JP5568367B2 - Electric razor - Google Patents

Description

  The present invention relates to a rotary electric shaver provided with a cutting blade that can be tilted and displaced while swinging around one axis.

  In a rotary electric shaver, for example, Patent Document 1 discloses that the cutting blade is tilted and displaced while swinging around one axis. There, the rotational power of the motor is transmitted to the pair of front and rear inner blades provided on the razor head via a gear transmission structure. The razor head is supported so that it can swing back and forth around the center axis of the final gear of the gear transmission structure, and the front and rear cutting blades can be tilted and displaced following changes in the skin surface. . Further, the entire motor and razor head are supported by an elastically deformable floating frame and a compression coil spring so that they can be displaced up and down.

  In the rotary electric shaver of Patent Document 2, one end of the inner blade is supported by a vertically movable bearing, the friction roller provided on the other end is supported by two friction rollers, and the inner blade is Supports subduction displacement. Specifically, a sun gear and a planetary gear are provided at the final stage of the gear transmission structure that transmits motor power, and the rotational power of the planetary gear is transmitted to the inner blade via a friction roller. A driving-side friction roller is fixed to the planetary gear shaft, and a driven-side friction roller is fixed to the inner blade shaft. In addition to these friction rollers, an auxiliary friction roller that circumscribes the driven friction roller is provided, and its roller shaft is guided by the case wall so that it can slide toward and away from the driven friction roller. It is approaching and energizing. The friction roller on the inner blade side sinks and displaces while increasing the distance between the friction roller on the driving side and the auxiliary friction roller. The displacement of the inner blade in this case is not exactly a tilt displacement that swings around one axis, but is an approximate displacement operation.

Japanese Patent Laid-Open No. 09-038351 (paragraph number 0031, FIG. 11) JP 07-11080 A (paragraph number 0016, FIG. 1)

  In the electric razor of Patent Document 1, the front and rear cutting blades can be tilted and displaced following the change of the skin surface. However, since the entire razor head is swung back and forth, the razor head cannot be tilted and displaced unless the reaction force from the skin surface (hereinafter simply referred to as skin reaction force) exceeds a certain level on the cutting blade. In addition, the skin contact at the time of cutting the beard is heavy, and the tilting operation of the cutting blade when following the change in the skin surface tends to become dull.

  Further, in the electric razor of Patent Document 2, one end of the inner blade is supported by a bearing that is elastically supported so as to freely move up and down, and the other end is supported by two friction rollers. Therefore, the bearing and two friction rollers are supported. It is difficult to sunk evenly, and the outer blade may not be able to adhere to the inner blade. Therefore, when cutting a whisker while tilting, the sharpness of the cutting blade tends to decrease.

An object of the present invention is to provide an electric razor that can follow a change in the skin surface while tilting and displacing the cutting blade unit with a smaller skin reaction force, and thus can perform beard cutting lightly.
An object of the present invention is to provide an electric razor that can raise a beard by raising the skin surface with a tilting cutting blade unit, and thus can effectively cut the beard.

  In the electric razor according to the present invention, the cutting blade unit 11 provided in the razor head 2 includes an outer blade 23, a rotary inner blade 24, and a tilting frame 25 that supports both the blades 23 and 24. A transmission structure for transmitting the rotational power of the motor 15 to the inner blade is provided between the motor 15 and the inner blade 24. The inner blade 24 is disposed on either one of the front and rear sides of the upper half of the sun gear 60 provided at the final stage of the transmission structure, and is driven to rotate by the sun gear 60. The tilt frame 25 has an axis that coincides with the axis of the sun gear 60 so that the tilt frame 25 can tilt between an upper standby position and a tilt position below the standby position. The cutting blade unit 11 is urged to move toward the standby position by the return spring 26.

  First and second cutting blade units 11 and 12 are provided at least before and after the razor head 2. The first cutting blade unit 11 includes an outer blade 23, a rotary inner blade 24, and a tilt frame 25 that supports both the blades 23 and 24. The inner blades 24 and 40 of the first and second cutting blade units 11 and 12 are arranged before and after the upper half of the sun gear 60 and are driven to rotate by the sun gear 60. As shown in FIG. 7, the tilting operation of the first cutting blade unit 11 increases the distance between the two cutting blade units 11 and 12 so as to pull the skin surface.

  As shown in FIG. 5, the rotational moment of the sun gear 60 and the biasing direction of the return spring 26 are matched, and the return operation of the first cutting blade unit 11 by the return spring 26 is performed with the rotational moment of the sun gear 60. Assist.

  First and second cutting blade units 11 and 12 are provided at least before and after the razor head 2. The diameters of the inner blades 24 and 40 of the first and second cutting blade units 11 and 12 are made different in size.

