JP2012050615A - Rotary blade and compact electric appliance including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary blade wherein inside strength in blade parts is not impaired, and to provide a compact electric appliance including the same.SOLUTION: The rotary blade includes: blade main bodies 20 each bent in an arc shape; an blade support body 21 supporting the blade main bodies 20; and a rotary shaft 22. The blade body 20 includes rib-like small blades (blade parts) 25, 26. The small blade 25, 26 includes: a cutting face 43 of the outer face; a base face 44 of the inner face; a first scooping face 45 and a second scooping face 46 formed between both faces 43, 44; a cutting blade 47 formed on a rotation direction upward side of the cutting face 43; and a relief edge 48 formed on a rotation direction downward side of the cutting face 43. The first scooping face 45 is formed by an inner recessed face recessed to the rotation direction downward side from the cutting face 47, and the second scooping face 46 is formed by an inclined face 46a inclined downward in an inner recessed state toward the rotation downward side from the relief edge 48 and a recessed face 46b connecting the inclined face 46a and an end edge 58 of the base face 44.

Description

  The present invention relates to a rotary blade that is applied to a rotary electric razor, a hair ball remover, and the like, and a small electric device including the rotary blade.

  Inner blades (rotating blades) in a general rotary electric razor are a dozen spiral blades, a plastic molded round shaft-shaped inner blade support shaft, and an inner blade shaft fixed to the inner blade support shaft. (Patent Document 1). The spiral blade is insert-fixed when the inner blade support shaft is formed, and the formed spiral blade is ground to form a cutting blade 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 can be formed by etching or electroforming, and the inner blade body can be wound and fixed on the peripheral surface of a round bar-shaped inner blade support shaft. Known (Patent Document 2). On the surface of the inner blade body, rib-shaped blade portions that are inclined obliquely with respect to the center of rotation of the inner blade support shaft are formed at regular intervals, and small holes are formed at regular intervals in the thin portion between adjacent blade portions. It is formed every other. The obtained inner blade is ground to form a cutting blade at the tip of the blade portion. The cutting blade in this case can also cut the beard.

  Further, regarding the structure of this type of inner blade (rotating blade), a spindle, a pair of left and right disks fixed to the spindle, two cutting blades supported so as to be movable in the radial direction by the disks, and the cutting blades as outer blades An inner blade composed of a spring that presses and urges toward the end is known (Patent Document 3).

Japanese Patent No. 2903056 (page 2, left column, lines 38-48, Fig. 1) Utility Model Registration No. 2502183 (page 3, left column, lines 28-41, Fig. 1) Japanese Patent Application Laid-Open No. Sho 62-152495 (page 2, lower left column, lines 3 to 15, line 3)

  However, since all the patent documents have substantially the same cross-sectional area on the blade edge side (outer side) and the inner cross-sectional area away from the blade edge, the strength on the blade edge side (outer side) and the inner side strength in the blade portion are substantially the same. . If the cross-sectional area of the entire blade portion is reduced in order to reduce the sliding resistance of the cutting surface, the strength of the inner portion is weakened accordingly, and the overall inertial force is also weakened, thereby affecting the cutting performance. It is also a structure in which filings tend to accumulate on the cut surface of the blade portion.

  The objective of this invention is providing the rotary blade which does not weaken the intensity | strength of the radial inside in a blade part, and a small electric equipment provided with this rotary blade.

  The present invention is a rotary blade that includes a blade body 20 bent in an arc shape, a blade support 21 that supports the blade body 20, and a rotary shaft 22. The blade body 20 is a small rib-shaped body. The blades 25, 26 include an outer cut surface 43, an inner base surface 44, and a first and second beveled surfaces 45 and 46 formed between the both 43 and 44. And a cutting edge 47 formed on the upper side in the rotational direction of the cutting surface 43 and a clearance edge 48 formed on the lower side in the rotational direction of the cutting surface 43. The first turning surface 45 includes the cutting edge 47. Are formed with an indented surface that is recessed toward the lower side in the rotational direction, and the second turning surface 46 includes an inclined surface 46a that inclines downward from the escape edge 48 toward the lower side in the rotational direction, and an inclined surface 46a. It is formed by a recessed surface 46 b that connects the end surface 58 of the base surface 44.

  In addition, the second turning surface 46 has an inclined surface 46 a that is inclined downward inwardly from the escape edge 48 toward the lower side in the rotational direction, and an inner recess that connects the inclined surface 46 a and the edge 58 of the base surface 44. The concave surface 46b is formed in a reverse letter shape.

  Further, when the thickness of the inclined surface 46a in the second flanged surface 46 is t1, and the thickness of the inner recessed surface 46b is t2, the inclined surface 46a and the recessed surface 46b are formed so as to satisfy the inequality (t1 <= t2). Has been.

  This is a small electric device that cuts the object to be cut by rotating the rotary blade according to any one of the above with motors 12 and 70.

  In the present invention, the second turning surface 46 is formed between the inclined surface 46a inclined downward inwardly from the clearance edge 48 toward the lower side in the rotational direction, and between the inclined surface 46a and the edge 58 of the base surface 44. The cross-sectional area on the base surface 44 side (inner side) can be sufficiently ensured by forming the connecting concave surface 46b. As a result, the strength of the blade against the cutting reaction force acting on the blades 25 and 26 can be obtained. Moreover, the cut | disconnected cut object (beard waste etc.) can be dropped on the inclined surface 46a, and scattering of a cut object (whisker waste etc.) can be prevented. Furthermore, since it is difficult for the cut material (whisker scraps or the like) to remain on the cut surface 43, it is possible to prevent the sharpness from being lowered.

  The second turning surface 46 has an indented shape that connects the inclined surface 46a and the end surface 58 of the base surface 44 with an inclined surface 46a that inclines downward from the clearance edge 48 toward the lower side in the rotational direction. By forming an inverted letter shape with the concave surface 46b, it is possible to clearly separate cuts (such as whiskers) cut at the intersection (intersection 53) between the inclined surface 46a and the concave surface 46b. Therefore, the cut object (whisker etc.) that has crossed the intersection from the inclined surface 46a and dropped further inward is difficult to return upward, and it is possible to further prevent the cut article (whisker etc.) from scattering.

  Since a downwardly inclined surface 46a can be formed at about half of the entire thickness of the blade body 20 or above it, it is cut by each of the small blades 25 and 26 while ensuring the strength of the entire blade. It is possible to guide the cut material (whiskers and the like) that has been cut along the inclined surface 46a and reliably drop the cut material to the blade support 21 side.

  According to the small electric apparatus provided with the rotary blade according to the present invention, the rotary blade is rotated by the power of the motors 12 and 70, so that a cutting target such as a beard, a hairball, or a nail can be effectively cut.

It is the front view which shows the structure of the rotary blade which concerns on this invention, and principal part sectional drawing. It is a front view of an electric razor. It is a vertical side view in the head part of an electric razor. It is a disassembled perspective view of a rotary blade. It is a top view of a blade main body. It is a top view of the 1st blank in an etching process. It is a side view which shows the processing state of the 2nd blank in a press process. It is a longitudinal cross-sectional view which shows the process of welding of a 2nd blank. It is sectional drawing which shows the outline of an etching process. FIG. 6 is a sectional view taken along line XX in FIG. 5. It is sectional drawing which shows the structure of a welding part. It is a disassembled perspective view which shows another Example of a rotary blade. It is the front view which shows another Example of a blade support body, and a partially broken front view. It is sectional drawing equivalent to FIG. 10 which shows the modification of the cross-sectional shape of a small blade. It is a top view which shows the modification of a blade main body. It is a front view which shows another example of application of an inner blade. It is a front view which shows another example of application of an inner blade. It is a front view which shows another example of application of an inner blade. It is a front view which shows another example of application of an inner blade. It is sectional drawing which shows another processing form of a blade main body. It is the front view of the rotary blade of a 1st form, a top view, a bottom view, a right side view, a left side view, and a rear view. It is AA sectional drawing and BB sectional drawing of the rotary blade of a 1st form. It is the front view of the rotary blade of a 2nd form, a top view, a bottom view, a right side view, a left side view, and a rear view. It is AA sectional drawing and BB sectional drawing of the rotary blade of a 2nd form. It is sectional drawing which shows another Example of a rotary blade.

