JPS5924304Y2 - reciprocating electric razor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a reciprocating electric shaver in which the adhesiveness of the cutting edge of a movable blade to the cutting edge of a fixed blade is improved.

Generally, in this type of electric shaver, the movable blade is pressed into contact with the fixed blade using a compression spring, so the movable blade is molded from a relatively thick steel plate of about 5 mm and has the same Q as the fixed blade. The bending process makes it as rigid as possible.

Incidentally, 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 make the movable blade more rigid by increasing its thickness, 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 an increase in the load on the motor, 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.

For this reason, the inventors have already constructed a movable blade with a leaf spring, and fixed this movable blade with a backing plate in a state where the elastic joint band formed near the blade tip is bent elastically. By pressing the blade against the blade and bringing the blade edge into close contact with the blade edge of the fixed blade, the pressure spring can be omitted, and the adhesiveness of the blade edge of the movable blade to the blade edge of the fixed blade can be improved regardless of the blade surface polishing accuracy. We have proposed a reciprocating electric shaver that can reduce the number of movable blades and suppress the tapping noise caused by inertia during reciprocating motion.

However, if the above structure is applied to movable and fixed blades with arcuate cutting edge lines, the movable blade will not work unless the distribution of elastic force from the knot zone of the movable blade to the tip of the blade is strictly considered. The center part of the arcuate cutting edge in the reciprocating direction of the blade is the one that comes into contact with the cutting edge of the fixed blade first, and if the movable blade is pressed against the fixed blade to a contact pressure that is sufficient to cut the mold, The center part is pressed most strongly, and the contact condition of the entire blade group is regulated at this center part, and as a result, the above-mentioned both end parts are not brought into close contact with the cutting edge of the fixed blade and may float up, which may adversely affect the shearing action. There is.

Therefore, this invention uses a simple configuration in which a backing plate that presses the movable blade locally presses only both ends of the movable blade in the reciprocating direction, so that the cutting edge of the movable blade is evenly applied to the cutting edge of the fixed blade. It is an object of the present invention to provide a reciprocating electric shaver that can be brought into close contact with the skin, thereby improving the shearing effect.

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

Fig. 1 shows a reciprocating electric razor exclusively used for shaving eyebrows. The grip part 2 includes a power source battery 4.
, a motor 5 generated by the battery 4 and a mechanism 6 (Fig. 2) for converting the rotational force of the motor 5 into linear reciprocating motion are housed, and the blade housing 3 houses eyebrows, which will be described later. Equipped with a blade block for edge shaving.

Reference numeral 7 designates an operating knob for a power switch (not shown) for the motor 5.

As shown in FIG. 2, the reciprocating motion conversion mechanism 6 includes a driving gear 9 connected to the rotating shaft 8 of the motor 5, and a driven gear 11 rotatably held by a gear holder 10 and meshing with the driving gear 9. ．． It consists of an eccentric cam part 12 integrally formed with the driven gear 11, a lever 13, etc., and a cam receiving part 14 formed at one end of the lever 13 is fitted into the cam part 12.

Reference numerals 15 and 16 denote movable and fixed blades constituting the edge shaving blade block 17, each having cutting edge portions 18 and 19 whose cutting edge lines are arcuate as shown in FIGS. 3 and 4, respectively. .19 are exposed and set on both sides of the blade storage case 3.

The movable blade 15 is made from a relatively thin leaf spring of about 0.1 mm, and is shaped like a square at the center portion 15a in a direction (direction of arrow A) perpendicular to the reciprocating direction (direction of arrow a). It is formed by bending.

A large number of rectangular through holes 20 are arranged in a formation in the vicinity of the cutting edge portion 18 along the reciprocating direction;
These many through holes 20 constitute a strong joint band 21.

Reference numeral 22 denotes a backing plate that is fixed to the blade storage case 3 side and presses the folded ridge portion 15 a of the movable blade 15 , and a surface 22 a of this backing plate 22 that faces the movable blade 15 .
On the sides, both ends 22b in the reciprocating direction are provided.

Protrusions 23, 23 are formed at positions 22b and 22b, respectively, so that the central part 22c is at a different level.

The protrusions 23.23 locally press only the ends 15b, 15b of the movable blade 15 in the reciprocating direction, thereby elastically deforming the movable blade 15.

Reference numeral 24 denotes an engagement hole formed at one end of the movable blade 15 in the reciprocating direction, and an engagement protrusion 25 at the other end of the lever 13 is engaged with the engagement hole 24. The rotational force of the portion 12 is transmitted to the movable blade 15 via the lever 13 as a reciprocating linear motion.

