JP2014113204A - Manufacturing method of outer blade of rotary type electric razor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method capable of easily and inexpensively forming an outer blade of a rotary type electric razor having a round hole-shaped whisker entrance port on an annular shaving surface to realize good feel to the skin.SOLUTION: There is provided a manufacturing method of an outer blade 10A of the rotary type electric razor 1 having the outer blade 10A and an inner blade 12A rotating while slidingly contacting an under surface of the outer blade 10A, having a plurality of concentric annular shaving surfaces 16A and 18A integrally formed on the outer blade 10A and the a round hole-shaped whisker entrance port 30 formed on at least one annular shaving surface 18A, and comprises (a) a process of grinding or polishing a predetermined position at which the round hole-shaped whisker entrance port 30 is formed in the annular shaving surface 18A so as to have a thickness dimension in a value smaller than an inner diameter dimension of a round hole 30 and (b) a process of forming the round hole-shaped whisker entrance port 30 by press work at a position where grinding or polishing is executed after the process (a).

Description

  The present invention relates to a method for manufacturing an outer blade of a rotary electric razor, and more particularly, to a method for manufacturing the outer blade in a rotary electric razor having a circular hole-shaped advance entrance on an annular shaving surface of the outer blade. .

  An outer blade having an annular shaving surface on the upper surface formed with a number of scoring entrances, and an inner blade having a small blade that rotates while sliding on the lower surface of the outer blade from below the shaving surface, There is known a rotary electric shaver in which a plurality of concentric annular shaving surfaces are integrally formed on the outer blade (see Patent Documents 1 and 2).

JP 2012-100728 A Special table 2010-528801

  Here, the outer blade of the rotary electric razor exemplified in Patent Document 1 has a configuration in which only slit-like striking entrances are arranged in parallel at a minute interval. There was a problem that there were few solid areas) and the touch was bad.

  On the other hand, the rotary electric razor outer blade exemplified in Patent Document 2 is provided with a round hole-like striking inlet in addition to the slit-like striking inlet, so that the effect of increasing the solid portion is also expected. obtain. However, conventionally, in order to manufacture an outer blade having such a round hole-shaped striking entrance, it is necessary to use an electric discharge machining method, an electrolytic machining method, a laser machining method, or an etching machining method. There has been a problem that the sophistication / complication is increased, the manufacturing process time is increased, and the manufacturing cost is increased.

  The present invention has been made in view of the above circumstances, and it is possible to easily and inexpensively form an outer blade of a rotary electric razor having a circular hole-shaped striation entrance on an annular shaving surface, and to be soft to the touch. It aims at providing the manufacturing method which can form a good outer blade.

  As an embodiment, the above-described problem is solved by a solution as disclosed below.

  According to the disclosed method for manufacturing an outer blade of a rotary electric shaver, an outer blade having an annular shaving surface formed with a number of screeding inlets on the upper surface, and a lower surface of the outer blade are slid from below the shaving surface. A plurality of concentric annular shaving surfaces are integrally formed on the outer blade, and at least one annular shaving surface has a round hole shape. A method of manufacturing the outer blade of a rotary electric shaver in which a striking entrance is formed, wherein: (a) a predetermined position at which the round hole-shaped scrambling entrance is formed on the annular shaving surface; A step of grinding or polishing so that the thickness is smaller than the inner diameter of the hole; (b) after the step (a), at the position where the grinding or polishing is performed by pressing Forming the round hole-like advancement inlet; And requirements to be obtained.

  According to the disclosed method for manufacturing an outer blade of a rotary electric razor, it is possible to easily and inexpensively form a round hole-like advance entrance on the annular shaving surface of the outer blade of the rotary electric razor. . Since the solid portion can be increased by forming a circular hole-like advance entrance on the annular shaving surface, it is possible to form an outer cutter with a good touch.

