JP4484147B2 - Rotary electric razor - Google Patents

Description

  The present invention relates to a rotary electric shaver including a vibration mechanism that reciprocally vibrates a rotary inner blade in the left-right direction.

  In the field of a rotary electric shaver, providing a vibration mechanism that reciprocally vibrates the rotary inner blade in the left-right direction is described in Patent Document 1 and is well known. The vibration mechanism there is a rotary inner blade having a linear cutting blade that runs in the left-right direction around the rotation axis, and a cam having an inclined surface continuously provided at either the left or right end of the rotary inner blade, A ball receiving portion that is provided on the inner surface of the main body case and rotatably holds the contact ball, and a coil spring that is interposed between the rotary inner blade and the cam and biases the cam toward the contact ball. . When the rotating shaft is rotated, the cam is pushed by the contact ball and is displaced in the left-right direction, and the amplitude displacement is transmitted to the rotating shaft through the coil spring, thereby moving the rotary inner blade in the left-right direction. The reciprocating vibration force to be applied is applied.

JP 54-65660 A (FIGS. 1 and 2)

  As mentioned above, when the rotary inner blade is reciprocally oscillated in the left-right direction, the cutting blade reciprocates in the left-right direction in addition to the original scissor cutting function derived from the rotation around the rotation axis of the cutting blade. Therefore, the shaving efficiency of the shaver and the sharpness of the electric razor can be greatly improved.

  The biggest problem of the vibration mechanism described in Patent Document 1 is a structure in which one reciprocating vibration force is applied to the rotary inner blade when the rotation shaft makes one rotation. The number of left and right amplitudes is small, and the previous cutting and cutting function is not satisfactorily exhibited. In addition, since the return of the rotary inner blade in the cam direction is left to the urging force of the coil spring, the return action of the coil spring cannot catch up when increasing the reciprocating frequency in the left-right direction per unit time. There is also a problem in that the reciprocating vibration operation of the rotary inner blade tends to be uncertain. Furthermore, since a large number of parts such as cams and coil springs are required, it is inevitable that the manufacturing cost increases as the number of parts increases, and in addition, the assembly work of the parts becomes complicated, and the electric shaver is complicated. It is inevitable that the overall cost will increase.

  An object of the present invention is to provide a shaving efficiency and a sharpness of a rotary type electric shaver having a vibration mechanism that reciprocally vibrates the rotary inner blade in the left-right direction by making the rotary inner blade draw and cut well. The goal is to make a significant improvement. An object of the present invention is to simplify the structure as compared with a vibration mechanism of a conventional form, and therefore to improve the productivity and cost reduction of a rotary electric shaver equipped with the vibration mechanism.

  As shown in FIG. 1, the present invention includes a vibration mechanism that reciprocally vibrates the rotary inner blade 5 that is rotatably supported on the upper portion of the main body case 1 in the left-right direction that is the length direction of the rotary inner blade 5. Intended for rotary electric razors. The rotary inner blade 5 is provided with a plurality of spiral or straight cutting blades 27 on the outer peripheral surface of a cylindrical body portion 26 having a rotating shaft 21, and is provided on the main body case 1 side. Between a pair of bearing walls 15 and 15, it is supported so that rocking in the left-right direction is possible. The vibration mechanism is provided on the side of the main body case 1 so as to sandwich the plurality of minute protrusions 29a and 29b formed to protrude in the left-right direction from the left and right end surfaces 26a and 26b of the body portion 26 and the rotary inner blade 5. It consists of a pair of left and right guide pins 30a and 30b. As shown in FIG. 3, the minute projections 29a and 29b are arranged so that their projecting ends are concentric with the rotation center of the rotary shaft 21, and the minute projections 29a and 29b on the left end surface 26a side and the minute end on the right end surface 26b side are arranged. The protruding ends of the protrusions 29b are arranged so as to exist at alternate phase difference positions that do not overlap when seen through from the left-right direction. As shown in FIG. 5, the distance (d1) between the guide pins 30a and 30b is set to be smaller than the width (d2) in the left-right direction of the body portion 26 including the minute protrusions 29a and 29b. Then, when the rotary inner blade 5 is rotated around the rotation shaft 21, the left and right minute projections 29a and 29b are alternately brought into contact with the guide pins 30a and 30b located at the opposite positions, so that the guide pins 30a and 30b A reciprocating vibration force for reciprocating the rotary inner blade 5 between the rotary inner blades 5 is applied to the rotary inner blade 5.

