JP5830680B2 - Electric razor - Google Patents

Description

  The present invention includes a cylindrical case, an electric motor housed in the case, a conversion mechanism that converts rotation of the electric motor into reciprocating linear motion, and a movable blade that reciprocates linearly in conjunction with the conversion mechanism. Relates to an electric razor.

Patent Document 1 discloses an example of a conventional electric shaver.
With reference to FIG. 15, the structure of the conventional electric shaver is demonstrated.
As shown in FIG. 15A, the electric razor 100 includes a cylindrical case 130, an electric motor 110 that rotates the output shaft 111, and a conversion mechanism 120 that converts the rotation of the output shaft 111 into a reciprocating linear motion. Have In addition, a movable blade 140 that reciprocates linearly in conjunction with the conversion mechanism 120 and a blade case 150 that holds the movable blade 140 are provided. The movable blade 140 is exposed outside the blade case 150.

  As shown in FIG. 15 (b), the conversion mechanism 120 includes a gear 112 fixed to the distal end portion of the output shaft 111, a face gear 121 that meshes with the gear 112, and a rotation shaft 124 that serves as the rotation center of the face gear 121. And have. In addition, an eccentric cam 123 formed on the side surface of the face gear 121 and a driver 125 that moves relative to the face gear 121 by a force transmitted from the eccentric cam 123 are provided. The driver 125 has a groove 125 </ b> A for moving relative to the eccentric cam 123. The eccentric cam 123 is located in the groove 125 </ b> A while being in contact with the wall surface of the driver 125.

  The electric motor 110 rotates the output shaft 111 and the gear 112 when supplied with current. The face gear 121 rotates around the rotation shaft 124 by the rotation transmitted from the gear 112. The eccentric cam 123 rotates together with the face gear 121 in the groove 125 </ b> A of the driver 125. The driver 125 moves in the direction of the output shaft 111 with respect to the face gear 121 and the like as the eccentric cam 123 rotates. The movable blade 140 reciprocates linearly in conjunction with the driver 125.

JP 2002-369799 A

  Since the movement width of the reciprocating linear motion of the driver element 125 is determined by the size of the eccentric cam 123, when the eccentric cam 123 is increased in order to increase the movement width of the driver element 125, the gear portion 122 of the face gear 121 is increased. It is necessary to increase the diameter. For this reason, the case 130 becomes thick.

  An object of the present invention is to provide an electric razor that contributes to increasing the movement width of the reciprocating linear motion of the movable blade and making the case thinner.

  One form of the electric razor according to the present invention includes a cylindrical main body case, an electric motor disposed in the main body case, a conversion mechanism that converts the rotation of the output shaft of the electric motor into a reciprocating linear motion, and a longitudinal direction. A fixed blade having a plurality of blades and a plurality of slits formed alternately, a head case supporting the fixed blade and connected to the main body case, and disposed on the back side of the fixed blade in the head case, A movable blade that reciprocates linearly with respect to the fixed blade in conjunction with the conversion mechanism, the conversion mechanism is a link mechanism, and the direction of the reciprocating linear motion of the movable blade intersects the longitudinal direction of the slit. To do.

  The electric razor contributes to increasing the movement width of the reciprocating linear motion of the movable blade and making the case thinner.

FIG. 4 is a perspective view of the electric razor of the embodiment (a: the cap is not attached) B, a state in which a cap is attached). These are the figures regarding the electric shaver of FIG. 1 (a: side view, b: sectional view). FIG. 3 is an exploded perspective view of the apparatus main body of FIG. 2. FIG. 3 is an exploded perspective view of the head portion of FIG. 2. FIG. 3 is an exploded perspective view of the blade block of FIG. 2. FIG. 3 is an enlarged view of a part of FIG. 2. FIG. 3 is an operation diagram of the electric razor of FIG. 2 (a: the rotation angle of the output shaft is 0 °, b: The state of the driving device and the conversion mechanism in a, c: the rotation angle of the output shaft is 90 °, and the state of the driving device and the conversion mechanism in d: c). Is an operation diagram of the electric razor of FIG. 2 (a: the rotation angle of the output shaft is 180 °, b: the state of the drive device and the conversion mechanism in a, c: the rotation angle of the output shaft is 270 °, d: the state of the drive device and the conversion mechanism in the state of c) FIG. 2 is an enlarged view of a part of FIG. 1 (a: a state where a head part is not mounted, b: The head is attached). FIG. 3 is a cross-sectional view of the link mechanism and head portion of FIG. 2 (a: section along the axial direction; Plane, b: AA cross section of a). FIG. 11 is a cross-sectional view showing a state where the head portion of FIG. 10 is rotated (a: along the axial direction). Cross section, b: BB cross section of a). FIG. 12 is a cross-sectional view showing a state in which the head portion of FIG. 11 is rotated (a: along the axial direction). Cross section, b: CC cross section of a). FIG. 13 is a cross-sectional view showing a state where the head portion of FIG. 12 is rotated (a: along the axial direction). Cross section, b: DD cross section of a). FIG. 14 is a cross-sectional view showing a state where the head portion of FIG. 13 is rotated (a: along the axial direction). Cross section, b: cross section taken along line E-E). These are the figures regarding the conventional electric shaver (a: Whole sectional drawing, b: Converter) Perspective view).

