JP4450366B2 - Rotary electric razor - Google Patents

Description

  The present invention relates to an electric razor having a rotary inner blade, and is an improved inner blade unit attachment / detachment structure.

  In a rotary electric shaver, it is known to make the inner blade unit detachable from the base of the head unit (Patent Document 1). Here, an inner blade unit is constituted by a pair of front and rear inner blades and an inner blade holder, and the inner blade unit can be fixed to the base by press-fitting the inner blade holder to the base from above. Another electric razor adopts a form in which the inner blade unit can be attached and detached along the rotation center axis of the inner blade (Patent Document 2).

Japanese Patent Laid-Open No. 9-38352 (paragraph number 0023, FIG. 1) JP-A-8-38750 (paragraph number 0026, FIG. 1)

  Patent Document 1 adopts a mounting structure in which the inner blade unit is press-fitted with respect to the base from above. However, since the inner blade unit and the outer blade unit are attached in the same direction with respect to the base, the outer blade holder is used as a base. When removing from the base, even the inner blade unit may be separated from the base. When the inner blade unit is mounted on the base, the front and rear inner blade gears mesh with the final gear at the same time, but depending on the variation in the finished dimensions of the inner blade holder, the front and rear inner blade gears become the final gear. It becomes difficult to mesh evenly.

  The front and rear inner blade gears receive rotational force in the reverse direction from the final gear, but the engagement between the inner blade gear on the side receiving the upward rotational force and the final gear is shallow, and noise is likely to be generated. Since the internal space of the base is occupied by the engagement structure for engaging and fixing the inner blade unit and the outer blade holder, it is possible to install a reciprocating power transmission system avoiding both engagement structures in the base. Therefore, there is a restriction that an electric razor in which a reciprocating center blade is arranged between a pair of front and rear rotary inner blades cannot be configured.

  In Patent Document 2, since the inner blade unit is attached and detached along the rotation center axis of the inner blade, replacement of the inner blade unit and cleaning of the inner blade can be easily performed. However, since the rotation shafts at both ends of the inner blade are supported by two independent parts connected to each other, the rotation center of the inner blade is likely to shift.

  An object of the present invention is to reliably prevent the inner blade unit from being separated from the head case constituting the head unit when the outer blade holder is attached and detached, and to quickly and easily attach / detach the inner blade unit to / from the head case. It is to provide an electric razor that can be used. The object of the present invention is to allow the inner blade unit to be mounted on the head case with the front and rear inner blade gears meshing appropriately with the final gear, so that the power transmission efficiency between the final gear and the inner gear is improved. It is to provide an electric razor that can be improved.

  In the rotary electric shaver of the present invention, as shown in FIGS. 11 and 12, the inner blade unit 110 is detachably attached to the head case 35 constituting the head unit 2, and the outer blade holder 3 is attached to the head. It is attached to and detached from the case 35 in the vertical direction. The inner blade unit 110 includes a cylindrical inner blade 113 having inner blade shafts 114 at both left and right ends, an inner blade frame 112 that rotatably supports the inner blade shaft 114, and an inner blade fixed to one inner blade shaft 114. Blade gear 115. On the head case 35 side, a final gear 54 that meshes with the inner blade gear 115 is provided.

  Mounting portions 101 for inserting and engaging the inner blade unit 110 from the front-rear direction are formed on the left and right sides of the upper surface of the head case 35. The mounting portions 101 are engaged on the left and right sides of the lower portion of the inner blade frame 112. An engaging portion 116 is formed. The head case 35 is provided with a lock mechanism that locks and holds the inner blade unit 110 attached to the attachment portion 101 so that it cannot be removed.

  As shown in FIG. 8, the lock mechanism protrudes upward toward the outer side in the front-rear direction of the upper surface of the head case 35 and faces the mounting locus of the inner blade frame 112 with respect to the mounting portion 101 (see FIG. )) And the unlocking position retracted from the mounting locus (FIG. 14B), and the lock claw 120 configured to be slidable in the left-right direction and slidable in the left-right direction within the head case 35 , A slide body 122 that displaces the lock claw 120 between a locked posture and an unlocked posture, a lock spring 123 that moves and urges the slide body 122 in a direction in which the lock claw 120 is in the locked posture, A release operation knob 124 for unlocking the slide body 122 against the lock spring 123 in a direction in which the lock claw 120 is in the unlocked posture.As shown in FIG. 1, the outer surface of the inner blade frame 112 mounted on the mounting portion 101 with the lock claw 120 in the lock posture position in a state where the engaging portion 116 of the inner blade frame 110 is engaged with the mounting portion 101. And the inner blade unit 110 can be locked and held so as not to move back and forth.

