JP4845093B2 - Cutting device - Google Patents

Description

  The present invention relates to a cutting device represented by an electric razor, and is an improvement of a vibration generating mechanism that converts rotational power of a motor into reciprocating power. The cutting device according to the present invention can be applied to an electric clipper, an eyebrow sledge, etc. in addition to an electric razor.

  In the present invention, the rotational power of the horizontally disposed motor is converted into the power in the vertical direction, and then converted into the power in the left and right direction to drive the reciprocating blade. The electric razor provided with this type of vibration mechanism Are known from US Pat. In Patent Document 1, after the rotational power of the motor is converted into reciprocating power by an eccentric cam fixed to the output shaft of the motor and a lifting arm that is reciprocated up and down by the eccentric cam, the vertical movement of the lifting arm is reduced to L The reciprocating blade is reciprocated in the left-right direction by transmitting to the character-like swing arm. The electric razor of Patent Document 2 also basically adopts the same drive form as that of Patent Document 1, except that a member corresponding to an elevating arm and an L-shaped oscillating arm are connected via a hinge portion bent at a right angle. Are different from each other. In the vibration generating mechanism according to Patent Document 3, the rotational power of the motor is converted into the reciprocating motion in the vertical direction by the eccentric cam fixed to the output shaft of the motor and the passive piece that is reciprocated up and down by the eccentric cam. In addition, the vertical movement of the passive piece is converted into a horizontal movement by a pinion and a drive block, and the reciprocating blade is driven to reciprocate in the horizontal direction.

Japanese Utility Model Publication No. 52-115396 (first page, FIG. 5) Japanese Utility Model Publication No. 56-23067 (first page, FIG. 3) Japanese Patent Laying-Open No. 2005-73940 (FIG. 1)

  In the vibration generating mechanism of Patent Document 1 and Patent Document 2, the rotational power of the motor is converted into a vertical reciprocating motion by the eccentric cam and the lifting arm, and then the vertical motion of the lifting arm is transmitted to the swinging arm so as to move in the horizontal direction. Converts to the reciprocating direction and drives the reciprocating blade. Therefore, it is necessary to secure an operating space for the swing arm and the lifting arm between the motor and the reciprocating blade, so that a dead space is likely to be generated in the peripheral portion of each arm, and use of space in the razor head is wasted. Since the movement is converted between the lifting arm and swing arm, there are many movable parts, and a structure that absorbs the trajectory difference between both arms is required at the connecting part between the lifting arm that moves up and down and the swing arm that swings left and right. Therefore, it is inevitable that power transmission loss will occur.

  On the other hand, in Patent Document 3, a rack-pinion-type vibration generating mechanism is adopted, so that the vibration generating mechanism can be configured as a positive mechanism without play, and therefore, compared to the forms described in Patent Documents 1 and 2, Operation conversion can be performed with improved power transmission efficiency. In addition, since it is easy to minimize the amount of operation space occupied by the passive piece that reciprocates and the drive block, it is possible to eliminate the occurrence of dead space in the periphery of the vibration generating mechanism. It is possible to improve the degree of aggregation of the component parts in the head unit by realizing the centralized arrangement of the parts in the peripheral portion.

  However, since the vibration generating mechanism described in Patent Document 3 uses two reciprocating drive members, a passive piece that reciprocates up and down and a drive block that reciprocates left and right, as a power transmission element, vibration noise that accompanies both members reciprocating. It is difficult to suppress the noise, and it is inevitable that the noise level becomes high when using an electric razor. Since stress concentrates on the sliding surface between the pinion and the passive piece and the sliding surface between the pinion and the drive block, there is a disadvantage in that the part is easily worn away and lacks in reliability and durability.

  The object of the present invention is to improve the vibration generating mechanism, so that the rotational power of a horizontally placed motor can be efficiently converted into left and right reciprocating power, and dead space is generated in the periphery of the vibration generating mechanism. It is an object of the present invention to provide a cutting device that eliminates the above-described problem and enables the concentrated arrangement of components by that amount, thereby improving the degree of integration of components in the cutting device. In addition, the object of the present invention is to reduce noise by devising the vibration generating mechanism, and there is no room for malfunction due to uneven wear, so that the reciprocating blade can always be reciprocated in the left-right direction reliably. In order to obtain a cutting device with excellent durability and durability.

