JP5435561B2 - Rotating blade and small electric device having the rotating blade - Google Patents

Description

  The present invention relates to a rotary blade applied to a rotary electric razor, a hair ball remover, and the like, and a small electric device including the rotary blade. The blade body constituting the inner blade is formed by etching, electroforming, or press working.

  The inner blade (rotary blade) in a general rotary electric shaver is composed of a dozen spiral blades, a plastic-molded round shaft inner blade support, and a metallic material embedded in the inner blade support. It is comprised with the inner blade axis | shaft (patent document 1). The spiral blade is insert-fixed at the time of forming the inner blade support and integrated with the inner blade support. The formed spiral blade is ground to form a cutting edge at the tip of the blade. Since the cutting blades are continuous in a spiral shape, it is possible to show a sharp sharpness by cutting off the beard that has entered the blade holes of the outer blade.

  With regard to the structure of this type of inner blade (rotating blade), a sheet-like inner blade body is formed by an etching method, and the obtained inner blade body is wound around and fixed to a circumferential surface of a round bar-shaped inner blade support. Known (Patent Document 2). On the surface of the inner blade body, ribs that are inclined obliquely with respect to the central axis of the inner blade support are formed at regular intervals, and small holes are formed at regular intervals in the thin portion between adjacent ribs. is there.

  In Patent Document 3, a primary electrodeposition layer is formed on the surface of a base material sheet by electroforming, and the obtained primary electroformed sheet is loaded on the inner surface of a cylinder and rounded, and the inner surface of the primary electroformed sheet It is disclosed that after forming the secondary electrodeposition layer, the primary electroformed sheet is peeled off to constitute the inner blade body. The obtained inner blade body is formed in a seamless cylindrical shape, and a group of mesh blade-shaped blade holes and a group of cutting blades are formed on the circumferential surface of the cylinder. The cylindrical inner cutter body is fixed to the peripheral surface of the cage-like inner cutter frame.

  Regarding the processing technique of the rotary blade of the present invention, it is known that a sheet-shaped inner blade blank is formed by an etching method, and the inner blade body is formed by performing plastic working on the inner blade blank (Patent Document 4). However, the application target of the inner blade of Patent Document 4 is limited to a reciprocating electric shaver, and its cross-sectional shape is formed in an inverted U shape.

Japanese Patent No. 2903056 (page 2, left column, lines 38-48, Fig. 1) Utility Model Registration No. 2502183 (page 2, left column, lines 30-45, FIG. 1) JP 59-28586 (page 2, upper left column, line 15 to lower left column, line 9, line 3) JP 2006-314835 A (paragraph number 0027, FIG. 7)

  According to the inner blade of Patent Document 1, it is possible to efficiently introduce whiskers and cut efficiently. In addition, the sharpness can be exhibited by cutting the whiskers with a cutting blade inclined obliquely with respect to the rotation center axis of the inner blade. However, since the spiral blade is supported by the solid inner blade support, the fluff tends to accumulate at the proximal end portion of the spiral blade. Moreover, when removing the fouling adhering to the spiral blade, it is necessary to sweep out the fouling for each individual spiral blade with a brush, which takes time and effort to clean up the fuzz. In many cases, the electric razor can be washed with water to reduce the labor of cleaning.

  In the inner blade (rotating blade) of Patent Document 2, the inner blade body is composed of a thin electroformed sheet, and the inner blade body is wound around and fixed to the peripheral surface of the inner blade support body. It is difficult to ensure the roundness of the inner blade with the elastic restoring force of the blade body. In addition, a masking pattern is formed on one side of the stainless steel plate, and the blade portion is formed by etching the non-masking portion with an etching solution, and the cutting edge is formed by grinding the tip of the blade portion. It is inevitable that the angle increases.

  In that respect, according to the inner cutter body of Patent Document 3, a seamless cylindrical inner cutter body formed by electroforming is obtained, so there is no need to consider the problems of elastic restoring force and residual stress. However, in the process of bending the electroformed mother die into a cylindrical shape, the electric insulating film may be cracked, resulting in poor yield when manufacturing the inner blade. Further, like the inner blade of Patent Document 2, there is a problem in that the angle of the cutting blade is large and it is difficult to exhibit a sharp sharpness.

  As described above, the conventional inner blade using an inner blade body formed by etching or electroforming as a cutting element is simpler in structure than the inner blade using a spiral blade as a cutting element, but the yield is poor. There is room for improvement in that it is difficult to form a sharp point and a cutting edge.

  An object of the present invention is to provide a rotary blade capable of efficiently performing a cutting process while exhibiting a sharpness while effectively introducing a cutting object such as a beard or a hairball. An object of the present invention is to improve the yield of a rotary blade with sharpness and to reduce its manufacturing cost.

  The rotary blade according to the present invention is formed in a cylindrical shape including a blade body 20 and a blade holder 21 that supports the blade body 20. The blade body 20 is provided with a group of rib-shaped small blades 24 and 25 and a group of blade holes 26. The small blades 24 and 25 include an outer cut surface 44, an inner non-cut surface 45, a pair of side portions 46 and 47 formed between the both 44 and 45, and the cutting surface 44 in the rotational direction. A cutting edge 48 formed on the side and a clearance edge 49 formed on the lower side in the rotational direction of the cutting surface 44 are provided. The center of the width of the non-cut surface 45 is shifted from the center of the width of the cut surface 44 to the lower side in the rotational direction, so that the cutting edge angle θ1 of the cutting edge 48 is smaller than the edge angle θ2 of the relief edge 49.

  The rib-shaped blade 24 is formed in an inclined state with respect to the rotation center axis.

  The blade body 20 is provided with a group of rib-shaped first blades 24 and a group of second blades 25 that intersect each other. The group of first blades 24 and the group of second blades 25 are formed so as to be inclined in opposite directions with respect to the rotation center axis. That is, the blade body 20 is formed in an expanded metal shape by the two small blades 24 and 25.

  The cutting blade angle θ3 of the cutting blade 48 at the intersection of the first small blade 24 and the second small blade 25 is set to be smaller than the cutting blade angle θ1 of the cutting blade 48 of the other portion of both the small blades 24 and 25.

  The blade body 20 is formed in a quadrilateral shape. A peripheral frame 27 that continues to the small blades 24 and 25 is formed endlessly along each side of the blade body 20.

  The peripheral frame 27 of the blade body 20 includes a pair of long side peripheral frames 27a that constitute the long side part and a pair of short side peripheral frames 27b that constitute the short side part. A cutting edge 48 is formed on the upper side in the rotational direction of the cutting surface 44 of the long side peripheral frame 27a.

  The peripheral frame 27 of the blade body 20 includes a pair of long side peripheral frames 27a that constitute the long side part and a pair of short side peripheral frames 27b that constitute the short side part. The blade body 20 is formed in a parallelogram shape by inclining the long side peripheral frame 27a with respect to the rotation center axis.

  The cross-sectional width b1 of the long side peripheral frame 27a is set to be the same as the cross-sectional width b2 of the small blades 24 and 25.

  In the small electric apparatus having the rotary blade of the present invention, the rotary blade is rotated by motor power.

  In the present invention, the width center of the non-cutting surface 45 of the small blades 24 and 25 is shifted from the width center of the cutting surface 44 to the lower side in the rotational direction, and the cutting edge angle θ1 of the cutting edge 48 is changed to the edge angle of the relief edge 49. Since it is smaller than θ2, the cutting edge 48 can be sharpened. Therefore, the rotary blade which can cut | disconnect the cutting | disconnection object efficiently can be obtained by effectively cut | disconnecting the whisker captured by the blade hole 26 with both the small blades 24 and 25.