  The peripheral speed of the inner blade 24 having a small diameter is set to be equal to or smaller than the peripheral speed of the inner blade 40 having a large diameter. The driving rotational speed of the inner blade 40 having a large diameter is set smaller than the driving rotational speed of the inner blade 24 having a small diameter.

  First and second cutting blade units 11 and 12 are provided at least before and after the razor head 2. The diameters of the inner blades 24 and 40 of the first and second cutting blade units 11 and 12 are made different in size. The first cutting blade unit 11 including the inner blade 24 having a small diameter is supported so as to be able to tilt around an axis that coincides with the axis of the sun gear 60. In this case, the second cutting blade unit 12 may have either a structure that cannot float vertically or a structure that can float vertically. In the latter case, the spring pressure of the float spring 21 is set to the spring pressure of the return spring 71. Set a larger value.

  A third cutting blade unit 13 including an outer blade 46 having a slit blade structure and a rotary inner blade 47 is provided between the first and second cutting blade units 11 and 12. The inner blade 47 of the third cutting blade unit 13 is rotationally driven via a small gear 60 b that rotates together with the sun gear 60 and an inner blade gear 63.

  As shown in FIG. 3, the razor head 2 is supported by the main body 1 serving also as a grip through a floating structure so that it can float up and down. Accordingly, the first cutting blade unit 11 can be tilted and displaced with respect to the razor head 2, and the razor head 2 can float up and down with respect to the main body 1.

  The floating structure includes a float spring 21 that pushes up and biases the razor head 2. The biasing force of the return spring 26 of the first cutting blade unit 11 is set to be smaller than the biasing force of the floating spring 21 having a floating structure.

  The top of the first cutting blade unit 11 in the standby position is positioned above the top of the second cutting blade unit 12. Thereby, the first cutting blade unit 11 can be tilted ahead of the other cutting blade units 12 and 13 at the time of beard cutting.

  In the present invention, the cutting blade unit 11 is configured by supporting the outer blade 23 and the inner blade 24 with a tilting frame 25, and the tilting frame 25 is pivotally supported around an axis that coincides with the axis of the sun gear 60. The inner blade 24 that is tilted and displaced can be rotationally driven by the sun gear 60. Further, the cutting blade unit 11 can be automatically returned to the standby position by the return spring 26. In this manner, when the cutting blade unit 11 that can be tilted independently is provided on the razor head 2, the cutting blade unit 11 is tilted and displaced with a smaller skin reaction force than a conventional electric razor that tilts the entire razor head. It is possible to smoothly follow changes in the skin surface. Therefore, beard cutting can be performed easily.

  When the first and second cutting blade units 11 and 12 are arranged before and after the upper half of the sun gear 60, the axis of the sun gear 60 due to its own weight and the first cutting blade unit 11 supported to be tiltable A tilting moment around the corresponding axis can always be applied. The first cutting blade unit 11 in the standby position is held in position against the previous tilting moment by the spring force of the return spring 26, but resists the spring force of the return spring 26 when a skin reaction force acts. To tilt. The tilting moment of the first cutting blade unit 11 at this time increases as the angle of tilting from the standby position increases. This is because the moment arm of the first cutting blade unit 11 increases as the tilt angle increases. Therefore, the increase in the spring force of the return spring 26 when the first cutting blade unit 11 tilts can be reduced by increasing the tilting moment, and the skin reaction force in the process of tilting the first cutting blade unit 11 is reduced. The cutting blade unit 11 can be tilted and displaced with a smaller skin reaction force. In addition, since the skin reaction force at the time of cutting the beard is small, the stimulation on the skin surface is reduced and the beard cutting can be performed more lightly.

  Since the first and second cutting blade units 11 and 12 are arranged before and after the sun gear 60, the first cutting blade unit 11 is tilted about the axis that coincides with the axis of the sun gear 60. When the 1 cutting blade unit 11 tilts, the space | interval of both the cutting blade units 11 * 12 can be expanded, and the skin surface can be pulled and extended. Specifically, the first cutting blade unit 11 at the time of beard cutting tilts away from the second cutting blade unit 12, but at this time, the skin surface between the two cutting blade units 11 and 12 is pulled to It is possible to raise hairs and long hairs that fall over. Therefore, the brushed hair can be effectively cut with either of the cutting blade units 11 and 12.

  When the direction of the rotational moment of the sun gear 60 is made to coincide with the biasing direction of the tilting frame 25 by the return spring 26, the return operation of the first cutting blade unit 11 by the return spring 26 can be assisted by the previous rotational moment. it can. As a result, the spring pressure of the return spring 26 can be reduced by the amount of the return force generated by the rotational moment of the sun gear 60. Therefore, the first cutting blade unit 11 can be tilted more easily with a smaller force. .

