JP6579913B2

JP6579913B2 - Rotating blade and small electric device equipped with the rotating blade

Info

Publication number: JP6579913B2
Application number: JP2015209899A
Authority: JP
Inventors: 岩倉　幸太郎; 幸太郎岩倉
Original assignee: Maxell Holdings Ltd
Current assignee: Maxell Ltd
Priority date: 2015-10-26
Filing date: 2015-10-26
Publication date: 2019-09-25
Anticipated expiration: 2035-10-26
Also published as: JP2017079933A

Description

本発明は、切断対象を回転しながら切断する回転刃と、回転刃を備えている小型電気機器に関する。回転刃は、ロータリー式の電気かみそりの内刃や、爪やかかと等の角質を除去する角質削り器の減削刃として適用できる。 The present invention relates to a rotary blade that cuts while cutting an object to be cut, and a small electric device including the rotary blade. The rotary blade can be used as an internal blade of a rotary electric razor or a cutting blade of a keratin sharpener that removes keratin such as nails and heels.

ロータリー式の電気かみそりの内刃には、エッチング加工で形成された部分網刃を切断要素とする網刃型の内刃と、螺旋状にプレス成形されたブレードを切断要素とするブレード型の内刃と、本発明の回転刃と同様に、棒状の金属材に切削加工と研削加工を施して、軸部と切刃を一体に形成した一体型の内刃（特許文献１）などがある。特許文献１の内刃の切刃は、内凹み状に湾曲するすくい面と、外膨らみ状に湾曲する刃先面（逃げ面）で断面が千鳥状に形成してある。 The inner blade of a rotary electric razor includes a blade-type inner blade whose cutting element is a partial mesh blade formed by etching, and a blade-type inner blade whose cutting element is a spirally press-formed blade. Similar to the blade and the rotary blade of the present invention, there is an integrated inner blade (Patent Document 1) in which a rod-shaped metal material is cut and ground to integrally form a shaft portion and a cutting blade. The cutting blade of the inner blade of Patent Document 1 is formed in a staggered cross section with a rake surface that curves in an inner dent shape and a cutting edge surface (flank surface) that curves in an outer bulge shape.

本発明に係る回転刃においては、鋭角の切刃をすくい面と刃先面などで構成するが、この種の回転刃は、例えば特許文献２のリーマ（切削工具）に見ることができる。そこでは、切刃の刃先に連続する刃先面を、第１刃先面と第２刃先面で構成している。 In the rotary blade according to the present invention, an acute angle cutting blade is constituted by a rake face and a cutting edge surface. This type of rotary blade can be found in, for example, a reamer (cutting tool) of Patent Document 2. In this case, the cutting edge surface continuous with the cutting edge of the cutting edge is constituted by a first cutting edge surface and a second cutting edge surface.

実開平０２−６７９６９号公報（８頁１７行〜９頁２行、第２図）Japanese Utility Model Publication No. 02-67969 (page 8, line 17 to page 9, line 2, Fig. 2) 特開２００２−２２４９１３号公報（段落番号０００７、図２）Japanese Patent Laid-Open No. 2002-224913 (paragraph number 0007, FIG. 2)

特許文献１に係る一体型の内刃は、棒状の金属材を形成素材とするので、網刃型やブレード型の内刃に比べて重量が最も大きく、切断抵抗が大きな剛毛であっても大きな回転慣性力で適確に切断できる。また、切刃の剛性が高く耐久性に優れている利点もある。しかし、切刃のすくい角が刃先角に比べて小さいため、鋭い切れ味でひげ切断を行って、軽快なひげ剃り感を発揮するのが難しい。すくい角を刃先角より大きくし、さらに切刃の刃先厚みを薄くすると鋭い切れ味が得られるが、短期間で刃先が損耗して切れ味が急激に低下するうえ、落下衝撃を受けるような場合に切刃が破損しやすくなる。また、すくい面や刃先面の加工に多くの手間が掛かり、内刃の全体コストが嵩みやすい。 The integrated inner blade according to Patent Document 1 uses a rod-shaped metal material as a forming material. Therefore, even if the bristles have the largest weight and the cutting resistance is larger than that of the inner blade of a blade type or a blade type. Can be cut accurately with rotational inertia. In addition, there is an advantage that the cutting blade has high rigidity and excellent durability. However, since the rake angle of the cutting edge is smaller than the cutting edge angle, it is difficult to perform a beard cutting with a sharp sharpness and exert a light shaving feeling. If the rake angle is made larger than the cutting edge angle and the cutting edge thickness is further reduced, a sharp cutting edge can be obtained.However, the cutting edge is worn out in a short period of time and the cutting edge sharply decreases. The blade is easily damaged. In addition, it takes a lot of work to process the rake face and the edge surface, and the overall cost of the inner blade tends to increase.

特許文献２のリーマでは、刃先面を第１刃先面と第２刃先面で構成するので、切刃の強度を充分に確保して耐久性を確保できる。しかし、特許文献１に係る一体型の内刃と同様に、切刃のすくい角が刃先角に比べて小さいため、これをロータリー式の電気かみそりの内刃に適用したとしても、ひげ切断時に鋭い切れ味を発揮することは難しい。 In the reamer of Patent Document 2, the cutting edge surface is constituted by the first cutting edge surface and the second cutting edge surface, so that the strength of the cutting edge can be sufficiently ensured and the durability can be ensured. However, since the rake angle of the cutting edge is smaller than the edge angle, as with the integrated inner blade according to Patent Document 1, even when this is applied to the inner blade of a rotary electric shaver, it is sharp at the time of cutting the beard. It is difficult to demonstrate the sharpness.

本発明の目的は、一体型の回転刃において切断対象を鋭い切れ味で軽快に切断でき、しかも、切刃の剛性を向上して長期にわたって鋭い切れ味を維持できる耐久性に優れた回転刃を提供することにある。
本発明の目的は、回転刃と、回転刃を回転駆動する駆動手段を備えていて、切断対象を鋭い切れ味で軽快に切断でき、しかも、切刃の剛性を向上して、長期にわたって鋭い切れ味を維持できる回転刃を備えた小型電気機器を提供することにある。 An object of the present invention is to provide a rotary blade excellent in durability that can cut a cutting object with a sharp sharpness and lightness with an integrated rotary blade, and that can improve the rigidity of the cutting blade and maintain a sharp sharpness over a long period of time. There is.
The object of the present invention is to provide a rotary blade and a drive means for rotationally driving the rotary blade, so that the cutting object can be cut lightly with a sharp sharpness, and further, the rigidity of the cutting blade is improved and the sharpness is sharpened over a long period of time. An object of the present invention is to provide a small electric device having a rotating blade that can be maintained.

本発明に係る回転刃は、軸部３１と複数個の切刃３２を備えている。図１に示すように、軸部３１の回転中心と切刃３２の刃先４０を通る基準線Ｘと、刃先４０を通る刃先接線Ｙと、刃先４０および第１刃部４１のすくい面４４を通るすくい角線Ｐを想定するとき、基準線Ｘとすくい角線Ｐで挟むすくい角度ｂが、刃先面４７とすくい角線Ｐで挟む刃先角度ａより大きく設定してあることを特徴とする。 The rotary blade according to the present invention includes a shaft portion 31 and a plurality of cutting blades 32. As shown in FIG. 1, the reference line X passing through the rotation center of the shaft 31 and the cutting edge 40 of the cutting edge 32, the cutting edge tangent Y passing through the cutting edge 40, and the rake face 44 of the cutting edge 40 and the first cutting edge 41. When the rake angle line P is assumed, the rake angle b sandwiched between the reference line X and the rake angle line P is set to be larger than the blade edge angle a sandwiched between the edge surface 47 and the rake angle line P.

軸部３１の周囲に複数個の切刃３２を一体に形成する。切刃３２は、刃先４０を含む第１刃部４１と、第１刃部４１に連続する第２刃部４２を備えている。すくい角線Ｐと第２刃部４２の第２刃先面４８で挟む第２刃部角度ａ１は、すくい角度ｂと同じか、これより小さく設定してある。 A plurality of cutting blades 32 are integrally formed around the shaft portion 31. The cutting blade 32 includes a first blade portion 41 including a blade edge 40 and a second blade portion 42 that is continuous with the first blade portion 41. The second blade portion angle a1 sandwiched between the rake angle line P and the second blade edge surface 48 of the second blade portion 42 is set to be equal to or smaller than the rake angle b.