  As shown in FIG. 2, the present invention is a cutting device that drives the reciprocating blade 106 by converting the rotational power of the horizontally disposed motor 36 into reciprocating power in the left-right direction by the vibration generating mechanism G2. As shown in FIGS. 1 and 9, the vibration generating mechanism G <b> 2 includes a vertical transmission mechanism including a face gear 65 and a horizontal transmission mechanism including one or a plurality of gears connected to the face gear 65. An eccentric cam 70 is formed on the final gear 69 of the lateral transmission mechanism, and the vibrator 105 is reciprocated in the left-right direction by the eccentric cam 70 so that the reciprocating blade 106 is reciprocated in the left-right direction. Configure. In the illustrated example, an example in which the lateral transmission mechanism is configured by the third gear 66 to the sixth gear 69 is illustrated, but the configuration of the gear is not limited thereto. Moreover, you may comprise a part of horizontal direction transmission mechanism with the winding transmission mechanism containing a belt.

  In addition to the electric razor as shown in FIGS. 1 to 14, the cutting apparatus according to the present invention includes devices such as electric clippers and eyebrows as shown in FIGS. As shown in FIGS. 1 to 16, the face gear 65 receives the rotational driving force of the motor 36 via a gear (sun gear 53) fixed to the output shaft 36a of the motor 36, as shown in FIG. In addition, the face gear 65 can be directly fixed to the output shaft 36a of the motor 36.

  As shown in FIGS. 1, 10, and 12, the motor 36 is housed and fixed in a motor housing 37 that covers the outer surface of the motor 36, and the vertical transmission mechanism and the horizontal transmission mechanism are assembled to the motor housing 37. Can take the form.

  As shown in FIGS. 10 and 12, the motor housing 37 can be composed of a cylindrical motor holder 38 that accommodates most of the motor 36 and a motor cover 39 that closes the opening of the motor holder 38. In addition, the motor cover 39 is provided with a gear shaft 73 of the face gear 65 and a gear shaft 75 of a gear 66 constituting a lateral transmission mechanism that receives the rotational driving force of the face gear 65. The gear shaft 77 of the final stage gear 69 can be in the form of being provided on the gear chassis 41 attached to the motor holder 38 so as to be held.

  According to the cutting device of the present invention, the gear transmission mechanism including the longitudinal transmission mechanism including the face gear 65 and the lateral transmission mechanism including the gear 66 coupled to the face gear 65 is used to excite the reciprocating drive blade 106. Since the mechanism G2 is configured, the vibration generating mechanism G2 can be configured as a positive motion mechanism without play, and the power transmission efficiency is higher than that of the conventional vibration generating mechanism including the swing arm described in Patent Documents 1 and 2. A marked improvement can be achieved. Since the vibration generating mechanism G2 is a gear transmission mechanism that does not include a reciprocating vibration element, the amount of operation space occupied by the vibration generating mechanism is minimized as compared with the conventional rack-pinion type vibration generating mechanism described in Patent Document 3. Therefore, it is possible to eliminate the occurrence of dead space in the peripheral part of the vibration generating mechanism, and to realize the centralized arrangement of the parts in the peripheral part of the vibration generating mechanism, thereby consolidating the components in the cutting device The degree can be improved.

  When the vibration generating mechanism is configured by a gear transmission mechanism including the face gear 65, the vibration noise amount associated with the reciprocating drive of the passive piece as the rack element and the drive block as in the vibration generating mechanism according to Patent Document 3. The amount of noise generated during use can be reduced, and thus the cutting device can be made quieter. Like the rack-pinion type vibration generating mechanism, uneven wear due to stress concentration is unlikely to occur, and it is also excellent in that a cutting device with excellent reliability can be obtained by suppressing the occurrence of malfunction.

  When both the vertical direction transmission mechanism and the horizontal direction transmission mechanism are assembled in the motor housing 37, the components constituting each mechanism are assembled in a properly positioned state as compared with the case where the components constituting the mechanism are assembled in different members. Can be achieved, the operation of the vibration generating mechanism can be smoothed, and transmission loss can be reduced. Since the vibration generating mechanism G2 is integrated with the motor 36 and the motor housing 37 and can be handled as a single unit as the power module M, the labor of assembling the cutting device can be reduced. Since it can be assembled in the main body after confirming the operation of the power module M in advance, the reliability of the vibration generating mechanism G2 of the cutting apparatus can be improved. This eliminates the need for reassembly based on defective parts and contributes to improved production efficiency.

