WO2020039867A1 - Rotating shaver and inner blade of same - Google Patents

Rotating shaver and inner blade of same Download PDF

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Publication number
WO2020039867A1
WO2020039867A1 PCT/JP2019/030017 JP2019030017W WO2020039867A1 WO 2020039867 A1 WO2020039867 A1 WO 2020039867A1 JP 2019030017 W JP2019030017 W JP 2019030017W WO 2020039867 A1 WO2020039867 A1 WO 2020039867A1
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Prior art keywords
blade
cutting edge
forging
region
outer blade
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PCT/JP2019/030017
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French (fr)
Japanese (ja)
Inventor
政秀 ▲徳▼田
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株式会社Ｔｏｋｕｄａ－Ａｒｄ
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Publication of WO2020039867A1 publication Critical patent/WO2020039867A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/14—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the rotary-cutter type; Cutting heads therefor; Cutters therefor

Definitions

  • the present invention relates to a rotary shaver and its inner blade.
  • a disk-shaped outer blade provided with a plurality of slits on the surface and an inner blade provided inside the outer blade relatively rotate to cut a beard that has entered the slit.
  • the inner blade has a disk-shaped base and a plurality of small blades protruding from the base toward the inner surface of the outer blade, and each of the small blades and the inner edge of the slit are like scissors. , The beard is cut off.
  • Patent Documents 1 and 2 disclose examples of such a rotary shaver.
  • FIG. 6A is a diagram showing a cross section of the rotary shaver 100 according to the background art of the present invention.
  • the rotary shaver 100 includes an outer blade 101 having a slit 102 and an inner blade 110 having a base 111 and a small blade 112.
  • the outer blade 101 and the base 111 are each formed in a disk shape and share a central axis.
  • the small blade 112 is formed so as to protrude upward (toward the outer blade 101) from the base 111.
  • FIG. 6A also shows a beard H to be cut.
  • FIG. 6B is an enlarged view of FIG. 6A near the slit 102.
  • the outer blade 101 has a blade edge 103 at the lower end of the inner wall of the slit 102.
  • the small blade 112 has a cutting edge 114 having an angle ⁇ at the tip of the upper surface 113 in the rotation direction R.
  • a spring (not shown) is provided between the inner blade 110 and the housing of the rotary shaver 100.
  • This spring serves to press the upper surface 113 of the small blade 112 against the lower surface of the outer blade 101 by urging the inner blade 110 in the direction A (upward) shown in FIG.
  • the biasing force of the spring is set to be weak.
  • the inner blade 110 is configured to perform a rotational movement about the center axis of the outer blade 101 relative to the outer blade 101.
  • the rotation direction R shown in FIG. 6A indicates the direction of this rotational movement.
  • one of the objects of the present invention is to provide a rotary shaver with improved shaving taste and an inner blade thereof.
  • the rotary shaver includes a disk-shaped outer blade provided with a plurality of slits on a surface thereof, and an inner blade configured to be relatively rotatable with respect to the outer blade about a center axis of the outer blade as a rotation axis.
  • the outer blade has a cutting edge at a lower end of the inner wall of each of the plurality of slits
  • the inner blade has a disk-shaped base and a plurality of blades protruding from the base toward the outer blade.
  • Each of the plurality of small blades has first and second cutting edges provided separately from each other, and the second cutting edge is provided on an upper surface of the corresponding small blade.
  • the first shaving edge is a rotary shaver that is provided at a tip in a rotating direction and is provided closer to the base than the second cutting edge and at a position forward in the rotating direction.
  • the inner blade of the rotary shaver according to the present invention has a center axis of a disk-shaped outer blade having a blade edge at a lower end of each of a plurality of slits provided on the surface, and the center axis of the outer blade is relatively to the outer blade.
  • An inner blade of a rotary shaver configured to be rotatable, comprising a disk-shaped base, and a plurality of small blades protruding from the base toward the outer blade, wherein the plurality of small blades are Each has a first and a second cutting edge provided separately from each other, the second cutting edge is provided at the tip of the upper surface of the corresponding small blade in the rotation direction, and the first cutting edge is An inner blade of a rotary shaver provided closer to the base than the second blade edge and at a position forward in the rotation direction.
  • the first blade bites into the beard and pulls the beard downward.
  • the inner blade and the outer blade come into close contact with each other due to the force of the skin to return the beard once lowered.
  • the beard can be prevented from falling by sufficiently shortening the distance in the rotation direction between the first blade edge and the second blade edge. Therefore, it is possible to provide a rotary shaver having improved shaving taste and an inner blade thereof.
  • the first cutting edge may be formed at 90 degrees, and the second cutting edge may be formed at an angle smaller than the first cutting edge. According to this, the lowering of the beard by the first blade and the cutting of the beard by the second blade can be suitably performed.
  • the first and second cutting edges may be formed by forming an integral stainless steel by forging and then smoothing the corresponding upper surface. According to this, since the distance in the rotation direction between the first blade and the second blade can be reduced, it is possible to prevent the first blade from pulling the beard too much. Therefore, it is possible to prevent the user from feeling pain. In addition, since one piece of stainless steel is used, high durability can be obtained.
  • the smoothing is specifically performed by polishing or transferring the shape of the lower surface of the outer cutter to the upper surface by electric discharge machining.
  • the shaping is performed by forging two adjacent regions of a surface of the corresponding small blade positioned forward in the rotation direction at different depths by forging. It may be executed. According to this, the first cutting edge formed between the two regions can be formed with high accuracy.
  • the first blade bites into the beard and pulls the beard downward.
  • the inner blade and the outer blade come into close contact with each other due to the force of the skin that attempts to return the beard once lowered.
  • the beard can be prevented from falling by sufficiently shortening the distance in the rotation direction between the first blade edge and the second blade edge. Therefore, it is possible to provide a rotary shaver having improved shaving taste and an inner blade thereof.
  • FIG. 2 is an exploded perspective view showing an outer blade 10 and an inner blade 20 arranged in a head unit 3 shown in FIG. 1.
  • (A) is a top view of the inner cutter 20 shown in FIG. 2, and (b) is a side view of the inner cutter 20 shown in FIG.
  • FIG. 3 is a diagram schematically showing a result of observing a slit 11a shown in FIG. 2 from above with a microscope.
  • (A) is a figure which shows the cross section of the rotary shaver 1 shown in FIG. 1
  • (b) is a figure which expands (a) in the vicinity of the slit 11.
  • FIG. (A) is a figure which shows the cross section of the rotary shaver 100 by a background art
  • (b) is the figure which expanded (a) in the vicinity of the slit 102.
  • FIG. 1 is a view showing an appearance of a rotary shaver 1 according to an embodiment of the present invention.
  • the rotary shaver 1 includes a substantially cylindrical main body 2 and a head unit 3 installed at an upper end of the main body 2.
  • the main body 2 is formed of, for example, a resin and has a shape that can be easily held by a user with one hand.
  • the user normally uses the rotary shaver 1 while holding the main unit 2 with one hand and holding the head unit 3 against the chin.
  • a motor for rotating the outer blade 10 and the inner blade 20 (see FIG. 2) in the head portion 3 a battery for supplying power to the motor,
  • a circuit board including a control circuit for controlling the operation of the motor is disposed on a side surface of the main body 2, and the control circuit starts driving the motor when the user presses the power button 4 while the motor is stopped. When the user presses the power button 4, the motor stops driving.
  • the head portion 3 is a member having a structure in which a disk-shaped outer blade 10 is disposed at each of the three vertices of a triangle, and is connected to the main body 2 via a connection member (not shown).
  • the connection member serves to connect the main body 2 and the head 3 so that the head 3 can swing and move up and down with respect to the main body 2. Further, the connection member is configured to enable the user to replace the head unit 3.
  • the housing of the head unit 3 is formed of, for example, a resin, similarly to the main body 2.
  • FIG. 2 is an exploded perspective view showing the outer cutter 10 and the inner cutter 20 arranged in the head unit 3.
  • FIG. 1 shows only one outer blade 10 and the inner blade 20 formed inside the outer blade 10, the same applies to the other two outer blades 10 and the corresponding inner blades 20.
  • the outer blade 10 is a disk-shaped (more specifically, a cylindrical shape with a bottom)
  • the inner blade 20 is a member formed by connecting a cylindrical member below a disk-shaped member. It is a member.
  • Each member of the outer blade 10 and the inner blade 20 is arranged so as to share a central axis.
  • the outer cutter 10 and the inner cutter 20 are both formed of a rigid body such as stainless steel (more specifically, for example, a martensitic stainless steel represented by SUS420J2, for example).
  • the inner cutter 20 is configured to be rotatable relative to the outer cutter 10 around the shared central axis as a rotation axis by driving the above-described motor. More specifically, the inner blade 20 is configured to rotate in the illustrated rotation direction R2, and the outer blade 10 is configured to rotate in the illustrated rotation direction R1 (the direction opposite to the rotation direction R2) with the shared central axis as the rotation axis. You. Therefore, the rotation speed of the inner cutter 20 with respect to the outer cutter 10 is a speed obtained by adding these rotation speeds (the rotation speed with respect to the main body 2).
  • the shape of the outer cutter 10 will be specifically described.
