JP2010082014A - Electric shaver - Google Patents

Abstract

[PROBLEMS] To eliminate the sliding friction between inner and outer blades while minimizing the wear of the inner and outer blades while ensuring the same sharpness as a conventional electric razor.
An inner blade 9 driven by motor power and an inner blade 9 disposed in a state of covering the outer surface of the inner blade 9 are provided. The inner blade 9 and the outer blade 10 are disposed adjacent to the inner and outer sides in a state where the contact pressure becomes zero to prevent sliding friction between the both. For this purpose, the outer blade 10 is shape-supported by the outer blade support 11, and the inner blade 9 is supported by the outer blade support 11 so that it can be driven.
[Selection] Figure 1

Description

  The present invention relates to an electric razor having an inner blade and an outer blade driven by motor power, and is an improvement on contact friction between the outer blade and the inner blade.

  There are roughly three types of cutting blade structures for electric razors. There are three types: a reciprocating type that reciprocally drives the inner blade, a rotary type that rotationally drives the inner blade around a vertical axis or an inclined central axis, and a rotary type that rotationally drives the inner blade around a horizontal central axis. In any of the cutting blade structures, the sharpness can be improved by pressing at least one of the outer blade and the inner blade against the other with a spring so that the inner and outer blades are always in close contact with each other.

  In the electric razor of the present invention, the wear of the inner and outer blades is reduced to eliminate unnecessary consumption of the motor power, and the life of the motor is further improved. For reducing contact friction between the inner and outer blades, for example, the applicant's Patent Document 1 related to the proposal is known. In this case, a blade recess and a relief surface are formed on the front and back of the tip of the small blade constituting the rotary inner blade, and a sliding surface that slides with the outer blade is provided between the two protruding ends. Both the blade recess and the flank are formed in a concave shape by etching the small blade blank, and by reducing the area of the sliding surface formed between the tips of these concave portions, The sliding friction can be reduced. Also in this case, the outer blade is pressed down and biased by a tension spring made of a leaf spring so that the outer blade can always be in close contact with the inner blade.

JP 2008-188098 A (see paragraph number 0031, FIG. 1)

  In the conventional electric shaver, the sharpness can be improved by always bringing the inner and outer blades into close contact without exception regardless of the difference in the form of the cutting blade structure. Therefore, in a state where the motor is operating, sliding friction is always generated between the inner and outer blades, and a part of the motor power is wasted correspondingly. Furthermore, even when the whiskers are not cut, it is necessary to overcome the previous sliding friction and drive the inner blade, so the driving load is always applied to the motor, and the life of the motor is correspondingly increased. Shorter.

  The purpose of the present invention is to eliminate the sliding friction between the inner and outer blades by ensuring that the inner and outer blades are always in close contact with each other while ensuring the same sharpness as a conventional electric razor, thereby minimizing the wear of the inner and outer blades. An object is to provide an electric razor that can eliminate wasteful consumption of motor power while the motor is in operation and can further improve the life of the motor.

  The electric razor of the present invention includes an inner blade 9 that is driven by motor power, and an outer blade 10 that is disposed in a state of covering the outer surface of the inner blade 9. Thus, the inner blade 9 and the outer blade 10 are adjacently arranged inside and outside in a state where the contact pressure becomes zero.

  The outer cutter 10 is shaped and supported by the outer cutter support 11. Furthermore, as shown in FIG. 1, the inner blade 9 is supported by the outer blade support 11 so as to be driven, and the inner blade 9 and the outer blade 10 are unitized as a cutting blade unit 28.

  The inner blade 9 includes a blade body 16, an inner blade support 14 that supports the blade body 16, and a passive body 15 that inherits motor power and transmits the motor power to the inner blade support 14. One of the inner blade support 14 and the passive body 15 is supported by the inner blade support structure 26 provided on the outer blade support 11 so as to be capable of shear movement with respect to the outer blade 10. The inner blade support structure 26 is arranged in a state where it is located within the outline of the outer blade 10.

  The outer blade 10 before being assembled to the outer blade support 11 is subjected to plastic deformation and shaped into a predetermined shape.

  In the molding process of the outer cutter support 11 made of a plastic molded product, the outer cutter 10 is insert-fixed to the outer cutter support 11 and held in a predetermined shape.

  The inner surface of the outer blade 10 shaped into a predetermined shape is ground to finish the inner surface of the outer blade 10 in a shape that matches the outer surface shape of the inner blade 9.