切刃３２は、第１刃部４１と、第２刃部４２と、第２刃部４２に連続する第３刃部４３を備えている。第３刃部４３は、第２刃先面４８に連続する第３刃先面４９と、第１刃部４１のすくい面４４に連続する基部すくい面４５を備えている。第３刃先面４９と基部すくい面４５に挟まれる第３刃部角度ａ２は、すくい角度ｂと同じか、これより小さく設定してある。 The cutting blade 32 includes a first blade portion 41, a second blade portion 42, and a third blade portion 43 that is continuous with the second blade portion 42. The third blade portion 43 includes a third blade edge surface 49 that is continuous with the second blade edge surface 48 and a base rake surface 45 that is continuous with the rake surface 44 of the first blade portion 41. The third blade angle a2 between the third blade edge surface 49 and the base rake face 45 is set to be equal to or smaller than the rake angle b.

すくい角度ｂは４５度以上に設定する。 The rake angle b is set to 45 degrees or more.

刃先角度ａと、第２刃部角度ａ１と、第３刃部角度ａ２は、不等式（ａ１＜ａ＜ａ２）を満足するように設定する。 The blade edge angle a, the second blade portion angle a1, and the third blade portion angle a2 are set so as to satisfy the inequality (a1 <a <a2).

刃先角度ａとすくい角度ｂの合計角度は９０度前後に設定する。 The total angle of the blade edge angle a and the rake angle b is set to around 90 degrees.

第２刃部４２の第２刃先面４８は、刃先接線Ｙと第２刃先面４８に挟まれる逃げ角度ｃの分だけ、刃先接線Ｙから軸部３１に近接する向きに下り傾斜させてある。 The second cutting edge surface 48 of the second cutting edge portion 42 is inclined downward from the cutting edge tangent Y in a direction approaching the shaft portion 31 by the clearance angle c sandwiched between the cutting edge tangent Y and the second cutting edge surface 48.

第２刃先面４８と刃先接線Ｙに挟まれる逃げ角度をｃとするとき、逃げ角度ｃと、第２刃部角度ａ１と、すくい角度ｂの３者は、不等式（ｃ＜ａ１＜＝ｂ）を満足するように設定する。 When the clearance angle between the second blade edge surface 48 and the blade edge tangent line Y is c, the three of the clearance angle c, the second blade angle a1, and the rake angle b are inequality (c <a1 <= b). Set to satisfy.

図９に示すように、第１刃部４１の刃先４０と第２刃部４２の第２刃先面４８の間に、刃先接線Ｙから軸部３１に近接する向きに下り傾斜する刃先面４７を形成する。 As shown in FIG. 9, a cutting edge surface 47 that slopes downward from the cutting edge tangent Y in the direction approaching the shaft section 31 between the cutting edge 40 of the first cutting edge portion 41 and the second cutting edge surface 48 of the second cutting edge portion 42. Form.

切断対象を固定切断刃１７と協同して切断する回転刃１６において、回転刃１６の刃先４０を軸部３１の軸心方向に沿って連続して形成する。刃先４０の軸心方向の両端に、固定切断刃１７との接触を避ける刃先隅部５０を形成する。 In the rotary blade 16 that cuts the cutting target in cooperation with the fixed cutting blade 17, the cutting edge 40 of the rotary blade 16 is continuously formed along the axial direction of the shaft portion 31. Cutting edge corners 50 that avoid contact with the fixed cutting blade 17 are formed at both ends of the cutting edge 40 in the axial direction.

本発明における小型電気機器は、上記の回転刃１６と、回転刃１６を回転駆動する駆動手段を備えている。 A small electric apparatus according to the present invention includes the rotary blade 16 and a driving unit that rotationally drives the rotary blade 16.

本発明においては、軸部３１と切刃３２を備えた回転刃１６において、基準線Ｘとすくい角線Ｐで挟むすくい角度ｂを、刃先面４７とすくい角線Ｐで挟む刃先角度ａより大きく設定するようにした。このように、すくい角度ｂを刃先角度ａより大きく設定すると、刃先４０の角度を小さくできるので、刃先角度ａがすくい角度ｂより大きく設定してある場合に比べて、切刃３２の切れ味をシャープで鋭いものとすることができる。 In the present invention, in the rotary blade 16 having the shaft portion 31 and the cutting edge 32, the rake angle b sandwiched between the reference line X and the rake angle line P is larger than the blade edge angle a sandwiched between the edge surface 47 and the rake angle line P. I set it. Thus, if the rake angle b is set larger than the cutting edge angle a, the angle of the cutting edge 40 can be reduced, so that the sharpness of the cutting edge 32 is sharper than when the cutting edge angle a is set larger than the rake angle b. Can be sharp.

第２刃部角度ａ１を、すくい角度ｂと同じか、これより小さく設定すると、刃先４０から刃溝４６に至る間の切刃３２の外形線を大きく抉られた形状にして、先の外形線と基準線Ｘにはさまれる空間を大きくすることができる。また、切刃３２の刃先４０で切断された直後の切断対象を、大きく抉られたすくい面４４の側へ案内して刃先４０から速やかに遠ざけることができるので、切断対象が刃先４０の近傍に溜まるのを解消して、切断対象を的確に切断できる。さらに、第１刃部４１と、第１刃部４１に連続する第２刃部４２で切刃３２を構成して、刃先４０を含む第１刃部４１の構造強度を第２刃部４２で増強するので、単に切刃の刃先厚みを薄くした回転刃に比べて、切刃３２の剛性を向上できる。従って、長期にわたって鋭い切れ味を維持でき、しかも落下衝撃を受けても破損しにくい耐久性に優れた回転刃１６を提供できる。 When the second blade angle a1 is set to be equal to or smaller than the rake angle b, the outer contour line of the cutting blade 32 from the blade tip 40 to the blade groove 46 is greatly sharpened, and the previous outer contour line And the space between the reference line X can be increased. Further, since the cutting object immediately after being cut by the cutting edge 40 of the cutting edge 32 can be guided to the side of the rake face 44 that is greatly scooped and quickly moved away from the cutting edge 40, the cutting object is brought close to the cutting edge 40. It is possible to eliminate the accumulation and accurately cut the object to be cut. Furthermore, the cutting blade 32 is constituted by the first blade portion 41 and the second blade portion 42 that is continuous with the first blade portion 41, and the structural strength of the first blade portion 41 including the blade edge 40 is determined by the second blade portion 42. Since it is strengthened, the rigidity of the cutting blade 32 can be improved compared to a rotating blade in which the cutting edge thickness of the cutting blade is simply reduced. Therefore, it is possible to provide the rotary blade 16 having excellent durability that can maintain a sharp sharpness for a long period of time and is not easily damaged even when subjected to a drop impact.

第３刃部角度ａ２をすくい角度ｂと同じか、これより小さく設定すると、すくい面４４から基部すくい面４５に至る間の切刃３２の外形線を、さらに大きく抉られた形状にして、先の外形線と基準線Ｘにはさまれる空間をさらに大きくすることができる。従って、切刃３２の刃先４０で切断された直後の切断対象を、大きく抉られたすくい面４４および基部すくい面４５の側へ案内して刃先４０から速やかに遠ざけることができる。これにより、切断対象が刃先４０の近傍に溜まるのを解消して、さらに的確に切断対象の切断を行える。また、第２刃部４２に連続して第３刃部４３を設けるので、第２刃部４２の構造強度を第３刃部４３で増強して切刃３２の構造強度を向上できる。 When the third blade angle a2 is set to be equal to or smaller than the rake angle b, the outline of the cutting blade 32 between the rake face 44 and the base rake face 45 is made to be a larger shape, The space between the outer contour line and the reference line X can be further increased. Therefore, the cutting object immediately after being cut by the cutting edge 40 of the cutting edge 32 can be guided to the side of the rake face 44 and the base rake face 45 that are greatly scooped and can be quickly moved away from the cutting edge 40. As a result, it is possible to eliminate the accumulation of the cutting target in the vicinity of the blade edge 40 and to perform the cutting of the cutting target more accurately. Moreover, since the 3rd blade part 43 is provided continuously from the 2nd blade part 42, the structural strength of the 2nd blade part 42 can be strengthened by the 3rd blade part 43, and the structural strength of the cutting blade 32 can be improved.

すくい角度ｂを４５度以上に設定すると、刃先角度ａを４５度以下にして、第１刃部４１を薄いくさび形の先鋭形状に形成できるので、切断対象の切断をシャープにしかも的確に行って、切刃３２の切れ味を向上することができる。とくに、すくい角度ｂが４５度を越え大きく設定してある場合には、刃先４０による切断をシャープに行って、切刃３２の切れ味をさらに向上できる。 If the rake angle b is set to 45 degrees or more, the blade edge angle a can be set to 45 degrees or less, and the first blade portion 41 can be formed into a thin wedge-shaped sharpened shape, so that the cutting object can be cut sharply and accurately. The sharpness of the cutting blade 32 can be improved. In particular, when the rake angle b is set larger than 45 degrees, the cutting edge 32 can be sharply cut to further improve the sharpness of the cutting edge 32.

