JPH0811148B2 - Electric razor reciprocating drive - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reciprocating drive device for an electric razor.

[Prior art]

Conventionally, there is a device that oscillates a thin elastic piece from both sides of a vibrator and reciprocates the vibrator by an eccentric pin attached to a motor shaft. As shown in FIG.
~ 5mm reciprocating motion, thin elastic piece length (L)
However, in consideration of durability, the deflection rate should be about 10% 10
I needed ~ 15mm.

On the other hand, in the specification and drawings of Japanese Utility Model Application Laid-Open No. 56-69361, the vibrating substrate 11 is driven in the reciprocating direction by the eccentric cam of the rotary shaft of the motor, and the vibrating substrate 11 from both outer ends thereof in the horizontal plane direction. There is described a movable blade driving mechanism such as an electric razor having a vibrator having elastic arm pieces 12 and 12 extending to the end and supported by the main body case.

[Problems to be Solved by the Invention]

First, in the conventional example of FIG. 1, the vibrator requires a long base to the body, which is an obstacle to shortening the body. Also, the thin elastic piece of the vibrator easily buckles due to the spring pressure that pushes up the inner blade and the force when attaching and detaching the inner blade, and because the thin elastic piece deforms, the vibrator moves up and down during reciprocating motion. However, there is a defect that the inner blade cannot be pressed uniformly against the outer blade.

In addition, regarding the preceding example described in the specification and drawing of Japanese Utility Model Application Laid-Open No. 56-69361, in general, the vibrating substrate in the vibrator of this form forms the engaging portion with the eccentric cam and the engaging portion with the movable blade. It suffices to have a central portion and a joint portion between the left and right outer end elastic arm pieces, and other portions are basically unnecessary.

However, the vibrating substrate is first formed in a rectangular shape in plan view, and has a functionally useless portion. That is, the corner portion of the vibrating substrate different from the mounting portion corner to which the elastic arm piece is attached is a useless area. Therefore, the entire vibrator becomes heavier by that amount, and the vibration of the electric razor increases during use, which causes discomfort on the face and hands of the user. For this reason, electric razor designers pay close attention to making the vibrator as light as possible.

Moreover, the elastic arm pieces are almost parallel to the left and right side walls of the vibration base,
In addition, it is formed with a slight gap between the left and right sidewalls, but when using an electric razor or due to external disturbance, they collide with each other and damage or abnormal noise is likely to occur. It is necessary to keep it small or to secure a sufficiently large gap between the side wall of the oscillator base and the elastic arm piece, and the dimension in the reciprocating motion becomes large, so that a compact product cannot be produced.

Therefore, the present invention is to provide a small-sized electric razor that does not move up and down, has good sharpness, and has no unpleasant vibration, abnormal noise, or damage.

[Means for solving the problem]

In the electric razor drive device of the present invention, the thin elastic pieces are orthogonal to the axial direction of the motor shaft from both sides of the base of the vibrator that engages with the eccentric pin of the motor shaft and drives the inner blade in the reciprocating motion direction, and In a reciprocating drive device for an electric razor, which extends in a horizontal direction orthogonal to the direction and in which a tip end portion of the thin elastic piece is fixed, a base portion of the vibrator is formed to be inclined with respect to the reciprocating motion direction, and the base portion is formed. The thin elastic pieces extend in opposite directions from the left and right ends of the vibrator, and the vibrator has a N-shaped planar shape.

[Embodiment of the invention]

The present invention will be described below based on an embodiment shown in the drawings. FIG. 2 is a plan view of a vibrator portion in the embodiment of the present invention, and FIG. As shown in FIG. 2, the base portion 2 of the vibrator 1 is formed so as to be inclined with respect to the reciprocating vibration direction. At the center of the base portion 2, a connecting rod 4 for reciprocating the inner blade 3 upward is provided. 5, a U-shaped groove is formed at the end of the connecting rod 4, and the inner blade pin 6 engaged with the U-shaped groove is driven. Further, thin elastic pieces 7 are linearly extended in opposite directions from the left and right ends of the base portion 2 of the vibrator 1. This extending direction is a direction orthogonal to the axial direction of the motor shaft (vertical direction in FIG. 3), and is also a horizontal direction orthogonal to the inner blade reciprocating direction as shown in FIG. 2, and A rigid body portion 8 is formed at the tip of the thin elastic piece 7, and the vibrator 1 is formed in a planar N-shape. This N-shape also includes an inverted N-shape (N when viewed from the back side.
It becomes a letter). The rigid body portion 8 is locked by the locking projection 10 of the body 9, and the vibrator 1 is securely held. A joint 13 attached to the motor 11 and having an eccentric pin 12 is arranged on the lower surface of the base portion 2 of the oscillator 1, and a long hole that engages with the eccentric pin 12 is formed in the oscillator 1. A beard scrap prevention packing 14 is placed on the upper surface of the vibrator 1 to close the gap with the upper surface of the body 9. On the side of the vibrator 1, a knob 16 for locking the outer blade frame 15 is urged by a spring 17 and arranged on the body 9, and the other side of the outer blade frame 15 is locked to the body protrusion. ing.