  As shown in FIG. 3, the microprotrusions 29 a and 29 b can be seen from the left and right directions and arranged on the entire circumference of the concentric position of the rotating shaft 21.

  As shown in FIGS. 6 and 7, the moving speed (v1) around the rotation shaft 21 at the tip of the cutting edge 27 and the amplitude moving speed (v2) in the left-right direction of the rotary inner blade 5 are set to substantially coincide. can do.

  As shown in FIGS. 8 and 9, the rotation radius dimension around the rotation axis 21 of the minute protrusions 29 a and 29 b can be set larger than the rotation radius dimension around the rotation axis 21 at the tip of the cutting edge 27.

  The protrusion dimensions in the left-right direction of the minute protrusions 29a and 29b are preferably set to be larger than 0.2 mm which is the maximum thickness dimension of the flange 32 (see FIGS. 6 and 7).

  In the present invention, the vibration mechanism for reciprocally vibrating the rotary inner blade 5 in the left-right direction includes a plurality of minute protrusions 29a, 29b formed in a protruding shape in the left-right direction from the left and right end surfaces 26a, 26b of the body 26, The rotary inner blade 5 is composed of a pair of left and right guide pins 30a and 30b provided on the main body case 1 side. Then, when the rotary inner blade 5 is rotated around the rotation shaft 21, the left and right minute projections 29a and 29b are alternately brought into contact with the guide pins 30a and 30b located at the opposite positions, so that the guide pins 30a and 30b A reciprocating vibration force for reciprocating the rotary inner blade 5 between the rotary inner blades 5 is applied to the rotary inner blade 5.

  According to the vibration mechanism of this form, for example, as shown in the figure, the rotary inner blade 5 rotates when the ten minute projections 29a and 29b are arranged on the left and right end surfaces 26a and 26b of the body portion 26, respectively. When making one rotation around the shaft 21, 10 reciprocating vibration forces can be applied to the rotary inner blade 5. In other words, compared with the vibration mechanism according to the conventional form described in Patent Document 1, it is possible to give the rotary inner blade 5 a vibration frequency 10 times higher. Thus, according to the rotary electric razor of the present invention, the rotary inner blade 5 reciprocates in the left-right direction in addition to the original scissor cutting function derived from the rotation of the rotary inner blade 5 around the rotation shaft 21. Since the pulling and cutting function derived from this can be obtained satisfactorily, the shaving efficiency of the electric razor and the sharpness can be greatly improved.

  Since the left and right microprotrusions 29a and 29b are alternately in contact with the guide pins 30a and 30b existing at the opposing positions, the reciprocating vibration force in the left and right direction is applied to the rotary inner blade 5, It is also superior in that the reciprocating vibration force can be reliably applied to the rotary inner blade as compared with the conventional embodiment in which the movement in the left-right direction is left to the urging force of the coil spring.

  In addition, this vibration mechanism is composed of minute protrusions 29a and 29b and guide pins 30a and 30b. The structure is simpler than that of the conventional vibration mechanism, and a special process for incorporating the mechanism is required. Since it is possible to assemble the electric razor in the same procedure as before, it is excellent in that a vibration mechanism can be provided to the electric razor without impairing productivity and cost.

  As shown in FIG. 3, when the minute protrusions 29 a and 29 b are seen from the left and right direction and are arranged over the entire circumference on the concentric position of the rotating shaft 21, the reciprocating vibration of the rotary inner blade 5 does not stop. This also makes it possible to improve the shaving efficiency and sharpness.

  As shown in FIGS. 6 and 7, the moving speed (v1) around the rotation shaft 21 at the tip of the cutting edge 27 and the amplitude moving speed (v2) in the left-right direction of the rotary inner blade 5 are set to substantially coincide. As a result, the cutting edge 27 can be displaced at an angle of approximately 45 ° (θ = 45 °) with respect to the front-rear direction so that the drawing and cutting function can be satisfactorily exhibited. This also contributes to the improvement of the shaving efficiency and sharpness of the electric razor.

