JPH0252689A - Rotary system electric razor - Google Patents

Abstract

PURPOSE:To improve the cuttability at a center side by executing an arrangement so as to cause the number of sheets of internal blades in the vicinity of a rotation center to be larger than the number of sheets at an outer circumference side in the internal blade block structure of a rotary system electric razor. CONSTITUTION:Two kinds of blades of a long internal blade 1 from the rotation center of the razor main body approximately up to an external blade outer circumference and a short internal blade 2 from the rotation center up to the intermediate position of the external blade outer circumference are alternately mounted to plural sheets of internal blade supporting appliances 3. In such a constitution, since the number of sheets of internal blades are made larger in the vicinity of the center in comparison with the outer circumference side and the cutting interval of beards introduced from the external blade is made short, the cutting resistance and cutting quantity of the beard per each internal blade are reduced. Thus, a difference between the cuttabilities at the central side and outer circumference side can be solved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inner cutter block structure of a rotary electric shaver.

[Summary of the invention]

The present invention relates to an inner cutter block (BI construction) of a rotary electric shaver, and provides a rotary electric shaver that has improved sharpness near the center of the outer blade.

[Conventional technology]

In a conventional rotary electric shaver, the inner blade is approximately radial from the center of rotation of the inner blade support toward the outer periphery, and is composed of a plurality of identically shaped inner blades. It is generally known that it is freely and elastically fitted.

[Problem to be solved by the invention]

In the conventional technology mentioned above, it is generally known that there is a large difference in circumferential speed between the center side and the outer circumferential side of the cutting edge of the inner cutter, and the faster the cutting speed of the whiskers, the better the sharpness. Good. Although there is a lot of sinkage introduced from the outer cutter on the center side, the circumferential speed is low, which has the disadvantage of promoting poor cutting quality.

SUMMARY OF THE INVENTION Therefore, the present invention provides an inner cutter block that overcomes the drawbacks of the prior art.

[Means to solve the problem]

The inner cutter block structure of the rotary electric shaver of the present invention is characterized in that the number of inner cutters near the center is greater than on the outer periphery in order to improve sharpness near the center.

[Effect]

According to the above configuration of the present invention, since the number of inner blades is larger near the center than on the outer circumference side, the cutting interval of whiskers introduced from the outer blade (the time interval during which each inner blade passes the same location on the outer blade) can be shortened. As a result, the amount of hair cut per each inner blade can be reduced. Therefore, the cutting resistance of each inner blade near the center is reduced, resulting in higher cutting ability and improved sharpness.

〔Example〕

The present invention will be explained below based on examples. FIG. 1 is a sectional view of a main part, FIG. 2 is a plan view of the inner cutter block, and FIG. 3 is a back plan view of the inner cutter block. In each figure, 1 is a long inner cutter and 2 is a short inner cutter, each of which is inserted into a through hole 5 of an inner cutter support 3 and is elastically locked by an inner cutter spring 6. Each inner cutter is pushed up by an inner cutter spring 6 and is in close contact with the outer cutter 4. As shown in the figure, the inner cutter support 3 is provided with three long inner cutters 1 and three short inner cutters 2, each having different distances from the center of rotation 0. Of the locus of the rotation of the long inner cutter 1, the locus of the outer circumference 12 is circle A, the locus of the inner circumference 10 is circle A', and similarly, the locus of the outer circumference 11 and inner circumference 9 of the short inner cutter 2 is circle B and circle, respectively. It is B'. The inner diameter of the outer cutter 4 is a circle C.

When the inner cutter rotates, the inner cutter rotates toward the outer circumference due to centrifugal force, and the closer to the center of the inner cutter the contact pressure with the outer cutter 4 increases.
The wear of the sliding surfaces also increases. Therefore, the inner circumference 9 of the short inner cutter 2
is arranged slightly toward the center of the inner periphery 10 of the long inner cutter 1 to disperse the wear surface of the outer cutter 4 and to reduce the progress of wear.

Yen B is 60% of yen C, and yen A is 90% of yen C. Six inner cutters slide on the outer cutter 4 between circle A' on the approximate center side and 83, and three inner cutters slide on the outer cutter 4 between circle B and circle A on the outer circumferential side.

It is generally known that the cutting ability of whiskers is related to cutting resistance. When the angular velocity of the inner cutter is constant, the circumferential velocity on the rotation center side is small and the circumferential velocity on the outer circumference side is large. It is known that cutting force decreases with increasing cutting speed. From this, the cutting ability is high on the outer peripheral side where the circumferential speed is high, and the cutting ability is low on the central side where the peripheral speed is low.

However, since the number of inner blades on the substantially center side is twice that on the outer circumferential side, the amount of cutting per inner blade can be reduced. Since it is known that cutting resistance decreases as the amount of cutting decreases, the cutting resistance can be reduced in this case, thereby improving the cutting ability on the center side and reducing the difference in cutting ability between the center side and the outer circumferential side. can.

〔Effect of the invention〕

As described above, according to the present invention, the cutting ability on the center side can be improved, and a rotary electric shaver with good sharpness can be provided.

2...Short inner blade 3...Inner blade support 4...Outer blade 5...Through hole 6...Inner blade spring 7...Case 8...Motor that's all Applicant: Seiko Epson Corporation Agent: Patent attorney Kisanbe Suzuki and 1 other person

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIGS. 2 and 3 are a top plan view and a back plan view of an inner cutter block according to the present invention, respectively. 1... Nagauchi blade

Claims (1)

[Claims] In an inner cutter block that elastically supports a plurality of two types of inner cutters having different lengths approximately radially from the center of rotation on an inner cutter support rotated by a motor, the inner cutter block elastically supports the inner cutters that are rotated by a motor. A long inner cutter extending from the center to approximately the outer circumference of the outer cutter,
A rotary electric shaver characterized in that two types of short inner blades extending from approximately the center of rotation to approximately the middle of the outer periphery of the outer blades are arranged alternately.