JPS61226083A - Production of inner blade for electric razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention c relates to a method of manufacturing an inner cutter for an electric razor using an ocellaminoku knife.

(Prior Art) An electric shaver, particularly a round-shaped inner cutter, is provided with a plurality of blade portions at predetermined intervals in the circumferential direction around the circumference H of a round-shaped rotated body.

FIGS. 12 to 15 also show a conventional method of manufacturing an inner cutter, and a description will be added below. Figures 12 to 14 show inner cutter blanks prepared through each process, and in the figure (
A) is an i17 side view of the inner cutter blank, and (I3) in the figure is a front view of - blade forming portions. Moreover, FIG. 15 is a side view of one blade forming part.

First, a flat inner cutter blank 50 shown in FIG. 12 is punched out of a plate material (not shown). This inner blade blank 50 (1
It consists of a large number of blade forming parts 52 provided radially from the periphery x3 of the circular part 51, which is the same as the disc part 51.

Next, the tip half portion 52a of the blade forming portion 52 is
3Fl(n) does not show 31, radial direction in sea urchin press j 2 inclined tangent l,! 1, bend it to one side, and the bending angle (11 is close to approximately 90°. Also, at this time, the hole number of the hole 53... After this, the first root of the blade forming part 52 (13) in the same figure (
As shown in FIG. 14(B), the area near U11 is bent on the other side (aligned with half part 52a, warp 1 side) by approximately 90 degrees using a 61r press, and the hardness is made to be about 650 degrees with hinocurse hardness. Taha processing.

Then, such a blade forming portion 52 (FIG. 14(B)) is shown in FIG. 15 65' and 1. l. To slice the sea urchin along the horizontal line 122, grind LJ L/. If you apply a sharp knife and at the same time perform plane processing, the tip of the blade forming part 52 will be OK, and the blade part 54 will be formed at 1 (see Figure 11). ).

After this, the outer periphery i D formed by each blade part 54...
In order to make the inner periphery (¥[)1 (Fig. 11) into a perfect circle, the inside (center side) 54a of the blade portion 54 and the inner circumference (¥[)1] are made into a perfect circle. ．． full
The conventional inner cutter 60 is formed by polishing the inner cutter 54b and grinding the inner cutter 60.
It is known from Publication No. 81956, Registration No. 566625.

(Problems to be Solved by the Invention) However, the manufacturing method of the inner blade at the end of the Jt has the following problems.

First, it is impossible to use a ceramic sword, which has properties such as long life, high hardness, and inertness, which are attracting attention as a cutting blade. In other words, there are many bending processes, etc., and in addition, this inner cutting core has a complex shape and is small, making it difficult to manufacture under pressure.
The reality is that the Nicera Misoku blade cannot be used as the inner blade for electric or □mezari.

Secondly, there are many common problems in the manufacture of inner cutters in terms of the conventional inner cutter number of 1 or less.

(11) According to the so-called progressive press method adopted to reduce the cost I, there are many unnecessary parts in the grinder 1, the material efficiency increases, and the blade forming part 52 becomes smaller than the phase 71.
．． In addition, when the number of blades increases, the interval between the blade forming parts 52 on the inner blade blank 50 becomes narrower. A thin wall portion is created in the mold, which significantly shortens the length of the mold.

(2) It is necessary to bend the T-culm by pressing at least twice, and the formation position of each blade part 54 will vary due to the springback of the material. In addition, since the taha treatment is applied after the complicated bending process using a press,
Different heat treatment strains occur in each blade portion 54, and different strains also occur in the roll direction, so that the blade portions 54 cannot maintain a constant sharpness.

(3) Variation in the formation position of each blade portion 54, and! Since there are variations in the height of each forming part 52 due to distortion in the wafer processing,
It is necessary to grind many abrasives (Fig. 15 52b) to make all the blade surfaces flat in the same plane. Also,
As is clear from the plan view of the blade forming portion 52-11AI shown in FIG. 11, the inner blade 60 formed by the blade portion 54 in the same figure, i\D1 and 1 shape Do, is not a perfect circle 4 no 3. Therefore, a polishing step is required to align each blade portion 54. Moreover, since there are spaces between each blade part 54 and each blade part 54 has been heat-treated and becomes brittle, a lot of time is wasted in the polishing process.