  As shown in FIG. 1, it is desirable to provide a release operation knob 124 closer to the lower side than the inner blade 113 at the left and right ends of the head case 35 (see FIG. 1).

  As shown in FIG. 8, a pair of side frames 47 and 86 facing the left and right outer surfaces of the inner blade frame 112 protrude from the upper surface of the head case 35, and a release operation knob 124 can be provided on the outer surface of one side frame 86. .

  As shown in FIGS. 6 and 7, the motor 25 arranged horizontally and the motor case 30, which is a metal die-cast molded product that externally holds the motor 25, are assembled inside the head case 35. Then, the side frame 86 can be integrally projected on the upper surface side of the motor case 30, and the release operation knob 124 can be installed on the side frame 86.

  As shown in FIG. 8, it is desirable to form the lock claw 120 integrally with the slide body 122.

  As shown in FIGS. 14 (a) and 14 (b), it is desirable that the slide body 122 slide in the left-right direction when the release operation knob 124 slides up and down or in the front-rear direction. FIG. 14 shows a configuration in which the release operation knob 124 slides up and down.

  As shown in FIG. 8, a vibrator 73 for changing the rotational power of the motor 25 to the left and right reciprocating is assembled inside the razor head, and the vibrator 73 is attached to the left and right metal side frames 47 and 86. The head inner frame 34 is fixedly fastened, and the slide body 122 can be mounted on the upper side of the head inner frame 34 so as to be slidable in the left-right direction.

  As in the present invention, when the inner blade frame 112, the inner blade 113, the inner blade gear 115, and the like are unitized as the inner blade unit 110, each member is individually assembled to the head case 35 as compared with the case where each member is assembled separately. The accuracy of the position of the blade 113 and the support posture can be enhanced. In addition, the inner blade unit 110 is engaged and mounted in the front-rear direction with respect to the head case 35 so that the mounting direction of the inner blade unit 110 intersects the attaching / detaching direction (vertical direction) of the outer blade holder 3. Even when a vertical external force is applied to the inner blade unit 110 when the blade holder 3 is attached or detached, the inner blade unit 110 can be well prevented from moving. Therefore, it is possible to reliably prevent the inner blade unit 110 from being separated from the head case 35 together with the outer blade holder 3.

  When the inner blade unit 110 is configured to be attached and detached in the front-rear direction, the height of the inner blade gear 115 can be strictly defined as compared to a configuration in which the inner blade unit 110 is attached and detached in the vertical direction. Therefore, the variation in the distance between the shafts of the final gear 54 and the inner blade gear 115 can be reduced, the meshing of both the gears 54 and 115 can be optimized, and the power transmission efficiency can be improved.

  The inner blade unit 110 is inserted in the mounting portion 101 provided on the upper surface of the head case 35 by inserting and engaging the engaging portions 116 provided on both lower sides of the inner blade unit 110 to position both side ends of the inner blade frame 112. Is fixed to the head case 35, for example, compared with the case where only one central portion of the inner blade frame 112 is engaged with the head case 35, the accuracy of the position and support posture of the inner blade 113 is further increased. Even when an external force acts on the inner blade frame 112 due to a drop or the like, the external force can be strongly countered.

  As in the present invention, the head case 35 is provided with a lock mechanism including a lock claw 120, a slide body 122, a lock spring 123, a release operation knob 124, and the like, and the engaging portion 116 of the inner blade frame 110 is attached to the mounting portion 101. When the inner blade unit 110 mounted on the mounting portion 101 is locked and held so as not to move back and forth with the lock claw 120 in the locked posture position when engaged, a large external force such as a drop impact is applied to the inner blade unit 110. Even when acting on the inner blade 110, it is possible to reliably prevent the inner blade 110 from being displaced or detached from the mounting portion 101. Further, by operating the release operation knob 124 to displace the lock claw 120 to the unlocked position, the inner blade frame 112 can be moved by simply inserting the inner blade unit 110 into the mounting portion 101 and mounting it. The inner cutter gear 115 can be appropriately positioned with respect to the final gear 54 by being locked. Therefore, for example, after the engaging portion 116 is engaged with the mounting portion 101, the inner blade unit 110 can be quickly and easily attached as compared with the embodiment in which the inner blade unit 110 is fastened and fixed to the head case 35 with screws. Further, for example, the lock claw 120 is configured to be able to advance and retract in the vertical direction from the upper surface of the head case 35, and the inner blade unit 110 is more robust than a configuration in which the lock claw 120 is moved and urged upward by a spring. In addition, it can be securely fixed to the mounting portion 101. Therefore, it is possible to more strongly counter external forces such as a drop impact.