  In an embodiment in which all the gear shafts are provided on one member, the outer dimension of the member becomes large, and therefore it is inevitable that the positional deviation of the gear shaft increases when molding distortion occurs. For this reason, good meshing between the gears cannot be obtained, and malfunction is likely to occur. On the other hand, when the gear shafts 73 to 77 are divided and formed on the two members of the motor cover 39 and the gear chassis 41 as in the present invention, the external dimensions of the individual members 39 and 41 can be reduced. Therefore, the influence of molding distortion is small compared to the case where all the gear shafts 73 to 77 are provided on a single member, so that the occurrence of product defects can be suppressed and the cutting device can be manufactured with a high yield. In addition, it is possible to finely adjust the position of the gear shaft 77 of the final gear (sixth gear 69) by changing the attachment position of the gear chassis 41 to the motor housing 37 by a method such as engaging a spacer. Therefore, in this respect as well, it is possible to suppress the occurrence of malfunction due to the influence of molding distortion and contribute to the improvement of the yield.

  1 to 14 show an embodiment in which a cutting device according to the present invention is applied to an electric shaver. 2, 3, and 4, the electric razor includes a main body 1 that also serves as a grip, and a head 2 that is disposed above the main body 1. The main body 1 includes an inner case 5 that houses the secondary battery 3 and the control board 4, front and rear covers 6 and 7 that cover the inner case 5 from the front and rear surfaces, a display panel 8 that is assembled above and below the front cover 6, and It consists of a switch panel 9 and the like.

  As shown in FIG. 4, the inner case 5 is composed of a front inner case 5a and a rear inner case 5b which are divided into front and rear parts, and both cases 5a and 5b are joined via packing 5c with screws. By fastening, the inside of the inner case 5 can be sealed in a watertight manner. The front cover 6 is engaged and attached to the front inner case 5a. The rear cover 7 includes a cover body 7a that is engaged with and attached to the front inner case 5a, and a grip cover 7b that covers an opening in the lower half of the cover body 7a. A wrinkle blade unit 12 is incorporated in the upper back surface of the cover body 7a.

  The display panel 8 is formed of a semi-transparent half mirror. When the electric razor is used, the operation state and operation mode of the motor 36 can be displayed. When the motor 36 is stopped, a mirror for confirming the shaving result is displayed. Can be used as The switch panel 9 is provided with a push button type switch button 10 for starting or stopping the motor 36 and a push button type switch button 11 for switching the operation mode of the motor 36.

  5 to 7, the head unit 2 includes a power module M serving as a basic structure, a head case 16 that is attached and fixed to the power module M via a head inner frame 47 described later, and the head case 16. The inner blade unit 17 and the outer blade unit 18 are detachably mounted. The head unit 2 is attached to the main body unit 1 via a float mechanism described later, and the entire head unit 2 is supported in a state where the head unit 2 can swing in all directions including front and rear, left and right, up and down, and diagonal directions.

  5, 6, and 8, the inner blade unit 17 includes an inner blade frame 20 in which a pair of bearing walls 20 b and 20 b are integrally formed upright on both sides of a base wall 20 a that is long on the left and right, and a bearing of the inner blade frame 20. A pair of front and rear inner blades 21 and 21 disposed on the upper part of the wall and a pair of front and rear finger guards 22 and 22 disposed between the inner blades 21 are configured. As shown in FIG. 8, the inner blade 21 is a spiral inner blade formed by implanting and fixing a group of metal cutting blades 21b in a spiral shape on the peripheral surface of a cylindrical plastic holder 21a. Rotate around the horizontal shaft 21c projecting from both ends, and cut short hair in cooperation with the outer blade 32 (see FIGS. 6 and 13).

  As shown in FIG. 6, on the left bearing wall 20b of the inner cutter frame 20, inner cutter gears 23 and 23 that rotate together with the inner cutters 21 and a reverse gear 24 that meshes with one inner cutter gear 23 rotate. It is pivotally supported. The worn inner blade 21 is replaced together with the inner blade frame 20, and at the same time, both the inner blade gear 23, the reverse gear 24, and the protective body 22 are also replaced at the same time.

  As shown in FIGS. 5 and 8, the front and rear protection bodies 22 are pivotally supported by the left and right bearing walls 20b and 20b so as to be swingable up and down, respectively, and pinions 26 and 26 fixed to the swinging shaft portion. It is connected via a rack 27 that meshes with the pinion 26 so as to be interlocked. The protection body 22 includes protection pieces 22a that are alternately opposed to each other. When the rack 27 is pushed up and biased by a spring 25, the protection body 22 is always biased in a direction in which the protection piece 22a stands. Therefore, in a state where the outer blade unit 18 is removed from the head case 16, the pair of protective pieces 22 a can stand up along the adjacent side surface of the inner blade 21 and prevent the fingertip from entering between the inner blades 21. .