  • the surface of the outer cutter 10 corresponding to the bottom of the bottomed cylinder (hereinafter referred to as the “upper surface” of the outer cutter 10) includes a plurality of slits 11a to 11d.
  • Each of the plurality of slits 11a to 11d penetrates the upper surface of the outer blade 10, and although not shown, has a cutting edge at the lower end (inner edge) of each inner wall.
  • the angle of the cutting edge is, for example, 90 °.
  • the upper surface of the outer cutter 10 is divided into three regions by two concentric circles centered on the center axis of the outer cutter 10, and the outermost region (hereinafter, referred to as “outer annular region”) has a slit.
  • Slits 11c and 11d are formed in the second region from the outside (hereinafter referred to as "inner annular region") 11a and 11b.
  • the plurality of slits 11a are substantially linear grooves formed to be slightly inclined with respect to the radial direction from the side surface of the outer cutter 10 to the inner periphery of the outer annular region, and are provided at equal intervals along the circumferential direction.
  • the end on the side surface of the outer cutter 10 is located behind the end on the inner peripheral side of the outer annular region.
  • Each slit 11a is not strictly a straight line, but is formed so as to be curved so that the central portion slightly swells forward in the rotation direction R1.
  • the specific number of the slits 11a is, for example, 45, and in this case, the installation interval between the slits is 8 °.
  • the plurality of slits 11b are substantially linear grooves provided one by one between two adjacent slits 11b.
  • Each slit 11b is provided along the adjacent slit 11a, and therefore has the same inclined and curved shape as the slit 11a.
  • the end of the slit 11b located on the inner peripheral side of the outer annular region is located slightly outside (the position close to the side surface of the outer cutter 10) that of the slit 11a. It is shorter than the entire length of the slit 11a.
  • the plurality of slits 11c are substantially linear grooves formed slightly inclining with respect to the radial direction from the outer periphery of the inner annular region to the inner periphery of the inner annular region.
  • the plurality of slits 11c are arranged, for example, in units of sets each including four, and each set is provided at equal intervals along the circumferential direction.
  • the specific number of sets of the slits 11c is, for example, five, and in this case, the installation interval of each set is 72 °.
  • Each slit 11c has the same inclined and curved shape as the slit 11a, and is arranged in each set at equal intervals along the circumferential direction.
  • the plurality of slits 11d are a plurality of circular holes arranged between sets of the slits 11c, and are arranged in a zigzag manner in a circumferential direction between two sets adjacent to each other.
  • the inner blade 20 has a disk-shaped base 21 and a plurality of small blades 22 protruding from the base 21 toward the outer blade 10. Be composed.
  • Each of the small blades 22 has an upper surface 22a which is smoothed so as to be parallel to the base 21.
  • a spring (not shown) is provided between the inner blade 20 and the housing of the head unit 3 (see FIG. 1).
  • the spring urges the inner blade 20 in an upward direction (a direction toward the outer blade 10; a direction A shown in FIG. 5A described later) so that the upper surface 22a of the small blade 22 is moved to the lower surface of the outer blade 10. Plays a pressing role. However, if the pressing force is too strong, the rotation of the inner blade 20 is hindered, so that the biasing force of the spring is set to be weak.
  • FIG. 3A is a top view of the inner cutter 20, and FIG. 3B is a side view of the inner cutter 20.
  • the plurality of small blades 22 are arranged in two rows along the circumference of the base 21.
  • the inner row corresponds to the slits 11c and 11d of the outer blade 10, and has a configuration in which seven small blades 22 are arranged at equal intervals.
  • the outer row corresponds to the slits 11a and 11b of the outer blade 10, and has a configuration in which 14 small blades 22 are arranged at equal intervals.
  • Each of the small blades 22 is formed so as to project obliquely at an angle ⁇ from the surface of the base 21.
  • ⁇ is the angle between the rotation direction R2 and the direction in which the small blade 22 projects, and is, for example, 65 °.
  • Each of the small blades 22 forms a substantially U-shaped groove in a circular stainless steel, and uses a forging process and a smoothing process on a tip formed as a result thereof to form a cutting edge (a primary blade 23a and a secondary blade 23b described later). Is formed, a portion corresponding to the root of the small blade 22 is bent to an angle ⁇ .
  • the method of forming the primary blade 23a and the secondary blade 23b will be described later in more detail. As understood from FIGS. 3A and 3B, the primary blade 23a and the secondary blade 23b are each formed in a straight line orthogonal to the rotation direction R2.
  • FIG. 4 is a view schematically showing the result of observing the slit 11a from above with a microscope.
  • the slit 11a is inclined with respect to the radial direction and has a curved shape, when viewed with a microscope, the inner wall of the slit 11a (and the cutting edge formed at the lower end thereof) and the small blade 22 are formed.
  • the cutting edge is not parallel, but is oblique as shown in FIG.
  • the cutting edge of the small blade 22 specifically, the secondary blade 23b
  • a cutting edge 12 shown in FIG. 5B described later gradually overlaps from the end near the shared central axis, and as a result, cutting like scissors is realized.
  • FIG. 5A is a diagram showing a cross section of the rotary shaver 1.
  • FIG. 2 also shows a beard H of the user to be cut.
  • FIG. 5B is an enlarged view of FIG. 5A near the slit 11. In these figures, only one blade 22 and slit 11 are shown. In the following, the description will be continued focusing on the illustrated blade 22 and slit 11, but the other blade 22 and slit 11 will be described. The same is true.
  • the small blade 22 includes a primary blade 23a (first blade) and a secondary blade 23b (second blade) provided separately from each other.
  • the secondary blade 23b is formed at an angle ⁇ at the tip of the upper surface 22a of the small blade 22 in the rotation direction R2, as shown in FIG. 5B.
  • the primary blade 23a is formed at a position closer to the base 21 and at a position 90 degrees ahead of the secondary blade 23b when viewed in the rotation direction R2.
  • the position forward in the rotation direction R2 means that the position Ta in the circumferential direction of the illustrated primary blade 23a is ahead of the position Tb in the circumferential direction of the secondary blade 23b in the rotation direction R2.
  • the primary blade 23a and the secondary blade 23b are formed by forming an integral stainless steel by forging and then smoothing the upper surface 22a of the small blade 22. Forming by forging is performed by forging two adjacent areas A1 and A2 of the surface 22b located forward in the rotation direction R2 of the small blade 22 at different depths by forging.
  • the region A2 is a rectangular region having the upper edge of the surface 22b before forging / smoothing as one side.
  • the area A1 is a rectangular area having one side on the lower side of the rectangular area A2 (one side opposed to the above-described upper edge).
  • the region A2 is pressed into the depth D2 and the region A1 is pressed at a depth D1 shallower than the depth D2 perpendicularly to the surface 22b.
  • the primary blade 23a is formed at the boundary between the region A1 and the region A2.
  • an edge 23c that appears to have a shape similar to the primary blade 23a at first glance is formed below the region A1, but it is difficult to form the edge 23c sharply in an actual forging process.
  • the edge 23c cannot be expected to function as a cutting edge.
  • forging using the two-step depth as described above is essential.
  • the position of the primary blade 23a in the rotation direction R2 is set ahead of the edge 23c. That is, the formation of the primary blade 23a is performed such that the circumferential position Ta of the illustrated primary blade 23a is ahead of the circumferential position Tc of the edge 23c when viewed in the rotation direction R2. This is because the primary blade 23a is brought into contact with the beard H before the edge 23c whose shape is not determined comes into contact with the beard H.
  • the upper surface 22a of the small blade 22 is smoothed.
  • the upper surface 22a is smoothed so that the upper surface 22a and the surface 22b of the small blade 22 form an angle ⁇ .
  • the secondary blade 23b having the angle ⁇ is formed, and finally (after the root of the small blade 22 is bent to the angle ⁇ ), the upper surface 22a is parallel to the base 21 and the lower surface of the outer blade 10. .
  • the smoothing step may be performed after the root of the small blade 22 is bent.
  • the shape of the upper surface 22a of the small blade 22 is formed along the lower surface of the outer blade 10 (that is, the clearance between the upper surface 22a of the small blade 22 and the lower surface of the outer blade 10 is constant). And is typically performed by polishing.
  • the lower surface of the outer cutter 10 is a curved surface or the like, electric discharge machining may be used instead of polishing. That is, a shape electrode having a shape corresponding to the shape of the lower surface of the outer blade 10 is formed, and the shape of the lower surface of the outer blade 10 is transferred to the upper surface 22a of the small blade 22 by performing electric discharge machining using the shape electrode. You may do it.
  • the user's beard H enters the slit 11 as shown in FIG.
  • the primary blade 23a first bites into the beard H, and pulls down the beard H in the illustrated direction C (downward).
  • the secondary blade 23b and the blade edge 12 of the outer blade 10 start cutting the beard H
  • the inner blade 20 is lifted in the illustrated direction D (upward) by the force of the skin to return the beard H once lowered.
  • the inner cutter 20 and the outer cutter 10 come into close contact with each other. Therefore, according to the rotary shaver 1 of the present invention, a gap as shown in FIG. 6 does not occur between the inner cutter 20 and the outer cutter 10.
  • the small blades 22 are formed using integral stainless steel, high durability can be obtained.
  • two adjacent areas A1 and A2 of the front surface 22b positioned forward in the rotation direction R2 of each of the small blades 22 are forged to different depths D1 and D1. Since the primary blade 23a is formed by pushing in with D2, the primary blade 23a can be formed with higher precision than when the edge 23c shown in FIG. 5B is used as the primary blade.

