JPH0739657A - Reciprocating type electric razor - Google Patents

Abstract

PURPOSE:To provide a reciprocating type electric razor which can miniaturize the whole shape without being accompanied with an increase of vibration. CONSTITUTION:This electric razor is provided with an oscillation arm 4 having an inner blade attaching part 4b, a cam receiving part 4c for converting an eccentric motion of an eccentric cam 9 into a reciprocating motion, and an oscillation supporting point hole 4a, in one end, the other end, and about a center position, respectively, and a motor 8 constituted by attaching the eccentric cam 9 to a rotary shaft 8a and forming the rotary shaft 8a so as to be protruded to the opposite side to an inner blade 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating electric shaver for cutting a beard and the like, and more particularly to a reciprocating electric shaver using a swing arm.

[0002]

2. Description of the Related Art A reciprocating electric shaver of this type is disclosed, for example, in Japanese Utility Model Laid-Open No. 52-159791, in which a motor 8 having an eccentric cam 9 mounted on a rotary shaft 8a and an outer blade at one end thereof is used. An inner blade 7 slidably contacting with 2 is attached, a cam receiving portion 4c for converting the eccentric movement of the eccentric cam 9 into a reciprocating movement is provided at the other end, and a swing arm 4 having a swing fulcrum portion at a substantially central position is provided. (Fig. 6). This is because the eccentric cam 9 moves eccentrically with the rotation of the rotating shaft 8a.
The displacement of the component substantially orthogonal to 8a is converted into the amplitude of the swing arm 4 by the cam receiving portion 4c. Swing arm
When 4 reciprocally rocks around the rocking fulcrum, the inner blade 7 attached to one end of the rocking arm 4 slides back and forth with respect to the outer blade 2.

Further, in most conventional reciprocating electric razors, as shown in FIG. 7, the distance between the swing fulcrum portion and the inner blade 7 is set.
Let L1 be the distance between the swing fulcrum part and the cam receiving part 4c,
It is designed so that L1 ≒ L2. The reason for this is as follows. Assuming that the force applied to the inner blade 7 is P1 and the force applied to the cam receiving portion 4c is P2, P1 × L1≈P2 × L2 and a balanced state is achieved. Here, if L1> L2, then P1 <P2, so a motor 8 with a large rotational force of the rotary shaft 8a is required,
When the rotational force of the rotary shaft 8a increases, the force applied to the cam receiving portion 4c also increases. Also, if L1 <L2, then P1> P2, so an eccentric cam 9 with a large eccentric amount and a cam receiving portion 4c that increases the amplitude amount are required. Using this eccentric cam 9 and cam receiving portion 4c increases vibration. Cause of. Therefore,
Most conventional reciprocating electric razors are designed so that L1 ≈ L2.

[0004]

In the reciprocating electric shaver using the conventional swing arm described above, in order for the inner blade 7 to slide sufficiently back and forth with respect to the outer blade 2, the swing arm 4 is required. It was necessary to lengthen it to obtain a predetermined amplitude, and the overall shape of the reciprocating electric razor became large. If the swing arm 4 is shortened to reduce the overall shape, the inner blade
In order for 7 to slide reciprocally with respect to outer cutter 2, the distance L1 between the swing fulcrum and inner cutter 7 should be set to the swing fulcrum and cam receiver 4c.
The eccentric cam 9 having a large eccentric amount and the cam receiving portion 4c having a large amplitude amount must be used as well as the distance L2 is larger than the distance L2, which causes increase in vibration as described above.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reciprocating electric shaver which can be downsized in its entire shape without increasing vibration. .

[0006]

In order to achieve the above object, a reciprocating electric shaver according to claim 1 has a rotary drive device having an eccentric cam attached to a rotary shaft, and an inner blade slidably contacting an outer blade at one end thereof. A rotary drive device comprising: a blade attached to the other end of the eccentric cam, which has a cam receiving portion for converting the eccentric movement of the eccentric cam into a reciprocating movement; The rotary shaft is arranged so as to project to the side opposite to the inner blade.

The reciprocating electric shaver according to a second aspect of the present invention is configured such that the swing arm of the first aspect has an opening portion that surrounds the periphery of the rotary drive device.

[0008]

According to the structure of the first aspect, the rotary drive unit is accommodated within the range of the length of the swing arm, and the swing fulcrum portion is located at a substantially central position of the swing arm.

According to the second aspect of the invention, since the swing arm is formed so as to surround the periphery of the rotary drive device, the rigidity is better than that of the rod-shaped swing arm.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

Reference numeral 1 denotes an outer blade frame formed in a cylindrical shape, and the outer blade 2 is attached to one end surface so that the outer blade 2 projects from the one end surface.
I am attached. The outer blade 2 is curved in the longitudinal direction and the lateral direction, and has a large number of hair introduction holes. Reference numeral 3 is a main body housing, and the outer cutter frame 1 is locked at one end so that the outer cutter frame 1 can be attached and detached.