  When the rib-shaped small blade 24 is inclined obliquely with respect to the rotation center axis, the whisker captured in the blade hole 26 can be cut obliquely by the cutting blade 48, so that the sharpness of the cutting blade 48 is further sharpened. Similarly to the inner blade having a spiral blade as a cutting element, the cutting object can be effectively cut, and the cutting operation can be performed more efficiently. The small blade in this case can be configured with either the first small blade 24 or the second small blade 25 shown in FIG. 5, in which case, for example, as shown in FIG. It is better to secure the structural strength of the blade by connecting with.

  When the group of first blades 24 and the group of second blades 25 that intersect each other are inclined in directions opposite to each other with respect to the rotation center axis, the blade body 20 is configured in an expanded metal shape. The total length can be increased significantly. Further, when cutting a beard using a rotary blade, it is possible to cut the whisker alternately while causing comb hairs with the two small blades 24 and 25 having different inclination directions, so that the beard cutting can be performed more efficiently as a whole. Since the fluff that has entered the inner surface of the rotary blade can be easily washed away with water, the hygienic state can always be maintained.

  When the cutting edge angle θ3 of the cutting blade 48 at the intersecting portion is smaller than the cutting blade angle θ1 of the cutting blade of the other portion, the sharpness of the cutting blade 48 at the intersecting portion is sharper than other cutting blade portions. can do. A cutting object such as a beard that has entered the blade hole 26 is obliquely cut by the inclined small blades 24 and 25, but a part of the cutting object is an intersecting portion along the oblique both small blades 24 and 25. There is a tendency to be guided to. Therefore, the cutting objects gathered at the intersecting portion can be reliably cut with the cutting blade 48 having the smallest cutting blade angle θ3.

  When an endless peripheral frame 27 is provided on the periphery of the blade body 20 formed in a quadrilateral shape, and the end portions of the small blades 24 and 25 intersecting each other are continued to the peripheral frame 27, the structural strength of both the small blades 24 and 25 is increased. Thus, the strength of the blade body 20 can be increased. Further, the small blades 24 and 25 can be formed without waste in the entire region surrounded by the peripheral frame 27, and the cutting opportunity by the cutting blade 48 can be increased.

  When the blade body 20 is formed in a parallelogram shape, the cutting resistance at the time of cutting can be applied to the blade body 20 in a state of being distributed in the longitudinal direction of the long side peripheral frame 27a. Specifically, since the position at which the blade body 20 begins to come into sliding contact with the outer blade 10 changes from one end side to the other end side of the long side peripheral frame 27a of the blade body 20, the cutting resistance acting on each of the small blades 24 and 25 The cutting resistance acting on the rib-shaped blades 24 and 25 can be reduced. Further, when the cutting edge 48 is formed on the long side peripheral frame 27a, the cutting edge 48 can be tilted so that the whiskers can be cut in the same manner as the small blades 24 and 25.

  When the cross-sectional widths b1 and b2 of the long side peripheral frame 27a and the small blades 24 and 25 are set to be the same, the long side periphery when the blade blank 43 formed with the small blades 24 and 25 and the blade hole 26 is bent. The deformation stress of the frame 27a and the small blades 24 and 25 can be made the same. Therefore, the shape accuracy of the blade body 20 can be improved by bending the blade blank 43 into a uniform partial arc shape.

  According to the small electric device having the rotary blade according to the present invention, the rotary blade is driven by motor power to effectively introduce a cutting target such as a beard or a hairball into the rotary blade and efficiently cut it. Therefore, cutting processes such as shaving and hairball removal can be performed efficiently.

It is a vertical side view of a main blade. It is a front view of an electric razor. It is a front view of an inner blade (rotary blade). It is a disassembled perspective view of an inner blade (rotating blade). It is a top view of a blade blank. (A)-(c) is sectional drawing which follows the aa line, bb line, and cc line in FIG. It is a bottom view of an inner blade blank. (A)-(c) is sectional drawing which shows the resist film structure at the time of an etching. It is sectional drawing which shows the process of an inner blade (rotating blade). It is an expanded view which shows the welding structure of a blade main body. It is sectional drawing which shows the process of an inner blade (rotating blade). It is a top view which shows another Example of a blade main body. It is an expanded view which shows the welding structure of the blade main body of FIG. It is a perspective view which shows another Example of a blade holder. It is sectional drawing which shows another Example of a rotary blade. It is sectional drawing of another Example of a small blade. It is a front view which shows another example of application of a rotary blade. It is a principal part bottom view which shows another Example of the cross | intersection part of a small blade. It is a front view which shows another example of application of a rotary blade. It is a front view which shows another example of application of a rotary blade. It is a front view which shows another example of application of a rotary blade. It is sectional drawing which shows another Example of a rotary blade. It is sectional drawing which shows another processing form of a blade main body. It is a top view of the blade main body formed with another processing form. It is sectional drawing which shows another processing form of a blade main body. It is a top view of the blade main body formed with another processing form. It is a top view which shows another Example of a blade main body.

  1 to 11 show an embodiment in which a rotary blade according to the present invention is applied to an inner blade of a rotary electric shaver. In FIG. 2, the electric razor includes a main body portion 1, a head portion 2 supported by the main body portion 1, an outer frame 3 attached to the main body portion 1, and a shaving unit ( (Not shown). The outer frame 3 also serves as a decorative frame, and constitutes an electric razor grip in cooperation with the main body 1. A switch button 4 for turning on / off the energization state of the motor 12 is provided at one upper end of the outer frame 3.

  A rechargeable battery 5 and a circuit board 6 are incorporated in the main body 1. The circuit board 6 has a switch that is switched by the previous switch button 4, an LED for an indicator lamp 7, and a control circuit. And electronic components that constitute the power supply circuit are mounted.

  The head portion 2 is provided with a main blade including an outer blade 10 and an inner blade (rotating blade) 11, and further transmits a motor 12 for driving the inner blade 11 and the rotational power of the motor 12 to the inner blade 11. A drive structure is provided. The drive structure is composed of a group of gear trains 13. The outer blade 10 is formed of a sheet-like mesh blade formed by an etching method or an electroforming method, and the front and rear edges thereof are supported by the outer blade holder 14 and held in an inverted U shape. The head portion 2 is supported by the main body case 1 so as to be able to float in the vertical direction, and the head portion 2 and the main body case 1 are sealed with waterproof packing.

  The outer blade holder 14 is detachably attached to the head frame 15 of the head unit 2 and is held in a non-separable manner by a pair of left and right lock buttons 16 incorporated in the head frame 15. When the left and right lock buttons 16 are pushed in at the same time, the engagement by the lock buttons 16 is released and the outer blade holder 14 can be detached from the head frame 15. Thereby, the inner blade 11 is exposed, and the upper surface of the head frame 15 and the hair adhering to the inner blade 11 can be washed with water.