For example, if the outer diameter of the rotary inner blade 5, that is, the outer diameter of the cutting blade 27 is 6.5 mm and the rotational speed of the rotary inner blade 5 is 3000 (rpm), the moving speed of the cutting blade 27 (v1 ) Is 612300 (mm / min), that is, (1021 mm / sec). The moving speed (v1) around the rotation axis 21 at the tip of the cutting blade 27 and the amplitude moving speed (v2) in the left-right direction of the rotary inner blade 5 are substantially matched, that is, (v1) = (v2). ) = 1021 (mm / sec), assuming that the height dimensions of the left and right microprojections 29a and 29b are the same, when the number of microprojections 29a and 29b is 10, Based on the calculation formula of 1021 / (10 × (3000/60) × 2)], a preferable projecting dimension of each of the fine protrusions 29a and 29b is about 1 (mm). That is, (v1) = (v2) can be obtained by setting each dimension value and the like as follows.
External dimensions of rotary inner blade 5: 6.5 mm
Number of rotations of rotary inner blade 5: 3000 rpm
Number of left and right microprojections 29a and 29b: 10 Projection dimension of microprojections 29a and 29b: 1 mm

  As shown in FIG. 8 and FIG. 9, when the rotation radius dimension around the rotation axis 21 of the minute projections 29a and 29b is set larger than the rotation radius dimension around the rotation axis 21 at the tip of the cutting blade 27, FIG. As shown in FIG. 3, it becomes easy to make the outer dimensions of the microprojections 29a and 29b in the circumferential direction around the rotation shaft 21 larger than that of the configuration shown in FIG. The cross-sectional outer shape (ridge line shape) in the circumferential direction can be made gentler than that of the fine protrusions 29a and 29b according to FIG. This reduces the impact load when the guide pins 30a and 30b or the minute projections 29a and 29b are in contact with each other and reduces the possibility that the guide pins 30a and 30b or the minute projections 29a and 29b are damaged or deformed. The occurrence of malfunction of the mechanism can be suppressed and the reliability of the rotary electric shaver can be improved.

  As shown in FIGS. 6 and 7, the left and right protrusion dimensions of the micro protrusions 29a and 29b are set to be larger than the maximum thickness dimension of 0.2 mm of the flange 32, and the left and right amplitude width is larger than the 0.2 mm. When the rotary inner blade 5 is configured to reciprocate, the cutting ability of the rotary inner blade 5 is satisfactorily exhibited, and the shaving efficiency and the sharpness can be improved.

(First embodiment)
1 to 7 show a first embodiment of the present invention. In FIG. 2, reference numeral 1 is a main body case, 2 is an outer blade held by the outer blade holder 3, and 5 is a rotary inner blade. The main body case 1 is a bottomed cylindrical plastic molded product that is open only at the upper surface, and includes a secondary battery 6 and a motor 7 therein. On the front outer side of the main body case 1, a switch button 9 for starting the motor, an indicator lamp 10 for displaying an operation state, and the like are provided.

  As shown in FIG. 1, a pair of left and right bearing walls 15, 15 that hold the rotary inner blade 5 rotatably through metal bushes 13 are provided on the left and right ends of the head case 12 that covers the output shaft 11 of the motor 7. It is installed. A reduction mechanism is provided inside the head case 12, and a winding conduction mechanism is provided on the left bearing wall. A conduction system that transmits the power of the motor 7 to the rotary inner blade 5 by using the reduction mechanism and the winding conduction mechanism. Configure. Specifically, the reduction mechanism includes a sun gear 16 fixed to the output shaft of the motor 7, a face gear 17 that meshes with the sun gear 16, and a reduction shaft 19 that is supported by the head case 12 and outputs the rotational power of the face gear 17. Etc. The winding conduction mechanism includes a driving pulley 20 fixed to the reduction shaft 19, a driven pulley 23 attached to the left end portion of the rotating shaft 21 of the rotary inner blade 5 via a metal bush 22, and both pulleys 20, 23. It is comprised with the endless belt 25 wound around.

  As shown in FIGS. 1 and 3, the rotary inner blade 5 is formed by insert-molding a plurality of spiral cutting blades 27 on the outer peripheral surface of a plastic cylindrical body portion 26. A rotating shaft 21 protrudes from the center of the left and right end faces of the portion 26. The left-right width dimension of the body 26 itself is set slightly smaller than the left-right facing distance dimension of the bearing walls 15, 15, and the rotary inner blade 5 can swing between the bearing walls 15, 15 in the left-right direction. It is supported by. As shown in FIG. 4, the shaft hole of the metal bush 22 and the left end portion of the rotating shaft 21 are formed in a non-circular cross section having a flat surface, so that the driven pulley 23 and the rotating shaft 21 are not relatively rotatable. , And are swingably connected in the left-right direction.

