JPH04343883A - Reciprocating type electric shaver - Google Patents

Abstract

PURPOSE:To simplify the manufacture of an inner blade. CONSTITUTION:In a reciprocating electric shaver comprising an outer blade 2 formed into the shape of a parallelepiped dome curving along the direction A of sliding of an inner blade 4, the inner blade 4 comprises a number of disc- shaped small blades 7 arranged in parallel and at predetermined intervals in an inner blade holder 9 along the direction A of sliding of the inner blade and the small blades 7 have their diameters minimized at both ends of the direction A of sliding of the inner blade and gradually enlarged toward the center of the direction A of sliding of the inner blade. Therefore, the inner blade 4 can be easily machined and edged only by centerless polishing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating electric shaver, and more particularly to a reciprocating electric shaver having an outer cutter having a curved surface along the reciprocating sliding direction of the inner cutter.

0002

[Prior Art] As a reciprocating electric shaver having an outer cutter of this kind of shape, for example, as disclosed in Japanese Utility Model Application Publication No. 50-3788, the inner cutter is the inner cutter of a normal reciprocating electric shaver. differs from linear reciprocating motion in a circular arc reciprocating motion, but the structure of this inner cutter is that semicircular cutter blades with the same radius are placed in a dome-shaped inner cutter holder at predetermined intervals in the sliding direction of the inner cutter. A large number of them are arranged in parallel and buried. According to this, because of the shape of the outer cutter, it is easy to fit the outer cutter even on the concave curved surface under the chin, and it becomes easier to shave the beard in that area.

0003

[Problem to be Solved by the Invention] However, in the above-mentioned conventional example, all of the cutting edges of a large number of small blades constituting the inner cutter are buried in the inner cutter holder so that they are aligned along the concave curved inner surface of the outer cutter. is difficult. Furthermore, it is not easy to polish each small blade. The present invention aims at simplifying the manufacturing of the inner cutter 4 in a reciprocating electric shaver equipped with the outer cutter 2 having a curved surface that curves along the sliding direction A of the inner cutter 4 as described above. With the goal.

0004

[Means for Solving the Problems] In the reciprocating electric shaver of the present invention, as illustrated in FIG. The cutter blades 7 are arranged parallel to each other at a predetermined interval in the sliding direction A, and the diameter of the cutter blades 7 is the smallest in the diameter of the cutter blades 7 at both ends in the inner blade sliding direction A, and in the center in the inner blade sliding direction A. The diameter of the small blade 7 is gradually increased up to .

[0005]

[Operation] Each cutter blade 7 has a different diameter, but all are formed into a disc shape, so just by aligning the centers of each cutter blade 7 and arranging them, all the cutting edges can be aligned with the concave curve of the outer cutter 2. It can be aligned to fit the inside surface. Before assembling the inner cutter 4, by stacking only the small blades 7 of the same diameter to form a cylindrical shape, centerless polishing alone is sufficient and the blades can be easily attached.

[0006]

According to the reciprocating electric shaver of the present invention, the inner cutter 4 that follows the concave curved inner surface of the outer cutter 2 having a curved surface along the sliding direction A of the inner cutter 4 can be easily manufactured. be able to.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a reciprocating electric shaver according to the present invention will be described with reference to FIGS. 1 to 5. In Figure 1,
1 is a main body case, 2 is an outer blade removably provided with an outer cutter holder 3 on the upper part of the main body case 1, 4 is an inner blade, and 5 is a drive rod that swings in the direction of arrow A around a pivot 6. The inner cutter 4 connected to the upper end of the drive rod 5 is caused to reciprocate and slide against the inner surface of the outer cutter 2.

The outer cutter 2 is formed into a rectangular dome shape, and is curved in an outward convex shape with a predetermined radius of curvature along the sliding direction A of the inner cutter 4, and is curved in a convex shape along a direction perpendicular to the direction A. It is curved in an outward convex shape with a radius of curvature smaller than the radius of curvature.

The inner cutter 4 has a disc-shaped small blade 7 attached to an inner cutter holder 9.
A large number of cutter blades 7 are arranged in parallel at predetermined intervals in the inner cutter sliding direction A, and the cutter blades 7 at both ends in the inner cutter sliding direction A have the smallest diameter; The diameter of the small blade 7 gradually increases as it reaches the center of A.