(4) Although the blade forming portion 52 is bent by pressing, there are some unreasonable bending points, which weakens the mechanical strength. This causes problems such as easy breakage.

(5) As is clear from FIG. 11, since the tip of the half portion 52a of the blade forming portion having a relatively wide area is ground to form the blade portion 54, shaved beard, skin oil, etc. are removed from the half portion 52a. I ended up wearing a large amount of "I" on the back side. For this reason, it is difficult to remove, making cleaning difficult.

The present invention provides a method of manufacturing an inner cutter for an electric shaver that eliminates all such problems.

(Means to settle the issue) Misfire…0.1 Especially 1! Electric inner blade for mesori using Lamic Sogetsu! ! Regarding the i'J circulation method, its 9S features are +J, a molding process of forming a ring-shaped flat part 3 perpendicular to the axis on the periphery of the first transfer 2, and 1 on the flat surface 3.
Fix the IiIEI-shaped ceramic plate 7 -1! Bonding - includes a culm and a blade cutting process that forms blade grooves 15 inclined in the direction of rotation at predetermined intervals in the circumferential direction from the ceramic plate 7 to the rotated body 2 using a cutting length 23. It is at the point where it becomes.

(Embodiments) Below, preferred embodiments of the present invention will be described in detail based on the drawings.

First, the method for manufacturing the inner cutter for an electric shaver according to the present invention will be explained one by one for each step with reference to FIGS. 1 to 6. Figures 1 to 3, Figures 5 and 6 show the inner cutting board made by each culm, and Figure 4 shows the ceramic plate.In each figure, (Δ ) is a front half-cut sectional view, ([3)
is a bottom view.

[Molding process] Molding process (consists of primary process)

(Mold I Cutting Step) First, in the die cutting step, the bowl-shaped inner cutter blank 10 shown in FIG. 1 is also cut out from the plate +2 (not shown).

Inner cutter blank Loll:P]l&portion 10a, and a cylindrical portion 1 extending a predetermined length from the periphery of the disc portion]Oa in the axial direction.
Consists of 0b. At the top of this mold, the disc part]
I&(=J hole 2) drilled at the center of Oa and around the center
0 and the discharge hole 21... are also punched out at the same time.

(Drawing process) Next, as shown in Fig. 2, the above blank 1oo) cylindrical part 1 (lb) is squeezed with a press to form a small cylindrical part 12 with a small size of 1 yen, and at the same time the open [ ] end A flange-shaped ring plate portion 13 is formed which is bent outward in the radial direction from the peripheral edge.The width 1,1 of this ring plate portion 13 is the width of the blade portion 5. Therefore, the width number of the blade portion 5: 1 The size can be selected depending on the size of the cylindrical portion 101) which is reduced by the aperture.

[Second drawing upper stage] Next, as shown in FIG.
The a side is further narrowed down to a small size (¥) to form the second small cylindrical portion 22. Note that this second diaphragm - By doing so, the downward movement of the shaved beard (1) can be made smoother.

[Ceramic board adhesion process]

On the other hand, a ring-shaped ceramic plate 7 shown in FIG. 4 is prepared. The thickness of this ceramic piece 7 is about 0.2 mm, and the outer diameter and inner diameter of the ring are set to the outer diameter and inner diameter of the ring plate portion 13, respectively.

Then, as shown in FIG. 5, the ceramic plate 7 is bonded to the plate surface 14 of the ring plate portion 13 via an adhesive.

[Blade cutting process]

As shown in FIG. 6, the inner blade blank 1o that has undergone the polishing process is polished by a grinding tool 23 such as a disc-shaped rotary whetstone with a rounded surface (for example, a Diamond I whetstone).
j15... is formed. This blade groove 15 is formed in a notch shape from the plate surface of the ceramic plate 7 to the ring plate part 13 and further to the small cylinder part 12, and this blade groove 15 is formed at the boundary between the small cylinder part 12 and the second small cylinder part 22. Cut until the end. Blade groove 15 (grinding tool 2
3) is inclined at a predetermined angle in the direction of rotation of the inner cutter, and as shown in FIG. 6, this inclination angle θ1 is optimally about 25° to 35°.

