JP4777253B2 - Inner blade body of vibration driven razor head - Google Patents

Description

  The present invention relates to an inner blade of a vibration (reciprocating) drive type razor head. The present invention also relates to a vibration-driven razor head provided with such an inner blade and a method for cutting body hair.

  The inner blade body of the vibration-driven razor head is used to cut hair by cooperating with the outer blade body. For this purpose, the inner blade body is caused to perform a relative vibration motion in parallel with the outer blade body, and at that time, the inner blade body is pressed against the outer blade body with a certain pressing force. The outer blade body is formed, for example, as a mesh blade having a plurality of hair introduction holes. Since not only the body hair but also the skin reaches the active range of the inner blade through the body hair introduction hole, there is a possibility that the skin contacts the inner blade and is stimulated or damaged.

  In order to prevent this, Patent Document 1 proposes that the distance between the blade edges adjacent to each other of each pair of inner blades is made narrower than the width of the body hair introduction hole of the mesh blade. Furthermore, a coating layer made of a material having a small coefficient of friction is formed on the surfaces of each pair of inner blades located on opposite sides. When the inner blade comes into contact with body hair or skin in the range of the coating layer, the inner blade slips without exerting a cutting action. On the other hand, when the inner blade comes into contact with the body hair at the portion of the blade edge, the body hair is grasped by the blade edge and cut. In this case, skin irritation and damage are sufficiently prevented by the skin being lifted by the covering layer and not touching the cutting edge due to the small cutting edge spacing.

The electric razor known from US Pat. No. 6,057,088 certainly allows a skin-friendly shave. However, the perfection of shaving is impaired in that the inner blade can be cut only on one side, and therefore the hair is cut off only at a part of the contact between the inner blade and the body hair.
JP-A-10-118358

  The object of the present invention is to produce a shave that is as perfect and gentle to the skin as possible.

This problem is solved by the features of claim 1.
An inner blade body of a vibration-driven razor head according to the present invention has a plurality of blades arranged in pairs, and a first blade edge for cutting body hairs on opposite sides of each pair of blades Is formed. The inner blade body according to the present invention is characterized in that a second blade edge for cutting hair having a cutting action weaker than the first blade edge is formed on the opposite sides of each pair of blades.

  An advantage of the present invention is that a very perfect shaving can be obtained without compromising the shaving comfort. In particular, it has the advantage that both sides of the blade contribute to the shaving action, despite the fact that both sides of the blade are formed differently and accordingly the gentleness to the skin is also different.

  In an advantageous embodiment of the inner blade according to the present invention, the first cutting edge has a first cutting edge angle smaller than the second cutting edge angle of the second cutting edge between the two surfaces forming the first cutting edge. Have. The first cutting edge angle is formed as an acute angle and is preferably about 45 °. The second cutting edge angle is preferably about 90 °. In addition, it is advantageous that at least one of the first cutting edge and the second cutting edge has a cutting edge radius of at most 5 μm. Furthermore, it is advantageous that the cutting edge interval between the first cutting edges adjacent to each other is smaller than the cutting edge interval between the second cutting edges adjacent to each other. Under this condition, the skin swells essentially slightly between the first cutting edges adjacent to each other than between the second cutting edges adjacent to each other. As a result, there is no risk of irritating or damaging the skin with the relatively sharp first cutting edge. In particular, the cutting edge interval between the first cutting edges adjacent to each other is approximately 250 μm, and the cutting edge interval between the second cutting edges adjacent to each other is approximately 800 μm.

  The invention also relates to a vibration-driven razor head equipped with an inner blade according to the invention. The razor head according to the present invention has an outer blade body provided with a plurality of body hair introduction holes, and the maximum size of the body hair introduction hole in a direction parallel to the movement direction of the inner blade body is the blade of the inner blade body. It is at least one of larger than the blade edge | interval between the 1st blade edges adjacent to each other, or smaller than the blade edge | interval between the 2nd blade edges adjacent to each other of the blades of the inner blade body. This also allows some swelling of the skin through the body hair introduction hole of the outer blade body, thus cutting the body hair very close to the skin. At the same time, strong contact between the skin and the cutting edge that results in irritation or damage to the skin is prevented.

  The method of cutting body hairs by vibration relative motion between the inner blade body and the outer blade body according to the present invention is the same in which at least several body hairs have a cutting action larger than that of the second blade edge first by the second blade edge. It is characterized by being cut by the first cutting edge of the inner blade.

  By pre-cutting the body hair with the second cutting edge, the first cutting edges are brought in close proximity to each other, thereby making it possible to employ an inner cutting body that works very gently on the skin. The previously trimmed body hair also enters the very narrow gap between the first cutting edges without problems, where it is cut very close to the skin. With regard to cutting the hair as close as possible to the skin, it is advantageous that the first cutting edge cuts the hair when in contact with the hair and cuts the hair at the cut site.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.
FIG. 1 is a schematic cross-sectional view of some components of an embodiment of an electric razor razor head formed in accordance with the present invention. Here, an inner blade body 1 and a mesh blade (outer blade body) 2 with which the inner blade body 1 is in contact are shown. The cross section selected in this figure extends parallel to the relative movement direction of the inner blade body 1 and the mesh blade 2, and only a partial region is shown here. The inner blade body 1 has a plurality of blades 3 arranged in a regular order. Each blade 3 has a first blade edge 4 and a second blade edge 5 disposed on the side opposite to the first blade edge 4. The geometry of the blade 3 is shown in detail in FIG.