It is the schematic (perspective view) which shows the example of the rotary electric shaver which concerns on embodiment of this invention. FIG. 2 is a schematic view (plan view) showing an example of an outer blade of the rotary electric shaver shown in FIG. It is the schematic (side sectional drawing) which shows the example of the outer blade of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the manufacturing method of the outer blade of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the manufacturing method of the outer blade of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the manufacturing method of the outer blade of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the manufacturing method of the outer blade of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the manufacturing method of the outer blade of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the manufacturing method of the outer blade of the rotary electric shaver shown in FIG. It is explanatory drawing for demonstrating the manufacturing method of the outer blade of the rotary electric shaver shown in FIG. It is the schematic (plan view) which shows the other example of the outer blade of the rotary electric shaver which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view (schematic diagram) showing an example of a rotary electric razor 1 according to an embodiment of the present invention, and FIG. 2 is a plan view (schematic diagram) of an outer blade 10A of the rotary electric razor 1. FIG. 3 is a side sectional view (schematic diagram) of the outer blade 10A. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof may be omitted.

  As shown in FIGS. 1 to 3, the rotary electric shaver 1 according to the present embodiment has an outer blade 10 </ b> A having a shaving surface (annular shaving surface described later) formed with a number of scissors entrances on the upper surface, A rotary that has an inner blade 12A having a small blade that rotates while being in sliding contact with the lower surface of the shaving surface on the lower surface of the outer blade 10A, and that cuts the wrinkle that has entered the advancing entrance with the outer blade 10A and the inner blade 12A. Electric shaver. In addition, although the rotary electric shaver which has three combinations of outer blade 10A and inner blade 12A is mentioned as an example and demonstrated, it is not limited to this.

  In FIG. 1, reference numeral 50 denotes a main body portion having a case 54 in which an upper portion of a substantially cylindrical grip portion 52 is bent obliquely forward and upward. The case 54 is divided into front and rear parts, and a rechargeable battery, an electric motor, a control circuit board and the like (not shown) are accommodated therein. A power switch 56 is attached to the front surface of the case 54, and below the switch 56, a display unit (not shown) including an LED lamp that indicates a remaining charge amount of the battery, an operation state, and the like is provided.

  A head portion 58 is detachably attached to the upper portion of the case 54. The head portion 58 is inclined with respect to the grip portion 52 of the case 54 so that the shaving surface (the upper surface of a blade frame 60 described later) is directed obliquely upward. The electric motor has a rotation output shaft protruding from the upper surface of the case 54 toward the inside of the head portion 58, and rotationally drives the inner blade 12A. The contact pressure with respect to the lower surface of 24A shaving surface 14A, 16A is hold | maintained appropriately.

  The head portion 58 is obtained by assembling three sets of blade assemblies 62 to a blade frame 60 that is attached to the upper surface of the case 54 so as to be opened and closed. The blade frame 60 has a substantially triangular shape in plan view and has a shape in which the periphery is gently curved downward. Three circular attachment openings are formed in the blade frame 60, and each of the blade assemblies 62 can be tilted and held movably with a return habit upward.

  That is, the blade assembly 62 includes a substantially disc-shaped outer blade 10A whose periphery is bent downward, an outer blade rim 64 in which the outer periphery of the outer blade 10A is fitted (see FIG. 1), and the outer blade 10A. An inner blade 12A (see FIG. 3) that slides from below is provided. The inner blade 12A can be rotated by the blade assembly 62 and is held so as not to drop downward, and is rotationally driven by the electric motor as described above.

  Here, the outer blade 10A has a plurality of concentric annular shaving surfaces formed integrally. In the present embodiment, as shown in FIGS. 2 and 3, two (double) annular shaving surfaces 16A and 18A are located concentrically with the central axis 20A on the upper surface of the outer blade 10A, and between them. An annular groove 14A is formed. However, it is not limited to this structure, It is good also as a structure which has three or more annular shaving surfaces and two or more annular concave grooves (not shown).