  3 and 4, the inner blade 11 includes three blade bodies 20, a blade holder 21 that supports the blade body 20, an inner blade shaft (blade support shaft) 22 that is fixed to the blade holder 21, and the like. . The inner cutter shaft 22 is the rotation axis of the inner cutter 11. The blade body 20 is formed by subjecting a rectangular (quadrangle) sheet-like blade blank 43 that is long to the left and right to plastic processing to form a circular arc with the same circumferential curvature, and so on in the circumferential direction with respect to the blade holder 21. Fixed at intervals. The radial dimension of the inner surface of the blade body 20 is made to coincide with the radial dimension of arc peripheral surfaces 37 and 39 of the blade holder 21, which will be described later, and the arc width is set slightly smaller than the circumferential width of the arc peripheral surfaces 37 and 39. .

  As shown in FIG. 5, on the sheet surface of the blade body 20, a group of linear rib-shaped first blades (small blades) 24, a group of linear rib-shaped second blades (small blades) 25, A group of rhombus blade holes 26 surrounded by these small blades 24 and 25 and a peripheral frame 27 surrounding the periphery of the blade body 20 are provided. The group of first blades 24 and the group of second blades 25 are formed so as to be inclined by 15 degrees in opposite directions with respect to the rotation center axis of the inner blade 11, respectively. The entire cutting region R is formed in an expanded metal shape. The adjacent pitch between the small blades 24 and 25 is about 2.7 mm. Seven straight ribs constituting both the small blades 24 and 25 are formed in the circumferential direction of the blade body 20.

  As described above, when the group of first blades 24 and the group of second blades 25 are provided in an expanded metal shape on the sheet surface of the blade body 20, compared to a conventional inner blade having a spiral blade as a cutting element. The total length of the cutting blade can be increased, and the cutting blades 24 and 25 having different inclination directions can be cut alternately while causing comb hairs. Furthermore, since the opening area of the blade hole 26 is significantly larger than that of a conventional inner blade having a mesh blade structure, the beard is effectively introduced in the same manner as the inner blade having a spiral blade as a cutting element. Can be done efficiently.

  The peripheral frame 27 is formed in an endless frame shape with a pair of long side peripheral frames 27a constituting the long side portion and a pair of short side peripheral frames 27b constituting the short side portion. The ends of the first first blade 24 and the second second blade 25 are continuous with the long-side peripheral frame 27a or the short-side peripheral frame 27b, respectively. The cross-sectional width b1 of the long side peripheral frame 27a and the cross-sectional width b2 of the small blades 24 and 25 are set to the same dimension (0.45 mm). The width dimension of the left and right short side peripheral frames 27b is 2 mm, which is wider than the cross-sectional width b1 of the long side peripheral frame 27a, and for fixing the blade body 20 to the blade holder 21 along the periphery. A fixing claw 29 is formed on the front and rear ends of the short side peripheral frame 27b. As described above, the peripheral frame 27 is formed in an endless frame shape, and the end portions of the two small blades 24 and 25 that intersect each other are connected to the peripheral frame 27, thereby improving the structural strength of the two small blades 24 and 25. Thus, the strength of the blade body 20 can be increased.

  The fixed portion 28 and the fixed claw 29 are formed as a recess recessed from the outer peripheral surface of the blade body 20 by half etching. The depth of the recess by the half etching process is approximately half of the thickness of the stainless steel plate 42. A rectangular positioning hole 30 is formed in the front and rear center of the fixed portion 28, and the positioning hole 30 is formed simultaneously in the course of etching the stainless plate member 42 as will be described later. A cutting edge fixing portion 31 similar to the fixing portion 28 is also provided in the cutting region R surrounded by the peripheral frame 27.

  Specifically, the cutting blade fixing portion 31 is formed on the lower side in the rotational direction of the inner blade 11 at the intersection of the two small blades 24 and 25. The cutting blade fixing portion 31 is formed as a concave portion by half-etching similarly to the fixing portion 28, and these half-etched portions are indicated by dotted lines in FIG. In this embodiment, the intersecting portion (five places) of the two blades 24 and 25 located at the center of the cutting region R in the left-right width direction is separated from this center position by one third of the left-right width of the cutting region R. The cutting blade fixing portions 31 are provided at the intersecting portions (5 locations each) of the two small blades 24 and 25 at the above positions. The three blade bodies 20 have the same shape and the same size.

  In FIG. 4, the blade holder 21 is integrated by welding two blade receivers (blade receiving portions) 34 and three cutting blade supports (cutting blade support portions) 35 to the inner blade shaft 22. . The blade receivers 34 are arranged at both side ends of the blade holder 21, and the three cutting blade supports 35 are arranged at equal intervals between the two blade receivers 34, so that the cutting region R of the blade body 20 is formed on the inner surface. Support from the side. Of the three cutting blade supports 35, the central cutting blade support 35 is located at the center in the left-right direction of the inner blade 11. The blade receiver 34 is formed of a stainless steel disc having a circular basic shape, and a trapezoidal claw receiving portion 36 that is opened at the circumferential surface of the disc is cut at regular intervals at three locations around the disc. It is not formed. Positioning pins (positioning protrusions) 38 project from the circumferential center of the circular arc surface 37 sandwiched between the claw receiving portions 36.

  The cutting blade support 35 is formed in the same manner as the blade receiver 34, but is different from the blade receiver 34 in that the positioning pins 38 on the circular arc peripheral surface 39 are omitted. The cutting blade support 35 is fixed at a position corresponding to the previous cutting blade fixing portion 28. The inner cutter shaft 22 is made of a stainless steel round shaft, and after the finish grinding is completed, the final gear 40 (see FIG. 2) is fixed to one of the shaft ends.

  The blade blank 43 is formed by etching a stainless steel plate (metal sheet) 42 having a thickness of 0.254 mm. As shown in FIG. 6, the basic cross-sectional shapes of the first blade 24 and the second blade 25 are as follows: an outer cut surface 44, an inner non-cut surface 45, and edges of both 44 and 45. A pair of side portions 46 and 47 which are bent in a curved state are formed into a hook shape which is obliquely distorted. A cutting edge 48 is formed on the upper side in the rotation direction of the cutting surface 44 by the one side portion 46 and the cutting surface 44, and the lower side in the rotation direction of the cutting surface 44 is formed by the other side portion 47 and the cutting surface 44. A clearance edge 49 is formed on the surface. A groove 50 is formed in the center of the cut surface 44 along the longitudinal direction of each of the blades 24 and 25. By providing the groove 50 in this way, the contact friction of the cut surface 44 against the outer blade 10 can be reduced. In each figure, the rotation direction of the inner blade 11 is indicated by an arrow M. 6A to 6C are cross-sectional views taken along the lines aa, bb, and cc in FIG. 7, and the angle θ1 of the cutting edge 48 is 25 degrees, and θ2 is 60. Degree, θ3 is 20 degrees.

  In the process of forming the blade blank 43, as shown in FIG. 8, after the resist films 55 and 56 are formed on both the front and back surfaces of the stainless steel plate (metal sheet) 42, respectively, the exposed portions are removed, and the non-exposed portions are removed. The plate material surface surrounded by the resist films 55 and 56 is etched with an etching solution. At this time, the width of the resist film 55 on the front side is made larger than the width of the resist film 56 on the back side, and the width center of the resist film 56 on the back side is lower than the width center of the resist film 55 on the front side. Move it to the side. In addition, the cross section of the small blades 24 and 25 of FIG. 8 (a)-(c) respond | corresponds to the cross section of the small blades 24 and 25 of FIG. 6 (a)-(c).

