JP2831086B2 - Outer blades such as electric razors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an outer blade provided in an electric razor, an electric pill remover, or the like.

[Conventional technology]

As an outer blade of this type, for example, as shown in FIGS. 14 and 15, the cross-sectional shape of the inter-hole rib 2 forming a large number of hair introduction holes 1 is such that the outer surface 3 is an arc having an outer convex shape. And a countersink 20 on the flat inner blade sliding surface 4a of the inner surface 4 (see Japanese Patent Application Laid-Open No.
62-38191). Then, as shown in FIG.
Is caught by a cutting edge 7 formed at the intersection of the outer surface 3 of the outer cutter and the sliding surface 4a of the inner cutter, and cut by the cutting edge of the inner cutter 8.

[Problems to be solved by the invention]

However, in the outer blade having the inter-hole rib 2 having the above-described cross-sectional shape, the blade edge portion 7 is formed on the inner blade sliding surface 4a. Therefore, the hair A does not cut off from the root by the thickness t of the inter-hole rib 2 but remains by the length a from the surface of the skin S. Even if the thickness t of the inter-hole rib 2 is reduced to enable so-called deep shaving, in order to secure the mechanical strength of the outer blade, at most 40 μm of the nickel electroformed outer blade and the outer shape by press molding are used. It is said that 45 μ is the limit with the blade, and it is inevitable that the hair A is left by the thickness t of the rib 2 between the holes.

Further, since the flat inner cutter sliding surface 4a of the outer cutter is separated and independent for each hole as shown in FIG. 14, the cutting edge of the inner cutter 8 slides discontinuously with respect to the inner surface 4 of the outer cutter. Therefore, the edge of the inner blade 8 is easily chipped, and the noise generated by discontinuous sliding of the inner blade 8 is high. Further, since the inner cutter sliding surface 4a of the outer cutter is formed on both sides of the counter sink 20, the area of the flat inner cutter sliding surface 4a is large, and the load current is correspondingly large. In addition, the accumulation of skin fatty acids in the countersink 20 on the inner blade sliding surface 4a also causes an increase in load current.

The present invention has been made in order to solve such a problem, and an object of the present invention is to make it possible to cut the hair as far as possible, to reduce noise, improve durability, and reduce load current.

It is another object of the present invention to enable sharp shaving.

[Means for solving the problem]

In the outer cutter of the present invention, for example, as shown in FIG. 1, in the cross-sectional shape of the inter-hole rib 2 forming the hair introduction hole 1, the so-called conventional inner cutter sliding surface 4a and the cutting edge 7 are made independent. And the cutting edge 7 is set at a higher position which is deviated to the outer surface 3 side than the inner blade sliding surface 4a. That is, an outer convex hair introduction curved surface 3b is formed on the outer surface 3 of the inter-hole rib 2 on the side of the hair introduction hole 1, and an inner blade sliding surface 4a is formed on the inner surface 4 thereof. 5, a cutting edge 7 is formed at a position closer to the bristle introducing hole 1 and closer to the outer surface 3 than the position of the edge 6 of the inner blade sliding surface 4a on the bristle introducing hole 1 side. Set to position. The edge 5 of the hair introduction curved surface 3b and the edge 6 of the inner blade sliding surface 4a are connected by an inner blade relief surface 4b.

As the amount of deviation of the cutting edge portion 7 toward the outer surface 3, the height h of the cutting edge portion 7 from the inner blade sliding surface 4 a is 0 <h ≦
It is set to be 15 μm.

[Action]

In this case, the hair introduction curved surface 3b of the outer blade functions to smoothly introduce the hair A of the skin S applied to the outer surface 3 into the hair introduction hole 1.

As shown in FIG. 3, the bristle A introduced into the bristle introducing hole 1 is located at the root side of the bristle A by the amount that the cutting edge 7 is biased toward the outer surface 3 from the position of the inner blade sliding surface 4a. And is cut by the shearing action with the cutting edge of the inner blade 8, but the cutting edge 7 of the outer blade does not contact the inner blade 8.