  As an example, the annular shaving surfaces 16A, 18A are such that the inner annular shaving surface 18A is higher than the outer annular shaving surface 16A, ie, higher in height along the central axis 20A, and these annular shaving surfaces The surfaces 16A and 18A are configured to be positioned on a plane horizontal to the central axis 20A (see FIG. 3). However, it is not limited to this configuration, and the annular shaving surfaces 16A and 18A may be formed at the same height.

  The annular shaving surfaces 16 </ b> A and 18 </ b> A are formed with a large number of striking inlets, and the upper surface protrudes from the outer blade rim 64. In the present embodiment, a round hole-like advance entrance 30 (30a, 30b) and a slit-like advance entrance 32 are provided as the advance entrance. Here, the round hole-like striking inlet (round hole) 30 is not limited to a true circle, and includes other circles such as an ellipse. On the other hand, the slit-shaped advance entrance (slit) 32 is not limited to a rectangle, and includes other rectangles such as a trapezoid.

  More specifically, only the slit-shaped scooping entrance 32 is provided on the outermost annular shaving surface 16A. According to this, since the annular shaving surface 16A on the outermost circumference is responsible for the action of capturing and cutting the most wrinkles, by disposing only the slit-shaped scooping entrance 32 having a high effect of capturing wrinkles, It becomes possible to enhance the effect of catching and cutting the wrinkles.

  An annular shaving surface other than the outermost periphery (that is, the annular shaving surface 18A on the inner peripheral side in the present embodiment) is provided with a round hole-shaped scoring inlet 30 and a slit-shaped scoring inlet 32. In the present embodiment, a round hole forming region 31 including a predetermined number of round hole-shaped striking inlets 30 (30a, 30b) and a predetermined number of slit shapes along the circumferential direction of the annular shaving surface 18A on the inner peripheral side. The slit forming regions 33 made up of the sliding entrances 32 are alternately arranged. As an example, as shown in FIG. 2, three circular hole forming regions 31 and three slit forming regions 33 are alternately arranged on the inner circumferential side shaving surface 18 </ b> A. However, the configuration is not limited to this, and three or more, for example, five round hole forming regions 31 and five slit forming regions 33 are alternately arranged as shown in the modified example of FIG. It is good also as a structure. Further, the number of the round hole forming regions 31 and the slit forming regions 33 is not limited to the same number.

  While the slit-shaped scooping entrance 32 has a high effect of catching and cutting the scissors, there is a problem that the touch becomes worse. However, as in the present embodiment, only the slit-like scooping entrance 32 is provided on the outermost peripheral shaving surface 16A, and the round-hole scooping entrance 30 (30a, 30a, 30b) and the slit-shaped scooping entrance 32 are provided side by side, the area of the solid portion 34 can be increased without degrading the ability to catch the scissors, and a comfortable outer blade can be realized. it can. Furthermore, the configuration in which the round hole forming regions 31 and the slit forming regions 33 that are not present in the prior art are alternately arranged can improve the willingness to purchase by providing a novel design to the user.

  Here, the round hole-shaped striking entrance 30 has a zigzag shape in which the inner circumferential side round holes 30a and the outer circumferential side round holes 30b are alternately arranged along the circumferential direction of the annular shaving surface 18A. Formed. In the present embodiment, as shown in FIG. 2, in one round hole forming region 31, along the circumferential direction of the annular shaving surface 18A, a round hole-like progressive entrance (round hole on the outer peripheral side) 30b, Round hole-like advance entrance (inner circumferential side round hole) 30a, round hole-like advance entrance (round hole on the outer circumference side) 30b, round hole-like advance entrance (round hole on the inner circumference side) 30a, ... Formed so as to form a staggered pattern in which the inner peripheral round holes 30a and the outer peripheral round holes 30b are alternately arranged, such as a round hole-like striking inlet (outer peripheral round hole) 30b. Has been.