  As described above, when the width of the resist film 55 on the front side is made larger than the width of the resist film 56 on the back side, the exposed area on the back side of the stainless steel plate material 54 becomes larger than the exposed area on the front side, and accordingly, the exposed area on the back side. The degree of etching increases. In addition, the curved surfaces grown from both the front and back surfaces finally become one curved surface to form the side portions 46 and 47, but the width center of the resist film 56 on the back side is from the width center of the resist film 55 on the front side. Since the rotation direction is shifted to the lower side, the bending depth of the curved surface on the cut surface 44 side is larger than the depth of the curved surface on the non-cut surface 45 side. As a result, the center of the width of the non-cutting surface 45 is shifted from the center of the width of the cutting surface 44 to the lower side in the rotational direction by the dimension T (see FIG. 6). It can be made sharper and sharper than the edge angle θ2. The cutting blade 48 is also formed on the upper side in the rotational direction on the cutting surface 44 side of the long side peripheral frame 27a.

  Similarly, at the intersection of the first blade 24 and the second blade 25, the cutting edge angle of the cutting blade 48 at the intersection is greatly shifted by shifting the width center of the exposed portion on the back side from the width center of the exposing portion on the front side. If θ3 is 20 degrees, it can be made smaller than the cutting edge angle θ1 (25 degrees) of the cutting edge of the other part of both small blades 24 and 25. Therefore, the sharpness of the cutting blade 48 at the intersecting portion can be further sharpened compared to other cutting blade portions. Both the small blades 24 and 25 are inclined in directions opposite to each other with respect to the rotation center axis of the inner blade 11. For this reason, the beard that is captured by the blade hole of the outer blade 10 and enters the blade hole 26 can be cut obliquely to exhibit sharp sharpness. Further, the whisker that has entered the blade hole 26 tends to be guided along the oblique cutting edge 48 to the intersecting portion of the two small blades 24 and 25, and accordingly, the cutting at the intersecting portion where the cutting blade angle θ3 is the smallest. The blade 48 can cut the beard more sharply.

  By cutting the blade blank 43 obtained by etching using a mold, a blade body 20 is obtained that is bent into a circular arc shape having the same circumferential curvature as shown in FIG. 9B. . At this time, since the groove 50 is formed along the longitudinal direction of each of the small blades 24 and 25, the blade blank 43 can be easily bent while suppressing the occurrence of internal distortion. After the blade blank 43 is bent into a circular arc shape, the fixed claw 29 is bent in the opposite direction. As described above, when the blade blank 43 is plastically processed to form the blade body 20 in a circular arc shape having the same curvature in the circumferential direction, the blade body 20 can maintain an appropriate bent shape with its own shape retaining force. Note that the circular arc shape having the same circumferential curvature is not only when the circumferential curvature is exactly the same, but also when the circumferential curvature of the blade body 20 is partially different, for example, both circumferential ends. The case where the radius of curvature of the (long-side peripheral frame 27a portion) is slightly smaller (or slightly larger) than other portions is included. The reason will be described later.

  The obtained blade body 20 is assembled to the blade holder 21 as follows. First, one blade body 20 is elastically deformed in an expanded shape to widen the gap between the fixed claws 29. In this state, the positioning holes 30 are engaged with the positioning pins 38, and then the left and right fixed claws 29 are moved to the claw receiving portions 36. The inner surface of the fixed portion 28 is brought into close contact with the arcuate circumferential surface 37 of the blade receiver 34. As a result, the blade body 20 is positioned by the left and right positioning pins 38 and the claw receiving portion 36.

  In the above-described state, the cutting blade fixing portions 31 provided at three locations in the width direction of the blade body 20 are spot-welded to the arc peripheral surface 39 of the cutting blade support 35, and the left and right fixing portions 28 are further connected to the blade receiver. Spot welding is performed on the arc peripheral surface 37 of 34. At this time, since the fixing portion 28 and the cutting blade fixing portion 31 are formed thinner than other portions by half etching, spot welding can be performed more reliably. The spot mark is not exposed on the surface of the blade body 20. Similarly, the cutting blade fixing portions 31 and the fixing portions 28 of the remaining two blade main bodies 20 are spot-welded to the cutting blade support 35 and the blade receiver 34.

  When spot welding each blade body 20, as shown in FIG. 10, the cutting blade fixing portion 31 is welded at five intervals in the circumferential direction as indicated by reference numeral 60, and the fixing portion 28 is indicated by reference numeral 59. As shown in Fig. 8, the eight parts in the circumferential direction are welded at equal intervals. As described above, when the number of fixing points in the cutting blade fixing portion 31 is set to be smaller than the number of fixing points in the fixing portion 28 of the blade body 20, the cutting region R is cut while preventing distortion of the cutting region R as much as possible. It is possible to reliably prevent the blade support 35 from being lifted off. As a result, as a whole, 16 locations on both the left and right ends of the blade body 20 and 15 locations in the cutting area are firmly fixed to the blade holder 21. In addition, when four rows of cutting blade supports 35 are provided along the axis of the inner blade shaft 22 and there are five welding points in the circumferential direction, the total number of welding points in the cutting region R is twenty. The number of fixed points in the present invention is larger than the fixed points (16 points) in the cutting blade fixing part 31, but the number of fixed points in the present invention is a comparison for each fixed point row in the circumferential direction. This includes cases where the total number of welds is large. The left and right ends of the blade body 20 and 15 points in the cutting area can be firmly fixed to the blade holder 21. In addition, since the cutting blade fixing portion 31 is recessed on the side of the clearance edge 49 at the intersection of the two small blades 24 and 25 having a high structural strength, the thermal strain associated with spot welding is minimized, and the blade body 20 deformation can be prevented.

  As shown in FIG. 11 (a), since the positioning pin 38 protrudes from the outer surface of the blade body 20 in the former stage body of the inner blade obtained through spot welding, rough grinding is performed as shown in FIG. 11 (b). The positioning pins 38 are ground until they are flush with the surface of the blade body 20. Further, finish grinding is performed to shape the peripheral surface of each blade body 20 and finish the diameter and roundness of the outer peripheral surface of the inner blade 11 to a predetermined state. Thus, since the roundness of the rotary blade (cut surface 44) can be sufficiently ensured by grinding the blade body 20, the circumferential curvature of the blade body 20 is partially reduced as described above. There is no problem even if it is slightly different. Even if the grinding finish is not performed, it can be used without any problem if the radius of curvature is smaller than other parts, and the concept of roundness in the present invention is such that the curvature in the circumferential direction is partially The case of slightly different is included.

  As shown in FIG. 3, the obtained inner blade 11 is entirely formed in a hollow cylindrical shape or a cylindrical bowl shape, and can maintain a hollow cylindrical structure by the self-shaping force of the blade body 20 and the support action of the blade holder 21. . Thus, according to the inner cutter 11 configured in a hollow cylindrical shape, the cut flakes can be dropped into the inner cutter 11 and further dropped into the fluff storage chamber below the inner cutter 11, so that the blade body 20 It is possible to effectively introduce whiskers by preventing the staying of hair chips. Moreover, at the time of cleaning by washing with water, it is possible to promote the discharge of the fluff that has entered the inner surface of the blade body 20, and to always maintain a sanitary state. It should be noted that the dust that has fallen into the internal space of the inner blade 11 can be discharged from the gap between the adjacent blade bodies 20 in a state of facing the claw receiving portion 36, and further discharged from the blade hole 26 having a large opening area. In this way, it is possible to quickly wash away hair chips and sebum. The structure of the three blade bodies 20 constituting the inner blade 11 has the same shape and the same dimensions including the small blades 24 and 25, and each blade body 20 is fixed to the peripheral surface of the blade holder 21 at regular intervals. Therefore, the weight balance of the inner blade 11 during rotation can be made uniform. Therefore, the inner blade 11 can be always driven to rotate in a stable state, and the occurrence of vibration can be prevented.

