JPS6219876B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating electric shaver that improves the adhesion of the cutting edge of a movable blade to the cutting edge of a fixed blade.

Generally, in this type of electric shaver, the movable blade is pressed against the fixed blade using a compression spring, so the movable blade is molded from a relatively thick steel plate of about 0.5 mm, which is the same as the fixed blade, and the movable blade is molded into a predetermined shape. It is made as rigid as possible by bending.

By the way, although the cutting edge of the movable blade is made flat by polishing the blade surface, the movable blade is affected by the deformation that occurs when the movable blade is held in a holder during the blade surface polishing. It is undeniable that the accuracy of the adhesion of the cutting edge of the fixed blade to the cutting edge of the fixed blade varies. In order to improve this adhesion, if we try to increase the thickness of the movable blade and make it more rigid, the weight will increase and the vibration noise of the movable blade will become stronger, and we will also have to increase the spring force of the compression spring. For example, this may lead to disadvantageous results such as increased motor failure, and as long as the rigid movable blade is pressed into contact with the fixed blade by means of a pressure spring, there is a limit to the improvement of the adhesion accuracy.

Therefore, in this invention, the movable blade is constructed from a thin steel plate having spring properties, and the comb-like cutting edge of this movable blade is pressed against the cutting edge of a fixed blade, so that the movable blade is perpendicular to the protruding direction of the comb-shaped blade. In a reciprocating electric shaver that slides back and forth in the direction, a large number of through holes are provided along the base of the comb-shaped cutting edge to make the cutting edge of the movable blade more elastic in the movable blade crimping direction than the movable blade base. By forming the movable blade so that it can be easily deformed, the pressure spring can be omitted, and regardless of the accuracy of the blade surface polishing, the adhesion of the movable blade tip to the fixed blade blade tip is improved, and the reduction of the movable blade allows for reciprocating motion. An object of the present invention is to provide a reciprocating electric shaver capable of suppressing tapping noise caused by inertial force.

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, 1 is a case body that houses a battery (not shown), a motor 2, etc., and 3 is a case body 1.
This is the blade case attached to the top of the case 3.
An outer cutter 4 is attached to the outer blade 4. 5 is the above motor 2
The eccentric cam 7 is a drive element that is slidably mounted on the outer surface of the top wall of the case 1, and the eccentric cam 5 is fitted into a cam receiving groove 8 formed in the drive element 7. are fitted. Reference numeral 9 denotes an inner cutter body that slides into contact with the inner surface of the outer cutter 4, and this inner cutter body 9
The inner cutter holder 10 holding the inner blade holder 10 is connected to the tip of a drive rod 11 erected on the drive element 7 .

Reference numeral 12 denotes a sharpening mechanism installed in the blade case 3, and as shown in FIG. Fixed fixed blade 1
4 and a movable blade 15 that is pressed against the fixed blade 14.
Consists of etc. Reference numeral 16 denotes a cutting edge portion for edge cutting formed at the front end of the fixed blade 14, and numeral 17 indicates a comb-shaped cutting edge portion for edge cutting formed at the front end of the movable blade 15.

The movable blade 15 is molded from a relatively thin spring steel plate of about 0.1 mm,
It is bent at the center portion 15a so that the cross-sectional shape in the front-rear direction is inverted. The movable blade 15 has its central bent portion 15a slidably supported on the main surface of a receiver 18 fixed to the fixed blade holder 13, and is slightly elastically deformed by this support. The cutting edge part 17 at the front end and the projecting piece part 19 (FIG. 3) formed at the rear end are abutted against the fixed blade 14 from an oblique direction,
The rear end of the movable blade 15 is connected to the fixed blade 14 by the projecting piece 19.
The reason why the movable blade 15 is in pressure contact with the movable blade 15 is to minimize the sliding resistance of the movable blade 15 and to stabilize the supporting state.

At the rear position of the cutting edge portion 17 of the movable blade 15,
Waist portion 20 that elastically bends the cutting edge portion 17
is formed along the cutting edge portion 17. This waist portion 20 is connected to the cutting edge portion 17 as shown in FIG.
A large number of rectangular through holes 2 arranged in a display pattern along
1, 21 ₁ , 21 ₂ ... 21n, which exists by forming the blade edge portion 1 of the movable blade 15.
7 is formed to be more easily elastically deformed in the crimping direction of the movable blade 15 than the movable blade base.

Reference numeral 22 denotes a lever pivotally attached to the vertical portion 13a of the fixed blade holder 13, one end 22a of which is locked to the central locking portion 23 of the movable blade 15, and the other end 22b. is the driver 7
The movable blade 15 is connected to a connecting piece 24 fixed to the lever 22, and as the lever 22 rotates, the movable blade 15 is slid back and forth in the directions of arrows a and b in FIG. Guide pins 25, 25 are formed on the receiver 18 and fit into the long holes 26, 26 of the movable blade 15, respectively.