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  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)

Abstract

[Problem] To provide a rotating shaver in which the shave quality is improved, and an inner blade of the rotating shaver. [Solution] This rotating shaver (1) comprises a discoid outer blade (10) having a plurality of slits (11) provided in the surface thereof, and an inner blade (20) configured to be capable of rotating relative to the outer blade (10) about the central axis of the outer blade (10). The outer blade (10) has a blade edge at a lower end of inner walls of each of the plurality of slits (11). The inner blade (20) has a discoid base (21), and a plurality of small blades (22) that project from the base (21) toward the outer blade (10). Each of the plurality of small blades (22) has a primary blade (23a) and a secondary blade (23b) that are provided so as to be set apart from each other. The secondary blades (23b) are provided at rotational-direction R2 distal ends of upper surfaces (22a) of the corresponding small blades (22). The primary blades (23a) are provided at positions that are closer to the base (21) and farther forward in the rotational direction R2 than the secondary blades (23b).

Description

回転式シェーバー及びその内刃Rotary shaver and its inner blade
　本発明は、回転式シェーバー及びその内刃に関する。 The present invention relates to a rotary shaver and its inner blade.
　回転式シェーバーには、表面に複数のスリットが設けられた円盤状の外刃と、外刃の内側に設けられた内刃とが相対的に回転することにより、スリットに入った髭を切断するように構成されたものがある。内刃は、円盤状の基台と、この基台から外刃の内側面に向かって突出する複数の小刃とを有して構成され、各小刃とスリットの内側エッジとがハサミのように機能することにより、髭が切断される。特許文献１，２には、このような回転式シェーバーの一例が開示されている。 In a rotary shaver, a disk-shaped outer blade provided with a plurality of slits on the surface and an inner blade provided inside the outer blade relatively rotate to cut a beard that has entered the slit. Some are configured as follows. The inner blade has a disk-shaped base and a plurality of small blades protruding from the base toward the inner surface of the outer blade, and each of the small blades and the inner edge of the slit are like scissors. , The beard is cut off. Patent Documents 1 and 2 disclose examples of such a rotary shaver.
　この種の回転式シェーバーにおいては、例えば特許文献１の図８等に示されるように、各小刃の上面端部に鋭角の刃先が設けられる。特許文献１に記載されるように、従来、この刃先の角度はできるだけ小さい方がよいとされており、特許文献１には、小刃の剛性を保ちつつ、刃先の角度をできるだけ小さくするための発明が開示されている。 回 転 In this type of rotary shaver, as shown in, for example, FIG. 8 of Patent Document 1, an acute-angled cutting edge is provided at an upper surface end of each small blade. As described in Patent Literature 1, conventionally, it is considered that the angle of the cutting edge is preferably as small as possible. Patent Literature 1 discloses that the angle of the cutting edge is reduced as much as possible while maintaining the rigidity of the small blade. The invention has been disclosed.
特開２０１５－０７１００２号公報JP-A-2005-071002 米国特許出願公開第２０１３／０１４５６２７号明細書US Patent Application Publication No. 2013/0145627
　ところで、背景技術による回転式シェーバーには、十分な剃り味を提供することが難しいという課題がある。以下、この課題について、図面を参照しながら詳しく説明する。 回 転 By the way, there is a problem in the rotary shaver according to the background art that it is difficult to provide a sufficient shaving taste. Hereinafter, this problem will be described in detail with reference to the drawings.
　図６（ａ）は、本発明の背景技術による回転式シェーバー１００の断面を示す図である。同図に示すように、回転式シェーバー１００は、スリット１０２を有する外刃１０１と、基台１１１及び小刃１１２を有する内刃１１０と、を備えて構成される。外刃１０１及び基台１１１はそれぞれ円盤状に形成され、中心軸を共有している。小刃１１２は、基台１１１から上側（外刃１０１側）に向かって突出するように形成される。図６（ａ）には、切断対象となる髭Ｈも図示している。 FIG. 6A is a diagram showing a cross section of the rotary shaver 100 according to the background art of the present invention. As shown in FIG. 1, the rotary shaver 100 includes an outer blade 101 having a slit 102 and an inner blade 110 having a base 111 and a small blade 112. The outer blade 101 and the base 111 are each formed in a disk shape and share a central axis. The small blade 112 is formed so as to protrude upward (toward the outer blade 101) from the base 111. FIG. 6A also shows a beard H to be cut.
　図６（ｂ）は、図６（ａ）をスリット１０２の付近で拡大してなる図である。同図に示すように、外刃１０１は、スリット１０２の内壁の下端に刃先１０３を有して構成される。また、小刃１１２は、上面１１３の回転方向Ｒの先端に、角度αの刃先１１４を有して構成される。 FIG. 6B is an enlarged view of FIG. 6A near the slit 102. As shown in the figure, the outer blade 101 has a blade edge 103 at the lower end of the inner wall of the slit 102. The small blade 112 has a cutting edge 114 having an angle α at the tip of the upper surface 113 in the rotation direction R.
　内刃１１０と回転式シェーバー１００の筐体との間には、図示しないスプリングが設けられる。このスプリングは、内刃１１０を図６（ａ）に示した方向Ａ（上方向）に付勢することにより、小刃１１２の上面１１３を外刃１０１の下面に押しつける役割を果たす。ただし、強く押しつけすぎると内刃１１０の回転が阻害されてしまうため、スプリングによる付勢力は弱めに設定されている。 ス プ リ ン グ A spring (not shown) is provided between the inner blade 110 and the housing of the rotary shaver 100. This spring serves to press the upper surface 113 of the small blade 112 against the lower surface of the outer blade 101 by urging the inner blade 110 in the direction A (upward) shown in FIG. However, if the pressing force is too strong, the rotation of the inner blade 110 is hindered. Therefore, the biasing force of the spring is set to be weak.
　内刃１１０は、外刃１０１に対して相対的に、外刃１０１の中心軸を回転軸とする回転移動を行うように構成される。図６（ａ）に示した回転方向Ｒは、この回転移動の方向を示している。内刃１１０が外刃１０１に対して相対的に回転すると、刃先１１４及び刃先１０３がハサミを構成する２つの刃のようにかみ合う。スリット１０２内に入った髭Ｈは、こうしてかみ合った刃先１１４及び刃先１０３によって切断される。 The inner blade 110 is configured to perform a rotational movement about the center axis of the outer blade 101 relative to the outer blade 101. The rotation direction R shown in FIG. 6A indicates the direction of this rotational movement. When the inner blade 110 rotates relative to the outer blade 101, the cutting edge 114 and the cutting edge 103 engage like two blades forming scissors. The beard H that has entered the slit 102 is cut by the blade edge 114 and the blade edge 103 thus engaged.
　刃先１０３，１１４の間に髭Ｈが挟まれているとき、内刃１１０には図示した方向Ｂ（下方向）の力が加わる。上述したスプリングによる付勢力はこの方向Ｂの力を打ち消すほど強くないため、この方向Ｂの力が加わることにより、図６（ｂ）に示すように、内刃１１０の上面１１３と外刃１０１の下面との間にはギャップＧが生ずる。また、内刃１１０の回転に伴い、髭が回転方向に引っ張られて倒れてしまう。これらの結果として、髭Ｈを切断する力が弱まり、ユーザには、剃り味の低下として認知されることになる。 と き When the beard H is sandwiched between the blade edges 103 and 114, a force in the illustrated direction B (downward) is applied to the inner blade 110. Since the biasing force of the above-described spring is not strong enough to cancel the force in the direction B, when the force in the direction B is applied, as shown in FIG. A gap G is formed between the lower surface and the lower surface. Further, with the rotation of the inner blade 110, the beard is pulled in the rotating direction and falls down. As a result, the force for cutting the beard H is weakened, and the user perceives that the shaving taste is low.
　したがって、本発明の目的の一つは、剃り味の改善された回転式シェーバー及びその内刃を提供することにある。 Therefore, one of the objects of the present invention is to provide a rotary shaver with improved shaving taste and an inner blade thereof.
　本発明による回転式シェーバーは、表面に複数のスリットが設けられた円盤状の外刃と、前記外刃の中心軸を回転軸として前記外刃に対して相対的に回転可能に構成された内刃と、を備え、前記外刃は、前記複数のスリットそれぞれの内壁の下端に刃先を有し、前記内刃は、円盤状の基台と、該基台から外刃に向かって突出する複数の小刃と、を有し、前記複数の小刃はそれぞれ、互いに分離して設けられた第１及び第２の刃先を有し、前記第２の刃先は、対応する前記小刃の上面の回転方向の先端に設けられ、前記第１の刃先は、前記第２の刃先に比べ、前記基台に近く、かつ、前記回転方向に見て前方の位置に設けられる、回転式シェーバーである。 The rotary shaver according to the present invention includes a disk-shaped outer blade provided with a plurality of slits on a surface thereof, and an inner blade configured to be relatively rotatable with respect to the outer blade about a center axis of the outer blade as a rotation axis. The outer blade has a cutting edge at a lower end of the inner wall of each of the plurality of slits, and the inner blade has a disk-shaped base and a plurality of blades protruding from the base toward the outer blade. Each of the plurality of small blades has first and second cutting edges provided separately from each other, and the second cutting edge is provided on an upper surface of the corresponding small blade. The first shaving edge is a rotary shaver that is provided at a tip in a rotating direction and is provided closer to the base than the second cutting edge and at a position forward in the rotating direction.
　また、本発明による回転式シェーバーの内刃は、表面に設けられた複数のスリットそれぞれの内壁の下端に刃先を有する円盤状の外刃の中心軸を回転軸として前記外刃に対して相対的に回転可能に構成された回転式シェーバーの内刃であって、円盤状の基台と、該基台から外刃に向かって突出する複数の小刃と、を備え、前記複数の小刃はそれぞれ、互いに分離して設けられた第１及び第２の刃先を有し、前記第２の刃先は、対応する前記小刃の上面の回転方向の先端に設けられ、前記第１の刃先は、前記第２の刃先に比べ、前記基台に近く、かつ、前記回転方向に見て前方の位置に設けられる、回転式シェーバーの内刃である。 Further, the inner blade of the rotary shaver according to the present invention has a center axis of a disk-shaped outer blade having a blade edge at a lower end of each of a plurality of slits provided on the surface, and the center axis of the outer blade is relatively to the outer blade. An inner blade of a rotary shaver configured to be rotatable, comprising a disk-shaped base, and a plurality of small blades protruding from the base toward the outer blade, wherein the plurality of small blades are Each has a first and a second cutting edge provided separately from each other, the second cutting edge is provided at the tip of the upper surface of the corresponding small blade in the rotation direction, and the first cutting edge is An inner blade of a rotary shaver provided closer to the base than the second blade edge and at a position forward in the rotation direction.