  12 and 13 show another embodiment of the blade body 20. In this case, the long side peripheral frame 27a is inclined with respect to the rotation center axis of the inner blade 11, and the blade body 20 is formed in a parallelogram shape. The long side peripheral frame 27a is inclined in the same direction as the first small blade 24 by the same angle. Thus, when the blade body 20 is formed in a parallelogram shape, the cutting resistance at the time of cutting the whiskers can be applied to the blade body 20 in a state of being distributed in the longitudinal direction of the long-side peripheral frame 27a. Specifically, the position at which the blade body 20 starts to come into sliding contact with the outer blade 10 changes from one end side to the other end side of the long side peripheral frame 27a of the blade body 20, so that the cutting resistance acting on each of the small blades 24 and 25 is changed. And the cutting resistance acting on the two blades 24 and 25 can be reduced. In addition, the cutting blade 48 formed on the long side peripheral frame 27a is also inclined so that the whiskers can be cut in the same manner as the small blades 24 and 25.

  After the blade body 20 is assembled to the blade holder 21 as shown in FIG. 13, the fixing portion 28 and the cutting blade fixing portion 31 are welded and fixed to the blade receiver 34 and the cutting blade support 35, respectively. In this case, since an oblique gap is opened between the blade bodies 20 adjacent to each other in the circumferential direction, even when an external force is applied to the outer blade 10 so as to press the blade surface against the inner blade 11. The outer blade 10 can be prevented from sagging from the previous gap. Since others are the same as the previous embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted. The same applies to the following embodiments.

  FIG. 14 shows another embodiment of the blade holder 21. In this case, the blade receiver 34, the cutting blade support 35, and the boss portion 63 were integrally formed by injection molding, and the inner blade shaft 22 was fixed by insert. Although not shown, welding arcs 37 and 39 are formed with welding projections, respectively. Further, the fixing portion 28 and the cutting blade fixing portion 31 of the blade body 20 are formed with holes that engage with the projections for welding. The blade body 20 in this case is welded and fixed to the blade holder 21. If necessary, the blade holder 34, the cutting blade support 35, the boss portion 63, and the inner blade shaft 22 can be configured integrally to form the blade holder 21.

  The blade receiver 34 and the cutting blade support 35 of the blade holder 21 can be formed in a triangular shape as shown in FIG. 15A, and in that case, the blade receiver 34 and the cutting blade support 35 Only the long peripheral frame 27a of each blade body 20 can be supported by the blade receiver 34 and the cutting blade support 35 by providing the arc peripheral surfaces 37 and 39 only at the top. In this case, the fixing claw 29 is omitted. The blade body 20 is arranged at equal intervals in the circumferential direction with respect to the blade holder 21. Thus, even when only the circumferential end of the blade body 20 is supported by the blade receiver 34 and the cutting blade support 35, the plastically processed blade body 20 has a partial arc shape (a cross-sectional arc shape with the same circumferential curvature). ) Can be held by itself, so that the small blades 24 and 25 do not dent to the inner surface side due to external force. In the inner blade 11 in this embodiment, the three blade bodies 20 are arranged at equal intervals in the circumferential direction, so that the weight balance of the inner blade 11 during rotation can be made uniform and the occurrence of vibration can be prevented.

  The blade receiver 34 and the cutting blade support 35 can be formed in a hexagonal shape as shown in FIG. The inner blade 11 in this case is configured by fixing two blade bodies 20 bent in a semicircular shape to a blade holder 21. The blade body 20 is supported by a blade receiver 34 and a cutting blade support 35 at a peripheral frame 27 and two midway portions of the cutting region R. The blade body 20 is arranged at equal intervals in the circumferential direction with respect to the blade holder 21, and the fixed claws 29 are omitted as in the previous embodiment. In the inner blade 11 in this embodiment, the two blade main bodies 20 are arranged at equal intervals in the circumferential direction, so that the weight balance of the inner blade 11 during rotation can be made uniform and the occurrence of vibration can be prevented.

  The blade receiver 34 and the cutting blade support 35 can be formed in a bobbin shape as shown in FIG. Further, the two blade bodies 20 can be fixed so as to be adjacent to each other with a large gap therebetween, with the circumferential length being smaller than that of the blade body 20 of FIG. The blade body 20 is arranged at equal intervals in the circumferential direction with respect to the blade holder 21, and the fixed claws 29 are omitted as in the previous embodiment. In the inner blade 11 in this embodiment, the two blade main bodies 20 are arranged at equal intervals in the circumferential direction, so that the weight balance of the inner blade 11 during rotation can be made uniform and the occurrence of vibration can be prevented.

  FIG. 16 shows another embodiment of the sectional shape of each of the small blades 24 and 25. In this case, similarly to the small blades 24 and 25 described in FIG. 6, the width center of the non-cutting surface 45 is shifted by a dimension T from the width center of the cutting surface 44 to the lower side in the rotation direction, thereby cutting the cutting blade 48. Sharply sharpen the angle θ1. The difference is that the etching edge 51 on the lower rotation side of the non-cutting surface 45 protrudes to the lower rotation side than the escape edge 49 of the cutting surface 44. Thereby, since the small blade width of the rotation direction of the small blades 24 and 25 can be enlarged, it can prevent well that the cut | judged fluff jumps out from the inner side of a rotary blade. Further, since there is no change in the width of the cut surface 44 in the rotational direction, whiskers can be introduced effectively.

  FIG. 17 shows another embodiment of an electric razor. In this case, a guard body 65 for restricting the amount of biting of the rotary blade 11 is provided around the rotary blade 11, and both of these 11 and 65 are driven to rotate by motor power. The guard body 65 is formed in a coil spring shape, and the coil portion is wound around the circumferential surface of the rotary blade 11, and both ends thereof are fixed to the rotary blade 11. The rotary blade 11 of the present invention can also be applied to an electric razor that does not include this type of outer blade.

  In the blades 24 and 25 shown in FIG. 6, the width center of the back side exposed portion is largely shifted from the width center of the front side exposed portion to adjust the depth of the side portions 26 and 27. In this way, the turning depth can also be adjusted by reducing the width dimension b3 of the non-cut surface 45 at the intersection. Specifically, the etching edge 52 on the upper side of the rotation of the non-cut surface 45 is recessed toward the lower side of the uncut surface 45 as the intersection is approached, so that the grooving depth is adjusted.

FIG. 19 thru | or FIG. 21 shows the Example which applied the rotary blade 11 to small electric equipments other than an electric shaver.
FIG. 19 shows an embodiment in which the rotary blade 11 is applied to nail cutting. The nail clipper is housed in the main body 68 by providing a cylindrical head portion 69 at one end of the main body 68 that also serves as a grip, and a rotating blade 11 that rotates around the cylinder axis of the head 69. The rotary blade 11 is driven to rotate by the motor 70. Reference numeral 72 is a secondary battery, and reference numeral 73 is a switch button for starting or stopping the motor 70. A semicircular cutting window 71 is opened in the cylindrical peripheral wall of the head portion 69, and the rotary blade 11 is exposed to the outer surface of the head portion 69 through the window 71. When cutting the nail, the rotary blade 11 in a rotationally driven state is pressed against the tip of the nail, and the nail is scraped off little by little.