刃先角度ａと、第２刃部角度ａ１と、第３刃部角度ａ２の関係を、不等式（ａ１＜ａ＜ａ２）を満足するように設定するのは次の理由による。刃先角度ａが第２刃部角度ａ１より大きくしてあると、第１刃部４１の構造強度を高めることができるので、刃先４０のチッピングや欠損（刃こぼれ）を極力避けることができる。また、第３刃部角度ａ２を刃先角度ａより大きくするので、第３刃部４３で第２刃部４２の構造強度を高めて、落下衝撃を受けるような場合に切刃３２が破損するのを確実に防止できる。さらに、第３刃部角度ａ２を大きくする分だけ、短期間で第１刃部４１や第２刃部４２が損耗し、切れ味が急激に低下するのを解消して内刃１６の耐久性を向上できる。 The relationship between the blade edge angle a, the second blade portion angle a1, and the third blade portion angle a2 is set so as to satisfy the inequality (a1 <a <a2) for the following reason. If the blade edge angle a is larger than the second blade portion angle a1, the structural strength of the first blade portion 41 can be increased, so that chipping and chipping (blade spillage) of the blade edge 40 can be avoided as much as possible. Further, since the third blade portion angle a2 is made larger than the blade edge angle a, the third blade portion 43 increases the structural strength of the second blade portion 42, and the cutting blade 32 is damaged when receiving a drop impact. Can be reliably prevented. Furthermore, as the third blade portion angle a2 is increased, the first blade portion 41 and the second blade portion 42 are worn out in a short period of time and the sharpness is sharply reduced, thereby improving the durability of the inner blade 16. It can be improved.

刃先角度ａとすくい角度ｂの合計角度を９０度前後（８７〜９１度）に設定すると、刃先４０の角度を小さくしながら切刃３２の剛性を向上して、回転刃１６の耐久性を向上できる。因みに、合計角度が８７度未満であると、すくい角度ｂを一定とした場合に、第１刃部４１の刃厚みが小さくなるので、切刃３２の剛性が低下するのを避けられない。また、合計角度が９１度を越えると、すくい角度ｂを一定とした場合に、刃先４０の角度が大きくなるので切れ味が極端に低下する。 When the total angle of the cutting edge angle a and the rake angle b is set to around 90 degrees (87 to 91 degrees), the rigidity of the cutting edge 32 is improved while the angle of the cutting edge 40 is reduced, and the durability of the rotary blade 16 is improved. it can. Incidentally, if the total angle is less than 87 degrees, when the rake angle b is constant, the blade thickness of the first blade portion 41 becomes small, so it is inevitable that the rigidity of the cutting blade 32 is lowered. On the other hand, when the total angle exceeds 91 degrees, when the rake angle b is constant, the angle of the blade edge 40 is increased, and the sharpness is extremely lowered.

第２刃部４２の第２刃先面４８を逃げ角度ｃの分だけ、下り傾斜させると、第２刃先面４８が第１刃部４１の逃げ面として機能するので、切断対象を切断するときの切断抵抗を小さくして、回転刃１６を回転駆動するときの駆動手段の駆動負荷を軽減できる。 When the second blade edge surface 48 of the second blade portion 42 is inclined downward by the clearance angle c, the second blade edge surface 48 functions as the flank surface of the first blade portion 41. By reducing the cutting resistance, the driving load of the driving means when the rotary blade 16 is rotationally driven can be reduced.

逃げ角度ｃと、第２刃部角度ａ１と、すくい角度ｂの３者の関係を、不等式（ｃ＜ａ１＜＝ｂ）を満足するように設定するのは次の理由による。逃げ角度ｃを第２刃部角度ａ１より小さく設定すると、逃げ角度ｃが不必要に大きくなるのを避けて、第２刃部４２の刃厚みを充分に大きなものとすることができる。また、第２刃部角度ａ１をすくい角度ｂと同じか、これより小さく設定するので、第２刃部４２の刃厚みが必要以上に分厚くなるのを防止できる。従って、ひげ切断をシャープに行いながら、第２刃部４２が損耗して切れ味が急激に低下するのを解消して切刃３２の耐久性を向上できる。 The reason why the three-way relationship of the clearance angle c, the second blade angle a1, and the rake angle b is set so as to satisfy the inequality (c <a1 <= b) is as follows. If the clearance angle c is set to be smaller than the second blade portion angle a1, the blade thickness of the second blade portion 42 can be made sufficiently large by avoiding the clearance angle c from becoming unnecessarily large. Further, since the second blade angle a1 is set to be equal to or smaller than the rake angle b, it is possible to prevent the blade thickness of the second blade portion 42 from becoming unnecessarily thick. Accordingly, the sharpness of the cutting blade 32 can be improved by eliminating the sharp deterioration of the sharpness while the second blade portion 42 is worn while sharply cutting the beard.

刃先４０と第２刃先面４８の間に下り傾斜する刃先面４７を形成すると、くさび状の第１刃部４１の刃先４０のみで切断対象を切断できるので、切断時の切断抵抗を大幅に軽減して、回転刃１６を回転駆動するときの駆動手段の駆動負荷をさらに軽減できる。 When the cutting edge surface 47 that is inclined downward is formed between the cutting edge 40 and the second cutting edge surface 48, the cutting object can be cut only by the cutting edge 40 of the wedge-shaped first cutting edge portion 41, so that the cutting resistance during cutting is greatly reduced. Thus, it is possible to further reduce the driving load of the driving means when the rotary blade 16 is rotationally driven.

固定切断刃１７と協同して切断対象を切断する回転刃１６において、刃先４０の軸心方向の両端に刃先隅部５０が形成してあると、固定切断刃１７が切断対象部から押付け反力を受けて弾性変形するとき、固定切断刃１７が刃先４０の両端隅部に引っ掛かって破損するのを確実に防止して、固定切断刃１７の耐久性を向上できる。 In the rotary blade 16 that cuts the object to be cut in cooperation with the fixed cutting blade 17, if the blade edge corners 50 are formed at both ends in the axial direction of the blade edge 40, the fixed cutting blade 17 is pressed against the reaction force from the cutting object portion When receiving and elastically deforming, it is possible to reliably prevent the fixed cutting blade 17 from being caught by the both end corners of the cutting edge 40 and being damaged, and to improve the durability of the fixed cutting blade 17.

本発明に係る小型電気機器は、上記の回転刃１６と、回転刃１６を回転駆動する駆動手段を備えているので、切断対象を鋭い切れ味で軽快に切断でき、しかも、切刃３２の剛性を向上して長期にわたって鋭い切れ味を維持できる小型電気機器とすることができる。具体的には、小型電気機器は電気かみそりや、爪や角質等のケラチンを削る角質削り器として適用することができる。 Since the small electric device according to the present invention includes the rotary blade 16 and a driving unit that rotationally drives the rotary blade 16, the cutting target can be easily cut with a sharp sharpness, and the rigidity of the cutting blade 32 can be increased. It can improve and can be set as the small electric equipment which can maintain a sharp sharpness over a long term. Specifically, the small electric device can be applied as an electric shaver or a keratin shaving machine for shaving keratin such as nails and keratin.

本発明の実施例１に係る回転刃の詳細構造を示す縦断側面図である。It is a vertical side view which shows the detailed structure of the rotary blade which concerns on Example 1 of this invention. 実施例１に係る電気かみそりの正面図である。1 is a front view of an electric razor according to Embodiment 1. FIG. 実施例１に係る電気かみそりの側面図である。1 is a side view of an electric razor according to Embodiment 1. FIG. 実施例１に係るかみそりヘッドの一部を破断した分解正面図である。It is the disassembled front view which fractured | ruptured a part of razor head concerning Example 1. FIG. 実施例１に係るかみそりヘッドの一部を破断した正面図である。FIG. 3 is a front view in which a part of the razor head according to the first embodiment is broken. 実施例１に係るかみそりヘッドの縦断側面図である。It is a vertical side view of the razor head which concerns on Example 1. FIG. 実施例１に係る回転刃の斜視図である。1 is a perspective view of a rotary blade according to Embodiment 1. FIG. 本発明の実施例２に係る回転刃の詳細構造を示す縦断側面図である。It is a vertical side view which shows the detailed structure of the rotary blade which concerns on Example 2 of this invention. 本発明の実施例３に係る回転刃の詳細構造を示す縦断側面図である。It is a vertical side view which shows the detailed structure of the rotary blade which concerns on Example 3 of this invention. 本発明の実施例４に係る角質削り器を示す側面図である。It is a side view which shows the keratin sharpener which concerns on Example 4 of this invention.