As shown in FIGS. 2 and 3, the inner cutter holder 9 consists of two connecting tubes 10 and a spacer 11, and each cutter blade 7 has two holes 12, which are connected to each other. tube 10
A large number of them are inserted through the spacers 11 so as to be arranged in parallel. The connecting pipe 10 is made of a metal such as aluminum, brass, or stainless steel, which is softer than the small blade 7.
Push a mechanical or hydraulic pipe expanding means, such as a burnishing rod B (see FIG. 3) as a mechanical means, into the hollow interior of 0.
The connecting pipe 10 is expanded in the diameter direction and the connecting pipe 10 is attached to the small blade 7.
By biting into the small blade 7, the small blade 7 is fixed to the connecting pipe 10. In this way, by passing the small blade 7 through the connecting pipe 10, the inner cutter 4 whose cutting edge is easily aligned along the concave curved inner surface of the outer cutter 2 can be obtained. Note that one or three or more connecting pipes 10 may be used, and the connecting pipes 10 may be set in consideration of fixing strength, pipe diameter, and small blade diameter.

The cutter blades 7 with different diameters are hardened and then sharpened in a process before being assembled into the inner cutter holder 9. During this sharpening, the cutter blades 7 with the same diameter are A grinding wheel is passed through the polishing rod 13 and set in a cylindrical shape, and this is subjected to centerless polishing as shown in FIG. By doing this, you can easily attach the blade.

FIG. 6 shows another embodiment in which each small blade 7
Almost the lower half of the blade is insert molded into the inner blade holder 9 made of plastic. In this case, in order to hold the cutter blades 7 inside the mold, the inner cutter holder 9 made of plastic can be used to embed and fix the cutter blades 7 at predetermined intervals without necessarily using the connecting tube 10 and the spacer 11. In the above embodiment, the spacer 11 or the part that determines the pitch between the cutter blades 7 is
Regardless of the diameter of the small blade, the length of the inner cutter 4 is the same over the entire length from one end to the other, so the amount of protrusion of the cutter blade 7 differs between the ends and the center of the inner cutter 4, and there is a portion where the amount of protrusion is small. In this case, it is difficult to cut the long hair, and the blow-out of hair becomes noticeable, and conversely, in the part where there is a lot of hair, the small blade 7 becomes easy to bend, and the cutting quality deteriorates.
Moreover, the cutting edge becomes easily damaged. For this purpose, the diameter of the spacer 11 etc. may be made to correspond to the diameter of the small blade so that the amount of protrusion is approximately constant. In addition, if you want to make the spacer diameter satisfactory for cutting long hair and hair debris at both ends of the inner blade 4 and keep it constant over the entire length, you can make the plate thickness of the small blade 7 thicker toward the center, or It is also possible to use a cutter blade material that has high strength despite its thickness, or to take measures in shape such as reinforcing ribs to increase the strength of the cutter blade itself. In addition, the cutter blades 7 do not have to change the diameter of each cutter blade 7 sequentially, but instead make a plurality of adjacent cutter blades the same diameter, change the diameter for each block, and grind the blades so that they follow the curved inner wall of the outer cutter 2. If you do this, you can easily make it without increasing the polishing cost too much.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view showing main parts.

FIG. 2 is a perspective view showing a state in which the inner cutter is being assembled.

FIG. 3 is a front view of the inner cutter.

FIG. 4 is a front view showing a state in which small blades of the same diameter are set for sharpening.

FIG. 5 is a diagram showing the state of centerless polishing of the cutter blade.

FIG. 6 is a front view of an inner cutter showing another embodiment.

[Explanation of symbols]

1 Main body case 2 Outer blade 4 Inner blade 7 Small blade 9 Inner blade holder

Claims (1)

[Claims] 1. In a reciprocating electric shaver, the inner cutter 4 reciprocates against the inner surface of the outer cutter 2, and the outer cutter 2 has a curved surface along the sliding direction A of the inner cutter 4. , the inner cutter 4 has a plurality of disc-shaped cutter blades 7 disposed in an inner cutter holder 9 in parallel at predetermined intervals in the inner cutter sliding direction A.
The diameter of the reciprocating type is characterized in that the diameter of the small blades 7 at both ends in the inner blade sliding direction A is the smallest, and the diameter gradually increases as the small blades 7 reach the center in the inner blade sliding direction A. electric razor.