  When the diameters of the inner blades 24 and 40 of the first and second cutting blade units 11 and 12 provided before and after the razor head 2 are made different in size, the skin of the cutting blade unit 12 provided with the inner blade 40 having a large diameter. The contact area with the surface can be increased, and shaving can be effectively performed in a shorter amount of time. Moreover, the cutting blade unit 11 provided with the inner blade 24 with a small diameter tends to increase the skin reaction force by the amount of contact area with the skin surface, and can finish and shave short hair. Accordingly, the first and second cutting blade units 11 and 12 can perform rough shaving and finishing shaving in cooperation, and can effectively perform beard cutting in a shorter time.

  When the peripheral speed of the inner cutter 24 with a small diameter is set to be equal to or smaller than the peripheral speed of the inner cutter 40 with a large diameter, the number of times the small cutter of the inner cutter 24 with a small diameter contacts the skin surface, and scraping The amount on the skin can be reduced by reducing the amount. Further, the inner blade 40 having a large diameter has a large contact area with the skin surface, so that a larger amount of whiskers can be cut simultaneously, but a larger driving torque is required. In order to ensure this driving torque, the rotational speed of the inner blade 40 having a large diameter is set to be larger than the rotational speed of the inner blade 24 having a small diameter. Furthermore, the burden on the skin can be alleviated by cutting the beard powerfully as much as the driving torque of the inner blade 40 is large.

  As described above, in the first cutting blade unit 11 including the inner blade 24 having a small diameter, the skin reaction force acts more strongly than the other cutting blade units 12, and the skin is placed inside the outer blade 23. Easy to sag. For this reason, there is a tendency that the skin irritation is increased and the tingling sensation tends to be given. However, if the first cutting blade unit 11 is supported so that it can be tilted about an axis that coincides with the axis of the sun gear 60, the first cutting blade unit is sensitively adapted to a slight change in the skin reaction force. Since 11 can be tilted, it is possible to avoid excessive pressing of the skin surface.

  When the third cutting blade unit 13 is provided between the first and second cutting blade units 11 and 12 and the inner blade 47 is rotationally driven via the sun gear 60 or the inner blade gear 63, the cutting blade units 11 to 11 are provided. 13 can be collectively driven by a gear transmission structure provided on one side of the razor head 2. Therefore, the lower space of each of the cutting blade units 11 to 13 can be completely opened, and the removal of fuzz can be performed more easily. For example, when the third cutting blade unit 13 includes the reciprocating inner blade 47, at least the lower space of the third cutting blade unit 13 is occupied by the inner blade driving structure, and the hair is formed on the surface thereof. It is inevitable that scraps are attached, and a lot of trouble is required for cleaning. Further, as described above, the tilting first cutting blade unit 11 pulls the skin surface and can raise comb hairs and long hairs that have fallen into the skin surface. The third cutting blade unit 13 provided therebetween can be effectively cut.

  If the razor head 2 is supported by the main body 1 that also serves as a grip so that it can float up and down, the first cutting blade unit 11 can be tilted and displaced, and at the same time, the razor head 2 can float up and down with respect to the main body 1. . Therefore, the user can cut the whiskers while tilting the first cutting blade unit 11 or tilting the first cutting blade unit 11 and further floating the razor head 2 up and down, Various pressing forces against the skin surface when cutting the beard can be selected.

  When the biasing force of the return spring 26 of the first cutting blade unit 11 is set to be smaller than the biasing force of the float spring 21 having a floating structure, the spring pressure of the return spring 26 exceeds a certain value due to the tilting of the first cutting blade unit 11. The razor head 2 can be prevented from floating up and down. Therefore, whisker cutting can be performed accurately while the first cutting blade unit 11 is tilted while preventing the razor head 2 from floating up and down unnecessarily during whisker cutting. Further, in a situation where the second cutting blade unit 12 is strongly pressed against the skin surface, the razor head 2 is floated up and down to prevent the skin surface from being excessively stimulated, and the burden on the skin surface can be alleviated.

  When the top of the first cutting blade unit 11 in the standby position is positioned above the top of the second cutting blade unit 12, the first cutting blade unit 11 is first preceded by the other cutting blade units 12 and 13 during whiskers cutting. Then, it can be pressed against the skin surface and the beard can be cut with the skin surface stretched. Therefore, the skin beard stretched by the first cutting blade unit 11 is simultaneously cut by the plurality of cutting blade units 11, 12, and 13 so that the shaving operation can be efficiently performed in a short time.

