JPS5923232B2 - Inner blade of reciprocating electric shaver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner blade of a reciprocating electric shaver.

The purpose of the present invention is to increase the rigidity of the inner cutter to reduce deformation of the inner cutter during grinding after forming the inner cutter, reduce warpage, improve cutting quality, and reduce noise. With,
Because the inner cutter has strong rigidity, the planar area when looking at the support from the outer cutter surface can be reduced, reducing the flow of air on the inner cutter due to the reciprocating movement of the inner cutter, and preventing the inner cutter from removing shavings. In addition to preventing the beard from scattering by making it fall smoothly into the body,
The purpose is to reduce the amount of debris clogging the inner blade and to make it easier to clean the debris.Another purpose is to make the inner blade lighter and reduce the load on the inner blade when driving. Furthermore, it is an object of the present invention to prevent the adhesion of hair shavings to the inner blade body by preventing static electricity from being charged, and to further facilitate cleaning.

The inner blade of a conventional reciprocating electric shaver is supported by a glass fiber-reinforced thermoplastic resin and metal die-casting such as aluminum die-casting.

In the case of glass fiber-reinforced thermoplastic resin, it is electrostatically charged and shavings adhere to the inner blade, so it takes time to dispose of the shavings, and its rigidity is weak, so it cannot be used after forming the inner blade. In order to achieve the strength to withstand the grinding of the inner cutter, the support cannot be made thin, and it often gets clogged with shavings.
It is difficult to clean, and if the amount of glass fiber added is increased to improve mechanical strength and flexural modulus, moldability deteriorates and the specific gravity increases, which increases the load on the inner blade during driving. The disadvantage was that it increased.

In addition, in the case of metal die casting, the strength and bending elastic modulus are high, so the support body can be made thin, but the specific gravity is extremely large, so the inner blade becomes heavy, which increases the load when driving, and is expensive. It had the disadvantage of becoming

The present invention has been made in view of this point, and will be explained in detail below using actual cases.

In Figure 1, 2 is a support body made of 20 to 40 carbon fibers.
It is made of a thermoplastic resin with addition of nitrogen, and is designed to support a plurality of inner cutters 1 by integral molding.

At this time, at least both ends of the inner support 1 are supported by the support body 2.

This support 2 has increased rigidity due to the addition of carbon fibers, so the width of the support 2 can be reduced, and as a result, the total planar area viewed from the outer blade surface can be reduced.

Suitable thermoplastic resins for the base of the support 2 include polybutylene terephthalate, polyphenylene sulfide, polyamide, polysulfone, polyacetal, and the like.

Furthermore, the specific resistance of the added carbon fiber is 10-3Ω, which is extremely low compared to the specific resistance of glass fiber, which is 1015Ω-tan.
Because it has conductivity comparable to that of metals such as nichrome wire, it does not accumulate static electricity, prevents hair shavings from adhering to the inner blade, and makes cleaning easier.

Next, the mechanical properties of the thermoplastic resin to which carbon fibers are added are as follows.

Therefore, carbon fiber-containing thermoplastic resin has a lower specific gravity, extremely high specific strength, and specific elastic modulus compared to other materials, so it can reduce the load on the inner blade and has high rigidity. Therefore, the inner cutter body is not deformed during grinding after forming the inner cutter body, and warpage can be reduced, cutting quality can be improved, and noise can be reduced.

Further, the clogging of the inner cutter body with hair scraps can be reduced, and cleaning of the hair scraps can be facilitated.

Figure 3 shows polybutylene terephthalate (PBT) and polyphenylene sulfide (
This graph shows the relationship between the flexural modulus and the content of carbon fiber (CF) and glass fiber (GF) using PPS).For both resins, the flexural modulus is higher when carbon fiber is added. rate increases.

The flexural modulus of support 1 is 12 x 10'kg
/crtt.

As is clear from Figure 3, if the content of carbon fiber added is 20 parts or less, there will be less difference in mechanical properties such as rigidity compared to the case where glass fiber is added, and there will be no charging due to static electricity. Even if it has this feature, there is no merit, and if the content is higher than 40, the flow of the material during molding will be poor, resulting in poor moldability.

As described above, in the present invention, a plurality of inner cutters are arranged side by side and at least both ends of the inner cutter are supported by a support made of a thermoplastic resin containing 20 to 40% carbon fiber. The rigidity can be increased, which reduces deformation of the inner cutter during grinding after forming the inner cutter, and reduces warping, improving cutting quality and reducing noise.Moreover, the inner cutter can be made lighter, making it easier to drive. In addition, the load on the inner blade can be reduced, and it is also possible to prevent static electricity from being charged, preventing hair chips from adhering to the inner blade, making cleaning easier, and in addition, compared to those with glass fiber added. It has extremely excellent mechanical properties such as rigidity, and has the advantage of improving material flow during molding, resulting in good moldability.

In addition, since the support has strong rigidity, the planar area of the support when viewed from the outer cutter side can be reduced, which reduces the flow of air on the inner cutter due to the reciprocating movement of the inner cutter. This has the effect of not only making it possible to smoothly fall into the inner blade body and preventing the whiskers from scattering, but also reducing clogging of whisker debris in the inner blade body and making it easier to clean the whiskers.

[Brief explanation of drawings]

Figure 1 is a perspective view of an example of the inner blade of the reciprocating electric shaver of the present invention, Figure 2 is a top view of the same, and Figure 3 is the fiber content and flexural modulus of the support used in the same. FIG. 1... Inner blade, 2-... Support body.

Claims (1)

[Claims] 1. A reciprocating electric shaver characterized in that a plurality of inner cutters are arranged side by side and at least both ends of the inner cutters are supported by a support made of a thermoplastic resin containing 20 to 40% carbon fiber. Blade body.