First Embodiment FIGS. 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 razor. 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 is provided in order to improve the decorativeness of the electric razor, and constitutes a grip in cooperation with the main body 1. On one side upper part of the outer frame 3, a switch button 4 for turning on / off the energization state of the motor 12 is provided. A secondary battery 5 and a circuit board 6 are incorporated in the main body 1. The circuit board 6 is mounted with a switch that can be switched by the previous switch button 4, an LED for the indicator lamp 7, and electronic components that constitute a control circuit and a power supply circuit.

  The head portion 2 is provided with a main blade including an outer blade 10 and an inner blade (rotating blade) 11 that rotates in one direction around the horizontal axis. Further, a motor 12 that rotationally drives the inner blade 11, and a motor A drive structure for transmitting 12 rotational power to the inner blade 11 is provided. The motor 12 is fixed to the lower surface of the head frame 15 and accommodated on the upper inner surface of the main body 1. The drive structure is composed of a group of gear trains 13, which converts the rotational power around the vertical axis of the motor 12 into rotational power around the horizontal axis and transmits it to the inner blade 11. The inner blade 11 is rotationally driven in the direction indicated by the arrow in FIG. The outer blade 10 is composed of a sheet-like mesh blade formed by an etching method or an electroforming method, and its front and rear edges are supported by the outer blade holder 14 and retained in an inverted U shape (see FIG. 3). ). FIG. 3 shows an outer blade 10 formed by electroforming. Reference numeral 17 denotes a cutting blade of the outer blade 10. The head portion 2 is supported by the main body portion 1 so as to be movable up and down, and the space between the two is sealed with a waterproof packing.

  The outer blade holder 14 is detachably attached to the head frame 15, and is locked so as not to be separated by a lock structure (not shown). When the pair of left and right lock release buttons 16 provided on the head frame 15 are pushed in at the same time, the engagement by the lock structure is released, and the outer blade holder 14 can be removed from the head frame 15 to expose the inner blade 11. . In this state, 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 is configured in a cylindrical bowl shape by three blade bodies 20, a blade support 21 that supports the blade body 20, and an inner blade shaft (rotating shaft) 22. The blade body 20 is basically formed by etching a stainless steel plate (metal plate) and further pressing it to form a cross section in a partial arc shape, the details of which will be described later. As shown in FIG. 4, the blade body 20 is formed in a rectangular shape having a long side portion 23 along the rotation center of the inner blade 11 and a short side portion 24 along the circumferential direction of the inner blade 11. The side 24 side is bent in a partial arc shape.

  As shown in FIG. 5, the face wall of the blade body 20 has a rhombus surrounded by a group of first blades (small blades) 25, a group of second blades (small blades) 26, and both blades 25, 26. A group of blade holes 27 and a peripheral frame surrounding these are formed. A peripheral frame on the long side portion 23 side is denoted by reference numeral 28, and a peripheral frame on the short side portion 24 side is denoted by reference numeral 29. When the width h1 of the peripheral frame 28 on the long side portion 23 side is 0.55 mm, the width h2 of the peripheral frame 29 on the short side portion 24 side is 0.45 mm, and the inequality (h1> = h2, preferably h1> h2 ) Can be satisfied. A group of the first blades 25 and a group of the second blades 26 are formed so as to be inclined in opposite directions with respect to the rotation center of the inner blade 11, whereby the entire blade body 20 is formed. It has an expanded metal appearance. The adjacent pitch of the first blade 25 and the second blade 26 was approximately 2.5 mm.

  The inclination angle θ1 of the first small blade 25 is inclined 13.4 degrees with respect to the rotation center of the inner blade 11, whereas the inclination angle θ2 of the second small blade 26 is based on the rotation center of the inner blade 11. The peripheral edges of the blades 25 and 26 are continuous with the peripheral frames 28 and 29, respectively. The first small blade 25 is formed continuously in a linear rib shape. The second small blades 26 are arranged to intersect with each other so that adjacent first small blades 25 are connected in a stepped manner, and all the intersecting portions of the second small blades 26 with the first small blades 25 have a three-way shape. (See FIG. 5). Incidentally, when the second blade 26 is arranged in a straight rib shape like the first blade 25, the intersection of the blades 25 and 26 has a four-way shape.

  As described above, when a group of the first small blades 25 and a group of the second small blades 26 are provided in an expanded metal shape on the sheet surface of the blade body 20, as compared with a conventional inner blade having a spiral blade as a cutting element. The total length of the cutting blades can be increased, and the cutting blades 25 and 26 having different inclination directions can be cut alternately while generating comb hairs. Furthermore, since the opening area of the blade hole 27 is significantly larger than that of a conventional inner blade having a mesh blade structure, the whisker can be cut by effectively introducing a beard similarly to the inner blade having a spiral blade as a cutting element. Can be performed effectively.

  In FIG. 4, the blade support 21 is provided with five disk-shaped blade receiving portions 31 and fuzz receiving surfaces 32 that are recessed from the peripheral surface of the blade receiving portion 31 toward the center of rotation, and the blade supports on both ends. It consists of a turning product made of stainless steel (made of metal) integrally provided with an inner blade shaft 22 protruding laterally from the center of the side surface of the portion 31. The fluff receiving surface 32 is formed as a concave curved surface obtained by rotating a partial arc around the rotation center, and the outer edge thereof is continuous with the circular peripheral edge of the blade receiving portion 31. In a state where the blade body 20 is fixed to the blade receiving portion 31 of the blade support 21, a freight receiving space 33 is formed in a circular shape between the blade main body 20 and the fuzz receiving surface 32 (see FIG. 1). . The peripheral surfaces of the blade receiving portion 31 and the inner blade shaft 22 are smoothly finished, and an inner blade gear 34 that meshes with the final gear of the gear train 13 is fixed to one end of the inner blade shaft 22 (see FIG. 2).

  As shown in FIG. 1, the diameter of the blade receiving portion 31 is D1 (9.5 mm), the minimum diameter of the fluff receiving surface 32 is D2 (5.0 mm), and the diameter of the inner blade shaft 22 is D3 (2. 0 mm), the three-way relationship is set so as to satisfy the inequality (D1> D2> D3). The width h3 (see FIG. 1) of the blade receiving portion 31 is 1.0 mm so that the relationship with the width h2 of the peripheral frame 29 can satisfy the inequality (h2 <= h3, preferably h2 <h3). is there.

  Next, the detail of the manufacturing method of the inner blade 11 is demonstrated. The inner blade 11 is formed by subjecting a stainless steel plate (metal plate), which is a raw material not subjected to heat treatment (quenching), to a punching process such as etching or punching, in this embodiment, a punching process by etching. A step of forming the first blank 37 (etching step), a step of pressing the first blank 37 to form the second blank 38 bent into a partial arc shape (pressing step), and thereafter The second blank 38 that is still in a raw material state that has not been subjected to heat treatment (quenching) is welded to the blade support 21 that is also a raw material that has not been subjected to heat treatment (quenching). Forming the third blank 39 (welding step), applying a heat treatment to the third blank 39 (heat treatment step), and grinding the third blank 39 after the heat treatment. To form through the process (grinding process) to form a cutting edge 47. Details of each step will be described below.