  (An example of the form that an electric razor can take)
  [1] One embodiment of the electric razor according to the present invention is an embodiment of the electric razor according to the present invention, in which the cylindrical main body case, the electric motor disposed in the main body case, and the rotation of the output shaft of the electric motor A reciprocating linear motion, a fixed blade having a plurality of blades and a plurality of slits alternately formed in the longitudinal direction, a head case supporting the fixed blade and connected to the main body case, and the head A movable blade disposed in the case on the back side of the fixed blade and reciprocally linearly moving with respect to the fixed blade in conjunction with the conversion mechanism; the conversion mechanism is a link mechanism; The direction of linear motion and the longitudinal direction of the slit intersect.
  [2] According to an example of the electric razor, the conversion mechanism is connected to the first link by a rotation link and a first link that extracts movement in a direction orthogonal to the axial direction of the output shaft from rotation of the output shaft. A second link that extracts the movement of the output shaft in the axial direction from the movement of the first link, and the second link that is connected to the second link by a rotating pair, and the movable blade reciprocates linearly with respect to the fixed blade. Thus, a third link for transmitting the movement of the second link to the movable blade is provided.
  [3] According to an example of the electric razor, the conversion mechanism includes a first link that extracts a movement in a direction orthogonal to the axial direction of the output shaft from the rotation of the output shaft of the electric motor, and the rotation pair. It is connected to the first link, takes out the axial movement of the output shaft from the movement of the first link, and moves the movement of the first link so that the movable blade reciprocates linearly with respect to the fixed blade. A third link is provided for transmission to the blade.
  [4] According to an example of the electric shaver, the main body case includes a guide portion that guides the movement of the third link so that the third link can move in the axial direction of the output shaft.
  [5] According to an example of the electric razor, the conversion mechanism is connected to the third link, and moves the third link so that the movable blade reciprocates linearly with respect to the fixed blade. A head link is further provided.
  [6] According to an example of the electric razor, the conversion mechanism is connected to the third link, is connected to the relay member that moves in the same direction as the third link, and is connected to the relay member. A head link is further provided that transmits the movement of the relay member to the movable blade so as to reciprocate linearly with respect to the fixed blade.
  [7] According to an example of the electric razor, the connection portion between the head link and the relay member, and the connection portion between the head link and the movable blade are rotating pairs.
  [8] According to an example of the electric shaver, the connecting portion between the second link and the third link and the connecting portion between the relay member and the head link are substantially coaxial.
  [9] According to an example of the electric shaver, the first link includes a first arm connected to the output shaft, a second arm connected to the second link or the third link, and the first arm. And an intermediate portion that connects the second arm and forms a rotation axis of the first link with respect to the main body case.
  [10] According to an example of the electric razor, the relay member, the connection portion between the second link and the third link, and the connection portion between the relay member and the head link are substantially coaxial. Exists.
  [11] According to an example of the electric razor, the direction of the reciprocating linear motion of the movable blade is inclined with respect to the longitudinal direction of the main body case.
  [12] According to an example of the electric razor, the main body case further includes a cap that covers the head case and has a structure that can be attached to and detached from the main body case, and the cap is attached to the main body case. The shape formed by the cap is an elongated bar.

(Embodiment)
The configuration of the electric razor 1 will be described with reference to FIG.
As shown in FIG. 1A, the electric razor 1 includes a device main body 10 that is gripped by a user, a head portion 50 having a blade block 60 for shaving body hair, and a cap 70 that protects the head portion 50. .
As shown in FIG. 1B, the cap 70 has a structure that can be attached to and detached from the apparatus main body 10. Further, the entire head unit 50 is covered in a state of being attached to the apparatus main body 10.

Here, each direction about the electric shaver 1 is defined as follows.
(A) A direction perpendicular to the axial direction ZA in the front view is defined as a width direction ZB.
(B) A direction perpendicular to the axial direction ZA and the width direction ZB is a depth direction ZC.
(C) A direction from the apparatus main body 10 toward the head unit 50 in the axial direction ZA is defined as an upper ZA1.
(D) A direction from the head portion 50 in the axial direction ZA toward the apparatus main body 10 is defined as a downward ZA2.
(E) A direction from the front to the back of the apparatus main body 10 in the depth direction ZC is defined as a rear ZC2.
(F) A direction from the back surface to the front surface of the apparatus main body 10 in the depth direction ZC is defined as a front ZC1.

With reference to FIG. 2, the structure of the apparatus main body 10 and the head part 50 is demonstrated.
As shown in FIG. 2A, the apparatus main body 10 has a stepped portion that comes into contact with the end face of the cap 70 in FIG. 1 at an intermediate portion in the axial direction ZA. The length of the apparatus body 10 in the axial direction ZA is larger than the length of the head unit 50 in the axial direction ZA.

  As shown in FIG. 2B, the apparatus main body 10 includes a main body case 10 </ b> A having a space for accommodating various components, a secondary battery 17 that serves as a power source for the electric razor 1, and a drive source for the head unit 50. And a driving device 20. In addition to this, the conversion mechanism 30 that converts the rotation of the electric motor 21 of the drive device 20 into a reciprocating linear motion and transmits the reciprocating linear motion to the head unit 50, and the wiring member 40 that electrically connects the secondary battery 17 and the drive device 20. And have. In addition to this, a dust-proof rubber 16 that suppresses the entry of foreign matter into the apparatus main body 10 and a power switch 18 that switches between driving and stopping of the driving device 20 are provided.

  The head unit 50 includes a head case 50A having a space for accommodating various components, a blade block 60 fixed to the front surface of the head case 50A, and a lock button 55 for removing the blade block 60 from the head case 50A. Have. In addition, a relay member 54 that reciprocates linearly with the force transmitted from the conversion mechanism 30 and a head link 53 that transmits the force transmitted from the relay member 54 to the blade block 60 are provided. The relay member 54 and the head link 53 are located inside the head case 50A.

A detailed configuration of the apparatus main body 10 will be described with reference to FIG.
In addition to the drive device 20 and the like, the device main body 10 includes a contact fitting 19 that switches electrical connection and disconnection between the secondary battery 17 and the drive device 20.

  The power switch 18 includes an operation unit 18A that is operated by the user, an attachment portion 18B to which the contact fitting 19 is attached, an operation surface 18C that is located outside the main body case 10A, and a user when the power switch 18 is operated. A click portion 18D for imparting a click feeling. The power switch 18 is located in front of the apparatus main body 10.

  The main body case 10 </ b> A includes an upper ring 14 and a lower ring 15 for fixing the first case 11 and the second case 12 to each other in addition to the first case 11 to the third case 13. The main body case 10A corresponds to a “case”.

  The drive device 20 includes an electric motor 21 having an output shaft 22, a rotation member 23 having the same axis as the output shaft 22, an eccentric shaft 24 having a center line eccentric to the rotation member 23, and rotation of the drive device 20. And a roller 25 that transmits to the conversion mechanism 30. The rotating member 23 is fixed to the output shaft 22. The eccentric shaft 24 is fixed to the rotating member 23. The roller 25 is supported by the eccentric shaft 24 in a state where the roller 25 can rotate with respect to the eccentric shaft 24 and cannot move in the axial direction ZA with respect to the eccentric shaft 24.

  The center line of the eccentric shaft 24 is parallel to the direction of the center line of the output shaft 22. Further, when the operation surface 18C of the power switch 18 is regarded as a virtual plane along the axial direction ZA and the width direction ZB, it is parallel to the virtual plane.

