JP2012024415A - Rotary blade and compact electric appliance including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary blade having a simple structure as compared to a rotary blade using a spiral blade as a cutting element to reduce production cost, and effectively cutting a cut target such as a whisker.SOLUTION: This rotary blade 11 is configured in a cylindrical basket shape by a blade body 20 wherein a cross-section is bent in a circular arc shape and a blade support body 21 supporting the blade body 20. The blade body 20 is provided with a group of rib-like small blades 25, 26 and a group of blade holes 27 surrounded by the group of the small blades 25, 26. The peripheral face of the blade support body 21 is alternately provided with: circular blade reception parts 31 receiving the blade body 20; and hyperboloidal clipped whisker reception faces 32 each caving to the rotation center side from the peripheral face of the blade reception part 31. Clipped whisker reception spaces 33 are circumferentially formed between the blade body 20 fixed to the blade support body 21 and the clipped whisker reception faces 32.

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.

  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.

  In addition, regarding the structure of this type of inner blade (rotating blade), a pair of left and right discs fixed to the spindle, two disc cutting blades supported by the disc so as to be movable in the radial direction, and the cutting blade as an outer cutter 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)

  According to the inner blade of Patent Document 1, it is possible to exhibit a sharp sharpness by cutting the whiskers with a cutting blade that is inclined obliquely with respect to the rotation center of the inner blade. However, since the spiral blade is supported by the solid inner blade support shaft, the chips are likely 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. The entire structure of the inner blade is complicated, and there is a disadvantage that the manufacturing cost is high.

  In that respect, the structure of the inner blade (rotary blade) of Patent Document 2 can be simplified compared to the inner blade of Patent Document 1 that uses a spiral blade as a cutting element. However, since the inner blade body is composed of a thin electroformed sheet and the inner blade body is wound and fixed around the peripheral surface of the inner blade support shaft, the inner blade body is easy to float away from the inner blade support shaft by its own elasticity. Therefore, it is difficult to ensure the roundness of the inner blade. In addition, the escape location of the fluff cut by the blade portion is limited to only a small hole formed in the thin wall portion between the blade portions, and the fluff easily accumulates on the surface of the inner blade body in a short time. Cleaning is necessary frequently.

  Since the inner blade of Patent Document 3 supports two cutting blades with a pair of discs, there is no care that fouls accumulate on the inner blade. However, since the whisker is only cut with two cutting blades while the inner blade rotates once, the whisker cannot be cut more effectively than the inner blade of Patent Document 1 that uses a spiral blade as a cutting element. There is a problem with the point.

  The purpose of the present invention is a rotation that can be cut efficiently by introducing a cutting object such as a beard or a hairball effectively, with a simple structure and reducing manufacturing cost compared to a rotary blade having a spiral blade as a cutting element. It is providing the small electric equipment provided with the blade and the rotary blade.

  The rotary blade of the present invention comprises a cylindrical blade-like rotary blade 11 provided with 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 blade body 20 is provided with rib-shaped blades 25 and 26 and blade holes 27 formed between the blades 25 and 26. On the peripheral surface of the blade support 21, blade receiving portions 31 that receive the blade body 20 and fuzz receiving surfaces 32 that are recessed from the peripheral surface of the blade receiving portion 31 toward the rotation center are alternately provided. A fluff receiving space 33 is formed in a circular shape between the blade body 20 fixed to the blade support 21 and the fluff receiving surface 32.

  The fluff receiving surface 32 is formed as a concave curved surface, and the outer edge of the fluff receiving surface 32 is continuous with the circular peripheral edge of the circular blade receiving portion 31.

  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 fluff receiving surface 32 and the rotating shaft 22 are: The inequality (D1> D2> D3) is satisfied.

  The width h <b> 2 of the peripheral frame 29 positioned at both side ends of the blade body 20 is set to be smaller than the width h <b> 3 of the blade receiving portion 31 positioned at both side ends of the blade support 21.

  Both side end surfaces of the blade body 20 are flush with side end surfaces of the blade receiving portions 31 located at both side ends of the blade support 21.

  The blade body 20 is formed in a rectangular shape including 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. The width h2 of the peripheral frame 29 on the short side portion 24 side is set smaller than the width h1 of the peripheral frame 28 on the long side portion 23 side.

  The blade body 20 is provided with a first blade 25 that is inclined with respect to the rotation center of the rotary blade 11 and a second blade 26 that intersects the first blade 25. The second blade 26 is inclined in the direction opposite to the first blade 25 with respect to the rotation center so that the reinforcing function and the whisker cutting function of the first blade 25 can be exhibited simultaneously.

