WO2013021514A1

WO2013021514A1 - Rotary shaver, manufacturing method for outer blade thereof, and outer blade

Info

Publication number: WO2013021514A1
Application number: PCT/JP2011/077198
Authority: WO
Inventors: 三村良幸
Original assignee: 株式会社泉精器製作所
Priority date: 2011-08-09
Filing date: 2011-11-25
Publication date: 2013-02-14
Also published as: JP2014198059A

Abstract

A rotary shaver, which is equipped with an outer blade in which multiple beard-accepting holes are formed in the shaving surfaces that form ring-shaped protrusions and an inner blade that rotates in contact with ring-shaped shaving grooves of the lower surface of the outer blade, and which cuts hair that enters the beard-accepting holes of the outer blade using the inner blade. The outer blade is formed into the disc-shaped outer blade shape by machining beard-accepting holes in a metal sheet and drawing the metal sheet. Deep drawing of the metal sheet is not always required, the use of special drawing molds, cutting, or difficult machining methods such as ECM or electric discharge machining is not necessary, and productivity can be significantly improved. The machined shape of the beard-accepting holes is not limited to straight lines, making it possible to increase the degree of freedom in designing the shaving surface. The rotary shaver is also suitable for reducing the weight thereof.

Description

Rotary shaver, method of manufacturing outer blade thereof and outer blade

According to the present invention, a large number of eyebrow introduction holes are formed in the annularly-raised shaving surface of the outer blade, and the eyebrows entering this eyelid introduction hole are rotated in contact with the annular shaving groove on the lower surface of the outer blade. The present invention relates to a rotary shaver for cutting with a blade, a method of manufacturing an outer blade used therefor, and an outer blade manufactured by this method.

As an outer blade used for this type of rotary shaver, one having a wedge introduction hole consisting of a slit radially crossing an annular shaving surface is known. It is also known to have a weir introduction hole consisting of small holes.

For the outer blade having a slit, an annular dividing groove is provided between a plurality of annular (ring-like) shaving surfaces, and the slit extending to the inner and outer radius shaving surfaces including this dividing groove is What is provided is disclosed in Patent Document 1. Since the slits connect the slits of the adjacent shaving surface with the slits of the dividing grooves, it is difficult for the cutting grooves and fat secreted from the skin to be accumulated in the dividing grooves. Patent Document 1 also discloses that the strength of the shaving surface is secured by leaving the connecting portion at a part of the bottom of the dividing groove and the like.

Patent Documents 1 and 2 disclose a method of manufacturing such an outer blade. That is, a rotary cutter (or rotary grindstone) is applied to the outer shaving surface to process a slit, and an inner dividing groove of the shaving surface and the shaving surface are applied to the rotary cutter to sequentially form slits in these It is. Such processing can be performed by changing the position of the rotation center of the rotary cutter. The number of slits is therefore usually greater with the outer shaving surface. Because the radius of the outer shaving surface is larger than the inner shaving surface, the area of the shaving surface is increased.

The outer blade having these slits is also referred to as a rough cutting blade or a rough cutting rotary blade because it is easy to introduce a long wrinkle or a wrinkle with a wrinkle into the slit. However, the skin easily penetrates deep into the slit in the longitudinal direction, and when the outer blade is brought into strong contact with the skin, the skin approaches the inner blade, leaving a tingling sensation after shaving and a bad shave taste There is a problem of For this reason, there is also a slit in which the thickness of the shaving surface is increased to prevent the skin from approaching the inner blade (Patent Document 6).

It is also known that, in place of the slit, a circular and small diameter small hole introduction hole formed in a part of an annular shaving surface. Patent documents 3, 4, and 5 show that a slit and a small hole are divided into the same annular shaving surface. Patent Document 3 describes thickening the slit area to make it difficult for the inner blade to contact the skin even if the skin enters the slit, while thinning the area of the small hole to finish shaving. That is, the area of the small hole is a finishing rotary blade. However, although these Patent Documents 3, 4 and 5 do not describe a method of manufacturing the outer blade thus having the slit and small hole areas formed in the common annular shaving surface, the actual manufacture is considerably complicated. I think it will be.

