JPH0115595B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an outer cutter for an electric shaver, and more particularly to a method for forming a convexly curved outer cutter base by an electrodeposition method.

[Conventional technology]

Generally, when a convexly curved outer blade base is formed by electrodeposition, the wall thickness at the top side, which is a high position, becomes thicker, while the wall thickness at a lower position, at the periphery side, tends to be thinner. For this reason, uniform strength of the outer blade base cannot be obtained.

[Problem that the invention seeks to solve]

Conventionally, the size of the hair introduction holes on the peripheral side was made smaller than the size of the hair introduction holes on the top side in an attempt to obtain uniformity in strength. With this method, the aperture ratio of the peripheral portion is forced to decrease.

[Means for solving problems]

In forming a convexly curved outer blade base having a large number of hair introduction holes scattered therein by electrodeposition, the present invention provides a method for forming a convexly curved outer blade base on the main surface of a convexly curved electrodeposition matrix corresponding to the hair introduction holes. An electrically insulating thin film is formed, and an isolated notch is formed in each thin film to expose the main surface of the electrodeposition matrix, and the area of each notch is increased as the area of the thin film is formed at a higher position. An electric shaver that can uniformly increase the strength of the entire outer blade base without sacrificing the aperture ratio of the hair introduction holes by electrodepositing on the main surface of the matrix after setting the The purpose of the present invention is to provide a method for manufacturing an outer cutter.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outer blade of a rotary electric shaver obtained by the manufacturing method of the present invention, in which 1 is an outer blade base made of nickel or the like and formed in a convexly curved shape, for example, a dome shape; Numeral numerals 3 and 4 designate a large number of hair introduction holes formed in the outer blade base 1, an inner blade 3, and an outer blade holder.

Next, the method for manufacturing the above-mentioned outer cutter will be explained step by step.

First, as shown in FIG.
An electrically insulating thin film 22 is formed on the main surface of the hair insulating film 22 at a portion corresponding to the hair introduction hole 2 described above.
Isolated notches 23, 23 ₁ . . . 23 _o are formed in each of these thin films 22 as shown in FIG. 3, so that the main surface of the matrix 21 is partially exposed.

The surface area of these notches 23 is proportional to the position of the above-mentioned hair introduction hole 2 in the height direction, that is, the notch 23 ₁ located on the top 1a side is
It is set to be larger than the notch _23o present on the side of the hem 1b. The thin film 22 is formed by a well-known method, that is, by uniformly coating the main surface of the matrix 21 with a photosensitive resin that is cured and insoluble by light and has chemical resistance and electrical insulation properties. A positive printing plate is attached to the film, and then the printing and developing processes are performed.

The matrix 21 on which the thin film 22 has been formed is immersed in an electrodeposition layer (not shown) to perform primary electrodeposition, and the primary electrodeposition is performed on the conductive surface of the matrix 21 to a thickness exceeding the thickness of the thin film 22. Form layer 24 (FIG. 4).

By this primary electrodeposition, the above-mentioned notches 23, 23
Unnecessary electrodeposited layers 24 1 and 24 _o , which do not become a product, are also formed on the portions _{1 and} 23 _o that exceed the thickness of the thin film 22 as so-called waste electrodeposited portions, and in this state, the peripheral portion of the notch 23 is also electroplated. It is held down by the adhesive, preventing it from turning up and lifting up, and preventing it from shifting due to external forces or other liquids in the next process.

Next, the matrix 21 is immersed in an aqueous solution of potassium dichromate or the like to perform a peeling treatment, and then secondary electrodeposition is performed to coat the surface of the primary electrodeposited layer 24 with the coating shown in FIG. A second electrodeposited layer 26 having a required thickness as the outer blade base 1 is formed as shown in FIG. Through this secondary electrodeposition, the electrodeposition layers 24 ₁ , 24 _o
Electrodeposition layers 26 ₁ and 26 _o as sacrificial electrodeposition portions are formed thereon.