  In FIG. 6, the outer blade unit 18 includes an outer blade holder 29 whose upper and lower surfaces are open, and a blade body unit 30 that is detachably attached to the outer blade holder 29. The blade body unit 30 includes an outer blade frame 31 whose upper and lower surfaces are open, a pair of front and rear outer blades 32 and 32 that are formed in a reverse U shape by the outer blade frame 31, and both outer blades 32 and 32. The center blade 33 is mounted between 32 and the like. Lock buttons 100 for locking and holding the blade unit 30 are provided on both side walls of the outer blade holder 29. When the lock button 100 is pushed in, the blade unit 30 can be removed from the outer blade holder 29.

  In order to lock and hold the outer blade unit 18 mounted on the upper surface of the head case 16 so as not to be separable, lock bodies 34 are provided on the left and right inner surfaces of the head case 16 and the outer blade holder 29. The lock is biased in a direction to engage with the holder 29 (see FIGS. 5 and 10). When the lock body 34 is pushed against the spring 35, the engagement between the engagement recess 29a on the inner surface of the outer blade holder 29 and the engagement claw of the lock body 34 is released. 16 can be removed. In a state where the outer blade unit 18 is mounted on the head case 16, the outer blade frame that holds the front and rear outer blades 32, 32 comes into contact with the protection body 22, and the protection body 22 is against the urging force of the spring 25. The position is held in a horizontal position.

  As shown in FIG. 11, the power module M includes a horizontally disposed motor 36, a first transmission mechanism G <b> 1 that transmits motor power to the pair of front and rear inner blades 21, and motor power for the center blade 33 and the wrinkle blade unit. 12 includes a case and a cover group for incorporating the second transmission mechanism G2 that transmits power to the motor 12, the motor 36, and the components of both the power transmission systems G1 and G2. As shown in FIG. 11, the case and the cover group include a motor housing 37 that houses the motor 36, a reduction case 40 that houses the planetary gear mechanism 101 of the first transmission mechanism G <b> 1, and a gear fixed to the upper surface of the motor housing 38. It consists of a chassis 41, a gear cover 42, and the like. The motor housing 37 includes a cylindrical motor holder 38 that accommodates most of the motor, and a motor cover 39 that closes the opening of the motor holder 38.

  The motor holder 38 and the speed reduction case 40 are each made of a die-cast molded product made of aluminum. Side frames 44 and 45 facing the left and right are respectively provided on the outer end of the motor holder 38 and the outer end of the speed reduction case 40. It protrudes upward. The motor cover 39, the gear chassis 41, and the gear cover 42 are all made of a plastic molded product.

  As shown in FIG. 11, after the motor 36 is accommodated in the motor holder 38, the motor cover 39 is assembled to the motor holder 38 via the packing 43, and the planetary gear mechanism 101 and the reduction case 40 are attached to the outer surface of the motor cover 39. The three members 38, 39 and 40 and the gear chassis 41 mounted on the outer surface of the motor holder are fastened together with three screws 46 screwed from the speed reduction case 40 side, thereby fixing four members. 38, 39, 40 and 41 are integrated. In the fixed state by the screws 46, the entire outer periphery of the motor cover 39 is engaged with the motor holder 38. Therefore, both the members 38 and 39 can be fixed together with a large fixing force.

  In FIG. 7, a square frame-shaped head inner frame 47 is disposed between the side frame 44 of the motor holder 38 and the side frame 45 of the speed reduction case 40, and screws screwed from the outside of the side frames 44 and 45. It is fixed at 48. Screw bosses 49 are provided at the four corners of the inner frame 47 so as to sandwich the side frames 44 and 45 in the front and rear directions, and the head case 16 is fastened and fixed to these screw bosses 49 with screws 50.

  The first transmission mechanism G1 includes a front transmission mechanism and a rear transmission mechanism. 9, the front transmission mechanism is arranged on the planetary gear mechanism 101 for reducing the rotational power of the motor 36, the winding transmission mechanism arranged along the side frame 45 of the reduction case 40, and the upper inner surface of the side frame 45. The final stage gear 52 is used. The planetary gear mechanism 101 is housed in a space between the motor cover 39 and the speed reduction case 40, and includes a sun gear 53 fixed to the output shaft 36 a of the motor 36 and three planetary gears 54 that mesh with the sun gear 53. A planetary frame 55 that rotatably supports the three planetary gears 54, an internal gear 56 that is provided on the inner surface of the reduction case 40 and meshes with the planetary gears 54, and a reduction shaft that rotates together with the planetary frame 55. 57 or the like.