（実施例１）図１ないし図７は、本発明に係る回転刃をロータリー式の電気かみそり（小型電気機器）の内刃に適用した実施例１を示す。本発明における前後、左右、上下とは、図２および図３に示す交差矢印と、矢印の近傍の前後・左右・上下の表記に従う。図２、図３において電気かみそりは、グリップを兼ねる本体ケース１と、本体ケース１で支持したかみそりヘッド２を備えている。本体ケース１の内部には、モーター３、２次電池４、および制御基板５などの電装品が配置してある。制御基板５には、モーター３への通電状態を切換えるスイッチ６や、電池残量を発光表示するＬＥＤなどが実装してある。本体ケース１の前面には、舟形のスイッチパネル７が配置されて、その上端寄りに先のスイッチ６を切換え操作するスイッチボタン８が配置してある。本体ケース１の後面側には、きわ剃り刃９と、きわ剃り刃９を駆動位置へ押し上げ操作するスライドノブ１０が設けてある。 (Example 1) FIG. 1 thru | or FIG. 7 shows Example 1 which applied the rotary blade which concerns on this invention to the inner blade of a rotary electric shaver (small electric equipment). In the present invention, “front / rear”, “left / right”, and “upper / lower” follow the crossing arrows shown in FIG. 2 and FIG. 2 and 3, the electric razor includes a main body case 1 that also serves as a grip, and a razor head 2 supported by the main body case 1. In the main body case 1, electrical components such as a motor 3, a secondary battery 4, and a control board 5 are arranged. The control board 5 is mounted with a switch 6 for switching the energization state of the motor 3 and an LED for displaying the remaining battery level. A boat-shaped switch panel 7 is disposed on the front surface of the main body case 1, and a switch button 8 for switching the previous switch 6 is disposed near the upper end thereof. On the rear surface side of the main body case 1, a shaving blade 9 and a slide knob 10 that pushes up the shaving blade 9 to a driving position are provided.

図４および図５において、かみそりヘッド２は、門形のヘッドベース１３と、ヘッドベース１３に対して着脱される内刃ホルダー１４、および外刃ホルダー１５と、内刃ホルダー１４に設けたロータリー式の内刃（回転刃）１６と、外刃ホルダー１５で支持される外刃（固定切断刃）１７などで構成してある。ヘッドベース１３は、本体ケース１に設けた回動軸１８で前後傾動可能に支持されて、図示していないばねで傾動待機位置（図３に示す状態）へ向かって復帰付勢してある。 4 and 5, the razor head 2 includes a portal-type head base 13, an inner blade holder 14 that is attached to and detached from the head base 13, an outer blade holder 15, and a rotary type provided in the inner blade holder 14. The inner blade (rotating blade) 16 and the outer blade (fixed cutting blade) 17 supported by the outer blade holder 15 are configured. The head base 13 is supported by a pivot shaft 18 provided in the main body case 1 so as to be tiltable back and forth, and is urged to return to a tilt standby position (state shown in FIG. 3) by a spring (not shown).

図５に示すように、内刃１６を回転駆動するために、本体ケース１およびヘッドベース１３の内部に、前段駆動部Ｔ１および次段駆動部Ｔ２からなる内刃駆動構造を配置している。前段駆動部Ｔ１は、モーター３の縦軸回りの回転動力を、減速しながら横軸回りの回転動力に変換するギヤトレインで構成してあり、次段駆動部Ｔ２は、先のギヤトレインの終段ギヤの回転動力を内刃１６に伝動する巻掛け伝動機構で構成してある。詳しく説明すると、巻掛け伝動機構は、終段ギヤ軸に固定される駆動プーリー２１と、後述する内刃軸（回転軸）３３に連結される従動プーリー２２と、これら両プーリー２１・２２に巻掛けたタイミングベルト２３などで構成してある。内刃軸３３は、内刃（回転刃）１６の回転中心軸である。従動プーリー２２は、内刃軸３３を連結するための継手を兼ねており、ヘッドベース１３に設けた軸受体で回転自在に支持してある。上記のモーター３および内刃駆動構造が、本発明で言う「回転刃を回転駆動する駆動手段」となる。 As shown in FIG. 5, in order to rotationally drive the inner blade 16, an inner blade drive structure including a front drive unit T <b> 1 and a next drive unit T <b> 2 is arranged inside the main body case 1 and the head base 13. The front-stage drive unit T1 includes a gear train that converts rotational power about the vertical axis of the motor 3 into rotational power about the horizontal axis while decelerating, and the next-stage drive unit T2 is the end of the previous gear train. The winding power transmission mechanism is configured to transmit the rotational power of the step gear to the inner blade 16. More specifically, the winding transmission mechanism includes a driving pulley 21 fixed to the final stage gear shaft, a driven pulley 22 connected to an inner blade shaft (rotating shaft) 33 described later, and windings around these pulleys 21 and 22. It is composed of a timing belt 23 and the like that are hung. The inner blade shaft 33 is a rotation center axis of the inner blade (rotating blade) 16. The driven pulley 22 also serves as a joint for connecting the inner blade shaft 33, and is rotatably supported by a bearing body provided on the head base 13. The motor 3 and the inner blade driving structure are the “driving means for rotationally driving the rotating blade” in the present invention.

図４に示すように、内刃１６は内刃ホルダー１４で片持ち支持されているが、内刃ホルダー１４をヘッドベース１３にスライド装着することにより、内刃軸３３が従動プーリー２２と連結されて、両持ち支持された状態で水平軸周りに回転駆動可能となる。図６、および図４に示すように、網刃からなる外刃１７は外刃ホルダー１５で逆Ｕ字状に保形された状態で支持してある。また、図４に示すように、外刃１７の前後縁に固定した外刃枠２４を圧縮ばね２５で押し下げ付勢することにより、外刃１７を内刃１６に常に密着できるようにしている。ヘッドベース１３には、外刃ホルダー１５をロック保持するロック爪２６とロックばね２７が組み付けてある。ロック爪２６は、外刃ホルダー１５の側壁内面に設けた係合凹部２８（図４参照）と係合する向きにロックばね２７で付勢してある。 As shown in FIG. 4, the inner blade 16 is cantilevered by the inner blade holder 14, but the inner blade shaft 33 is connected to the driven pulley 22 by slidingly mounting the inner blade holder 14 on the head base 13. Thus, it can be rotated around the horizontal axis while being supported at both ends. As shown in FIGS. 6 and 4, the outer blade 17 formed of a mesh blade is supported by the outer blade holder 15 in a state of being retained in an inverted U shape. Further, as shown in FIG. 4, the outer blade 17 is always brought into close contact with the inner blade 16 by pressing and urging the outer blade frame 24 fixed to the front and rear edges of the outer blade 17 with a compression spring 25. A lock claw 26 and a lock spring 27 that lock and hold the outer blade holder 15 are assembled to the head base 13. The lock claw 26 is urged by a lock spring 27 so as to be engaged with an engagement recess 28 (see FIG. 4) provided on the inner surface of the side wall of the outer blade holder 15.

上記のように構成した電気かみそりにおいて、口、頬、顎の周りのひげ（切断対象）を鋭い切れ味で軽快に切断できるようにするために、内刃１６を以下のように構成した。図１、図６において、内刃１６は軸部３１と、軸部３１の周囲に設けた８個の切刃３２と、軸部３１の中心に固定した内刃軸３３などで構成する。軸部３１は、切刃３２を備えた外軸部３４と、外軸部３４の内部に圧入固定される内軸部３５とで構成してある。内外の両軸部３４・３５のうち、外軸部３４は超硬合金製の円筒体に切削加工を施して形成してあり、内軸部３５は鋼棒に切削加工を施して形成してある。この実施例においては、外軸部３４の形成素材として、炭化タングステンの粉末にコバルト粉末を混合したのち、焼結処理して得られる超硬合金製の円筒体を使用した。また、軸部３１の外軸部３４のみを高価な超硬合金で構成することにより、内刃１６のコストが嵩むのを抑止できるようにした。 In the electric razor configured as described above, the inner blade 16 is configured as follows in order to be able to cut the beard (cutting target) around the mouth, cheeks, and jaws with a sharp sharpness. 1 and 6, the inner blade 16 includes a shaft portion 31, eight cutting blades 32 provided around the shaft portion 31, an inner blade shaft 33 fixed to the center of the shaft portion 31, and the like. The shaft portion 31 includes an outer shaft portion 34 having a cutting edge 32 and an inner shaft portion 35 that is press-fitted and fixed inside the outer shaft portion 34. Of both the inner and outer shaft portions 34 and 35, the outer shaft portion 34 is formed by cutting a cemented carbide cylindrical body, and the inner shaft portion 35 is formed by cutting a steel rod. is there. In this embodiment, as a material for forming the outer shaft portion 34, a cemented carbide cylindrical body obtained by mixing cobalt powder with tungsten carbide powder and then sintering the powder was used. Further, only the outer shaft portion 34 of the shaft portion 31 is made of an expensive cemented carbide, so that the cost of the inner blade 16 can be suppressed.

