JPS6346708B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive device for reducing the noise of a reciprocating electric shaver.

[Conventional technology]

The conventional reciprocating electric shaver drive device has a first
A pair of thin elastic legs 1 as shown in FIG.
It has a structure in which a vibrator 1 having a diameter of It was a matter of composition.

[Problem that the invention seeks to solve]

However, in the above-mentioned prior art, as shown in FIG. 1, the thin elastic leg 1c of the vibrator 1 moves approximately in rotation with one end fixed, and the vibrator 1 does not move in complete parallel motion, but has a displacement of A. It is a movement that necessarily has vertical movement. Therefore, as shown in FIG. 2, vertical frictional force naturally acts on the eccentric pin 3 that engages with the elongated hole 1d, which is the engagement portion of the vibrator 1. Further, noise can be reduced by reducing the play between the elongated hole 1d and the eccentric pin 3, but if the play is reduced, the surface pressure of the eccentric pin 3 will further increase, and this frictional force will act even more. In the motor 2 generally used for razors, the positional relationship between the magnet 13 and the laminated core 14 of the motor 2 is shifted so that the motor shaft 4 is attracted downward. Usually, it is supported by a thrust receiver 6, and in this case, the motor 2 rotates quietly.

However, this suction force cannot be made extremely strong so as not to damage the motor characteristics, and when the above-mentioned vertical frictional force becomes strong, the motor shaft 4 may separate from or hit the thrust receiver 6. There is a problem in that this occurs and comes into contact with and separates from the thrust receiver 6, producing abnormal noise. The present invention aims to solve these problems, and its purpose is to restrict the vertical movement of the motor shaft 4 in the axial direction, prevent the generation of abnormal noise, and realize low-noise reciprocation. We are trying to provide a type of electric shaver.

[Means for solving problems]

The drive device for a reciprocating electric shaver of the present invention includes: (1) a motor 2 that serves as a drive source for the reciprocating electric shaver; An eccentric pin 3 protruding eccentrically in the direction in which the vibrator 1 of the fixed joint portion 11 is disposed, and a vibrator 1 that is engaged with the tip of the eccentric pin 3 and transmits the reciprocating motion of the inner cutter. The vibrator 1 has a base 1a serving as a base, and a connecting rod 1 protruding from the center of the base 1a to connect with the inner cutter and cause it to reciprocate.
b, a thin elastic piece 1c formed hanging from both ends of the base 1a in the direction in which the motor 2 is disposed, and a thin elastic piece 1c formed in the center of the base 1a in the direction in which the motor 2 is disposed and engaged with the eccentric pin 3; The motor shaft 4 has an engaging portion 1d that is engaged with each other, and is generated between the engaging portion 1d and the eccentric pin 3 due to minute vertical movements of the vibrator 1 that occur as the vibrator 1 reciprocates. The present invention is characterized in that it has means for applying a biasing force greater than the vertical frictional force in the axial direction to the motor shaft 4 in the axial direction in the direction in which the thrust bearing 6 is disposed.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings. In FIG. 3, the vibrator 1 has a base 1a, a connecting rod 1b that projects above the center of the base 1a and connects with the inner cutter and causes it to reciprocate, and a connecting rod 1b that hangs down from both ends of the base 1a. The vibrator 1 is formed of a thin elastic piece 1c and a long hole 1d, which is an engaging part of the vibrator 1 and is disposed below the center of the base 1a and is engaged with the eccentric pin 3.
This basic configuration is common to each embodiment. In FIG. 3, the upper end surface of the eccentric pin 3 fixed to the motor shaft 4 is pressed by a cantilevered elastic plate 7 extending into the elongated hole 1d of the vibrator 1, and a downward biasing force is applied to the motor shaft 4. In addition, in FIG. 4, a compression coil spring 9 is interposed in the small diameter portion 8 at the tip of the eccentric pin 3, and is engaged with the protrusion 10 on the upper surface of the elongated hole 1d of the vibrator 1, thereby urging the motor shaft 4 downward. In FIG. 5, a fin 12 is provided on the joint portion 11 of the eccentric pin 3 to apply wind force in a direction that urges the motor shaft 4 downward when the motor 15 normally rotates. In the embodiment shown in FIG. 3, since the eccentric pin 3 moves in the front-rear direction, sliding occurs between it and the elastic plate 7, and in the embodiment shown in FIG. 4, the inner periphery of the compression coil spring 9 Rotating and sliding contact occurs between the pin 3 and the small diameter portion 8, and in the example shown in FIG. 5, wind noise of the fin 12 occurs. In other words, since the motor shaft 4 is pressed downward, a small amount of sliding noise and wind noise will be generated, but it will be proportional to the impact noise between metals generated between the motor shaft 4 and the thrust receiver 6. This results in much less noise.