  9, the winding transmission mechanism is composed of a driving pulley 59 fixed to the reduction shaft 57, a driven pulley 61 fixed to the final gear shaft 60, a timing belt 62 wound around both pulleys 59 and 61, and the like. To do. The final gear 52 is fixed to the final gear shaft 60 on the inner surface side of the side frame 45. The entire winding transmission mechanism is covered with a cover 63, and this cover 63 is fixed to the side frame 45 with a screw 48 for fixing the head inner frame 47 and a screw below it. The rear transmission mechanism includes two inner blade gears 23 and 23 and a reverse gear 24 assembled to the bearing wall of the inner blade frame 20.

  In FIG. 9, the second transmission mechanism G2 is a vibration generating mechanism that converts the rotational power of the motor 36 into reciprocating power in the left-right direction and transmits it to the movable blade (reciprocating blade) 106 of the center blade 33 (hereinafter referred to as the second power transmission mechanism). The transmission mechanism and the vibration generating mechanism are denoted by reference numeral G2.) The second transmission mechanism G <b> 2 includes a vertical transmission mechanism disposed on the outer surface of the motor cover 39 and a lateral transmission mechanism disposed along the upper surfaces of the motor cover 39 and the gear chassis 41. The vertical transmission mechanism includes a first gear 64 that meshes with the sun gear 53 and a face gear 65 that is integrally provided on one surface of the first gear 61. The lateral transmission mechanism meshes with the third gear 66 that meshes with the face gear 65 on the top surface of the motor cover 39, the fourth gear 67 that is provided integrally with the bottom surface of the third gear 66, and the fourth gear 67 on the top surface of the gear chassis 41. The fifth gear 68, a sixth gear 69 that meshes with the fifth gear 68, an eccentric cam 70 that is integrally provided on the upper surface of the sixth gear 69, an eccentric pin 71, and the like. The outer surface of the gear group from the first gear 64 to the sixth gear 69 is covered with a gear cover 42. The gear cover 42 is engaged and attached to the gear chassis 41.

  As shown in FIG. 1, the first gear 64 and the face gear 65 that constitute the longitudinal transmission mechanism have a gear shaft 73 that extends in the same direction as the direction in which the output shaft 36 a of the motor 36 extends (the direction of the rotation center axis of the motor 36). The third to sixth gears 66, 67, 68, 69 constituting the lateral transmission mechanism are rotatably supported by the gear shafts 75, 76, extending in a direction perpendicular to the extending direction of the output shaft 36a. 77 is rotatably supported on the shaft. Among these gear shafts 73 to 77, the first gear 64 and the face gear 65, the third gear 66 and the fourth gear 67, and the fifth gear 68 are the three gear shafts 73 and 75 provided on the motor cover 39.・ It is pivotally supported by 76. Specifically, as shown in FIG. 1, a first gear shaft 73 that pivotally supports the first gear 64 and the face gear 65 is provided on the outer surface of the motor cover 39 that faces the planetary gear mechanism 101. On the upper surface of the motor cover 39, a second gear shaft 75 that supports the third gear 66 and the fourth gear 67 and a third gear shaft 76 that supports the fifth gear 68 are provided. The first gear shaft 73 is a metal cylinder, and is fitted and mounted in a mounting hole 79 that is recessed in the outer surface of the motor cover 39. The second gear shaft 75 and the third gear shaft 76 are formed as cylindrical bodies that project integrally upward from the upper surface of the motor cover 39 (see FIGS. 11 and 12).

  A sixth gear 69 serving as the final gear of the lateral transmission mechanism is rotatably mounted on a gear shaft 77 provided on the gear chassis 41. 11 and 12, the gear chassis 41 includes a pair of front and rear peripheral walls 80 and 81 that hold the front and rear peripheral surfaces of the motor holder 38, and an upper wall that contacts the upper surface of the motor holder 38 and connects the front and rear peripheral walls 80 and 81. 82 and a bottom wall 83 that is formed at the lower end of the peripheral wall 80 on the back side and receives the bottom surface of the motor holder 38, and the like. The gear shaft 77 protrudes upward. As described above, when the gear chassis 41 is configured to hold the motor holder 38, the structural strength can be improved, and the gear holder 41 can be mounted on the motor holder 38 with a large fixing force without rattling. .