  In addition, it is noted that the electric razor according to the present embodiment includes a vibration mechanism that reciprocally vibrates the rotary inner blade 5 in the left-right direction. This vibration mechanism has a main body so as to sandwich a plurality of minute projections 29a and 29b integrally formed in the left-right direction and the rotary inner blade 5 from the left and right end faces 26a and 26b of the body portion 26. It consists of a pair of left and right guide pins 30a and 30b provided on the case 1 side. 1 and 3, reference numeral 29 a indicates a minute protrusion provided on the left end surface 26 a side of the body portion 26, and reference numeral 29 b indicates a minute protrusion provided on the right end surface 26 a of the body portion 26. . As shown in FIG. 3, each microprotrusion 29a, 29b has a hemispherical shape, and its projecting end is concentric with the rotation center of the rotating shaft 21, and the projecting end of the microprojection 29a on the left end face 26a side. And the protruding ends of the minute protrusions 29b on the right end surface 26b side are arranged so as to exist at staggered phase difference positions that do not overlap when seen through from the left and right directions. Moreover, the microprotrusions 29a and 29b are disposed over the entire circumference on a concentric position as seen through from the left-right direction. The protrusion dimensions in the left-right direction of the minute protrusions 29a and 29b are set to be larger than the maximum thickness dimension of 0.2 mm.

  As shown in FIG. 1, the guide pins 30 a and 30 b are provided oppositely in the middle in the vertical direction of the left and right inner surfaces of the bearing walls 15 and 15. As shown in FIG. 3, the guide pins 30a and 39b are formed in a vertically long shape that is long in the vertical direction. As shown in FIG. 5, the distance (d1) between the guide pins 30a and 30b in the left-right direction is set to be smaller than the width (d2) on the left and right sides of the body portion 26 including the minute protrusions 29a and 29b on the left and right sides. When the rotary inner blade 5 is rotated around the rotation shaft 21, the minute protrusions 29a and 29b come into contact with the guide pins 30a and 30b. The guide pins 30a and 30b are arranged at positions where they can come into contact with the minute protrusions 29a and 29b existing at the lowermost part.

  In the vibration mechanism having the above-described configuration, when the rotary inner blade 5 rotates around the rotation shaft 21 in response to the rotational power of the motor 7, the left and right micro-projections 29a and 29b are at the guide pins 30a A reciprocating vibration force that reciprocally moves the rotary inner blade 5 in the left-right direction between the guide pins 30a and 30b is applied. More specifically, when the rotary inner blade 5 is rotated in one direction from the posture state shown by the solid line in FIG. 5, the minute protrusion 29b positioned at the lowermost position on the right end face 26b side on the right guide pin 30b. As a result of the collision, the rotary inner blade 5 is displaced to the left posture as shown by the phantom line in FIG. When the rotary inner blade 5 is further rotated in the same direction, the minute projection 29a located at the lowermost portion on the left end face 26a side collides with the left guide pin 30a, and the rotary inner blade 5 is shown by a solid line in FIG. Return to the right posture. In other words, as the rotary inner blade 5 rotates, the minute projections 29a and 29b existing at the left and right lowermost portions alternately contact the opposing guide pins 30a and 30b in turn, thereby causing the rotary inner blade 5 to move to the left and right. A reciprocating vibration force for reciprocating in the direction is applied.

  As shown in FIG. 3, a total of ten minute protrusions 29 a and 29 b are arranged at equal intervals on each of the left and right end surfaces 26 a and 26 b of the body portion 26, and the rotary inner blade 5 is arranged around the rotation shaft 21. In one rotation, 10 reciprocating vibration forces are applied to the rotary inner blade 5. In other words, compared with the vibration mechanism according to the conventional form described in Patent Document 1, it is possible to give the rotary inner blade 5 a vibration frequency 10 times higher. Thus, according to the rotary electric razor of the present invention, the rotary inner blade 5 reciprocates in the left-right direction in addition to the original scissor cutting function derived from the rotation of the rotary inner blade 5 around the rotation shaft 21. Since the pulling and cutting function derived from this can be obtained satisfactorily, the shaving efficiency of the electric razor and the sharpness can be greatly improved. Since the microprotrusions 29a and 29b are arranged over the entire circumference, the reciprocating vibration of the rotary inner blade 5 does not cease and the shaving efficiency and the sharpness can be greatly improved.