As is clear from the above configuration, by configuring the movable blade 15 that is pressed against the fixed blade 16 using a leaf spring, a conventional pressure spring such as a spring or a leaf spring is omitted, thereby simplifying the structure.

Further, the elastic joint band 21 formed near the cutting edge portion 18 of the movable blade 15 and along the reciprocating direction acts as a transition portion of elastic deformation, and the cutting edge portion 18 is elastically bent. Therefore, the cutting edge part 18 of the movable blade 15 can easily follow the cutting edge part 19 of the fixed blade 16 in the front and back direction, and can be brought into close pressure contact with the cutting edge part 19 of the fixed blade 16. Furthermore, there is no variation in the accuracy of polishing the blade surface of the movable blade 15. However, since only the cutting edge portion 18 of the movable blade 15 can be elastically deformed in a relatively elongated area in the sliding direction, the adhesion in the sliding direction is also improved.

In particular, even if the cutting edge line of the cutting edge portion 18 of the movable blade 15 is arc-shaped, both ends 15b of the movable blade 15 in the reciprocating direction
, 15b are pressed by the abutting plate 22 and elastically deformed, so that both end portions of the cutting edge portion 18 of the movable blade 5 are prevented from lifting up relative to the cutting edge portion 19 of the fixed blade 16, as shown in FIG. In this way, the distribution of the pressure force can be equalized over the entire area of the cutting edge portion 18 of the blade movable blade 15, and the sharpness can be improved.

In the above embodiment, the projections 23 are provided at both ends 22b, 22b of the backing plate 22 in the reciprocating direction of the movable blade 15.
．． 23, and the surface 22a of the backing plate 22 facing the movable blade 15 is configured to have different levels between the end portions 22b, 22b and the center portion 22C.
As shown in the figure, by configuring the central portion 22C of the backing plate 22 as a blank space, both ends 15b, 15b of the movable blade 15 may be pressed only by the ends 22b, 22b.

As mentioned above, this invention forms an elastic joint band along the reciprocating direction near the cutting edge of the movable blade composed of a leaf spring,
By elastically bending the cutting edge from this elastic joint band and pressing it against the cutting edge of the fixed blade, the structure can be simplified, and even if the flatness of the cutting edge of the movable blade varies, the cutting edge can In particular, the surface side facing the movable blade of the backing plate that presses the movable blade against the fixed blade is configured to have different levels, so that the reciprocating movement of the movable blade can be made to closely follow the cutting edge of the fixed blade. Since only both ends of the movable blade are pressed, even if the cutting edge line of the movable blade has an arc shape, the entire area of the cutting edge can be evenly brought into close contact with the fixed blade. Therefore, it is possible to provide a reciprocating electric shaver that can improve the cutting quality.

[Brief explanation of drawings]

FIG. 1 is an external view showing an example of a reciprocating electric shaver according to the invention, FIG. 2 is a side sectional view of the head of the electric shaver, and FIG. 3 is an exploded perspective view of the blade block of the electric shaver. FIG. 4 is a cross-sectional view of the assembled state, FIG. 5 is an explanatory view of the operation of the main parts, and FIG. 6 is an explanatory view of the deformed structure of the main parts. 15...Movable blade, 15b, 15b...
Both ends of the movable blade 15, 16...Fixed blade, 18,
19...Blade tip, 20...Through hole, 21
...Elastic joint band, 22...Packing plate, 2
2 b, 22 b...Both ends of the backing plate 22,
22 C... Central part of the backing plate 22.

Claims (1)

[Scope of utility model registration request] A movable blade 15 having a cutting edge portion 18 with an arcuate cutting edge line is constituted by a leaf spring, and an elastic blade consisting of a large number of through holes 20 located near the cutting edge portion 18 and arranged along the reciprocating direction. A joint band 21 is formed on the movable blade 15, and the movable blade 15
The fixed blade 16 and the backing plate 22 that presses the fixed blade 16 side.
The movable blade 15 of the backing plate 22 is arranged in such a manner that the area from the elastic joint 21 to the cutting edge line is elastically deformed.
The surface 22a facing the movable blade 15 is configured to have different levels between the ends 22b, 22b in the reciprocating direction and the central portion 22C so that only the ends 15b, 15b in the reciprocating direction of the movable blade 15 are pressed. Electric razor.