JPS6238611Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cylindrical mesh inner cutter for a rotary electric shaver.

[Conventional technology]

Conventionally, as an inner cutter structure of a rotary electric shaver, for example, as shown in Japanese Utility Model Publication No. 40-17808, a plurality of blade-shaped inner cutters are mounted on the outer circumferential surface of a rotating cylinder through push-up springs. There is something stuck.

[Problem that the invention attempts to solve]

However, with this type of inner cutter structure, the cutting edge of the blade-shaped inner cutter comes into linear contact with the inner surface of the mesh outer cutter, so the mesh outer cutter is extremely thin for purposes such as close shaving. If the outer cutter is formed to have a dent in the inner cutter, skin pressure will cause the outer cutter to be locally dented between the inner cutter and the inner cutter that resists the skin pressure, and this deformed area will be scratched by the cutting edge of the inner cutter. or may be damaged. Moreover, with the above-mentioned inner cutter structure, it is troublesome to attach the inner cutter to the rotating cylinder, and hair particles may adhere to and accumulate on the outer peripheral surface of the rotating cylinder.
The drawback was that the hairs were easily blown out from the numerous hair introduction holes drilled in the mesh-like outer blade.

Therefore, the present invention has solved the above-mentioned conventional drawbacks, and has developed a rotary rotary blade that does not cause scratches even on the thin mesh outer blade, has a simple structure, is easy to assemble, and prevents hair from blowing out. A first object of the present invention is to provide a cylindrical mesh inner cutter for a type electric shaver.

A second object of the present invention is to further develop and improve the cylindrical mesh inner blade of a rotary electric shaver, which rotates quietly with less chatter and has good sharpness.

Furthermore, a third object of the present invention is to reliably prevent the mesh-like outer cutter from being scratched and torn due to the seam formed between the butt-welded edges of the cylindrical mesh-like inner cutter.

[Means for solving problems]

In order to achieve the first object described above, the present invention involves winding a rectangular mesh-like inner blade blank 13a having a large number of hair introduction holes 14, and winding the end edges 13b and 13.
b Butt welded together to form a cylindrical mesh inner blade 6
get. When the entire inner cutter 6 is formed in a cylindrical shape in this way, a part of the circumferential surface of the cylindrical inner cutter 6 forms a surface contact shape along almost the entire inner circumference of the mesh outer cutter 2 having a semicircular cross section. Since the outer cutter 2 rotates in sliding contact with the outer cutter 2, it is possible to effectively prevent local concave deformation of the outer cutter 2 due to skin pressure.
There is no possibility of being scratched by the cutting edge of the inner blade. Further, according to the mesh-like inner blade 6 having a large number of hair introduction holes 14, the cutting edge is formed at each hair introduction hole 1.
4, it eliminates the troublesome assembly process of fixing a large number of inner cutters to a rotating cylinder, as in the conventional inner cutter structure described above. Furthermore, since the hair enters the inner space of the cylindrical inner cutter 6 through the hair introduction hole 14, the blowing out of the hair from the hair introduction hole of the outer cutter can be reduced as much as possible.

Further, in order to achieve the second object of the present invention, the hair introduction holes 14 are arranged in parallel in the axial direction, and a lead angle β is formed between the rows of the hair introduction holes 14. Therefore, compared to, for example, one in which the hair introduction holes are arranged parallel to the axial direction, there is much less chatter on the inner surface of the mesh outer cutter 2, and the blade rotates in sliding contact with the inner surface of the mesh outer cutter 2 quietly, and the cutting quality is also good. .

Furthermore, in order to achieve the third object mentioned above, the present invention has the butt-welded edges 13b and 13b of the inner cutter 6.
A seam 15 formed in between was formed parallel to the 14 rows of hair introduction holes having the lead angle β. According to this, the butt welding edge 13b is obtained by cutting a portion of the inner blade blank 13 between the 14 rows of hair introduction holes and the 14 rows of hair introduction holes in parallel to the 14 rows of hair introduction holes, This cutting direction is parallel to the rows of hair introduction holes 14 and does not cross any of the hair introduction holes 14, so that no edges are generated, such as when the cutting line crosses the hair introduction holes 14. Therefore, the edge 13
b and 13b can be brought into abutment flush with each other without any difference in level, and rotate smoothly in sliding contact with the inner surface of the mesh-like outer cutter 2, and the scratching problem caused by the inner cutter 6 of the outer cutter 2 is also eliminated.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

Figure 1 shows an example of the head part of a rotary electric shaver.
A mesh outer cutter 2 bent into a semicircular cross section is removably mounted with an outer cutter holder 3, and a cylindrical mesh inner cutter 6 fitted on the outer periphery of the cage-shaped rotary body 4 is attached to the outer cutter holder 3. It is equipped so that it can slide and rotate against the inner surface of the blade 2. A gear 8 is fixed to one end of the shaft 7 of this squirrel cage rotating body 4, and a drive gear 11 on the shaft 10 of a motor 9 built in the main body case 1 is transmitted to the gear 8 via a reduction gear 12. The inner cutter 6 is driven to rotate around a shaft 7.

