JP3190798B2 - Rotary electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric shaver in which a cylindrical inner blade is slid and rotated in a predetermined direction to shave the inner surface of an outer blade stretched in an arch shape. It also relates to hair that has been easily shaved.

[0002]

2. Description of the Related Art Among electric razors, a reciprocating type in which an inner blade linearly reciprocates and slides on the inner surface of an outer blade with a constant stroke is disclosed in, for example, Japanese Utility Model Laid-Open No. 58-14367. It is known to provide a long hole in the outer blade so that long hair, which has been left unshaved, can be easily shaved.

[0003]

The problem to be solved here is when the outer blade of the rotary electric shaver is provided with a long hole for introducing long hairs as in the case of the outer blade of the reciprocating electric shaver described above. The position of the long hole is provided on the outer blade.

In a rotary electric shaver, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 2-131792, a thin outer blade receives a sliding contact force of the inner blade when the cylindrical inner blade rotates. The blade is pulled downward in the blade rotation direction and displaced in this direction. In order to avoid such displacement of the outer blade, when the long hole is provided in the sliding contact area with the inner blade of the outer blade along with the original short shaving hair introducing hole, the essential short shaving hair introducing hole is provided. This leads to an undesirable situation such as a reduction in the opening area of the sword and a reduction in the efficiency of the original short shaving.

Accordingly, the present invention provides a rotary type in which a cylindrical rotary inner blade is slid and rotated in a fixed direction around an axis to shave the inner surface of the outer blade stretched in an arch shape as described above. In an electric razor, pay attention to the fact that even if the outer blade is displaced by the sliding contact force of the inner blade, the direction of this displacement coincides with the direction in which the outer blade enters the sliding region with the inner blade at the starting point of the sliding contact. By providing a long hole for introducing long hair at the sliding contact start portion, it is possible to reliably introduce and cut long hair without lowering the shaving efficiency of the normal length at the main part of the outer blade. Aim.

[0006]

As shown in FIG. 1, a rotary electric shaver according to the present invention has a large number of hair introduction holes.
A plurality of long holes 15 for introducing long hairs, which are longer than the hair introduction holes 14, are arranged in the shaft 6 direction at a part of the outer blade 10 having the outer blade 10 in sliding contact with the inner blade 3. A hair cutting region A extending from the sliding contact start point S with the inner blade 3 toward the lower side in the inner blade rotation direction, and a bristle introducing region B continuing from the sliding contact start point S toward the inner blade rotating direction toward the upper side. It is characterized by comprising.

[0007]

In the case where the long hole 15 is provided at the start position of the outer blade 10 in sliding contact with the inner blade 3 as described above, the long hair introduced from the bristle introduction region B is rotated in the direction of the hair cutting region A by the rotation of the inner blade 3. And is reliably caught and cut at the end of the hair cutting area A. Therefore, as long as the cutting area A of the long hole 15 slightly covers the sliding contact area W, the long hair cutting can be performed even if the hair introduction area B is not necessarily located in the sliding contact area W. . Therefore, there is no disadvantage that the opening area of the hair introduction hole 14 for short shaving, which occupies the main part of the outer cutter 10, is reduced, and the sliding of the outer cutter 10 with the inner cutter 3 is limited. The contact area W can be used effectively.

The bristle introduction region B of the long hole 15 can be made as long as necessary in the direction of the non-sliding region of the outer cutter 10 with the inner cutter 3, thereby improving the introduction of long hairs.

Even if the outer cutter 10 is displaced in the inner cutter rotational direction lower direction (direction of the sliding contact end side) due to the sliding contact force of the inner cutter 3, the elongated hole 15 moves in the sliding contact direction with the inner cutter 3. The long hairs introduced into this are surely cut because they are displaced in the direction of approach. When the long hole 15 is provided on the side where the sliding contact of the outer cutter 10 with the inner cutter 3 is completed, the outer cutter 10 receives the sliding contact force of the inner cutter 3 to form the long hole 15 in the sliding contact area with the inner cutter 3. Is displaced away from the inner blade 3, so that the introduced long hair remains uncut, but as described above, the long hole 15 provided in the sliding start portion of the outer blade 10 with the inner blade 3 as described above. According to the method, long hairs can be reliably and satisfactorily cut without such a problem.