  In a rotary electric shaver in which inner blade shafts 15 provided on both left and right sides of the inner blade 9 are rotatably supported by a pair of left and right bearing bodies 26 mounted on the outer blade support 11, the outer blade support 11 A bearing mounting hole 24 in which the bearing body 26 is mounted, and a slit 25 for assembling and guiding the inner blade shaft 15 to the bearing mounting hole 24 are formed in each of the side walls 20 disposed opposite to each other. Thus, the inner blade shaft 15 positioned inside the bearing mounting hole 24 through the slit 25 and the bearing body 26 are simultaneously mounted in the bearing mounting hole 24, and the inner blade 9 is rotated through the bearing body 26. Support the shaft freely.

  The cutting blade unit 28 is detachably attached to the attachment portion 35 of the razor head 2. A lock structure is provided between the razor head 2 and the cutting blade unit 28 so as to lock and hold the cutting blade unit 28 so as not to be separated.

  In the electric shaver according to the present invention, the inner blade 9 and the outer blade 10 are disposed adjacent to the inner and outer sides in a state where the contact pressure is zero, so that sliding friction is prevented between the inner and outer blades 9 and 10. It is possible to extend the blade life by minimizing the wear of the double blades 9 and 10. Further, it is possible to eliminate unnecessary consumption of motor power when the motor 7 is in operation, and further reduce the load acting on the motor 7 to improve the motor life. The inner and outer blades 9 and 10 are not urged by a spring and perform whisker cutting in a state where the contact pressure becomes zero, but the same sharpness as a conventional electric razor that closely contacts the inner blade to the outer blade is ensured. The whiskers can be cut smoothly.

  When the outer blade 10 is shape-supported by the outer blade support 11 and the inner blade 9 is supported by the outer blade support 11 so that it can be driven, the positional accuracy of the inner blade 9 and the outer blade 10 is improved, and the inner and outer blades 9 are improved.・ Sliding friction can be reliably prevented between 10 and the wear of the inner and outer blades 9, 10 and unnecessary consumption of motor power can be more reliably eliminated. Further, by assembling the inner and outer blades 9 and 10 to the outer blade support 11, the components of the shear blade can be unitized as a single cutting blade unit 28, so that it can be attached to and detached from the razor head 2 and both the inner and outer blades 9 and 10. It is possible to easily replace the blade when it wears out.

  The blade body 16, the inner blade support body 14, the passive body 15, etc. constitute the inner blade 9, and the inner blade support structure 26 provided in the outer line of the outer blade 10 provides the inner blade support body 14 and the passive body 15. If one of them is supported so as to be able to move in a shearing manner, the inner blade support 14 or the passive body 15 can be supported so as to be able to move in a shearing manner at a position close to the outer blade 10. E can be accurately defined and the whiskers can be cut smoothly.

  If the outer cutter 10 is plastically deformed in advance and shaped into a predetermined shape, and the shaped outer cutter 10 is assembled to the outer cutter support 11, the outer blade 10 in the state assembled to the outer cutter support 11 is removed. The variation in the shape of the blade 10 can be eliminated, the inner and outer blades 9 and 10 can be more appropriately arranged adjacent to each other, and the whiskers can be cut more smoothly.

  In the process of plastic molding of the outer cutter support 11, if the outer cutter 10 is insert-fixed to the outer cutter support 11 and held in a predetermined shape, for example, the outer cutter 10 is caulked and fixed to the outer cutter support 11, or Compared to the case of welding and fixing, the curved shape of the outer blade 10 and the variation in the mounting position with respect to the outer blade support 11 can be greatly reduced, and the shape can be maintained with high accuracy. Moreover, the trouble of assembling the outer cutter 10 to the outer cutter support 11 can be saved, the number of assembling steps can be reduced, and the cost can be saved.

  When the inner surface of the outer blade 10 shaped into a predetermined shape is ground to finish the inner surface of the outer blade 10 to a shape that matches the outer surface shape of the inner blade 9, the shape accuracy of the inner surface of the outer blade 10, In addition, the surface accuracy of the inner surface can be remarkably improved, and sliding friction between the inner and outer blades 9 and 10 can be prevented.

  In the electric razor provided with the rotary inner blade 9, a bearing mounting hole 24 and a slit 25 are formed in each of the side walls 20 of the outer blade support 11, and inside the bearing mounting hole 24 through the slit 25. When the bearing body 26 is simultaneously mounted in the positioned inner blade shaft 15 and the bearing mounting hole 24, the inner blade 9 can be easily assembled to the outer blade support 11 with less effort. Further, since the inner cutter shaft 15 is pivotally supported by the bearing body 26, the variation in the assembly position of the inner cutter 9 to the outer cutter support 11 can be eliminated, and the rotational runout amount when the inner cutter 9 is rotationally driven can be reduced. Can be small.