That is, the conventional outer cutter is usually machined by ECM (electrolytic machining method), electric discharge machining method or the like. The outer blade is formed by pressing a metal plate (thin metal plate, blank) sufficiently thicker than the thickness of the shaving surface to a predetermined outer blade shape (circular substantially inverted plate shape), and then the inner blade runs on the inner surface Grind the moving surface (annular shaving groove, track). After this is hardened, slits and small holes are machined by ECM (electrolytic machining method) or electric discharge machining.

Japanese Patent Laid-Open No. 6-7555 U.S. Pat. No. 5,427,001 Japanese Patent Application Publication No. 2006-510430 Japanese Patent Publication No. 2004-515283 EP 0 925 158 A1 Unexamined-Japanese-Patent No. 11-4980

As a method of manufacturing an outer blade for a rough shaving rotary blade having a conventional slit, in a method which is apparent from the drawings of Patent Documents 1 and 2, first, a metal plate of appropriate thickness is pressed outside a shaving surface. The part is deep drawn (this state is also called a deep drawn product or work). At this time, the dividing grooves are also drawn simultaneously. Then, this deep-drawing product is ground to reduce the thickness of the shaving surface, and then the slit is processed with a rotary cutter, and finally, burrs generated with the processing of the slit are removed or The polishing process was performed.

11 is a plan view showing an example of a conventional outer blade having such a slit, FIG. 13 is a cross-sectional view along the line XIII-XIII, FIG. 5 (B) is an enlarged side cross-sectional view thereof, and FIG. It is. The conventional outer cutter 10 shown here is manufactured conventionally by the applicant, and as shown in FIG. 13, for example, a metal plate of 0.5 to 0.6 mm (metal thick plate, blank) Is deep drawn by a press (steps S100 and S102 in FIG. 14), and the shaving surface 14 (the outer circumferential shaving surface 14a and the inner circumferential shaving surface 14b) on both sides (the outer circumferential side and the inner circumferential side) of the dividing groove 12 ), And these shaving surfaces 14 are thinned to a thickness of 0.08 mm by grinding (lace processing) (step S104). After quenching (step S106), the slit 16 (16a, 16b) with a width of 0.26 to 0.3 mm is cut into a linear shape by a rotary cutter (step S108), and burrs generated by this cutting are removed It is removing (step S110).

The use of a metal plate of 0.5 to 0.6 mm means that the machined surface (shaved surface 14) is fixed when grinding the razor surface (step S104) or when processing the slit 16 with a rotary cutter (step S108) This is because the strength needs to be high. In addition, since it is necessary to hold the outer peripheral flange portion 18 of a deep-drawn metal plate workpiece (workpiece) between jigs (not shown) and hold it (wrinkle pressing), the die and punch drawing types are complicated. become. In order to avoid interference between the jig and the rotary cutter, it is necessary to make the distance between the flange portion 18 and the shaving surface 14 sufficiently large. For this reason, it is necessary to deep-draw the metal plate to elevate the outer cylindrical vertical wall 20 of the shaving surface 14. Since the fixed strength of the shaving surface 14 is reduced as the vertical wall 20 becomes higher, it is necessary to make the metal plate thick enough to have sufficient strength and rigidity.

Therefore, it is necessary to use a material which can be deep drawn, for example, a soft one having a Vickers hardness (HV) of 200 or less or a material having a large elongation. Further, heat treatment is required to increase the strength before processing by the slit cutter (step S106 in FIG. 14), and deburring processing that accompanies slit processing is also required (step 110). There is a problem that In addition, various methods are considered for manufacture of an outer blade. For example, after deep drawing, processing of the outer surface and the inner surface of the shaving surface is performed by lace processing (cutting, grinding processing) or electric discharge processing, and processing of the slit is ECM processing (electrolytic processing, electro- Although it is conceivable to use chemical machining, electric discharge machining, etc., there is a problem that these machining steps are complicated and inefficient.

In addition, although a method for producing an outer blade having a small hole formed in an annular shaving surface is not disclosed in the above-mentioned Patent Documents 3 to 5, the above-mentioned electric discharge machining when using a conventional production method, It is considered that ECM or the like is used. However, these have the problem of being inefficient as described above.

