JPH0355089A - Electric shaver of reciprocating type - Google Patents

Abstract

PURPOSE:To improve abrasion resistance and sliding resistance by making the diameter of a second eccentric shaft for oscillating a balancer, smaller than the rotational locus outerdiameter of a first eccentric shaft for oscillating the oscillator of a crank shaft fitted firmly on a motor shaft. CONSTITUTION:The shaft diameter of a first eccentric shaft 5 is equal to or thinner than the shaft diameter of a second eccentric shaft 6, and the width of a connecting section 22 is also equal to or smaller than the shaft diameter of the second eccentric shaft 6, in the same manner. Besides, on the shaft 29 of a balancer 8, a crank arm 30 is rotationally fixed, and a C-shaped section 31 for releasing the side section of a penetration hole in the shape of C is opened roughly in the right angle direction to the oscillating direction of the balancer 8, and when it is pushed into the second eccentric shaft from the side section, then they can be easily combined with each other, or they are not to be separated from each other at the time of oscillating the balancer 8. As a result, sliding resistance can be reduced, and abrasion resistance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a reciprocating electric shaver with anti-vibration measures.

[Prior Art] For conventional reciprocating electric shavers, various methods for driving the inner blade have been proposed. The drawback was that the motor shaft received the reaction force when driving the blade, causing the main body to vibrate. Therefore, there is also a system, such as Japanese Patent Publication No. 57-24150, which uses a balancer to cancel out the vibrations generated by the inertia of the vibrator. In the conversion mechanism for the joint between the balancer and the crankshaft, the crankshaft must have no protrusions in order to ensure ease of assembling the balancer and to smoothly insert the crankshaft into the through hole of the balancer. Therefore, the diameter of the second eccentric shaft that swings the balancer must be much larger than the outer diameter of the rotation trajectory of the first eccentric shaft that swings the vibrator, since it is eccentric in the opposite phase to the first eccentric shaft. Met.

[Problems to be Solved by the Invention] However, in conventional reciprocating electric shavers equipped with anti-vibration measures, since the diameter of the second eccentric shaft is large, the sliding speed with the through hole increases, resulting in deterioration of wear resistance and sliding. There was a problem with improving dynamic resistance. Therefore, in the present invention, the conventional problems are solved by improving the wear resistance and sliding resistance of the balancer through hole and reducing vibration by making the diameter of the second eccentric shaft smaller than the outer diameter of the rotation locus of the first eccentric shaft. The purpose is to resolve the issue.

[Means for Solving the Problems] The reciprocating electric shaver of the present invention has a second eccentric shaft that swings the balancer, which swings the balancer, with a rotation locus outer diameter of the first eccentric shaft that swings the vibrator of the crankshaft fixed to the motor shaft. It is characterized by having a small eccentric shaft diameter.

Hereinafter, the details of the present invention will be shown by examples.

[Embodiment] FIG. 1 is a sectional view of an inner blade drive section in an embodiment of the present invention. A diaphragm 2 having elasticity extending to both sides of the vibrator 1
The end portion 3 formed at the tip thereof is fixed to the case 4. The diaphragm 2 is made of a wide thin elastic plate, and although it deforms in the direction of the arrow shown in FIG. 2 and the vibrator 1 moves, it is difficult to deform in the direction perpendicular to this arrow. A track hole 7 into which the first eccentric shaft 5 is inserted is formed in the lower surface of the vibrator 1. A track-shaped hole 9 is bored in the center of the balancer 8, and an elastic plate 10 having elasticity is formed extending to both sides of the balancer 8. The terminal end 11 of the elastic plate 10 is fixed to the case 4. There is. A weight 12 is fixed to the lower surface of the balancer 8 by a pin 13 projecting from the balancer 8. Balancer 8 and weight 1
The total weight of the oscillator block 2 is approximately the same as that of the oscillator block 28 which is made up of the push-up spring 25, the inner cutter attachment 26, the E-ring 27, and the inner cutter 14 attached to the oscillator 1.

As shown in FIG. 3, the crankshaft 15 includes a shaft base l6, a first eccentric shaft 5 that swings the vibrator 1, a second eccentric shaft 6 that swings the balancer 8, and a first eccentric shaft 5. Second eccentric shaft 6
A cantering shaft 17 consisting of a connecting portion 22 connecting the shaft base 1
The first eccentric shaft 5 is
and a second eccentric shaft 6 are fixed so as to have approximately the same eccentricity and a phase of approximately 180°.

In the conventional example shown in FIG. 6, the center 33 of the first eccentric shaft 5 and the center 34 of the second eccentric shaft 6 are equidistant from the rotation center 32, and the first eccentric shaft 5 is formed on the second eccentric shaft 6. In order to achieve this, a diameter much larger than the outer diameter A of the rotation locus of the first eccentric shaft 5 was required, and the required quality was not satisfied due to the decrease in wear resistance and the increase in sliding resistance.

