KR20070023527A - Inner cutter for a reciprocating type electric shaver - Google Patents

Abstract

A plurality of cutter blades 16 having an arc shape are integrally formed on the side edge 28 of the inner cutter, and the cutter blades are in sliding contact with the inner surface of the outer cutter having an arc shape and reciprocate. An inner cutter is provided, and the ends of two closely arranged cutter blades are connected to each other so that the connecting portion A is coupled to the side portion 28 by the engaging portion 26.

Description

Internal cutter for reciprocating electric shaver {INNER CUTTER FOR A RECIPROCATING TYPE ELECTRIC SHAVER}

1 is a perspective view of a reciprocating electric shaver in accordance with an embodiment of the present invention.

Figure 2 is an enlarged perspective view of the parts close to the two inner cutters constituting the razor.

Figure 3 is an enlarged perspective view of one of the two inner cutters.

Figure 4 is an enlarged view showing the inner cutter shown in FIG.

5 is a perspective view showing an internal cutter according to another embodiment of the present invention.

FIG. 6 is an enlarged view of the inner cutter shown in FIG. 5; FIG.

7A-7D illustrate configurations of cutter blades in accordance with the present invention.

* Symbol description *

10 ....... External Cutter 12 ..... Internal Cutter

16 ...... Cutter Blade 24 ..... Lamination

The present invention relates to an inner cutter for a reciprocating electric shaver, wherein a plurality of cutter blades having an arc shape are integrally formed in the electric shaver, and the cutter blades reciprocate at the same time as the inner surface of the outer cutter of the arc shape. Slip contact

In the reciprocating electric shaver, the inner cutter is in sliding contact with the inner surface of the arc-shaped outer cutter during the reciprocating motion, and cuts the hair (hair) introduced into the opening formed in the inner cutter and the outer cutter. Typically there are two types of internal cutters. As disclosed in Japanese Patent Application Laid-Open No. S62-148684, one type of internal cutter is a prefabricated internal cutter and the other type is an integrated internal cutter.

According to the prefabricated internal cutter, a plurality of semicircular cutter blades are punched from the thin plate, and the semicircular cutter blades are arranged at fixed intervals and supported in a support stand. In the inner cutter, a plurality of cutter blades are prepared separately from each other, and the center and both ends of the cutter blades are attached to and supported by the support member. Therefore, according to the problem of the prefabricated internal cutter, the assembly work is difficult, and productivity is reduced with a plurality of manufacturing steps.

On the other hand, according to the integrated internal cutter, all the cutter blades are integrated. For example, with one type of integrated internal cutter, slits (grooves) are constructed transversely in the tubular base material such that arcuate portions held between the slits form cutter blades. In addition, a thin plate of metal or ceramic is bent in an arc shape and cut along the ridge line to form slits, and parallel arc-shaped cutter blades are formed at fixed intervals.

According to another integrated inner cutter, as disclosed in Japanese Patent Application Laid-Open No. S 62-148684, the inner cutter is formed of a soft material such as plastic, and a coating layer such as chromium is formed on the entire surface of the inner cutter. The sliding surface with the inner surface of the outer cutter is polished.

When the electric shaver is used, noise and vibration are generated by the electric motor and the driving mechanism therein, and blade vibration formed when cutting the hair introduced into the opening of the inner cutter and the outer cutter, and between the outer cutter and the inner cutter. Sounds (such as cutting sounds, shaving sounds, and rubbing sounds) are generated by vibrations due to friction formed in the. Since the outer cutter is in direct contact with the skin, the sound of friction and hair cutting by the outer and inner cutters is sensed by the user. The sounds thus affect the feel of the shaver.

Considering the above problems, for one of the inner cutters, a plurality of projecting strips are formed in a single metal plate, the strips intersect the sliding direction of the inner cutter, and the metal plate is slid to have an arc shape. It is bent in a direction orthogonal to and then the outer peripheral surface is polished to separate the cutter blades (Japanese Patent Application Laid-open No. H 10-323461). In other words, a plurality of cutting grooves are formed by using a grinding wheel or press working in the inner cutter to provide protrusion strips in the metal plate, and the protrusion strips are separated by polishing the outer periphery to form an arc shape. To form a cutter blade and improve the cutting sound during use.