It is a vertical side view of the cutting blade unit concerning the present invention. It is a front view of an electric razor. It is a vertical front view which shows the floating support structure of a razor head. It is a top view of a cutting blade unit. It is a vertical side view which shows a gear transmission structure. It is a disassembled perspective view of the inner blade comprised with the slit blade. It is operation | movement explanatory drawing which shows the state of the cutting blade unit at the time of a beard cutting. It is a vertical side view which shows another Example of a cutting blade unit. It is a side view which shows the gear transmission structure of the cutting blade unit of FIG. It is a vertical side view which shows another Example of a cutting blade unit. It is a vertical side view which shows another Example of a cutting blade unit. It is a vertical front view which shows another Example of a transmission structure.

(Example) FIG. 1 thru | or FIG. 7 shows the Example of the rotary electric shaver which concerns on this invention. In the present invention, “front / rear”, “left / right”, and “upper / lower” refer to the cross arrows shown in FIG. 1 and FIG. In FIG. 2, the rotary electric razor includes a main body 1 that also serves as a grip, and a razor head 2 that is supported by the main body 1 through a floating structure so that it can float up and down. A switch button 3 for starting the motor, a select button 4 for switching the operation state of the motor, and an LED display unit 5 are provided on the front surface of the main body 1. The main body 1 contains a secondary battery 6 and a circuit board on which components constituting a control circuit are mounted.

  The razor head 2 has a structure including a head base 8, a gear cover 9 fixed to the upper surface thereof, a cutting blade base 10, a motor holder 14 fixed to the lower surface of the head base 8, and the like. The first to third cutting blade units 11, 12, 13 are arranged on the upper part of the cutting blade base 10, and these cutting blade units 11, 12, 13 and a motor provided inside the motor holder 14 A gear transmission structure (transmission structure) is disposed between the gears 15 and 15. As shown in FIG. 5, the first and second cutting blade units 11 and 12 are arranged in front of and behind the upper half of the sun gear 60, and the third cutting blade unit 13 is interposed between these units 11 and 12. It is arranged. The cutting blade base 10 is composed of a base body 10a and a side frame 10b fixed to the right end of the base body 10a (see FIG. 3).

  As shown in FIG. 3, a floating structure for floatingly supporting the razor head 2 is provided between the motor holder 14 and the inner case 18 inside the main body 1. The floating structure is arranged between the inner case 18 and the motor holder 14, the slide groove 19 provided on the opposing wall of the inner case 18, and the projection 20 of the motor holder 14 slidably guided by the slide groove 19. It is composed of a float spring 21 and the like. Thus, when the razor head 2 is supported by a floating structure so as to float freely, the razor head 2 is floated up and down according to the skin reaction force acting on each of the cutting blade units 11 to 13 when cutting the beard. Can be displaced.

  The first cutting blade unit (cutting blade unit) 11 includes an outer blade 23 made of a mesh blade, a rotary inner blade 24, a tilting frame 25 that supports both of them, a return spring 26, and the like. It is arranged at the front of the razor head 2 (see FIG. 1). The tilt frame 25 is integrally provided with a pair of left and right side walls 28, a pair of front and rear walls 29 that connect them, and a bottom wall 30, and bearing portions 31 project rearward on both side walls 28.

  By supporting the bearing portion 31 with a sun gear shaft 65 and a tilting shaft 66, which will be described later, the first cutting blade unit 11 is located between a standby position indicated by a solid line in FIG. 1 and a tilting position indicated by an imaginary line. Can tilt. In order to tilt the tilting frame 25 in a more stable state, a swing pin 32 protruding from the outer surface of the side wall 28 and an inner blade shaft 37 pivotally supported by the side wall 28 are provided on the left and right side walls of the cutting blade base 10. The guide groove 33 guides. The tilt limit of the tilt frame 25 is defined by the swing pin 32, the inner blade shaft 37 and the guide groove 33. The tilting shaft 66 is provided on the central axis of the sun gear shaft 65 and is fixed to the left side wall of the cutting blade base 10 (see FIG. 3). The return spring 26 is a torsion coil spring, one end of which is received by the spring receiving recess 16 of the cutting blade base 10, and the other end is received by the spring receiving recess 34 of the bottom wall 30 of the tilt frame 25. The urging force of the return spring 26 is set to be smaller than the urging force of the float spring 21 having the previous floating structure.

  As shown in FIG. 6, the inner blade 24 is formed in a cylindrical shape by three disk-shaped holder frames 35 and three blade bodies 36 fixed around the holder frame 35. The inner blade shaft 37 is fixed. The blade body 36 having a slit blade structure is formed by electroforming. As shown in FIG. 3, both ends of the inner blade shaft 37 are rotatably supported by the left and right side walls 28 of the tilting frame 25. The lower ends of the front and rear surfaces of the outer blade 23 are supported by front and rear walls 29 of the tilting frame 25, and are pulled and biased by a tension structure (not shown) (see FIG. 1). The blade 23 can be always kept in close contact with the inner blade 24. The first cutting blade unit 11 further shaves the short hair after being cut by the second cutting blade unit 12 to perform a finish shaving.