  If the release operation knobs 124 are provided at the left and right ends of the head case 35, the inner blade unit 110 is moved back and forth with the right hand while the release operation knob 124 is displaced in the direction in which the lock claw 120 is in the unlocked posture with the left hand. The inner blade unit 110 can be easily attached / detached. In addition, if the release operation knob 124 is provided at the left and right end portions of the head case 35, that is, at the end portion of the head case 35 in the direction intersecting with the loading / unloading direction (front-rear direction) of the inner blade unit 110, the inner blade unit 110 is provided. Since the release operation knob 124 can be operated at a distance from the mounting area, the finger operating the release operation knob 124 is less likely to come into contact with the inner blade 113 and be injured, and the safety of attaching / detaching the inner blade unit 110 can be reduced. It can be secured. In particular, if the release operation knob 124 is provided below the inner blade 113, even if the finger operating the release operation knob 124 slips during the removal operation of the inner blade unit 110, it touches the inner blade 113. There is no fear and it is possible to contribute to improving the safety of the attaching / detaching operation of the inner blade unit 110.

  If a pair of side frames 47 and 86 facing the left and right outer surfaces of the inner blade frame 112 are provided from the upper surface of the head case 35, and a release operation knob 124 is provided on one of the side frames 47 and 86, the same as before. Since the release operation knob 124 can be operated away from the mounting area of the inner blade unit 110, there is no problem that the finger operating the release operation knob 124 contacts the inner blade 113 and is injured. When the release operation knob 124 is provided in the side frames 47 and 86 existing in the space covered with the outer blade case 3, the release operation knob 124 is provided so as to be exposed on the outer surface of the head case 2. There is little possibility that the release operation knob 124 is inadvertently operated.

  If one side frame 86 having the release operation knob 124 is a metal molded product integrated with the motor case 30, the release operation knob 124 can be operated in a state of being firmly supported by the side frame 86. The operability of the release operation knob 124 is improved.

  If the lock claw 120 is formed integrally with the slide body 122, there is no need to separately provide a member for connecting the slide body 122 and the lock claw 120, and the number of parts can be reduced by that amount, and an electric shaver. An increase in the overall manufacturing cost can be suppressed.

  If the slide body 122 slides in the left-right direction by moving the release operation knob 124 up and down or in the front-rear direction, the slide body 122 is moved in the left-right direction by sliding the release operation knob 124 in the left-right direction. Compared to the form of sliding, the protrusion of the release operation knob 124 in the left-right direction can be suppressed, and the release operation knob 124 can be stored clearly. According to this, the horizontal width dimension of the whole head unit 2 can be made small, and it can contribute to size reduction of an electric shaver.

  If the slide body 122 is mounted on the upper side of the head inner frame 34 that supports the vibrator 73 so as to be slidable in the left-right direction, there is no need to separately provide a member for supporting the slide body 122, and only by that amount. Since the number of parts can be reduced and the slide body 122 can be arranged using the space surrounded by the head inner frame 34, it is possible to contribute to miniaturization of the electric razor. When the slide body 122 is slidably attached to the head inner frame 34 that is firmly fixed by the metal side frames 47 and 86, the head inner frame 34 is not displaced and the left and right sides of the slide body 122 are left and right. Since the movement is stable, the operability of the lock mechanism can be improved.

  1 to 16 show a rotary electric shaver according to an embodiment of the present invention. 2 to 4, the electric razor includes a main body case 1, a head unit 2 provided on the main body case 1, an outer blade holder 3 attached to and detached from the head unit 2, and an electric component unit 4 accommodated in the main body case 1. Etc. On the front surface of the main body case 1, a switch button 5 for starting the motor, a select button 6 for switching the operation state of the motor 25, and various display bodies are provided. In FIG. 3, the back side of the main body case 1 is provided with a squeeze blade 8 and a slide knob 9 that pushes up the squeeze blade 8 to a use posture.

  As shown in FIG. 4, the electrical component unit 4 includes an inner frame 13, a circuit board 14 and a pair of left and right secondary batteries 15 disposed on the front and rear surfaces thereof, a switch mounted on the circuit board 14, and a plurality of switches. Display LEDs and the like. A float frame 16 for swinging and supporting the head unit 2 is integrally formed on the upper portion of the inner frame 13.

  In FIG. 5, the main body case 1 includes a main case 18 having only an upper surface opened, a pair of first decorative covers 19 that cover the front and rear surfaces of the main case 18, and a second decorative cover 20 that covers the left and right surfaces of the main case 18. It consists of The electrical component unit 4 is loaded into the main case 18, and a screw 21 (see FIG. 4) inserted through the bottom wall of the main case 18 is screwed into the screw boss at the lower end of the electrical component unit 4. 18 can be integrated. The screw 21 and the plug pin exposed on the bottom wall are each sealed in a watertight manner with a seal ring.