  The inclination angle θ1 with respect to the rotation center of the first small blade 25 and the inclination angle θ2 with respect to the rotation center of the second small blade 26 are made different. The second small blades 26 are arranged so as to intersect with the first small blades 25 arranged in a linear rib shape in a state where the intersection with the first small blades 25 has a three-way shape.

  Said rotary blade 11 is applied to the small electric equipment provided with the rotary blade which rotationally drives with the motor 12 * 70 and cut | disconnects cutting object.

  In the present invention, the blade body 20 and the blade support 21 provided with the small blades 25 and 26 form the rotary blade 11 as a whole in a cylindrical bowl shape. 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 the blade receiving portion 31 and the fluff receiving surface 32 that is recessed from the blade receiving portion 31 toward the center of rotation, and the blade receiving portion 31 to which the blade body 20 is fixed is provided with the fluff receiving portion. Since it supports with the surface 32, the intensity | strength of the blade support body 21 can be improved, strengthening the structural strength of the blade receiving part 31. FIG. Further, by providing the fluff receiving surface 32 that is recessed toward the center of rotation, a circular fluff receiving space 33 is formed between the blade body 20 and the fluff receiving surface 32, so that the cut fluff is small. It is possible to reliably prevent the blades 25 and 26 from adhering to or accumulating in the vicinity of the cutting blade 47.

  When the fluff 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 formation of the inner corner portion where fouling is likely to accumulate is eliminated in the fluff receiving space 33. Thus, the accumulation of the dust on the inner surface of the blade body 20 and the peripheral surface of the hair receiving surface 32 can be eliminated. In addition, since the dust attached 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 cut flakes 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.

  If the relative dimensions of the three of the blade receiving portion 31, the fouling receiving surface 32, and the rotary shaft 22 are configured to satisfy the inequality (D1> D2> D3), the overall strength of the blade support 21 is increased. It is possible to increase the rotational inertial force when the rotary blade 11 is driven while ensuring sufficient. 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 fluff receiving surface 32 with a large diameter D2 can be increased as compared with the rotary shaft 22, the fluff adhering to the fluff receiving surface 32 is discharged to the outside of the rotary blade 11 while being effectively shaken off. it can.

  If 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, washing of the rotary blade 11 with water can be easily performed. It can be done quickly. This is because the washing water flowing in from the blade hole 27 is reversed by the fouling receiving surface 32 and then prevented from being received by the inner edge of the peripheral frame 29, so that the fouling can be washed out together with the washing water. is there. When the washing water flows into the fluff receiving space 33, the peripheral frame 29 on the short side 24 side does not get in the way.

  When the 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 the filings tend to accumulate are formed on the side end surfaces of the blade receiving portion 31. By avoiding this, the accumulation of fouling at the side end of the blade support 21 can be eliminated.

  When the blade body 20 is formed in a rectangular shape and the width h2 of the peripheral frame 29 on the short side 24 side along the circumferential direction is set smaller than the width h1 of the peripheral frame 28 on the long side 23 side, press working is performed. The deformation stress of the peripheral frame 29 can be reduced. Therefore, the bending process of the blade body 20 formed in an arc shape can be performed easily and accurately.

  If the blade body 20 is provided with the first small blade 25 inclined and the second small blade 26 inclined in the direction opposite to the first small blade 25 is provided, the total length of the cutting blade 47 is further increased, and the whisker is Cutting of hair balls and pills can be efficiently performed 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.

  If the inclination angle θ1 of the first small blade 25 and the inclination angle θ2 of the second small blade 26 are different, the small blades 25 and 26 capture and cut beards and hairs facing in different directions. it can. 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.

  According to the small electric device provided with the rotary blade 11 according to the present invention, by rotating the rotary blade 11 with motor power, a cutting target such as a beard, a hairball, or a nail can be effectively cut. The cutting process can be performed efficiently.

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.

(Example) FIGS. 1-11 shows the Example which applied the rotary blade which concerns on this invention to the 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 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 comprising an outer blade 10 and an inner blade (rotating blade) 11, and further, a motor 12 that rotationally drives the inner blade 11, and the rotational power of the motor 12 is transmitted to the inner blade 11. A driving structure 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 so that the inequality (h1> = h2) can be satisfied. did. 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).