The height h of the cutting edge 7 from the inner blade sliding surface 4a is 15 μm.
Because of the following, it is possible to obtain an appropriate clearance for the thickness of the hair (usually 80 to 120 μm) between the edge of the inner blade 8 and the hair, and to clean the hair without tearing the hair or leaving it uncut. Works to cut into cuts.

〔The invention's effect〕

 According to the outer cutter of the present invention, the following effects can be obtained.

(I) Since the blade tip 7 is set at a position closer to the outer surface 3 than the inner blade sliding surface 4a, the blade tip 7 can be brought as close as possible to the root of the bristles A, thereby enabling deep shaving.

(Ii) Since the cutting edge portion 7 does not contact the cutting edge of the inner cutter 8 in principle, it has less wear, does not crack the outer cutter, and has excellent durability.

(Iii) Since the conventional countersink is eliminated on the inner surface 4 of the inter-hole rib 2, the area of the inner blade sliding surface 4a can be reduced in the area of sliding with the inner blade 8 as compared with the conventional outer blade. In addition, since there is no accumulation of fatty acids in the counter sink, an effect of reducing the load current can be expected.

(Iv) Since the inner blade sliding surface 4a can be formed continuously on the inner surface of the inter-hole rib 2, the sliding with the inner blade 8 is performed continuously, so that the noise is reduced and an abnormal sound may be generated. It can be reduced compared to the conventional case.

(V) Since the hair introduction curved surface 3b is formed as an outwardly convex curved surface, the hair can be smoothly introduced into the hair introduction hole 1 without causing any damage even when the skin is pressed thereon. .

(Vi) Since the ribs 2 between the holes have a cross-sectional structure similar to those of the conventional countersink 20 in which the thickness is increased, the rib strength is increased, and the conventional strength can be obtained even if the thickness of the entire outer cutter is reduced. And can respond to thinning.

(Vii) Even when the outer cutter is manufactured by electroforming, conventional primary electroforming can be omitted, and electroforming can be performed at a low cost with a small number of steps.

(Viii) Furthermore, since the height h of the cutting edge portion 7 from the inner blade sliding surface 4a is set to 0 <h ≦ 15 μm, it is possible to enable good shaving and deep shaving, which is advantageous. is there.

〔Example〕

An embodiment of the outer cutter according to the present invention will be described with reference to the drawings.

In FIG. 1 and FIG. 2, the outer blade comprises a number of hair introduction holes 1 and inter-hole ribs 2 forming the hair introduction holes 1. The shape of the hair introduction hole 1 can be formed in an elliptical shape, a circular shape, or other various polygonal shapes in addition to the square shape as shown in plan view.

The cross-sectional shape of the inter-hole rib 2 is formed in a substantially sector shape surrounded by the outer convex outer surface 3 and the inner convex inner surface 4.

The outer surface 3 of the inter-hole rib 2 has a substantially arc-shaped top surface 3a drawn with a large radius of curvature, and left and right hair introduction curved surfaces 3b, 3b continuously formed on the hair introduction hole 1 side of the top surface 3a. It is formed in an elliptical shape. The hair introduction curved surface 3b is drawn with a radius of curvature smaller than the radius of curvature of the top surface 3a. Instead of forming the top surface 3a in an arc shape, the top surface 3a may be formed flat as shown in FIG. 8, but by forming the hair introduction curved surface 3b in an outwardly convex arc shape, the skin S The hair A is smoothly introduced into the hair introduction hole 1 so as not to cause any damage even when it comes into contact with the hair.

On the other hand, the inner surface 4 of the inter-hole rib 2 has the inner blade sliding surface 4a, the left and right end edges 6 of the inner blade sliding surface 4a on the hair introduction hole 1 side, and the left and right hair introduction curved surfaces 3b on the hair introduction hole 1 side. It is composed of left and right inner blade relief surfaces 4b, 4b connecting each edge 5, and a cutting edge 7 is formed at the intersection of the inner blade relief surface 4b and the hair introduction curved surface 3b.