(Etching process)
In the etching step, the front and back surfaces of the stainless steel plate 36 having a thickness of 0.3 mm are etched to form the first blade 25, the second blade 26, and the like. Specifically, as shown in FIG. 9, a resist film 40 is formed on both front and back surfaces of the stainless steel plate 36 and then exposed, the exposed portion is removed, and the surface of the plate material surrounded by the non-exposed portion is etched with an etching solution. As shown in FIG. 6, in the etching process, a large number of first blanks 37 are simultaneously formed, and the bridging portions 49 provided on the short side portions 24 are cut and separated from the stainless steel plate 36.

  By performing the etching process, the first small blade 25 and the second small blade 26 having the cross-sectional shape shown in FIG. 10 are formed. The first small blade 25 and the second small blade 26 include an outer cut surface 43, an inner base surface 44, a first beveled surface 45 formed between the end edges of both 43 and 44, and a second bend. The surface 46 is formed into a deformed cross section having five corners. The first turning surface 45 is formed by a single indented surface that extends between the edges of the cutting surface 43 and the base surface 44, and the cutting surface 43 is rotated by the cutting surface 43 and the first turning surface 45. A cutting blade 47 is formed on the upper side in the direction. Further, the cut surface 43 and the second turning surface 46 form a relief edge 48 on the lower side in the rotational direction of the cut surface 43. The first turning surface 45 is on the upper side in the rotation direction, and the second turning surface 46 is on the lower side in the rotation direction.

  In order to make the cutting blade angle of the cutting blade 47 smaller, the formation position of the base surface 44 is largely shifted to the lower side in the rotational direction than the formation position of the cutting surface 43. In this embodiment, when assuming the phase position in the circumferential direction of the blade body 20, the phase position of the front edge 59 on the upper side in the rotational direction of the base surface 44 and the phase position of the relief edge 48 are substantially matched. The formation position of the base surface 44 is shifted to the lower side in the rotational direction with respect to the formation position of the cut surface 43. It is also possible to set the phase position of the relief edge 48 on the lower side in the rotation direction than the phase position of the front edge 59 on the upper side in the rotation direction of the base surface 44. In this way, the strength on the cutting blade 47 side (blade edge side) is improved. This embodiment will be described later. The second turning surface 46 includes an inclined surface 46a for dropping a cut product (hair dust) that is inclined inwardly from the escape edge 48 toward the lower rotation side, an inclined surface 46a, and an edge 58 of the base surface 44. With an indented concave surface 46b on the inner side in the radial direction of the rotary blade that connects between the two, a reverse character of the inclined posture (forward inclined posture) toward the upper side in the rotational direction (a character shape when viewed from the opposite direction) Is formed. Thus, by forming the 2nd bevel surface 46 with two concave curved surfaces, compared with the cross-sectional area of the cutting blade 47 side (outside) in the small blades (blade part) 25 and 26, the base surface 44 side (inner side) is compared. A sufficient cross-sectional area can be secured to improve the strength of the blade. In other words, by providing the inclined surface 46a, the minimum thickness t3 between the first beveled surface 45 and the inclined surface 46a is reduced to the minimum thickness t4 between the first beveled surface 45 and the recessed surface 46b. For example, the thickness is smaller than the thickness t4 on the base surface 44 side. Thereby, the spring property can be imparted to the cutting portion including the cutting surface 43 and the cutting blade 47 while improving the strength of the small blade. The minimum thickness t3 between the first face 45 and the inclined surface 46a is set smaller than the total thickness T, the width b1 of the cut surface 43, and the width b2 of the base surface 44. Further, a portion where the inclined surface 46a and the recessed surface 46b intersect with each other is an acute intersection 53, and an edge 58 of the base surface 44 is provided on the upper side in the rotational direction from the intersection 53. A concave surface 46b is formed so as to be connected to the end edge 58 while forming an inner concave shape from the intersection 53 toward the upper side in the rotational direction. Since the dent surface 46b is formed in an inner dent shape, it is difficult for the cut object (whisker if it is an electric razor) dropped from the intersecting portion 53 to return toward the cut surface 43 side (outward). Further, the portion where the inclined surface 46a and the recessed surface 46b intersect with each other is an acute intersection 53, and since the edge 58 of the base surface 44 is provided on the upper side in the rotational direction from the intersection 53, the intersection 53 It is even more difficult for the cut object (whisker if it is an electric razor) dropped from the side to return to the cut surface 43 side (outward).

  The first blade 25 and the second blade 26 formed as described above have a total width B of 0.6 mm and a width b1 of the cutting surface 43 when the total thickness T is 0.3 mm. Is 0.25 mm and the width b2 of the base surface 44 is 0.35 mm so that the inequality (b1 <= b2, preferably b1 <b2) is satisfied. Further, the thickness t1 of the inclined surface 46a on the cut surface 43 side is set to 0.15 mm, the thickness t2 of the lower recessed surface 46b on the base surface 44 side is set to 0.15 mm, and the gap between the first turn surface 45 and the inclined surface 46a is set. The thickness t3 was set to 0.2 mm so that the inequalities (T> t3) and (t1 <= t2, preferably t1 <t2) were satisfied. The inequality (t3 <t4) is set such that the wall thickness t3 between the first ribbed surface 45 and the inclined surface 46a is 0.2 mm, and the wall thickness t4 between the first ribbed surface 45 and the recessed surface 46b is 0.33 mm. To satisfy. In addition, the setting of the total width B and the total thickness T of the blades 25 and 26 is an inequality (T <= B, preferably T <B), and a cutting load is applied to the blades 25 and 26 when cutting the cut object. However, the long blades 25 and 26 are long in the rotational direction so that they are not easily deformed. The small blades 25 and 26 include an outer cut surface 43, an inner base surface 44, and a first and second turned surfaces 45 and 46 formed between the edges of the both 43 and 44. In the structure, the overall width B and the total thickness T of the blades 25 and 26 are set as inequalities (T <= B, preferably T <B) to prevent deformation at the time of cutting load. For example, the inclined surface 46a is not necessarily formed.

(Pressing process)
As shown in FIG. 7, in the pressing process, the first blank 37 is bent into a partial arc shape using the fixed mold 51 and the movable mold 52 to form the second blank 38. In the obtained second blank 38, as shown in FIG. 8, the radius R1 of the inner surface on the short side portion 24 side is set slightly smaller than the radius R2 of the circular peripheral surface of the blade receiving portion 31. The length of the long side part 23 corresponds to the left and right lengths of the blade receiving parts 31 at both ends. As described above, the width h2 of the peripheral frame 29 on the short side portion 24 side is set to be smaller than the width h1 of the peripheral frame 28 on the long side portion 23 side. The deformation stress of can be reduced. Therefore, the second blank 38 can be accurately formed in a partial arc shape. Further, since the soft first blank 37 that has not been heat-treated is pressed, the variation width of the shape due to the springback that is unavoidable in the heat-treated material is reduced, and the bending of the second blank 38 can be easily performed. It can be done reliably.

(Welding process)
In the welding process, as shown in FIG. 8A, the three second blanks 38 are positioned by being applied to the blade receiving portion 31 of the blade support 21 made of stainless steel (metal material). Specifically, the peripheral surfaces of the three second blanks 38 are held and elastically deformed by a partial arc-shaped jig 55 divided into three parts, and as shown in FIG. The inner surface is held in close contact with the peripheral surface of the blade receiving portion 31. In this state, the peripheral frames 28 and 29 of the second blank 38 are welded by the laser welding machine 56.

  As described above, when welding is performed in a state where the second blank 38 is in close contact with the peripheral surface of the blade receiving portion 31 against the deformation stress, the second blank 38 is affected by variations in the shape of the second blank 38 in the pressing process. Without any problem, the entire inner surface of the second blank 38 during welding can be brought into close contact with the peripheral surface of the blade receiving portion 31. Therefore, the width of the variation in roundness of the blade body 20 in the third blank 39 after welding can be reduced. In addition, the machining cost of the rotary blade can be reduced by saving labor and time required for grinding processing, which will be described later, as much as the variation in roundness is small.