  The conversion mechanism 30 has three links that convert the rotation of the output shaft 22 into a linear motion in the axial direction ZA, that is, the first link 31, the second link 32, the third link 33, and the rotation center of the first link 31. Support shaft 34. The conversion mechanism 30 corresponds to a “link mechanism”.

  The first link 31 includes a rotation shaft 31C that rotates around the support shaft 34, an input portion 31D that supports the roller 25, a first arm 31A that connects the input portion 31D and the rotation shaft 31C, and the rotation shaft 31C. It has the 2nd arm 31B which protrudes in the 2nd link 32 side. The inner peripheral surface of the input portion 31 </ b> D supports the roller 25 while being in contact with the outer peripheral surface of the roller 25. The second arm corresponds to an “output portion”. The rotating shaft 31C corresponds to an “intermediate portion”. The roller 25 and the input portion 31D correspond to a “transmission direction regulating mechanism”.

  The rotating shaft 31C, the input portion 31D, the first arm 31A, and the second arm 31B are formed as an integral part from the same resin material. The first arm 31A and the second arm 31B protrude in different directions in the circumferential direction of the rotation shaft 31C. The rotation shaft 31C is supported by the support shaft 34 in a state where the rotation shaft 31C can rotate with respect to the support shaft 34. The direction of the center line of the support shaft 34 is orthogonal to the direction of the center line of the eccentric shaft 24.

  The distance from the rotation shaft 31C to the tip portion of the second arm 31B (hereinafter referred to as “second distance D2”) is the distance from the rotation shaft 31C to the tip portion of the first arm 31A (hereinafter referred to as “first distance D1”). Smaller than.

  The second link 32 has a rhombus in plan view in the axial direction ZA and the depth direction ZC. The input end portion 32A of the second link 32 is connected to the second arm 31B so as to be rotatable with respect to the second arm 31B. The output end 32 </ b> B of the second link 32 is connected to the third link 33 in a state where the rotation with respect to the third link 33 is possible. As the material of the second link 32, the same resin material as that of the first link 31 is used.

  The third link 33 has a fixing plate 33A for fixing to the head unit 50 of FIG. As the material of the third link 33, the same resin material as that of the first link 31 and the second link 32 is used.

  The first case 11 includes a shaft fixing portion 11 </ b> A for fixing the support shaft 34, a shaft guide portion 11 </ b> B that guides the movement of the third link 33, and a support portion 11 </ b> C that supports the third link 33. The shaft guide portion 11B corresponds to “a guide portion that restricts the moving direction of the third link in one direction”.

  The wiring member 40 includes an anode fitting 41 connected to the anode of the secondary battery 17, a cathode fitting 42 connected to the cathode of the secondary battery 17, and a motor fitting 43 connected to the electric motor 21. In addition, a circuit board 45 that electrically connects corresponding metal fittings and a board metal fitting 44 that is electrically connected to the circuit board 45 are provided. The circuit board 45 has a current fuse 46 that cuts off the electrical connection between the electric motor 21 and the secondary battery 17 when the electric motor 21 is short-circuited. The anode fitting 41, the cathode fitting 42, the motor fitting 43, the circuit board 45, and the board fitting 44 are fixed to the first case 11.

  The anode fitting 41 is electrically connected to the electric motor 21. The cathode fitting 42 is electrically connected to the circuit board 45. The contact fitting 19 of the power switch 18 is connected to the motor fitting 43 and the board fitting 44.

  As described above, the wiring member 40 includes the anode of the secondary battery 17, the anode fitting 41, the electric motor 21, the motor fitting 43, the contact fitting 19, the board fitting 44, the circuit board 45, the cathode fitting 42, and the cathode of the secondary battery 17. An electric circuit through which current flows is formed in this order.

A detailed configuration of the head unit 50 will be described with reference to FIG.
In addition to the head case 50 </ b> A, the head unit 50 includes a relay member 54 connected to the third link 33 of the conversion mechanism 30 of FIG. 3 and a head link 53 connected to the relay member 54. In addition, a blade block 60 for shaving the body hair and a lock button 55 for removing the blade block 60 from the head case 50A are provided. The blade block 60 and the lock button 55 are located in front of the head unit 50. The lock button 55 is positioned below ZA2 of the blade block 60 in the axial direction ZA.

  The head case 50A has two cases, that is, a first case 51 and a second case 52. The first case 51 includes an insertion portion 51A inserted into the first case 11, a link guide portion 51B that guides the movement of the head link 53, and a relay guide portion 51C that guides the movement of the relay member 54.

  The insertion portion 51A has a guide groove 51D that guides the movement of the relay member 54 in the axial direction ZA. The relay guide portion 51C has a pair of walls that are opposed to each other through a gap. The link guide portion 51B has a pair of walls that are opposed to each other through a gap. The forming position of the link guide portion 51B is inclined from the front ZC1 to the rear ZC2 in the depth direction ZC as it goes from the lower ZA2 in the axial direction ZA to the upper ZA1. The second case 52 has a link guide portion (not shown) at a position corresponding to the link guide portion 51B of the first case 51.

  The relay member 54 includes a connection portion 54A connected to the head link 53, a guide portion 54B that guides the tip portion of the third link 33, and a fixed portion to which the fixing plate 33A of the third link 33 in FIG. 3 is fixed. 54C and a pair of protrusions 54D fitted in the respective guide grooves 51D.

  The head link 53 includes a relay connection portion 53A connected to the connection portion 54A of the relay member 54, a blade connection portion 53B connected to the blade block 60, and a pair of protrusions 53C that move in the link guide portion 51B. .

  The relay connection portion 53A is connected to the connection portion 54A so as to be rotatable with respect to the relay member 54. The blade connection portion 53B is connected to the blade block 60 in a state in which the blade connection portion 53B cannot rotate with respect to the blade block 60.

With reference to FIG. 5, the detailed structure of the blade block 60 is demonstrated.
The blade block 60 includes a support frame 61 that constitutes a main body of the blade block 60, a fixed blade 65 that guides body hair to a space inside the support frame 61, and a movable blade 64 that reciprocates linearly with respect to the fixed blade 65. Have. In addition to this, a mounting base 62 that supports the movable blade 64 from the inside and a pair of coil springs 63 that press the movable blade 64 against the fixed blade 65 via the mounting base 62 are provided.