  In addition, this vibration mechanism is composed of minute protrusions 29a and 29b and guide pins 30a and 30b. The structure is simpler than that of the conventional vibration mechanism, and a special process for incorporating the mechanism is required. Since it is possible to assemble the electric razor in the same procedure as before, it is excellent in that a vibration mechanism can be provided to the electric razor without impairing productivity and cost.

  In FIG. 6, reference numeral 31 denotes a shaving hole formed in the outer blade 2, and 32 denotes a scissors that have entered the shaving hole 31. Further, v1 indicates the vibration speed in the left-right direction of the rotary inner blade 5, and v2 indicates the rotation speed around the rotation shaft 21. In the present embodiment, the two speeds of the vibration movement speed v1 and the rotational speed v2 defined by the amplitude width in the left-right direction of the rotary inner blade 5 and the arrangement positions of the minute protrusions 29a and 29b are substantially the same speed. It is like that. According to this embodiment, the cutting blade 27 can be displaced at an angle of approximately 45 ° (θ = 45 °) with respect to the front-rear direction so that the drawing and cutting function can be satisfactorily performed. The shaving efficiency and sharpness of the electric razor can be greatly improved.

  Furthermore, in the present embodiment, as described above, the protrusion dimensions in the left-right direction of the minute protrusions 29a and 29b are set larger than the maximum thickness dimension of 0.2 mm of the flange 32, and the left and right protrusions larger than 0.2 mm are set. The rotary inner blade 5 is reciprocated with an amplitude width. This also contributes to improving the shaving efficiency and sharpness of the electric razor.

  FIG. 7 shows a modification of the first embodiment, in which only the point that the cutting edge 27 is straight is different from the previous first embodiment. Also according to the embodiment, the cutting blade 27 is displaced at an angle of approximately 45 ° (θ = 45 °) with respect to the front-rear direction so that the drawing / cutting function can be satisfactorily exhibited. Thereby, like the above-mentioned, the improvement of the drawing cutting ability of the rotary inner blade 5 can be aimed at, and the shaving efficiency and sharpness of an electric shaver can be improved.

(Second Embodiment)
8 to 10 show a rotary electric shaver according to the second embodiment of the present invention. In the present embodiment, as shown in FIG. 9, the rotation radius dimension around the rotation axis 21 of the minute protrusions 29 a and 29 b is made larger than the rotation radius dimension around the rotation axis 21 at the tip of the cutting edge 27. Specifically, disk-shaped flanges 33 and 33 having outer diameters larger than the rotational radius of the cutting blade 27 are formed on the outer sides of the body part 26 in the left-right direction, and the left and right sides of the flanges 33 and 33 are formed. A large number of minute projections 29a and 29b are provided along the outer peripheral edge of the outer side surface. Here, as in the first embodiment, ten minute protrusions 29a and 29b are arranged on the left and right, respectively, and when the rotary inner blade 5 makes one rotation around the rotation shaft 21, 10 reciprocating vibrations are performed. A force is applied to the rotary inner blade 5.

  In this way, when the rotation radius dimension around the rotation axis 21 of the microprojections 29a and 29b is larger than the rotation radius dimension around the rotation axis 21 at the tip of the cutting edge 27, as shown in FIG. The external dimensions of the microprojections 29a and 29b in the circumferential direction around the rotation axis 21 can be easily made larger than the external dimensions of the first embodiment, and therefore the cross-sectional external shape of the microprojections 29a and 29b in the circumferential direction ( (Ridge line shape) can be made gentler than that of the minute protrusions 29a and 29b according to the first embodiment. This reduces the impact load when the guide pins 30a and 30b or the minute projections 29a and 29b are in contact with each other and reduces the possibility that the guide pins 30a and 30b or the minute projections 29a and 29b are damaged or deformed. The occurrence of malfunction of the mechanism can be suppressed and the reliability of the rotary electric shaver can be improved.