  FIG. 20 shows an embodiment in which the rotary blade 11 is applied to a hair ball remover. The fluff remover is provided with a cylindrical head portion 69 at one end of a main body portion 68 that also serves as a grip, and a rotary blade 11 that rotates around the cylinder axis of the head portion 69 is disposed inside the main body portion 68. The rotary blade 11 is driven to rotate by the accommodated motor 70. Reference numeral 72 is a secondary battery, and reference numeral 73 is a switch button for starting or stopping the motor 70. A partial arc-shaped cutting window 71 is opened in the cylindrical peripheral wall of the head portion 69, and the outer blade 10 is exposed to the outer surface of the head portion 69 through the window 71. The fluff is introduced from the blade hole of the outer blade 10 and cut by the inner blade (rotary blade) 11 that is in sliding contact with the inner surface of the outer blade 10. In this case, the outer blade 10 and the rotary blade 11 are sufficiently longer in the axial direction than the nail-cutting rotary blade 11, and therefore the contact area of the rotary blade 11 with respect to the knit fabric is further increased. The hairball can be effectively removed.

  FIG. 21 shows an embodiment in which the rotary blade 11 is applied to a keratin remover. The keratin remover is provided with an arch-shaped head portion 69 at one end of a main body portion 68 that also serves as a grip, and a rotary blade 11 that rotates about an axis orthogonal to the central axis of the main body portion 68 is disposed therein. The rotary blade 11 is driven to rotate by a motor 70 accommodated in 68. Reference numeral 72 is a secondary battery, and reference numeral 73 is a switch button for starting or stopping the motor 70. A cutting window 71 is notched in the peripheral wall of the head portion 69, and the rotary blade 11 is exposed to the outer surface of the head portion 69 through the window 71. When removing the stratum corneum, the rotary blade 11 in a rotationally driven state is pressed against a stratum corneum such as a heel, and the stratum corneum is scraped off little by little.

  FIG. 22 shows still another embodiment of the rotary blade 11. There, two blade bodies 20 having a partial arc shape (a cross-sectional arc shape having the same curvature in the circumferential direction) and one blade body 20 having a semicircular cross-section (a cross-section arc shape having the same curvature in the circumferential direction) are provided. The rotary blade 11 was fixed to the blade receiver 34 and the cutting blade support 35 of the blade holder 21. Thus, according to the rotary blade 11 that fixes the plurality of blade bodies 20 having different lengths in the circumferential direction to the blade holder 21, the weight balance at the time of rotation becomes uneven and vibration is likely to occur. In addition, since the head portion 2 can be vibrated in the vertical direction by the previous vibration, the whisker can be cut while vibrating the outer blade 10 in a direction perpendicular to the skin surface. In that case, it is possible to deeply shave the beard by dripping the skin into the blade hole of the outer blade 10 made of a mesh blade.

  The blade blank 43 does not need to be formed through the process described above. For example, the stainless steel plate 42 cut into a predetermined shape is subjected to plastic working to form a blade blank 43 having a partially arcuate cross section (a cross-sectional arc shape having the same circumferential curvature). Next, after forming resist films 55 and 56 on both the front and back surfaces of the blade blank 43, exposure is performed, the exposed portions are removed, and the plate material surface surrounded by the resist films 55 and 56 in the non-exposed portions is etched with an etching solution. A group of rib-shaped blades 24 and 25 and a group of blade holes 26 are formed. The subsequent processing is as already described.

  As described above, when the stainless steel plate 42 is plastically formed in advance to form the partially arcuate blade blank 43, the stainless steel plate 42 in a homogeneous state is bent, so that the blade blank 43 is bent more accurately. be able to. In addition, since the blade blank 43 bent into a partial arc shape is etched to form the small blades 24 and 25 and the blade hole 26, the cut surfaces 44 of both the small blades 24 and 25 can be formed into an arc surface. The roundness of the inner blade 11 can be ensured only by performing a minimum grinding process, and the angle of the cutting edge 48 can be prevented from being slightly increased by performing the grinding process.

  The blade body 20 can be formed by pressing a sheet-like blade blank 43 formed by an electroforming method. Specifically, as shown in FIG. 23 (a), a photoresist film is formed on the upper surface of a master block 75, a pattern film is placed on the surface, exposed and developed, and then a photoresist that matches the electroformed pattern. A layer 76 is formed, and a primary electroformed layer 77 is formed. Next, as shown in FIG. 23B, a secondary electroformed layer 78 is formed on the outer surface of the primary electroformed layer 77 while flowing the electroforming solution in the direction indicated by the arrow. By peeling off the secondary electroformed layer 78, the blade blank 43 provided with the small blades 24 having a trapezoidal cross section is obtained. Specifically, the unequal trapezoidal small blade 24 can be formed in which the slope 79 on the upper side in the flow direction of the electroforming liquid is small and the slope 80 on the lower side in the flow direction is large.

  Next, by peeling off the secondary electroformed layer 78, a blade blank 43 having a groove (counter sink) 50 on the cut surface 44 side is obtained as shown in FIG. Finally, as shown in FIG. 23 (d), the blade body 43 provided with grooves 50 on the outer surface of the small blade 24 by pressing the blade blank 43 and plastically deforming the entire blade into a curved shape. Can be formed. The center of the non-cut surface 45 is biased toward the inclined surface 80 by the dimension T from the width center of the cut surface 44.

  FIG. 24 is a plan view of FIG. 23 (c). The blade 24 is composed of a straight blade parallel to the long-side peripheral frame 27a, and the groove 50 and the recess (counter sink) of the fixing portion 28 that connects the grooves 50 are shown. Shown in pointillism. The small blades 24 at both ends in this case also serve as the long side peripheral frame 27 a of the blade body 20. The cutting blade 48 and the cutting surface 44 of the small blade 24 are finally finished by grinding.

  The blade body 20 can be formed by pressing as shown in FIGS. In that case, the metal sheet 82 is punched to form a primary blank 83 shown in FIG. The primary blank 83 is formed with a blade hole 26 and a front body 84 of the small blade 24 having a square cross section. Next, the primary blank 83 is subjected to plastic working, and as shown in FIG. 25 (c), the front body 84 is formed in a cross-sectional shape and has a sharp edge 48 and a relief edge 49. 24 is formed. Thereby, the blade blank 43 provided with the some small blade 24 is obtained. Next, as shown in FIG. 25 (d), the blade blank 43 is pressed to form the blade body 20 that is plastically deformed into an outwardly curved shape (circular arc with the same circumferential curvature). . The width center of the non-cut surface 45 is biased toward the side portion 47 side from the width center of the cut surface 44.

  FIG. 26 is a plan view of the blade blank 43 of FIG. 26C, and the small blade 24 is formed by a straight blade parallel to the long side peripheral frame 27a. The fixed portion 28 is formed by press working and is recessed along the short side peripheral frame 27b. This dent is shown in pointillism. The small blades 24 at both ends in this case also serve as the long side peripheral frame 27 a of the blade body 20. The cutting blade 48 and the cutting surface 44 of the small blade 24 are finally finished by grinding.