  The movable blade 64 has a plurality of slits 64A. Each slit 64A has a shape extending in the width direction ZB. The fixed blade 65 has a plurality of slits 65A. Each slit 65A has a shape extending in the width direction ZB.

  The support frame 61 includes a fixed portion 61A that determines the position of the end of the coil spring 63 with respect to the support frame 61, a fixed portion 61B that determines the position of the fixed blade 65 with respect to the support frame 61, a fixed blade 65, and a movable blade 64. An arrangement space 61C.

  The mounting base 62 includes a fixed portion 62A that determines the position of the end of the coil spring 63 relative to the mounting base 62, a fixed portion 62B that determines the position of the movable blade 64 relative to the mounting base 62, and a contact that moves on the wall surface of the support frame 61. 62C.

  The fixed blade 65 is fixed to the support frame 61. The movable blade 64 is fixed to the mounting base 62. The fixed portion 61 </ b> A of the support frame 61 is inserted into one end of the coil spring 63. The fixed portion 62 </ b> A of the mounting base 62 is inserted into the other end of the coil spring 63.

  Each coil spring 63 is positioned between the support frame 61 and the mounting base 62 in a compressed and deformed state. The restoring force of each coil spring 63 acts in the direction of pushing the movable blade 64 toward the fixed blade 65. For this reason, the outer surface of the movable blade 64 is in contact with the back surface of the fixed blade 65.

  The set of the movable blade 64 and the mounting base 62 can move in the axial direction ZA with respect to the set of the fixed blade 65 and the support frame 61. Each coil spring 63 maintains the state in which the fixed portion 61A and the fixed portion 62A are inserted into the end portions when the set of the movable blade 64 and the mounting base 62 moves relative to the fixed blade 65 and the support frame 61. Deformation in the axial direction ZA.

With reference to FIG. 6, the relationship of each component of the electric shaver 1 is demonstrated.
(A) The roller 25 is connected to the input portion 31 </ b> D of the first link 31.
(B) The second arm 31 </ b> B of the first link 31 is connected to the second link 32.
(C) The output side end of the second link 32 is connected to the third link 33.
(D) The fixed plate 33 </ b> A of the third link 33 is connected to the relay member 54.
(E) The connecting portion 54 </ b> A of the relay member 54 is connected to the head link 53.
(F) The blade connection portion 53 </ b> B of the head link 53 is connected to the blade block 60.

  Since the electric razor 1 has the above connection relationship, after the rotation of the output shaft 22 of the electric motor 21 is converted into the reciprocating linear motion by the converting mechanism 30, the reciprocating linear motion of the converting mechanism 30 is converted into the relay member 54 and the head link. This is transmitted to the blade block 60 via 53.

  The operation of the electric shaver 1 will be described with reference to FIGS. 7 and 8 show a cross-sectional structure of the head unit 50 in which the configuration of the blade block 60 and the configuration of the inner surface of the first case 51 related to the blade block 60 are simplified. The depth direction ZC corresponds to the “first axis”. The width direction ZB corresponds to the “second axis”.

  The movable blade 64 moves in a predetermined direction (hereinafter referred to as “blade movement direction W”) with respect to the fixed blade 65 on the plane of the axial direction ZA and the depth direction ZC as the electric motor 21 rotates. The link guide portion 51B has a shape for guiding the protrusion 53C of FIG. The blade moving direction W has a predetermined inclination angle with respect to the axial direction ZA on the planes of the axial direction ZA and the depth direction ZC. In the following description, the direction on the upper ZA1 side of the axial direction ZA in the blade movement direction W is referred to as a “pushing direction WA”, and the direction on the lower ZA2 side of the axial direction ZA is referred to as a “pulling direction WB”.

  The position of the movable blade 64 with respect to the fixed blade 65 (hereinafter referred to as “blade relative position”) ranges from the “maximum push position” that is the limit position in the push direction WA to the “maximum pull position” that is the limit position in the pull direction WB. It changes with.

  FIG. 7A shows an operating state of the head unit 50 when the blade relative position is the maximum pressing position. Moreover, FIG.7 (c) has shown the operation state of the roller 25 and the 1st link 31 corresponding to this operation state.

  FIG. 8A shows the operating state of the head unit 50 when the blade relative position is the maximum pulling position. Moreover, FIG.8 (c) has shown the operation state of the roller 25 and the 1st link 31 corresponding to this operation state.

  FIGS. 7B and 8B show the operating state of the head unit 50 when the blade relative position is an intermediate point between the maximum pressing position and the maximum pulling position. Moreover, FIG.7 (d) and FIG.8 (d) have shown the operation state of the roller 25 and the 1st link 31 corresponding to this operation state.

  Detailed operations of the conversion mechanism 30 and the head unit 50 will be described. Hereinafter, regarding the rotation direction R around the predetermined axis in the plane of the axial direction ZA and the depth direction ZC, the clockwise rotation direction is referred to as “forward rotation direction R1”, and the counterclockwise rotation direction is referred to as “reversal direction R2”. .

(1) “Change from the state of FIG. 7A to the state of FIG. 7C”
When the output shaft 22 of the electric motor 21 rotates from the rotational position of FIG. 7B to the rotational position of FIG. 7D, each component of the conversion mechanism 30 and the head unit 50 starts from the state of FIG. The operation is performed up to the state of FIG. The specific operation of each component at this time is shown below.

  The roller 25 moves in the width direction ZB with respect to the input portion 31D by rotating together with the output shaft 22. For this reason, the input portion 31D receives a force acting in the depth direction ZC from the roller 25 and does not receive a force acting in the width direction ZB from the roller 25.

  For this reason, the state of each component of the conversion mechanism 30 changes from the state of FIG. 7A to the state of FIG. That is, the input portion 31D and the first arm 31A rotate the rotation shaft 31C around the support shaft 34 in the reverse direction R2 in plan view in the axial direction ZA and the depth direction ZC. The second arm 31B rotates in the reverse direction R2 around the support shaft 34 as the rotation shaft 31C rotates in a plan view in the axial direction ZA and the depth direction ZC.

  The input end 32A of the second link 32 is attracted to the lower ZA2 by the second arm 31B while rotating with respect to the second arm 31B as the second arm 31B rotates. For this reason, the 2nd link 32 is pulled near to the rotating shaft 31C side by the 2nd arm 31B as a whole. That is, it moves downward ZA2 with respect to the main body case 10A.