  In FIG. 6, the head unit 2 is transmitted to a motor 25 arranged horizontally, a first transmission system that transmits motor power to a pair of left and right main blades 26, and a center blade 27 that is disposed between the main blades 26. The second transmission system, the motor 25, and a case group that accommodates the components of both transmission systems. Specifically, as shown in FIGS. 7 to 9, the motor case 30 and the motor cover 31 that house the motor 25, the speed reduction case 32 that is incorporated on the outer surface of the motor cover 31, and the motor case 30 are incorporated on the upper surface side. A gear chassis 33, a head inner frame 34 that supports a vibrator 73 described later, a head case 35 that covers these case groups from the upper surface side, and the like. As shown in FIG. 9, a head lower frame 36 and a decorative frame 37 are assembled to the lower surface of the head case 35, and a float base 38 and a case packing 39 are assembled to the lower surface of the motor case 30. The main blade 26 is a finishing blade and mainly cuts short hairs.

  The first transmission system includes a front speed reduction mechanism, a winding transmission mechanism disposed between the mechanism and the main blade 26, and the like. The front stage reduction mechanism includes a planetary gear mechanism and a reduction case 32 that houses the planetary gear mechanism. 7, the planetary gear mechanism includes a sun gear 42 fixed to the output shaft 41 of the motor 25, three planetary gears 43 that mesh with the sun gear 42, and a planetary frame 44 that rotatably supports each planetary gear 43. And an internal gear that is provided on the inner surface of the speed reduction case 32 and meshes with the planetary gears 43, and a speed reduction shaft 46 that is pivotally supported by the speed reduction case 32 and outputs the rotational power of the planetary frame 44. The speed reduction case 32 is made of a die-cast product made of aluminum, and a side frame 47 for supporting the winding transmission mechanism projects upward on the outer surface of the circular cap-shaped main case portion.

  7 and 10, the winding transmission mechanism includes a driving pulley 49 fixed to the reduction shaft 46, a driven pulley 50 disposed on the upper outer surface of the side frame 47, and the pulleys 49 and 50. And a tension roller 52 that absorbs the slack of the timing belt 51. The driven pulley 50 is fixed to a final stage shaft 53 fixed to the upper center of the side frame 47, and a final stage gear 54 is fixed to the opposite shaft end across the side frame 47. As shown in FIG. 8, each component constituting the winding transmission mechanism is disposed along the outer surface of the side frame 47 and covered with a cover 55 attached to the outer surface of the side frame 47.

  As shown in FIG. 6, the second transmission system is branched in the middle of the first transmission system to transmit the rotational power to the upper side of the motor 25, the lateral transmission system 58 </ b> A, the center blade 27, and the like. And a vertical transmission system 58B provided between the two.

  As shown in FIGS. 6 and 7, the lateral transmission system 58A includes a branch pulley 60 fixed to one end of the branch shaft 61 and meshing with the timing belt 51, a face gear 62 fixed to the other end of the branch shaft 61, An intermediate gear 63 that meshes with the gear 62 and a cam gear 64 that meshes with the intermediate gear 63 are configured. The branch pulley 60 is disposed on the inner surface of the movement locus of the timing belt 51. As shown in FIG. 8, the face gear 62 is disposed near the left and right center of the upper surface of the motor 25.

  A gear chassis 33 is mounted on the outer surface of the motor case 30 in order to support the gears 62, 63, and 64 that constitute the lateral transmission system 58A. In FIG. 7, the gear chassis 33 is integrally provided with a flat upper wall 66 and a peripheral wall 67 that holds the front and rear peripheral surfaces of the motor case 30 continuously in front of and behind the upper wall 66. A bearing 68 that supports the branch shaft 61 and gear shafts 69 and 70 that support the intermediate gear 63 and the cam gear 64 project from the upper surface of the upper wall 66.

  The gear chassis 33, the motor case 30, the motor cover 31, and the speed reduction case 32 are fastened and integrated with four screws 71 screwed into the gear chassis 33 from the speed reduction case 32 side (see FIG. 7). . For this purpose, bosses for screw insertion are formed at the four corners of the joint portions of the members 30, 31, and 32, and screw bosses for the screws 71 are formed at the four corners of the joint portion of the gear chassis 33.