  As shown in FIG. 12, the gear cover 42 includes a vertical cover portion 85 having a cylindrical outer shell that covers the first gear 64 and the face gear 65, and a lid-like horizontal cover that covers the third to sixth gears 66 to 69. This is a plastic molded product provided with the portion 86. The upper surface of the horizontal cover portion 86 is formed in a stepped shape having an upper base end portion 87 connected to the vertical cover portion 85 and a lower protrusion end portion 88 connected to the base end portion 87. A through-hole 89 that allows the eccentric cam 70 and the eccentric pin 71 to protrude upward is formed in the central portion.

  The rotational power transmitted by the second transmission mechanism G2 is converted into reciprocating power by the eccentric cam 70 and the L-shaped vibrating arm 90 that engages with the eccentric cam 70, and reciprocates the movable blade of the scraper blade unit 12. To drive. As shown in FIG. 12, the horizontal piece 90 a of the vibrating arm 90 positioned on the upper surface of the gear cover 42 is engaged with a bearing hole 92 that engages with a longitudinal axis 91 formed in the gear chassis 41 and an eccentric cam 70. An elliptical engagement hole 93 is formed, and when the eccentric cam 70 is rotated, the vibration arm 90 is reciprocated in the left-right direction around the vertical axis 91. As shown in FIGS. 13 and 14, a drive groove 95 is provided in the output piece 90 b of the vibrating arm 90 exposed from the back surface of the head portion 2, and the shave blade unit 12 is moved by pushing up the shave lever 96. By switching to the use posture, the passive piece 97 of the scraper blade unit 12 is engaged with the drive groove 95, and the reciprocating power is inherited. The razor blade unit 12 can mainly cut sideburn hair, long hair, and the like.

  Similarly, the rotational power transmitted by the second transmission mechanism G2 is converted into reciprocating power by the eccentric pin 71 and the vibrator 105 engaged with the eccentric pin 71, and the movable blade 106 of the center blade 33 is driven to reciprocate. . As shown in FIGS. 7 and 9, the vibrator 105 is assembled to the inner surface of the head inner frame 47, and the passive groove 107 provided on the lower surface thereof is engaged with the eccentric pin 71. A drive shaft 109 provided at the upper center of the vibrator 105 protrudes from the upper surface of the head case 16 and engages with the movable blade 106 of the center blade 33. A space between the drive shaft 109 and the opening of the head case 16 is sealed with a packing 110 (see FIGS. 5 and 7).

  5 and 9, the center blade 33 is composed of a stainless steel comb-shaped fixed outer blade 102 and a stainless steel comb-shaped movable blade 106 that is in sliding contact with the fixed outer blade 102 from the inside. A plastic interlocking piece 103 that engages with the drive shaft 109 of the previous vibrator 105 is fixed to the inner surface of the movable blade 106, and the movable blade 106 reciprocates left and right via the interlocking piece 103 on the drive shaft 109. By driving, a shaving operation is performed. Reference numeral 104 denotes an engagement groove that is provided at the lower end of the interlocking piece 103 and engages with the drive shaft 109. The center blade 33 is provided mainly for the purpose of cutting long hairs and comb hairs. Thus, the center blade 33, the outer blade 32, and the inner blade 21 cooperate to shave from long hair to short hair in one operation.

  In order to lock and hold the inner blade unit 17 fitted and mounted on the upper surface of the head case 16 in a non-separable manner, a square lock frame 111 is incorporated in the head inner frame 47 and is locked by a spring 112. As shown in FIG. 7, four lock claws 113 protruding from the upper surface of the head case 16 are provided on the left and right sides of the front and rear frames of the lock frame 111, and these claws 113 are provided on the lower surface of the inner blade frame 20. The inner blade unit 17 is locked and held by engaging with the engaging piece 114.

  The lock frame 111 can be unlocked by a release knob 105 provided on the outer surface of the side frame 44 on the motor holder 38 side. When the release knob 115 is pushed down and the passive leg pieces 116 provided on the front and back surfaces of the lock frame 111 are laterally moved against the urging force of the spring 112, the engagement between the lock pawl 113 and the engagement piece 114 is performed. The inner blade frame 20 can be removed from the head case 16 by releasing. The outer surface excluding the slide range of the operation protrusion of the release knob 115 is covered with a cover 117 fastened and fixed to the side frame 44 using a screw 48 for fixing the head inner frame 47. In FIG. 7, reference numeral 119 denotes a cover that is engaged with the head case and covers the lower half peripheral surface of the power module M from the front and the back.