  The third link 33 moves to the lower ZA2 with respect to the main body case 10A as the second link 32 moves to the lower ZA2. That is, it moves in the direction away from the head unit 50 in the axial direction ZA.

  The relay member 54 moves to the lower ZA2 with respect to the head case 50A as the third link 33 moves to the lower ZA2. That is, it moves from the head unit 50 side to the apparatus main body 10 side in the axial direction ZA.

  The head link 53 is pulled toward the apparatus main body 10 by the relay member 54 as the relay member 54 moves downward ZA2. At this time, the protrusion 53C of the head link 53 of FIG. 4 moves in the pulling direction WB of the blade moving direction W by contact with the link guide portion 51B. For this reason, the blade connection portion 53B of the head link 53 also moves in the pulling direction WB.

  The movable blade 64 moves in the pulling direction WB relative to the head case 50A and the fixed blade 65 as the blade connecting portion 53B moves in the pulling direction WB. That is, when the electric motor 21 rotates from the rotational position of FIG. 7B to the rotational position of FIG. 7D, the blade relative position changes from the position of FIG. 7A to the position of FIG. 7C. .

(2) “Change from the state of FIG. 7C to the state of FIG. 8A”
When the output shaft 22 of the electric motor 21 rotates from the rotational position shown in FIG. 7D to the rotational position shown in FIG. 8B, the components of the conversion mechanism 30 and the head unit 50 start from the state shown in FIG. The operation is performed up to the state of FIG. Each component at this time operates in the same manner as when operating from the state of FIG. 7A to the state of FIG.

  The movable blade 64 moves in the pulling direction WB relative to the head case 50A and the fixed blade 65 as the blade connecting portion 53B moves in the pulling direction WB. That is, the blade relative position changes from the position shown in FIG. 7C to the maximum pulling position shown in FIG.

(3) “Change from the state of FIG. 8A to the state of FIG. 8C”
When the output shaft 22 of the electric motor 21 rotates from the rotational position shown in FIG. 8B to the rotational position shown in FIG. 8D, each component of the conversion mechanism 30 and the head unit 50 starts from the state shown in FIG. The operation is performed up to the state of FIG. The specific operation of each component at this time is shown below.

  The roller 25 moves in the width direction ZB with respect to the input portion 31D by rotating together with the output shaft 22. For this reason, the state of each component of the conversion mechanism 30 changes from the state of FIG. 8A to the state of FIG. That is, the input portion 31D and the first arm 31A rotate the rotation shaft 31C around the support shaft 34 in the normal rotation direction R1 in a plan view in the axial direction ZA and the depth direction ZC. The second arm 31B rotates in the forward rotation direction R1 around the support shaft 34 as the rotation shaft 31C rotates in a plan view in the axial direction ZA and the depth direction ZC.

  The input end 32A of the second link 32 is pushed out upward ZA1 by the second arm 31B while rotating with respect to the second arm 31B as the second arm 31B rotates. For this reason, the 2nd link 32 is extruded to the head part 50 side by the 2nd arm 31B as a whole. That is, it moves upward ZA1 with respect to the main body case 10A.

  The third link 33 moves to the upper ZA1 with respect to the main body case 10A as the second link 32 moves to the upper ZA1. That is, it moves in a direction approaching the head unit 50 in the axial direction ZA.

The relay member 54 moves to the upper ZA1 with respect to the head case 50A as the third link 33 moves to the upper ZA1. That is, it moves from the apparatus main body 10 side to the head unit 50 side in the axial direction ZA.

  The head link 53 is pushed toward the head portion 50 by the relay member 54 as the relay member 54 moves to the upper ZA1. At this time, the protrusion 53C of the head link 53 in FIG. 4 moves in the pushing direction WA in the blade moving direction W by contact with the link guide portion 51B. For this reason, the blade connection part 53B of the head link 53 also moves in the pushing direction WA.

  The movable blade 64 moves in the pushing direction WA with respect to the head case 50A and the fixed blade 65 as the blade connecting portion 53B moves in the pushing direction WA. That is, when the electric motor 21 rotates from the rotation position of FIG. 8B to the rotation position of FIG. 8D, the blade relative position changes from the position of FIG. 8A to the position of FIG. 8C. .

(4) “Change from the state of FIG. 8C to the state of FIG. 7A”
When the output shaft 22 of the electric motor 21 rotates from the rotational position shown in FIG. 8D to the rotational position shown in FIG. 7B, each component of the conversion mechanism 30 and the head unit 50 starts from the state shown in FIG. The operation is performed up to the state of FIG. Each component at this time operates in the same manner as when operating from the state of FIG. 8A to the state of FIG.

  The movable blade 64 moves in the pushing direction WA with respect to the head case 50A and the fixed blade 65 as the blade connecting portion 53B moves in the pushing direction WA. That is, the blade relative position changes from the position shown in FIG. 8C to the maximum pressed position shown in FIG.

With reference to FIG. 9, the assembly procedure of the head unit 50 will be described.
The user attaches the head unit 50 to the apparatus main body 10 according to the following procedure.
As shown in FIG. 9A, the user arranges each component at a position where the insertion portion 51A of the head portion 50 and the opening portion of the apparatus main body 10 face each other. Further, the rotation center axis of the head unit 50 and the rotation center axis of the apparatus main body 10 are matched.

  As shown in FIG. 9B, the user inserts the insertion portion 51 </ b> A of the head unit 50 into the apparatus main body 10. Next, the head unit 50 is rotated in a specified direction with respect to the apparatus main body 10. Thereby, the head unit 50 is fixed to the apparatus main body 10.

  With reference to FIGS. 10-14, the relationship between the 3rd link 33 and the relay member 54 at the time of attachment of the head part 50 with respect to the apparatus main body 10 is demonstrated. 10 to 14 show the relationship between the third link 33 and the head unit 50 in a state in which the head unit 50 is attached to the apparatus main body 10. Further, parts other than the third link 33 are omitted from the apparatus main body 10. Further, the second case 52 is omitted from the head unit 50.

  (A) As shown in FIG. 10A, in the relay member 54, when the insertion portion 51A is inserted into the apparatus main body 10, the fixing plate 33A of the third link 33 is inserted into the guide portion 54B. As shown in FIG. 10B, the inner surface of the guide portion 54B faces the side surface of the fixed plate 33A via a gap.