  According to this, it becomes possible to form the round hole-like striking entrance 30 (30a, 30b) by shear pressing which has been difficult until now. In other words, if the round hole-like striking inlets are arranged side by side on the same radius, the interval between adjacent round-hole-like striking inlets is set to a predetermined distance (for example, However, if the distance is set, the punch pins for the shear press process are too close to each other, and the pin diameter becomes too thin. Press working becomes difficult. On the other hand, as in the present embodiment, the inner circumferential side or the outer circumferential side is configured so that the inner circumferential side round holes 30a and the outer circumferential side round holes 30b are alternately arranged to form a staggered shape. A plurality of round holes arranged on one side (that is, only one of the inner peripheral side round hole 30a or the outer peripheral side round hole 30b in one round hole forming region 31) by one press. After carrying out the shear pressing process, a round hole arranged on the other side of the inner circumference side or the outer circumference side (that is, only the inner circumference side round hole 30a or the outer circumference side round hole 30b in one round hole formation region 31) Any one of the above may be employed in which a shearing press process is performed by a single press. According to this, a round hole-like striking inlet (inner peripheral side round hole) 30a and a round hole-like striking inlet (outer peripheral side round hole) 30b adjacent to each other in a staggered manner are separated by a predetermined distance (for example, separated from each other). The distance between the round hole-like striking inlets arranged on the same radius (the distance between one round hole 30a and the next round hole 30a, and The distance between one round hole 30b and the adjacent round hole 30b) can be separated to a distance that allows shear pressing (for example, a separation distance of about 0.3 to 0.4 [mm]). That is, regarding punches for forming the round hole-like striking entrances 30 (30a, 30b), two types of punches for inner peripheral side round hole processing and outer peripheral side round hole processing are prepared. The distance between adjacent pins on the same radius can be separated by a predetermined distance or more, and the pin diameter can be set to a predetermined thickness to ensure the strength. 30b) can be formed by shear pressing.

  On the other hand, as shown in FIG. 3, the inner blade 12A is integrally formed with a common metal plate 12B with small blades 22A and 24A that are in sliding contact with the lower surfaces (inner blade sliding surfaces) 16B and 18B of the shaving surfaces 16A and 18A. It is a thing. The small blades 22A and 24A are in sliding contact with the lower surfaces 16B and 18B whose upper edges are the inner blade sliding surfaces, respectively, so that the round hole-like striking inlet 30 (30a, 30b) and the slit-like striking inlet 32 are provided. Therefore, it is necessary to make the height of the upper edge coincide with the height of the inner blade sliding surfaces 16B and 18B and to improve the sharpness by polishing.

  Then, the manufacturing method of the outer blade of the rotary electric shaver 1 which concerns on this embodiment is demonstrated.

  First, as shown in FIG. 4, a stainless steel flat sheet material (thickness 0.6 [mm] as an example) is prepared, and a punch is applied to the surface side by shear pressing to form a disk having a predetermined outer diameter. The member 10Aa is punched. At the same time, the central opening 8 is formed by punching.

  Next, as shown in FIG. 5, the punched disk-shaped member 10Aa is subjected to a drawing press process to extrude the regions of the annular shaving surfaces 16A and 18A arranged in an annular shape, and the annular grooves 14A are formed. The three-dimensionally shaped member 10Ab is formed. The annular shaving surfaces 16A and 18A serve as so-called cutting edge portions. Note that the annular shaving surfaces 16A and 18A can be employed either when the upper surface height is the same or different.

  Here, at the same time as or after this drawing press work, a notch (hereinafter referred to as “D cut part”) 9 is formed on the outer peripheral edge at a predetermined position of the outer blade (three-dimensionally shaped member 10Ab) by punching. The D cut portion 9 is used as a position mark to be described later.

