JPH0221280B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to an outer blade of a rotary electric razor, and more specifically to an outer blade pattern of a rotary blade, which has a blade hole with a good cutting edge and a good cutting edge. The present invention relates to an outer blade of a rotary electric razor having an outer blade pattern configuration in which blade holes are efficiently arranged to enable shorter shaving.

(Background Art) Conventionally, there are outer blade patterns of rotary electric razors as shown in FIGS. 1 and 2.
In other words, the outer blade pattern shown in Fig. 1 has only hexagonal holes, so it is excellent in the ability to shave shorter, but the cutting resistance is large when shaving roughly the introduced beard. In addition, since the beard cannot be held securely, the cutting quality is disadvantageous when cutting long beards.

In addition, since the outer blade pattern shown in Figure 2 has only square holes, the cutting resistance is low when cutting hair during rough shaving, and the hair is held securely, resulting in a sharp cut. On the other hand, when shaving the final shave, the ability to pull the beard into the blade hole is inferior to that of a hexagonal hole, so it is not sufficient for a shorter shave.

(Object of the Invention) The present invention has been proposed in view of the above points, and its object is to provide an outer blade pattern for a rotary electric razor in which cutting is performed in the circumferential direction from a hexagonal hole. A blade hole that transforms into a square hole (hereinafter referred to as a substantially square hole) with the length of the cutting edge line in the radial direction longer than the blade line, and the blade holes are arranged on approximately the same circumference. To provide an outer blade of a rotary electric razor that introduces beard efficiently and allows a short shave.

(Structure of the Invention) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 shows an embodiment of a rotary electric razor having an outer cutter 1 according to the present invention, and a motor 2.
A cylindrical outer cutter frame 4 is provided above the housing 3 in which the outer cutter 1 is installed. Further, a joint 5 is provided on the motor shaft, and an inner cutter frame 7 that holds an inner cutter 6 is provided at the tip of this joint 5, and the rotation of the motor 2 is transmitted to the inner cutter frame 7 via the joint 5. , the inner cutter 6 is configured to come into sliding contact with the inner surface of the outer cutter 1.

As shown in Fig. 4A, the cutting edge line in the radial direction, which contributes to cutting from the hexagonal hole in cooperation with the inner cutter, is made longer than the cutting edge line in the circumferential direction. A roughly square hole with a blade hole that changes approximately in the circumferential direction,
These are arranged on substantially the same circumference. FIG. 4B shows another example of an outer cutter pattern in which the shape of the cutter hole is different.

Next, the operation of the present invention will be explained.

First, one feature of the present invention is that the blade holes that change from hexagonal holes to substantially square holes are arranged on substantially the same circumference. By the way, a hexagonal hole is a blade hole suitable for finishing shaving, but is not suitable for rough shaving. The reason is that, as shown in Fig. 5A, the hexagonal hole 1a
Considering the condition in which the whiskers 8 are inserted into the blade hole, the result will be as shown in Figure 6B. However, compared to the case of the substantially square hole 1b shown in Figure 6A, the blade hole diameter D ( The distances C ₁ and C ₂ between the beard 8 and the edge of the blade hole become large. δ) shown in is larger for the hexagonal hole 1a. That is, in FIG.
This is the position after the solid line appears. In addition, the tension in the skin 9 around the beard 8 is also greater with the hexagonal hole, and research into the mechanism of shaving has shown that the final shave at the end of the shaving process is performed with a short, open beard as shown in Figure 6 (b). 8 is a state in which the inner blade 6 begins to collide with the beard 8 (indicated by a broken line) to a state in which cutting is completed (indicated by a dashed line), and the beard 8 is cut by the inner blade alone without moving to the edge of the outer cutter 1. It was found that the probability of This means that the greater the tension of the skin 9 around the beard 8, the easier it is to cut the beard 8, which in turn makes it possible to shave shorter.This is the advantage of the hexagonal hole 1a. It is.

On the other hand, there is a drawback when shaving roughly, and when shaving a long beard 8 as shown in the research on the shaving mechanism shown above, the support of the beard 8 by the skin 9 is such that the pressing force of the skin is large in order to shave shorter in the final stage. However, since it is small during rough shaving, it is not as large as during finishing shaving, and the beard 8 easily moves to the edge of the outer cutter, forming a nipping mechanism between it and the inner cutter 6. However, compared to the case of a substantially square cutter hole shown in FIG.
(b) The retention of the whiskers 8 is not certain. In addition, the length of the side of the outer cutter 1 that determines the pinching angle θ between the inner and outer cutters to reduce the cutting resistance is small, and the area that satisfies the optimum pinching angle becomes small. Therefore, it can be seen from the above that the hexagonal hole 1a is disadvantageous for rough shaving.

On the other hand, the characteristics of the substantially square hole 1b are opposite to those of the hexagonal hole 1a. That is, the advantages are that the optimum area of the included angle is large, and that the place where the beard 8 is held is at an acute angle, making it reliable, making it suitable for rough shaving.

The drawbacks are the C ₁ inside the cut hole, which I mentioned earlier.
Since C ₂ is smaller than the hexagonal hole 1a (see Fig. 5B), the tension of the skin 9 around the beard 8 is small,
The amount of hair 8 to be squeezed out is small and the cutting performance (cutting resistance, etc.) is poor, making it unsuitable for final shaving.