  Next, the detail of the manufacturing method of the inner blade 11 is demonstrated. The inner blade 11 is formed by etching a stainless steel plate 36 (metal plate) as shown in FIG. 6 to form a first blank 37 to be the blade body 20 (etching step), and as shown in FIG. A process of pressing the blank 37 to form a second blank 38 bent into a partial arc (pressing process), and welding the second blank 38 to the blade support 21 as shown in FIG. The step of forming the third blank 39 to be the inner blade 11 (welding step), the step of heat-treating the third blank 39 (heat-treatment step), and the step of grinding the third blank 39 after the heat treatment ( Grinding process). The etching process is different from the conventional inner blade manufacturing method in that the etching process is performed in the state of a commercially available material.

(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.

  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 the phase position in the circumferential direction of the blade body 20 is assumed, the base surface is arranged such that the phase position of the front edge on the upper side in the rotational direction of the base surface 44 matches the phase position of the relief edge 48. The formation position of 44 is shifted to the lower side in the rotational direction with respect to the formation position of the cut surface 43. The second turning surface 46 has a fluff guide surface 46a that slopes inwardly from the escape edge 48 toward the lower rotation side, and a lower dent that connects between the fluff guide surface 46a and the edge of the base surface 44. The surface 46b is formed in a reverse letter shape. Thus, by forming the 2nd bevel surface 46 with two concave curved surfaces, the cross-sectional area by the side of the base surface 44 can fully be ensured, and a blade strength can be improved. Further, by providing the fluff guide surface 46a, the thickness t3 between the first curling surface 45 and the fluff guide surface 46a is made smaller than the other portions, and the cutting portion including the cutting surface 43 and the cutting blade 47 is provided. Can be given springiness.

  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 as to satisfy the inequality (b1 <= b2). In addition, the thickness t1 of the fluff guide surface 46a on the cut surface 43 side is set to 0.15 mm, the thickness t2 of the lower concave surface 46b on the base surface 44 side is set to 0.15 mm, and the first curling surface 45 and the fuzz guide surface 46a. The wall thickness t3 between and is set to 0.2 mm so that the inequalities (T> t3) and (t1 <= t2) are satisfied.

(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 placed on the blade receiving portion 31 of the blade support 21 and positioned. 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, as indicated by reference numerals w1 to w10 in FIG. 5, the group of welded portions 57 are formed in order from the center of the long side portion 23 toward the arc side portion 22 so that the blade body 20 is welded. It is possible to prevent the blade main body 20 from coming into close contact with the blade receiving portion 31 by preventing the internal stress of the blade receiving portion 31 from floating away from the peripheral surface. Further, the welding position (w5 · w6 · w9 · w10) of the welding portion 57 in the arc side portion 22 is set to the arc side portion rather than the welding position (w1 to w4, w7 to w8) of the welding portion 57 in the long side portion 23. By positioning 22 near the center in the width direction, it is possible to prevent the corner portion of the blade body 20 from being lifted off from the peripheral surface of the blade receiving portion 31, and to form the cylindrical blank-shaped third blank 39.

  The welding pattern for forming the group of welded portions 57 in order from the central portion of the straight side portion 23 toward the arc side portion 22 is not limited to the above-described welding pattern, and the following welding pattern 2 and welding This can be done with 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.

  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 short side portion 24 side is made smaller than the width h3 of the blade receiving portion 31, so that the washing water inverted by the fluff receiving surface 32 is surrounded by It can be prevented from being received at the inner edge of the frame 29, and the hair chips can be reliably washed away together with the washing water. When the washing water flows into the fluff receiving space 33, the peripheral frame 29 on the 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.

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 formed by an etching method, and includes a group of rib-shaped small blades 25 and 26 and a group of blade holes 27. 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 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 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 has a fluff guide surface 46a that slopes inwardly from the escape edge 48 toward the lower rotation side, and a lower dent that connects between the fluff guide surface 46a and the edge of the base surface 44. The surface 46b is formed in a reverse letter shape.

  According to the rotary blade 11 described above, the width b1 of the cutting surface 43 is set equal to or smaller than the width b2 of the base surface 44 while sharpening the cutting blade angle of the cutting blade 47, and the first and second Since the sliding contact resistance of the 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. Further, the cutting edge angle of the cutting edge 47 is secured while the second curving surface 46 is formed in an upside down shape by the fluff guide surface 46a and the lower recessed surface 46b, and a sufficient cross-sectional area on the base surface 44 side is secured. 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. Moreover, by forming the second curled surface 46 in an inverted shape, the wall thickness t3 between the inner concave surface forming the first curled surface 45 and the fuzz guide surface 46a is made smaller than the other portions. Spring property can be imparted to the cutting portion including the cutting surface 43 and the cutting edge 47. That is, it is possible to obtain the inner blade 11 including the small blades 25 and 26 that can exhibit supple elasticity despite having sufficient small blade strength.