  FIG. 27 shows still another embodiment of the blade body 20. There, a small blade 24 inclined obliquely with respect to the rotation center axis of the inner blade 11 was provided, and the adjacent small blades 24 were connected by a reinforcing rib 91 to ensure the structural strength of the small blade 24. The reinforcing ribs 91 are provided at regular intervals in the longitudinal direction of the blade 24 in a state orthogonal to the blade 24. Moreover, the fixing | fixed part 28 was recessedly formed in each of a pair of short side surrounding frame 27b, and the cutting blade fixing | fixed part 31 was recessedly formed in the center of the opposing part of a pair of long side surrounding frame 27a. The blade body 20 can be formed by any processing method such as etching, electroforming, and pressing.

  The small blades 24 and 25 and the blade hole 26 can be formed by yet another processing method. Similarly to the above, a precision blanking (plastic working) is performed on the stainless steel plate 42 to form a blade blank 43 having a partially arc-shaped cross section. In the bending process, a group of rib-shaped blades 24 and 25, A group of blade holes 26 are simultaneously punched and formed. After that, edge processing is performed on the small blades 24 and 25 to form the cutting blade 48. The subsequent processing is as already described. Thus, if the blade blank 43 is formed only by plastic processing, the processing cost can be significantly reduced and the cost required for manufacturing the inner blade 11 can be reduced.

The present invention can be implemented in the following forms.
The rotary blade according to the present invention includes a blade body 20 and a blade holder 21 that supports the blade body 20. The blade body 20 includes a group of rib-shaped small blades 24 and 25 and a group of blade holes 26 defined by the rib-shaped small blades 24 and 25. The blade body 20 is formed into a circular arc shape by plastic processing. A plurality of blade bodies 20 having an arcuate cross section are fixed to the peripheral surface of the blade holder 21, and the rotary blade 11 is configured in a cylindrical shape.

  According to the above rotary blade, like a rotary blade using a spiral blade as a cutting element, it is possible to effectively introduce a whisker, a hair ball, etc. into the rotary blade and efficiently cut it. Cutting processing such as ball removal can be performed. In addition, since the plurality of blade bodies 20 are fixed to the peripheral surface of the blade holder 21 to form a rotary blade, there is little residual stress after plastic working, and roundness can be ensured and sharpness can be prevented from being lowered.

  The metal sheet 42 is etched to form a blade blank 43 including a group of small blades 24 and 25 and a group of blade holes 26. The blade blank 43 is subjected to plastic working to form the blade body 20 in a circular arc shape.

  As described above, the metal sheet 42 is etched to form the blade blank 43 having the small blades 24 and 25 and the blade hole 26, and the blade blank 43 is plastically processed to form a blade body 20 having an arcuate cross section. By forming, etching processing and plastic processing can be easily performed with less effort. This is because the flat metal sheet 42 may be etched and the flat blade blank 43 may be plastically processed. Therefore, it is possible to reduce the cost required for processing the blade body 20 having a circular arc cross section and reduce the manufacturing cost of the rotary blade. Moreover, since the sharp cutting edge 48 can be formed by etching, it can be set as the rotary blade which can exhibit a sharp sharpness.

  Contrary to the inner blade 11 described above, the metal sheet 42 is subjected to plastic working to form the blade blank 43 in a circular arc shape. The obtained blade blank 43 is etched to form a group of small blades 24 and 25 and a group of blade holes 26.

  As described above, when the metal sheet 42 is plastically processed to form the blade blank 43 having an arcuate cross section, and the etching is performed to form the small blades 24 and 25 and the blade hole 26, the bent shape of the blade blank 43 is obtained. Can be made more accurate. This is because the metal sheet plate material 42 in a homogeneous state is bent. Further, since the small blades 24 and 25 and the blade hole 26 are formed by etching the partial arc-shaped blade blank 43, the cutting blade 48 can be formed on the curved surface portion, and therefore the rotary blade can be formed by performing a minimum grinding process. 11 roundness can be ensured, and grinding work can be reduced. Also in this case, since the sharp cutting edge 48 can be formed by etching, a rotary blade capable of exhibiting a sharp sharpness can be obtained.

  The metal sheet 42 is plastically processed to form the blade blank 43 in a cross-sectional arc shape. In the process of performing plastic working on the metal sheet 42, a group of small blades 24 and 25 and a group of blade holes 26 are simultaneously punched and formed.

  In the process of forming the blade blank 43 by performing plastic working on the metal sheet 42, if a group of small blades 24 and 25 and a group of blade holes 26 are simultaneously punched and formed, the blade body 20 can be processed with less man-hours. The processing cost of the blade body 20 can be greatly reduced, and the cost required for manufacturing the rotary blade can be reduced.

  The blade body 20 is fixed to the peripheral surface of the blade holder 21 at regular intervals. Thus, according to the inner blade 11 configured by fixing a plurality of blade bodies 20 to the peripheral surface of the blade holder 21 at equal intervals, a plurality of blade bodies 20 having the same structure can constitute a rotary blade. Only one type of blade body 20 needs to be prepared, and the rotary blade can be manufactured at a lower cost than when several types of blade bodies are prepared. Further, since the blade body 20 having the same structure is fixed to the peripheral surface of the blade holder 21 at equal intervals, the weight balance of the rotary blade can be made uniform, and therefore the rotary blade can be driven to rotate in a stable state at all times. There is also an advantage that the sharpness in each blade body 20 can be equalized.

  Fixing portions 28 are provided at both ends in the width direction of the blade body 20 with the cutting region R interposed therebetween. The fixing portions 28 are fixed to the blade receiving portions 34 provided on both side ends in the width direction of the blade holder 21 so as not to be separated by a welding process or a squeezing process.

  As described above, when the fixing portions 28 are provided on both side ends of the blade body 20 outside the cutting region R, and are fixed to the blade receiving portions 34 on both side ends of the blade holder 21 so as not to be separated by welding, but not separable. The blade body 20 can be fixed to the blade holder 21 without adversely affecting the cutting region R. For example, when the fixing portion 28 is welded, the thermal strain accompanying the welding can be prevented from reaching the cutting region R. Further, when the fixing portion 28 is caulked, it is possible to prevent the deformation strain accompanying caulking from reaching the cutting region R. Therefore, it is possible to obtain the rotary blade 11 that can always exert a proper cutting action.

  A cutting blade fixing portion 31 is provided in at least one position in the width direction of the cutting region R of the blade body 20. The cutting blade fixing portion 31 is fixed to a cutting blade support portion 35 provided in the blade holder 21. The number of fixed locations in the cutting blade fixing portion 31 is set to be smaller than the number of fixed locations in the fixed portion 28.

  As described above, when the cutting blade fixing portion 31 is provided in at least one portion of the cutting region R and this is fixed to the cutting blade support portion 35 of the blade holder 21, the cutting region R of the blade body 20 floats away from the blade holder 21. Can be reliably prevented, and the cutting action by the rotary blade can always be exhibited in a stable state. Further, when the number of fixing points in the cutting blade fixing part 31 is set to be smaller than the number of fixing parts in the fixing part 28, the cutting region R is prevented from being lifted off from the cutting blade support part 35, and the blade body 20 is The left and right ends can be firmly fixed to the blade holder 21.

  The blade body 20 is formed by etching the metal sheet 54. Each of the fixing portion 28 and the cutting blade fixing portion 31 of the blade body 20 is formed by a recess that is recessed from the outer peripheral surface of the blade body 20 by half-etching.