As described above, since it is necessary to deep-draw the metal plate in the conventional manufacturing method, it is necessary to use a material which can be deep-drawn and soft and stretchable, and the thickness of the shaving surface is reduced in the deep-drawn material When processing slits (such as grinding) and then processing slits or small holes, it is necessary to carry out heat treatment in order to harden the material (provide rigidity). In addition, it was necessary to use a thick material to have rigidity suitable for processing. In particular, when using a rotary cutter for slit processing, it is possible to only process the slit in a straight line, and it is conceivable to use ECM, electric discharge machining, etc. for slit processing or processing for thinning a shaving surface. Equipment is required and productivity is reduced. . Therefore, there has been a problem that the manufacturing process becomes complicated and the productivity is deteriorated.

The present invention has been made in view of these circumstances, and there is no need to deep-draw the metal plate, and there is no need to use special drawing methods or complicated processing methods such as cutting, ECM, electric discharge processing etc. Productivity It is possible to significantly improve the shape of the slit and to increase the degree of freedom in shaving surface design without being limited to a linear processing shape, and to provide a rotary shaver that is also suitable for weight reduction. The purpose of Another object of the present invention is to provide a method of manufacturing an outer blade used for this. Furthermore, it is a third object to provide an outer cutter manufactured by this method.

According to the present invention, the first object is to rotate the outer blade having a large number of eyebrow introduction holes formed in the toroidal-raised shaving surface, and the inner blade that contacts and rotates the annular shaving groove on the lower surface of the outer blade. The rotary shaver is provided with a blade, and the inner blade is cut by an inner blade into the outer edge of the outer blade, wherein the outer blade is formed of a thin metal plate into which the thin plate introduction hole is machined. This is achieved by a rotary shaver characterized in that it is molded into a disk-like outer blade shape.

Further, according to the present invention, a second object is a method of manufacturing an outer blade used in a rotary shaver according to claim 1,
a) machining a large number of the weir introduction holes penetrating the shaving surface into a flat sheet metal sheet;
b) processing the sheet metal into a disk-like outer cutter shape by drawing;
According to another aspect of the present invention, there is provided a method of manufacturing an outer blade of a rotary shaver characterized by the following.

Further, according to the present invention, a third object is to form a large number of wedge introduction holes in at least a part of a toroidally raised shaving surface, and to rotate in contact with the toroidal shaving groove on the lower surface of the outer blade. In an outer blade used for a rotary shaver that cuts a wedge entering the wedge introduction hole by an inner blade,
The wedge introduction hole is achieved by the outer blade of the rotary shaver which is formed into a disk-like outer blade shape by drawing of a stamped metal sheet.

Since a chisel introduction hole consisting of slits and small holes is formed in advance by press punching on a thin metal plate, and this processed thin metal plate is processed into an outer edge shape by drawing, as in the case of using a thick metal material (metal plate) There is no need to always do deep-drawing. That is, as in the conventional method, in the case where the shaving introduction surface is processed after pressing the shaving surface, the work must be held with a jig because it is necessary to thin the shaving surface before processing the chewing introduction hole. It is necessary to separate the shaving surface from the holding surface of the jig. For this reason, since it becomes necessary to raise the cylindrical vertical wall of the shaving surface outer periphery, it is necessary to carry out deep drawing. In this case, it is necessary to use a material with good drawing processability and soft elongation for deep drawing, and then it is necessary to increase the rigidity of the work by quenching to machine slits and small holes in this material Will occur. This requires the use of thick materials. On the other hand, according to the present invention, it is not always necessary to perform deep drawing, heat treatment (quenching) and deburring, and the processability is improved.

When machining a thin shaving surface, it is necessary to use a thick material to ensure material strength, and when using a thick material, the shaving surface should be thinned after slitting or small holes. In order to machine, it is necessary to carry out heat treatment to increase rigidity, which complicates the processing steps and lowers productivity, but according to the present invention, since a thin material can be used from the beginning, the slits It is easy to process small holes, and it is not necessary to perform heat treatment before this processing, and productivity can be greatly improved. For example, it can process efficiently by press punching and etching. In addition, since a rotary cutter is not used for processing the slit and the small hole, there is no need to limit the processing shape of the slit to a linear shape, and the design freedom of the shaving surface can be increased. In addition, since thin materials are used, it is also suitable for reducing the weight of the outer cutter.