  Next, thinning processing is performed on the annular shaving surfaces 16A and 18A of the three-dimensionally shaped member 10Ab. More specifically, at this point, the portions that become the annular shaving surfaces 16A and 18A remain the thickness of the metal plate of the material (for example, a thickness of 0.6 [mm]). By grinding or polishing the portions to be 16A and 18A, the annular shaving surfaces 16A and 18A are thinned until a predetermined thickness is obtained. In the present embodiment, from an inner diameter dimension (as an example, an inner diameter of 0.3 to 0.6 [mm]) of a round hole-shaped striking inlet (described later) formed on the annular shaving surfaces 16A and 18A in a subsequent process. The annular shaving surfaces 16A and 18A are ground or polished so that the thickness dimension is smaller (as an example, the thickness is 0.2 [mm]). By providing this step, a round hole-like striking inlet having an inner diameter suitable for catching wrinkles (for example, an inner diameter of 0.3 to 0.6 [mm]) in the subsequent step is formed into an annular shaving surface 16A. , 18A can be formed by shear pressing. However, based on this thinning process, it is important to adopt a shear press working method described later.

  Here, as shown in FIG. 6, the thinning process is performed by using a grinding tool such as a bite corresponding to the height of the annular shaving surfaces 16 </ b> A and 18 </ b> A or a grinding tool such as a grindstone (including both of them) (Also called a polishing tool) 72 can be performed by rotating it around the central axis 20A.

  Similarly, the lower surfaces of the annular shaving surfaces 16A and 18A can be processed by using a grinding / polishing tool 74 corresponding to these heights and rotating it around the central axis 20A. 16A and 18A indicated by broken lines in FIG. 6 are the upper surfaces (surfaces in contact with the skin) of the shaving surface, 16B and 18B are the lower surfaces of the shaving surfaces (surfaces on which the small blades 22A and 24A of the inner blade 12A slide, The blade sliding surface is shown. Of course, the outer cutter 10A may be rotated instead of or together with the rotation of the grinding / polishing tools 72, 74.

  Next, as shown in FIG. 7, a step of forming a round hole-like striking inlet 30 by shear press processing at the position where the thinning processing (grinding or polishing processing) is performed on the annular shaving surfaces 16A and 18A is performed. To do. More specifically, with respect to the annular shaving surfaces 16A and 18A of the three-dimensionally shaped member 10Ab, the back side (the surface that becomes the lower surface side) is supported by a die, and the front surface side (the surface that becomes the upper surface side) is punched. A plurality of round hole shaped entrances (round holes) 30 (30a, 30b) are formed by performing a shearing press from the side toward the back side. At this time, the shear cutting process is performed using the D-cut portion 9 as a position mark serving as a processing reference position for processing the three-dimensionally shaped member 10Ab. As a result, it is possible to form the round hole-like striking entrances (round holes) 30 (30a, 30b) at predetermined positions on the annular shaving surfaces 16A, 18A with the D-cut portion 9 as a reference.

According to the above-described process, the round hole-like striking inlet (round hole) 30 (30a, 30b) having a suitable dimension (as an example, an inner diameter of 0.3 to 0.6 [mm]) for catching wrinkles is provided. It can be formed by shear pressing. Therefore, the manufacturing method becomes easier, the manufacturing time can be shortened, and the manufacturing cost can be reduced as compared with the conventional drilling method by electric discharge machining method, electrolytic machining method, laser machining method, etching method. Is possible. Further, by performing shear pressing from the front surface side (upper surface side) to the back surface side (lower surface side), the lower surface (more specifically, the lower end portion of the round hole 30) of the outer blade 10A that is in sliding contact with the inner blade 12A is sharpened. Therefore, the sharpness of the ridge can be sharpened.
In addition, you may employ | adopt the method of performing a shear press process toward the surface side (upper surface side) from the back surface side (lower surface side). According to this, the burr | flash by a shear press process can be generated on the surface side (upper surface side) instead of the back surface side (lower surface side) where deburring is difficult. According to this, deburring can be performed by an easy surface treatment. In addition, since the lower surface of the outer blade 10A that is in sliding contact with the inner blade 12A (more specifically, the lower end portion of the round hole 30) can be formed in a shape without burrs, the sharpness of the ridge can be sharpened.