  As described above, when each of the fixing portion 28 and the cutting blade fixing portion 31 is formed by a recess that is recessed from the outer peripheral surface of the blade body 20 by half-etching processing, the spot mark and the welding mark are out of the outer peripheral surface of the blade body 20. The fixing portion 28 and the cutting blade fixing portion 31 can be fixed while preventing the protrusion. Therefore, after fixing the blade body 20 to the blade holder 21, it is possible to save the trouble of removing spot marks and welding marks. Further, by welding the fixed portion 28 and the cutting blade fixing portion 31 thinner than others, spot welding can be performed more reliably and in a short time, so that the thermal strain when welding the cutting blade fixing portion 31 is cut. It can be well prevented from reaching the region R.

  A positioning projection 38 is provided on the blade receiving portion 34 of the blade holder 21. With the positioning hole 30 provided in the fixing portion 28 of the blade body 20 engaged with the positioning protrusion 38, the fixing portion 28 and the cutting blade fixing portion 31 are spot welded to the blade receiving portion 34 and the cutting blade support portion 35. To do.

  As described above, when the positioning hole 30 provided in the fixing portion 28 is engaged with the positioning protrusion 38 provided in the blade receiving portion 34, the blade body 20 can be accurately positioned on the blade holder 21. In addition, the fixed portion 28 and the cutting blade fixing portion 31 are spot-welded or thermally welded in a positioned state, so that it is not necessary to use a separate positioning jig, and the blade body 20 can be accurately attached to the blade holder 21. Since it can be assembled, the labor required for welding and welding can be reduced. The positioning protrusion 38 is removed in the process of grinding the rotary blade 11.

  A fixed claw 29 is projected forward and backward from the front and rear ends of the peripheral frame 27 constituting the blade body 20. At a plurality of locations around the blade receiving portion 34, claw receiving portions 36 that open on the peripheral surface thereof are cut out at equal intervals. The blade body 20 is fixed to the blade holder 21 by engaging the fixed claw 29 with the claw receiving portion 36.

  As described above, when the fixed claws 29 provided at the front and rear ends of the peripheral frame 27 are engaged with the claw receiving portions 36 formed on the claw receiving portions 36 to fix the blade body 20 to the blade holder 21, It is possible to reliably prevent the corner from being lifted off from the blade holder 21. Further, when the fixing portion 28 and the cutting blade fixing portion 31 are welded or welded in a state where the fixing claw 29 is engaged with the claw receiving portion 36, the blade body 20 is more reliably moved in the circumferential direction during welding or welding. By restricting, the assembly accuracy of the blade body 20 with respect to the blade holder 21 can be further improved. Since the fixing structure is located on the inner surface side of the blade body 20, the fixing structure does not interfere with the cutting action of the rotary blade.

  The peripheral frame 27 constituting the blade body 20 is composed of a pair of long side peripheral frames 27a constituting the long side part and a pair of short side peripheral frames 27b constituting the short side part. The long side peripheral frame 27a is inclined with respect to the rotation center axis of the inner blade 11, and the blade body 20 is formed in a parallelogram shape.

  As described above, when the long side peripheral frame 27a of the peripheral frame 27 of the main body 20 is inclined with respect to the rotation center axis of the inner blade 11 and the blade main body 20 is formed in a parallelogram shape, the cutting resistance at the time of cutting the beard is reduced. It can be made to act on the blade body 20 in a state of being dispersed in the longitudinal direction of the long side peripheral frame 27a. Specifically, the cutting resistance at the time of cutting can be gradually applied from one end side to the other end side of the long side peripheral frame 27a of the blade body 20, and therefore, the rib-shaped blade 24 can be cut even during high load cutting. -The cutting resistance acting on 25 can be reduced. Further, when the cutting edge 48 is formed using the long side peripheral frame 27a, the cutting object can be cut with the inclined cutting edge 48.

  A groove 50 along the longitudinal direction of the blades 24 and 25 is formed on at least one of the cut surface 44 and the non-cut surface 45 of the blades 24 and 25 of the blade body 20.

  As described above, when the groove 50 along the longitudinal direction of the small blades 24 and 25 is formed in at least one of the cut surface 44 and the non-cut surface 45 of the small blades 24 and 25 of the blade body 20, for example, an inner blade blank The blade blank 43 can be easily processed while suppressing the occurrence of internal strain when the plastic plate 42 is plastically bent and bent into a circular arc shape. Further, since the groove 50 is formed along the longitudinal direction of the blades 24 and 25 to reduce the bending resistance, it is possible to well prevent the narrow blades 24 and 25 from being twisted and deformed during plastic working.

  A groove 50 is formed in the cutting surface 45 of the small blades 24 and 25 of the blade body 20. Thus, if the groove | channel 50 is formed in the cutting surface 45 of the small blades 24 and 25 of the blade main body 20, the contact friction with respect to the outer blade 10 of the cutting surface 44 can be reduced, and the power loss when driving a rotary blade by that much. Can be reduced.

  According to the small electric device having the rotary blade according to the present invention, the rotary blade is driven by motor power to effectively introduce a cutting target such as a beard or a hairball into the rotary blade and efficiently cut it. Therefore, cutting processes such as shaving and hairball removal can be performed efficiently.

  In addition to the above embodiments, the inner blade 11 may be configured in a form including one blade body 20 having a C-shaped cross section or in a form including two or more types of blade bodies 20 having different circumferential lengths. it can. The small blades 24 and 25 do not have to be formed in a straight rib shape, but can be formed by a rib that bends in a meandering shape or a lightning bolt shape. The rotary blade is configured by arranging four, five, or even more blade bodies 20 in the blade holder 21 in addition to arranging two or three blade bodies 20 in the blade holder 21. can do.

11 Rotating blade (inner blade)
20 Blade body 21 Blade holder 24 First blade (small blade)
25 Second blade (small blade)
26 Cutting hole 27 Peripheral frame 44 Cutting surface 45 Non-cutting surface 46/47 Side part 48 Cutting edge 49 Relief edge θ1 Cutting edge angle θ3 Cutting edge angle of cutting edge at intersection

Claims (4)

A rotary blade formed in a cylindrical shape including a blade body (20) and a blade holder (21) supporting the blade body (20),
The blade body (20) is provided with a group of rib-shaped blades (24, 25) and a group of blade holes (26).
The small blade (24, 25) has an outer cut surface (44), an inner non-cut surface (45), and a pair of side portions (46, 47) formed between both (44, 45). ), A cutting edge (48) formed on the upper side in the rotational direction of the cutting surface (44), and a relief edge (49) formed on the lower side in the rotational direction of the cutting surface (44),
The center of the width of the non-cut surface (45) is shifted from the center of the width of the cut surface (44) to the lower side in the rotational direction, and the cutting edge angle (θ1) of the cutting edge (48) is the edge angle of the relief edge (49). A rotary blade formed smaller than (θ2).   The rotary blade according to claim 1, wherein the rib-shaped blade (24) is formed so as to be inclined obliquely with respect to the rotation center axis. The blade body (20) is provided with a group of rib-shaped first blades (24) and a group of second blades (25) intersecting each other,
The rotary blade according to claim 2, wherein the group of first blades (24) and the group of second blades (25) are formed in a state in which they are inclined in opposite directions with respect to the rotation center axis. The small electric equipment which has a rotary blade as described in any one of Claim 1 to 3 with which a rotary blade is rotationally driven by motor power.

Images