Front view of a rotary shaver according to an embodiment of the present invention Top view of the outer blade of the rotary shaver in Figure 1 III-III sectional view of FIG. 2 Top view of a sheet metal machined with slits It is an expanded side sectional view of an outer blade, and (A) shows the example of the present invention, and (B) shows a conventional example. FIG. 5 is a view showing the manufacturing process of the outer cutter according to one embodiment of the present invention. Top view of sheet metal showing another embodiment of the slit Top view of the outer cutter according to another embodiment of the present invention Top view of outer cutter according to still another embodiment of the present invention The perspective view which shows the Example which integrally molded the outer blade and the resin ring Side cross-sectional view of the embodiment of FIG. Top view of conventional outer cutter The XIII-XIII line sectional view in FIG. 12 Diagram showing the manufacturing process of the conventional outer cutter

The chewing introduction hole may be a large number of slits extending to the inner and outer circumferential sides of the shaving surface, and the shaving surface on which the slits are formed may form a rough shaving rotary blade. Further, the chewing introduction hole may be a large number of small holes formed in at least a part of the shaving surface, and the shaving surface on which the small holes are formed may form a finishing rotary blade. The annular shaving surface forming the slit and the annular shaving surface forming the small hole can be divided into separate annular shaving surfaces, for example, a plurality of shaving surfaces are provided concentrically, and the rough shaving blade of the slit The shaving blade on the small hole can be made into the shaving surface on the inner circumferential side. Further, a partial area of the common annular shaving surface may be a rough shaving blade of a slit, and the remaining area may be a finishing blade of a small hole.

The thin metal sheet can be formed by press punching the slit so that the thickness does not exceed the width of the slit. The sheet metal may have a thickness not exceeding the width or diameter of the small holes, and the small holes may be formed by press punching. In these cases, the wedge introduction hole can be formed extremely efficiently by press punching, and the manufacturing efficiency is remarkably improved.

It is also possible to separately hold the finishing rotary blade in which a small diameter hole introduction hole is formed in a common outer blade case and the rough shaving rotary blade in which a slit is formed. In this case, for example, a finishing rotary blade is disposed on the near side (front side of the main body) of the user, and a rough cutting rotary blade is disposed on the side far from the user (back side of the main body) Each blade can be distributed back and forth. When the finishing rotary blade is placed on the front side, when the outer blade case is placed on the skin surface and slid vertically, the contact angle of the outer blade to the skin is the user's finishing blade, that is, the finishing blade It can be adjusted by inclining it with the fulcrum as a fulcrum, in which case there is no risk of damaging the skin even if the contact pressure of the finishing blade is increased.

According to the outer blade manufacturing method of the present invention, after processing a large number of punch-introducing holes penetrating the shaving surface into a flat metal plate, it is processed into a disk-like outer blade shape by drawing. The manufacturing process is much simpler than the conventional method.

In this case, the thin metal sheet used in the step a) may be made of a material having a large elongation corresponding to the drawing at the time of drawing as a thickness not exceeding the width of the crucible introduction hole. For example, a material capable of elongation of 10% or more is suitable, although it depends on the amount of reduction (the reduction ratio or the reduction ratio). In step b), at least the outer periphery can be shallow drawn using a conical die. That is, the angle between the shaving surface and the outer peripheral surface can be larger than 90 degrees (right angle), for example, about 100 degrees or 100 degrees or more. If processing can be performed by such shallow drawing, processing defects are less likely to occur in the material during press forming, and processing yield is improved. That is, at the time of deep drawing, the material plate placed on the die is punched by using a punch. At this time, since the material plate is drawn into the die, a large circumferential compression pressure is applied near the outer periphery of the material plate. For this reason, wrinkles are easily generated near the outer periphery. However, if the aperture is made shallow, this haze will not easily occur.

In addition, when processing the sheet metal in step a), a hole is made in the center, and in step b), if a hole widening process is performed in which drawing is performed so as to widen the hole, wrinkles are further increased. It is hard to occur and smooth draw molding becomes possible. That is, as described above, in deep drawing, since drawing is mainly performed by drawing in material from the die surface (flange portion), wrinkles are easily generated in the drawn surface, and for this reason, a drawing die for pressing the flange part is required. According to the spreading process, the material is formed mainly by the outflow of the material from the bottom of the punch, and it is bulged.