[0010]

According to the rotary electric shaver, the shaving efficiency of a normal length by the hair introduction hole 14 occupying the main part is also improved by the long hole 15 provided at the portion where the outer cutter 10 starts sliding contact with the inner cutter 3. Long hairs can be reliably shaved without lowering.

[0011]

1 to 5, in the upper part of a main body case 1 of a rotary electric shaver, a cylindrical inner blade 3 having a plurality of spiral blades 2 on its peripheral surface is used to gear a motor 4 to rotate. The outer cutter 10 is supported on the inner cutter support frame 7 so as to rotate around the shaft 6 in the fixed direction P by being received through the transmission mechanism 5, while the outer cutter 10 is provided on the upper part of the main body case 1 from the inner holder 11 a and the outer holder 11 b. The outer cutter holder 11 is curved and stretched in an arch shape so that the upper part of the inner peripheral surface of the inner cutter 3 is involved. One end of the outer blade 10 on the upper side in the inner blade rotation direction P is engaged with a pin 12 provided on the inner holder 11a.
The other end of the outer blade 10 on the lower side of the inner blade rotation direction P is attached to the outer holder 11b by pulling the outer blade 11b with the spring member 13, and the outer holder 11b is put on the outer side of the inner holder 11a. The inner cutter 10 is pulled toward the lower side in the rotation direction P of the inner cutter in response to the sliding contact force with the outer cutter 3, so that the outer cutter 10 is less likely to loosen on the lower side in the rotation direction P. The adhesiveness between the inner blade 10 and the inner blade 3 is improved.

In FIG. 5, the inner blade supporting frame 7 has an elastically deformable arm portion 7a. By supporting and fixing the arm portion 7a to the main body case 1, the inner blade 3 is held while the outer blade 10 receives skin pressure. Both the support frame 7 and the main case 1 are free to float in the vertical direction, and the degree of sliding contact between the outer cutter 10 and the inner cutter 3 is always maintained constant.

As shown in FIGS. 1 and 2, a large number of small polygonal or circular hair introduction holes 14 are provided in a sliding contact area W of the outer cutter 10 provided with the inner cutter 3 as described above. A plurality of long holes 15 for introducing long hairs, which are longer than the hair introduction holes 14, are provided in the sliding contact start portion in such a manner as to be arranged in the axial direction (left-right direction) of the inner blade. In each slot 15, a region extending from the sliding contact start point S of the outer blade 10 to the inner blade 3 toward the lower side in the inner blade rotating direction is a bristle cutting region A, and the bristle cutting region A is closer to the inner blade rotating direction from the sliding contact starting point S. The region toward the side is the hair introduction region B. The cutting region A only needs to slightly extend in the sliding contact region W, and the surplus hair introduction region B does not necessarily need to be located in the sliding contact region W. It can be as long as needed.

By providing the long hole 15 at the portion where the outer cutter 10 starts sliding contact with the inner cutter 3 as described above, the outer cutter 10 receives the sliding contact force of the inner cutter 3 and moves toward the lower side in the rotating direction of the inner cutter. Even if it is displaced, the direction of this displacement coincides with the direction in which the elongated hole 15 enters the sliding contact area with the inner blade 3, so that the long hairs introduced therein are not shaved and left at the end of the hair cutting area A. Can be reliably captured and cut.

As shown in FIG. 6, both the upper and lower ends of the outer blade 10 on the inner blade rotating direction P can be similarly applied to those which are always pulled by the spring member 13.

As shown in FIG. 7, the long hole 15 can be provided so that the size of the long hole 15 is gradually reduced from the side where the outer blade 10 starts sliding to the inner blade 3 toward the side where sliding comes to an end.