In order to ensure the required quality, the drive shaft 1 must be
7 can pass through the through hole (track-shaped hole 9 in this embodiment) of the balancer 8 and is connected to the first eccentric shaft 5 and the second eccentric shaft 6.
A small shaft diameter is required to reduce sliding resistance and improve wear resistance.

Therefore, in this embodiment, the shaft diameter of the first eccentric shaft 5 is the same as or smaller than the shaft diameter of the second eccentric shaft 6, and the width of the connecting portion 22 is also the same or smaller than the shaft diameter of the second eccentric shaft 6. be.

In addition, in the embodiment shown in FIG. 4, a crank arm 30 is rotatably fixed to the shaft 29 of the balancer 8, and a C-shaped hole 31 having a C-shaped opening on the side of the through hole is arranged in the direction of vibration of the balancer 8. It opens in the direction perpendicular to the second eccentric shaft, and can be easily assembled by pushing it into the second eccentric shaft from the side, and is designed so that it will not come off when the balancer 8 swings. This embodiment also has the same effects as the previous embodiment, and improves ease of assembly, reduces sliding resistance, and improves wear resistance.

Next, to explain the operation, in the position of the crankshaft 15 shown in FIG. 5(a), the diaphragm 2 and the elastic plate 10 are not deformed;
As it rotates to the state of (b), the m moving plate 2 and the elastic plate 1
0 gradually deforms in the opposite direction while the vibrator l and balancer 8 move until they reach their dead center. As the diaphragm 2 and the elastic plate 10 rotate to the state shown in (C), the deformation of the diaphragm 2 and the elastic plate 10 gradually decreases, and this time the deformation of the diaphragm 2 and the elastic plate 10 deforms in the opposite direction, until the dead center point in (d) is reached. The vibrator 1 and balancer 8 move in exactly opposite directions until. In other words, the vibrator block 28 and balancer block (balancer 8 and weights 1 and 2) are
Since the amount of eccentricity and the weight are substantially the same, the inertia forces applied to the motor shaft 18 are the same and in opposite directions. Therefore, the inertial force applied to the motor shaft 18 can be canceled out, and vibrations can be reduced.

Although the embodiments have been described above, the present invention can be applied not only to the above embodiments but also to electrical products using a mechanism that converts rotational motion into reciprocating motion.

[Effects of the Invention] As described above, according to the present invention, by reducing the shaft diameter of the second eccentric shaft 6, the driving resistance of the balancer 8 can be reduced and the wear resistance can be improved, and vibration can be reduced. It has this effect.

[Brief explanation of drawings]

FIG. 1 is a main cross-sectional view showing one embodiment of the inner blade drive unit of the present invention. Figure 2 is an exploded perspective view of the same as above. FIG. 3 is an explanatory diagram of a crankshaft in one embodiment of the present invention. FIG. 4 is a perspective view of the balancer drive mechanism of another embodiment. Figure 5 is an explanatory diagram of the operation of the vibrator, balancer, and crankshaft. Figure 6 is an explanatory diagram of a conventional crankshaft. 1... Vibrator 2... Vibration plate 5... First eccentric shaft 6... Second eccentric shaft 7... Track hole 8... Balancer 9... ... Track-shaped hole 10 ... Elastic plate 12 ... Weight 14 ... Inner blade 15 ... Crankshaft 22 ... Connection part 23 ... Motor 24 ... Outer blade 28... Vibrator block 30... Crank arm 31... C-shaped hole

Claims (4)

[Claims] (1) In a reciprocating electric shaver equipped with a vibrator with an inner cutter attached to the top and a balancer that swings below the vibrator with a phase shift of approximately 180°, the vibrator of the crankshaft is fixed to the motor shaft. A reciprocating electric shaver characterized in that the diameter of the second eccentric shaft for swinging the balancer is smaller than the outer diameter of the rotation locus of the first eccentric shaft for swinging the balancer. (2) The reciprocating electric shaver according to claim 1, wherein the width of the connecting portion between the first eccentric shaft and the second eccentric shaft is equal to or narrower than the diameter of the second eccentric shaft. (3) One through hole of the crank arm is rotatably fixed to the shaft protruding from the balancer, and the other through hole is opened in a C-shape on the side so that it can be loosely fitted onto the second eccentric shaft. The reciprocating electric shaver according to claim 1, characterized in that: (4) Claim 1 characterized in that a weight is fixed to the balancer so as to have approximately the same weight as the vibrator block.
The reciprocating electric razor listed.