  7, 10, and 13, the float mechanism that supports the head unit 2 includes a float base 120 fixed to the upper end of the inner case 5, and a pair of left and right compressions disposed between the float base and the power module. It consists of coil-shaped springs 121 and 121. The float base 120 includes a central connecting seat 122, a pair of left and right spring receiving arms 123 and 123 bent in a paragraph shape from the connecting seat 122, and a pair of front and rear mounting arms 124 and 124 bent in a paragraph shape from the connecting seat 122. Is a press-molded product that is integrally provided.

  As shown in FIG. 13, a connecting boss 125 communicated from the lower surface side to the center portion of the connecting seat 122 is externally fitted to a screw boss 126 provided at the center of the lower surface of the motor holder 38, and both of them are connected to the connecting boss 125 side. The float base 120 can be integrated with the head unit 2 by fastening with a screw 127 screwed into the screw boss 126. As shown in FIG. 10, the spring 121 is interposed between the left and right spring receiving arms 123 and the power module M and is compressed and deformed. By inserting and engaging the front and rear mounting arms 124 into engagement recesses 128 provided in the inner case, and fastening the two front and rear portions of the rear mounting arm 124 to the inner case with screws 129, the head portion is integrated with the main body portion. As a result, the entire head portion can swing in all directions including front and rear, left and right, up and down, and diagonal directions.

  In the electric shaver having the above configuration, a gear transmission mechanism comprising a vertical transmission mechanism including the face gear 65 and a horizontal transmission mechanism including third to sixth gears 66, 67, 68, and 69 coupled to the face gear 65. Thus, since the vibration generating mechanism G2 (second transmission mechanism) for the movable blade 106 of the center blade 33 is configured, the vibration generating mechanism G2 can be configured as a positive movement mechanism without play, and is described in the conventional patent documents 1 and 2. Compared with the vibration generating mechanism provided with the swing arm, the power transmission efficiency can be remarkably improved. Since the vibration generating mechanism G2 is a gear transmission mechanism, the amount of motion space occupied by the vibration generating mechanism is minimized as compared with the conventional vibration generating mechanism including a passive piece and a driving block that reciprocate as described in Patent Document 3. It becomes easy to limit. Therefore, it is possible to eliminate the occurrence of a dead space in the peripheral portion of the vibration generating mechanism, and to realize the concentrated arrangement of components in the peripheral portion of the vibration generating mechanism, thereby improving the degree of component concentration in the head unit 2.

  When the vibration generating mechanism G2 is configured by a gear transmission mechanism including the face gear 65, the amount of vibration noise associated with the reciprocating drive of the passive piece and the drive block is increased as in the vibration generating mechanism according to Patent Document 3. Therefore, the amount of noise generated during use can be reduced, thus contributing to the quietness of the electric razor. Like the rack-pinion type vibration mechanism described in Patent Document 3, uneven wear due to stress concentration is unlikely to occur, and it is excellent in that an electric razor with excellent reliability can be obtained by suppressing the occurrence of malfunction. ing.

  When both the vertical direction transmission mechanism and the horizontal direction transmission mechanism are assembled in the motor housing 37, the components constituting each mechanism are assembled in a properly positioned state as compared with the case where the components constituting the mechanism are assembled in different members. Therefore, the operation of the vibration generating mechanism G2 can be smoothed and the transmission loss can be reduced. Since the vibration generating mechanism G2 is integrated with the motor 36 and the motor housing 37 and can be handled as a single unit as the power module M, the labor of assembling the electric razor can be reduced. Since the power module M can be assembled in the main body after confirming the operation of the power module M in advance, it is possible to improve the reliability of the power transmission mechanism of the electric razor. This eliminates the need for reassembly based on defective parts and contributes to improved production efficiency.

  In the embodiment in which all the gear shafts 73 to 77 are provided on one member, the outer dimensions of the member increase, and therefore, when molding distortion occurs, the position accuracy of the gear shafts 73 to 77 is poor due to the influence. This is unavoidable, and good meshing of the gears cannot be obtained, and malfunction tends to occur. On the other hand, when the gear shafts 73 to 77 are divided and formed on the two members of the motor cover 39 and the gear chassis 41 as in the present embodiment, the outer dimensions of the individual members 39 and 41 are reduced. Therefore, the influence of the molding distortion can be made as small as possible compared with the case where all the gear shafts 73 to 77 are provided on a single member, and thus the reliability of the vibration generating mechanism G2 is improved. Can be achieved. It is also possible to improve the product yield. The position of the gear shaft 77 of the final gear (sixth gear 69) can be finely adjusted by changing the mounting position of the gear chassis 41 with respect to the motor housing 37 by a method such as biting a spacer. This is also excellent in that the influence of molding distortion is minimized and the meshing between the gears 64 to 69 can be maintained in a good state.