　本発明によれば、まず第１の刃先が髭に食い込み、髭を下方向に引き下げる。次いで第２の刃先及び外刃の刃先が髭を切断し始めると、一度引き下げた髭を戻そうとする肌の力により、内刃と外刃が密着する。また、第１の刃先と第２の刃先との間の回転方向の距離を十分短くすることで、髭が倒れることを防止できる。したがって、剃り味の改善された回転式シェーバー及びその内刃を提供することが可能になる。 According to the present invention, first, the first blade bites into the beard and pulls the beard downward. Next, when the blades of the second blade and the outer blade start cutting the beard, the inner blade and the outer blade come into close contact with each other due to the force of the skin to return the beard once lowered. In addition, the beard can be prevented from falling by sufficiently shortening the distance in the rotation direction between the first blade edge and the second blade edge. Therefore, it is possible to provide a rotary shaver having improved shaving taste and an inner blade thereof.
　上記回転式シェーバー又はその内刃において、前記第１の刃先は９０度に形成され、前記第２の刃先は前記第１の刃先より小さい角度に形成される、こととしてもよい。これによれば、第１の刃先による髭の引き下げと、第２の刃先による髭の切断とを好適に実行することが可能になる。 In the rotary shaver or the inner blade thereof, the first cutting edge may be formed at 90 degrees, and the second cutting edge may be formed at an angle smaller than the first cutting edge. According to this, the lowering of the beard by the first blade and the cutting of the beard by the second blade can be suitably performed.
　上記回転式シェーバー又はその内刃において、前記第１及び第２の刃先は、一体のステンレスを鍛造により成形した後、対応する前記上面を平滑化することによって形成される、こととしてもよい。これによれば、第１の刃先と第２の刃先の間の回転方向の距離を小さくすることができるので、第１の刃先が髭を引っ張り過ぎることを防止できる。したがって、ユーザに痛みを感じさせてしまうことを防止できる。また、一体のステンレスを用いるので、高い耐久性を得ることができる。なお、平滑化は、具体的には、研磨、あるいは、前記外刃の下面の形状を放電加工によって前記上面に転写することによって実行されることが好ましい。 In the rotary shaver or the inner blade thereof, the first and second cutting edges may be formed by forming an integral stainless steel by forging and then smoothing the corresponding upper surface. According to this, since the distance in the rotation direction between the first blade and the second blade can be reduced, it is possible to prevent the first blade from pulling the beard too much. Therefore, it is possible to prevent the user from feeling pain. In addition, since one piece of stainless steel is used, high durability can be obtained. Preferably, the smoothing is specifically performed by polishing or transferring the shape of the lower surface of the outer cutter to the upper surface by electric discharge machining.
　上記回転式シェーバー又はその内刃において、前記成形は、対応する前記小刃の前記回転方向に見て前方に位置する表面のうち隣接する２つの領域を、鍛造により互いに異なる深さで押し込むことによって実行される、こととしてもよい。これによれば、２つの領域の間に形成される第１の刃先を高精度に形成することが可能になる。 In the above-mentioned rotary shaver or the inner blade thereof, the shaping is performed by forging two adjacent regions of a surface of the corresponding small blade positioned forward in the rotation direction at different depths by forging. It may be executed. According to this, the first cutting edge formed between the two regions can be formed with high accuracy.
　本発明によれば、まず第１の刃先が髭に食い込み、髭を下方向に引き下げる。次いで第２の刃先が髭を切断し始めると、一度引き下げた髭を戻そうとする肌の力により、内刃と外刃が密着する。また、第１の刃先と第２の刃先との間の回転方向の距離を十分短くすることで、髭が倒れることを防止できる。したがって、剃り味の改善された回転式シェーバー及びその内刃を提供することが可能になる。 According to the present invention, first, the first blade bites into the beard and pulls the beard downward. Next, when the second cutting edge starts cutting the beard, the inner blade and the outer blade come into close contact with each other due to the force of the skin that attempts to return the beard once lowered. In addition, the beard can be prevented from falling by sufficiently shortening the distance in the rotation direction between the first blade edge and the second blade edge. Therefore, it is possible to provide a rotary shaver having improved shaving taste and an inner blade thereof.
本発明の実施の形態による回転式シェーバー１の外観を示す図である。It is a figure showing appearance of rotary type shaver 1 by an embodiment of the invention. 図１に示したヘッド部３内に配置される外刃１０及び内刃２０を示す分解斜視図である。FIG. 2 is an exploded perspective view showing an outer blade 10 and an inner blade 20 arranged in a head unit 3 shown in FIG. 1. （ａ）は、図２に示した内刃２０の上面図であり、（ｂ）は、図２に示した内刃２０の側面図である。(A) is a top view of the inner cutter 20 shown in FIG. 2, and (b) is a side view of the inner cutter 20 shown in FIG. 図２に示したスリット１１ａを上側からマイクロスコープで観測した結果を模式的に示す図である。FIG. 3 is a diagram schematically showing a result of observing a slit 11a shown in FIG. 2 from above with a microscope. （ａ）は、図１に示した回転式シェーバー１の断面を示す図であり、（ｂ）は、（ａ）をスリット１１の付近で拡大してなる図である。(A) is a figure which shows the cross section of the rotary shaver 1 shown in FIG. 1, (b) is a figure which expands (a) in the vicinity of the slit 11. FIG. （ａ）は、背景技術による回転式シェーバー１００の断面を示す図であり、（ｂ）は、（ａ）をスリット１０２の付近で拡大してなる図である。(A) is a figure which shows the cross section of the rotary shaver 100 by a background art, (b) is the figure which expanded (a) in the vicinity of the slit 102.
　以下、添付図面を参照しながら、本発明の実施の形態について詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
　図１は、本発明の実施の形態による回転式シェーバー１の外観を示す図である。同図に示すように、回転式シェーバー１は、略円筒形の本体２と、本体２の上端に設置されたヘッド部３とを有して構成される。 FIG. 1 is a view showing an appearance of a rotary shaver 1 according to an embodiment of the present invention. As shown in FIG. 1, the rotary shaver 1 includes a substantially cylindrical main body 2 and a head unit 3 installed at an upper end of the main body 2.
　本体２は、例えば樹脂によって形成されており、ユーザが片手で保持しやすい形状を有している。ユーザは通常、この本体２を片手で握った状態でヘッド部３を顎に当てながら、回転式シェーバー１を使用する。図示していないが、本体２の内部には、ヘッド部３内の外刃１０及び内刃２０（図２を参照）を回転させるためのモーターと、モーターに電力を供給するための電池と、モーターの動作を制御するための制御回路を含む回路基板とが配置される。本体２の側面には電源ボタン４が配置されており、上記制御回路は、モーターが止まっている状態でユーザがこの電源ボタン４を押すとモーターの駆動を開始し、モーターが動いている状態でユーザがこの電源ボタン４を押すとモーターの駆動を停止するよう構成される。 The main body 2 is formed of, for example, a resin and has a shape that can be easily held by a user with one hand. The user normally uses the rotary shaver 1 while holding the main unit 2 with one hand and holding the head unit 3 against the chin. Although not shown, inside the main body 2, a motor for rotating the outer blade 10 and the inner blade 20 (see FIG. 2) in the head portion 3, a battery for supplying power to the motor, And a circuit board including a control circuit for controlling the operation of the motor. A power button 4 is disposed on a side surface of the main body 2, and the control circuit starts driving the motor when the user presses the power button 4 while the motor is stopped. When the user presses the power button 4, the motor stops driving.
　ヘッド部３は、三角形の３つの頂点のそれぞれに円盤状の外刃１０が配置された構造を有する部材であり、図示しない接続部材を介して本体２と接続されている。この接続部材は、本体２に対してヘッド部３が揺動かつ上下動できるように、本体２とヘッド部３を接続する役割を果たす。また、接続部材は、ユーザによるヘッド部３の取り替えを可能にするように構成される。ヘッド部３の筐体は、本体２と同様に、例えば樹脂によって形成される。 The head portion 3 is a member having a structure in which a disk-shaped outer blade 10 is disposed at each of the three vertices of a triangle, and is connected to the main body 2 via a connection member (not shown). The connection member serves to connect the main body 2 and the head 3 so that the head 3 can swing and move up and down with respect to the main body 2. Further, the connection member is configured to enable the user to replace the head unit 3. The housing of the head unit 3 is formed of, for example, a resin, similarly to the main body 2.
　図２は、ヘッド部３内に配置される外刃１０及び内刃２０を示す分解斜視図である。同図には、１つの外刃１０と、その内側に形成される内刃２０とのみを示しているが、他の２つの外刃１０及びそれぞれに対応する内刃２０についても同様である。同図に示すように、外刃１０は円盤状（より具体的には、有底円筒状）の部材であり、内刃２０は円盤状部材の下に円筒状部材が接続されてなる形状の部材である。外刃１０及び内刃２０の各部材は、中心軸を共有するように配置される。また、外刃１０及び内刃２０はともに、例えばステンレスなどの剛体（より具体的には、例えばＳＵＳ４２０Ｊ２に代表されるマルテンサイト系ステンレス）によって形成される。 FIG. 2 is an exploded perspective view showing the outer cutter 10 and the inner cutter 20 arranged in the head unit 3. FIG. Although FIG. 1 shows only one outer blade 10 and the inner blade 20 formed inside the outer blade 10, the same applies to the other two outer blades 10 and the corresponding inner blades 20. As shown in the figure, the outer blade 10 is a disk-shaped (more specifically, a cylindrical shape with a bottom), and the inner blade 20 is a member formed by connecting a cylindrical member below a disk-shaped member. It is a member. Each member of the outer blade 10 and the inner blade 20 is arranged so as to share a central axis. The outer cutter 10 and the inner cutter 20 are both formed of a rigid body such as stainless steel (more specifically, for example, a martensitic stainless steel represented by SUS420J2, for example).
　内刃２０は、上述したモーターの駆動により、共有中心軸を回転軸として、外刃１０に対して相対的に回転可能に構成される。より具体的には、内刃２０は図示した回転方向Ｒ２に、外刃１０は図示した回転方向Ｒ１（回転方向Ｒ２とは逆方向）に、それぞれ共有中心軸を回転軸として回転するよう構成される。したがって、外刃１０に対する内刃２０の回転速度は、これらの回転速度（本体２に対する回転速度）を合算してなる速度となる。 The inner cutter 20 is configured to be rotatable relative to the outer cutter 10 around the shared central axis as a rotation axis by driving the above-described motor. More specifically, the inner blade 20 is configured to rotate in the illustrated rotation direction R2, and the outer blade 10 is configured to rotate in the illustrated rotation direction R1 (the direction opposite to the rotation direction R2) with the shared central axis as the rotation axis. You. Therefore, the rotation speed of the inner cutter 20 with respect to the outer cutter 10 is a speed obtained by adding these rotation speeds (the rotation speed with respect to the main body 2).