図１に示すように、切刃３２は刃先４０を含む第１刃部４１と、第１刃部４１に連続する第２刃部４２と、第２刃部４２に連続する第３刃部４３を備えており、切刃３２の回転上手側にすくい面４４と、基部すくい面４５と、刃溝４６が形成してある。第１刃部４１は、直線状のすくい面４４と、刃先４０に連続する直線状の刃先面４７でくさび状に形成してある。また、第２刃部４２は、直線状のすくい面４４と、刃先面４７に連続して傾斜する直線状の第２刃先面４８でくさび状に形成してある。さらに、第３刃部４３は、すくい面４４に連続して屈折する基部すくい面４５と、第２刃先面４８に連続して傾斜する第３刃先面４９で先すぼまり状に形成してある。第２刃部４２の第２刃先面４８と、第３刃部４３の第３刃先面４９は、切刃３２と外刃１７の接触面積を小さくするために設けてあって、切刃３２の逃げ面として機能している。 As shown in FIG. 1, the cutting blade 32 includes a first blade portion 41 including a cutting edge 40, a second blade portion 42 continuous with the first blade portion 41, and a third blade portion 43 continuous with the second blade portion 42. A rake face 44, a base rake face 45, and a blade groove 46 are formed on the upper rotation side of the cutting edge 32. The first blade portion 41 is formed in a wedge shape with a linear rake face 44 and a linear blade edge surface 47 continuous with the blade edge 40. Further, the second blade portion 42 is formed in a wedge shape by a linear rake face 44 and a linear second cutting edge face 48 that is continuously inclined to the cutting edge face 47. Further, the third blade portion 43 is formed in a tapered shape with a base rake surface 45 that is continuously refracted on the rake surface 44 and a third blade edge surface 49 that is continuously inclined on the second blade edge surface 48. is there. The second blade edge surface 48 of the second blade portion 42 and the third blade edge surface 49 of the third blade portion 43 are provided in order to reduce the contact area between the cutting blade 32 and the outer blade 17. It functions as a flank.

隣接する一対の切刃３２は、第３刃先面４９と刃溝４６と基部すくい面４５を記載順に介して周方向へ連続している。図７に示すように、刃先４０および切刃３２は、引き切り作用を発揮できるようにするために、軸部３１の軸心方向に沿って螺旋状に捻じられた状態で形成してある。また、切刃３２の構造強度を向上するために、第３刃部４３の第３刃先面４９の長さは、他の刃先面４７・４８より充分に大きく設定されてなだらかに傾斜させてあり、第３刃部４３の刃厚みと体積を大きくすることで、第１刃部４１および第２刃部４２の構造強度を向上している。図７に示すように刃先４０の軸心方向の両端隅部には、外刃１７との接触を避ける刃先隅部５０が形成してある。この実施例では、刃先４０の軸心方向の両端隅部を丸め、さらに面取りして刃先隅部５０とした。このように、刃先４０の両端隅部に刃先隅部５０を設けておくと、外刃１７が肌面から押付け反力を受けて内凹み状に弾性変形するとき、外刃１７の切刃５３が刃先４０の両端隅部に引っ掛かって破損するのを確実に防止できる。 The pair of adjacent cutting blades 32 are continuous in the circumferential direction through the third cutting edge surface 49, the blade groove 46, and the base rake face 45 in the order of description. As shown in FIG. 7, the cutting edge 40 and the cutting edge 32 are formed in a state of being spirally twisted along the axial direction of the shaft portion 31 so that the cutting action can be exhibited. Further, in order to improve the structural strength of the cutting edge 32, the length of the third cutting edge surface 49 of the third cutting edge portion 43 is set to be sufficiently larger than the other cutting edge surfaces 47 and 48 and is gently inclined. The structural strength of the first blade portion 41 and the second blade portion 42 is improved by increasing the blade thickness and volume of the third blade portion 43. As shown in FIG. 7, a blade edge corner 50 that avoids contact with the outer blade 17 is formed at both corners in the axial direction of the blade edge 40. In this embodiment, both corners of the cutting edge 40 in the axial direction are rounded and further chamfered to form the cutting edge corner 50. In this way, when the blade edge corners 50 are provided at both end corners of the blade edge 40, when the outer blade 17 receives a pressing reaction force from the skin surface and elastically deforms into an inner dent shape, the cutting blade 53 of the outer blade 17 is provided. Can be reliably prevented from being caught by the both end corners of the blade edge 40 and being damaged.

図６に示すように、外刃１７は電鋳法で網刃状に形成してあり、その網面にはシェル状の切刃５３および刃穴５５の一群が交互に形成してある。内刃１６の刃先４０と協同してひげをシャープに切断するために、切刃５３の刃先エッジ５４は鋭角に形成してある。 As shown in FIG. 6, the outer blade 17 is formed in a mesh blade shape by electroforming, and a group of shell-shaped cutting blades 53 and blade holes 55 are alternately formed on the mesh surface. In order to cut the beard sharply in cooperation with the cutting edge 40 of the inner blade 16, the cutting edge 54 of the cutting blade 53 is formed at an acute angle.

ひげを鋭い切れ味で軽快に切断し、しかも、切刃３２の剛性を向上して長期にわたって鋭い切れ味を維持するために、切刃３２の各部の角度関係を以下のように設定した。
（すくい角度と刃先角度の関係）
図１において、軸部３１の回転中心と刃先４０を通る基準線Ｘと、刃先４０を通る刃先接線Ｙと、刃先４０および第１刃部４１のすくい面４４を通るすくい角線Ｐを想定するとき、基準線Ｘとすくい角線Ｐで挟むすくい角度ｂを、刃先面４７とすくい角線Ｐで挟む刃先角度ａより大きく設定し、不等式（ａ＜＝ｂ）を満足できるようにした。この実施例では、すくい角度ｂを５２度とし、刃先角度ａを３８度とした。また、刃先角度ａとすくい角度ｂの合計角度が９０度になるようにした。この実施例においては、刃先面４７が刃先接線Ｙ上に位置している。
すくい角度ｂを刃先角度ａより大きく設定すると、刃先４０の角度を小さくできるので、刃先角度ａがすくい角度ｂより大きく設定してある場合に比べて、切刃３２の切れ味をシャープで鋭いものとすることができ、従って、軽快なひげ剃り感を発揮できる。また、第１刃部４１と、第１刃部４１に連続する第２刃部４２で切刃３２を構成して、刃先４０を含む第１刃部４１の構造強度を第２刃部４２で増強するので、単に切刃の刃先厚みを薄くした一体型の回転刃に比べて、切刃３２の剛性を向上できる。従って、長期にわたって鋭い切れ味を維持しながら、落下衝撃を受けても破損しにくい耐久性に優れた内刃１６とすることができる。
刃先角度ａとすくい角度ｂの合計角度を９０度に設定すると、刃先４０の角度を小さくして、切れ味を鋭いものとしながら切刃３２の剛性を向上して、内刃１６の耐久性を向上できる。刃先角度ａとすくい角度ｂの合計角度は９０度前後（８７〜９１度）であればよいが、合計角度が８７度未満であると、すくい角度ｂを一定とした場合に、第１刃部４１の刃厚みが小さくなるので、切刃３２の剛性が低下するのを避けられない。また、合計角度が９１度を越えると、すくい角度ｂを一定とした場合に、刃先４０の角度が大きくなり、さらに刃先４０が外刃１７に接触しなくなるので切れ味が極端に低下する。 In order to lightly cut the beard with a sharp edge and to improve the rigidity of the cutting edge 32 and maintain the sharpness over a long period of time, the angular relationship of each part of the cutting edge 32 was set as follows.
(Relationship between rake angle and cutting edge angle)
In FIG. 1, a reference line X passing through the rotation center of the shaft portion 31 and the cutting edge 40, a cutting edge tangent line Y passing through the cutting edge 40, and a rake angle P passing through the cutting edge 44 of the cutting edge 40 and the first cutting edge 41 are assumed. At this time, the rake angle b sandwiched between the reference line X and the rake angle line P is set larger than the blade edge angle a sandwiched between the edge surface 47 and the rake angle line P, so that the inequality (a <= b) can be satisfied. In this example, the rake angle b was 52 degrees and the blade edge angle a was 38 degrees. The total angle of the blade edge angle a and the rake angle b was set to 90 degrees. In this embodiment, the cutting edge surface 47 is located on the cutting edge tangent Y.
If the rake angle b is set larger than the cutting edge angle a, the angle of the cutting edge 40 can be reduced, so that the sharpness of the cutting edge 32 is sharper and sharper than when the cutting edge angle a is set larger than the rake angle b. Therefore, a light shaving feeling can be exhibited. Moreover, the cutting blade 32 is comprised by the 1st blade part 41 and the 2nd blade part 42 which continues to the 1st blade part 41, and the structural strength of the 1st blade part 41 containing the blade edge 40 is made into the 2nd blade part 42. Therefore, the rigidity of the cutting blade 32 can be improved as compared with an integrated rotary blade in which the cutting edge thickness of the cutting blade is simply reduced. Therefore, it is possible to make the inner blade 16 excellent in durability, which is not easily damaged even when subjected to a drop impact, while maintaining a sharp sharpness over a long period of time.
When the total angle of the blade edge angle a and the rake angle b is set to 90 degrees, the angle of the blade edge 40 is decreased, the rigidity of the cutting blade 32 is improved while sharpness is sharpened, and the durability of the inner blade 16 is improved. it can. The total angle of the cutting edge angle a and the rake angle b may be about 90 degrees (87 to 91 degrees), but if the total angle is less than 87 degrees, the rake angle b is constant, the first blade portion Since the blade thickness of 41 becomes small, the rigidity of the cutting blade 32 cannot be avoided. On the other hand, when the total angle exceeds 91 degrees, the angle of the blade edge 40 increases when the rake angle b is constant, and the cutting edge 40 is not brought into contact with the outer blade 17, so that the sharpness is extremely lowered.