  By welding with the laser welder 56, the welded portion 57 is heated to 2000 ° C. and melted for a very short time. As shown in FIG. 11A, the melted portion is the wall of the blade receiving portion 31. Reach up to within. In addition, a welded portion 57 that swells outwardly is formed on the peripheral surface of the blade body 20. At this time, a group of welded portions 57 are formed in order from the center of the long side portion 23 toward the arc side portion (short side portion) 24 as indicated by reference numerals w1 to w10 in FIG. The main body 20 can be prevented from floating away from the peripheral surface of the blade receiving portion 31 due to internal stress during welding, and the blade main body 20 can be brought into close contact with the blade receiving portion 31. Moreover, when the welding position (w1-w8) of the welding part 57 is provided on the straight side part (long side part) 23, the straight side part (long side part) of the blade main body 20 in the subsequent heat treatment process. 23 was distorted and wavy. Therefore, in this embodiment, the welding position (w5 · w6 · w9 · w10) of the welding portion 57 in the arc side portion (short side portion) 24 is used as the welding position of the welding portion 57 in the straight side portion (long side portion) 23 ( Cylindrical bowl shape that can prevent distortion of the blade body 20 during the subsequent heat treatment step by being positioned closer to the center in the width direction of the arc side part (short side part) 24 than w1 to w4, w7 to w8). The third blank 39 can be formed.

  The welding pattern in which the group of welded portions 57 are sequentially formed from the central portion of the straight side portion 23 toward the arc side portion (short side portion) 24 is not limited to the above-described welding pattern, and the following welding is performed. This can be done with pattern 2 and weld pattern 3. If the welding position code shown in FIG. 5 is referred to as (w1 to w10), in the welding pattern 2, the welded portion 57 is formed in the order of w1, w3, w5, w7, w9, w2, w4, w6, w8, and w10. Further, in the welding pattern 3, the welded portion 57 is formed in the order of w1, w3, w5, w2, w4, w6, w7, w9, w8, and w10. Since a welding pattern should be changed also by the change of the total number of the welding parts 57, welding patterns other than the welding patterns 1-3 may be employ | adopted. In short, any welding pattern that can prevent the blade body 20 from being lifted off from the peripheral surface of the blade receiving portion 31 due to internal stress during welding may be used.

(Heat treatment process)
In the heat treatment step, the cylindrical bowl-shaped third blank 39 is heated to about 1000 ° C., and after maintaining the state for a predetermined time, quenching is performed by sequentially cooling with water and heated oil. Thereby, the metal structure of the blade body 20 can be martensite to increase its hardness. In the process of heating the third blank 39, it is possible to remove the internal distortion caused by the heat generated around the welded portion 57 during laser welding.

(Grinding process)
In the grinding process, rough grinding and finish grinding are sequentially performed on the peripheral surface of the cylindrical bowl-shaped third blank 39 to improve the roundness of the peripheral surface of the blade body 20 and further sharpen the cutting edge 47. Finish. In the rough grinding process, as shown in FIG. 11B, the bulging surface of the welded portion 57 is removed, and at the same time, the peripheral surface of the blade body 20 is ground. Further, in the finish grinding process, finish grinding is performed so that the surface roughness of the peripheral surface of the blade body 20 is reduced, and the diameter dimension, roundness, and surface roughness of the outer peripheral surface of the inner blade 11 are in a predetermined state. Finish. As described above, when the bulging surface of the welded portion 57 that is easily corroded is removed, the corrosion of the welded portion 57, cracks, and the like can be eliminated, and the durability of the blade can be improved. If the required specification for the roundness of the inner cutter 11 is low, the grinding step can be omitted.

  In this way, by performing heat treatment (quenching) after press working, the first blank 37 in a soft state that has not been heat treated can be pressed, so that the second blank 38 can be processed easily and accurately. Further, the hardness is obtained by applying heat treatment to the third blank 39 in which the second blank that has not been heat-treated (quenched) and the blade support 21 that has not been heat-treated are integrated by welding. It is possible to prevent stress corrosion and cracking of the welded part while enhancing the strength of the blade and improve the durability of the blade.

  An inner blade 11 obtained through a series of manufacturing steps is shown in FIG. The inner blade 11 includes a blade body 20 having a group of small blades 25 and 26 and a blade support 21 and has a cylindrical bowl shape as a whole. Thus, when the inner blade 11 is configured in a cylindrical bowl shape, the overall structure of the inner blade 11 can be simplified and its manufacturing cost can be reduced as compared with a conventional inner blade having dozens of spiral blades as cutting elements. . Further, since a group of the rib-shaped first and second blades 25 and 26 is used as a cutting element, the cutting blade 47 is formed around the blades 25 and 26 while increasing the total length. The whiskers can be efficiently cut by effectively introducing the whiskers into the blade hole 27. Similar to a conventional inner blade that uses a spiral blade as a cutting element, there is an advantage that the whiskers can be sharply cut.

  Since the double-sided fluff receiving surface 32 is provided between the adjacent blade receiving portions 31 and the circular fluff receiving space 33 is formed inside the blade body 20, the inner corner portion where the fluff easily accumulates. Can be prevented from being formed in the fuzz receiving space 33. In addition, the fluff adhering to the fluff receiving surface 32 can be guided to the large diameter edge side of the fluff receiving surface 32 and discharged from the blade hole 27 facing the large diameter edge. It is possible to prevent the generated fluff from accumulating inside the inner blade 11.

  In particular, at the time of washing with water, the washing water can be introduced without resistance from the blade hole 27 having a large opening area, and the chips that have entered the blade body 20 can be washed out together with the washing water. Accordingly, it is possible to eliminate the remaining of the fluff on the fluff receiving surface 32 and the inner surface of the blade body 20 and maintain the inside of the inner blade 11 in a sanitary state. Further, in the fluff receiving space 33 at both ends, the width h2 of the peripheral frame 29 on the side of the arc side (short side) 24 is made smaller than the width h3 of the blade receiving portion 31, so that the fluff receiving surface 32 is reversed. It is possible to prevent the washed water from being received by the inner edge of the peripheral frame 29 and to surely wash away the hair chips together with the washing water. When the washing water flows into the fluff receiving space 33, the peripheral frame 29 on the arc side (short side) 24 side does not get in the way.

  The blade receiving portion 31 is supported by the hyperboloid fuzz receiving surface 32, and the entire blade support 21 is solid. Therefore, the structural strength of the blade support 21 can be improved, and a large rotational inertia can be obtained when cutting the beard. It is possible to suppress the rotational fluctuation of the inner blade 11 accompanying the fluctuation of the load by exerting the force. Moreover, since the both side end surfaces of the blade body 20 fixed to the blade support 21 are arranged flush with the side end surfaces of the blade receivers 31 located at the both side ends of the blade support 21, the side end surfaces of the blade receivers 31 are provided. It is possible to eliminate the accumulation of debris on the surface. For example, when the side end surface of the blade receiving portion 31 protrudes outward from the side end surface of the blade receiving portion 31, fuzz is formed on the inner corner formed by the protruding edge and the side end surface of the blade receiving portion 31. It is unavoidable to deposit, but this situation can be avoided.