From the above, two of the hexagonal hole 1a and the substantially square hole 1b
The important point is how to configure the various types of blade hole arrangement, taking into consideration the usage situation of the user.

However, when we investigate the actual state of users' shaving, there are mainly two types, as shown in FIG. In other words, since it is a rotary type, the razor head is rotated and the skin surface is moved for shaving, but the shape of the razor body, such as the size of the head angle, has its own characteristics.
In some cases, the frequency is high around the center of the head of type A in the diagram, and in other cases, eccentric locations of type B are used frequently.

After understanding this fact, in the present invention, the cutting hole is changed from a hexagonal hole to a substantially square hole on approximately the same circumference, so the user can select the hexagonal hole suitable for finishing regardless of whether type A or B is used. Both the square hole 1a and the substantially square hole 1b suitable for rough shaving can be used, making it easy to introduce hair without variations from person to person, and also making it possible to perform a sufficient finishing shave. .

Further, the present invention is characterized in that the hexagonal hole 1a is gradually changed from the substantially square hole 1b. This feature is because there is no place where the shape of the cutter hole changes suddenly in the entire pattern area, so it is easy to achieve spherical accuracy during plastic processing to reduce the outer cutter 1 to a spherical surface, and the inner and outer cutters are in close contact when sliding. It has good sharpness and sharpness.

Furthermore, in the present invention, the area where the hexagonal hole 1a is changed to the substantially square hole 1b is divided into sections. This feature is that it is possible to easily introduce the beard 8 and shave short without being affected by the previously mentioned variation in the frequency of use of the razor head area during shaving by the user. Especially for users who use the B type shown in Figure 7, increasing the number of sections in the circumferential direction of the change area from hexagonal holes to approximately square holes makes it easier to use the shaving action of hexagonal and square holes. increases, and the above effects can be achieved.

Further, the present invention is characterized in that the substantially quadrangular hole 1b and the hexagonal hole 1a are arranged on a parabola in the radial direction. This is because, as described above, the substantially square hole 1b generally has a large optimum included angle area, and the hair can be held securely, so that the cutting resistance is smaller than that of the hexagonal hole 1a. On the other hand, the hexagonal hole 1a has a cutting resistance of approximately square hole 1 due to the above-mentioned reasons.
It is larger than b. That is, in the case of the embodiment of the present invention shown in FIG.
The cutting timing is separated by b, and the phenomenon of large and small cutting resistance causes changes in time. Also,
As shown in Figure 4B, by configuring the outer blade pattern, it is possible to cut the whiskers in a mixture of square and hexagonal shapes, which suppresses the variation in cutting resistance over time and always It is possible to maintain stable sharpness.

(Effects of the Invention) As described above, according to the present invention, there is a large number of blade holes for introducing whiskers, a rib forming a cutting edge is provided around the blade hole, and a rotating inner blade is in sliding contact. In the outer blade of a rotary electric razor, the blade hole changes from a hexagonal hole to a substantially square hole in which a radial cutting edge line that cooperates with the inner blade and contributes to cutting is longer than a circumferential cutting edge line. Because the blade holes change in the circumferential direction, and these blade holes are arranged approximately on the same circumference,
It has the effect of allowing a rough or short shave.

In addition, since the hexagonal holes are arranged on approximately the same circumference, in the case of only the conventional square hole shown in Fig. 2,
The presence of ribs on the same circumference causes interference between the inner and outer cutters due to uneven wear of the inner cutter, which increases noise and load. It has the advantage of preventing wear and reducing noise and load.

[Brief explanation of drawings]

1 and 2 are conventional examples, FIG. 3 is a sectional view of the head of a rotary electric razor having an outer cutter according to the present invention, FIG. 4A is an embodiment of the outer cutter according to the present invention, and B is a Other embodiments of the same as above, Figure 5 A, B, and 6
Figures 1 and 7 are explanatory diagrams of the operation of the present invention. 1...outer blade, 1a...hexagonal hole, 1b...approximately square hole.

Claims (1)

[Scope of Claims] 1. An outer rotary electric razor that has a large number of blade holes for introducing whiskers, has ribs forming cutting blades around the blade holes, and has a rotating inner blade in sliding contact. In the blade, the blade hole changes in the substantially circumferential direction from a hexagonal hole to a substantially square hole in which a radial cutting edge line that cooperates with the inner cutter and contributes to cutting is longer than a circumferential cutting edge line. An outer blade of a rotary electric razor, characterized in that the outer blade has blade holes and these blade holes are arranged on substantially the same circumference. 2. The rotary electric razor according to claim 1, wherein the blade hole is gradually changed from a hexagonal hole to a substantially square hole with a radial cutting edge line longer than a circumferential cutting edge line. Outer blade. 3. The outer blade of the rotary electric razor according to claim 1, which has a segmented area that is changed from a hexagonal hole to a substantially rectangular hole with a radial cutting edge line longer than a circumferential cutting edge line. . 4. The rotary electric razor according to claim 1, wherein the hexagonal hole and the substantially square hole whose radial cutting edge line is longer than the circumferential cutting edge line are arranged on a parabola in the radial direction. Outer blade.