  When the cutting blade unit 28 is mounted on the mounting portion 35 of the razor head 2 and the cutting blade unit 28 mounted on the mounting portion 35 is held in a non-separable state by a lock structure, the inner blade can be simply unlocked by operating the lock structure. The cutting blade unit 28 including 9 and the outer blade 10 is separated from the attachment portion 35, and the inner blade 9, the outer blade 10, and the attachment portion 35 can be cleaned. When the inner blade 9 and the outer blade 10 are worn out, the inner and outer blades 9 and 10 can be simultaneously updated by replacing the cutting blade unit 28 to recover the sharpness.

(Example) FIG. 1 thru | or FIG. 9 shows the Example of the electric shaver provided with the rotary type inner blade which concerns on this invention. In FIG. 2, the electric razor includes a main body portion 1 that also serves as a grip, and a razor head 2 that is supported by the main body portion 1 so as to be able to float in the vertical and forward / backward and left / right directions. Inside the main body 1, two secondary batteries 3, a circuit board and a switch (not shown) are arranged. On the front surface of the main body 1, a push button type switch button 4 for switching the previous switch, an indicator lamp (not shown), and the like are arranged.

  As shown in FIG. 3, the razor head 2 includes a motor 7 that outputs rotational power, a gear mechanism 8 that transmits the rotational power of the motor 7, and a rotary type that is connected to the final stage of the gear mechanism 8 and is rotationally driven. The inner blade 9, the outer blade 10 that covers the outer surface of the inner blade 9, the outer blade support 11 that retains and supports the outer blade 10 in an inverted U shape, and the outer blade support 11 that is held in a non-separable manner. A lock structure is provided.

  In FIG. 4, the inner blade 9 includes a cylindrical inner blade support body 14, an inner blade shaft (passive body) 15 fixed along the axis of the inner blade support body 14, and the peripheral surface of the inner blade support body 14. And 10 small blades (blade main bodies) 16 which are implanted in a spiral shape along the line. The inner blade shaft 15 and the small blade 16 are insert-fixed when the inner blade support 14 is injection-molded, and are provided integrally with the inner blade support 14. The obtained inner blade unit is subjected to grinding to form a cutting blade 16a (see FIG. 1) at the tip of the small blade 16. The inner blade shaft 15 can be integrally formed when the inner blade support 14 is formed, and can be formed as a plastic shaft.

  The outer blade 10 is made of a sheet-like mesh blade obtained by electroforming nickel alloy, and a group of a blade frame 10a having a trapezoidal cross section and a whisker introduction hole 10b are regularly formed on the sheet surface. (See FIG. 1). After subjecting the sheet-shaped outer blade blank obtained by electroforming to plastic deformation and shaping into an inverted U-shape as shown in FIG. 5, the obtained inverted U-shaped outer blade 10 is used as the outer blade. The insert 11 is fixed to the support 11. Four mounting holes 18 are formed in the front and rear edges of the outer blade 10.

  As shown in FIGS. 6 and 8, the outer blade support 11 includes a pair of left and right side walls 20, front and rear walls 21 and 22 that connect the side walls 20, and an L-shape projecting on the left and right sides of the front and rear walls 20 and 21. It consists of an injection-molded product integrally provided with the lock leg 23. Each of the left and right side walls 20 is formed with a bearing mounting hole 24 for mounting a bush-shaped bearing body 26 described later and a slit 25 for assembling and guiding the inner blade shaft 15 in a keyhole shape. If the slit 25 is formed in a notch shape continuously to the bearing mounting hole 24 in this way, the strength of the side wall 20 is prevented from being lowered by the slit 25, and the structural strength of the outer blade support 11 can be improved. For example, when the slit 25 is formed in a groove shape from the lower end of the side wall 20 to the bearing mounting hole 24, it is inevitable that the lower part of the side wall 20 is divided by the slit 25 in the front and rear direction. The structural strength of the outer blade support 11 is reduced by that amount.