  (B) As shown in FIG. 11 (b), the head unit 50 rotates with respect to the apparatus body 10 from the rotational position of FIG. 10. As shown in FIG. 11A, the relay member 54 is configured such that the third link 33 rotates while rotating with respect to the third link 33 by the fixing plate 33A being pressed against the guide portion 54B as the head case 50A rotates. Move downward ZA2.

  (C) As shown in FIG. 12B, the head unit 50 further rotates from the rotation position of FIG. As shown in FIG. 12A, the relay member 54 continues to rotate with respect to the third link 33 as the fixing plate 33A is further pressed against the guide portion 54B as the head case 50A rotates. The link 33 moves downward ZA2.

  (D) As shown in FIG. 13B, the head unit 50 further rotates from the rotation position of FIG. As shown in FIG. 13 (a), the relay member 54 is configured such that the guide portion 54B is further pressed against the fixed plate 33A as the head case 50A rotates, and the third member 33 continues to rotate with respect to the third link 33. The link 33 moves downward ZA2. At this time, the bottom surface of the fixed portion 54C is abutted against the fixed plate 33A as the lower ZA2 moves. As shown in FIG. 13B, a part of the fixed portion 54C overlaps the fixed plate 33A in the axial direction ZA.

  (E) As shown in FIG. 14B, the head unit 50 further rotates from the rotation position of FIG. 13 with respect to the apparatus main body 10. As shown in FIG. 14A, the relay member 54 continues to rotate with respect to the third link 33 in a state where the bottom surface of the fixing portion 54C is pressed against the fixing plate 33A as the head case 50A rotates. At this time, as shown in FIG. 14B, the relay member 54 rotates until the entire both ends of the fixing plate 33A are fitted into the fixing portion 54C. When the rotation position of the relay member 54 with respect to the third link 33 reaches the rotation position shown in FIG. 14B, the assembly work of the head unit 50 with respect to the apparatus main body 10 is completed.

(Effect of embodiment)
The electric shaver 1 of the present invention has the following effects.
(1) A conventional electric shaver 100 shown in FIG. 15 has a configuration in which a thin plate-like movable blade 140 and a fixed blade (not shown) are exposed from a blade case 150. For this reason, the movable blade 140 can appropriately cut the hair even if the movement width of the reciprocating linear motion is small.

  On the other hand, an electric razor having a structure having a fixed blade as an outer blade and a movable blade as an inner blade (hereinafter referred to as “built-in razor”) is known in order to make the skin contact with the user softer.

  One form of the built-in razor has a fixed blade in which a large number of introduction holes are formed in a thin plate-shaped metal piece. Since this built-in type razor cuts the hair introduced into the introduction hole short, it is necessary to make the fixed blade thin. However, when the fixed blade is thinned, the rigidity required for the fixed blade may not be maintained.

  Therefore, a measure to increase the thickness of the metal piece can be considered to ensure the rigidity of the fixed blade. However, when this measure is adopted, another problem arises that the amount of body hair introduced into the introduction hole is reduced when shaving the body hair. As a method for solving this problem, there is a method in which a plurality of slits are formed in a metal piece instead of a plurality of introduction holes.

  The fixed blade having a plurality of slits solves the above problem, but the width of the slit in the short direction is larger than the diameter of the introduction hole, so that the moving width of the reciprocating linear motion of the movable blade relative to the fixed blade is increased. Is required.

  In order to meet this requirement, it is conceivable to use the conversion mechanism 120 of the conventional electric razor 100 as the conversion mechanism of the built-in razor having the slit. On the other hand, the conversion mechanism 120 needs to increase the diameter of the face gear 121 in order to increase the movement width of the reciprocating linear motion of the eccentric cam 123.

  For this reason, in the built-in razor using the conversion mechanism 120, when the movement width of the reciprocating linear motion of the movable blade is increased, it is difficult to reduce the thickness of the main body as the face gear 121 is enlarged.

  The electric razor 1 of the present embodiment has a mechanism constituted by a link mechanism as the conversion mechanism 30 that converts the rotational motion of the electric motor 21 into the reciprocating linear motion of the movable blade 64. According to this configuration, as compared with the conventional conversion mechanism 120 having the face gear 121, the movement width of the reciprocating linear motion required for the movable blade 64 is ensured even if the dimension of the conversion mechanism 30 in the width direction ZB is reduced. It becomes possible to do. For this reason, the apparatus main body 10 can be made thin. That is, the conversion mechanism 30 contributes to increasing the movement width of the reciprocating linear motion of the movable blade 64 and narrowing the case. Further, since the gear is not provided, a gear meshing sound does not occur with the operation of the conversion mechanism 30. For this reason, a driving sound becomes smaller than the conventional conversion mechanism 120. FIG.

  (2) The second arm 31B extends in a direction different from the first arm 31A with the rotation shaft 31C as a fulcrum. According to this configuration, compared with a configuration in which the first arm 31A and the second arm 31B extend in the same direction with the rotation shaft 31C as a fulcrum, that is, the configuration in which the first link 31 is formed linearly, In the axial direction ZA, the swinging width of the second arm 31B increases as the first arm 31A swings. For this reason, the movement width of the reciprocating linear motion of the movable blade 64 is increased.

  (3) The center line of the eccentric shaft 24 is parallel to the operation surface 18C of the power switch 18. According to this configuration, the axial length of the eccentric shaft 24 is not restricted by the relationship with the operation surface 18C. For this reason, the freedom degree about the shape of the eccentric shaft 24 becomes high.

  (4) The second distance D2 of the first link 31 is smaller than the first distance D1. According to this configuration, the force for moving the second link 32 by the reciprocating linear motion of the first link 31 is increased as compared with the configuration in which the second distance D2 is equal to or greater than the first distance D1. For this reason, the force which moves the movable blade 64 becomes large.

  (5) The head unit 50 has a structure that can be attached to and detached from the apparatus main body 10. According to this configuration, the head unit 50 can be cleaned with the head unit 50 removed from the apparatus main body 10.

  (6) The head unit 50 has a lock button 55 for removing the blade block 60. According to this configuration, the blade block 60 and the head unit 50 can be cleaned with the blade block 60 removed from the head unit 50.

  (7) The electric razor 1 has a current fuse 46 that cuts off the power supply from the secondary battery 17 to the electric motor 21. According to this configuration, when the electric motor 21 is short-circuited, the current supply from the secondary battery 17 to the electric motor 21 is interrupted by the operation of the current fuse 46. For this reason, it is suppressed that an overcurrent flows into the electric motor 21.