According to the assembled internal cutter disclosed in Japanese Patent Application Laid-open No. H10-323461, since the center of the cutter blade is supported by the internal cutter stand, the cutter blade (as described in paragraph 0022 of the document) The inner cutter plate 15 is not very flexible and hardly generates cutting noise. According to the prior art disclosed in Japanese Patent Application Laid-Open No. H10-323461 (Kokai), in order to improve the workability of the bending work bent in an arc shape and to improve the cutting feeling by improving the external cutter and assembly state, Cuts 71 disclosed in FIG. 9 are provided in the inner periphery of the cutter blade (see paragraph 0082).

However, according to the internal cutter disclosed in Japanese Patent Application Laid-Open No. H10-323461 (Kokai), for example, the thickness of the flat plate used, the height of the protruding strip (the width of the cutter blade in the radial direction), and the protruding strip The natural frequency and vibration characteristics of the cutter blades are determined by the thickness (the thickness of the cutter blades in the direction in which the inner cutter reciprocates). Therefore, it is difficult to provide a suitable acoustical state by changing the above parameters and increasing the cutting noise.

Therefore, it is considered that the cutting blade vibrates easily in the direction in which the inner cutter reciprocates and actively generates good sound. According to the applicant of the present invention, in Japanese Patent Application No. 2004-042658, a vibration control portion for allowing vibration of the cutter blade at a position close to the connection portion connecting both ends of the arc-shaped cutter blade with the side edge portions is constituted. do.

However, when vibration of the cutter blades is actively used according to the above method to improve the acoustic state, stress concentration is generated at the connection between both ends and side edges of the cutter blade and durability is reduced. Thus, a method for solving the above problem-by reducing the length of the cutter blade and making the vibration difficult-is considered, but in this case the acoustic state becomes poor.

The present invention is provided in view of the above facts.

An object of the present invention is to form an integrated internal cutter for a reciprocating electric shaver, to have a good acoustical state in use, to easily form a good usability and target tone, to disperse the stress applied to the cutter blade, and to improve durability. To provide a cutter.

For this purpose, a plurality of cutter blades having an arc shape are integrally formed on the side edge of the inner cutter, and the cutter blades are in sliding contact with the inner surface of the outer cutter having an arc shape and reciprocating. With respect to the internal cutter for, according to the present invention,

The ends of the two cutter blades arranged in close proximity are joined together to form a connecting portion, and the connecting portion is joined to the side portion by the engaging portion.

According to the above configuration, the ends of two cutter blades arranged closely in the inner cutter of the present invention are coupled to each other to form a connecting portion, and the connecting portion is connected to the side portion by the engaging portion. The cutter blades thus vibrate easily and as a result the use sound of the electric shaver is improved, and a good feeling and sound can be obtained. The stress applied to the cutter blade is distributed at both ends of the cutter blades to the connecting portion and the engaging portion to improve the durability of the cutter blade.

According to the invention, it is preferred that the inner cutter is made of a metal plate of a uniform thickness (for example, a thin plate of stainless steel), each cutter blade having a predetermined width in the direction in which the inner cutter reciprocates, at both ends It is coupled to the connection part. The width of the coupling portion connecting the coupling portion to the side portion is slightly larger than the width of the cutter blade. According to the above configuration, the stress of the cutter blade which is strange to the vibration is distributed to the proximal portion of the connecting portion and the proximal portion of the coupling base (near portion of the engaging portion arranged close to the side edge), and the stress is smoothly distributed. The durability of the cutter blade can be reliably increased.

Both ends of the two cutter blades arranged in close proximity are connected to each other and joined to the side portion by the engaging portion. However, at both sides of adjacent cutter blades, the connecting portion can be offset by the pitch of one cutter blade. That is, according to the present invention, the ends (first ends) of each of the adjacent cutter blades are connected to each other, the end of the other cutter blade in proximity to the other end formed in one of the two cutter blades ( Second end) is connected. According to the configuration (both ends of the two cutter blades are connected to each other), two closely arranged cutter blades are united and moved in parallel, so that the stress is increased around the base portion of the engaging portion, With the configuration in which the joints located at both ends of the cutter blade are offset by a pitch, the vibrations of the adjacent cutter blades are not parallel and the vibration is increased around the joint. Since the vibration patterns of the cutter blades are different, the generated sound changes slightly.