  That is, the embodiment is a cylindrical bowl-shaped rotary blade including a blade body 20 whose section is bent in an arc shape, a blade support 21 that supports the blade body 20, and a rotary shaft 22. The main body 20 is provided with rib-shaped small blades 25 and 26 and blade holes 27 formed between the small blades 25 and 26, and a blade that receives the blade main body 20 on the peripheral surface of the blade support 21. The receiving part 31 and the receiving surface 32 of the cut | disconnected thing (hair dust) dented to the rotation center side from the surrounding surface of the blade receiving part 31 are provided alternately, and the blade main body 20 fixed to the blade support body 21 and a receiving surface The rotary blade is characterized in that a receiving space 33 is formed in a circular shape between the receiving space 33 and the rotary blade. As an effect thereof, the blade main body 20 provided with the small blades 25 and 26 and the blade support 21 form the rotary blade 11 in a cylindrical bowl shape as a whole. Compared with the inner blade, the entire structure of the rotary blade 11 can be simplified and the manufacturing cost can be reduced. Further, the blade support 21 is provided with blade receiving portions 31 and receiving surfaces 32 that are recessed from the blade receiving portion 31 toward the center of rotation, and the blade receiving portions 31 to which the blade body 20 is fixed are supported by the receiving surfaces 32. Therefore, the strength of the blade support 21 can be improved while increasing the structural strength of the blade receiver 31. Further, by providing the receiving surface 32 that is recessed toward the rotation center side, a circular receiving space 33 is formed between the blade body 20 and the receiving surface 32, so that the cut fuzz is cut off by the small blades 25 and 26. Adhering to or accumulating in the vicinity of the blade 47 can be reliably prevented.

  In another embodiment, the receiving surface 32 is a concave curved surface, and the outer edge of the receiving surface 32 is a rotary blade that is continuous with the circular peripheral edge of the circular blade receiving portion 31. As a result, when the receiving surface 32 is formed as a concave curved surface and the outer edge thereof is continuous with the circular peripheral edge of the blade receiving portion 31, the inner corner portion where fouls are liable to accumulate is cleared from the receiving space 33. The accumulation of fouling on the inner surface of the blade body 20 and the peripheral surface of the receiving surface 32 can be eliminated. In addition, since the fluff adhering to the receiving surface 32 can be guided to the large-diameter edge side of the fluff-receiving surface 32 and discharged from the blade hole 27 facing the large-diameter edge, it is cut while being the rotary blade 11 having the ridge structure. It is possible to prevent the fluff from accumulating inside the rotary blade 11. In particular, when the rotary blade 11 can be washed with water, the waste can be washed away with the wash water introduced from the blade hole 27, so that the inside of the cylindrical bowl-shaped rotary blade 11 can be effectively cleaned. Can do. Further, when the diameter of the blade receiving portion 31 is D1, the minimum diameter of the fluff receiving surface 32 is D2, and the diameter of the rotating shaft 22 is D3, the three of the blade receiving portion 31, the receiving surface 32 and the rotating shaft 22 are The rotary blade is configured to satisfy the inequality D1> D2> D3. Thereby, if the relative dimensions of the three of the blade receiving portion 31, the receiving surface 32, and the rotating shaft 22 are configured so as to satisfy the inequality D1> D2> D3, the overall strength of the blade support 21 is sufficient. The rotational inertial force when the rotary blade 11 is driven can be increased while securing the rotation. In particular, when the blade support 21 is made of a metal material, the rotational inertia force of the rotary blade 11 can be increased, and therefore, the rotational fluctuation of the rotary blade 11 due to the fluctuation of the cutting load in the use state is suppressed. Thus, the cutting operation can be facilitated. Moreover, since the peripheral speed in the receiving surface 32 with a large diameter D2 compared with the rotating shaft 22 can be increased, it can discharge | emit out of the rotary blade 11, shaking off the dust adhering to the receiving surface 32 effectively.

  Further, the rotary blade is a rotary blade in which the width h <b> 2 of the peripheral frame 29 positioned at both side ends of the blade body 20 is set smaller than the width h <b> 3 of the blade receiving portion 31 positioned at both side ends of the blade support 21. Accordingly, when the width h2 of the peripheral frame 29 positioned at both ends of the blade body 20 is set to be smaller than the width h3 of the blade receiving portion 31 positioned at both ends of the blade support 21, cleaning of the rotary blade 11 with water can be easily performed. Moreover, it can be done quickly. This is because the washing water flowing in from the blade hole 27 is reversed by the receiving surface 32 and then received by the inner edge of the peripheral frame 29, so that the hair can be washed away together with the washing water. When the washing water flows into the receiving space 33, the peripheral frame 29 on the short side portion 24 side does not get in the way. Further, the blade body 20 is a rotary blade in which both side end surfaces are flush with the side end surfaces of the blade receiving portions 31 located at both side ends of the blade support 21. As a result, when both side end surfaces of the blade body 20 are flush with the side end surfaces of the blade receiving portions 31 located at the both end portions of the blade support 21, inner corners on which side chips of the blade receiving portions 31 are likely to accumulate. By avoiding the formation of the portion, it is possible to eliminate the accumulation of fouling at the side end of the blade support 21.

  Further, the blade body 20 is formed in a rectangular shape having a long side portion 23 along the rotation center of the rotary blade 11 and a short side portion 24 along the circumferential direction of the rotary blade 11, and the short side portion 24 side. This is a rotary blade in which the width h2 of the peripheral frame 29 is set smaller than the width h1 of the peripheral frame 28 on the long side portion 23 side. Thereby, when the blade body 20 is formed in a rectangular shape and the width h2 of the peripheral frame 29 on the short side portion 24 side along the circumferential direction is set smaller than the width h1 of the peripheral frame 28 on the long side portion 23 side, the press The deformation stress of the peripheral frame 29 when processing can be reduced. Therefore, the bending process of the blade body 20 formed in an arc shape can be performed easily and accurately. The blade body 20 is provided with a first small blade 25 that is inclined with respect to the rotation center of the rotary blade 11, and a second small blade 26 that intersects the first small blade 25. The rotary blade is inclined in the direction opposite to the first small blade 25 with respect to the rotation center and can simultaneously exhibit the reinforcing function and the whisker cutting function of the first small blade 25. Accordingly, when the first small blade 25 inclined to the blade body 20 and the second small blade 26 inclined opposite to the first small blade 25 are provided, the total length of the cutting blade 47 is further increased. Thus, the beard and the hairball can be efficiently cut by the two small blades 25 and 26. Further, by arranging the second small blade 26 so as to intersect the first small blade 25, the first small blade 25 can be reinforced by the second small blade 26 to improve the structural strength of the blade body 20, and the cutting efficiency as a whole can be improved. The rotary blade 11 having a high and sturdy blade body 20 is obtained.

  Furthermore, the inclination angle θ1 with respect to the rotation center of the first blade 25 is different from the inclination angle θ2 with respect to the rotation center of the second blade 26, and the second blade 26 is arranged in a linear rib shape. This is a rotary blade that is arranged so as to intersect with the small blade 25 in a state where the intersection with the first small blade 25 has a three-way shape. As a result, when the inclination angle θ1 of the first blade 25 and the inclination angle θ2 of the second blade 26 are made different, each blade 25 and 26 captures whiskers and hairs facing in different directions. Can be cut. For example, a beard or hair that could not be captured by the first blade 25 can be captured by the second blade 26 and cut. Further, by arranging the second blades 26 so as to intersect with the first blades 25 in a state where the intersections with the first blades 25 form a three-way shape, the adjacent intervals in the circumferential direction of the blades 25 and 26, 26 The degree of appearance can be changed variously. Therefore, the beard and hair can be accurately captured by the two small blades 25 and 26 and cut effectively.