（すくい角度と第２刃部角度の関係）
すくい角線Ｐと第２刃部４２の第２刃先面４８で挟む第２刃部角度ａ１を、すくい角度ｂと同じか、これより小さく設定し、不等式（ａ１＜＝ｂ）を満足できるようにした。この実施例では、第２刃部角度ａ１を２７度として、すくい角度ｂ（５２度）の半分強とした。
第２刃部角度ａ１を、すくい角度ｂと同じか、これより小さく設定すると、刃先４０から刃溝４６に至る間の切刃３２の外形線を大きく抉られた形状にして、先の外形線と基準線Ｘにはさまれる空間を大きくすることができる。また、切刃３２の刃先４０と外刃１７の刃先エッジ５４で切断された直後のひげ屑を、大きく抉られたすくい面４４の側へ案内して刃先４０から速やかに遠ざけることができる。従って、ひげ屑が刃先４０の近傍に溜まって、外刃１７の刃穴５５から入込んだ切断前のひげと接触するのを解消して的確にひげ切断を行える。 (Relationship between rake angle and second blade angle)
The second blade angle a1 sandwiched between the rake angle P and the second blade edge surface 48 of the second blade portion 42 is set to be equal to or smaller than the rake angle b so that the inequality (a1 <= b) can be satisfied. I made it. In this embodiment, the second blade angle a1 is set to 27 degrees, which is slightly more than half the rake angle b (52 degrees).
When the second blade angle a1 is set to be equal to or smaller than the rake angle b, the outer contour line of the cutting blade 32 from the blade tip 40 to the blade groove 46 is greatly sharpened, and the previous outer contour line And the space between the reference line X can be increased. In addition, the shavings immediately after being cut at the cutting edge 40 of the cutting edge 32 and the cutting edge 54 of the outer edge 17 can be guided to the side of the rake face 44 that is greatly scooped away and quickly moved away from the cutting edge 40. Therefore, whisker scraps are collected in the vicinity of the cutting edge 40 and contact with the uncut cutting whisker that has entered from the blade hole 55 of the outer blade 17 is eliminated, so that whisker cutting can be performed accurately.

（すくい角度と第３刃部角度の関係）
第３刃先面４９と基部すくい面４５に挟まれる第３刃部角度ａ２を、すくい角度ｂと同じか、これより小さく設定し、不等式（ａ２＜＝ｂ）を満足できるようにした。この実施例では、第３刃部角度ａ２を４０度として、すくい角度ｂ（５２度）の７割強とした。
第３刃部角度ａ２をすくい角度ｂと同じか、これより小さく設定すると、すくい面４４から基部すくい面４５に至る間の切刃３２の外形線を大きく抉られた形状にして、先の外形線と基準線Ｘにはさまれる空間をさらに大きくすることができる。従って、切刃３２の刃先４０と外刃１７の刃先エッジ５４で切断された直後のひげ屑を、大きく抉られたすくい面４４および基部すくい面４５の側へ案内して刃先４０から速やかに遠ざけることができる。これに伴い、ひげ屑が刃先４０の近傍に溜まって、外刃１７の刃穴５５から入込んだ切断前のひげと接触するのを解消して的確にひげ切断を行える。 (Relationship between rake angle and third blade angle)
The third blade angle a2 between the third blade edge surface 49 and the base rake face 45 is set to be equal to or smaller than the rake angle b so that the inequality (a2 <= b) can be satisfied. In this embodiment, the third blade angle a2 is set to 40 degrees, and the rake angle b (52 degrees) is set to a little over 70%.
If the third blade angle a2 is set to be equal to or smaller than the rake angle b, the outline of the cutting edge 32 between the rake face 44 and the base rake face 45 is made to be a large shape, The space between the line and the reference line X can be further increased. Therefore, the shavings immediately after being cut by the cutting edge 40 of the cutting blade 32 and the cutting edge 54 of the outer blade 17 are guided to the side of the scooping face 44 and the base scooping face 45 that are greatly scooped away and are quickly moved away from the cutting edge 40. be able to. Along with this, whiskers are collected in the vicinity of the cutting edge 40 and contact with the uncut whisker that has entered from the blade hole 55 of the outer blade 17 is eliminated, so that whiskers can be cut accurately.

（すくい角度）
すくい角度ｂは４５度、もしくは４５度以上に設定して、不等式（４５度＜＝ｂ）を満足できるようにした。先に説明したように、この実施例ではすくい角度ｂを５２度として、すくい角度ｂが刃先角度ａ（３８度）より充分に大きくなるようにした。
すくい角度ｂを４５度以上に設定すると、刃先角度ａを４５度以下にして、第１刃部４１を薄いくさび形の先鋭形状に形成できるので、ひげ切断をシャープにしかも的確に行って、切刃３２の切れ味を向上することができる。 (Rake angle)
The rake angle b was set to 45 degrees or more than 45 degrees to satisfy the inequality (45 degrees <= b). As described above, in this embodiment, the rake angle b is 52 degrees, and the rake angle b is sufficiently larger than the blade edge angle a (38 degrees).
When the rake angle b is set to 45 degrees or more, the blade edge angle a can be set to 45 degrees or less, and the first blade portion 41 can be formed into a thin wedge-shaped sharpened shape. The sharpness of the blade 32 can be improved.

（刃先角度と第２刃部角度と第３刃部角度の関係）
刃先角度ａと、第２刃部角度ａ１と、第３刃部角度ａ２は、不等式（ａ１＜ａ＜ａ２）を満足するように設定した。具体的には、先に説明したように、第２刃部角度ａ１を２７度とし、刃先角度ａを３８度とし、第３刃部角度ａ２を４０度とした。
刃先角度ａが第２刃部角度ａ１より大きくしてあると、第１刃部４１の構造強度を高めることができるので、刃先４０のチッピングや欠損（刃こぼれ）を極力避けることができる。また、第３刃部角度ａ２が刃先角度ａより大きいので、第３刃部４３で第２刃部４２の構造強度を高めて、落下衝撃を受けるような場合に切刃３２が破損するのを確実に防止できる。さらに、短期間で第１刃部４１や第２刃部４２が損耗し、切れ味が急激に低下するのを解消して内刃１６の耐久性を向上できる。 (Relationship between blade edge angle, second blade angle, and third blade angle)
The blade edge angle a, the second blade portion angle a1, and the third blade portion angle a2 were set so as to satisfy the inequality (a1 <a <a2). Specifically, as described above, the second blade angle a1 was 27 degrees, the blade angle a was 38 degrees, and the third blade angle a2 was 40 degrees.
If the blade edge angle a is larger than the second blade portion angle a1, the structural strength of the first blade portion 41 can be increased, so that chipping and chipping (blade spillage) of the blade edge 40 can be avoided as much as possible. In addition, since the third blade portion angle a2 is larger than the blade edge angle a, the structural strength of the second blade portion 42 is increased by the third blade portion 43, and the cutting blade 32 is damaged when receiving a drop impact. It can be surely prevented. Furthermore, the durability of the inner blade 16 can be improved by eliminating the wear of the first blade portion 41 and the second blade portion 42 in a short period of time and the sharpness being lowered sharply.

