, and is particularly different from conventional blades in that the blade edge angle is not 90 degrees but has blade edges of about 60 degrees on both sides. Our goal is to provide the following.

Moreover, the manufacturing method is very simple and provides a method that allows mass production at low cost.

Hereinafter, one embodiment of the present invention will be described based on the drawings.
The conventional inner cutter 1 shown in FIG. 1 has a rectangular shape and a cutting edge angle of 90 degrees.

Therefore, the cutting edge could not be said to be extremely sharp.

The present invention has sharp cutting edges 2, 2 as shown in Fig. 2.
The present invention provides inner cutters 3, 3... having .

That is, first, a cutter material 4 having a plate thickness of about 0.1 mrn is prepared, and the material 4 is suitably made of stainless steel, alloy steel, SK steel, or the like for cutlers.

5, 5... are fixing and positioning holes required for processing.

Then, a photoresist film is applied to both sides of the material 40.

6 is a photosensitive film, which has a plurality of semicircular arc-shaped parts 7, 7.
. . . is an opaque portion, and the other portions are transparent portions 8.

Also, holes 5 on the material 4 side are provided at both ends of the film 60.
Holes 9, 9, . . . are provided at the same pitch P as .

Then, after placing the film 6 on the photoresist film, when it is exposed to light, the semicircular arc-shaped opaque parts 7, 7, etc. do not transmit light, so the photoresist film corresponding to these parts is not exposed to light. , the other transparent parts 8 are exposed to light, and the photoresist film parts in those parts are exposed to light.

Therefore, after exposure, when this film 6 is removed and washed with water, the material surfaces 10, 10... as shown in FIG.
・is exposed in a semicircular arc shape.

Note that the other surfaces are covered with a hardened photoresist film portion (resistance film) 14.

Next, an etching liquid made of ferric chloride is sprayed onto both sides of the material 40 to etch it onto the exposed surfaces 10, 10, . . . .

The degree of this etching is such that the etching depth is approximately % to % of the thickness of the material.

The situation is shown in Figure 8. Due to the nature of the etching, the angle of inclination of the corroded area is about 60 degrees.

Next, this semicircular arc-shaped etched portion 11°11...
Approximately semicircular shape 12°12... as shown in Figure 6 including
...and punch out this material 4.

Next, the punched inner blade pieces 12, 12...
is insert-molded into the inner cutter base 13 by die-casting as in the conventional method.

This state is shown in Fig. 7, and in the N state, the tip of each piece 12, 12, etc. remains with a 90 degree edge angle similar to the conventional one. So this part 13
, 13..., the tip surfaces of the inner blade pieces 12, 12... are processed by cylindrical grinding to uniformly remove the tips of the etched portions IL11... Grind until.

Therefore, as shown in FIG. 2, each inner blade piece 12,1
An inner blade piece is formed having sharp cutting edge edges 2, 2, .

With this type of inner blade, the inner blade has a sharp cutting edge, so the outer blade (not shown) can sharply cut the hair that has gotten into it.
The sharpness is further improved.

As described above, according to the present invention, first, a large number of semicircular arc-shaped exposed surfaces and the other resistive film portions are formed on both surfaces of the inner blade material by photolithography or the like. Next, the exposed surface is etched to an appropriate depth from both sides of the material, and then a number of inner blade pieces are punched out from the material in a semicircular shape including the semicircular etched portion, and this piece is After insert-molding the inner blade into the inner blade base, the tip surface of each inner blade piece is finally ground to create a sharp cutting edge (blade angle of about 60 degrees).
It is possible to manufacture the inner blade of a vibrating electric shaver that is formed at the tip of both sides.

In addition, a large number of inner blade pieces having sharp cutting edges on both sides can be formed by pressing from an etched material at the same time, making mass production possible and reducing manufacturing costs.

The series of steps is as follows: formation of a resistive film on the inner blade material surface by photosensitization, etc. → etching on both sides of the material → pressing of the inner blade element → molding of the inner blade element into the inner blade base → inner blade element It is a simple process that can be performed continuously with grinding of one end surface.
As a method for forming inner blades having sharp edges at the tips of each inner blade, it is possible to provide a unique manufacturing technique that can be made in large quantities in a short period of time, which has not been seen before.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 shows a conventional inner cutter body, FIG. 2 shows an inner cutter body of the present invention, and FIGS. 3 to 7 show the manufacturing process of the inner cutter of the present invention. , Figure 3 shows the inner blade material,
Figure 4 shows the film applied to the surface of the inner blade material coated with photosensitive liquid, Figure 5 shows the resistive film formed on the material surface after exposure and the exposed state of the material surface, and Figure 6 shows the exposed state of the material surface. The shape of the inner cutter piece punched out from the material is shown, and FIG. 7 shows the state in which the inner cutter piece is insert molded into the inner cutter base. FIG. 8 is a diagram showing the etched state of the inner blade material based on double-sided etching, and FIG. 9 is a front view and a side view of each punched inner blade piece. , "4... Inner blade material, 14... Coating portion, 10, 10... Semicircular arc exposed surface, 12, 12
...Inner blade piece, 13...Inner blade stand, 2,
2... Edge of the blade.

Claims (1)

[Claims] 1. In a method for manufacturing an inner blade of a vibrating electric shaver, coating portions are formed on both sides of the inner blade material so that the material surfaces are exposed in multiple semi-circular arc shapes, and both sides of the inner blade material are exposed. Then, the semicircular arc-shaped exposed surface is etched to an appropriate depth by an etching method, and a large number of approximately semicircular inner blade pieces including the semicircular etched portions are cut from the metal plate, and the inner blade pieces are A method for manufacturing an inner blade of a vibrating electric shaver, in which the inner blade is molded into an inner blade base, the upper peripheral surface of the inner blade element is ground, and acute-angled blade edges are formed at the ends of both sides of the inner blade element. .