  The outer blade 10 is insert-fixed to the outer blade support 11 with its front and rear edges and mounting holes 18 embedded in the front and rear walls 21 and 22, and further, both left and right sides embedded in both side walls 20. Thus, when the entire periphery of the inverted U-shaped outer cutter 10 is insert-fixed to the outer cutter support 11, the outer cutter 10 can be fixed and held so that it cannot be deformed. 11 can be fixed inseparably. As shown in FIG. 7, the obtained outer blade unit grinds the inner surface of the outer blade 10 with a grinding wheel G to finish the inner surface shape of the outer blade 10 to a shape that matches the outer surface shape of the inner blade 9. Specifically, the upper half of the inner surface of the outer blade 10 is ground in a partial arc shape, and the radius value of the partial arc portion passing through the cutting blades 10c formed on the group of blade frames 10a is equal to that of the cutting blade 16a described above. Finish to be the same as the radius value of the rotation trajectory.

  In the present invention, as shown in FIG. 1, the inner blade 9 and the outer blade 10 are arranged adjacent to each other in a state in which the contact pressure between them is zero, so that the sliding between the inner blade 9 and the outer blade 10 is achieved. Dynamic friction was prevented from occurring. Specifically, the inner blade 9 is rotatably supported by the outer blade support 11, and the outer blade 10 is fixedly supported by the outer blade support 11, and the inner blade 9 and the outer blade 10 are biased springs or the like. I tried to avoid sticking under pressure. In most cases, a minute gap E was ensured between the inner blade 9 and the outer blade 10 so that the contact pressure between them was zero. Since the average diameter of the whiskers is 100 μm, the value of the minute gap E is preferably 50 μm or less, and more preferably within the range of 0 to 10 μm. If the contact pressure between the inner blade 9 and the outer blade 10 is zero, the minute gap E may be zero.

  When the inner blade 9 is assembled to the outer blade support 11, the inner blade shaft 15 of the inner blade 9 is positioned inside the bearing mounting hole 24 through the slit 25, and the bearing body ( Inner blade support structure) 26 is externally fitted, and at the same time, the bearing body 26 is mounted in the bearing mounting hole 24, and the inner blade 9 is rotatably supported by the bearing body 26. Further, the inner blade gear 27 is press-fitted and fixed to one inner blade shaft 15. In this way, the inner blade 9 is pivotally supported by the outer blade support 11 via the bearing body 26 so as to be rotatable, whereby a cutting blade unit 28 in which the inner blade 9 and the outer blade 10 are assembled can be obtained. . The inner blade shaft (passive body) 15 in the cutting blade unit 28 is disposed within the front-rear dimension of the outer blade 10 and within the vertical dimension, that is, within the outline of the outer blade 10. The direction of rotation when the inner blade 9 is driven is indicated by arrows in FIGS.

  As shown in FIGS. 3 and 9, the gear mechanism 8 uses the output gear 31 fixed to the output shaft of the motor 7 and the face gear 32 meshing with the output gear 31 to provide the rotational power of the motor 7 about the vertical axis. After being converted into rotational power around the horizontal axis and further decelerated via a gear train 33 arranged on one side of the razor head 2, it is transmitted to the inner blade gear 27. Of the spur gear constituting the gear train 33, only the upper part of the final gear 34 is exposed to the mounting portion 35 for the cutting blade unit 28 provided in the razor head 2.

  The attachment portion 35 is formed on the head frame 38 constituting the razor head 2. Specifically, a pair of left and right side frames 39 protruding from the upper end of the head frame 38 and a bottom wall 40 connecting the base end portions of the both side frames 39 are formed in an inverted portal shape. A rectangular positioning wall 41 bulges on the upper surface of the bottom wall 40. In a state in which the cutting blade unit 28 is mounted on the mounting portion 35, the movement of the outer blade support 11 in the left-right direction is restricted by the pair of side frames 39 as shown in FIG. 9, and the movement in the front-rear direction as shown in FIG. Is regulated by the positioning wall 41. In addition, the cutting blade unit 28 is locked and held in a non-separable manner by a lock structure provided between the razor head 2 and the outer blade support 11.

  3 and 9, the lock structure includes a lock frame 44 disposed inside the head frame 38, a lock spring 45 that moves and urges the lock frame 44 to a lock posture, and a lock that is fixed to one end of the lock frame 44. The release button 46 and four lock legs 23 provided on the outer blade support 11 are configured. On the upper surface of the lock frame 44, four lock claws 47 that engage with the lock legs 23 protrude. With the lock claws 47 facing the lock opening 48 opened in the bottom wall 40, the lock frame 44 is disposed inside the head frame 38, and the entire lock frame 44 can be slid left and right with a guide structure not shown. Support guide.