（第２刃先面）
刃先接線Ｙと第２刃部４２の第２刃先面４８の間に逃げ角度ｃを設けて、第２刃部４２の第２刃先面４８を、刃先接線Ｙから軸部３１に近接する向きに下り傾斜させるようにした。この実施例では、逃げ角度ｃを１１度として、内刃１６が回転駆動されるとき第２刃先面４８が外刃１７と接触するのを防止した。
第２刃先面４８を刃先接線Ｙから軸部３１に近接する向きに下り傾斜させると、第２刃先面４８が第１刃部４１の逃げ面として機能するので、刃先４０を含む刃先面４７のみが外刃１７と摺動してひげ切断を行うことができる。従って、切刃３２と外刃１７の接触面積を小さくして、ひげ切断時の摺動抵抗と切断抵抗を小さくでき、その分だけモーター３の消費電力を削減し軽減できる。 (2nd cutting edge)
A clearance angle c is provided between the cutting edge tangent Y and the second cutting edge surface 48 of the second cutting edge portion 42, and the second cutting edge surface 48 of the second cutting edge portion 42 is oriented in the direction close to the shaft portion 31 from the cutting edge tangent Y. It was made to incline down. In this embodiment, the clearance angle c is set to 11 degrees to prevent the second blade edge surface 48 from coming into contact with the outer blade 17 when the inner blade 16 is rotationally driven.
When the second cutting edge surface 48 is inclined downward from the cutting edge tangent Y in a direction approaching the shaft portion 31, the second cutting edge surface 48 functions as a flank surface of the first cutting edge portion 41, and therefore only the cutting edge surface 47 including the cutting edge 40. Can slide with the outer blade 17 to cut the whiskers. Accordingly, the contact area between the cutting blade 32 and the outer blade 17 can be reduced to reduce the sliding resistance and cutting resistance when cutting the whiskers, and the power consumption of the motor 3 can be reduced and reduced accordingly.

（逃げ角度と第２刃部角度とすくい角度の関係）
第２刃先面４８と刃先接線Ｙに挟まれる逃げ角度をｃとするとき、逃げ角度ｃと、第２刃部角度ａ１と、すくい角度ｂの３者が、不等式（ｃ＜ａ１＜＝ｂ）を満足するように設定した。この実施例では、逃げ角度ｃを１１度とし、第２刃部角度ａ１を２７度とし、すくい角度ｂを５２度とした。
逃げ角度ｃを第２刃部角度ａ１より小さく設定し、第２刃部角度ａ１をすくい角度ｂより小さく設定すると、逃げ角度ｃが不必要に大きくなるのを避けて、第２刃部４２の刃厚みを充分に大きなものとしながら、第２刃部４２の刃厚みが必要以上に分厚くなるのを防止できる。従って、ひげ切断をシャープに行いながら、第２刃部４２が損耗して切れ味が急激に低下するのを解消して切刃３２の耐久性を向上できる。 (Relationship between clearance angle, second blade angle and rake angle)
When the clearance angle between the second cutting edge surface 48 and the cutting edge tangent line Y is c, the three of the clearance angle c, the second cutting edge angle a1, and the rake angle b are inequality (c <a1 <= b). Was set to satisfy. In this example, the clearance angle c was 11 degrees, the second blade angle a1 was 27 degrees, and the rake angle b was 52 degrees.
When the clearance angle c is set smaller than the second blade angle a1 and the second blade angle a1 is set smaller than the rake angle b, the escape angle c is prevented from becoming unnecessarily large. While making the blade thickness sufficiently large, it is possible to prevent the blade thickness of the second blade portion 42 from becoming excessively thick. Accordingly, the sharpness of the cutting blade 32 can be improved by eliminating the sharp deterioration of the sharpness while the second blade portion 42 is worn while sharply cutting the beard.

（その他の構成）
刃先接線Ｙと第３刃先面４９に挟まれる逃げ角度ｃ１は４３度とした。第１刃部４１の刃先面４７は刃先接線Ｙ上に位置しており、その幅寸法は０．１ｍｍである。なお、第１刃部４１と第２刃部４２と第３刃部４３の基本形状は、超硬合金製の円筒体に切削加工を施して形成するが、刃先面４７および第２刃先面４８は、切刃３２に研削加工を施して形成するので、各部の角度関係を正確に設定できる。 (Other configurations)
The clearance angle c1 between the blade edge tangent Y and the third blade edge surface 49 was 43 degrees. The blade edge surface 47 of the first blade portion 41 is located on the blade edge tangent Y, and the width dimension thereof is 0.1 mm. The basic shapes of the first blade portion 41, the second blade portion 42, and the third blade portion 43 are formed by cutting a cemented carbide cylindrical body. However, the blade edge surface 47 and the second blade edge surface 48 are formed. Since the cutting edge 32 is formed by grinding, the angular relationship between the respective parts can be set accurately.

（実施例２）図８は本発明に係る回転刃を、ロータリー式の電気かみそりの内刃に適用した実施例２を示す。そこでは、実施例１と同様に、図示していない軸部の周囲に８個の切刃３２を設けて内刃１６を構成するが、第１刃部４１の刃先面４７と第２刃部４２の第２刃先面４８の間に刃先逃げ面５６を設けて、第１刃部４１と外刃１７の接触面積を、実施例１の内刃１６に比べてさらに小さくできるようにした。詳しくは、刃先面４７の長さが０．０４ｍｍと小さいので、内刃１６の外刃１７に対する摺動抵抗を実施例１の内刃１６に比べて軽減して、実施例１の切刃３２に比べて、モーター３の消費電力をさらに削減し、切断抵抗を軽減できる。刃先接線Ｙと刃先逃げ面５６で挟む刃先逃げ角度ｄは５度とした。他は実施例１の内刃１６と同じであるので、同じ部材に同じ符号を付して、その説明を省略する。以下の実施例においても同じとする。 (Example 2) FIG. 8: shows Example 2 which applied the rotary blade which concerns on this invention to the inner blade of a rotary-type electric shaver. There, as in the first embodiment, eight cutting blades 32 are provided around a shaft portion (not shown) to form the inner blade 16, but the cutting edge surface 47 of the first blade portion 41 and the second blade portion. A cutting edge flank 56 is provided between the second cutting edge surfaces 48 of 42 so that the contact area between the first cutting edge portion 41 and the outer cutting edge 17 can be made smaller than that of the inner cutting edge 16 of the first embodiment. Specifically, since the length of the blade edge surface 47 is as small as 0.04 mm, the sliding resistance of the inner blade 16 against the outer blade 17 is reduced compared to the inner blade 16 of the first embodiment, and the cutting blade 32 of the first embodiment. Compared with, the power consumption of the motor 3 can be further reduced, and the cutting resistance can be reduced. The cutting edge clearance angle d sandwiched between the cutting edge tangent Y and the cutting edge flank 56 was 5 degrees. Since others are the same as the inner blade 16 of Example 1, the same code | symbol is attached | subjected to the same member and the description is abbreviate | omitted. The same applies to the following embodiments.

（実施例３）図９は本発明に係る回転刃を、ロータリー式の電気かみそりの内刃に適用した実施例３を示す。そこでは、実施例１と同様に、図示していない軸部の周囲に８個の切刃３２を設けて内刃１６を構成するが、第１刃部４１の刃先４０と第２刃部４２の第２刃先面４８の間に、刃先接線Ｙから軸部３１に近接する向きに下り傾斜する刃先面４７を形成して、刃先４０のみが外刃１７に接触するようにした。この実施例における第２刃部４２は、実施例１における第３刃部４３に相当しており、第２刃先面４８は実施例１における第３刃先面４９と同様に、隣接する切刃３２の刃溝４６に連続している。この実施例においては、刃先面４７が刃先接線Ｙ上に位置しておらず、第１刃部４１の刃先角度ａと第１刃部角度ａ３は同じであり、すくい角度ｂより小さく、２７度とした。
実施例３の切刃３２によれば、くさび状の第１刃部４１の刃先４０のみが外刃と接触してひげを切断するので、実施例１および実施例２の切刃３２に比べて、ひげ切断時の摺動抵抗と切断抵抗を大幅に軽減して、モーター３の消費電力をさらに削減できる。 (Example 3) FIG. 9 shows Example 3 in which the rotary blade according to the present invention is applied to an inner blade of a rotary electric razor. In this case, as in the first embodiment, eight cutting blades 32 are provided around a shaft portion (not shown) to constitute the inner blade 16, but the cutting edge 40 and the second blade portion 42 of the first blade portion 41. Between the second cutting edge surfaces 48, a cutting edge surface 47 that is inclined downward from the cutting edge tangent Y in a direction approaching the shaft portion 31 is formed so that only the cutting edge 40 contacts the outer blade 17. The second blade portion 42 in this embodiment corresponds to the third blade portion 43 in the first embodiment, and the second blade edge surface 48 is adjacent to the adjacent cutting blade 32 in the same manner as the third blade edge surface 49 in the first embodiment. The blade groove 46 is continuous. In this embodiment, the cutting edge surface 47 is not positioned on the cutting edge tangent Y, the cutting edge angle a of the first cutting edge 41 and the first cutting edge angle a3 are the same, smaller than the rake angle b, and 27 degrees. It was.
According to the cutting blade 32 of the third embodiment, only the cutting edge 40 of the wedge-shaped first blade portion 41 comes into contact with the outer blade to cut the whiskers, so that the cutting blade 32 of the first and second embodiments is compared with the cutting blade 32 of the first and second embodiments. The sliding resistance and cutting resistance at the time of cutting the whiskers can be greatly reduced, and the power consumption of the motor 3 can be further reduced.

