JP2979269B2 - Manufacturing method of inner blade of reciprocating electric razor - Google Patents

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 the manufacture of an inner blade of a reciprocating electric shaver having an outer blade having a curved surface curved along the reciprocating sliding direction of the inner blade.
About the method .

[0002]

2. Description of the Related Art As a reciprocating electric shaver having an outer blade of this kind, for example, as disclosed in Japanese Utility Model Laid-Open Publication No. 50-3788, the inner blade is an inner cutter of a normal reciprocating electric shaver. Reciprocates in an arc different from that which reciprocates linearly, but the configuration of this inner blade is a semi-circular small blade with the same radius, and a predetermined interval in the inner blade sliding direction with a dome-shaped inner blade holder. Many are arranged in parallel and buried.
According to this, the shape of the outer blade makes it easier to fit the outer blade even on a concave curved surface below the chin, and it is also easier to shave the beard at the location.

[0003]

However, in the above-mentioned conventional example, all the cutting edges of the plurality of small blades constituting the inner blade are embedded in the inner blade holder so as to be aligned along the concave curved inner surface of the outer blade. Is difficult. Also, it is not easy to grind each small blade. The present invention aims at simplifying the manufacturing of the inner blade 4 in the reciprocating electric shaver provided with the outer blade 2 having the curved surface curved along the sliding direction A of the inner blade 4 as described above. With the goal.

[0004]

SUMMARY OF THE INVENTION The present invention provides an inner blade sliding direction.
A along the inner surface of the outer blade 2 having a curved surface
The method of manufacturing the inner blade of the reciprocating electric shaver
There are, inner cutter 4 is made by arranging in parallel at predetermined intervals on the inner cutter sliding direction A of the cutter blades 7 of large number of disc-shaped inner cutter holder 9, the diameter of the cutter blades 7 outside Along the curved surface of the blade 2,
The small blades 7 at both ends in the inner blade sliding direction A have the smallest diameter, and the smaller blades 7 reaching the center in the inner blade sliding direction A gradually increase in diameter ,
Before each blade 7 is assembled to the inner blade holder 9,
And set a number of small blades 7 of the same diameter side by side
Then, after the blade is sharpened by centerless grinding, the inner blade holder 9
It is characterized by being assembled to

[0005]

Function Each of the small blades 7 has a different diameter but is all formed in a disk shape. Therefore, just aligning the centers of the respective small blades 7 and lining them up, all the blades are bent in the concave shape of the outer blade 2. They can be aligned along the inner surface. At the stage before assembling the inner blade 4, only the small blades 7 having the same diameter are laminated to form a cylindrical shape, so that the centerless polishing alone is sufficient and the blade can be easily attached.

[0006]

[Effect of the Invention] The inner cutter of a reciprocating electric shaver of the present invention
According to the manufacturing method , the inner cutter 4 along the concave curved inner surface of the outer cutter 2 having the curved surface curved along the sliding direction A of the inner cutter 4 can be easily manufactured.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a reciprocating electric shaver according to the present invention will be described with reference to FIGS. In FIG.
1 is a main body case, 2 is an outer blade detachably provided on the upper part of the main body case 1 with an outer blade holder 3, 4 is an inner blade, 5 is a drive rod which swings around a pivot 6 in the direction of arrow A. The inner blade 4 connected to the upper end of the driving rod 5 is reciprocally slid on the inner surface of the outer blade 2.

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

The inner blade 4 has a disk-shaped small blade 7 and an inner blade holder 9.
The small blades 7 are arranged in parallel at predetermined intervals in the inner blade sliding direction A, and the diameter of the small blades 7 is smallest at the small blades 7 at both ends in the inner blade sliding direction A. The diameter of the small blade 7 reaching the center of A gradually increases.