  The second cutting blade unit (cutting blade unit) 12 includes an outer blade 39 made of a mesh blade, a slit blade-shaped inner blade 40, an inner blade shaft 41 arranged at the center thereof, and the like. The razor head 2 is arranged in parallel with the first cutting blade unit 11 at the rear part. The inner blade 40 is configured in the same manner as the inner blade 24 of the first cutting blade unit 11, but both ends of the inner blade shaft 41 are rotatably supported by the base body 10 a and the side frame 10 b of the cutting blade base 10. This is different from the inner blade 24 of the first cutting blade unit 11. The first and second cutting blade units 11 and 12 are mainly configured as cutting blade units for cutting short hairs.

  That is, the second cutting blade unit 12 can float up and down together with the razor head 2, but cannot tilt alone or float up and down alone. Further, the diameter dimension of the inner blade 40 of the second cutting blade unit 12 is set larger than the diameter of the inner blade 24 of the first cutting blade unit 11. The lower ends of the front and rear surfaces of the outer blade 39 are supported by a central wall 43 and a rear wall 44 provided on the base body 10a of the cutting blade base 10, and are tensioned and biased by a tension structure (not shown). The outer cutter 39 retained in the shape can be always kept in close contact with the inner cutter 40. The second cutting blade unit 12 mainly shaves short hairs.

  As described above, when the diameter of the inner blade 24 of the first cutting blade unit 11 is smaller than the diameter of the inner blade 40 of the second cutting blade unit 12, a large amount of whiskers are introduced into the second cutting blade unit 12 having a large surface area. Thus, shaving can be performed effectively in a short time. Since the first cutting blade unit 11 has a smaller diameter of the inner blade 24 than the second cutting blade unit 12, pressure is easily applied to the skin surface accordingly. Therefore, the skin reaction force acts more strongly than the other cutting blade units 12 and 13, the skin tends to sag inside the outer blade 23, and the skin irritation tends to increase. A tingling sensation is likely to occur. In order to relieve such irritation to the skin surface, the first cutting blade unit 11 is supported so as to be tilted to eliminate excessive pressure acting on the skin surface.

  As shown in FIG. 1, the top portion of the first cutting blade unit 11 at the standby position protrudes upward from the top portion of the second cutting blade unit 12 by the dimension H. In addition, since the inner blade 24 of the first cutting blade unit 11 is positioned obliquely above the sun gear shaft 65, a tilting moment due to gravity can always be applied to the first cutting blade unit 11. Therefore, the first cutting blade unit 11 can be brought into contact with the skin surface prior to the other cutting blade units 12 and 13 during beard cutting, and can be tilted lightly by the tilting moment.

  Incidentally, when the first cutting blade unit 11 tilts from the standby position, the moment arm increases as the tilt angle increases, and the tilt moment increases accordingly. Therefore, the increase in the spring force of the return spring 26 when the first cutting blade unit 11 tilts can be reduced by increasing the tilting moment, and the skin reaction force in the process of tilting the first cutting blade unit 11 is reduced. The cutting blade unit 11 can be tilted and displaced with a smaller skin reaction force. Further, as shown in FIG. 7, after the second cutting blade unit 12 presses the skin surface, the first cutting blade unit 11 tilts to increase the distance between the two cutting blade units 11 and 12. You can pull the surface. Therefore, the comb hair and long hair falling on the skin surface can be raised, and the raised beard can be effectively cut by the third cutting blade unit 13.

  The third cutting blade unit 13 (cutting blade unit) is disposed between the first and second cutting blade units 11 and 12 in parallel with the cutting blade units 11 and 12. The top of the third cutting blade unit 13 is positioned below the top of the second cutting blade unit 12. The third cutting blade unit 13 includes an outer blade 46, a slit blade-shaped inner blade 47, an inner blade shaft 48 disposed at the center thereof, and the like, and uses the outer blade 46 having a slit blade structure. However, it differs from the previous cutting blade units 11 and 12. The 3rd cutting blade unit 13 is comprised as a cutting blade unit for mainly cutting | disconnecting long hair and a comb hair.

  The diameter of the inner blade 47 is set to be smaller than the diameter of the inner blade 24 of the first cutting blade unit 11. The inner blade 40 is configured in the same manner as the inner blade 24 of the first cutting blade unit 11, but the inner blade shaft 41 is rotatably supported by the base body 10 a and the side frame 10 b of the cutting blade base 10. A certain point is different from the inner blade 24 of the first cutting blade unit 11. The lower ends of the front and rear surfaces of the outer blade 46 are supported by the auxiliary wall 49 provided in the base body 10a and the central wall 43 described above, and are pulled and urged by a tension structure (not shown). The outer blade 46 retained in the shape can be always kept in close contact with the inner blade 47. The third cutting blade unit 13 mainly cuts long hairs and comb hairs.