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

  According to the rotary blade 11 described above, the downwardly inclined fluff guide surface 46a can be formed in a portion approximately half of the entire thickness of the blade body 20 or above it, so that the strength of the entire blade is ensured. In addition, the hairs and the like cut by the small blades 25 and 26 can be guided along the hair guide surface 46a and reliably fall into the hair receiving space 33. Accordingly, it is possible to prevent the dust from being discharged to the upper peripheral surface of the inner blade 11 when cutting the beard.

  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 shape of the first blade 25 and the second blade 26. 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 connects the fuzz guide surface 46 a that is inclined downward inward from the escape edge 48 toward the lower rotation side, and the fuzz guide surface 46 a and the edge of the base surface 44. The lower concave surface 46b was formed in a reverse letter shape. Further, the position of the relief edge 48 of the cut surface 43 was positioned on the lower side in the rotational direction than the front edge of the base surface 44. In addition, the thickness t2 of the lower recessed surface 46b was set to 0.2 mm, and the thickness t1 of the fuzz guide surface 46a was set to 0.1 mm so as to satisfy the inequality (t1 <= t2). When the total thickness T was 0.3 mm, the wall thickness t3 between the first rib surface 45 and the fuzz guide surface 46a was set to 0.25 mm so that the inequality (T> t3) was 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) was set to 0.35 mm.

  FIG. 15 shows a modification of the blade body 20. 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.

  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.

  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.

10 Outer blade 11 Inner blade (Rotating blade)
20 Blade body 21 Blade support 22 Inner blade axis (rotary axis)
23 Long side portion 24 Short side portion 25 First blade (small blade)
26 Second blade (small blade)
27 Blade hole 28 Peripheral frame 29 on the long side part Peripheral frame 31 on the short side part Blade receiving part 32 Flue receiving surface 33 Fluff receiving space

Claims (9)

A cylindrical bowl-shaped rotary blade having a blade body (20) whose section is bent in an arc shape, a blade support (21) for supporting the blade body (20), and a rotation shaft (22). ,
The blade body (20) is provided with a rib-shaped blade (25, 26) and a blade hole (27) formed between the blades (25, 26).
On the peripheral surface of the blade support (21), there are a blade receiving portion (31) for receiving the blade body (20), and a fluff receiving surface (32) recessed from the peripheral surface of the blade receiving portion (31) toward the center of rotation. Are provided alternately,
A rotary blade characterized in that a fluff receiving space (33) is formed in a circular shape between a blade body (20) fixed to the blade support (21) and the fluff receiving surface (32).   The rotary blade according to claim 1, wherein the fluff receiving surface (32) is formed as a concave curved surface, and the outer edge of the fluff receiving surface (32) is continuous with the circular peripheral edge of the circular blade receiving portion (31). .   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 blade receiving portion (31) The rotary blade according to claim 1 or 2, wherein the three of the fuzz receiving surface (32) and the rotary shaft (22) are configured to satisfy the inequality (D1> D2> D3).   The width (h2) of the peripheral frame (29) located at both side ends of the blade body (20) is set smaller than the width h3 of the blade receiving part (31) located at both side ends of the blade support (21). The rotary blade according to claim 2 or 3.   The both side end surfaces of the blade body (20) are flush with the side end surfaces of the blade receiving portions (31) located at both side ends of the blade support (21). Rotary blade. 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 width h2 of the peripheral frame (29) on the short side (24) side is set smaller than the width (h1) of the peripheral frame (28) on the long side (23) side. The rotary blade described in one. The blade body (20) is provided with a first blade (25) that is inclined with respect to the rotation center of the rotary blade (11) and a second blade (26) that intersects the first blade (25). And
The second cutting edge (26) is inclined in the direction opposite to the first cutting edge (25) with respect to the rotation center, and the reinforcing function and the whisker cutting function of the first cutting edge (25) can be exhibited simultaneously. Item 7. The rotary blade according to any one of Items 1 to 6. 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),
The second cutting edge (26) is arranged to intersect with the first cutting edge (25) arranged in a straight rib shape in a state where the intersecting portion with the first cutting edge (25) becomes a three-way shape. Item 8. The rotary blade according to Item 7.   The small electric equipment provided with the rotary blade according to any one of claims 1 to 8, wherein the rotary blade (11) is rotationally driven by a motor (12, 70) to cut an object to be cut.

Images