〔The invention's effect〕

When the vibrator 1 is configured as described above, the vibrator 1 moves along without the vertical movement of the vibrator, which is a drawback of the conventional structure, so that the inner blade and the outer blade are kept in close contact with each other and the sharpness is improved. is there. Also, the length L of the thin elastic piece of the vibrator (Fig. 2)
On the other hand, even if the width B (Fig. 3) is small (about 1/3), it does not matter, so it is advantageous for shortening the body, and also for buckling due to spring pressure of the inner blade, etc. L as shown in Fig. 1
Since it is received with a width of B in FIG. 3 of the present invention and with a width of L in FIG. 2, it is extremely safe. The point is that when a thin elastic piece is conventionally extended vertically, it is weak against buckling, and the oscillator has the drawback of moving up and down. It is strong, and there is no vertical movement of the vibrator, good sharpness can be secured, and the space of the vibrator is also small, which makes it possible to shorten the body.

In addition, the vibrator of the present invention does not have any useless functional area like the vibrator (hereinafter referred to as the prior art) shown in the specification and drawing of Japanese Utility Model Application Laid-Open No. 56-69361. That is, the base of the vibrator of the present invention is formed so as to be inclined with respect to the reciprocating direction, and the thin elastic pieces extend from both left and right ends of the base. Therefore, it is not rectangular like the vibrating substrate of the prior example, and therefore, there is no corner portion other than the corners of the elastic arm piece attachment portion of the prior example.

Therefore, the vibrator becomes lighter by that amount, so that vibration during use, which is an important problem of the reciprocating electric razor, can be reduced, and a comfortable electric razor can be provided. In particular, since the user's face is extremely delicate, when the blade portion is pressed against the face, if there is little vibration, it gives the user a sense of security and can enjoy shaving to the fullest. Moreover, the hand holding the electric razor does not cause any discomfort.

On the other hand, according to the present invention, the base portion of the vibrator is formed to be inclined with respect to the reciprocating vibration direction, the thin elastic piece extends from the right end and the left end of the base portion, and the vibrator has an N-shaped planar shape. Therefore, as in the prior art, the inconvenience that the left and right side walls of the rectangular vibrating base body collide with the adjacent elastic arm pieces and the reciprocating movement thereof is hindered cannot occur at all. That is,
Since the present invention is formed so as to become an inclined portion from the tip of the base portion to the center side and separate from the thin elastic piece, they do not collide with each other when large reciprocating momentum is desired or when disturbance is applied. Therefore, no damage to parts or abnormal noise is generated. Alternatively, in the case of the prior example, in order to prevent a collision between the two, it is necessary to secure a large gap between the two, resulting in a large electric razor, but the present invention is based on a base and a thin elastic piece. Since there is no need to take a particularly large space, it enables the miniaturization required for mobile devices.

As described above, according to the drive device of the present invention, the inner blade does not move up and down, the sharpness is good, and a small electric razor without unpleasant vibration, abnormal noise, or damage can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of a vibrator section showing a conventional structure,
FIG. 2 is a plan view of a vibrator portion according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of an essential part of FIG. 1 ... Oscillator 2 ... Oscillator base 3 ... Inner blade 7 ... Thin elastic piece 8 ... Rigid body 12 ... Eccentric pin

Claims (1)

[Claims] 1. A thin elastic piece is orthogonal to the axial direction of the motor shaft from both sides of the base of an oscillator which engages with an eccentric pin of the motor shaft and drives the inner blade in the reciprocating direction, and is horizontal in the direction of the reciprocating motion. In a reciprocating drive device for an electric razor, which extends in a direction and in which a tip end portion of the thin elastic piece is fixed, a base portion of the vibrator is formed to be inclined with respect to the reciprocating movement direction, and the base portion is formed from each of left and right ends of the base portion. A reciprocating drive device for an electric razor, characterized in that a thin elastic piece extends in the opposite direction to form an N-shaped planar shape of a vibrator.