（実施例４）図１０は本発明に係る回転刃を、爪やかかとの角質などのケラチンを削る角質削り器（小型電気機器）の回転刃に適用した実施例４を示す。そこでは、グリップを兼ねる本体ケース６１と、本体ケース６１で支持される減削ヘッド６２を備えている。本体ケース６１の内部には、モーター６３、２次電池６４などの電装品と、遊星歯車型の減速機６５が配置してあり、本体ケース６１の側面には、モーター６３への給電状態を切換えるスライドノブ６６が配置してある。スライドノブ６６はオフ位置と、低速位置と、高速位置の３段階に切換えることができる。 (Example 4) FIG. 10 shows Example 4 in which the rotary blade according to the present invention is applied to a rotary blade of a keratin scraper (small electric device) that cuts keratin such as keratin of a nail or a heel. There, a main body case 61 also serving as a grip and a reduction head 62 supported by the main body case 61 are provided. Inside the main body case 61, electrical components such as a motor 63 and a secondary battery 64 and a planetary gear type speed reducer 65 are arranged. The power supply state to the motor 63 is switched on the side surface of the main body case 61. A slide knob 66 is disposed. The slide knob 66 can be switched between three stages: an off position, a low speed position, and a high speed position.

丸筒状の減削ヘッド６２の前半周面には切削窓６８が開口してあり、その内部に回転駆動される減削刃（回転刃）６７が設けてある。減削刃６７は減速機６５の出力軸に連結してあり、減速機６５で減速された後のモーター６３の動力を受けて、垂直軸回りに回転駆動される。減削刃６７は、実施例１で説明した内刃１６と基本的に同じ構造であるが、軸心方向の長さが短い点が実施例１の内刃１６と異なる。上記のモーター６３および遊星歯車型の減速機６５が、本発明で言う「回転刃を回転駆動する駆動手段」となる。上記のように構成した角質削り器は、スライドノブ６６をオン操作してモーター６３を低速駆動状態または高速駆動状態にした状態で、減削刃６７の切刃３２を角質部分に押付けて、爪やかかとの角質などを除去することができる。 A cutting window 68 is opened on the front half peripheral surface of the round cylindrical reduction head 62, and a reduction cutting blade (rotating blade) 67 that is rotationally driven is provided therein. The reduction cutting blade 67 is connected to the output shaft of the speed reducer 65, and receives the power of the motor 63 after being decelerated by the speed reducer 65, and is rotationally driven around the vertical axis. The reduction blade 67 has basically the same structure as the inner blade 16 described in the first embodiment, but is different from the inner blade 16 in the first embodiment in that the length in the axial direction is short. The motor 63 and the planetary gear type speed reducer 65 are the “driving means for rotationally driving the rotary blade” in the present invention. The keratin sharpener configured as described above is configured such that the cutting blade 32 of the reduction blade 67 is pressed against the horny portion in a state where the slide knob 66 is turned on and the motor 63 is in a low speed driving state or a high speed driving state. The horny skin of the heel can be removed.

上記の実施例では、内刃１６の軸部３１を外軸部３４と内軸部３５で構成したがその必要はなく、軸部３１は１個の部材として構成することができる。その場合の軸部３１は、超硬合金で形成することが好ましい。また、軸部３１、切刃３２、内刃軸３３の３者は、超硬合金で一体に形成してあってもよい。このように、内刃１６の全体を超合金で一体に形成すると、内刃軸３３の強度が格段に向上する。従って、内刃軸３３の変形や破損を極力避けることができる。さらに、内刃軸３３の耐摩耗性を向上できるので、信頼性の高い回転刃を形成できる。切刃３２および刃先４０は螺旋状に形成する必要はなく、軸部３１の中心軸と平行に形成してあってもよい。すくい面４４と第２刃先面４８および第３刃先面４９は、平坦面で形成する必要はなく、緩やかに湾曲する湾曲面で形成してあってもよい。同様に、基部すくい面４５と刃先面４７は、緩やかに湾曲する湾曲面で形成してあってもよい。 In the above-described embodiment, the shaft portion 31 of the inner blade 16 is constituted by the outer shaft portion 34 and the inner shaft portion 35, but this is not necessary, and the shaft portion 31 can be constituted as one member. In that case, the shaft portion 31 is preferably formed of a cemented carbide. Further, the three members of the shaft portion 31, the cutting blade 32, and the inner blade shaft 33 may be integrally formed of a cemented carbide. As described above, when the entire inner blade 16 is integrally formed of a superalloy, the strength of the inner blade shaft 33 is remarkably improved. Therefore, deformation and breakage of the inner blade shaft 33 can be avoided as much as possible. Furthermore, since the wear resistance of the inner blade shaft 33 can be improved, a highly reliable rotary blade can be formed. The cutting blade 32 and the cutting edge 40 do not need to be formed in a spiral shape, and may be formed in parallel with the central axis of the shaft portion 31. The rake face 44, the second cutting edge surface 48, and the third cutting edge surface 49 need not be formed as flat surfaces, and may be formed as curved surfaces that are gently curved. Similarly, the base rake face 45 and the cutting edge face 47 may be formed by gently curved curved surfaces.

回転刃１６の切刃３２の数は必要に応じて自由に設定できる。すくい面４４、第２刃先面４８、第３刃先面４９は平坦面で形成する必要はなく、緩やかに湾曲する湾曲面で形成してあってもよい。回転刃１６は、超硬合金を素材にして形成するのが好ましいが、工具鋼を素材にして形成してあってもよい。 The number of cutting blades 32 of the rotary blade 16 can be freely set as necessary. The rake face 44, the second cutting edge face 48, and the third cutting edge face 49 need not be formed as flat surfaces, and may be formed as curved surfaces that are gently curved. The rotary blade 16 is preferably formed from cemented carbide, but may be formed from tool steel.

１本体ケース
２かみそりヘッド
３モーター
１６内刃（回転刃）
１７外刃（固定切断刃）
３１軸部
３２切刃
４０刃先
４１第１刃部
４２第２刃部
４３第３刃部
４４すくい面
４７刃先面
４８第２刃先面
４９第３刃先面
ａ刃先角度
ａ１第２刃先角度
ａ２第３刃先角度
ｂすくい角度 1 Body Case 2 Razor Head 3 Motor 16 Inner Blade (Rotating Blade)
17 Outer blade (fixed cutting blade)
31 Shaft part 32 Cutting edge 40 Cutting edge 41 First cutting edge part 42 Second cutting edge part 43 Third cutting edge part 44 Rake face 47 Cutting edge face 48 Second cutting edge face 49 Third cutting edge face a Cutting edge angle a1 Second cutting edge angle a2 Third Cutting edge angle b Rake angle

Claims

A rotary blade (16) comprising a shaft portion (31) and a plurality of cutting blades (32),
A reference line (X) passing through the rotation center of the shaft (31) and the cutting edge (40) of the cutting edge (32), a cutting edge tangent (Y) passing through the cutting edge (40), the cutting edge (40) and the first cutting edge Assuming a rake line (P) passing through the rake face (44) of (41),
The rake angle (b) sandwiched between the reference line (X) and the rake angle line (P) is set larger than the blade edge angle (a) sandwiched between the edge surface (47) and the rake angle line (P) ,
A plurality of cutting blades (32) are integrally formed around the shaft portion (31),
The cutting blade (32) includes a first blade portion (41) including a blade edge (40) and a second blade portion (42) continuous to the first blade portion (41).
The second blade angle (a1) sandwiched between the rake angle line (P) and the second cutting edge surface (48) of the second blade portion (42) is set smaller than the rake angle (b),
The cutting blade (32) includes a first blade portion (41), a second blade portion (42), and a third blade portion (43) continuous to the second blade portion (42),
The third blade portion (43) has a third cutting edge surface (49) continuous with the second cutting edge surface (48) and a base rake surface (45) continuous with the rake surface (44) of the first blade portion (41). With
The third blade angle (a2) sandwiched between the third cutting edge surface (49) and the base rake face (45) is set smaller than the rake angle (b),
The rotation characterized in that the cutting edge angle (a), the second cutting edge angle (a1), and the third cutting edge angle (a2) are set so as to satisfy the inequality (a1 <a <a2). blade.

A small electric device comprising: the rotary blade (16) according to claim 1; and drive means for rotationally driving the rotary blade (16).