Further, the blade groove 15 (grinding tool 23) is slightly inclined with respect to the radial direction. As shown in FIG. 10, this inclination angle θ2 is optimally approximately 12°, which is created by cutting the outer cutter to create an intersecting angle.

If the retaining member 31 that engages with the drive pole (not shown) is attached to the hole 20 of the inner cutter main body 30 processed through the above steps, the inner cutter body 30 (not shown in FIGS. 10 and 11) will be removed. Blade 1
complete.

Next, the inner cutter l manufactured by such a manufacturing method will be explained with reference to FIGS. 7, 8, 10, and 11. FIG. 7 is a plan view showing one blade portion of the inner cutter, FIG. 8 is a front view showing the same blade portion, and FIG. 10 is a plan view of the inner cutter for an electric shaver manufactured by the manufacturing method according to the present invention. FIG. 11 is a front half-cut sectional view of the same inner cutter.

Inner cutter 1 +; I includes a bowl-shaped base 10c in which the circle (L part] (L a and this disc part] from the circumference of Oa to the cylindrical part 10) extends a predetermined length in the axial direction, The base portion 10c is integrally formed with a plurality of extending portions 4 that protrude in the axial direction on the periphery of the base portion 10c. It extends in the direction of rotation, and each extension part No. 4: 1 has a chevron-like shape on the tip side, and extends into a staircase.

・The tip of the second extension part 4... has a horizontal part 9 projecting outward in the latitudinal direction, and a ceramic blade 6 is mounted on the upper surface of the horizontal part 9. It will be integrated into one. This ceramic blade 6 has a blade portion 5 at the front end 1 in one rotational direction.

Horizontal part 9 and t! The vertical cross-section of the lamic sword 6 in the longitudinal direction is approximately a parallelogram as shown in FIGS. 8 and 11, and the planar shape is a trapezoid as shown in FIG.

Although Embodiment I-1 has been described in detail below, the present invention is not limited to this embodiment. For example, the second drawing process may or may not be provided, and a similar third drawing process may also be provided. Moreover, the selection of the magnitudes of angles θ1 and θ2, and the magnitude of 1 are arbitrary.

Furthermore, the present invention can be used by forming individual ceramic blades 6 in advance as shown in FIG. In addition, although it was applied to the inner cutter 7, the outer cutter may be constructed by, for example, adhering the ceramic plate 7 to the back surface of the outer cutter and grinding it. It can be applied and configured.Furthermore, the shape, composition, quantity of details,
Any modifications in size etc. that do not depart from the gist of the invention are permitted within the scope of the invention.

(Results of the Invention) As described above, the method for manufacturing an inner cutter for an electric shaver according to the present invention includes a forming step of forming a ring-shaped 1F river surface perpendicular to the axis on the periphery of a rotated body, and Fix a flat ceramic plate to -1! The ceramic plate and the rotated object are moved in the direction of rotation through the adhesion process and the cutting process.
The blade height is formed at predetermined intervals in the circumferential direction.

First, it is possible to use a ceramic blade, which is an excellent material for cutting and folding knives, and it is extremely easy to manufacture and process. Therefore, it is possible to manufacture an inner blade that has the various properties of a ceramic blade, such as excellent sharpness due to high hardness, long life, and sluggishness.

Secondly, in addition to this result, many effects can be obtained from the viewpoint of the general inner cutter molding method as described below.

■The blade part of the inner cutter manufactured by the manufacturing method according to the present invention shown in Fig. 10 and the blade part of the inner cutter according to the conventional example shown in Fig. 9 (
As is clear from the comparison of the blade forming part), the blade part number of the inner blade according to the method of the present invention is formed into a horizontal part with a relatively small area of the Mii surface protruding outward by the optimal embodiment. , it becomes difficult to adhere to shaved beards, dish parts, single-use parts, and horizontal parts.

Therefore, 'tN removal of the inner cutter becomes extremely easy.

In addition, the horizontal part protrudes outward compared to the extended part, and the extended part extends outward in a step-like manner. It is discharged through the groove to the lower part of the inner blade.