It is preferred that the joining portion be provided independently for each connecting portion, and it is preferred to join the connecting portion to the side by one joining portion. According to the above configuration, the shape of the engaging portion is simplified, and the durability and workability of the inner cutter are improved. In addition, adjacent connecting portions may be connected to a single coupling portion and the coupling portion may be connected to the side portion.

1 and 2, each outer cutter 10 has an outer cutter body (10a), the outer cutter body is formed by bending a thin metal plate such as stainless steel in an arc shape, the longitudinal direction of the outer cutter body Both ends arranged in the direction are closed by plug plates. An arc-shaped portion of the outer cutter body 10a has a plurality of openings through which hair is introduced.

Referring to the following description, the inner cutter 12 has a plurality of cutter blades 16 which are integrally formed and have an arc shape. An outer peripheral surface formed in an arc shape on each cutter blade 16 has a curved surface, and the curved surface slides along the inner surface of the outer cutter body 10a of the outer cutter 10. Specifically, the inner cutter 12 shown in FIG. 4 is formed of a thin plate 24, and the thin plate 24 is bent in an arc shape as shown in FIG. An element 18 is fixed to the inner surface of the side portions 28, the side portions 28 arranged in parallel in the longitudinal direction of the inner cutter 12. The support element 18 is fixed on the support stand 14 so that it can pivot and move vertically. Referring to the structure shown, the two outer cutters 10 are arranged in parallel in the support frame 20 of the outer cutter. Thus, two inner cutters 12, two support elements 18 and two support stands 14 are provided to coincide with the outer cutters 10.

Referring to FIG. 2, a vibrating body 22 is provided on top of the razor housing 24 that includes a motor (not shown in the figure). Specifically, two end portions 22a formed on the vibrating body 22 are provided on the razor housing 24, and the moving parts 22b formed at the center of the razor housing 24 are the reciprocating direction of the inner cutter 12. It vibrates with (arrow of FIG. 2). An eccentric pin fixed to a rotating shaft of a motor (not shown in the figure) is connected with the moving part 22b, and the moving parts 22b reciprocate with each other by a phase difference of 180 °. The support stands 14 are fixed to the moving parts 22b, respectively.

The outer cutter 10 is provided in the support frame 20 of the outer cutter so that the outer cutter 10 moves toward or below the razor housing 24, and the support stand 14 is upwardly elastically pressed. The inner cutter 12 is supported by the. Therefore, the inner cutters 12 are in sliding contact with the inner surfaces of the outer cutter bodies 10a and reciprocate.

Next, the internal cutter 12 will be described.

Each inner cutter 12 consists of a thin plate 24 of uniform thickness, as shown in FIG. 4, which is bent in an arc shape and fixed to the support element 18. The thin plate 24 is made of a metal plate such as stainless steel, and is integrated with the plurality of cutter blades 16 by a suitable processing method such as etching, press work, or the like.

The cutter blades 16 are arranged with a constant pitch in the reciprocating direction of the inner cutter 12 (arrow direction or left / right direction of FIG. 3), and the reciprocating direction of the inner cutter 12. It extends in the orthogonal direction.

Referring to FIGS. 3 and 4, both ends of the two cutter blades 16 arranged in close proximity are joined to each other to form a connection A. FIG. The two cutter blades 16 thus form a loop by means of the connecting portion A facing at both ends. The connection portion A is coupled to the side portion 28 by a coupling portion 26 formed between the side portions 28 of the thin plate 24 and the connection portion A, and all the cutter blades 16 These have a coupling structure. The engaging portions 26 located at both ends of the cutter blade 16 are connected to the side portions 28 by engaging bases B. As shown in FIG. Therefore, according to the illustrated embodiment, the connecting portion A and the coupling base portion B are arranged on the same straight line X, and the straight line X is orthogonal to the reciprocating direction of the inner cutter 12. .

The thin plate 24 is bent in an arc shape as shown in FIG. 3, and both side portions 28 are fixed to the support element 18 as described above.

Each cutter blade 16 has a predetermined width and extends to a position proximate to the connecting portion A. The width of the engaging portion 26 is slightly larger than the width of the cutter blade 16. The thin plate 24 has a uniform thickness as a whole, so that when an external force acts on the cutter blade 16 in the reciprocating direction of the inner cutter 12, the external force is first absorbed in the vicinity of the connecting portion A, If the external force is relatively large, the external force is absorbed in the vicinity of the coupling base portion (B). Therefore, external force is dispersed and absorbed in the plurality of positions A and B, stress is not concentrated vigorously, and durability of the cutter blades 16 is increased. The cutter blade 16 can be configured long so that the cutter blades 16 form sufficient vibration to improve the shaving sound.