  The vertical transmission system 58 </ b> B includes an eccentric cam 72 formed integrally with the cam gear 64 and a vibrator 73 driven to reciprocate in the left-right direction by the eccentric cam 72. In FIG. 8, the vibrator 73 includes a passive base 75 having a drive shaft 74 protruding on the upper surface, a pair of left and right mounting pieces 76, and an elastic arm 77 connecting these 75 and 76. It is prepared as one. A groove 78 that engages with the eccentric pin of the eccentric cam 72 is formed on one side of the lower surface of the passive base 75 in the front-rear direction (see FIG. 6).

  A head inner frame 34 is provided to fix and support the mounting piece 76 of the vibrator 73 and to fasten and fix the head case 35. The head inner frame 34 includes a square frame-shaped frame main body 80 and a receiving base 81 protruding from the left and right inner surfaces of the frame main body 80. The mounting pieces 76 of the vibrator 73 are engaged and mounted on the left and right pedestals 81, and the mounting pieces 76 are sandwiched and fixed by the cradle 81 and the head case 35 so as not to be movable in the front-rear, left-right, and vertical directions. As will be described later, the head inner frame 34 is fastened and fixed to the speed reduction case 32 and the motor case 30.

  In FIG. 7, the motor case 30 is made of a die-cast molded product made of aluminum, and a side frame 86 facing the side frame 47 of the speed reduction case 32 protrudes from the side end of the bottomed cylindrical main body 85. It is. A pair of rib-shaped projections 87 are provided on the front and rear sides of the inner surface of the base end of the side frame 86, and a pair of slits that engage with the projection 87 on the side wall of the head inner frame 34 that faces the projection 87. Holes 88 are formed (see FIG. 8). With the projection 87 and the hole 88 engaged, the head inner frame 34 is assembled between the both side frames 47 and 86, and the screw boss 89 provided on the side wall of the head inner frame 34 and the both side frames 47 and 86 are screwed. The head inner frame 34 can be firmly integrated with the motor case 30 and the speed reduction case 32 by tightening at. In this way, when the motor case 30 and the speed reduction case 32 are each formed of a metal die-cast product and the head inner frame 34 is mounted on the side frames 47 and 86 provided in both cases 30 and 32, both cases 30 and 32 are obtained. Compared with the case of forming with a plastic molded product, a high strength is obtained and no distortion due to heat occurs, so the structural strength of the entire head unit 2 is improved and the robustness can be increased. It is possible to well prevent deterioration in position accuracy over time and rattling due to wear.

  In FIG. 9, the head case 35 integrally includes a rectangular box-shaped cover portion 93 that opens downward, and a cover wall 94 that covers the cover 55 of the winding transmission mechanism that projects from the upper surface of the cover portion 93. It is a plastic molded product. A shaft opening 95 for passing the drive shaft 74 of the vibrator 73 is formed at the center of the upper wall of the cover portion 93, and a passage opening for passing the previous cover 55 is formed at the base end of the cover wall 94. It is. At the left and right ends of the upper wall of the cover portion 93 facing the cover wall 94, a through hole 96 for passing the side frame 86 of the previous motor case 35 is formed long in the front-rear direction. The head case 35 is assembled from the upper surface side of the head inner frame 34, and screws 98 inserted through the left and right side walls of the head case 35 are screwed into screw bosses 99 protruding from the left and right side walls of the head inner frame 34. It is integrated with the frame 34. In this assembled state, the gap between the drive shaft 74 and the shaft opening 95 is sealed with the packing 100.

  As shown in FIGS. 12 and 13, mounting portions 101 for engaging and mounting the inner blade unit 110 from the front side or the rear side are formed at four positions on the upper surface of the cover portion 93. The mounting portion 101 includes a horizontal rail 102 extending in the front-rear direction and a connecting recess 103 on the lower surface of the rail. Claw openings 104 for projecting lock claws 120 to be described later are formed at four positions on the upper surface of the cover part 93 facing the end of the rail 102. The claw opening 104 is formed in a long hole shape that is long in the left-right direction. As shown in FIG. 12, the connecting recesses 103 adjacent to each other in the front-rear direction are independently defined, and the insertion limit of the inner blade unit 110 is defined by the inner back end thereof.

  11 and 12, the main blade 26 includes a pair of front and rear inner blade units 110 and 110 attached to the head case 35 and an outer blade 111 attached to the outer blade holder 3. The inner blade unit 110 includes an H-shaped inner blade frame 112 that is long on the left and right sides, an inner blade 113 that is rotatably supported by the inner blade frame 112, and inner blade shafts that protrude from both side ends of the inner blade 113. 114 and an inner blade gear 115 fixed to one inner blade shaft 114. Engagement grooves (engagement portions) 116 that engage with the rail 102 on the previous mounting portion 101 side are provided on the left and right leg lower portions of the inner blade frame 112 so as to be opposed to the left and right. The groove wall 117 on the side fits into the connecting recess 103 below the rail 102. The front and rear inner blade units 110 can be mounted on the head case 35 by being inserted and loaded in the direction of the arrow shown in FIG. When the inner blade unit 110 is removed from the head case 35, the front and rear inner blade units 110 may be extracted in the direction opposite to the arrows.