  3 and 5, the gear transmission structure is constituted by a gear group arranged along the outer surface of the side frame of the cutting blade base 10 from the upper surface of the head base 8. The rotation is converted to rotation around the intermediate shaft 50 and transmitted to the inner blades 24, 40 and 47. Specifically, the rotational power of the motor 15 is transmitted to the intermediate shaft 50 via a first gear 51, a second gear 52, and a third gear 53 and a fourth gear 54 each formed of a bevel gear. Further, the rotational power of the fifth gear 55 fixed to the side end of the intermediate shaft 50 is transmitted to the sun gear 60 provided at the final stage of the gear group via the sixth gear 56 and the seventh gear 57. Further, the rotational power of the sun gear 60 is transmitted to the inner blade gears 61, 62, 63 fixed to the inner blade shafts 37, 41, 48, and the inner blades 24, 40, 47 are simultaneously rotated.

  The sixth gear 56 and the sun gear 60 are integrally provided with large gears 56a and 60a and small gears 56b and 60b, respectively. The large gear 56a of the sixth gear 56 meshes with the fifth gear 55, and the small gear 56b. Meshes with the seventh gear 57. The large gear 60 a of the sun gear 60 is simultaneously meshed with the seventh gear 57, the inner blade gear 61 of the first cutting blade unit 11, and the inner blade gear 62 of the second cutting blade unit 12. The gear 60 b meshes with the inner blade gear 63 of the third cutting blade unit 13.

  The rotation directions of the sun gear 60 and the inner blade gears 61, 62, and 63 are as indicated by arrows in FIG. 5, and the rotation moment of the sun gear 60 and the biasing direction of the return spring 26 are made to coincide. Thereby, the return moment of the first cutting blade unit 11 by the return spring 26 can be assisted by the rotational moment of the sun gear 60, and the spring pressure of the return spring 26 is reduced by that much, and the first cutting blade unit. 11 can be tilted lightly with a smaller force. The outer surface of the gear group from the fifth gear 55 to the inner blade gears 61 to 63 is covered with a cover 68. Similarly, the left side surface of the base body 10 a is also covered with the cover 68.

  By adjusting the gear ratio between the sun gear 60 and the inner blade gears 61, 62, and 63, the peripheral speed of each of the inner blades 24, 40, and 47 and the driving rotational speed are set as follows. When the peripheral speed of the inner blade 24 of the first cutting blade unit 11 is 0.92 m / s and the driving rotational speed of the inner blade 24 is 2700 rpm, the peripheral speed of the inner blade 40 of the second cutting blade unit 12 is 1. The rotational speed of the inner blade 40 is 2300 rpm. Further, the peripheral speed of the inner blade 47 of the third cutting blade unit 13 is 0.63 m / s, and the driving rotational speed of the inner blade 47 is 2400 rpm.

  As described above, when the peripheral speed of the inner blade 24 is made smaller than the peripheral speed of the inner blade 40, the number of times the small blade of the inner blade 24 having a small diameter contacts the skin surface and the amount of rubbing are reduced, thereby reducing the skin surface. Can alleviate the burden. Further, the inner blade 40 having a large diameter has a large contact area with the skin surface, so that a larger amount of whiskers can be cut simultaneously, but a larger driving torque is required. In order to ensure this driving torque, the driving rotational speed of the inner blade 40 having a large diameter is set smaller than the driving rotational speed of the inner blade 24 having a small diameter.

  In the electric shaver configured as described above, the entire first cutting blade unit 11 is equal to the diameter of the inner blade 24 of the first cutting blade unit 11 smaller than the diameter of the inner blade 40 of the second cutting blade unit 12. The weight can be made smaller than the total weight of the second cutting blade unit 12. Therefore, the first cutting blade unit 11 can be held at the standby position with the return spring 26 having a smaller spring pressure. Further, the first cutting blade unit 11 is tilted about an axis that coincides with the axis of the sun gear 60, and the inner blade 24 of the first cutting blade unit 11 is positioned in front of the upper half of the sun gear 60. Therefore, a tilting moment due to gravity can always be applied to the first cutting blade unit 11. Therefore, at the time of use, the 1st cutting blade unit 11 can be tilted lightly with a smaller skin reaction force. Moreover, the irritation | stimulation with respect to the skin surface can be reduced by the part which can make the pressing force with respect to skin small.

  The electric shaver configured as described above can be implemented in the following form.