  The etching process described above can be changed to a pressing process. That is, as shown in FIGS. 20A to 20C, a punching process is performed by punching a stainless steel plate (metal plate) 82, which is a raw material that has not been subjected to heat treatment (quenching). A blank 83 is formed as shown in FIG. The blank 83 is formed with a blade hole 27 and a front body 84 of the small blade 25 having a square cross section. Next, the blank 83 is subjected to plastic working, and as shown in FIG. 20 (c), the front body 84 is divided into an outer cut surface 43, an inner non-cut surface 44, and the edges of both 43 and 44. A small blade 25 having an acute angle cutting edge 47 and a relief edge 48 is formed by forming a cup shape in cross section by the first and second surface 45 and 46 formed therebetween. Thereby, the 1st blank 37 provided with the some small blade 25 is obtained. Next, as shown in FIG. 20 (d), the first blank 37 is pressed, and the second blank 38, which is plastically deformed into an outwardly curved shape (circular arc shape with the same circumferential curvature), is formed. Form. The width center of the non-cut surface 44 is offset from the width center of the cut surface 43 by the dimension L toward the second turned surface 46. That is, since the center of the width of the non-cutting surface 44 is shifted from the center of the width of the cutting surface 43 to the lower side in the rotation direction, the cutting edge angle θ1 of the cutting edge 47 is formed smaller than the edge angle θ2 of the relief edge 48. Sharpness can be sharpened. Hereinafter, in the same manner as described above, the second blank 38 in a raw material state that has not been subjected to heat treatment (quenching) after that, the blade support that is also a raw material that has not been subjected to heat treatment (quenching). 21, forming a third blank 39 to be the inner blade 11 (welding step), applying a heat treatment to the third blank 39 (heat treatment step), and applying the heat-treated third blank 39 to the third blank 39 It forms through the process (grinding process) which forms the cutting blade 47 by grinding. Although the dimensions are not shown, also in this embodiment, the setting of the full width B and the full thickness T of the blades 25 and 26 is set to an inequality (T <= B, preferably T <B).

  Also in the embodiment of this pressing step, as in the etching step, a large number of first blanks 37 are formed at the same time, and the bridging portion 49 provided on the short side portion is cut, and the stainless steel plate material is used. Can be separated.

The inner blade (rotating blade) 11 provided with the first small blade 25 and the second small blade 26 having a cross-sectional shape shown in FIG. 10 can be implemented in the following form.
The rotary blade 11 is configured in a cylindrical bowl shape by a blade body 20 whose cross section is bent in an arc shape and a blade support 21 that supports the blade body 20. The blade body 20 is provided with a group of rib-shaped small blades (blade portions) 25 and 26 and a group of blade holes 27 by drilling by etching or punching. The small blades 25, 26 have an outer cut surface 43, an inner base surface 44, first and second turned surfaces 45, 46 formed between them 43, 44, and rotation of the cut surface 43. A cutting edge 47 formed on the upper side in the direction and a relief edge 48 formed on the lower side in the rotation direction of the cutting surface 43 are provided. The cutting edge 47 is formed at an acute angle, and the relief edge 48 is formed at an obtuse angle. The base surface 44 is arranged on the lower side in the rotational direction than the cutting surface 43 so that the cutting edge angle of the cutting edge 47 is further sharpened. Further, the width b1 of the cut surface 43 is set to be equal to or smaller than the width b2 of the base surface 44. The first turning surface 45 is formed by one inner recessed surface that is recessed from the cutting edge 47 toward the lower side in the rotational direction. The second turning surface 46 includes an inclined surface 46a for dropping a cut product (hair dust) that is inclined inwardly from the escape edge 48 toward the lower rotation side, an inclined surface 46a, and an edge 58 of the base surface 44. Similarly, the concave surface 46b having an inner concave shape that connects the two is formed in a reverse letter shape (a square shape when viewed from the opposite direction) in an inclined posture (forward inclined posture) toward the upper side in the rotational direction. By forming the inclined surface 46a that is inclined downward in this inner dent shape, the relief edge 48 has an obtuse angle. Furthermore, the position of the relief edge 48 of the cut surface 43 is set to be substantially the same as the position of the front edge 59 of the base surface 44. A portion where the inclined surface 46a and the recessed surface 46b intersect with each other is an acute-angled intersection 53, and an edge 58 of the base surface 44 is provided on the upper side in the rotational direction from the intersection 53. The cut surface can be dropped onto the inclined surface 46a by the inclined surface 46a, and scattering of the cut material can be prevented. Furthermore, since it is difficult for the cut material (whisker scraps) to remain on the cut surface 43, it is possible to prevent the sharpness from being lowered. The second turning surface 46 has an indented shape that connects the inclined surface 46a and the end surface 58 of the base surface 44 with an inclined surface 46a that inclines downward from the clearance edge 48 toward the lower side in the rotational direction. By forming an inverted letter shape with the recessed surface 46b, it is possible to clearly separate the cut objects cut at the intersection (intersection portion 53) between the inclined surface 46a and the recessed surface 46b. The cut object that has crossed the intersection from the surface 46a and has fallen further inward is unlikely to return upward (outward), and the scattering of the cut object can be further prevented.

  For example, if the cross-sectional area on the blade edge side (outer side) and the cross-sectional area on the inner side away from the blade edge are substantially the same as in the prior art, the strength on the blade edge side (outer side) and the inner strength on the blade portion are substantially the same. If the cross-sectional area of the entire blade portion is reduced in order to reduce the sliding resistance of the cutting surface, the strength of the inner portion is weakened accordingly, and the overall inertial force is also weakened, thereby affecting the cutting performance. Therefore, according to the rotary blade 11 described above, the cutting edge angle of the cutting edge 47 can be sharpened, and the cross-sectional area of the base surface 44 side (inner side) portion of the small blades 25 and 26 can be increased or maintained. The width b1 of the cut surface 43 is set to be equal to or smaller than the width b2 of the base surface 44 while increasing or maintaining the mechanical strength of the base surface 44 side (inner side) portion in 25 and 26. Since the sliding contact resistance of the two small blades 25 and 26 with respect to the outer blade 10 is reduced, the friction of the rotating blade 11 at the time of rotational driving can be reduced and the driving efficiency can be improved. That is, for example, in the case of the rotary inner blade 11 that slides on the outer blade 10 as in this embodiment, the sliding area with the outer blade 10 is reduced, and the motor 12 that rotationally drives the inner blade 11 is used. The load can be reduced. Alternatively, power is not consumed excessively due to the sliding resistance, and the capacity of the secondary battery 5 that supplies power to the motor 12 can be prevented from being reduced early. Furthermore, since the mass of the inner part in the small blades 25 and 26 can be increased or maintained, an extreme decrease in inertial force can be prevented as much as possible. Further, the second turning surface 46 is formed in an inverted shape by the inclined surface 46a and the recessed surface 46b, and the cutting edge angle of the cutting edge 47 is secured while ensuring a sufficient cross-sectional area on the base surface 44 side (inner side). Since the sharpness is sharpened, it is possible to obtain the strength of the blade against the cutting reaction force acting on both the first and second blades 25 and 26, although the sharpness can be exhibited. Moreover, by forming the second turned surface 46 in an inverted shape, the thickness t3 between the inner recessed surface forming the first turned surface 45 and the inclined surface 46a is made larger than the thickness t4 on the base surface 44 side. Since it is made small, spring property can be imparted to the cutting portion including the cutting surface 43 and the cutting blade 47. That is, it is possible to obtain the rotary blade (inner blade) 11 including the small blades 25 and 26 that can exhibit supple elasticity despite having sufficient small blade strength. Moreover, since the concave surface 46b is formed in an inner concave shape, a cut object (shaver if an electric shaver) dropped from the intersecting portion 53 is difficult to return toward the cut surface 43 side (outward). Further, the portion where the inclined surface 46a and the recessed surface 46b intersect with each other is an acute intersection 53, and since the edge 58 of the base surface 44 is provided on the upper side in the rotational direction from the intersection 53, the intersection 53 It is even more difficult for the cut object (whisker if it is an electric razor) dropped from the side to return to the cut surface 43 side (outward).

  When the thickness of the inclined surface 46a in the second turning surface 46 is t1, and the thickness of the recessed surface 46b is t2, the inclined surface 46a and the recessed surface 46b satisfy the inequality (t1 <= t2, preferably t1 <t2). To form. The inclined surface 46a is inclined downwardly in an indented shape from the escape edge 48 toward the lower rotation side.