As shown in FIGS. 2 and 3, the inner blade holder 9 comprises two connecting pipes 10 and a spacer 11, and each small blade 7 has two holes 12, which are connected to each other. Tube 10
Through a spacer 11 so as to be arranged in parallel. The connecting pipe 10 is made of aluminum which is softer than the small blade 7,
It is made of a metal such as brass or stainless steel, and the inside of the hollow portion of the connecting pipe 10 is pushed by mechanically and hydraulically expanding means, for example, a vanishing rod B (see FIG. 3) as a mechanical means, so that the connecting pipe 10 has a diameter. The small blade 7 is fixed to the connecting pipe 10 by expanding the connecting pipe 10 into the small blade 7 by expanding in the direction. As described above, by passing the small blade 7 through the connecting pipe 10, the inner blade 4 can be obtained in which the blade edge is easily aligned along the concave curved inner surface of the outer blade 2. One or three or more connecting pipes 10 may be used, and may be set in consideration of the fixing strength, the pipe diameter, and the small blade diameter.

The small blades 7 having different diameters are quenched in a process before assembling to the inner blade holder 9 and then bladed. When the blades are bladed, as shown in FIG. The grinding wheel is set in a cylindrical shape by passing it through a grinding rod 13 and is subjected to centerless grinding as shown in FIG. 5. In this case, the grinding wheel is placed between a grinding wheel 14 and an adjusting wheel 15 which rotate in the same direction. By doing so, the blade can be easily formed.

FIG. 6 shows another embodiment.
The lower half is insert-molded in a plastic inner blade holder 9. In this case, since the small blade 7 is held inside the mold, the plastic inner blade holder 9 alone can be embedded and fixed at a predetermined interval without necessarily using the connecting pipe 10 and the spacer 11. In the above-described embodiment, the part that determines the pitch between the spacers 11 or the small blades 7 is
Irrespective of the diameter of the small blade, the length of the small blade 7 is different between the end portion and the center of the inner blade 4 because the size is the same from one end of the inner blade 4 to the entire length of the other end. In this case, the long hair is hard to be cut, and the blowing of the shavings becomes remarkable. On the contrary, in a large portion, the small blade 7 is easily bent, and the sharpness is reduced.
Further, the cutting edge is easily damaged. For this purpose, the diameter of the spacer 11 or the like may be made to correspond to the small blade diameter so that the amount of protrusion is substantially constant. In addition, when the spacer diameter at both ends of the inner cutter 4 is set to a value that is satisfactory for long hair cutting or shavings and is constant over the entire length, the plate thickness of the small blade 7 may be increased toward the center, or the same. It is also possible to use a small blade material having high strength even with a plate thickness, or to take measures for the small blade itself such as reinforcing ribs for increasing strength. The small blades 7 have the same diameter for a plurality of adjacent blades without changing the diameter sequentially for each of the small blades 7, change the diameter for each block, and polish the blades along the curved inner wall of the outer blade 2. By doing so, it can be easily made without increasing the polishing cost.

[Brief description of the drawings]

FIG. 1 is a front view showing a main part cut away.

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

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

FIG. 4 is a front view showing a state in which only small blades having the same diameter are set when performing the blade polishing.

FIG. 5 is a centerless polishing state diagram of a small blade.

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

[Explanation of symbols]

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

Claims (1)

(57) [Claims] An inner blade has a curved surface curved in a sliding direction A.
Reciprocating electric sliding back and forth along the inner surface of the outer blade 2
In the method for manufacturing a razor inner blade, the inner blade 4 includes a plurality of disk-shaped small blades 7 arranged in parallel on the inner blade holder 9 at predetermined intervals in the inner blade sliding direction A, The diameter of the small blade 7 is along the curved surface of the outer blade 2. The small blades 7 at both ends in the inner blade sliding direction A have the smallest diameter. Being big , each small blade 7
Are the same before assembling to the inner blade holder 9 respectively.
A number of small blades 7 having diameters are arranged side by side and set in a cylindrical shape.
After blade cutting by Thales polishing, assemble to inner blade holder 9
Reciprocating electric razor, characterized in that
Manufacturing method of inner blade.