  As shown in FIG. 9, in a state where the cutting blade unit 28 is mounted on the attachment portion 35, the lock leg 23 is engaged and captured by the lock claw 47, so that the cutting blade unit 28 can be locked and held so as not to be separated. When the cutting blade unit 28 is removed from the mounting portion 35, the lock release button 46 exposed on the outer surface of the side frame 39 is pushed against the urging force of the lock spring 45 to operate the lock leg 23 and the lock claw 47. Release the engaged state. The inner blade 9 and the outer blade 10 are exchanged together with the cutting blade unit 28 by removing the outer blade support 11 from the attachment portion 35.

  As described above, in the electric shaver of the present invention, when the inner blade 9 and the outer blade 10 are disposed adjacent to each other in a state where the contact pressure between them is zero, and the inner blade 9 is rotationally driven and sheared, Since the blade 9 and the outer blade 10 are prevented from sliding relative to each other, the occurrence of sliding frictional resistance between the blades 9 and 10 can be eliminated, and the wear of the inner and outer blades 9 and 10 can be minimized. In addition, since sliding friction between the blades 9 and 10 is prevented, it is possible to eliminate unnecessary consumption of the motor power when the motor 7 is operating, and further reduce the addition acting on the motor 7 to reduce the motor life. Can be improved.

  The beard at the time of shaving enters the beard introduction hole 10b, is then captured by the cutting blade 16a of the small blade 16, is pressed against the blade frame 10a of the outer blade 10, and the cutting blade 10c provided at the side end of the cutting blade 10c. Is cut by a shearing action with the cutting edge 16a. Incidentally, the diameter of the whiskers is approximately 100 μm, and the minute gap E between the two cutting edges 10c and 16a is only 10 μm at most. Therefore, when the whiskers are cut, the minute gap E does not become a problem, and the whiskers can be cut while ensuring the same sharpness as a conventional electric razor in which the inner blade and the outer blade are in close contact with each other. When the outer blade 10 is strongly pressed against the skin surface, the central portion of the outer blade 10 may be bent and deformed and contact the small blade 16. Even in such a case, the pressing force acting on the outer blade 10 is released, and at the same time, the outer blade 10 returns to the original state and is separated from the small blade 16 by the minute gap E. Therefore, the inner blade 9 and the outer blade Generation of frictional resistance due to sliding with 10 can be avoided as much as possible.

  10 to 12 show an embodiment in which the present invention is applied to an electric razor having a reciprocating inner blade. The inner blade 9 includes a blade body 16 formed of a slit blade, an inner blade support body 14 that fixes and supports the blade body 16, and a passive body 15 that inherits the reciprocating motion of the vibrator 51. The passive body 15 is formed integrally with the inner blade support 14. The blade body 16 is formed by etching the stainless steel plate material and then bending the obtained inner blade blank into an inverted U-shaped cross section. Four attachment holes 53 are formed in the lower part of the front and rear surfaces of the blade body 16, and these attachment holes 53 are engaged with the welding pins 54 provided on the inner blade support 14, so that the tip portions of the welding pins 54 are engaged. Is integrated with the inner blade support 14 by melting and deforming.

  The inner blade support 14 is integrally provided with a horizontally long base frame portion 56 whose upper and lower surfaces are open and side frames 57 that are erected on both sides of the base frame portion 56. The passive body 15 is formed at the center of the left and right in a state of bridging the front and rear frame walls. Slide ribs 58 are integrally formed on the front surface and the rear surface of the base frame portion 56, and these slide ribs 58 are guided and supported by the outer blade support 11. Specifically, guide grooves (inner blade support structure) 59 are provided on the inner surfaces of the front and rear walls of the outer blade support 11, and the slide ribs 58 are slidably guided by these guide grooves 59. As shown in FIG. 12, the outer blade support 11 has one side wall 20 formed as a separate part. After the slide protrusion 58 is inserted into the guide groove 59 and the inner blade 9 is assembled to the outer blade support 11, The side wall 20 is assembled to the outer blade support 11.