〔Effect of the invention〕

As described above, according to the present invention, the axis of the motor shaft is generated between the elongated hole provided in the vibrator and the eccentric pin due to the minute vertical movement of the vibrator that occurs as the vibrator reciprocates. By providing means for applying a biasing force larger than the vertical friction force in the axial direction of the motor shaft in the direction in which the thrust receiver is arranged, the vertical movement of the motor shaft is restricted and the motor shaft is pressed in the direction of the thrust receiver.
The impact force generated between the motor shaft and the thrust receiver is reduced, preventing abnormal noise and reducing noise. Additionally, motors are inherently more magnetically efficient if the magnets and laminated cores do not shift too much.
Since no more suction force than necessary is required on the motor shaft, it also satisfies the fact that less suction force is desirable from the viewpoint of the characteristics of the motor.

It is also possible to weaken vibrations caused by resonance of the motor shaft caused by a specific rotation speed of the motor.

Furthermore, as mentioned above, by regulating the vertical movement of the motor shaft in the axial direction, the impact force between the motor shaft and the thrust receiver is reduced, the effect of vertical vibration on the inner cutter is weakened, and the parallel movement of the inner cutter is more stable. This has the effect of improving sharpness.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing conventional examples;
4 and 5 are views showing the present invention. 1... Vibrator, 1c... Thin elastic leg, 1a... Base,
1d...Engagement part (long hole), 1b...Connecting rod, 2...Motor, 3...Eccentric pin, 4...Motor shaft, 6...Thrust receiver, 7...Cantilevered elastic plate, 8...Small diameter part, 9...Compression Elastic plate, 10...Protrusion, 11...Joint part, 12
...Fin.

Claims (1)

[Claims] 1. Vibration of a motor 2 that serves as a drive source for a reciprocating electric shaver, and a joint portion 11 fixed to the distal end of a motor shaft 4 in the direction in which the vibrator 1 is disposed inside the motor 2. The vibrator includes an eccentric pin 3 that is eccentrically protruded in the direction in which the blade 1 is disposed, and a vibrator 1 that is engaged with the tip of the eccentric pin 3 and transmits the reciprocating motion of the inner cutter. 1 includes a base 1a serving as a base, a connecting rod 1b protruding from the center of the base 1a to connect with the inner cutter and cause it to reciprocate, and the base 1a.
Thin elastic pieces 1c are formed to hang down from both ends in the direction in which the motor 2 is disposed, and an engaging part is formed in the center of the base 1a in the direction in which the motor 2 is disposed and is engaged with the eccentric pin 3. 1d, which is generated as the vibrator 1 reciprocates.
Due to the slight up-and-down movement of 1. A reciprocating electric shaver drive device, characterized in that it has means applied in the setting direction. 2. The vibrator 1 is formed with a cantilevered elastic plate 7 extending on the inner surface of the engaging portion 1d and having elasticity to press the upper end surface of the eccentric pin 3. The drive device for a reciprocating electric shaver according to item 1. 3. The vibrator 1 has a protrusion 10 that protrudes from the inner upper surface of the engaging portion 1d and on which the coil spring 9 is locked, and the tip of the eccentric pin 3 through which the coil spring 9 is inserted is connected to the eccentric pin 3. 2. The reciprocating electric shaver drive device according to claim 1, further comprising a small diameter portion 8 smaller than the outer diameter of the reciprocating electric shaver. 4. The reciprocating electric motor according to claim 1, wherein the eccentric pin 3 has a fin 12 on a side surface of a joint portion 11 of the eccentric pin 3 for applying wind force in the direction in which the motor 2 is disposed. Razor drive device.