As shown in FIG. 3, the cutting edge 7 cuts the bristle A into the bristle introducing hole 1 so that the bristle A introduced into the bristle introducing hole 1 can be caught as much as possible at the root side thereof and between the bristle A and the cutting edge of the inner blade 8. It is set to be able to. For this purpose, the edge 5 of the bristle introduction curved surface 3b forming the cutting edge portion 7 is located closer to the bristle introduction hole 1 and closer to the outer surface 3 than the position of the end edge 6 of the inner blade slide surface 4a. It is set to become.

For example, in the case of an outer blade of a reciprocating electric razor or a rotary electric razor, as shown in FIG. ₁ , the width W1 of the inner blade sliding surface 4a of the inter-hole rib 2 is 70 to 120 μm and the inner blade relief surface. the width W ₂ of 4b and 40 to 60 [mu] m, if the thickness t was 35～65Myuemu, the height h from the inner cutter sliding surface 4a of the cutting edge portion 7 2~15μ
m, more preferably 5 to 10 μm. Its height h
Is the clearance between the cutting edge 7 and the inner blade 8, but since the thickness of the bristle A is slightly smaller than the normal thickness of 80 to 120 μm, there is basically no problem in cutting the bristle A.

In the outer cutter of the electric rotary shaver, the width W ₁ of the inner cutter sliding surface 4a of the hole between the ribs 2 70 to 120, the width W ₂ of the inner blade relief surface 4b and 60-100, the thickness t Is 90 to 120 μm, the height h of the cutting edge portion 7 from the inner blade sliding surface 4a is 2 to
It is 15 μm, more preferably 5 to 10 μm.

When the height h of the cutting edge portion 7 exceeds 15 μm, sharpness sharply decreases, and when it is 2 μm or less, the wear time of the inner blade sliding surface 4a is accelerated.

FIG. 6 shows the results of a sharpness test using a nylon bag (a substitute for hair). In this figure, the vertical axis represents the good cutting rate (%), and the horizontal axis represents the height h (μm) of the cutting edge 7.

This is done by inserting 10 rods (150 μm in thickness) through the hair introduction hole 1 of the outer blade and cutting it in cooperation with the inner blade 8.
It shows the ratio of those whose cut edges are cut cleanly. The good cutting rate curve shows an average value obtained by performing 10 times for each 1 μm unit. Here, a clean cut a as shown in FIG. 7 (a) was accepted, and a cut b which was cut off as shown in FIG. 7 (b) and a cut c which was not cut as shown in FIG. 7 (c) were accepted. I failed.

According to this figure, it can be seen that when the height h of the cutting edge 7 exceeds 15 μm, sharpness sharply decreases.

For example, when the width W of the inter-hole rib 2 is 300 μm and the thickness t is 100 μm as the outer blade of the rotary electric shaver, the width w ₁ of the inner blade sliding surface 4 a is 80 μm, and the inner blade escape surface 4 b is width w ₂ is set to 110μ. By doing so, the area of the inner blade sliding surface 4a was reduced by 30 to 50% as compared with the conventional product.

Next, the case where the outer cutter having such a cross-sectional shape is manufactured by electroforming will be described in the order of the electroforming steps shown in FIGS. 5 (a) to 5 (g).

First, as shown in FIG. 5A, a photoresist 10 is uniformly applied to the surface of a conductive matrix, for example, an aluminum matrix 9. As the resist 10, for example, a resist having thermoplasticity, for example, a rubber-based resist is used. Next, as shown in FIG. 5 (b), a network-patterned film 11 is brought into close contact with the photoresist 10, and each process of baking, developing and drying is performed, as shown in FIG. 5 (c). A resist film 12 having a desired mesh pattern is formed.

Next, as shown in FIG. 5D, both edges of the resist film 12 (the inner blade escape surface 4b of the outer blade)
(A portion corresponding to) is formed into a shape in which the resist film 12 is gently and substantially uniformly sloping, that is, the resist film 12 is formed in a cross-sectional streamline shape.