FIG. 3 shows an example of manufacturing the inner cutter 6. First, a thin strip-shaped inner blade blank 13 is formed by electroforming or press processing.
The hair introduction holes 14 are arranged in parallel in the board width direction, these 14 rows of hair introduction holes are inclined at a constant angle θ with respect to the board longitudinal direction, and these 14 rows of hair introduction holes are arranged at a constant pitch P in the board longitudinal direction. establish. The continuous rib 16 between the hair introduction holes 14 has a dish-shaped cross section and has a counter sink 16a. Next, the inner blade blank 13 is cut to a specified size. In this cutting to size, the inner blade blank 1
3, a cutting line _C2 is inserted between adjacent 14 rows of bristle introduction holes parallel to the 14 rows of bristle introduction holes to obtain a diamond-shaped inner blade blank 13a. Next, the diamond-shaped inner blade blank 1
3a is rounded so that the countersink 16a of the continuous rib 16 faces outward, and the edges 13b are butt-seam welded to form a cylindrical inner cutter 6.

In this case, as shown in FIG.
is attached, and the butt welded edge 13b.
A seam 15 parallel to the 14 rows of hair introduction holes is formed between 13b. This seam 15 is the butt weld edge 13
b and 13b are the same circumferential surface, and there is no difference in level. Therefore, after inserting and fitting the inner cutter 6 onto the circumferential surface of the rotary cage 4 so that the joint 15 portion of the inner cutter 6 is positioned on the reinforcing bar 4a of the cage-type rotor 4, Even if this is rotated while sliding in contact with the inner surface of the mesh-like outer cutter 2, the outer cutter 2 will not be scratched at the joint 15 portion of the inner cutter 6. This is, for example, the fixed size cutting line
When C ₁ is inserted perpendicularly to the longitudinal direction of the plate as shown _{by the} imaginary line in FIG. An edge is formed in the hole 14, and this edge tends to cause unevenness when the edges 13b are brought into contact with each other, resulting in a scratching problem of the outer cutter 2.

Furthermore, since the 14 rows of hair introduction holes are provided with a lead angle β, this rotation is quiet and the cutting quality is improved. Since the hair is collected in the cage-shaped rotating body 4 from the hair introduction hole 14 of the inner cutter 6, it does not blow out from the hair introduction hole of the outer cutter 2.

[Effect of idea]

As explained above, the inner blade of the rotary electric shaver according to the present invention is formed into a mesh-like cylindrical shape having a large number of hair introduction holes 14. Therefore, a part of the circumferential surface of the inner cutter 6 slides and rotates along almost the entire circumference of the inner surface of the outer cutter 2, which has a semicircular cross section, so that the outer cutter 2 is rotated in surface contact with the inner surface of the outer cutter 2 due to skin pressure. This is advantageous in that it is possible to eliminate local concave deformation and the problem of scratching of the outer cutter 2 by the inner cutter 6 due to the concave deformation. In addition, such a cylindrical inner blade 6 can be easily constructed by rolling up the inner blade blank 13a having a large number of hair introduction holes 14, and the hair waste can be removed from the hair introduction holes 14 through the cylindrical inner blade 6. Since it enters the internal space, blowing out from the outer cutter 2 can be well prevented.

Furthermore, since the 14 rows of hair introduction holes are given a lead angle β and the seam 15 is formed parallel to the 14 rows of hair introduction holes, the problem of crossing the hair introduction holes 14 at the sizing cutting line C ₂ can be solved. This inner cutter 6 has the advantage of being able to smoothly rotate in sliding contact with the mesh-like outer cutter 2 without scratching, and also ensuring quiet rotation and good cutting quality.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view illustrating a rotary electric shaver, Fig. 2 is a perspective view of a cylindrical mesh inner blade and a squirrel-cage rotating body, and Fig. 3 is an inner blade blank having a large number of hair introduction holes. FIG. 6... Inner blade, 13a... Inner blade blank, 14... Hair introduction hole, 15... Seam.

Claims (1)

[Claims for Utility Model Registration] A rectangular mesh inner blade base plate 13a having a large number of hair introduction holes 14 is wound, and its edges 13b, 13b are wound.
The hair introduction holes 14 are arranged in parallel in the axial direction and a lead angle β is provided in the rows of the hair introduction holes 14. Butt weld edge 13
The seam 15 formed between b and 13b is the hair introduction hole 1
A cylindrical mesh inner blade of a rotary electric shaver characterized by being formed in four parallel rows.