  Since a downwardly inclined surface 46a can be formed at about half of the entire thickness of the blade body 20 or above it, it is cut by each of the small blades 25 and 26 while ensuring the strength of the entire blade. It is possible to guide the cut material (hair dust and the like) that has been cut along the inclined surface 46a and to reliably drop the blade to the blade support 21 side.

  FIG. 12 shows another embodiment of the rotary blade 11 according to the present invention. In FIG. 12A, the rotary blade 11 is configured in a cylindrical bowl shape by two blade main bodies 20 bent in a semicircular shape and a blade support 21. In FIG. 12B, the rotary blade 11 is configured by a single blade body 20 and a blade support 21 in a cylindrical bowl shape. In any case, the rotary blade 11 can be formed through the same processing steps as those of the inner blade described above, using a stainless steel plate material. However, the blade body 20 shown in FIG. 12B forms the second blank 38 by forming the etched first blank 37 into a cylindrical shape with a roll forming machine. 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.

  The blade support 21 can be configured as shown in FIGS. The blade support 21 shown in FIG. 13A is formed in a trapezoidal shape with a fuzz receiving surface 32 having a round shaft portion 60 and a tapered portion 61 whose diameter increases from the round shaft portion 60 toward the blade receiving portion 31. .

  In FIG. 13 (b), the entire blade support 21 is formed by injection molding of a plastic material, and a metal inner blade shaft 22 having an anti-rotation projection 63 formed on the shaft peripheral surface at the central portion thereof. The insert was fixed. The blade body 20 in this case is fixed to the blade receiving portion 31 by adhesion or by heat welding. The blade support 21 can be formed of a plastic material having a large specific gravity and containing a large amount of metal filler. In that case, like the metal blade support 21, a large rotational inertia force can be exerted.

  In FIG. 13C, the blade support 21 is composed of five stainless steel support blocks 65, and the inner blade shaft 22 is inserted and fixed to each support block 65. Each support block 65 is provided with a blade receiving portion 31, and a hyperboloid fuzz receiving surface 32 is formed by the adjacent support block 65. The support blocks 65 at both ends form the fluff receiving surface 32 only on one side of the blade receiving portion 31, whereas the support block 65 positioned between the support blocks 65 on both sides of the blade receiving portion 31. Is formed.

  In FIG. 13 (d), the disk-shaped blade receiving portions 31 and the round cylindrical tubular shaft body 66 are alternately arranged adjacent to each other, and the inner blade shaft 22 is inserted and fixed to the blade receiving portion 31 and the tubular shaft body 66. The blade support 21 was configured. The cylindrical shaft body 66 is formed of a plastic material having a large specific gravity and containing a large amount of metal filler. In this case, the fluff receiving surface 32 has a U-shaped outer shape.

  FIG. 14 shows a modification of the cross-sectional shapes of the first blade 25 and the second blade 26 according to the present invention. In this case, the formation position of the base surface 44 is shifted to the lower side in the rotational direction with respect to the formation position of the cut surface 43. Further, the second turning surface 46 includes an inclined surface 46 a for dropping a cut product (hair dust) that inclines downward from the escape edge 48 toward the lower side of the rotation, and edges of the inclined surface 46 a and the base surface 44. 58 with the concave shape 46b on the inner side in the radial direction of the rotary blade that connects with the 58, the reverse shape of the inclined posture (forward inclined posture) toward the upper side in the rotational direction (when viewed from the opposite direction) Shape). A concave surface 46b is formed so as to be connected to the end edge 58 while forming an inner concave shape from the intersection 53 toward the upper side in the rotational direction. Furthermore, the position of the relief edge 48 of the cut surface 43 is positioned on the lower side in the rotational direction than the front edge 59 of the base surface 44. As described above, since the phase position of the relief edge 48 is set on the lower side in the rotational direction from the phase position of the front edge 59 on the upper side in the rotational direction of the base surface 44, the strength on the cutting edge 47 side (the cutting edge side) is increased. Compared to one embodiment. Further, the thickness t2 of the lower concave surface 46b was set to 0.2 mm, and the thickness t1 of the inclined surface 46a was set to 0.1 mm so that the inequality (t1 <= t2, preferably t1 <t2) was satisfied. When the total thickness T is 0.3 mm, the wall thickness t3 between the first ribbed surface 45 and the inclined surface 46a is set to 0.25 mm so that the inequality (T> t3) is satisfied. With the change of the cross-sectional shape and the position of the relief edge 48, the total width B of both the small blades 25 and 26 becomes 0.55 mm, the width b1 of the cut surface 43 at that time is 0.35 mm, and the width b2 of the base surface 44 is The inequality (b1 <= b2, preferably b1 <b2) was satisfied as 0.35 mm. An inequality (t3 <t4) is set such that the wall thickness t3 between the first ribbed surface 45 and the inclined surface 46a is 0.25 mm and the wall thickness t4 between the first ribbed surface 45 and the recessed surface 46b is 0.34 mm. To satisfy. In addition, the setting of the total width B and the total thickness T of the blades 25 and 26 is an inequality (T <= B, preferably T <B), and a cutting load is applied to the blades 25 and 26 when cutting the cut object. However, the long blades 25 and 26 are long in the rotational direction so that they are not easily deformed. In addition, in this embodiment, since the inequality (t1 <t2) is satisfied, the overall strength of the rib-shaped blades (blade portions) 25 and 26 is improved as compared with the first embodiment.

  Also in this embodiment, the mass of the portion (inner side) of the small blades 25 and 26 on the base surface 44 side can be increased or maintained, so that an extreme decrease in inertia force can be prevented as much as possible. Further, the second turning surface 46 is formed in an inverted shape by the inclined surface 46a and the recessed surface 46b, and the cutting edge angle of the cutting edge 47 is secured while ensuring a sufficient cross-sectional area on the base surface 44 side (inner side). Since the sharpness is sharpened, the strength of the blade against the cutting reaction force acting on both the first and second blades 25 and 26 can be improved, although the sharpness can be exhibited. Further, since the recessed surface 46b is formed in an inner recessed shape, the cut object (shaver if an electric shaver) dropped from the tip of the intersecting portion 53 is difficult to return toward the cut surface 43 side (outward). Further, the portion where the inclined surface 46a and the recessed surface 46b intersect with each other is an acute intersection 53, and since the edge 58 of the base surface 44 is provided on the upper side in the rotational direction from the intersection 53, the intersection 53 It is even more difficult for the cut object (whisker if it is an electric razor) dropped from the side to return to the cut surface 43 side (outward).

  FIG. 15 shows a modification of the blade body 20 according to the present invention. In this case, the second cutting edge 26 is omitted, and the cutting target is cut only by the straight rib-shaped first cutting edge 25.

  FIG. 16 shows another embodiment of an electric razor. In this case, a guard body 67 for restricting the amount of biting of the rotary blade 11 is provided around the rotary blade 11, and both of these 11 and 67 are rotationally driven by motor power. The guard body 67 is formed in the shape of a coil spring, the coil portion is wound around the peripheral surface of the rotary blade 11, and both ends thereof are fixed to the rotary blade 11. Thus, the rotary blade 11 of the present invention can also be applied to an electric razor that does not include an outer blade. In the case of this embodiment, the cross-sectional area of the base surface 44 side (inner side) portion of the small blades 25 and 26 can be increased or maintained, that is, the mechanical strength of the base surface 44 side (inner side) portion of the small blades 25 and 26 can be increased. While increasing or maintaining, the width of the cutting surface 43 in the rotation direction is set small, and the sliding contact area with the skin of the small blades 25 and 26 is reduced. The load of the motor that drives the blade 11 can be reduced.