Next, the matrix 9 is subjected to a peeling treatment. In this stripping treatment, for example, the stripping film 14 is electrolytically immersed in a 4 to 5% sodium hydroxide solution (normal temperature) to form a stripping film 14 on the surface of the matrix 9 not covered with the resist film 12 (FIG. 5 ( e)). In this case, the release film 14 may be formed on a thin nickel layer beforehand. In addition, as this peeling treatment, a peeling film 14 is formed by dipping in a selenous acid solution of about 1%. In this case, the treatment can be performed only by dipping for several seconds to several tens of seconds. Furthermore, any treatment may be used as long as it forms chromic acid and other appropriate oxide films.

Next, the aluminum matrix 9 is immersed in, for example, a nickel sulfamate bath to perform nickel electroforming.

An example of the composition and plating conditions of this nickel sulfamate bath is shown below.

Nickel sulfamate 450g / Boric acid 30g / Class 1 brightener appropriate amount (eg, saccharin sodium 0.08g /) Class 2 brightener appropriate amount (eg, butynediol 0.03g /) Bath temperature 50 ° C PH 4.0 ~ 4.5 Stir Air stir ( Bubbling and cathode rotation Current density 5 to 7 A / dm ^{2 By} this nickel electroforming, an electrodeposition layer 15 serving as an outer blade is formed on the release film 14 of the aluminum matrix 9 as shown in FIG.
Is formed.

Finally, the electrodeposited layer 15 is peeled off from the aluminum matrix 9 to form an electroformed layer comprising a large number of hair introduction holes 1 and inter-hole ribs 2 having a predetermined cross-sectional shape as shown in FIG. A blade product is obtained.

(Another embodiment)

In forming the inner blade relief surface 4b as a concave arc surface, in the above embodiment, as shown in FIG. 5 (d), the resist film 12 is subjected to after-baking while keeping the matrix 9 horizontal, so that FIG. g) Left and right symmetric inner blade relief surface 4b as shown in g)
An outer blade having 4b is obtained. Alternatively, as shown in FIG. 9 (a), the resist film 12 is formed in the same manner as in the above embodiment, and the matrix 9 is vertically set. The upper edge 12a of the resist film 12 can be formed to be thinner and smoother than the lower edge 12b by after-baking the film 12 or blowing hot air obliquely from above. By forming the resist film 12 in this manner, the resist film 12 is thereafter subjected to a release film forming step shown in FIG. 9B and an electrodeposition step shown in FIG. As shown in the figure, an outer blade having left and right asymmetric inner blade relief surfaces 4b, 4b, that is, an outer blade having one direction can be obtained. In this case, as shown in FIG. 10, the inner cutter relief surface 4b formed corresponding to the upper edge 12a of the resist film 12 is located on the lower side in the traveling direction X of the inner cutter 8.

Also, instead of forming the inner blade relief surface 4b in a concave arc shape,
As shown in FIG. 11, the inner blade relief surface 4b may be formed in a linear shape that is inclined upward from the edge 6 of the inner blade sliding surface 4a toward the cutting edge 7.

It is preferable that the inner blade relief surface 4b is formed in a concave arc shape or a straight shape with an upward slope. If the inner blade relief surface 4b is formed in such a shape, the area of the inner blade sliding surface 4a increases as the inner blade sliding surface 4a wears due to the sliding contact with the inner blade 8. Therefore, the wear rate can be slowed down and the life can be prolonged. It is also advantageous in that some deformation of the rib 2 between holes can be absorbed. That is, even if the outer blade is pressed locally by the skin S, the edge of the inner blade 8 may hit the inner blade relief surface 4b as shown in FIG. As shown in FIG. 7B, the cutting edge of the inner blade 8 slides on the inner blade relief surface 4b and is smoothly guided to the inner blade sliding surface 4a.

Further, as shown in FIG. 12, the inner blade sliding surface 4a is
If formed, the friction with the inner cutter 8 can be further reduced. As a material of the lubricating layer 16, for example, a composite plating of boron nitride or polytetrafluoroethylene is used. The manufacturing process of the outer cutter having the lubricating layer 16 is as shown in FIGS. This manufacturing process diagram is exactly the same as the manufacturing process of FIGS. 5 (a) to 5 (e) of the above embodiment, and the subsequent processes are slightly different. That is, after forming the release film, as shown in FIG. 13 (f), a composite plating of boron nitride or polytetrafluoroethylene is performed on the release film 14 to form the lubricating layer 16. After the formation of the lubricating layer 16, the electrodeposition layer 15 is formed in the same manner as in the above embodiment, and finally the electrodeposition layer 15 is peeled off from the matrix 9 together with the lubricating layer 16.