5 shows a perspective view of the inner cutter 12A according to the invention, and FIG. 6 shows an exploded view.

According to the embodiment of FIG. 5, the connecting portions A and Aa are arranged at both ends of the cutter blade 16 so that the connecting portions A and Aa are accurately pitch (the pitch of the cutter blade 16). offset array by p). That is, the ends (first ends) of two adjacent cutter blades 16a and 16b are connected by the connecting portion A, and the other end formed in one cutter blade 16b of the two cutter blades. (Second end located on the side facing away from the first end) and an end (second end) of another cutter blade 16c arranged in close proximity to the cutter blade 16b are connected by a connecting portion Aa. Thus, the connecting portions A and Aa are offset by the pitch p of the cutter blade 16 in the reciprocating direction of the inner cutter. The corrugated structure is formed continuously for all cutter blades 16.

In the above configuration, the straight line X passing through the coupling base portion B and the coupling portion A of the coupling portion 26 is connected to the coupling base portion Bb and the coupling portion Aa of the coupling portion 26a. It is offset by the pitch p of the cutter blade 16 with respect to the straight line Xa passing through. Thus, when the external force acts on the cutter blades 16 in the reciprocating direction of the inner cutter (along the arrow direction of FIG. 6), the adjacent cutter blades 16 vibrate and vibrate with each other, and FIG. 2 In the case of the inner cutter 12 shown in Figure 4 to form a shaving sound having a slightly different acoustic state.

Referring to FIGS. 5 and 6, the parts corresponding to those shown in FIGS. 2 to 4 have the same reference numerals and will not be described.

Referring to Figures 7A-7D, an arrangement of cutter blades in accordance with the present invention is shown. 7A and 7B have the above structure with respect to FIGS. 3 and 4 and 5 and 6, and FIGS. 7C and 7D have different structures.

Referring to the structure of FIG. 7C, the coupling portion 26b is connected to each other by an intermediate coupling portion C and has adjacent coupling portions A, and the coupling portion 26 is connected to the side portion 28. . According to the structure of FIG. 7D, although the cutter blades 16 have an inclined structure with respect to the reciprocating direction of the inner cutter, the connecting portion A, the engaging portion 26 and the engaging base portion B are essentially FIG. 7A. Same as the corresponding parts of.

Referring to the structure of FIG. 7C, since the intermediate connecting portion C is added, the stress applied to the cutter blade 16 is more reliably distributed, and the inner cutter 12 has the intermediate connecting portion C. It is much more durable compared to the structure without). According to the structure of FIG. 7D, the hair is cut at an angle by the cutter blade 16, and the shaving feeling (cutting feeling) is improved. As shown in Fig. 7B, according to the structures of Figs. 7C and 7D, the connection part A and the coupling base part B arranged at one end of the cutter blade 16, and the other end of the cutter blade 16 are shown. The connecting portion (Aa) and the coupling base portion (Bb) arranged in can be offset by the pitch (p).

Claims (5)

In the inner cutter for a reciprocating electric shaver in which a plurality of cutter blades having an arc shape are integrally formed on the side of the inner cutter, and the cutter blades are in sliding contact with the inner surface of the outer cutter having an arc shape. , Wherein the ends of the two cutter blades arranged in close proximity are joined together to form a connection portion, and the connection portion is coupled to the side portion by the coupling portion. The reciprocating electric shaver according to claim 1, wherein the inner cutter is made of a metal plate having a uniform thickness, the cutter blade has a predetermined width, and the joining portion has a width larger than that of the cutter blade. Internal cutter for. 3. An internal cutter according to claim 1 or 2, wherein both ends of two closely arranged cutter blades are connected to each other. 3. The cutter of claim 1, wherein the first ends of the two cutter blades arranged in close proximity are connected to each other, and the second end of one of the cutter blades is connected to the second end of the other cutter blade. Internal cutter for reciprocating electric surface pottery, characterized in that. The inner cutter of claim 1, wherein the engaging portion independently couples each connecting portion to the side edge portion.

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