　外刃１０の形状について具体的に説明すると、有底円筒の底に相当する外刃１０の表面（以下、外刃１０の「上面」という）には、各複数のスリット１１ａ～１１ｄを含む複数のスリット１１が設けられる。複数のスリット１１ａ～１１ｄはいずれも外刃１０の上面を貫通しており、図示していないが、それぞれの内壁の下端（内側エッジ）に刃先を有している。この刃先の角度は、例えば９０°である。外刃１０の上面は、外刃１０の中心軸を中心とする２つの同心円により３つの領域に区切られており、このうち最も外側の領域（以下、「外側環状領域」と称する）にはスリット１１ａ，１１ｂが、外側から２番目の領域（以下、「内側環状領域」と称する）にはスリット１１ｃ，１１ｄがそれぞれ形成される。 The shape of the outer cutter 10 will be specifically described. The surface of the outer cutter 10 corresponding to the bottom of the bottomed cylinder (hereinafter referred to as the “upper surface” of the outer cutter 10) includes a plurality of slits 11a to 11d. Are provided. Each of the plurality of slits 11a to 11d penetrates the upper surface of the outer blade 10, and although not shown, has a cutting edge at the lower end (inner edge) of each inner wall. The angle of the cutting edge is, for example, 90 °. The upper surface of the outer cutter 10 is divided into three regions by two concentric circles centered on the center axis of the outer cutter 10, and the outermost region (hereinafter, referred to as “outer annular region”) has a slit. Slits 11c and 11d are formed in the second region from the outside (hereinafter referred to as "inner annular region") 11a and 11b.
　複数のスリット１１ａは、それぞれ外刃１０の側面から外側環状領域の内周にかけ半径方向に対して若干傾斜して形成された略直線状の溝であり、円周方向に沿って等間隔で設けられる。具体的には、回転方向Ｒ１に見て、外刃１０の側面側の端部が外側環状領域の内周側の端部よりも後方に位置している。また、各スリット１１ａは、厳密には直線ではなく、中央部が回転方向Ｒ１の前方に若干膨らむように湾曲して形成されている。スリット１１ａの具体的な個数は例えば４５個であり、この場合、各スリットの設置間隔は８°となる。 The plurality of slits 11a are substantially linear grooves formed to be slightly inclined with respect to the radial direction from the side surface of the outer cutter 10 to the inner periphery of the outer annular region, and are provided at equal intervals along the circumferential direction. Can be Specifically, when viewed in the rotation direction R1, the end on the side surface of the outer cutter 10 is located behind the end on the inner peripheral side of the outer annular region. Each slit 11a is not strictly a straight line, but is formed so as to be curved so that the central portion slightly swells forward in the rotation direction R1. The specific number of the slits 11a is, for example, 45, and in this case, the installation interval between the slits is 8 °.
　複数のスリット１１ｂは、隣接する２つのスリット１１ｂの間に１つずつ設けられた略直線状の溝である。各スリット１１ｂは、隣接するスリット１１ａに沿って設けられており、したがって、スリット１１ａと同様の傾斜及び湾曲形状を有している。ただし、外側環状領域の内周側に位置するスリット１１ｂの端部は、スリット１１ａのそれよりも若干外側（外刃１０の側面に近い位置）に位置しており、したがって、スリット１１ｂの全長はスリット１１ａの全長よりも短くなっている。 The plurality of slits 11b are substantially linear grooves provided one by one between two adjacent slits 11b. Each slit 11b is provided along the adjacent slit 11a, and therefore has the same inclined and curved shape as the slit 11a. However, the end of the slit 11b located on the inner peripheral side of the outer annular region is located slightly outside (the position close to the side surface of the outer cutter 10) that of the slit 11a. It is shorter than the entire length of the slit 11a.
　複数のスリット１１ｃは、それぞれ内側環状領域の外周から内側環状領域の内周にかけ半径方向に対して若干傾斜して形成された略直線状の溝である。複数のスリット１１ｃは、例えば４個を１セットとするセットの単位で配置されており、各セットは、円周方向に沿って等間隔で設けられる。スリット１１ｃのセットの具体的な個数は例えば５個であり、この場合、各セットの設置間隔は７２°となる。各スリット１１ｃは、スリット１１ａと同様の傾斜及び湾曲形状を有しており、円周方向に沿って等間隔で各セット内に配置される。 The plurality of slits 11c are substantially linear grooves formed slightly inclining with respect to the radial direction from the outer periphery of the inner annular region to the inner periphery of the inner annular region. The plurality of slits 11c are arranged, for example, in units of sets each including four, and each set is provided at equal intervals along the circumferential direction. The specific number of sets of the slits 11c is, for example, five, and in this case, the installation interval of each set is 72 °. Each slit 11c has the same inclined and curved shape as the slit 11a, and is arranged in each set at equal intervals along the circumferential direction.
　複数のスリット１１ｄは、スリット１１ｃのセットの間に配置された複数の円形の穴であり、隣接する２つのセットの間に、円周方向に沿って７個ずつ千鳥配置される。 The plurality of slits 11d are a plurality of circular holes arranged between sets of the slits 11c, and are arranged in a zigzag manner in a circumferential direction between two sets adjacent to each other.
　次に内刃２０の形状について具体的に説明すると、内刃２０は、円盤状の基台２１と、基台２１から外刃１０に向かって突出する複数の小刃２２と、を有して構成される。各小刃２２は、基台２１と平行となるように平滑化された上面２２ａを有している。 Next, the shape of the inner blade 20 will be specifically described. The inner blade 20 has a disk-shaped base 21 and a plurality of small blades 22 protruding from the base 21 toward the outer blade 10. Be composed. Each of the small blades 22 has an upper surface 22a which is smoothed so as to be parallel to the base 21.
　内刃２０とヘッド部３の筐体（図１を参照）との間には、図示しないスプリングが設けられる。このスプリングは、内刃２０を上方向（外刃１０に向かう方向。後述する図５（ａ）に示す方向Ａ）に付勢することにより、小刃２２の上面２２ａを外刃１０の下面に押しつける役割を果たす。ただし、強く押しつけすぎると内刃２０の回転が阻害されてしまうため、スプリングによる付勢力は弱めに設定されている。 ス プ リ ン グ A spring (not shown) is provided between the inner blade 20 and the housing of the head unit 3 (see FIG. 1). The spring urges the inner blade 20 in an upward direction (a direction toward the outer blade 10; a direction A shown in FIG. 5A described later) so that the upper surface 22a of the small blade 22 is moved to the lower surface of the outer blade 10. Plays a pressing role. However, if the pressing force is too strong, the rotation of the inner blade 20 is hindered, so that the biasing force of the spring is set to be weak.
　図３（ａ）は、内刃２０の上面図であり、図３（ｂ）は、内刃２０の側面図である。これらの図に示すように、複数の小刃２２は、基台２１の円周に沿って２列に配置される。内側の列は、外刃１０のスリット１１ｃ，１１ｄに対応しており、７個の小刃２２が等間隔で配置された構成を有する。外側の列は、外刃１０のスリット１１ａ，１１ｂに対応しており、１４個の小刃２２が等間隔で配置された構成を有する。また、各小刃２２は、基台２１の表面から角度θで斜めに突出するように形成される。θは回転方向Ｒ２と小刃２２の突出方向のなす角であり、例えば６５°である。 FIG. 3A is a top view of the inner cutter 20, and FIG. 3B is a side view of the inner cutter 20. As shown in these figures, the plurality of small blades 22 are arranged in two rows along the circumference of the base 21. The inner row corresponds to the slits 11c and 11d of the outer blade 10, and has a configuration in which seven small blades 22 are arranged at equal intervals. The outer row corresponds to the slits 11a and 11b of the outer blade 10, and has a configuration in which 14 small blades 22 are arranged at equal intervals. Each of the small blades 22 is formed so as to project obliquely at an angle θ from the surface of the base 21. θ is the angle between the rotation direction R2 and the direction in which the small blade 22 projects, and is, for example, 65 °.
　各小刃２２は、円形のステンレスに略Ｕ字型の溝を形成し、その結果として形成される先端に鍛造加工及び平滑化加工を用いて刃先（後述する一次刃２３ａ及び二次刃２３ｂ）を形成した後、小刃２２の根元に相当する部分を角度θまで折り曲げることにより形成される。このうち一次刃２３ａ及び二次刃２３ｂの形成方法については、後ほどより詳しく説明する。一次刃２３ａ及び二次刃２３ｂはそれぞれ、図３（ａ）（ｂ）から理解されるように、回転方向Ｒ２に対して直交する直線状に形成される。 Each of the small blades 22 forms a substantially U-shaped groove in a circular stainless steel, and uses a forging process and a smoothing process on a tip formed as a result thereof to form a cutting edge (a primary blade 23a and a secondary blade 23b described later). Is formed, a portion corresponding to the root of the small blade 22 is bent to an angle θ. The method of forming the primary blade 23a and the secondary blade 23b will be described later in more detail. As understood from FIGS. 3A and 3B, the primary blade 23a and the secondary blade 23b are each formed in a straight line orthogonal to the rotation direction R2.
　図４は、スリット１１ａを上側からマイクロスコープで観測した結果を模式的に示す図である。上述したように、スリット１１ａは半径方向に対して傾斜するとともに湾曲形状を有しているため、マイクロスコープで見ると、スリット１１ａの内壁（及びその下端に形成される刃先）と小刃２２の刃先とは平行ではなく、図４に示すように斜交している。これにより、外刃１０が回転方向Ｒ１に、内刃２０が回転方向Ｒ２にそれぞれ回転すると、小刃２２の刃先（具体的には、二次刃２３ｂ）とスリット１１ａの下端に形成された刃先（後述する図５（ｂ）に示す刃先１２）とが共有中心軸寄りの端部から徐々に重なり合い、結果として、はさみのような切断が実現される。スリット１１ｂ～１１ｄについても同様である。 FIG. 4 is a view schematically showing the result of observing the slit 11a from above with a microscope. As described above, since the slit 11a is inclined with respect to the radial direction and has a curved shape, when viewed with a microscope, the inner wall of the slit 11a (and the cutting edge formed at the lower end thereof) and the small blade 22 are formed. The cutting edge is not parallel, but is oblique as shown in FIG. Thus, when the outer blade 10 rotates in the rotation direction R1 and the inner blade 20 rotates in the rotation direction R2, the cutting edge of the small blade 22 (specifically, the secondary blade 23b) and the cutting edge formed at the lower end of the slit 11a. (A cutting edge 12 shown in FIG. 5B described later) gradually overlaps from the end near the shared central axis, and as a result, cutting like scissors is realized. The same applies to the slits 11b to 11d.
　図５（ａ）は、回転式シェーバー１の断面を示す図である。同図には、切断対象となるユーザの髭Ｈも図示している。また、図５（ｂ）は、図５（ａ）をスリット１１の付近で拡大してなる図である。これらの図には、１つの小刃２２及びスリット１１のみを示しており、以下では、図示した小刃２２及びスリット１１に着目して説明を続けるが、他の小刃２２及びスリット１１についても同様である。 FIG. 5A is a diagram showing a cross section of the rotary shaver 1. FIG. 2 also shows a beard H of the user to be cut. FIG. 5B is an enlarged view of FIG. 5A near the slit 11. In these figures, only one blade 22 and slit 11 are shown. In the following, the description will be continued focusing on the illustrated blade 22 and slit 11, but the other blade 22 and slit 11 will be described. The same is true.