  (8) The apparatus main body 10 of the electric razor 1 has a dustproof rubber 16. According to this configuration, water, dust, and the like are prevented from entering the inside of the apparatus main body 10 through the gaps between the first case 11 and the second case 12 and the third link 33.

(Other embodiments)
The present invention includes embodiments other than the above-described embodiment. Hereinafter, the modification of embodiment as other embodiment of the present invention is shown. The following modifications can be combined with each other.

  -The conversion mechanism 30 of the said embodiment (FIG. 6) has the 1st link 31, the 2nd link 32, and the 3rd link 33. FIG. On the other hand, the second conversion link 32 is omitted in the conversion mechanism 30 of the modification. In this configuration, the second arm 31B of the first link 31 is connected to the third link 33 in a rotatable state.

  -The conversion mechanism 30 of the said embodiment (FIG. 6) has the 1st link 31 whose 2nd distance D2 is larger than 1st distance D1. On the other hand, the conversion mechanism 30 of the modified example includes a first link 31 having a second distance D2 that is equal to or smaller than the first distance D1. This configuration has the effects (1) to (3) and (5) to (8) of the above embodiment.

  -The apparatus main body 10 of the said embodiment (FIG. 6) has the roller 25 in the eccentric shaft 24, and has the input part 31D in the 1st link 31. As shown in FIG. On the other hand, the apparatus main body 10 of the modified example has an input portion having a function equivalent to that of the input portion 31 </ b> D in the eccentric shaft 24 and a roller having a function equivalent to the roller 25 in the first link 31. The input portion and the roller have the same relationship as the roller 25 and the input portion 31D.

  In the conversion mechanism 30 of the above embodiment (FIG. 6), the direction of the center line of the support shaft 34 is parallel to the width direction ZB. On the other hand, in the conversion mechanism 30 of the modified example, the direction of the center line of the support shaft 34 is parallel to the depth direction ZC. When the output shaft 22 of the electric motor 21 rotates, the first arm 31A having this configuration reciprocates linearly in the width direction ZB with the rotation shaft 31C as a fulcrum.

  -The blade block 60 of the said embodiment (FIG. 6) has the head link 53 and the relay member 54. FIG. On the other hand, the relay member 54 is omitted from the modified blade block 60. Further, the head link 53 is connected to the third link 33 in a state where the rotation with respect to the third link 33 is possible.

  In the blade block 60 of the above embodiment (FIG. 5), the direction of the reciprocating linear motion of the movable blade 64 is orthogonal to the longitudinal direction of the slit 65A of the fixed blade 65. On the other hand, in the modified blade block 60, the longitudinal direction of the slit 65A of the fixed blade 65 and the direction of the reciprocating linear motion of the movable blade 64 intersect at an angle different from orthogonal. As an example of this configuration, the longitudinal direction of the slit 65 </ b> A of the fixed blade 65 is inclined with respect to the direction of the reciprocating linear motion of the movable blade 64.

  In the above embodiment (FIG. 3), the eccentric shaft 24 of the driving device 20 is fixed to the rotating member 23. On the other hand, the drive device 20 of the modified example has a rotating member having a structure in which the rotating member 23 and the eccentric shaft 24 are integrated instead of the rotating member 23 and the eccentric shaft 24. This rotating member has the same function as the rotating member 23 and the eccentric shaft 24. In addition, the integrated structure shows the structure formed as a single member with the same material.

  In the above embodiment (FIG. 3), the rotating member 23 of the driving device 20 is fixed to the output shaft 22. On the other hand, the driving device 20 of the modified example has an output shaft having a structure in which the output shaft 22 and the rotating member 23 are integrated, instead of the output shaft 22 and the rotating member 23. This output shaft has functions equivalent to the output shaft 22 and the rotating member 23. In addition, the integrated structure shows the structure formed as a single member with the same material.

In the above embodiment (FIG. 6), the support shaft 34 has a center line direction parallel to the virtual plane of the operation surface 18C of the power switch 18. On the other hand, the electric shaver 1 according to the modified example has a support shaft whose center line is orthogonal to the virtual plane of the operation surface 18 </ b> C, instead of the support shaft 34. In addition, a power switch 18 is provided on the side of the first case 11 in the width direction ZB. The support shaft of this modification has the same function as the support shaft 34.
-The electric shaver 1 of the said embodiment (FIG. 9) has the structure which can attach the head part 50 to the apparatus main body 10, and can remove the head part 50 from the apparatus main body 10. FIG. On the other hand, in the electric razor 1 of the modified example, the head unit 50 is integrated with the apparatus main body 10.

  (Additional note regarding means for solving the problem)
  [Appendix 1] A cylindrical main body case, an electric motor accommodated in the main body case, a conversion mechanism that converts the rotation of the electric motor into a reciprocating linear motion, and a movable that reciprocates linearly in conjunction with the conversion mechanism In an electric razor having a blade,
  The conversion mechanism is a link mechanism that converts the rotation of the electric motor into the reciprocating linear motion;
  Having a fixed blade formed with a slit facing the movable blade;
  And the direction of the reciprocating linear motion of the movable blade intersects the longitudinal direction of the slit.
  An electric razor characterized by.
  [Appendix 2]
  In the electric razor described in appendix 1,
  The conversion mechanism includes a first link that converts the rotation of the output shaft of the electric motor into a reciprocating linear motion in a direction perpendicular to the output shaft, and the reciprocating linear motion of the first link is converted into a reciprocating linear motion of the movable blade. Having a second link to convert
  An electric razor characterized by.
  [Appendix 3]
  In the electric razor described in Appendix 2,
  Having an eccentric shaft having a center line eccentric with respect to the output shaft;
  The first link includes an output portion connected to the second link in a state capable of rotating with respect to the second link, and an input portion connected to the eccentric shaft in a state capable of rotating with respect to the eccentric shaft. Having
  An electric razor characterized by.
  [Appendix 4]
  In the electric razor described in appendix 3,
  A coordinate axis of a plane perpendicular to the center line of the eccentric axis is a first axis and a second axis,
  The conversion mechanism transmits a component acting in the direction of the first axis among rotation components of the eccentric shaft to the input portion of the first link, and the second shaft among rotation components of the eccentric shaft. A transmission direction restricting mechanism that does not transmit a component acting in the direction to the input portion of the first link.
  An electric razor characterized by.
  [Appendix 5]
  In the electric razor according to appendix 3 or 4,
  The conversion mechanism has a third link for transmitting the reciprocating linear motion of the second link to the movable blade;
  In addition, the main body case has a guide portion that regulates the moving direction of the third link in one direction.
  An electric razor characterized by.
  [Appendix 6]
  In the electric shaver according to any one of appendices 3 to 5,
  The first link has an intermediate portion connecting the input portion and the output portion to each other;
  The intermediate portion has a center of rotation of the first link;
  In addition, the output portion has a shape extending in a direction different from the input portion in a plane orthogonal to the rotation center of the intermediate portion.
  An electric razor characterized by.

