JPH0210234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cylindrical mesh inner cutter for a rotary electric shaver by electroforming.

A conceivable method for manufacturing a cylindrical mesh inner cutter is to form a flat mesh base plate by electroforming or press working, and then bend it into a cylindrical shape. Because the mesh blank is thin, it is difficult to bend it into a nearly perfect circle, and there is a seam where the edge of the mesh blank is butted against a part of the circumference, and the mesh outer cutter gets caught by the edge of this seam. Easy to break. In addition, the cylindrical mesh inner cutter obtained by this method has residual stress latent within the thickness section of the plate during this bending process, so it is likely to break when subjected to external force. There are various practical problems in obtaining an inner cutter by bending a flat mesh blank plate into a cylindrical shape.

Focusing on this fact, this invention attempts to easily obtain a durable cylindrical mesh inner cutter that is seamless and hard to break by integrally molding the mesh inner cutter into a cylindrical shape using an electroforming method. It is.

The details will be explained below based on the drawings.

FIG. 1 shows a part of a rotary electric shaver, in which a semicircular mesh outer cutter 2 is detachably attached to the upper part of a main body case 1 with an outer cutter holder 3. , cage-shaped rotating body 19
A cylindrical mesh inner cutter 5 fitted on the outer periphery of the mesh outer cutter 2 is rotatably slidable against the inner surface of the mesh outer cutter 2.
The cylindrical mesh inner cutter 5 has a gear 6 fixed to one end of the shaft 4 of the cage-shaped rotating body 19, and connects a drive gear 9 on the shaft 8 of a motor 7 built in the main body case 1 to the gear 6 as a reduction gear. By transmitting power through the 10 groups, it is driven to rotate around the shaft 4.

The cylindrical mesh inner cutter 5 is manufactured as follows.

First, as shown in Figure 4, transparent glass,
Cylindrical electroforming mother mold 11 (thickness, 0.05 to 1 mm) made of acrylic styrene or acrylic
A conductive film 12 is formed on the inner surface of the conductive film 12, and an electrically insulating film 14 having a pattern corresponding to the through-holes 13 of the mesh inner blade 5 is formed on the inner surface of the conductive film 12. Figures 3 and 4
In the figure, in order to form this electrically insulating film 14, a photoresist 20 is applied or pasted on the conductive film 12 on the inner surface of the electroforming mother mold 11, and the through holes of the mesh inner cutter 5 are formed on the outer surface of the electroforming mother mold 11. A mask 21 having a pattern corresponding to 13 is attached, and the photoresist 2
The electrically insulating film 14 is formed by exposing the outer periphery of the mask 21 to light rich in ultraviolet rays and developing it.
When forming the electrically insulating film 14 in this way, the electroforming matrix 11 is configured to be transparent, and the conductive film 1 of the matrix 11 is
By coating or pasting a photoresist 20 on the inner surface of the matrix 11, pasting a mask 21 on the outer surface of the matrix 11, and exposing it to light irradiated from outside the matrix 11, the matrix 1
The light transmitted through 1 and the conductive film 12 hardens the photoresist 20 while drying the solvent in the photoresist 20 from the side that is in contact with the conductive film 12 on the surface to be adhered, so that the electrically insulating film 14 is strongly integrated with the conductive film 12. The adhesive can be cured.

Next, the electroforming mother mold 11 on which the electrically insulating film 14 has been formed is transferred to an electrodeposition bath, and primary electrodeposition of metal such as copper is performed to form the electrically insulating film 14 of the mother mold 11 as shown in FIG. After forming a primary electrodeposited layer 15 with a substantially arcuate cross section that protrudes beyond the thickness of the electrically insulating film 14 on the inner surface that is not covered by the conductive film 12, the primary electrodeposited layer 15 is coated with sodium dichromate or A peeling treatment is performed on the inner surface of the primary electrodeposited layer 15 by immersing it in an aqueous solution such as potassium dichromate. Furthermore, by performing secondary electrodeposition of nickel or an alloy of nickel and cobalt, etc., continuous ribs 16 between the through holes 13 of the mesh inner blade 5 are formed on the peeled surface of the primary electrodeposition layer 15 as shown in FIG. A secondary electrodeposited layer 17 is formed.