  FIG. 15 shows an embodiment in which the present invention is applied to an electric clipper. There, a clipper blade (reciprocating blade) disposed at one end of the main body case 130 is driven by the vibration generating mechanism of the present invention. FIG. 16 shows an embodiment in which the present invention is applied to an electric hair clipper or an eyebrow sled, in which the hair clipper blade is arranged on one side of the main body case that also serves as a grip. As is apparent from the embodiments shown in FIGS. 15 and 16, in the cutting apparatus of the present invention, the rotation center axis of the motor and the reciprocating direction of the reciprocating blade are in a parallel or substantially parallel relationship. The left-right direction corresponds to the driving direction of the reciprocating blade, and the up-down direction can be said to be a direction substantially orthogonal to the driving direction of the reciprocating blade.

  FIG. 17 shows another embodiment of the cutting device according to the present invention, in which the face gear 65 is attached to the output shaft 36a of the motor 36, as compared with the embodiments of FIGS. Is different. Since the other points 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.

  In the said embodiment, although the form which drives the center blade for shaving long hair with the vibration mechanism G2 was shown, this invention is not restricted to this, The short hair which consists of a mesh-like outer blade and a reciprocating inner blade is shaved. The cutting means for driving may be driven by the vibration generating mechanism G2. A part of the lateral transmission mechanism may be constituted by a winding transmission mechanism. Specifically, a winding transmission mechanism including a belt may be disposed between the fourth gear 67 and the sixth gear 69. According to this, the cutting device can be further silenced.

It is a vertical front view which shows a vibration generating structure. It is a front view of an electric razor. It is a side view of an electric razor. It is a disassembled perspective view which shows the structure of a main-body part. It is a disassembled front view of the head part which fractured | ruptured some structures. It is the disassembled side view of the outer blade and inner blade which fractured | ruptured some structures. It is a disassembled perspective view of a head part. It is a disassembled perspective view of an inner blade unit. It is explanatory drawing shown in the state which expand | deployed the power transmission structure. It is a vertical front view of a head part. It is a disassembled perspective view of a power module. It is a disassembled perspective view of the main components of a power module. It is a vertical side view of a head part. It is a top view of a power module. It is a schematic block diagram which shows another embodiment of a cutting device. It is a schematic block diagram which shows another embodiment of a cutting device. It is a schematic block diagram which shows another embodiment of a cutting device.

Explanation of symbols

36 Motor 37 Motor housing 38 Motor holder 39 Motor cover 41 Gear chassis 65 Face gear 66 Gear (third gear)
67 Gear (4th gear)
68 Gear (5th gear)
69 Final gear (6th gear)
70 Eccentric cam 73 Gear shaft 75 Gear shaft 77 Gear shaft 105 Vibrator 106 Reciprocating blade (movable blade)

Claims (1)

A cutting device for driving the reciprocating blade (106) by converting the rotational power of the horizontally disposed motor (36) into reciprocating power in the left-right direction by the vibration generating mechanism (G2),
The vibration generating mechanism (G2) includes a vertical transmission mechanism including a face gear (65) and a horizontal transmission mechanism including one or more gears connected to the face gear (65).
An eccentric cam (70) is formed in the final gear (69) of the lateral transmission mechanism, and the vibrator (105) is reciprocated in the left-right direction by the eccentric cam (70), whereby a reciprocating blade ( 106) is reciprocated in the left-right direction ,
A motor (36) is housed and fixed in a motor housing (37) covering the outer surface of the motor (36);
A vertical transmission mechanism and a horizontal transmission mechanism are assembled to the motor housing (37).
The motor housing (37) includes a cylindrical motor holder (38) that accommodates most of the motor (36) and a motor cover (39) that closes the opening of the motor holder (38).
The motor cover (39) includes a gear shaft (73) of the face gear (65) and a gear shaft (75) of the gear (66) constituting a lateral transmission mechanism that receives the rotational driving force of the face gear (65). Is provided,
A cutting device characterized in that the gear shaft (77) of the final gear (69) of the lateral transmission mechanism is provided in a gear chassis (41) mounted in a holding manner on the motor holder (38) .

Images