  FIG. 11 shows a modified example of the second embodiment, in which the concave and convex portions having a corrugated cross section in which convex portions 35 and concave portions 36 are continuous along the circumferential direction on the left and right outer surfaces of the flanges 33 and 33. The protrusions 35 are formed as minute protrusions 29a and 29b that come into contact with the guide pins 30a and 30b. Thus, even when the concave and convex portions are provided on the flange 33, the cross-sectional outer shape (ridge line shape) in the circumferential direction of the minute protrusions 29a and 29b can be made smooth, so that the guide pins 30a and 30b or the minute protrusions 29a and 29b Since the impact load at the time of contact is reduced and the possibility that the guide pins 30a and 30b or the minute projections 29a and 29b are damaged or deformed can be reduced, the occurrence of malfunction of the vibration mechanism can be suppressed.

  The number of the fine protrusions 29a and 29b provided at the left and right positions of the rotary inner blade 5 is not limited to 10, and may be more or less.

The longitudinal front view of the principal part of the rotary-type electric shaver which concerns on 1st Embodiment of this invention. Overall front view of a rotary electric shaver AA line sectional view of FIG. BB sectional view of FIG. The figure for demonstrating operation | movement of the vibration mechanism of a rotary electric shaver The figure for demonstrating operation | movement of the vibration mechanism of a rotary electric shaver The figure which shows the modification of 1st Embodiment. The longitudinal front view of the principal part of the rotary electric shaver which concerns on 2nd Embodiment of this invention. CC sectional view of FIG. The figure for demonstrating operation | movement of the vibration mechanism of a rotary electric shaver The figure which shows the modification of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 5 Rotary inner blade 15 Bearing wall 21 Rotating shaft 26 Rotary inner blade trunk | drum 26a, 26b Left and right side surfaces 27 Rotary inner blade cutting edge 29a, 29b Minute protrusion 30a, 30b Guide pin

Claims (5)

A rotary type electric device provided with a vibration mechanism that reciprocally vibrates the rotary inner blade (5) supported on the upper portion of the main body case (1) in the left-right direction, which is the length direction of the rotary inner blade (5). A razor,
The rotary inner blade (5) is provided with a plurality of spiral or straight cutting blades (27) on the outer peripheral surface of a cylindrical body portion (26) having a rotating shaft (21). It is supported between a pair of left and right bearing walls (15, 15) provided on the case (1) side so as to be swingable in the left-right direction,
The vibration mechanism sandwiches a plurality of minute projections (29a, 29b) formed in a protruding shape in the left-right direction from the left and right end surfaces (26a, 26b) of the body portion (26) and the rotary inner blade (5). And a pair of left and right guide pins (30a, 30b) provided on the body case (1) side,
The microprojections (29a, 29b) have their projecting ends concentric with the rotation center of the rotating shaft (21), and the projecting ends and right end surfaces (26b) of the microprojections (29a) on the left end surface (26a) side. ) Side projections of the microprotrusions (29b) are arranged so as to be in staggered phase difference positions that do not overlap when seen through from the left and right directions,
The facing distance dimension (d1) of both guide pins (30a, 30b) is set smaller than the width dimension (d2) in the left-right direction of the body part (26) including the minute protrusions (29a, 29b),
When the rotary inner blade (5) is rotated around the rotation shaft (21), the left and right micro-projections (29a, 29b) are alternately in contact with the guide pins (30a, 30b) at the opposite positions. A rotary electric shaver characterized in that a reciprocating vibration force for reciprocating the rotary inner blade (5) between the guide pins (30a, 30b) is applied to the rotary inner blade (5).   The rotary electric shaver according to claim 1, wherein the microprojections (29a, 29b) are arranged over the entire circumference on a concentric position of the rotating shaft (21) as seen through from the left-right direction.   The moving speed (v1) around the rotation axis (21) at the tip of the cutting blade (27) is substantially equal to the amplitude moving speed (v2) in the left-right direction of the rotary inner blade (5). A rotary electric shaver according to 1 or 2.   The rotation radius dimension around the rotation axis (21) of the minute protrusions (29a, 29b) is set larger than the rotation radius dimension around the rotation axis (21) at the tip of the cutting blade (27). Or the rotary electric shaver of 3 description.   5. The rotary-type projection according to claim 1, 2, 3, or 4, wherein the protrusion dimension in the left-right direction of the microprotrusions (29 a, 29 b) is set to be larger than 0.2 mm, which is the maximum thickness dimension of the ridge (32). Electric razor.

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