After the second electrodeposition, if the matrix 21 is pulled up from the electrodeposition layer and the second electrodeposition layer 26 is peeled off from the peeling surface, the second electrodeposition layer 26 will be removed as shown in FIG. constitutes a rib portion between the hair introduction holes 2, and further has a countersink portion 27. An outer cutter is obtained. When the secondary electrodeposition layer 26 is peeled off, the electrodeposition layers 24 ₁ , 24 _o and the electrodeposition layer 26 ₁ , 24 o as the sacrificial electrodeposition parts are removed.
26 _o are isolated at the portions corresponding to the hair introduction holes 2, and are therefore left on the matrix 21 side.

Here, prior to electrodeposition, each electrically insulating thin film 22
On the other hand, since the notches 23 ₁ , 23 _o are formed with larger areas at higher positions, the electrodeposited metal is also electrodeposited on the notches 23 ₁ , 23 _o , so that the electrodeposited metal increases per unit area. In the case of electrodeposition in which approximately the same amount is deposited, in the regions where the notches 23 ₁ and 23 _o are provided, the amount deposited in the notches 23 ₁ and 23 _o is reduced, so that The amount of precipitation on the side portions decreases, and as a result, when hair introduction holes with the same opening area are scattered in the matrix 21, the amount of precipitation on the side portions becomes smaller.
The thickness t ₁ of the part on the a side is thinner, and the thickness t _o of the part on the hem 1b side is thicker, so that the overall thickness can be equalized, and the aperture ratio of the hair introduction hole 2 can be increased. You can avoid sacrificing

In the above embodiment, a dome-shaped outer cutter is used as an example, but the same effect can be achieved even with a dome-shaped outer cutter. It can also be applied to an outer cutter that is three-dimensionally electroformed so as to curve in an arch shape.

〔effect〕

As described above, in forming the convexly curved outer cutter base 1 in which a large number of hair introduction holes 2 are scattered by electrodeposition, the present invention provides a convexly curved electrodeposition corresponding to the hair introduction holes 2. An electrically insulating thin film 22 is formed on the main surface of the matrix 21, and isolated cutouts 23 are formed in each thin film 22 to expose the main surface of the electrodeposition matrix 21, and the area of each cutout 23 is The thin film 22 located at a higher position is set to have a larger value, and then electrodeposition is performed on the main surface of the matrix 21 to equalize the amount of electrodeposition as a whole and form the openings. The strength can be increased without sacrificing efficiency, the opening area and layout of the hair introduction holes can be freely set, and an outer blade of an electric shaver with a high degree of freedom in design can be provided.

Moreover, in the actual manufacturing process, for example, it is only necessary to add a notch to the mask screen, and there is no need to set up a special process or improve equipment, making it a low-cost and efficient manufacturing method. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the outer blade of an electric shaver obtained by the manufacturing method of the present invention, and FIGS.
The figure is a partial sectional view showing the manufacturing method of the outer cutter in order of steps. DESCRIPTION OF SYMBOLS 1... Outer blade base, 2... Hair introduction hole, 21... Matrix, 22... Electrically insulating thin film, 23, 23 ₁ , 2
3 _o ... Notch, 24... Primary electrodeposition layer, 26...
...Second electrodeposition layer, 24 ₁ , 24 _o , 26 ₁ , 26 _o ...
...Unnecessary electrodeposition layer.

Claims (1)

[Claims] 1. When forming the convexly curved outer blade base 1 in which a large number of hair introduction holes 2 are scattered by electrodeposition, on the main surface of the convexly curved electrodeposition matrix 21 corresponding to the hair introduction holes 2, An electrically insulating thin film 22 is formed on each thin film 22, and each thin film 22 has an isolated cutout 2 in which the main surface of the electrodeposition matrix 21 is exposed.
3 is formed respectively, and the area of each notch 23 is set to be larger as the thin film 22 located at a higher position is formed, and then electrodeposition is performed on the main surface of the matrix 21. A method of manufacturing an outer blade of an electric razor.