As the thin metal plate, one having a hardness of HV 400 or more can be used, and in this case, it is not always necessary to perform heat treatment after the processing of the outer blade, thereby improving the productivity. Note that heat treatment may be performed after the outer blade processing, in which case the hardness of the outer blade is significantly increased, and the durability is improved. Hardness having a hardness of HV400 or less (for example, around HV200 or less) can be used. In this case, the drawability is improved, but in order to increase the hardness, heat treatment is preferably performed.

In order to process slits or small holes in step a), press punching is suitable, and in this case, the productivity is significantly improved. However, instead of the press punching process, the slit can be processed by etching. In this case, since the metal material is thin, the processing time can be shortened and the productivity can be improved. The slit may be processed by laser processing. Alternatively, the slitting process of step a) may be performed by press punching, and steps a) and b) may be performed stepwise by the same drawing die. In this case, as a drawing type, a division type in which a portion to be drawn is divided can be used.

The slits may be formed in a linear shape, but the width can be changed or bent in a curved shape by appropriately setting the shape of a press die or the like. When using etching instead of pressing, the pattern of the etching resist to be formed on the surface of the thin metal plate may be appropriately determined.

The outer periphery of the outer blade can be inserted into a resin ring and molded. That is, since the outer blade is formed by processing a thin metal plate, the rigidity of the whole may be insufficient. Therefore, if the outer periphery is inserted into a resin ring and molded (insert molding), the strength of the outer blade, The rigidity can be improved, and the handling of the outer cutter can be facilitated. This effect is particularly effective when the outer peripheral edge of the outer cutter is made shallow. The ring may be a skin protection ring, in which case the skin protection ring may prevent excessive penetration of the skin into the slit when the outer blade is pressed firmly against the skin.

1 is a front view of a rotary shaver according to an embodiment of the present invention, FIG. 2 is a plan view of its outer blade, FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 5A is a plan view, FIG. 5A is an enlarged cross-sectional view of an outer blade according to the present invention, and FIG. 6 is a view showing a manufacturing process of the outer blade according to an embodiment of the present invention.

In FIG. 1, reference numeral 50 denotes a main body portion of the rotary shaver, and 52 denotes a head portion thereof, and the head portion 52 is disposed such that centers of three outer cutters 54 are positioned at apexes of an equilateral triangle. An inner blade (not shown) slidably pressed on the lower surface of each outer blade 54 is accommodated in the head portion 52, and each inner blade is rotationally driven by an electric motor accommodated in the main body 50.

The outer blade 54 is obtained by processing a thin metal plate 56 having a thickness of 0.08 mm, as apparent from FIGS. 3 and 5A. That is, a metal sheet (blank) 56 having the same thickness as the shaving surface 58 (the outer shaving surface 58a and the inner shaving surface 58b) is prepared (FIG. 6, step S200) and processed. In the thin metal plate 56, as shown in FIG. 4, the radial slits 60 (60a, 60b) and the central hole 61 are press punched (step S202).

Here, the width of the slit 60 is larger than the thickness of the thin metal plate 56, which is convenient for punching the slit 60. Since the thin metal plate 56 is sufficiently thin, the processing accuracy for punching the slit 60 is high, and the reliability is high. Therefore, the hardness of the thin metal plate 56 can be increased. Further, an annular portion 62 in which the slit 60 is not formed is left between the

slits

60a and 60b.

Next, the thin metal plate 56 is drawn into an outer blade 54 (step S204). This squeezing is a shallow squeezing in which the depth of the formed portion is not so deep, and the overhanging process formed by the material flowing out from the bottom portion to the side wall around it, pre-piercing the bottom portion This process includes an expanding process of forming the hole in such a manner as to expand the hole. In this shallow drawing, the annular portion 62 between the two

shaving surfaces

58a and 58b is pressed in a groove shape to form an annular groove 64, and the outside of the outer shaving surface 58a is shown in FIG. 5 (A). As shown, the tapered stop surface 66 has a gentle slope with respect to the external shaving surface 58a. On the other hand, although the inner peripheral side of the inner shaving surface 58b is drawn substantially vertically, this drawing is shallow and therefore does not become deep drawing. An opening 61a in which the hole 61 is enlarged is formed in the inner drawn portion, and a cap (not shown) for pivotally supporting the center of the inner blade is fixed to the opening 61a. The back surfaces of the shaving surfaces 58a and 58b constitute annular shaving surfaces 59a and 59b, and serve as sliding surfaces (tracks) on which the rotating inner blade contacts and travels.