■There is a cylindrical part on the outside to form the base into a bowl shape. Therefore, the power distribution is biased to the outside compared to the conventional one, and the inertial force is increased, so that fluctuations in rotational speed due to temporary loads are reduced, and stable performance can be achieved.

■The extension part is erected from the periphery of the cylindrical part that exists outside the base.
- The length of the extension part can be made as short as possible, and there is no need to bend it at the base as in the conventional case. Therefore, the mechanical strength can be increased, and stable performance can be maintained even under temporary loads such as in a double series.

■The inner blade blank is shaped like a bowl, so the shape is academically refined.
The cost of press molds can be significantly reduced and the lifespan can be extended. Furthermore, automatic payment using a parts feeder or the like becomes easy.

■Simplification of the shape of the inner cutter blank reduces shape distortion during pressing, and also has the same springback technology as the conventional one:
/L, it is possible to add high viscosity.

This allows constant sharpness to be maintained at all times. In particular, if the pressing distance is 1 tijt for the cross-cutting edge of the blade, it will vary within an angle of 0 to 20°.
In Lee Gwangmyeong, this variation is incredible.

■Since the ring plate part is formed by pressing, the plate surface of the ring plate part can be easily flattened. Therefore, surface finishing can be easily done by automatic polishing, and rilF
The H+ cost is also small, and the l'riJF If time is also extremely small. Moreover, since the shape is highly precise, post-processing such as 1iJI polishing to correct irregularities in each blade part is unnecessary, and the polishing process can be significantly streamlined.

(2) With the conventional press force type, the number of teeth is limited to about 16, but with the inner cutter of the present invention, by reducing the thickness of the grinding tool, the number of teeth can be increased to about 32.

[Brief explanation of the drawing]

FIGS. 1 to 3, FIGS. 5 and 6 (: 1 each for manufacturing the inner cutter for an electric shaver according to the present invention) and the inner cutter blank manufactured by the steps shown in FIG. 4. (A) is a front half-cut sectional view, (3) is a bottom view, FIG. 7 is a plan view showing the outer edge of the inner blade, and FIG.
Figure IJ is a front view of the same blade 811, Figure 9 is a front view showing one blade part of the inner cutter for an electric shaver according to the conventional example, and Figure 10 is a front view of the electric shaver manufactured by the manufacturing method according to the present invention. Fig. 11 is a front half-cut sectional view of the inner cutter, and Figs. 12 to 14 show the inner cutter manufactured by each process of the conventional method for manufacturing the inner cutter for an electric shaver. The blade blank is shown, in which (A) is a plan view of the inner blade blank, (B) is a front view of - blade forming parts, and Fig. 15 is a diagram showing one blade formed on the inner blade blank. A side view of the section. In the drawings, 1... Inner blade for electric shaver, 2... Round rotated body, 3... Flat surface, 4... Extended portion, 5...
・Blade part, 6...Ceramic blade, 7...Ceramic plate.鑞 銖n 山くー郎 - fig.
Dimensions Heddle + Stainless Steel □n Q゛～---/ 1st 15 Figure 2 Figure (E) Figure 3 (B) b Soil Figure 4

Claims (1)

[Claims] 1. A method for manufacturing an inner cutter for an electric shaver, comprising the following steps. (a) A forming process of forming a ring-shaped flat surface perpendicular to the axis on the periphery of the rotated body, (b) An adhesion process of fixing a flat ceramic plate to the flat surface, (c) A cutting process to form a ceramic plate using a cutting tool. 2. A blade cutting step of forming blade grooves inclined in the rotational direction on the plate and the rotated body at predetermined intervals in the circumferential direction; 2. The forming step comprises the following steps: The method for manufacturing the inner blade for an electric shaver described above. (a) A die-cutting process in which a bowl-shaped inner cutter blank is extracted from a plate material, with a cylinder extending a predetermined length in the axial direction from the periphery of the disc; (b) A small cylinder having a smaller diameter by narrowing the cylinder. and a drawing step of forming a ring plate portion having the flat surface by bending it radially outward from the periphery of the opening end;