  The cutting blade unit 11 provided on the razor head 2 includes an outer blade 23, a rotary inner blade 24, and a tilt frame 25 that supports both the blades 23 and 24. A gear transmission structure is provided between the motor 15 and the inner blade 24 to transmit the rotational power of the motor 15 to the inner blade. The inner blade 24 is disposed on either one of the front and rear sides of the upper half of the sun gear 60 provided at the final stage of the gear transmission structure, and is driven to rotate by the sun gear 60. The tilt frame 25 is pivotally supported about an axis that coincides with the axis of the sun gear 60 so that the tilt frame 25 can tilt between an upper standby position and a tilt position below the standby position. The cutting blade unit 11 is urged to move toward the standby position by the return spring 26.

  First and second cutting blade units 11 and 12 are provided at least before and after the razor head 2. The first cutting blade unit 11 includes an outer blade 23, a rotary inner blade 24, and a tilt frame 25 that supports both the blades 23 and 24. The tilting frame 25 is pivotally supported around an axis that coincides with the axis of the sun gear 60. By the tilting operation of the first cutting blade unit 11, the skin surface between the two cutting blade units 11, 12 is pulled to raise.

  The rotational moment of the sun gear 60 and the biasing direction of the return spring 26 are matched, and the return moment of the first cutting blade unit 11 by the return spring 26 is assisted by the rotational moment of the sun gear 60.

  First and second cutting blade units 11 and 12 are provided at least before and after the razor head 2. The diameters of the inner blades 24 and 40 of the first and second cutting blade units 11 and 12 are made different in size.

  When the peripheral speed of the inner blade 24 of the first cutting blade unit 11 is V1, and the peripheral speed of the inner blade 40 of the second cutting blade unit 12 is V2, (V1 ≦ V2). Further, when the driving rotational speed of the blade 24 of the first cutting blade unit 11 is N1, and the driving rotational speed of the blade 40 of the second cutting blade unit 12 is N2, (N1> N2).

  8 and 9 show another embodiment of the cutting blade unit according to the present invention. In this case, the second cutting blade unit 12 is supported by the tilting frame 70 in the same manner as the first cutting blade unit 11 so that it can be tilted around the sun gear shaft 65 and the tilting shaft 66, and the return spring 71 is set at the standby position. Returned to the direction. Since both the first and second cutting blade units 11 and 12 are arranged before and after the sun gear 60 and the sun gear shaft 65 and the tilt shaft 66 are used as the tilt center axis common to both the units 11 and 12, the second The cutting blade unit 12 tilts in the clockwise direction opposite to the first cutting blade unit 11. The spring force of the return spring 26 of the first cutting blade unit 11 is set to be smaller than the spring force of the return spring 71 of the second cutting blade unit 12, and therefore, the first cutting blade unit 11 at the time of cutting the whiskers You can gently touch the skin.

  The tilt frame 70 is integrally provided with a pair of left and right side walls 74, a pair of front and rear walls 75 that connect them, and a bottom wall 76, and bearing parts 77 that are pivotally supported by the sun gear shaft 65 on both side walls 74. Projecting forward. A swing pin 78 projects from the outer surface of the side wall 74 of the tilt frame 70, and the pin 78 and the inner blade shaft 41 pivotally supported by the side wall 74 are provided on the left and right side walls of the cutting blade base 10. Guided by a groove 79. The tilt limit of the tilt frame 70 is defined by the swing pin 78, the inner blade shaft 41 and the guide groove 79. The drive structure of the inner blade 24 of the first cutting blade unit 11 and the inner blade 40 of the second cutting blade unit 12 is basically the same as that of the previous embodiment, but as shown in FIG. The difference is that the rotational power is transmitted to the inner blade gears 61 and 62 via the final gears 80 and 80 provided on the side wall 28 of the tilting frame 25. Thus, the rotational power of the sun gear 60 can be transmitted to the inner blade gears 61 and 62 via one or more final gears 80 and 80. Since others are the same as the previous embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted. The same applies to the following embodiments.

  FIG. 10 shows still another embodiment of the cutting blade unit according to the present invention. In this case, the first cutting blade unit 11 and the reciprocating second cutting blade unit 12 are provided before and after the razor head 2, which is different from the previous embodiment. The second cutting blade unit 12 includes an outer blade 81 formed of a slit blade and an inner blade 82 provided with a group of small blades. In order to drive the inner blade 82, an eccentric pin 84 is provided in the branch gear 83 that meshes with the second gear 52, and the drive shaft 85 is reciprocated left and right by the eccentric pin 84, and the converted reciprocating power is transmitted to the inner blade 82. I tried to do it. The branch gear 83, the eccentric pin 84, and the drive shaft 85 constitute an operation conversion structure.