  The inner blade 113 has a cylindrical shape formed by implanting and fixing a group of metal cutting blades in a spiral shape on the peripheral surface of a cylindrical plastic holder. The inner blade shaft 114 is rotatably supported by a metal bush (not shown) fixed to the inner blade frame 112. The outer blade 111 is a mesh blade that is retained in an inverted U shape by the outer blade holder 3.

  In order to lock the inner blade unit 110 attached to the head case 35 so that the inner blade unit 110 cannot be removed, the head unit 2 is provided with a lock mechanism. 12 and 13, the lock mechanism includes a lock claw 120 that protrudes toward the upper surface of the case through the claw opening 104, and a lock frame (slide body) 122 that is slidably supported in the left-right direction inside the head case 35. A compression coil type lock spring 123 for urging the lock frame 122, a release operation knob 124 for unlocking the lock frame 122 against the urging force of the lock spring 123, and a side frame 86 of the motor case 30. It is comprised by the guide piece 125 etc. which are fixed to the outer surface of this and which guide-support the release operation knob 124 slidably up and down.

  The lock claws 120 protrude to the upper surface side of the case through the claw openings 104 provided in the four upper walls of the cover portion 93 of the head case 35. The lock claw 120 is between a locked posture (see FIG. 14A) facing the mounting locus of the inner blade frame 112 with respect to the mounting portion 101 and an unlocking posture retracting from the mounting locus (see FIG. 14B). It is configured to be displaceable in the left-right direction within the claw opening 104, and is normally urged to move to a locked posture via a lock frame 122 by a lock spring 123 as shown in FIG.

  The lock frame 122 is a plastic including a square frame-shaped base portion 126 and a cam piece 127 that protrudes from the front and rear centers of the side frame on the side facing the release operation knob 124 and is pushed by the release operation knob 124. It is a molded product, and the lock claws 120 are integrally provided on the left and right sides of the front and rear frame portions of the base portion 126. The lock frame 122 is housed inside the head inner frame 34 and is supported so as to be slidable left and right. In this mounted state, the lock frame 122 is pressed and held by the head case 35. Engagement walls 130 are formed inwardly on the inner surfaces of the front and rear walls of the head inner frame 34, and the front and rear walls of the lock frame 122 that are fitted into the head inner frame 34 by being dropped from above into the head inner frame 34. The lower end is received. As a result, the lock frame 122 mounted in the head inner frame 34 is slidable in the left-right direction, but the engagement wall 130 prevents the lock frame 122 from coming off downward. As described above, since the head inner frame 34 is firmly fixed by the metal side frames 47 and 86, the left and right movement of the slide body 122 in the head inner frame 34 is stable. This contributes to improving the operability and stability of the locking / unlocking operation of the locking mechanism.

  As shown in FIGS. 14 and 15, the outer surface of the cam piece 127 in the left-right direction is a downward inclined plane 128. The lock spring 123 is disposed between the inner surface of the side wall of the lock frame 122 and the cradle 81, and one end of the lock spring 123 is externally fitted to a cylindrical boss 129 provided on the inner surface of the base portion 126 (see FIG. 8).

  As shown in FIG. 8, on the inner surface of the release operation knob 124, an operation protrusion 132 that pushes the cam piece 127 of the lock frame 122 and an engagement leg 133 that is guided and supported by the guide piece 125 so as to be slidable up and down are formed. It is. The guide piece 125 is made of a plastic molded product having the same shape as the side frame 86 of the motor case 30 and is fastened and fixed to the side frame 86 with the screw 90 screwed into the head inner frame 34 from the outer surface as described above. is there. The inner surface of the operation protrusion 132 facing the cam piece 127 is an overhanging inclined plane 134 corresponding to the inclination angle of the previous inclined plane 128.

  In a state where the release operation knob 124 and the guide piece 125 are assembled, the operation protrusion 132 is in contact with the cam piece 127 via both inclined planes 128 and 134 inside the side frame 86, and thus the release operation knob 124 is pushed down. When the operation projection 132 is pushed down by operating, the cam piece 127 is pushed by the inclined plane 134 and moves sideways against the urging force of the lock spring 123. As a result, the entire lock frame 122 is slid. Thus, the lock claw 120 can be switched from the locked position to the unlocked position. In this assembled state, the release operation knob 124 is positioned closer to the lower side than the lower end of the inner blade 113 (see FIG. 1). That is, the upper end of the release operation knob 124 in the normal state is closer to the lower side than the lower end of the inner blade 113.