  Here, in the present embodiment, the round hole-like advancement entrance 30 is alternately arranged with the inner circumference side round holes 30a and the outer circumference side round holes 30b along the circumferential direction of the annular shaving surface 18A. It is formed in a zigzag pattern. If it demonstrates concretely using FIG. 8 which is the C section enlarged view in FIG. 7, the process at this time will be a plurality of round holes arranged on one of the inner peripheral side or the outer peripheral side (for example, FIG. ), Only one round hole 30a on the inner peripheral side in one round hole forming region 31) is subjected to shear press processing by a single press, and then the round arranged on the other side on the inner peripheral side or the outer peripheral side. A hole (for example, as shown in FIG. 8B, only the outer peripheral side round hole 30b in one round hole forming region 31) is subjected to shear pressing by one press. According to this, as described above, two types of punches for inner and outer peripheral round holes are prepared, and the distance between adjacent pins on the same radius in each punch is determined by a predetermined distance. Since it can be separated as described above, and the strength can be ensured by setting the pin diameter to a predetermined thickness, it is possible to form the round hole-like striking inlet 30 (30a, 30b) by shear press working. .

  In addition, after that, it is preferable to quench the solid shape member 10Ab.

  Next, as shown in FIG. 9, a step of forming a slit-like striking inlet 32 by a grinding process at a predetermined position on the annular shaving surface is performed. At this time, the grinding process is performed using the D-cut portion 9 as a position mark serving as a processing reference position for processing the three-dimensionally shaped member 10Ab. As a result, a slit-like advance entrance (slit) 32 can be formed at a predetermined position on the annular shaving surfaces 16A and 18A with the D-cut portion 9 as a reference. That is, by using the D-cut portion 9 as a common processing reference position in the above-described shear press processing and the grinding processing, a round hole-like advance entrance (round hole) 30 and a slit formed in separate processes, respectively. It is possible to form the straight entrance 32 (slit) 32 in a predetermined position without causing a positional shift.

  Here, the grinding process of the slit-like advancement entrance 32 is performed using a rotating disk grindstone 66 as shown in FIG. That is, with respect to the three-dimensional member 10Ab serving as the outer blade 10A, the rotating disk grindstone 66 is rotated from the upper side while rotating the outer periphery thereof in the vertical direction while moving substantially in the radial direction, and the annular shaving 14A is left leaving the annular shaving 14A. Cuts are made in the portions that become the surfaces 16A and 18A. The rotating disk grindstone 66 is a thin circular disk-shaped tool in which wear-resistant particles such as diamond abrasive grains are dispersed and cured in the abrasive grains.

  More specifically, first, the rotary disk grindstone 66 is processed to a depth along the first processing line 68 in FIG. 10 so that both the annular shaving surfaces 16A and 18A are processed simultaneously. That is, the rotation center A of the rotating disk grindstone 66 is moved in the substantially radial direction (the moving line 68a direction in FIG. 10) so that the outer periphery (cutting edge) of the rotating disk grindstone 66 moves along the first processing line 68. . Further, in order to selectively deeply process only the slit 32 of the outer annular shaving surface 16A, the rotation center A is set so that the outer periphery of the rotating disc grindstone 66 moves along the second processing line 70 shown in FIG. The center B is moved in the radial direction along a movement line 70 a parallel to the second processing line 70.

  Next, finishing thinning is performed on the annular shaving surfaces 16A and 18A of the three-dimensionally shaped member 10Ab. In the present embodiment, in the previous step, the annular shaving surfaces 16A and 18A are smaller than the inner diameter dimension (as an example, the inner diameter 0.3 to 0.6 [mm]) of the round hole-shaped advance entrance (described later). Is reduced to a thickness dimension (for example, a thickness of 0.2 [mm]). In this step, grinding or polishing is further performed to form the annular shaved surfaces 16A and 18A to a predetermined size. Processing is performed until the thickness dimension is reached (as an example, a thickness of 0.08 [mm]). Thereby, the three-dimensionally shaped member 10Ab is formed as the outer blade 10A. The outer blade 10A can be deeply shaved and has a sharp edge.