Reference numeral 4 denotes a swing arm, which is a swing fulcrum hole 4a formed at a substantially central position and an inner blade attachment portion 4b formed at one end.
And a cam receiving portion 4c formed at the tip of the other end of which has a substantially L-shaped cross section. Swing fulcrum hole
4a is a swing pin 5 fixed to the housing 3 so that the swing arm 4 can swing about the swing fulcrum hole 4a.
Has been inserted. The inner blade attachment part 4b is attached to the main body housing 3
The inner blade 7 is attached via a coil spring 6. The inner blade 7 comes into sliding contact with the outer blade 2 by being pressed against the outer blade 2 by the coil spring 6 in a state where the outer blade frame 1 is mounted on the main body housing 3. The cam receiving portion 4c is formed so as to convert the displacement of a component of the eccentric movement of the eccentric cam 9 described later, which is substantially orthogonal to the rotating shaft 8a, to the amplitude of the swing arm 4.

Reference numeral 8 denotes a motor, which has a rotary shaft 8a arranged so as to project to the side opposite to the inner blade 7, and is operated by a switch (not shown) so that a power source (not shown) Power is supplied to drive.

Reference numeral 9 denotes an eccentric cam that performs eccentric movement, and has an eccentric cam body 9a that is formed into a substantially cylindrical shape and press-fits into the rotating shaft 8a
The eccentric cam body 9a is composed of an eccentric pin 9b press-fitted at a position displaced from the center, and a drive force transmitting member 9c for transmitting a drive force to the cam receiving portion 4c and press-fitted to the eccentric pin 9b. There is. The driving force transmitting member 9c is formed in a curved shape, that is, in a shape such that a spherical body is crushed, so that the side surface of the driving force transmitting member 9c abuts the cam receiving portion 4c smoothly.

The operation of this embodiment will be described below.
When the power of the power source is supplied to the motor 8 by the switch operation, the rotary shaft 8a performs a rotary motion and the eccentric cam 9 also performs an eccentric motion, and the driving force transmission member 9c makes an eccentric motion while contacting the inner surface of the cam receiving part 4c. To do. At this time, the swing arm
Since the cam receiving portion 4c receives a component of the eccentric movement that is substantially orthogonal to the rotary shaft 8a and reciprocally swings around the swing fulcrum hole 4a, the inner blade 7 reciprocates with respect to the outer blade 2. Perform sliding. Then, when the outer blade 2 is brought into contact with the human body to introduce hair into the hair introduction hole, the hair is cut by the outer blade 2 and the inner blade 7. When the operation is stopped, the operation can be stopped by operating the switch.

Although the eccentric cam 9 of this embodiment is constituted by the eccentric cam body 9a, the eccentric pin 9b and the driving force transmitting portion 9c, the eccentric cam of the present invention is not limited to this and various eccentric cams can be used. Design change is possible.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. It should be noted that members having substantially the same functions as those of the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

The swinging arm 4 of this embodiment is formed in a shape in which a rod-shaped object is vertically added to the central position of one side surface of a substantially square-shaped square tube. The substantially square-shaped rectangular tube has an opening 4d formed to have a size that surrounds the periphery of the motor 8. Then, the inner blade attachment portion 4b at the tip of this rod-shaped object,
A rocking fulcrum hole at the approximate center position on the rod-side piece of the square bracket.
4a is a cam receiving portion 4c with a concave shape at a substantially central position on the opposite piece.
Are formed respectively.

The motor 8 is housed in the opening 4d so as to be surrounded by the substantially square-shaped rectangular tube of the swing arm 4, and is also arranged in the main body housing 3.

The operation of this embodiment is substantially the same as that of the first embodiment. Further, since the swing arm 4 of this embodiment is formed in a substantially square-shaped square tube shape, it has better rigidity than that of the first embodiment.

Although the swing arm 4 of the present embodiment has the opening 4d formed into a substantially square tube shape, the swing arm of the present invention is not limited to this. The part may have a cylindrical shape or a polygonal tubular shape, and various design changes are possible.

[0022]

The reciprocating electric shaver according to claim 1 is
Since the rotary drive unit fits within the length of the swing arm and the swing fulcrum is located at the approximate center position of the swing arm, as a result, the reciprocating electric shaver can be used without forming the swing arm short. The overall shape of can be made small and vibration can be reduced.

In addition to the effect of the first aspect, the reciprocating electric shaver according to the second aspect is formed so that the swing arm surrounds the periphery of the rotary drive device, and therefore has better rigidity than the rod-shaped swing arm. can do.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a first embodiment of the present invention.

FIG. 2 is a perspective view of relevant parts showing an inner blade and a swing arm.

FIG. 3 is a main part perspective view showing the motor and an eccentric cam.

FIG. 4 is a cross-sectional view of essential parts of a second embodiment of the present invention.

FIG. 5 is a perspective view of a main part showing the inner blade and the swing arm.

FIG. 6 is a partial cross-sectional view of a conventional example.

FIG. 7 is a cross-sectional view of a main part of another conventional example.

[Explanation of symbols]

 2 Outer blade 4 Swing arm 4c Cam receiving part 4d Opening 7 Inner blade 8 Motor 8a Rotating shaft 9 Eccentric cam

Claims (2)

[Claims] 1. A rotary drive device having an eccentric cam attached to a rotary shaft, and a cam receiving portion having one end attached with an inner blade slidably contacting an outer blade and converting the eccentric movement of the eccentric cam into a reciprocating movement at the other end. A reciprocating electric shaver having a swinging arm having a swinging fulcrum portion at a substantially central position, in which a reciprocating drive device is arranged such that the rotation shaft is arranged to project to the side opposite to the inner blade. Type electric razor. 2. The reciprocating electric shaver according to claim 1, wherein the swing arm is formed with an opening that surrounds the periphery of the rotation drive device.