The above-mentioned inner blade 3 may be formed such that the blade edge 2 is formed in a straight line parallel to the axis 6, but has a spiral blade edge 2 having a lead angle α as shown in FIG. In some cases, the long axis direction n of the long hole 15 intersects the inner blade rotation direction P, and the cross angle β matches the lead angle α of the cutting edge 2 of the inner blade 3, that is, the long axis direction of the long hole 15. n is the inner blade 3
Perpendicular to the cutting edge 2. Thus, even if the entire outer cutter 10 is pulled so as to be wound in a direction perpendicular to the lead angle α due to the sliding resistance of the cutting edge 2 of the inner cutter 3, this pulling direction and the long axis direction of the long hole 15 become parallel. Because of this slot 1
5 is also easy to cut by introducing long hair.

As described above, the outer cutter 10 is pulled so as to be wound in a direction perpendicular to the lead angle α of the cutting edge 2 of the inner cutter 3.
Therefore, as shown in FIG. 9, the long axis direction n of the long hole 15 is inclined in the same direction as the lead angle α of the cutting edge 2, and the inclination angle is set to be larger than the lead angle α to set the long hole 15 of the outer cutter 10.・ 15
The ribs 16 between them are slanted in the direction opposite to the direction in which the winding force acts. Thus, even if the outer blade 10 is pulled so as to be wound in a direction perpendicular to the lead angle α of the cutting edge 2, the winding force is offset by the sliding contact force of the cutting edge 2 acting on the rib 16 between the elongated holes 15. As a result, the displacement of the outer blade 10 due to the winding force can be reduced, and the introduction and cutting of the long hair into the long hole 15 can be more reliably performed.

As shown in FIG. 4, it is optional to provide the long holes 15 not only on the sliding contact start side of the outer blade 10 but also on the sliding contact end side.

As the pattern of the group of the long holes 15, in addition to the above embodiment, the left half and the right half in the arrangement direction of the long holes 15 are formed obliquely in reverse as shown in FIG.
As shown in FIG. 7, the oblique directions of the long holes 15 can be changed alternately.

As shown in FIG. 12, the shape of the long hole 15 may be a trapezoid whose width gradually decreases toward the lower side in the rotation direction of the inner blade.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part.

FIG. 2 is a perspective view of a main part.

FIG. 3 is a perspective view showing a state where the outer blade is attached to an inner holder.

FIG. 4 is a plan view of the outer cutter.

FIG. 5 is an overall front view showing a part in a cut-out state.

FIG. 6 is a longitudinal sectional view of a main part showing another embodiment.

FIG. 7 is a perspective view of an outer blade showing another embodiment.

FIG. 8 is a front view of an outer blade showing still another embodiment.

FIG. 9 is a front view of an outer blade showing still another embodiment.

FIG. 10 is a front view of an outer blade showing still another embodiment.

FIG. 11 is a front view of an outer blade showing still another embodiment.

FIG. 12 is a front view of an outer blade showing still another embodiment.

[Explanation of symbols]

 3 inner blade 6 axis 10 outer blade 14 hair introduction hole 15 long hole W sliding contact area

Claims (1)

(57) [Claims] 1. A large number of hair introduction holes 1 stretched in an arch shape.
The inner surface of the outer cutter 10 having the cylindrical inner cutter 3
In a rotary electric razor that slidably rotates in a fixed direction around the shave and shaves in the slidable contact area, the hair introduction hole 1 is formed at a part where the outer cutter 10 starts sliding contact with the inner cutter 3.
A plurality of long holes 15 for introducing long hairs longer than 4 are provided side by side in the direction of the shaft 6, and each of the long holes 15 is cut from the starting point S of sliding contact with the inner blade 3 toward the lower side in the rotation direction of the inner blade. Region A;
A rotary electric shaver comprising a bristle introduction region B continuously extending from the sliding contact start point S toward the upper side in the rotation direction of the inner blade.