WO2020039867A1 - Rotating shaver and inner blade of same - Google Patents
Rotating shaver and inner blade of same Download PDFInfo
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- 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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- blade
- cutting edge
- forging
- region
- outer blade
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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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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
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.
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.
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 OFSYMBOLS 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
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
Claims (4)
- 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. - 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. - 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. - 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.
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2018
- 2018-08-23 JP JP2018156433A patent/JP6482149B1/en active Active
-
2019
- 2019-07-31 WO PCT/JP2019/030017 patent/WO2020039867A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113146690A (en) * | 2021-05-24 | 2021-07-23 | 王开永 | Shaver head |
Also Published As
Publication number | Publication date |
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JP6482149B1 (en) | 2019-03-13 |
JP2020028500A (en) | 2020-02-27 |
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