  As described above, according to the method for manufacturing the outer blade of the rotary electric shaver according to the present invention, the round hole-like advancement entrance 30 can be easily formed on the annular shaving surface 18A of the outer blade 10A by shear pressing. It can be formed at low cost. In addition, since the solid portion 34 can be increased by forming the round hole-like striking entrance 30 on the annular shaving surface 18A, it is possible to form the outer cutter 10A having a good touch.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the present invention. In particular, a rotary electric shaver having three combinations of outer blades and inner blades has been described as an example, but the present invention is not limited to this, and the combination of outer blades and inner blades may be one set or Needless to say, the present invention can be applied to two or four or more rotary electric shavers.

1 Rotary electric shaver 9 D cut part (position mark)
10A Outer blade 12A Inner blade 14A Annular groove 16A, 18A Annular shaving surface 20A Center axis (rotary axis)
22A, 24A Small blades 30, 30a, 30b Round hole-like advance entrance (round hole)
31 Round hole formation region 32 Slit-shaped advance entrance (slit)
33 Slit formation region 34 Solid portion 50 Main body portion 54 Case 58 Head portion 60 Blade frame body 62 Blade assembly body 66 Rotary disk grindstone

Claims (8)

An outer blade having an annular shaving surface on the upper surface formed with a number of screed entrances, and an inner blade having a small blade that rotates while sliding on the lower surface of the outer blade from below the shaving surface The outer blade is integrally formed with a plurality of concentric annular shaving surfaces, and at least one of the annular shaving surfaces is formed with a round hole-shaped advance entrance. A manufacturing method of an outer blade,
(A) A step of grinding or polishing a predetermined position where the round hole-shaped striking entrance is formed on the annular shaving surface so as to have a thickness dimension smaller than the inner diameter dimension of the round hole. ;
(B) A step of forming the round hole-like striking inlet by pressing at a position where the grinding or polishing is performed after the step (a);
The manufacturing method of the outer blade of a rotary electric shaver characterized by the above-mentioned.   In the step (b), the circular hole-shaped advancement entrance is formed in a zigzag pattern in which inner and outer circular holes are alternately arranged along the circumferential direction of the annular shaving surface. 2. The method for producing an outer blade of a rotary electric shaver according to claim 1, wherein the outer blade is a step of forming the same.   In the step (b), a plurality of round holes arranged on one of the inner peripheral side and the outer peripheral side are pressed by a single press, and then placed on the other of the inner peripheral side and the outer peripheral side. 3. The method for manufacturing an outer blade of a rotary electric shaver according to claim 2, wherein the round hole is a step of pressing by a single press. (C) After the step (b), a step of forming a slit-like striking inlet at a predetermined position of the annular shaving surface by grinding;
The manufacturing method of the outer blade of the rotary electric shaver according to any one of claims 1 to 3.   Before the step (b), the method includes a step of forming a position mark at a predetermined position of the outer blade, and the step (b) and the step (c) are performed using the position mark as a common processing reference position. 5. The method of manufacturing an outer blade of a rotary electric shaver according to claim 4, wherein processing in the process is performed.   The said position mark is a D-cut part formed in the outer periphery of the said outer blade, The manufacturing method of the outer blade of the rotary electric shaver of Claim 5 characterized by the above-mentioned.   By performing the step (b) and the step (c), a predetermined number of round hole forming regions each including a predetermined number of the circular hole-shaped striking inlets along the circumferential direction on the predetermined annular shaving surface. 5. The round hole-like striking inlet and the slit-like striking inlet are formed so as to be alternately arranged with slit-forming regions composed of the slit-like striking inlets. The manufacturing method of the outer blade of the rotary electric shaver of any one of -6.   The method for manufacturing an outer blade of a rotary electric shaver according to any one of claims 1 to 7, wherein the round hole-shaped screed inlet is formed on the annular shaving surface other than the outermost periphery.

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