　図５（ａ）に示すように、小刃２２は、互いに分離して設けられた一次刃２３ａ（第１の刃先）及び二次刃２３ｂ（第２の刃先）を有して構成される。このうち二次刃２３ｂは、図５（ｂ）に示すように、小刃２２の上面２２ａの回転方向Ｒ２の先端に角度θで形成される。一方、一次刃２３ａは、二次刃２３ｂに比べ、基台２１に近く、かつ、回転方向Ｒ２に見て前方の位置に、９０度で形成される。なお、回転方向Ｒ２に見て前方の位置とは、図示した一次刃２３ａの円周方向の位置Ｔａが二次刃２３ｂの円周方向の位置Ｔｂよりも回転方向Ｒ２に見て前方にあることを意味する。 小 As shown in FIG. 5A, the small blade 22 includes a primary blade 23a (first blade) and a secondary blade 23b (second blade) provided separately from each other. The secondary blade 23b is formed at an angle θ at the tip of the upper surface 22a of the small blade 22 in the rotation direction R2, as shown in FIG. 5B. On the other hand, the primary blade 23a is formed at a position closer to the base 21 and at a position 90 degrees ahead of the secondary blade 23b when viewed in the rotation direction R2. The position forward in the rotation direction R2 means that the position Ta in the circumferential direction of the illustrated primary blade 23a is ahead of the position Tb in the circumferential direction of the secondary blade 23b in the rotation direction R2. Means
　一次刃２３ａ及び二次刃２３ｂの形成方法について、詳しく説明する。一次刃２３ａ及び二次刃２３ｂは、一体のステンレスを鍛造により成形した後、小刃２２の上面２２ａを平滑化することによって形成される。鍛造による成形は、小刃２２の回転方向Ｒ２に見て前方に位置する表面２２ｂのうち隣接する２つの領域Ａ１，Ａ２を、鍛造により互いに異なる深さで押し込むことによって実行される。 形成 A method for forming the primary blade 23a and the secondary blade 23b will be described in detail. The primary blade 23a and the secondary blade 23b are formed by forming an integral stainless steel by forging and then smoothing the upper surface 22a of the small blade 22. Forming by forging is performed by forging two adjacent areas A1 and A2 of the surface 22b located forward in the rotation direction R2 of the small blade 22 at different depths by forging.
　より具体的に説明すると、領域Ａ２は、鍛造・平滑化前の表面２２ｂの上側エッジを１辺とする長方形の領域である。領域Ａ１は、長方形である領域Ａ２の下側の辺（上記上側エッジである辺と対向する１辺）を１辺とする長方形の領域である。鍛造工程では、金型により、領域Ａ２を深さＤ２で、領域Ａ１を深さＤ２より浅い深さＤ１で、それぞれ表面２２ｂに対して垂直に押し込む。こうすることにより、まず領域Ａ１と領域Ａ２の境界に一次刃２３ａが形成される。 More specifically, the region A2 is a rectangular region having the upper edge of the surface 22b before forging / smoothing as one side. The area A1 is a rectangular area having one side on the lower side of the rectangular area A2 (one side opposed to the above-described upper edge). In the forging process, the region A2 is pressed into the depth D2 and the region A1 is pressed at a depth D1 shallower than the depth D2 perpendicularly to the surface 22b. By doing so, first, the primary blade 23a is formed at the boundary between the region A1 and the region A2.
　なお、この段階で、一見すると一次刃２３ａに類似した形状を有するように見えるエッジ２３ｃが領域Ａ１の下側に形成されるが、現実の鍛造工程ではエッジ２３ｃをシャープに形成することは難しいので、エッジ２３ｃに刃先としての機能を期待することはできない。別の言い方をすれば、一次刃２３ａを形成するためには、上記のように２段階の深さを用いた鍛造が必須である。 At this stage, an edge 23c that appears to have a shape similar to the primary blade 23a at first glance is formed below the region A1, but it is difficult to form the edge 23c sharply in an actual forging process. The edge 23c cannot be expected to function as a cutting edge. Stated another way, in order to form the primary blade 23a, forging using the two-step depth as described above is essential.
　一次刃２３ａの回転方向Ｒ２の位置は、エッジ２３ｃのそれに比べて前方に設定される。すなわち、一次刃２３ａの形成は、図示した一次刃２３ａの円周方向の位置Ｔａがエッジ２３ｃの円周方向の位置Ｔｃよりも回転方向Ｒ２に見て前方となるように、実行される。これは、形状の定まらないエッジ２３ｃが髭Ｈに接触する前に、一次刃２３ａを髭Ｈに接触させるためである。 位置 The position of the primary blade 23a in the rotation direction R2 is set ahead of the edge 23c. That is, the formation of the primary blade 23a is performed such that the circumferential position Ta of the illustrated primary blade 23a is ahead of the circumferential position Tc of the edge 23c when viewed in the rotation direction R2. This is because the primary blade 23a is brought into contact with the beard H before the edge 23c whose shape is not determined comes into contact with the beard H.
　鍛造工程の後には、小刃２２の上面２２ａの平滑化を実行する。このとき、上面２２ａと小刃２２の表面２２ｂとが角度θをなすように、上面２２ａの平滑化を行う。これにより、角度θの二次刃２３ｂが形成されるとともに、最終的に（小刃２２の根元を角度θまで折り曲げた後）、上面２２ａが基台２１及び外刃１０の下面と平行になる。なお、平滑化工程は、小刃２２の根元を折り曲げた後に実行することとしてもよい。 After the forging process, the upper surface 22a of the small blade 22 is smoothed. At this time, the upper surface 22a is smoothed so that the upper surface 22a and the surface 22b of the small blade 22 form an angle θ. Thereby, the secondary blade 23b having the angle θ is formed, and finally (after the root of the small blade 22 is bent to the angle θ), the upper surface 22a is parallel to the base 21 and the lower surface of the outer blade 10. . Note that the smoothing step may be performed after the root of the small blade 22 is bent.
　ここで、平滑化は、小刃２２の上面２２ａの形状を外刃１０の下面に沿った形状にする（すなわち、小刃２２の上面２２ａと外刃１０の下面との間のクリアランスが一定になるようにする）ためのもので、典型的には研磨によって実行される。ただし、外刃１０の下面が曲面となっている場合などには、研磨に代えて放電加工を用いてもよい。すなわち、外刃１０の下面の形状に応じた形状を有する形状電極を形成し、この形状電極を用いて放電加工を行うことにより、外刃１０の下面の形状を小刃２２の上面２２ａに転写することとしてもよい。 Here, in the smoothing, the shape of the upper surface 22a of the small blade 22 is formed along the lower surface of the outer blade 10 (that is, the clearance between the upper surface 22a of the small blade 22 and the lower surface of the outer blade 10 is constant). And is typically performed by polishing. However, when the lower surface of the outer cutter 10 is a curved surface or the like, electric discharge machining may be used instead of polishing. That is, a shape electrode having a shape corresponding to the shape of the lower surface of the outer blade 10 is formed, and the shape of the lower surface of the outer blade 10 is transferred to the upper surface 22a of the small blade 22 by performing electric discharge machining using the shape electrode. You may do it.
　以下、引き続き図５（ａ）（ｂ）を参照しながら、本発明による回転式シェーバー１及びその内刃２０により奏される効果について、詳しく説明する。 Hereinafter, the effects provided by the rotary shaver 1 and the inner blade 20 thereof according to the present invention will be described in detail with reference to FIGS. 5 (a) and 5 (b).
　ユーザが回転式シェーバー１を使用する場合、図５（ａ）に示すように、ユーザの髭Ｈがスリット１１内に入り込んだ状態となる。この状態で上述した制御回路の制御により内刃２０及び外刃１０のそれぞれが回転すると、まず一次刃２３ａが髭Ｈに食い込み、髭Ｈを図示した方向Ｃ（下方向）に引き下げる。次いで二次刃２３ｂ及び外刃１０の刃先１２が髭Ｈを切断し始めると、一度引き下げた髭Ｈを戻そうとする肌の力により、内刃２０が図示した方向Ｄ（上方向）に持ち上げられ、その結果として内刃２０と外刃１０が密着する。したがって、本発明による回転式シェーバー１によれば、内刃２０と外刃１０の間に図６に示したようなギャップが生じない。 When the user uses the rotary shaver 1, the user's beard H enters the slit 11 as shown in FIG. In this state, when each of the inner blade 20 and the outer blade 10 rotates under the control of the control circuit described above, the primary blade 23a first bites into the beard H, and pulls down the beard H in the illustrated direction C (downward). Next, when the secondary blade 23b and the blade edge 12 of the outer blade 10 start cutting the beard H, the inner blade 20 is lifted in the illustrated direction D (upward) by the force of the skin to return the beard H once lowered. As a result, the inner cutter 20 and the outer cutter 10 come into close contact with each other. Therefore, according to the rotary shaver 1 of the present invention, a gap as shown in FIG. 6 does not occur between the inner cutter 20 and the outer cutter 10.
　加えて、本発明による回転式シェーバー１によれば、鍛造と平滑化によって一次刃２３ａ及び二次刃２３ｂを形成しているので、一次刃２３ａ及と二次刃２３ｂの間の回転方向の距離（＝Ｔａ－Ｔｂ）を小さくすることができる。その結果、一次刃２３ａが髭を引っ張り過ぎ、髭が倒れてしまうことを防止できるので、剃り味の改善された回転式シェーバー及びその内刃を提供することが可能になる。また、ユーザに痛みを感じさせてしまうことも防止できる。 In addition, according to the rotary shaver 1 of the present invention, since the primary blade 23a and the secondary blade 23b are formed by forging and smoothing, the distance in the rotational direction between the primary blade 23a and the secondary blade 23b. (= Ta−Tb) can be reduced. As a result, it is possible to prevent the primary blade 23a from pulling the beard too much and the beard from falling down, so that it is possible to provide a rotary shaver with improved shaving taste and an inner blade thereof. Also, it is possible to prevent the user from feeling pain.
　また、本発明による回転式シェーバー１によれば、一体のステンレスを用いて小刃２２を形成しているので、高い耐久性を得ることができる。 According to the rotary shaver 1 of the present invention, since the small blades 22 are formed using integral stainless steel, high durability can be obtained.
　さらに、本発明による回転式シェーバー１によれば、各小刃２２の回転方向Ｒ２に見て前方に位置する表面２２ｂのうち隣接する２つの領域Ａ１，Ａ２を、鍛造により互いに異なる深さＤ１，Ｄ２で押し込むことによって一次刃２３ａを形成するので、図５（ｂ）に示したエッジ２３ｃを一次刃とする場合に比べ、一次刃２３ａを高精度に形成することが可能になる。 Furthermore, according to the rotary shaver 1 according to the present invention, two adjacent areas A1 and A2 of the front surface 22b positioned forward in the rotation direction R2 of each of the small blades 22 are forged to different depths D1 and D1. Since the primary blade 23a is formed by pushing in with D2, the primary blade 23a can be formed with higher precision than when the edge 23c shown in FIG. 5B is used as the primary blade.
　以上、本発明の好ましい実施の形態について説明したが、本発明はこうした実施の形態に何等限定されるものではなく、本発明が、その要旨を逸脱しない範囲において、種々なる態様で実施され得ることは勿論である。 As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to these embodiments at all, and the present invention can be implemented in various modes without departing from the gist thereof. Of course.
１　　　　回転式シェーバー
２　　　　本体
３　　　　ヘッド部
４　　　　電源ボタン
１０　　　外刃
１１，１１ａ～１１ｄ　スリット
１２　　　外刃１０の刃先
２０　　　内刃
２１　　　基台
２２　　　小刃
２２ａ　　小刃２２の上面
２２ｂ　　小刃２２の表面
２３ａ　　一次刃
２３ｂ　　二次刃
２３ｃ　　エッジ
Ｈ　　　　ユーザの髭 DESCRIPTION OF SYMBOLS 1 Rotary shaver 2 Main body 3 Head part 4 Power button 10 Outer blade 11, 11a-11d Slit 12 Blade edge 20 of outer blade 10 Inner blade 21 Base 22 Small blade 22a Upper surface 22b of small blade 22 Surface 23a of small blade 22 Primary Blade 23b Secondary blade 23c Edge H User's beard

