JPS5825188A - Production of outer blade of electric razor - Google Patents

Abstract

(57) [Summary] 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 a mesh screen-like outer blade for an electric shaver, and the outer surface of the lip between the hair introduction holes of the outer blade can be easily and inexpensively made into a semi-circular cross-section. The purpose is to enable the formation of

Conventionally, it is known that if the lip between the hair introduction holes in this type of outer cutter is formed into a semi-circular cross-section, it will have a good texture and it will be very easy to draw the skin and beard into the hair introduction hole.

However, when the outer blade is cast by electroforming, the thickness of the lip that is formed between the bristles introduction holes to have a semicircular cross section must be made considerably large, which results in a long casting time. However, it had drawbacks such as high costs due to the use of large amounts of materials (nickel, nickel-cobalt alloys, etc.).

This invention was made to eliminate these drawbacks.)
The feature is that an ultraviolet or electron beam curable resin paint is applied to the surface of the outer blade body, which has a mesh screen shape and has a large number of hair introduction holes and lips between the hair introduction holes. Pull a vacuum from the back side of the outer blade body.
At the same time as removing the resin paint from the bristles introduction hole, the resin paint is left on the surface of the rib with a semi-circular cross section, and then the resin paint on the surface of the rib is cured by UV or electron beam irradiation. be.

The details will be explained below based on the drawings.

Figure 3 shows a partially enlarged cross-sectional view of the mesh screen-like outer blade of the electric shaver.The outer blade has numerous hair introduction holes 1.
and a rib 2 between the hair introduction holes 1 and 1.
It consists of a coating film 4 with a semicircular cross section formed on the surface of the rib 2.

The outer cutter main body 3 is cast by electroforming using nickel or an alloy of nickel and cobalt, and its rib 2 has a semicircular cross section and a cutting edge 5. The thickness tl of the outer cutter main body 3 is extremely thin, about 15 to 20 μm.

The coating film 4 is formed by pressing on the surface of the rib 2 as follows. First, as shown in FIG. 11, a highly viscous resin paint 6, such as an unsaturated polyester resin or a thiol olefin resin, which is curable with ultraviolet rays or electron beams, is applied to the surface of the outer blade main body 30 using a roll coater or the like. Next, this outer cutter main body 3 is placed on a vacuum cylinder 7 (jig) as shown in FIG. As shown in Figure 2, the resin paint 6a on the J-inlet hole 1 portion is removed. Due to this suction removal, rib 2
The resin paint 6b is left on the surface with a semicircular cross section. Thereafter, the resin coating 6b on the surface of the rib 2 is cured by irradiation with ultraviolet rays or electron beams to form a coating film 4 having a semicircular cross section. The thickness tl of the coating film 4 is approximately 65 to 80μ for the dome-shaped outer blade of a rotary electric shaver), and 30 to 45μ for the flat plate-type outer blade of a vibrating electric shaver. 0 If the outer cutter is manufactured in this way, the rib 2 having a semi-circular cross section can be easily formed by applying the resin paint 6 to the surface of the outer cutter body 3 and then sucking air from the back side. However, the time required for this is the electroforming method.
It is also possible to significantly shorten the time required to form the material into a semi-circular cross-sectional shape. Moreover, the radius of the rib 2, which has a semi-circular cross-section, can be achieved by vacuuming the high viscosity resin paint 6 through the hair introduction hole 1, and the natural radius can be created with the help of surface tension. It can be gently introduced into the introduction hole 1.

Furthermore, by increasing the thickness of the coating film 4, sufficient strength can be obtained, and the outer cutter main body 3 can be made extremely thin. Therefore, the electroforming time for the outer blade body 3 is shortened, and in combination with the use of ultraviolet and electron beam curable resin paints 6, which have a quick curing time, as the material for the coating film 4, the manufacturing efficiency of the outer blade is improved. Can be done. Furthermore, it is possible to reduce the amount of electroformed materials such as nickel and alloys of nickel and cobalt, thereby reducing material costs.

Note that the outer cutter main body 3 can also be made by pressing an extremely thin stainless steel plate instead of being cast by electroforming.

Further, as a means for applying the ultraviolet ray or electron beam curable resin coating 6 to the surface of the outer blade main body 30, a dip coating method may be employed in addition to the above-mentioned roll coater. In the case of the dip coating method, the resin paint 6 is applied to both the front and back surfaces of the outer blade body 30, but the resin paint 6 on the back side is coated with the resin paint 6 on the surface side of the vacuum electrode by irradiation with ultraviolet rays or electron beams as described above. After curing, it can be removed with a cleaning solvent.

As explained above, according to the present invention, there are a step of applying ultraviolet rays and electron beam curable resin paint 6 to the surface of the outer cutter main body 3, a step of vacuuming from the back side of the outer cutter main body 3 after application, and There is an advantage that the outer cutter of the electric shaver having the rib 2 having a semi-circular cross section can be manufactured very simply and at low cost through the process of curing by electron beam irradiation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view showing a state in which resin paint is applied to the surface of the outer blade body, and FIG.
The figure is a cross-sectional view showing the vacuum evacuation state, Figures 4 to 13 are cross-sectional views of the finished state, and Figure 4 is a cross-sectional view showing an example of the vacuum evacuation device. DESCRIPTION OF SYMBOLS 1... Hair introduction hole, 2... Rib, 3... Outer blade body, 4... Paint film with semi-circular cross section, 6... Ultraviolet ray, electron beam curable resin paint. Patent applicant Kyushu Hitachi Maxell Co., Ltd.
1 Figure 6 Figure 4

Claims (1)

[Claims] (1) A large number of hair introduction holes 1 and a lip 2 between the hair introduction holes 1-1
After applying ultraviolet ray or electron beam curable resin paint 6 to the surface of the outer cutter main body 3 having a mesh screen shape, vacuum is applied from the back side of the outer cutter main body 6. The resin paint 6a is removed, and the resin paint 6b is left on the surface of the lip 2 with a semicircular cross section.
Thereafter, the resin coating 6b on the surface of the lip 2 is cured by ultraviolet rays or electron beam irradiation to form a coating film 4 having a semicircular cross section.