  In a state where the inner blade unit 110 is inserted into the mounting portion 101 and attached, the pair of left and right engaging grooves 116 and the rail 102, and the groove wall 117 and the connecting recess 103 are engaged with each other as shown in FIG. is doing. Further, the engaging claw 120 of the lock frame 122 contacts the lower part of the side frame of the inner blade frame 112 to restrain the inner blade frame 110 from moving back and forth. That is, the front and rear inner blade units 110 are held and fixed so as to be immovable in all front and rear, left and right, and upper and lower directions, respectively. In this mounted state, the front and rear inner blade gears 115 are respectively upper half peripheral surfaces of the final gear 54. Is engaged with the final gear 54.

  The inner blade unit 110 can be removed from the head case 35 in order to replace the inner blade 113. In that case, as shown in FIG. 14 (b), the release operation knob 124 is pushed down against the urging force of the lock spring 123 to displace the lock claw 120 from the locked position to the unlocked position, The entire inner blade unit 110 can be separated from the head case 35 by pulling out the inner blade frame 110 in the direction opposite to the insertion direction.

  The head lower frame 36 is joined to the lower surface opening of the head case 35 and is engaged and fixed by four leg pieces 135 (see FIG. 9) protruding from the opening edge of the head case 35. Similarly, the decorative frame 37 is mounted on the inner surface of the head lower frame 36 from the lower surface side, and a pair of front and rear engagement pieces 136 provided on the lower outer surface of the cover 55 and a pair of front and rear engagement provided on the lower end of the guide piece 114. It is engaged and fixed with the joining piece 137 (see FIG. 9). As shown in FIG. 9, the float base 38 is engaged and mounted on a boss 138 provided on the lower surface of the motor case 30, and is fixed together with the case packing 39 with a screw 139 screwed into the boss 123.

  As shown in FIG. 12, the center blade 27 includes a fixed outer blade 140 having an inverted U-shaped cross section fixed to the outer blade holder 3, and a movable inner blade 141 disposed on the inner surface of the fixed outer blade 140. Yes, the movable inner blade 141 is reciprocated left and right by the drive shaft 74 of the vibrator 73 to mainly cut long hairs and hairs. The fixed outer blade 140 and the movable inner blade 141 are each formed of a slit blade having groove-shaped blade holes formed at regular intervals. A plastic interlocking piece 142 that engages with the drive shaft 74 is fixed to the inner surface of the movable inner blade 141. The outer blade holder 3 is mounted on the head case 35 from above and is locked and held by a pair of left and right lock buttons 143. When the lock button 143 is pushed against the spring 144 (see FIG. 9), the outer blade holder 3 can be removed from the head case 35 in the upward direction.

  The sliding blade 8 disposed on the back side of the main body case 1 is driven via a swing lever 145 that is provided between the vibrator 73 and the sliding blade 8 and can swing left and right. For this purpose, as shown in FIGS. 7 and 8, a driving arm 146 is integrally provided on the back surface of the passive base 75 of the vibrator 73, and an interlocking protrusion 147 provided on the upper end of the swing lever 145 is provided in the engaging groove of the driving arm 146. 148 is engaged. Further, a driving groove 149 for reciprocating the squeezing blade 8 is provided at the lower end of the swing lever 145.

  The swing lever 145 is pivotally supported by the gear chassis 33 so that it can swing left and right. As shown in FIG. 7, a lever opening 150 is formed by cutting out a part of the peripheral wall 67 on the back side of the gear chassis 33, and a swinging lever 145 is formed by a horizontal bearing frame 151 provided in the upper and lower middle portions of the lever opening 150. A pivot shaft 152 provided in the middle of the upper and lower sides is pivotally supported.

  In the head unit 2 configured as described above, the inner frame 13 is in a state where the float pins 155 protruding from the front and rear and the left and right of the float table 38 are engaged with the float grooves 156 (see FIG. 4) provided in the float frame 16. And is integrated with the main body case 1. In this assembled state, the head unit 2 is moved forward and backward, left and right, and up and down by pushing and urging the float table 38 with a spring 157 disposed between the lower surface of the float table 38 and the inner bottom of the float frame 16. Floating supported so that it can tilt to the right. A gap between the inner frame 13 and the float frame 16 and the float table 38 is sealed in a watertight manner by the case packing 39.