  FIG. 17 thru | or 19 shows the Example which applied the rotary blade 11 to small electric devices other than an electric shaver. FIG. 17 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. In the case of cutting the nail, the rotary blade 11 that is rotationally driven is pressed against the tip of the nail, and the nail is scraped off little by little.

  FIG. 18 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 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. 19 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 machine body central axis of the main body portion 68 is disposed therein. The rotary blade 11 is driven to rotate by the motor 70 accommodated in the part 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. Thus, the rotary blade 11 of the present invention can also be applied to small electric devices other than electric razors.

  Other than the above embodiment, the first blade 25 and the second blade 26 do not need to be formed in a straight line, and can be formed in a meandering shape or a lightning bolt shape. When the inner blade 11 is composed of a plurality of blade main bodies 20 and blade supports 21, the circumferential lengths of the respective blade main bodies 20 are not necessarily the same. The fluff receiving surface 32 can be formed as a hyperboloid formed by rotating a parabola around the rotation center.

  Here, the external appearance (design) of the rotary blade (inner blade) for an electric razor is illustrated. 21 to 22 show the first embodiment of the rotary blade, FIG. 21 (a) is a front view, FIG. 21 (b) is a plan view, FIG. 21 (c) is a bottom view, and FIG. 21 (d). Is a right side view, FIG. 21 (e) is a left side view, and FIG. 21 (f) is a rear view. FIG. 22A is a cross-sectional view taken along line AA in FIG. 21A, and FIG. 22B is a cross-sectional view taken along line BB in FIG. 23 to 24 show a rotary blade of the second form, in which FIG. 23 (a) is a front view, FIG. 23 (b) is a plan view, FIG. 23 (c) is a bottom view, and FIG. d) is a right side view, FIG. 23 (e) is a left side view, and FIG. 23 (f) is a rear view. FIG. 24A is a cross-sectional view taken along the line AA in FIG. 23A, and FIG. 22B is a cross-sectional view taken along the line BB in FIG. The rotary blade 11 is configured in a cylindrical bowl shape with three blade main bodies 20, a blade support 21 that supports the blade main body 20, and a rotary shaft 22. The blade body 20 includes a group of first blades 25 and a group of second blades 26, which are formed so as to be inclined in opposite directions with respect to the rotation center of the rotary blade 11, respectively. Therefore, the entire blade body 20 has an expanded metal appearance. The rotary blade of the first form is similar to the rotary blade of the second form.

The rotary blade 11 shown in FIG. 24 is the same as the manufacturing method and structure of the first embodiment, except that the small blades 25 and 26 do not have the inclined surface 46a, that is, the number of the second face 46 is one. Is different. Therefore, since the manufacturing method, structure, applied small electric device, and electric razor of the rotating blade 11 of the first embodiment are basically the same, the entire structure of the rotating blade 11 and the applied small electric device, electric razor Description is omitted.
The rotary blade 11 provided with the small blades 25 and 26 having a cross-sectional shape shown in FIG. 24 can be implemented in the following form.
The rotary blade 11 is configured in a cylindrical bowl shape by a blade body 20 whose cross section is bent in an arc shape and a blade support 21 that supports the blade body 20. The blade body 20 includes a group of rib-shaped small blades (blade portions) 25 and 26 and a group of blade holes 27 by etching or punching by punching as shown in FIG. The small blades 25, 26 have an outer cut surface 43, an inner base surface 44, first and second turned surfaces 45, 46 formed between them 43, 44, and rotation of the cut surface 43. A cutting edge 47 formed on the upper side in the direction and a relief edge 48 formed on the lower side in the rotation direction of the cutting surface 43 are provided. The cutting edge 47 is formed at an acute angle, and the relief edge 48 is formed at a larger angle. The base surface 44 is shifted from the cutting surface 43 by a dimension L toward the lower side in the rotational direction, and the cutting edge angle of the cutting edge 47 is sharpened. The first turning surface 45 is formed by one inner recessed surface that is recessed from the cutting edge 47 toward the lower side in the rotational direction. With this concave surface, the cutting edge 47 is formed at an acute angle, and a sharp sharpness can be exhibited. The second turning surface 46 is formed by one inner recessed surface that is recessed from the clearance edge 48 toward the upper side of the rotation. Since the end edge 58 of the base surface 44 protrudes to the lower side in the rotational direction than the clearance edge 48 of the cutting surface 43, the cut object (whisker if an electric shaver) moves from the inside of the rotary blade 11 to the outside. It can be well prevented from popping out. On the other hand, since the cutting edge 47 of the cutting surface 43 protrudes to the upper side in the rotational direction from the front edge 59 of the base surface 44, the cutting edge 47 is further formed at an acute angle and can exhibit a sharp sharpness. . That is, the width of the full width B can be gained and the scattering of the cut object can be effectively prevented. Moreover, since there is no change in the width of the cut surface 43 in the rotational direction, whiskers can be introduced effectively. In addition, the setting of the total width B and the total thickness T of the blades 25 and 26 is an inequality (T <= B, preferably T <B). However, the long blades 25 and 26 are long in the rotational direction so that they are not easily deformed. The relief edge 48 is located between the front edge 59 and the end edge 58 of the base surface 44. Moreover, if this rotary blade is applied to the electric razor of the first embodiment, the rotary razor is driven to rotate by the motor 12 and the electric razor is cut. In the present embodiment, a concave portion can be formed by half etching in the center of the cut surface 43 to reduce the sliding resistance with the outer blade or the skin. Alternatively, the inclined surface 46a can be formed as in the first embodiment.

10 Outer blade 11 Inner blade (Rotating blade)
20 Blade body 21 Blade support 22 Inner blade axis (rotary axis)
23 Straight side (long side)
24 Arc side (short side)
25 First blade (small blade)
26 Second blade (small blade)
27 Blade hole 28 Peripheral frame on the long side portion 29 Peripheral frame on the short side portion 31 Blade receiving portion 32 Receiving surface 33 Receiving space 43 Cutting surface 44 Base surface 45 First surface 46 46 Second surface 46a Inclined surface 46b Recess Surface 47 Cutting edge 48 Relief edge

Claims (4)

A rotary blade comprising a blade body (20) bent in an arc shape, a blade support (21) supporting the blade body (20), and a rotation shaft (22),
The blade body (20) includes rib-shaped blades (25, 26),
The small blades (25, 26) include an outer cut surface (43), an inner base surface (44), and a first bend surface (45) and a second surface formed between the two (43, 44). It has a turning surface (46), a cutting edge (47) formed on the upper side in the rotational direction of the cutting surface (43), and a relief edge (48) formed on the lower side in the rotational direction of the cutting surface (43). And
The first surface (45) is formed of an inner recessed surface that is recessed from the cutting edge (47) toward the lower side in the rotational direction,
The second flanged surface (46) includes an inclined surface (46a) inclined downward inward from the escape edge (48) toward the lower side in the rotational direction, and edges of the inclined surface (46a) and the base surface (44). (58) and the concave surface (46b) which connects between, The rotary blade characterized by the above-mentioned.   The second flanged surface (46) includes an inclined surface (46a) inclined downward inward from the escape edge (48) toward the lower side in the rotational direction, and edges of the inclined surface (46a) and the base surface (44). The rotary blade according to claim 1, wherein the rotary blade is formed in a reverse letter shape with an indented concave surface (46 b) connecting between the inner and outer surfaces (58).   When the thickness of the inclined surface (46a) in the second surface (46) is t1, and the thickness of the inner recessed surface (46b) is t2, the inclined surface (46a) and the recessed surface (46b) are inequalities (t1 <= The rotary blade according to claim 1 or 2, wherein the rotary blade is formed so as to satisfy t2).   A small electric device for cutting the object to be cut by rotating the rotary blade according to any one of claims 1 to 3 with a motor (12, 70).

Images