As described above, since the outer blade 54 can be formed by shallow drawing, the inconvenience is eliminated even if the hardness of the thin metal plate 56 is high, and the outer blade 54 can be processed. If the hardness of the thin metal plate 56 is insufficient (for example, in the case of HV 400 or less) or to further improve the durability of the outer blade 54, it is preferable to further heat treat the shallow drawn material (step S206). If the shaving surface 58 or the inner blade sliding surface which is the lower surface of the shaving surface 58 is further polished, the sliding with the skin becomes better when shaving, and the rotation of the inner blade becomes smooth and the sharpness of the eyebrows is improved. It is possible to expect work hardening or strain hardening of the thin metal plate 56 by drawing, and it is also possible to increase the surface hardness of the outer cutter 54 by this hardening.

FIG. 7 is a plan view of sheet metal blanks (blanks) 56A and 56B showing a modification of the slit processed in step a) (step S204). The thin metal plate 56A of FIG. 6A is obtained by curving the slit 60A in an arc shape. The thin metal plate 56B in FIG. 7B is the one in which the width of the slit 60B is changed in the length direction. These

slits

60A, 60B can be processed by press punching or etching.

FIG. 8 shows another embodiment of the wedge introduction hole of the outer cutter. The outer blade 54C of this embodiment has two concentric annular shaving surfaces 58c and 58d, and the outer and inner shaving surfaces 58c and 58d have a slit 60c and a small hole 60d in the circumferential direction as a weir introduction hole respectively. It is divided and formed. That is, the slits 60c are arranged to be divided into four in the circumferential direction, and the small holes 60d are arranged between the slits 60c.

According to this embodiment, by combining the rough shaving blade with the slit 60c and the finishing blade with the small hole 60d, it is possible to obtain a shaving speed and finish feeling suitable for the skin of the user. That is, by appropriately setting the combination ratio of the rough shaving blade and the finishing blade, it is possible to adjust the shaving speed and finish feeling to the user's preference.

FIG. 9 is a plan view of an outer blade 54D according to still another embodiment, in which two concentric shaving surfaces 58e and 58f are formed with a small hole 60e, respectively. . According to this embodiment, since both shaving

surfaces

58e and 58f serve as finishing blades, a rotary shaver suitable for skin which is weak or sensitive to shaving can be obtained. The outer blade 54D can also be used in combination with other outer blades, such as a rough shaving blade.

10 and 11 show still another embodiment. In this embodiment, for example, a resin ring 70 is formed by insert molding on the outer periphery of the outer blade 54 shown in FIGS. 2 and 3 and the outer blade 54 and the ring 70 are integrated. Since the outer cutter 54 is made of sheet metal, the overall rigidity may be insufficient. Therefore, in this embodiment, the ring 70 is fixed to the outer periphery of the outer blade 54 to increase the overall strength and rigidity.

The ring 70 is inserted from the rear (downward) into the outer blade insertion hole provided in the outer blade case 52a of the head portion 52 shown in FIG. 1 and is movable forward and backward (up and down) within a predetermined range and returns forward (upward) It is held possible. Here, the annular upper surface 68 of the ring 70 is slightly below and surrounds the outer shaving surface 58a. Therefore, when the outer blade 54 is strongly pressed against the skin, the outer side of the shaving surface 58a contacts the upper surface 68 of the ring 70, and the skin can be prevented from deeply entering the slit 60a of the shaving surface 58a and damaging the skin. .

50 Body 52

Head

54, 54C,

54D Outer blade

56, 56A, 56B Sheet metal (blank)
58 (58a, 58b, 58c, 58d, 58e, 58f) Shaving surface 60 (60a, 60b, 60c, 60A, 60B)