  The release operation knob 124 is not limited to a form in which the lock frame 122 is slid in the up-down direction and the lock frame 122 is slid in the left-right direction. In the above embodiment, the inclined plane 128 of the lock frame 122 is pushed by the inclined plane 134 provided on the inner surface of the release operation knob 124 and the lock frame 122 is slid. Alternatively, a small potch may be provided to push the inclined plane 128 on the lock frame 122 side.

Top view of the head unit Front view of electric razor Side view of electric razor Exploded perspective view of electric razor Disassembled perspective view of the body case Schematic sectional view of the head unit Exploded perspective view of the entire power transmission structure An exploded perspective view of a part of the head unit Exploded perspective view of the head unit Side view of head unit showing winding mechanism A perspective view of the head unit with the inner blade unit and outer blade holder disassembled Longitudinal side view of the head unit Top view of the head unit Diagram for explaining the operation of the locking mechanism Longitudinal front view showing the lock structure of the inner blade unit Cross-sectional plan view showing the lock structure of the inner blade unit

Explanation of symbols

2 Head unit 3 Outer blade holder 25 Motor 30 Motor case 34 Head inner frame 35 Head case 47 Side frame 54 Final gear 73 Vibrator 86 Side frame 101 Mounting portion 110 Inner blade unit 112 Inner blade frame 113 Inner blade 114 Inner blade shaft 115 Inner blade gear 116 Engagement portion 120 Lock claw 122 Slide body (lock frame)
123 Lock spring 124 Release operation knob

Claims (7)

The inner blade unit (110) is detachably attached to the head case (35) constituting the head unit (2), and the outer blade holder (3) is attached to and detached from the head case (35) in the vertical direction. Rotary electric razor
The inner blade unit (110) includes a cylindrical inner blade (113) having inner blade shafts (114) at both left and right ends, an inner blade frame (112) that rotatably supports the inner blade shaft (114), and one side An inner blade gear (115) fixed to the inner blade shaft (114) of
The head unit (2) is provided with a final gear (54) that meshes with the inner gear (115).
Mounting portions (101) for inserting and engaging the inner blade unit (110) from the front and rear direction are formed on the left and right sides of the upper surface of the head case (35). Is formed with an engaging portion (116) that engages with the mounting portion (101).
The head case (35) is provided with a lock mechanism that locks and holds the inner blade unit (110) attached to the attachment part (101) so that it cannot be removed.
The lock mechanism is provided so as to protrude upward toward the outer side in the front-rear direction of the upper surface of the head case (35), and the lock posture facing the mounting locus of the inner blade frame (112) with respect to the mounting portion (101), and the mounting locus A locking claw (120) configured to be slidable in the left-right direction between the retracted unlocking posture and a slidable movement in the left-right direction in the head case (35) is supported. A slide body (122) for displacing the lock claw (120) between the lock claw (120), a lock spring (123) for urging and moving the slide body (122) in a direction in which the lock claw (120) is in the lock posture, A release operation knob (124) for unlocking the slide body (122) against the lock spring (123) in a direction in which the (120) is in the unlocked posture.
In a state where the engaging portion (116) of the inner blade frame (110) is engaged with the mounting portion (101), the lock claw (120) in the lock posture position is engaged with the outer surface of the inner blade frame (112). The rotary electric shaver is characterized in that the inner blade unit (110) is locked and held so as not to move forward and backward.   The rotary electric shaver according to claim 1, wherein a release operation knob (124) is provided closer to the lower side than the inner blade (113) at the left and right ends of the head case (35). A pair of side frames (47) and (86) facing the left and right outer surfaces of the inner blade frame (112) protrude from the upper surface of the head case (35),
The rotary electric shaver according to claim 2, wherein a release operation knob (124) is provided on an outer surface of the one side frame (86). Inside the head case (35), a horizontally placed motor (25) and a motor case (30) which is a metal die-cast molded product for externally holding the motor (25) are assembled.
The rotary type according to claim 3, wherein a side frame (86) is integrally provided on the upper surface side of the motor case (30), and a release operation knob (124) is provided on the side frame (86). Electric razor. The rotary electric shaver according to any one of claims 2 to 4, wherein the lock claw (120) is formed integrally with the slide body (122). The rotary electric shaver according to any one of claims 2 to 5, wherein the slide body (122) is slid in the left-right direction when the release operation knob (124) is slid vertically.

A vibrator (73) for changing the rotational power of the motor (25) to the left and right reciprocating is assembled inside the head unit (2). The left and right metal side frames (47) and (86) The head inner frame (34) that supports the vibrator (73) is fastened and fixed.
The rotary electric shaver according to claim 3, wherein a slide body (122) is slidably mounted on the upper side of the head inner frame (34) in the left-right direction.

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