According to the above embodiment, the movable blade 15 that is pressed against the fixed blade 14 is made of a thin steel plate having spring properties, thereby simplifying the structure by omitting a conventional compression spring such as a spring or a leaf spring. Furthermore, if the cutting edge of the movable blade made of a leaf spring is simply brought into oblique direction against the lower surface of the fixed blade, only the tip of the blade will hit the cutting edge of the fixed blade, resulting in a cutting function. However, in this embodiment, the waist part 20 formed along the cutting edge part 17 of the movable blade 15 acts as a transition part of elastic deformation, and the cutting edge part 17 is elastically bent. Since the cutting edge part 17 of the movable blade 15 is formed to be more elastically deformable in the movable blade crimping direction than the movable blade base part, the cutting edge part 17 of the movable blade 15 is more easily elastically deformed in the movable blade crimping direction than the movable blade base part. Even if the movable blade 15 has unevenness in the front-rear direction and can be closely pressed, and even if there are variations in the polishing accuracy of the blade surface of the movable blade 15, only the cutting edge portion 17 of the movable blade 15 is free in the sliding direction in a relatively elongated area. Since it can be elastically deformed, the adhesion in the sliding direction is also improved.

To explain the adhesion in the sliding direction in comparison with the case of using a conventional compression spring, in the conventional case, one or more spring-like compression springs are individually independent from the bottom surface of the movable blade. Because the blade was pressed against the fixed blade, the pressure force was unevenly distributed in the direction of the reciprocating movement of the movable blade, and the movable blade only came into sliding contact with the fixed blade locally, which tended to reduce the shearing effect. Furthermore, one end of the crimping spring is fixed and the other end is pressed locally against the movable blade, so when the movable blade vibrates, the crimping spring tilts with one end as the fixed point and twists, causing the crimping force to decrease. However, according to the configuration of the present invention, the movable blade 15 itself has elastic force, and the blade edge portion 17
Every part of the throat has the same elastic force, so
The above drawbacks can be overcome.

In order to bend the movable blade 15 evenly in the sliding direction, the rectangular through holes 21 may be set narrower and closer to each other. Furthermore, when forming the waist portion 20, by changing the shape and combination distribution of the rectangular through holes 21 as shown in FIG. 4, the cutting edge portion 17 of the movable blade 15 is gently bent away from the waist portion 20. This allows the fixed blade 14 to better follow the cutting edge portion 16. Further, the movable blade 15 is bent in an inverted shape so that its cutting edge portion 17 is connected to the cutting edge portion 1 of the fixed blade 14.
Although the lower surface of the blade 6 is abutted from an oblique direction, the fixed blade 14 may be curved in an arched shape and abutted against the fixed blade 14. Furthermore, even if the movable blade 15 remains flat, if the fixed blade 14 is bent into a U-shape as shown in FIG. 16 in an oblique direction, and in this case as well, the cutting edge part 17 of the movable blade 15 can be elastically bent from the waist part 20 and brought into good contact with the cutting edge part 16 of the fixed blade 14.

As described above, in this invention, the movable blade 15 is made of a thin steel plate having spring properties, and the movable blade 15 is moved by pressing the comb-shaped cutting edge 17 of the movable blade 15 against the cutting edge 16 of the fixed blade 14. In a reciprocating electric shaver in which the comb blades are slid back and forth in a direction perpendicular to the protruding direction, a large number of through holes 21 are provided along the base of the comb blade-like cutting edge part 17, and the cutting edge part 1 of the movable blade 15 is
By forming the movable blade 7 to be more elastically deformable in the crimping direction of the movable blade 15 than the movable blade base, the blade edge of the movable blade 15 is not affected by the deformation or bending of the base due to the reciprocating driving force applied to the movable blade 15. Even if the flatness of the portion 17 varies, the cutting edge part 17 of the movable blade 15 can be slid in close contact with the cutting edge part 16 of the fixed blade 14, thereby improving cutting quality and suppressing tapping noise.

In addition, a large number of through holes are provided along the cutting edge portion 17 of the movable blade 15 to reduce the sliding area with the fixed blade 14 and reduce the load when driving the movable blade 15. It has the effect of making it possible to make effective use of.

Moreover, even if the blade edge 16 of the fixed blade 14 bends toward the movable blade 15 when the fixed blade 14 side is strongly pressed against the skin, the blade edge 17 follows this and deforms to maintain the close contact state, and the base Since the blade reciprocates without being affected by this, it not only prevents one of the blade edges 16 and 17 from lifting up and getting hair caught in between, but also changes the driving speed and reduces the cutting effect. It can also be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the head of an example of a reciprocating electric shaver according to the present invention, FIG. 2 is an enlarged sectional view of the shaving mechanism of the electric shaver, FIGS.
The figure is a bottom view of the edge mechanism, and FIG. 5 is a cross-sectional view showing the deformed structure of the waist. 14...Fixed blade, 15...Movable blade, 16...Blade tip of fixed blade 14, 17...Blade tip of movable blade 15, 20...Waist, 21...Through hole.

Claims (1)

[Claims] 1. The movable blade 15 is made of a thin steel plate with spring properties, and the movable blade 15 is pressed against the blade edge 16 of the fixed blade 14 by pressing the comb-like cutting edge 17 of the movable blade 15 against the cutting edge 16 of the fixed blade 14.
In the reciprocating electric shaver in which the movable blades 15 are slid back and forth in a direction orthogonal to the protruding direction of the movable blades, a large number of through holes 21 are provided along the base of the comb-shaped cutting edge part 17, and the cutting edge part 17 of the movable blade 15 is A reciprocating electric shaver characterized in that the movable blade 15 is formed to be more easily elastically deformed in the crimping direction than the movable blade base.