Further, if the height of the lubricating layer 16 is matched with the height h of the cutting edge portion 7 and the lubricating layer 16 is colored red, blue or the like with a pigment, the colored layer disappears with use. Since the state is an indication that the outer blade has reached the limit of use, it is easy to visually recognize the life time of the outer blade.

The outer blade of the present invention can be similarly applied to an outer blade such as a pill remover in addition to an electric shaver. In addition, this outer blade has an inner blade sliding surface 4a formed continuously on the inner surface of the inter-hole rib 2, and the inner blade 8 continuously hits the outer blade, so that the inner blade has a reverse rotation function, Before shaving the hair, reverse the rotation for about 3-5 seconds,
The edge of the inner blade 8 can be smoothed. Then return to normal rotation and shave. In this case, the hardness of the inner blade sliding surface 4a is set higher than that of the inner blade, and the edge of the inner blade 8 is leveled at this portion.

[Brief description of the drawings]

1 to 5 (a) to (g) show an embodiment of the outer blade according to the present invention, FIG. 1 is an enlarged sectional view of a main part, and FIG. 2 is an inner surface side of the outer blade. FIG. 3 is a cross-sectional view showing a shaved state, FIGS. 4 (a) and (b) are cross-sectional views showing a state of absorbing local deformation of an outer blade, and FIGS. (G) is a manufacturing process diagram by electroforming of the outer cutter. FIG. 6 shows a curve diagram of the good cutting rate. FIGS. 7 (a) to 7 (c) show hair cuts,
FIG. 7 (a) shows a good cut, and FIGS. 7 (b) and 7 (c) show a bad cut. FIG. 8 is a sectional view of a main part of an outer blade showing another embodiment of the present invention. 9 (a) to 9 (d) are views showing a manufacturing process of an outer blade by electroforming according to still another embodiment of the present invention, and FIG. 10 is a sectional view of a main part of the outer blade obtained by the electroforming. It is. FIG. 11 is a sectional view of a main part of an outer blade showing still another embodiment of the present invention. FIG. 12 is a sectional view of a main part of an outer blade showing still another embodiment of the present invention, and FIGS. 13 (a) to 13 (h) are manufacturing process diagrams of the outer blade. 14 and 15 show an outer blade of a conventional example, FIG. 14 is a perspective view of the inner side of the outer blade, and FIG. 15 is a sectional view showing a shaved state. 1 ... hair introduction hole, 2 ... rib between holes, 3 ... outer surface, 3b ... hair introduction curved surface, 4a ... inner blade sliding surface, 4b ... inner blade relief surface, 5 ... hair introduction curved surface Edge, 6: Edge of sliding surface of inner blade, 7: Blade edge, 8: Inner blade.

Claims (1)

(57) [Claims] 1. A plurality of hair introduction holes (1), and a hair introduction hole (1).
And an outer convex hair introduction curved surface (3b) is formed on the outer surface (3) of the inter-hole rib (2) on the side of the hair introduction hole (1), and the hole is formed. The inner blade sliding surface (4a) is formed continuously on the inner surface (4) of the inter-rib (2), and the edge (5) of the bristle introduction curved surface (3b) on the side of the bristle introduction hole (1) is formed on the edge (5). 7), and the cutting edge (7) is located closer to the hair introduction hole (1) than the edge (6) of the inner blade slide surface (4a) on the hair introduction hole side, and the outer surface is formed. (3) The edge (5) of the bristle introduction curved surface (3b) and the edge (6) of the inner blade sliding surface (4a) are set at the side offset position, and the inner blade relief surface (4b) The height (h) of the cutting edge (7) from the inner blade sliding surface (4a) is
An outer blade such as an electric razor, wherein 0 <h ≦ 15 μm is set.