After that, this was pulled up from the electrodeposition bath and the mother mold 11
By destroying the secondary electrodeposition layer 17 and peeling it off from the peeling-treated surface of the primary electrodeposition layer 15, a through hole 13 and a countersink 18 are formed on the surface as shown in the enlarged view in FIG. A cylindrical mesh inner cutter 5 having continuous ribs 16 formed therein can be obtained. Incidentally, this cylindrical mesh inner cutter 5 is fitted and assembled onto the outer periphery of the cage-shaped rotating body 19, as shown in FIG.

As explained above, according to the manufacturing method of the present invention, a cylindrical electroforming mother mold 11 is prepared, an electrical insulating film 14 is formed on the conductive inner surface, and then primary electrodeposition and secondary electrodeposition are performed. Since the mesh inner cutter 5 is integrally molded into a cylindrical shape by applying a bonding process, the cylindrical mesh inner cutter 5 can be easily obtained without seams and close to a perfect circle. It is possible to always slide and rotate smoothly. In addition, there is no problem of residual stress caused by bending a flat mesh blank plate into a cylindrical shape, and it does not crack even when subjected to external force, making it highly durable. Moreover, the secondary electrodeposited layer 1
Since the electroformed mother mold 11 is destroyed when the electrode 7 is peeled off, it has the advantage that it can be easily peeled off without destroying the secondary electrodeposited layer 17.

[Brief explanation of drawings]

Fig. 1 is a partial longitudinal sectional view illustrating a rotary electric shaver, Fig. 2 is a perspective view of a cylindrical mesh inner cutter, Fig. 3 is a perspective view showing a cylindrical electroforming mother mold and a mask, Figure 4 is a cross-sectional view of the electroforming mother mold with photoresist coated or pasted on the inner surface of the electroforming mother mold, and Figure 4 is a cross-sectional view of the electroforming mother mold after an electrical insulating film has been formed on the inner surface of the electroforming mother mold. FIG. 5 is a partial sectional view of the electroforming mother mold after primary electrodeposition, and FIG. 5 is a partial sectional view of the electroforming mother mold after secondary electrodeposition. 5...Mesh inner cutter, 11...Electroformed mother mold, 12...Conductive film, 13...Through hole part of mesh inner cutter, 14...Electric insulation film, 15...Primary electrodeposited layer, 16...Continuous rib of mesh inner cutter, 17... Secondary electrodeposition layer, 20... Photoresist, 2
1...Mask.

Claims (1)

[Claims] 1. A step of forming an electrically insulating film 14 with a pattern corresponding to the through-holes 13 of the mesh inner cutter 5 on the conductive inner surface of the transparent cylindrical electroforming matrix 11; On the inner surface of the casting mold 11 that is not covered with the electrical insulating film 14,
A step of forming a primary electrodeposited layer 15 that protrudes beyond the thickness of the electrical insulating film 14 by primary electrodeposition, and a step of performing a peeling treatment on the inner surface of the primary electrodeposition layer 15 and then performing secondary electrodeposition. A step of forming a secondary electrodeposition layer 17 which becomes a continuous rib 16 between the through holes 13 of the mesh inner cutter 5, and a step of breaking the matrix 11 and peeling off the secondary electrodeposition layer 17. A method for manufacturing a cylindrical mesh inner blade for an electric razor, characterized in that: 2. The electrical insulating film 14 is made by coating or pasting a photoresist 20 on the conductive inner surface of the transparent cylindrical electroforming mother mold 11, pasting a mask 20 on the outer surface of the electroforming mother mold 11, and applying the photoresist 20 to the mask 2.
A method for manufacturing a cylindrical mesh inner cutter for an electric shaver according to claim 1, wherein the inner cutter is formed by exposing the outer periphery of the cutter to light and developing the cutter.