  As shown in FIG. 11, the inner blade 9 assembled to the outer blade support 11 is arranged adjacent to the outer blade 10 in a state in which the contact pressure becomes zero as in the previous embodiment. When the blade 9 is driven to reciprocate and move in a shearing manner, the occurrence of sliding friction resistance between the blades 9 and 10 can be eliminated, and the wear of the inner and outer blades 9 and 10 can be minimized. In addition, since the spring for tightly urging the inner blade 9 toward the outer blade 10 and the urging spring for bringing the outer blade 10 into close contact with the inner blade are omitted, the inner blade 9 is used in a shearing drive state, or In any case when not in use, the contact pressure between the inner blade 9 and the outer blade 10 can be made zero. In the case where the minute gap E is provided between the inner and outer blades 9 and 10, the value can be kept constant. The rotational power of the motor 7 is converted into reciprocating power through the eccentric cam 61 and the vibrator 51, and is transmitted to the passive body 15 through the drive shaft 62 provided on the top of the vibrator 51. Since other structures are the same as those of the previous embodiment, the same members are denoted by the same reference numerals, and the description thereof is omitted. The same applies to the following embodiments.

  13 to 15 show another embodiment of the cutting blade unit 28. There, the outer cutter 10 was welded and fixed to the outer cutter support 11. Further, the reinforcing body 65 is added to improve the structural strength of the outer blade support 11, and at the same time, the inner blade 9 is pivotally supported by the reinforcing body 65 so that the positional accuracy can be improved. The outer blade 10 is formed in an inverted U shape by subjecting an outer blade blank formed by electroforming to plastic deformation. Six mounting holes 18 are formed in the front and rear edges of the outer blade 10, and these mounting holes 18 are engaged with welding pins 66 provided on the inner surfaces of the front and rear walls 21 and 22 of the outer blade support 11. Then, the tip of the welding pin 66 is melted and deformed to be fixed to the inner surface side of the outer blade support 11. After that, the inner surface of the outer blade 10 is ground and finished.

  The reinforcing body 65 is formed of a plastic molded product integrally provided with a flat base 67, a pair of left and right bearing frames 68, and the lock legs 23, and the bearing body 26 is insert-fixed near the upper end of the bearing frame 68. . On the face wall of the base 67, an opening 71 for discharging the hair dust is formed. The cutting blade unit 28 is assembled in the following procedure. First, the outer blade 10 is welded and fixed to the outer blade support 11. Next, the inner blade shaft 15 is positioned inside the bearing mounting hole 24 through the slit 25, and the reinforcing body 65 is temporarily assembled under the outer blade support 11. In this state, while the bearing frame 68 is expanded left and right and elastically deformed, the bearing body 26 is fitted into the bearing mounting hole 24, and at the same time, the inner blade shaft 15 is fitted into the bearing hole of the bearing body 26, The bearing body 26 is rotatably supported. Further, the inner blade gear 27 is press-fitted and fixed to one inner blade shaft 15. Finally, the base 67 is fixed with a welding pin 70 (see FIG. 15) provided at the lower part of the outer blade support 11, and the reinforcing member 65 is integrated with the outer blade support 11 to form the cutting blade unit 28. When the pair of front and rear inner blades 9 is pivotally supported by the outer blade support 11 and the reinforcing body 65, the final gear that meshes with the inner blade gear 27 is pivotally supported on the outer surface of the bearing frame 68, The cutting blade unit 28 can be used. The bearing frame 68 in this embodiment functions as an inner blade support structure.

  The bearing body 26 can be formed integrally with the reinforcing body 65, and when the forming material is plastic, the reinforcing body 65 may be formed of a low friction resin such as a fluororesin. Further, when the bearing body 26 and the reinforcing body 65 are integrally formed as a metal molded product, the forming material may be formed of an oil-containing metal. Furthermore, when the bearing body 26 and the reinforcing body 65 are formed as a metal press-molded product or a cast product, an oil lubrication structure may be provided in the bearing body 26. The bearing body 26 may be integrated by being press-fitted and fixed to a reinforcing body 65 made of a metal press-formed product or a cast product.

  16 to 18 show still another embodiment of the cutting blade unit 28. In this case, the outer blade 10 was formed by etching the stainless steel plate. Moreover, the outer blade support 11 was formed of a zinc die cast product, and the front and rear edge portions of the outer blade 10 covered on the outer surface were spot welded. The side wall 20 of the outer blade support 11 is formed with a bearing mounting hole 24 and a notch-shaped slit 25 in the shape of a keyhole so that the peripheral edge of the side wall 20 is not divided into front and rear by the slit 25 to support the outer blade. The structural strength of the body 11 can be improved. Also in this embodiment, the reinforcing body 65 is added in the same manner as in the previous embodiment, but the reinforcing body 65 described above is that a slit 73 having the same width as the diameter dimension of the bearing hole 69 is formed in the bearing frame 68. And different. In this embodiment, after the inner blade 9 is temporarily assembled in the bearing mounting hole 24, the bearing body 26 is fitted to the inner blade shaft 15 and the bearing mounting hole 24, and then the reinforcing body 65 is assembled to the outer blade support 11. It is only necessary to simplify a series of assembly operations. As shown in FIGS. 17 and 18, in a state where the inner blade 9 and the reinforcing body 65 are assembled to the outer blade support body 11, the bearing body 26 is connected to the bearing mounting hole 24 of the outer blade support body 11 and the reinforcing body 65. Positioning is performed while being held in the bearing hole 69. The reinforcing body 65 is bonded and fixed to the outer blade support 11.