Claims (4)

  1. 　表面に複数のスリットが設けられた円盤状の外刃と、
    　前記外刃の中心軸を回転軸として前記外刃に対して相対的に回転可能に構成された内刃と、を備え、
    　前記外刃は、前記複数のスリットそれぞれの内壁の下端に刃先を有し、
    　前記内刃は、円盤状の基台と、該基台から外刃に向かって斜めに突出する複数の小刃と、を有し、
    　前記複数の小刃はそれぞれ、互いに分離して設けられた第１及び第２の刃先を有し、
    　前記第２の刃先は、対応する前記小刃の上面の回転方向の先端に設けられ、
    　前記第１の刃先は、前記第２の刃先に比べ、前記基台に近く、かつ、前記回転方向に見て前方の位置に設けられ、
    　前記第１及び第２の刃先は、一体のステンレスを鍛造により成形した後、対応する前記上面を平滑化することによって形成され、
    　前記成形は、鍛造・平滑化前の前記小刃の回転方向に見て前方に位置する第１の表面の上側エッジを１辺とする前記第１の表面内の長方形の領域である第２の領域を、鍛造により、前記第１の表面に対して垂直に第２の深さで押し込むとともに、前記第２の領域の下側の辺を１辺とする前記第１の表面内の長方形の領域である第１の領域を、鍛造により、前記第１の表面に対して垂直に前記第２の深さより浅い第１の深さで押し込むことによって実行され、
    　前記第１の刃先は、前記第１の領域と前記第２の領域の境界に形成される、
    　回転式シェーバー。     A disk-shaped outer blade having a plurality of slits on its surface,
    An inner blade configured to be rotatable relative to the outer blade with the center axis of the outer blade as a rotation axis,
    The outer blade has a cutting edge at the lower end of the inner wall of each of the plurality of slits,
    The inner blade has a disk-shaped base, and a plurality of small blades projecting obliquely from the base toward the outer blade,
    Each of the plurality of small blades has first and second cutting edges provided separately from each other,
    The second cutting edge is provided at a tip in the rotational direction of the upper surface of the corresponding small blade,
    The first cutting edge is provided closer to the base than the second cutting edge, and is provided at a position forward in the rotation direction.
    The first and second cutting edges are formed by forming an integral stainless steel by forging and then smoothing the corresponding upper surface,
    The molding is a rectangular region in the first surface having one side as an upper edge of the first surface positioned forward in the rotation direction of the blade before forging / smoothing. A region is pressed into the region at a second depth perpendicular to the first surface by forging, and a rectangular region in the first surface having a lower side as one side. By forging, by forging, at a first depth shallower than said second depth, perpendicular to said first surface,
    The first cutting edge is formed at a boundary between the first region and the second region.
    Rotary shaver.
  2. 　前記第１の刃先は９０度に形成され、
    　前記第２の刃先は前記第１の刃先より小さい角度に形成される、
    　請求項１に記載の回転式シェーバー。     The first cutting edge is formed at 90 degrees,
    The second cutting edge is formed at an angle smaller than the first cutting edge;
    The rotary shaver according to claim 1.
  3. 　前記平滑化は、研磨、あるいは、前記外刃の下面の形状を放電加工によって前記上面に転写することによって実行される、
    　請求項１又は２に記載の回転式シェーバー。     The smoothing is performed by polishing, or transferring the shape of the lower surface of the outer blade to the upper surface by electric discharge machining,
    The rotary shaver according to claim 1.
  4. 　表面に設けられた複数のスリットそれぞれの内壁の下端に刃先を有する円盤状の外刃の中心軸を回転軸として前記外刃に対して相対的に回転可能に構成された回転式シェーバーの内刃であって、
    　円盤状の基台と、
    　該基台から外刃に向かって斜めに突出する複数の小刃と、を備え、
    　前記複数の小刃はそれぞれ、互いに分離して設けられた第１及び第２の刃先を有し、
    　前記第２の刃先は、対応する前記小刃の上面の回転方向の先端に設けられ、
    　前記第１の刃先は、前記第２の刃先に比べ、前記基台に近く、かつ、前記回転方向に見て前方の位置に設けられ、
    　前記第１及び第２の刃先は、一体のステンレスを鍛造により成形した後、対応する前記上面を平滑化することによって形成され、
    　前記成形は、鍛造・平滑化前の前記小刃の回転方向に見て前方に位置する第１の表面の上側エッジを１辺とする前記第１の表面内の長方形の領域である第２の領域を、鍛造により、前記第１の表面に対して垂直に第２の深さで押し込むとともに、前記第２の領域の下側の辺を１辺とする前記第１の表面内の長方形の領域である第１の領域を、鍛造により、前記第１の表面に対して垂直に前記第２の深さより浅い第１の深さで押し込むことによって実行され、
    　前記第１の刃先は、前記第１の領域と前記第２の領域の境界に形成される、
    　回転式シェーバーの内刃。     An inner blade of a rotary shaver configured to be rotatable relative to the outer blade around a central axis of a disk-shaped outer blade having a blade edge at a lower end of each of a plurality of slits provided on the surface. And
    A disk-shaped base,
    A plurality of small blades projecting obliquely from the base toward the outer blade,
    Each of the plurality of small blades has first and second cutting edges provided separately from each other,
    The second cutting edge is provided at a tip in the rotational direction of the upper surface of the corresponding small blade,
    The first cutting edge is provided closer to the base than the second cutting edge, and is provided at a position forward in the rotation direction.
    The first and second cutting edges are formed by forming an integral stainless steel by forging and then smoothing the corresponding upper surface,
    The molding is a rectangular region in the first surface having one side as an upper edge of the first surface positioned forward in the rotation direction of the blade before forging / smoothing. A region is pressed into the region at a second depth perpendicular to the first surface by forging, and a rectangular region in the first surface having a lower side as one side. By forging, by forging, at a first depth shallower than said second depth, perpendicular to said first surface,
    The first cutting edge is formed at a boundary between the first region and the second region.
    Inner blade of rotary shaver.
PCT/JP2019/030017 2018-08-23 2019-07-31 Rotating shaver and inner blade of same WO2020039867A1 (en)