  Each of the first blade edge 4 and the second blade edge 5 is positioned so that the first blade edge 4 and the second blade edge 5 are alternately and continuously positioned two by two in the blades 3 continuously disposed in the inner blade body 1. Oriented. This means that one blade 3 and a blade 3 adjacent to the blade 3 form a pair (a set), and the first blade edge 4 is formed on the side facing each other, and the first blade 4 is formed on the opposite side. Two cutting edges 5 are formed. A cutting edge distance A1 is formed between the first cutting edges 4 adjacent to each other, and a cutting edge distance A1 between them is smaller than a cutting edge distance A2 between the second cutting edges 5 adjacent to each other. Preferably, the cutting edge distance A1 between the first cutting edges 4 is about 250 μm, and the cutting edge distance A2 between the second cutting edges 5 is about 800 μm. The inner blade body 1 is manufactured by a series of various techniques such as an electroforming method, an etching method, a stamping method, a punching method, or a grinding method.

  The mesh blade 2 shown in FIG. 1 has a plurality of body hair introduction holes 7, and includes ribs 6 that surround each body hair introduction hole 7. The maximum lateral dimension A3 of the hair introduction hole 7 in a direction parallel to the movement direction of the inner blade body 1 is particularly larger than the blade edge interval A1 between the first blade edges 4 adjacent to each other in the inner blade body 1, and Or, it is selected so as to be smaller than the blade edge interval A2 between the second blade edges 5 adjacent to each other of the inner blade body 1. The maximum lateral dimension A3 of the body hair introduction hole 7 of the mesh blade 2 is typically about 500 μm. During the shaving process, the inner blade body 1 comes into contact with the rib 6 of the mesh blade 2 at the portions of the blade edges 4 and 5 and vibrates (reciprocates) with respect to the mesh blade 2. The oscillating motion extends in a direction parallel to the mesh blade 2 and is indicated by a double arrow in FIG. The shaving process will be described in detail later with reference to FIGS.

  2 shows an enlarged outer contour of the blade 3 of the inner blade body 1 shown in FIG. The first cutting edge 4 of the blade 3 is formed by two surfaces that form a first cutting edge angle α smaller than 90 °, that is, the first cutting edge angle α is formed as an acute angle. Preferably, the first cutting edge angle α is about 45 °. The second cutting edge 5 of the blade 3 preferably has a second cutting edge angle β of about 90 °. In principle, the second cutting edge angle β can also be varied from an advantageous value. However, in any case, the second cutting edge angle β is larger than the first cutting edge angle α, and therefore the second cutting edge 5 has a weaker cutting action than the first cutting edge 4. The cutting edge radii of the first cutting edge 4 and the second cutting edge 5 are 5 μm or less.

  FIG. 3 shows a schematic sectional view of the instantaneous state during operation of the razor head according to the invention. Here, a peripheral region of one body hair introduction hole 7 of the mesh blade 2 and a pair of blades 3 of the inner blade body 1 moving over this region are shown. In this figure, a part of the skin 8 is shown together with the hair 9 inside the hair introduction hole 7 of the mesh blade 2. The skin 8 is pressed into the mesh blade 2 so that the skin 8 partially protrudes beyond the cutting plane 10 on which the cutting edges 4 and 5 of the blade 3 move. Inflate inside. At the time shown, the blade 3 of the inner blade body 1 moves from right to left in the direction of the arrow, and at this time, the preceding blade 3 just contacts the skin 8 at the second blade edge 5.

  During the continuous movement of the inner blade body 1, the preceding blade 3 moves the skin bulge portion forward by the second blade edge 5 and pushes the skin portion from the body hair introduction hole 7 of the mesh blade 2. At that time, because of the large second cutting edge angle β of the second cutting edge 5, the skin 8 is not damaged or stimulated. Finally, the leading blade 3 is the second cutting edge 5 and abuts against the hair 9 protruding into the hair introduction hole 7 of the mesh blade 2. The preceding blade 3 displaces the body hair 9 to the rib 6 that borders the body hair introduction hole 7 of the mesh blade 2 at the second blade edge 5 without cutting the body hair 9. At that time, the second cutting edge 5 slides somewhat along the hair 9. The hair 9 is cut by the second cutting edge 5 when it collides with the rib 6 of the mesh blade 2. However, the cutting is performed not at the position where the second cutting edge 5 first contacts, but at a position far away from the skin 8 due to the slip at the intermediate point.