  19 to 21 show still another embodiment of the cutting blade unit 28. FIG. In this case, the outer blade 10 was formed as a nickel electroformed product, and then pressed and bent into an inverted U shape. In order to retain the shape of the outer blade 10, a shape retaining frame 75 made of a stainless steel plate is added. The shape retaining frame 75 is formed of a press-molded product integrally including a pair of left and right blade receiving frames 76 formed in an inverted U shape, and a front wall 77 and a rear wall 78 that connect the lower ends of the both blade receiving frames 76. After the outer blade 10 is put on the outer surface of the shape retaining frame 75, a fixing plate 79 joined to the outer surfaces of the front and rear edges of the outer blade 10 is spot-welded to the front wall 77 and the rear wall 78, and the outer blade 10 Is fixed to the shape retaining frame 75. The fixing plate 79 is made of a stainless steel plate, and has projections 80 fitted into the mounting holes 18 along the plate surface. The protrusions of these projections 80 are located in front of the shape retaining frame 75 as shown in FIG. Spot welding is performed in close contact with the wall 77 and the rear wall 78.

  As shown in FIG. 21, the integrated outer blade 10 and shape retaining frame 75 are fitted and fixed to the outer blade support 11 from the lower surface side. In this assembled state, the entire peripheral edge of the outer cutter 10 is securely clamped and fixed inside and outside by the shape retaining frame 75 and the outer cutter support 11. In this embodiment, the bearing body 26 is formed in a keyhole shape so that the slit 25 is closed simultaneously with the bearing body 26 being fitted into the bearing mounting hole 24. If necessary, the outer shape of the bearing body 26 can be rectangular or elliptical.

  22 and 23 show still another embodiment of the cutting blade unit 28. FIG. There, the outer blade 10 was put on the outer surface of the outer blade support 11, and the rear edge side was fixed with a welding pin 66 provided on the outer blade support 11. In addition, the front edge of the outer blade 10 was pulled and biased by a pair of left and right springs 82 so that the outer blade 10 could be in close contact with the outer surface of the outer blade support 11. As described above, when the outer blade 10 is always kept in close contact with the outer blade support 11, the curved shape of the outer blade 10 can be properly held by the arc peripheral surfaces of the pair of left and right side walls 20. The minute gap E provided between the outer cutter 10 and the outer cutter 10 can be maintained at an appropriate value.

  24 and 25 show still another embodiment of the cutting blade unit 28. FIG. In this case, the inner blade 9 is driven to reciprocate in the left-right direction at the same time while being rotationally driven, so that the sharpness of the inner blade 9 can be improved. Specifically, the inner blade shaft 15 is slidably supported by the bearing body 26, and the vibration disc 84 is fixed to one shaft end of the inner blade shaft 15. Nine hemispherical projections 85 are formed at regular intervals on the plate surface of the vibration disc 84 facing the bearing body 26. In addition, an operation body 86 that comes into contact with the protrusion 85 is bulged and formed on the inner wall of the side wall 20 facing the protrusion group of the vibration disc 84. Reference numeral 87 denotes a compression coil spring, and the spring 87 urges the entire inner blade 9 to move rightward in FIG.

  The vibration disk 84 is driven to rotate along with the inner blade 9, and nine projections 85 overcome the urging force of the spring 87 and rotate over the operating body 86 one after another. Therefore, the inner blade 9 slides left and right while rotating. As a result, the cutting edge 16a of the small blade 16 can exhibit both the shearing action and the cutting action at the same time, and the sharpness can be improved as compared with the case where the beard cutting is performed only by the shearing action.

  In addition to the embodiments described above, the present invention can also be applied to an electric razor having a rotary inner blade. In this case, the inner blade may be rotatably supported by an outer blade support that supports the outer blade. . The present invention can also be applied to an electric razor in which a plurality of pairs of inner blades 9 and outer blades 10 are provided on a razor head. The slit 25 can be formed from an arbitrary position around the side wall 20 toward the bearing mounting hole 24.