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Publication number Priority date Publication date Assignee Title
CN113146690A (en) * 2021-05-24 2021-07-23 王开永 Shaver head

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JPS53115368A (en) * 1977-03-18 1978-10-07 Sharp Corp Electric shaver
JPS5542692A (en) * 1978-09-18 1980-03-26 Philips Nv Shaving device
JPS5850982A (en) * 1981-09-11 1983-03-25 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Razor device
JP2005349465A (en) * 2004-06-14 2005-12-22 Matsushita Electric Works Ltd Blade with notch and its production method
JP2008517695A (en) * 2004-11-01 2008-05-29 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Cutter unit for rotary shaver, method for manufacturing such unit, and rotary shaver including the same
JP2013107088A (en) * 2011-11-17 2013-06-06 Panasonic Corp Cutting blade and method of manufacturing the cutting blade
JP2015071002A (en) * 2013-10-04 2015-04-16 株式会社泉精器製作所 Inner blade of rotary electric razor
JP2017086133A (en) * 2015-11-02 2017-05-25 株式会社泉精器製作所 Rotary type electric razor

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JPS53115368A (en) * 1977-03-18 1978-10-07 Sharp Corp Electric shaver
JPS5542692A (en) * 1978-09-18 1980-03-26 Philips Nv Shaving device
JPS5850982A (en) * 1981-09-11 1983-03-25 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Razor device
JP2005349465A (en) * 2004-06-14 2005-12-22 Matsushita Electric Works Ltd Blade with notch and its production method
JP2008517695A (en) * 2004-11-01 2008-05-29 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Cutter unit for rotary shaver, method for manufacturing such unit, and rotary shaver including the same
JP2013107088A (en) * 2011-11-17 2013-06-06 Panasonic Corp Cutting blade and method of manufacturing the cutting blade
JP2015071002A (en) * 2013-10-04 2015-04-16 株式会社泉精器製作所 Inner blade of rotary electric razor
JP2017086133A (en) * 2015-11-02 2017-05-25 株式会社泉精器製作所 Rotary type electric razor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113146690A (en) * 2021-05-24 2021-07-23 王开永 Shaver head

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