JPH0133554B2 - - Google Patents

Description

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

Conventionally, when manufacturing a mesh outer blade for an electric shaver by electroforming, an insulating film 2 is generally formed on the surface of a matrix 1 as shown in FIG. 1 at a portion corresponding to the hair introduction holes of the outer blade. Then, on the surface of the matrix 1 that is not covered by the insulating film 2, a metal 3 that protrudes beyond the thickness of the insulating film 2 is firstly electrodeposited.
After performing a peeling treatment on the surface of the next electrodeposited metal 3,
Further, secondary electrodeposition of metal 4 that will become the outer blade is performed. Finally, the secondary electrodeposited metal 4 is peeled off, and a rib 7 with a hair introduction hole 5 and a countersink 6 formed on the back side surrounding the hair introduction hole 5 as shown in FIG.
The mesh-like outer cutter 8 is obtained. However, the mesh-shaped outer cutter 8 manufactured by such a method can only have a uniform cutting edge angle α, and cannot be manufactured by freely changing the cutting edge angle α to be large or small. In particular, it is difficult to obtain a sharp cutting edge that can attract hair well and provide a close shave by reducing the cutting edge angle α. Furthermore, this method requires a step of primary electrodeposition to form the countersink 6 to reduce the frictional resistance with the inner cutter, which has the disadvantage of increasing the number of man-hours and increasing costs.

The present invention has focused on this fact, and aims to provide a method for manufacturing a mesh outer blade for an electric shaver, which can easily obtain a sharp cutting edge and can omit the primary electrodeposition process. It is.

The details will be explained below based on the drawings.

As shown in Figures 3 and 4, copper, aluminum,
A part of the surface of a thin metal plate 10 made of stainless steel or other material having at least conductivity on its surface, which corresponds to the ribs of the mesh outer cutter, is made to protrude by press working to form a protrusion 11 having a mountain-shaped cross section, A recess 12 is formed by recessing a portion of the mesh outer cutter corresponding to the hair introduction hole, and a protrusion 11 is inserted into the recess 12.
An electroforming mother mold 14 is prepared by forming an electrical insulating film 13 made of epoxy synthetic resin or the like at a height lower than the protrusion height.
In this case, in order to improve the bond between the metal plate 10 and the electrical insulating film 13, the recesses 12 may be finished with a matte finish, or through holes may be provided in the recesses 12 and filled from the back side of the metal plate 10. The plate 10 is made of a clad material, the surface side is made of a metal layer to which synthetic resin can easily bind, and the protrusion 1 is formed by press working on the lower surface side.
A metal layer that maintains accuracy of 1 may be used.

Next, as shown in FIG. 5, using this electroforming master mold 14, the exposed top surface of the protrusion 11 that is not covered with the insulating film 13 is subjected to a peeling treatment, and then a metal 15 such as nickel is applied to the surface. By electrodepositing and finally peeling off the electrodeposited metal 15, a mesh having a hair introduction hole 16 and ribs 18 surrounding the hair introduction hole 16 and having a countersink 17 formed on the back side as shown in FIG. 6 is formed. A shaped outer cutter 19 can be obtained.

The chevron-shaped protrusions 11 of the electroforming mother mold 14 forming the ribs 18 are determined by the selection of the press, that is, the shape of the punch,
By changing the drawing depth etc., the height,
The slope can be changed arbitrarily, and a rib 18 having a desired height and slope can be obtained accordingly.

As explained above, according to the manufacturing method of the present invention, the protrusions 11 are formed by protruding the portions of the surface of the metal plate 10 having conductivity on the surface that correspond to the ribs 18 of the mesh outer cutter 19. In addition, since the electroforming mold 14 is used, the part corresponding to the hair introduction hole 16 is depressed to form a recess 12, and the insulating film 13 is formed in the recess 12 at a height lower than the protrusion height of the protrusion 11. During electroforming, it is only necessary to electrodeposit the metal 15 that will become the outer blade on the exposed surface of the protrusion 11 of the mother mold 14, and the conventional primary electrodeposition process can be omitted, resulting in a low cost with fewer steps. Mesh outer blade 19
can be obtained. Furthermore, the protrusion 11 formed by protruding the metal plate 10 by press working can be formed into a convex curved surface with a low protrusion height and a gentle slope by selecting a press.
As a result, it is possible to obtain ribs 18 with a small cutting edge angle α and a gently convex curved surface, which makes it possible to better guide hair into the hair introduction holes 16 and improve the close shaving effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view for explaining a conventional method for manufacturing a mesh outer cutter for an electric shaver, and FIG. 2 is a partially enlarged sectional view of the mesh outer cutter obtained by the method. Fig. 3 is a perspective view of an electroforming matrix used in the method for manufacturing a mesh outer cutter for an electric shaver according to the present invention, Fig. 4 is a cross-sectional view thereof, and Fig. 5 is a state in which the matrix is electrodeposited. FIG. 6 is a cross-sectional view of a mesh-like outer cutter obtained by electrodeposition, and FIG. 7 is a partially enlarged cross-sectional view of the outer cutter. 10... Metal plate, 11... Protrusion, 12... Recess, 13... Insulating film, 14... Electroforming mother mold, 15...
... Electroplated metal, 16 ... Hair introduction hole, 17 ... Counter sink, 18 ... Rib, 19 ... Mesh outer blade.

Claims (1)

[Claims] 1. On the surface of the metal plate 10 having conductivity on the surface,
A portion of the mesh-like outer cutter 19 corresponding to the rib 18 is made to protrude to form a protrusion 11, and the hair introduction hole 1
A portion corresponding to 6 is depressed to form a recessed portion 12,
Using an electroforming mother mold 14 in which an insulating film 13 is formed in the recess 12 at a height lower than the protrusion height of the protrusion 11, the exposed surface of the protrusion 11 is subjected to a peeling treatment, and then a mesh outer cutter 19 is obtained. A method for manufacturing a mesh-like outer blade for an electric shaver, characterized in that metal 15 is electrodeposited.