It is a vertical side view which shows the arrangement structure of an inner blade and an outer blade. It is a front view of an electric razor. It is a vertical front view which shows the drive structure of an inner blade. It is the sectional view on the AA line in FIG. It is a perspective view of an outer blade. It is a vertical front view of an outer blade and an outer blade support body. It is a vertical side view which shows the processing state when grind | polishing an outer blade inside. It is a disassembled perspective view of an inner blade and an outer blade support body. It is a vertical front view of a razor head. It is a vertical front view which shows another Example of a cutting blade unit. It is the BB sectional drawing in FIG. It is the disassembled front view which fractured | ruptured some cutting blade units which concern on FIG. It is a disassembled perspective view which shows another Example of a cutting blade unit. It is a vertical front view of the cutting blade unit which concerns on FIG. It is a vertical side view of the cutting blade unit which concerns on FIG. It is a disassembled perspective view which shows another Example of a cutting blade unit. It is a vertical front view of the cutting blade unit which concerns on FIG. It is a vertical side view of the cutting blade unit which concerns on FIG. It is a disassembled perspective view which shows another Example of a cutting blade unit. FIG. 20 is a longitudinal front view of the cutting blade unit according to FIG. 19. It is a vertical side view of the cutting blade unit which concerns on FIG. It is a partially broken front view which shows another Example of a cutting blade unit. It is a vertical side view of the cutting blade unit which concerns on FIG. It is a vertical front view which shows another Example of a cutting blade unit. It is CC sectional view taken on the line in FIG.

Explanation of symbols

9 Inner blade 10 Outer blade 11 Outer blade support 14 Inner blade support 15 Passive body (Inner blade shaft)
16 Blade body (small blade)
26 Inner blade support structure (bearing body)
59 Inner blade support structure (guide groove)
E Small gap

Claims (8)

An inner blade (9) driven by motor power, and an outer blade (10) disposed in a state of covering the outer surface of the inner blade (9),
An electric shaver characterized in that the inner blade (9) and the outer blade (10) are arranged adjacent to each other in a state where the contact pressure is zero. The outer cutter (10) is shape-supported by the outer cutter support (11),
The inner blade (9) and the outer blade (10) are unitized as a cutting blade unit (28) by supporting the inner blade (9) so that it can be driven by the outer blade support (11). The described electric razor. The inner blade (9) has a blade body (16), an inner blade support (14) that supports the blade body (16), and a passive body (15) that inherits motor power and transmits it to the inner blade support (14). And consists of
Either the inner blade support (14) or the passive body (15) is supported by the inner blade support structure (26) provided on the outer blade support (11) so as to be capable of shearing movement with respect to the outer blade (10). Has been
The electric shaver according to claim 2, wherein the inner blade support structure (26) is disposed in a state of being located within the outer line of the outer blade (10).   The electric shaver according to claim 2 or 3, wherein the outer blade (10) before being assembled to the outer blade support (11) is subjected to plastic deformation and shaped into a predetermined shape.   The outer cutter (10) is insert-fixed to the outer cutter support (11) and held in a predetermined shape in the molding process of the outer cutter support (11) made of a plastic molded product. 4. The electric razor according to 4.   The inner surface of the outer cutter (10) shaped into a predetermined shape is ground so that the inner surface of the outer cutter (10) matches the outer shape of the inner cutter (9). Electric razor as described in A rotary electric machine in which inner cutter shafts (15) provided on the left and right sides of the inner cutter (9) are rotatably supported by a pair of left and right bearing bodies (26) mounted on the outer cutter support (11). A razor,
A bearing mounting hole (24) in which the bearing body (26) is mounted, and an inner blade shaft (15) are mounted in the bearing mounting hole (24) on each of the side walls (20) arranged to face the outer blade support (11). And a slit (25) for guiding assembly.
A bearing body (26) is simultaneously mounted on the inner blade shaft (15) positioned inside the bearing mounting hole (24) through the slit (25) and the bearing mounting hole (24), and the inner blade ( The electric shaver according to any one of claims 2 to 6, wherein 9) is rotatably supported via a bearing body (26). The cutting blade unit (28) is detachably attached to the attachment portion (35) of the razor head (2),
The electric razor according to any one of claims 2 to 7, wherein a lock structure is provided between the razor head (2) and the cutting blade unit (28) to lock and hold the cutting blade unit (28) in a non-separable manner.

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