Slit

60d, 60e Small hole 61 hole 64 annular groove
70 plastic ring

Claims

An outer blade having a large number of eyebrow introduction holes formed in a toroidally-raised shaving surface, and an inner blade that rotates in contact with the annular shaving groove on the lower surface of the outer blade, and the blade introduction of the outer blade In a rotary shaver for cutting a weir entering a hole by the inner blade,
A rotary shaver characterized in that the outer blade is formed by processing the crucible introduction hole in a flat sheet metal sheet and drawing the sheet metal into a disk-shaped outer blade shape.
The rotary shaver according to claim 1, wherein the eyebrow introduction hole is a large number of slits extending to the inner peripheral side and the outer peripheral side of the shaving surface, and the shaving surface on which the slits are formed forms a rough shaving rotary blade.
The rotary shaver according to claim 1, wherein the eyebrow introduction hole is a plurality of small holes formed in at least a part of a shaving surface, and the small shaving surface formed with the small holes forms a finishing rotary blade.
The rotary shaver according to claim 2, wherein the thin metal plate has a thickness not exceeding the width of the slit, and the slit is formed by press punching.
The rotary shaver according to claim 3, wherein the thin metal plate has a thickness not exceeding the diameter of the small hole, and the small hole is formed by press punching.
A rough rotary for cutting with a plurality of outer cutters held by an outer cutter case, and a part of the outer cutters having a small hole. The rotary shaver according to claim 1, which is a blade.
The outer blade case is disposed on the upper portion of the main body housing the electric motor, the battery, and the control device, and the finishing rotary blade and the rough shaving rotary blade are distributed to the front and the rear of the outer blade case. A rotary shaver according to claim 6.
The rotary according to claim 1, wherein the slit and the small hole are formed on the common shaving surface, the formation range of the slit forms a rotary blade for rough cutting blade, and the formation range of the small hole forms a rotary blade for finishing blade. shaver.
The rotary shaver according to claim 1, wherein the outer blade is concentrically formed with a plurality of annular shaving surfaces, a part of the shaving surfaces is formed with slits, and the other shaving surfaces are formed with small holes.
A method of manufacturing an outer blade used in the rotary shaver according to claim 1, wherein
a) machining a large number of the weir introduction holes penetrating the shaving surface into a flat sheet metal sheet;
b) processing the sheet metal into a disk-like outer cutter shape by drawing;
A method of manufacturing an outer blade of a rotary shaver characterized in that.
The method for manufacturing an outer blade of a rotary shaver according to claim 10, wherein the thin metal plate used in the step a) has a thickness not exceeding the width of the crucible introduction hole, and is a material having a large elongation corresponding to the drawing at the drawing process.
The method according to claim 10, wherein in the drawing of step b), at least the outer periphery is shallow drawn using a conical die.
11. The method for manufacturing the outer edge of a rotary shaver according to claim 10, wherein a hole is formed in the center of the thin metal plate of step a), and in step b), a hole spreading process is performed to draw the hole in such a manner as to widen the hole.
The method according to claim 10, wherein the sheet metal used in step a) has a Vickers hardness of HV 400 or more.
The following steps after step b)
c) heat treating the sheet metal sheet drawn into a disk shape;
The method according to claim 10, further comprising:
The method for manufacturing an outer blade of a rotary shaver according to claim 10, wherein in the step a), the crucible introduction hole is processed by press punching.
The method for manufacturing an outer blade of a rotary shaver according to claim 10, wherein in the step a), the crucible introduction hole is processed by etching.
The method according to claim 10, wherein the steps a) and b) are processed stepwise using the same split drawing die.
At least a part of a toroidally-raised shaving surface is formed with a large number of wedge introduction holes, and the wedge introduction hole is formed by the inner blade rotating in contact with an annular shaving groove formed on the lower surface of the shaving surface. On the outer blade used for the rotary shaver to cut the weir entering the
An outer blade of a rotary shaver characterized in that a thin metal plate having a hole introduction hole formed therein is formed into a disk-like outer blade shape by drawing.
20. The outer blade of a rotary shaver according to claim 19, wherein the thickness of the sheet metal does not exceed the width of the crucible introduction hole.
20. The outer blade of a rotary shaver according to claim 19, wherein the wedge introduction hole includes a slit radially crossing the shaving surface and a small hole opening within the width of the shaving surface.
20. The outer blade of a rotary shaver according to claim 19, wherein the slits and the small holes are formed in the same shaving surface in a circumferential range.
20. The outer blade of a rotary shaver according to claim 19, wherein the slits and the small holes are separately formed on a plurality of concentric shaving surfaces.
22. The outer blade of a rotary shaver according to claim 21, wherein the slit has a non-linear shape or a shape in which the slit width changes in plan view.
20. The outer blade of a rotary shaver according to claim 19, wherein a resin ring is insert-molded and fixed on the outer periphery of the outer blade.