  1: Electric razor
  10: Device main body
  10A: Body case
  11: First case
  11A: Shaft fixing part
  11B: Shaft guide part (guide part)
  11C: support part
  12: Second case
  13: Third case
  14: Upper ring
  15: Lower ring
  16: Dust-proof rubber
  17: Secondary battery
  18: Power switch
  18A: Operation unit
  18B: Mounting portion
  18C: Operation surface
  18D: Click part
  19: Contact bracket
  20: Drive device
  21: Electric motor
  22: Output shaft
  23: Rotating member
  24: Eccentric shaft
  25: Roller (transmission direction regulating mechanism)
  30: Conversion mechanism (link mechanism)
  31: First link
  31A: First arm
  31B: 2nd arm (output part)
  31C: Rotating shaft (intermediate part)
  31D: Input portion (transmission direction regulating mechanism)
  32: Second link
  32A: Input end
  32B: Output end
  33: Third link
  33A: Fixed plate
  34: Support shaft
  40: Wiring member
  41: Anode fitting
  42: Cathode fitting
  43: Motor bracket
  44: PCB bracket
  45: Circuit board
  46: current fuse
  50: Head portion
  50A: Head case
  51: First case
  51A: Insertion part
  51B: Link guidance part
  51C: Relay guidance part
  51D: Guide groove
  52: Second case
  53: Head link
  53A: Relay connection part
  53B: Blade connection part
  53C: protrusion
  54: Relay member
  54A: Connection part
  54B: Guide part
  54C: Fixed part
  54D: protrusion
  55: Lock button
  60: Blade block
  61: Support frame
  61A: Fixed part
  61B: Fixed part
  61C: Arrangement space
  62: Mounting base
  62A: Fixed part
  62B: Fixed portion
  62C: contact portion
  63: Coil spring
  64: Movable blade
  64A: Slit
  65: Fixed blade
  65A: Slit
  70: Cap
  110: Electric motor
  111: Output shaft
  112: Gear
  120: Conversion mechanism
  121: Face gear
  122: Gear portion
  123: Eccentric cam
  124: Rotating shaft
  125: Driving element
  125A: groove
  130: Case
  140: Movable blade
  150: Blade case
  D1: First distance
  D2: Second distance
  R: Direction of rotation
  R1: Forward rotation direction
  R2: Reverse direction
  W: Direction of blade movement
  WA: Push direction
  WB: Pull direction
  ZA: axial direction
  ZA1: Upward
  ZA2: downward
  ZB: width direction
  ZC: Depth direction
  ZC1: forward
  ZC2: Back

Claims (12)

  A cylindrical body case;
  An electric motor disposed in the body case;
  A conversion mechanism for converting the rotation of the output shaft of the electric motor into a reciprocating linear motion;
  A fixed blade comprising a plurality of blades and a plurality of slits alternately formed in the longitudinal direction;
  A head case supporting the fixed blade and connected to the main body case;
  A movable blade that is disposed on the back side of the fixed blade in the head case, and reciprocates linearly with respect to the fixed blade in conjunction with the conversion mechanism;
  The conversion mechanism is a link mechanism;
  The direction of the reciprocating linear motion of the movable blade intersects the longitudinal direction of the slit.
  Electric razor.   The conversion mechanism is connected to the first link by a first link that takes out motion in a direction orthogonal to the axial direction of the output shaft from rotation of the output shaft, and is connected to the first link by a rotational pair, and from the motion of the first link, the output shaft A second link for taking out the axial movement of the second link, and the second link connected to the second link by a rotating pair, so that the movable blade reciprocates linearly with respect to the fixed blade. With a third link to communicate to
  The electric razor according to claim 1.   The conversion mechanism is connected to the first link by a rotation pair to extract movement in a direction orthogonal to the axial direction of the output shaft from rotation of the output shaft of the electric motor, A third link is provided that extracts the movement of the output shaft in the axial direction from the movement and transmits the movement of the first link to the movable blade so that the movable blade reciprocates linearly relative to the fixed blade.
  The electric razor according to claim 1.   The main body case includes a guide portion that guides the movement of the third link so that the third link can move in the axial direction of the output shaft.
  The electric shaver according to claim 2 or 3.   The conversion mechanism further includes a head link that is connected to the third link and transmits the movement of the third link to the movable blade so that the movable blade reciprocates linearly with respect to the fixed blade.
  The electric shaver according to claim 3 or 4.   The conversion mechanism is connected to the third link and is connected to the relay member that moves in the same direction as the third link, and the relay member is connected to the relay member so that the movable blade moves back and forth linearly with respect to the fixed blade. A head link for transmitting the movement of the relay member to the movable blade is further provided.
  The electric shaver according to claim 3 or 4.   The connection portion between the head link and the relay member, and the connection portion between the head link and the movable blade are rotational pairs.
  The electric shaver according to claim 6.   The connection part between the second link and the third link and the connection part between the relay member and the head link are substantially coaxial.
  The electric shaver according to claim 6 or 7, which refers to claim 2.   The first link connects the first arm connected to the output shaft, the second arm connected to the second link or the third link, and connects the first arm and the second arm, and the main body case. An intermediate portion forming a rotational axis of the first link relative to
  The electric shaver according to any one of claims 2 to 8.   The relay member, the connection portion between the second link and the third link, and the connection portion between the relay member and the head link are substantially coaxial.
  The electric shaver according to claim 9, which refers to claim 8.   The direction of the reciprocating linear movement of the movable blade is inclined with respect to the longitudinal direction of the main body case.
  The electric shaver according to any one of claims 1 to 10.   A cap that covers the head case and has a structure that can be attached to and detached from the main body case;
  In a state where the cap is attached to the main body case, the shape formed by the main body case and the cap is an elongated rod shape.
  The electric shaver according to any one of claims 1 to 11.

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