  FIG. 11 shows still another embodiment of the cutting blade unit according to the present invention. There, the first cutting blade unit 11 and the second cutting blade unit 12 are arranged before and after the razor head 2, and the reciprocating third cutting blade unit 13 is arranged between the units 11 and 12. The third cutting blade unit 13 is composed of an outer blade 91 formed of a slit blade and an inner blade 92 having a group of small blades, and uses the same motion conversion structure as described in FIG. The inner blade 92 was reciprocated by the drive shaft 93 after conversion. The inner blade gear 62 of the second cutting blade unit 12 is driven by an eighth gear 58 that meshes with the seventh gear 57.

  The transmission structure does not need to be a gear transmission structure, and the rotational power of the motor 15 can be transmitted to the sun gear 60 by the winding transmission structure (transmission structure). For example, as shown in FIG. 12, timing pulleys 89 and 90 are fixed to the output shaft 88 of the motor 15 and the sun gear shaft 65, respectively, and a timing belt 94 is wound around both of them to drive the motor power to the sun gear shaft 65. Can be transmitted directly.

  In the embodiment shown in FIGS. 1 to 7, the tilting frame 25 is supported by the sun gear shaft 65 and the tilting shaft 66, but this is not necessary, and one or two supports provided on the central axis of the sun gear 60. The tilting frame 25 can be supported by the shaft. In this case, the support shaft may be integral with the sun gear shaft 65 or may be a separate body. Further, the left and right bearing portions 31 of the tilting frame 25 can be integrally provided with shafts corresponding to the previous support shafts, and these shafts can be supported by bearing holes formed in the side frames 10a and 10b. The point is that the tilting frame 25 only needs to be supported around an axis that coincides with the axis of the sun gear 60, and the support structure is not limited.

  The inner blades 24, 40, and 47 do not need to be formed by cylindrical slit blades, and are constituted by spiral blades in which a plurality of small blades are fixed in a spiral shape on the peripheral surface of a plastic-molded round shaft holder. can do. The razor head 2 does not need to be supported by the main body 1 so as to be floatable up and down, and may be an electric razor in which the razor head 2 is fixedly supported by the main body 1. The razor head 2 may be an electric razor supported by the main body 1 so as to be tiltable.

DESCRIPTION OF SYMBOLS 1 Main-body part 2 Razor head 8 Head base 9 Gear cover 10 Cutting blade base 11 1st cutting blade unit 12 2nd cutting blade unit 13 3rd cutting blade unit 15 Motor 23/39 Outer blade 24/40 Inner blade 25 Tilt frame 26 Return Spring 60 Sun gear 61/62 Inner blade gear 65 Sun gear shaft

Claims (4)

The cutting blade unit (11) provided on the razor head (2) includes an outer blade (23), a rotary inner blade (24), and a tilting frame (25) that supports both (23, 24). And
A transmission structure is provided between the motor (15) and the inner blade (24) to transmit the rotational power of the motor (15) to the inner blade.
The inner blade (24) is disposed on one of the front and rear sides of the upper half of the sun gear (60) provided at the final stage of the transmission structure, and is driven to rotate by the sun gear (60).
The tilt frame (25) has an axis that coincides with the axis of the sun gear (60) so that it can tilt between an upper standby position and a tilt position below the standby position,
The cutting blade unit (11) is Ri biases moving Thea toward the standby position by the return spring (26),
First and second cutting blade units (11, 12) are provided at least before and after the razor head (2),
The first cutting blade unit (11) includes an outer blade (23), a rotary inner blade (24), and a tilting frame (25) that supports both (23, 24).
Inner blades (24, 40) of the first and second cutting blade units (11, 12) are arranged before and after the upper half of the sun gear (60) and are driven to rotate by the sun gear (60). ,
An electric razor characterized in that, by tilting the first cutting blade unit (11), the distance between the two cutting blade units (11, 12) is increased to pull the skin surface . The rotational moment of the sun gear (60) and the biasing direction of the return spring (26) are made to coincide with each other, and the rotational moment of the sun gear (60) causes the first cutting blade unit (11) of the first spring blade (26) to move. The electric shaver according to claim 1 , wherein the electric shaver assists a returning operation . First and second cutting blade units (11, 12) are provided at least before and after the razor head (2),
The electric shaver according to claim 1 or 2, wherein the diameters of the inner blades (24, 40) of the first and second cutting blade units (11, 12) are varied in size. The peripheral speed of the inner blade (24) having a small diameter is set to be equal to or smaller than the peripheral speed of the inner blade (40) having a large diameter,
The electric shaver according to claim 3 , wherein the driving rotational speed of the inner blade (40) having a large diameter is set smaller than the driving rotational speed of the inner blade (24) having a small diameter .

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