  The following blade 3 follows the leading blade 3 at the blade edge interval A1. The subsequent blade 3 moves with the first blade edge 4 in front. Narrow gap between the first blade edge 4 of the preceding blade 3 and the first blade edge 4 of the subsequent blade 3 when the skin 8 is pushed out from the body hair introduction hole 7 of the mesh blade 2 by the second blade edge 5 of the preceding blade 3. The skin 8 is not stimulated or damaged regardless of the small first cutting edge angle α of the first cutting edge 4. During the continuous movement of the inner blade body 1, the subsequent blade 3 is first with respect to the body hair 9, which is upright again immediately after the cutting of the preceding blade 3 by the second cutting edge 5, and is trimmed with the preceding blade 3. It strikes at the cutting edge 4. This state is shown in FIG.

  FIG. 4 shows an instantaneous state different from FIG. 3 during operation of the razor head according to the invention. This instantaneous state corresponds to the time when the first cutting edge 4 of the subsequent blade 3 contacts the body hair 9. At the time of this contact, the first cutting edge 4 of the subsequent blade 3 cuts the body hair 9, whereby the body hair 9 is fixed to the subsequent blade 3. In this process, the first cutting edge 4 of the subsequent blade 3 directly contacts the skin 8, so that the first cutting edge 4 cuts the hair 9 very close to the skin 8. Together with the subsequent blade 3, the hair 9 is carried to the rib 6 of the mesh blade 2, where it is cut by the first cutting edge 4 of the subsequent blade 3 at the first contact point and therefore very close to the skin 8. .

  Therefore, a very short cutting length as compared with the second cutting edge 5 obtained with the first cutting edge 4 is that the first cutting edge 4 cuts the body hair 9 at the first contact of the body hair 9 and therefore does not slide along the body hair 9. Realized. Further, the acute formation of the first cutting edge 4 requires only a small cutting force to cut the body hair 9, and the stress region in the body hair 9 is considerably localized. As a result, the hair 9 already trimmed in advance is effectively trimmed again.

  On the other hand, the cutting process by the second cutting edge 5 requires a large cutting force and causes a large stress region in the body hair 9. This is because, in the hair 9 already cut in advance, the hair 9 sandwiched between the rib 6 of the mesh blade 2 and the second cutting edge 5 of the blade 3 is not cut and jumps from the hair introduction hole 7 of the mesh blade 2. Let it come out. In this case, cutting to a short final length is not performed. However, since the hair 9 that has already been trimmed in advance is surely cut by the first cutting edge 4, the combination of the first cutting edge 4 and the second cutting edge 5 produces a very perfect and gentle shave.

FIG. 3 is a schematic cross-sectional view of several components in an embodiment of an electric razor razor head formed in accordance with the present invention. FIG. 2 is an enlarged view of the outer contour of the blade shown in FIG. 1. Sectional drawing of the instantaneous state during driving | operation of the razor head based on this invention. Fig. 4 is a cross-sectional view of an instantaneous state different from Fig. 3 during operation of a razor head according to the present invention.

Claims (11)

A plurality of blades (3) are provided, and two adjacent blades (3) form a pair of blades (3), and a plurality of adjacent blades (3) are further formed,
In the inner blade body of the vibration-driven razor head in which the first blade edge (4) for cutting the hair (9) is formed on the opposite sides of each pair of blades (3),
A second cutting edge (5) for cutting body hair (9) having a cutting action weaker than that of the first cutting edge (4) is formed on the opposite side of each pair of blades (3). An inner blade body characterized by   The first cutting edge angle (α) between the two surfaces forming the first cutting edge (4) is smaller than the second cutting edge angle (β) of the second cutting edge (5). Item 2. The inner blade body according to Item 1.   The inner cutter according to claim 2, characterized in that the first cutting edge angle (α) is an acute angle, preferably about 45 °.   The inner cutter body according to claim 2 or 3, wherein the second cutting edge angle (β) is about 90 °.   5. Inner blade body according to claim 1, wherein the first cutting edge and / or the second cutting edge have a cutting edge radius of at most 5 μm.   The cutting edge interval (A1) between the first cutting edges (4) adjacent to each other is smaller than the cutting edge interval (A2) between the second cutting edges (5) adjacent to each other. The inner blade body according to any one of 5.   The inner blade body according to any one of claims 1 to 6, wherein a blade edge interval (A1) between the first blade edges (4) adjacent to each other is about 250 µm.   The inner blade body according to any one of claims 1 to 7, wherein a blade edge interval (A2) between the second blade edges (5) adjacent to each other is about 800 µm.   A vibration-driven razor head comprising the inner blade (1) according to any one of claims 1 to 8. An outer blade body (2) having a plurality of body hair introduction holes (7) is further provided, and the maximum dimension of the body hair introduction hole (7) in the direction parallel to the movement direction of the inner blade body (1) is (1) of the first cutting edge (4) adjacent to each other razor head according to claim 9, wherein from size Ikoto edge spacing (A1) between each other. The maximum dimension of the hair introduction hole (7) in the direction parallel to the direction of movement of the inner blade (1) is the distance between the blade edges (2) between the adjacent second blade edges (5) of the inner blade (1). The razor head according to claim 10, which is smaller than A2).

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