JP2007209612A - Shearing blade unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shearing blade unit capable of exerting a favorable cutting quality for a long period of time and improving the cutting efficiency by uniformly pushing and energizing a movable blade to closely stick to a stationary blade across a whole stroke area of a cutting blade sliding surface. <P>SOLUTION: This shearing blade unit is constituted of the stationary blade 40, the movable blade 41 and a clamping spring 42 using a spring plate material as a raw material. The clamping spring 42 consists of a base wall 70 and a spring wall 71 which are opposed to each other, and a connecting arm 72 connecting the both walls 70 and 71 together. An operation part 73 provided at a free end side of the sprig wall 71 pushes the movable blade 41 across the almost whole width of the cutting blade sliding face 45 of the stationary blade 40 to eliminate the local concentration of the spring force. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shear blade unit including a fixed blade, a movable blade, and a clamping spring that presses the movable blade against the fixed blade. The shearing blade unit is applied to, for example, an electric razor sharp razor blade, a trimming blade, or a clipper blade.

  A typical clipper blade is composed of a fixed blade, a movable blade, a presser spring, and the like. Conventional presser springs are often formed as torsion coil springs using spring wire as the raw material, but since the movable blade is pressed in the form of dots with the presser claw at the tip of the spring arm, the pressing force of the spring arm causes the presser claw to press. Concentrate in the vicinity of For this reason, the blade wall that receives the pressing force is recessed in a partial spherical shell shape toward the fixed blade side, but the cutting edge is lifted from the sliding surface of the cutting blade and the sharpness is reduced. Cheap. Moreover, since the spring arm follows the reciprocating motion of the movable blade while swinging and deforming left and right, a force in the direction of tilting always acts on the movable blade.

  In the shear blade unit of the present invention, in order to solve the problem of the presser spring formed of the spring wire as described above, the presser spring is formed of a spring plate material. It is well known. The presser spring of Patent Document 1 includes a rectangular base wall and a pair of left and right spring arms that are bent into a U-shaped cross section continuously at both ends of the base wall. A V-shaped presser claw is formed on the upper free end of the spring arm, and a V-shaped groove is formed on the upper surface of the drive piece corresponding to the presser claw. The lower free end of the spring arm is engaged with the fixed blade.

  The presser spring of Patent Document 2 is composed of a horizontally long base wall that is fixed to a fixed blade with rivets, and a pair of left and right spring arms that are bent at the front portions on both sides of the base wall. A V-shaped presser claw is formed at the free end of the spring arm, and the drive piece attached to the movable blade is pressed by this presser claw.

JP 51-42660 (right column of page 1, Fig. 1) Japanese Patent Laid-Open No. 51-141069 (left column of page 1, Fig. 1)

  In Patent Documents 1 and 2, the movable blade is brought into close contact with the fixed blade by pressing the drive piece attached to the movable blade with a pair of left and right presser springs. As described above, the spring structure that locally presses the two upper surfaces of the movable blade can increase the contact length of the presser claw as compared to the presser spring formed of the spring wire material, but the pressing force by the spring arm still remains. Inevitably, the contact pressure on the sliding surface of the movable blade and the fixed blade tends to vary. Specifically, the surface pressure of the cutting blade sliding surface located far from the presser claw is reduced, and as a result, the cutting blade portion of the movable blade, especially the side edge portion, is easily lifted away from the cutting blade sliding surface. Sharpness decreases.

  In the clipper blade of Patent Document 1, the drive piece and the movable blade are slidably guided and supported by pressing the V-shaped groove with the left and right press claws provided at the free end of the spring arm. That is, the pair of spring arms also serves as a guide body for slidingly guiding the movable blade, and an essential guide structure is omitted in a general clipper blade. Therefore, when the movable blade is reciprocated left and right by the drive shaft, the spring arm is twisted and the posture of the movable blade is easy to tilt. The sliding resistance increases and the power loss increases.

  The object of the present invention is to uniformly press and bias the movable blade against the fixed blade over almost the entire stroke range of the cutting blade sliding surface. An object of the present invention is to provide a shearing blade unit that exhibits good sharpness and can improve cutting efficiency.

  The shear blade unit of the present invention includes a fixed blade 40, a movable blade 41, a sandwiching spring 42 that is formed of a spring plate material and urges the movable blade 40 and the fixed blade 41 in close contact, and the movable blade 41 can be slid only to the left and right. And a guide structure for guiding. The fixed blade 40 and the movable blade 41 include a blade body 44 and 57 in which cutting blades 47 and 59 are formed, and a fixed blade holder 23 and a movable blade holder 58 that support the blade bodies 44 and 57, respectively. The clamping spring 42 includes a base wall 70 that is fixed between the blade body 44 of the fixed blade 40 and the fixed blade holder 23, and a spring wall 71 that faces the base wall 70 with the blade body 44 and the movable blade 41 interposed therebetween. And a connecting arm 72 that connects both the walls 70 and 71 is provided integrally. Thus, an action portion 73 that presses the movable blade 41 over substantially the entire width of the cutting blade sliding surface 45 of the fixed blade 40 is formed on the free end side of the spring wall 71. The almost full width of the cutting blade sliding surface 45 means that the pressing range by the action portion 73 occupies most of the width direction of the cutting blade sliding surface 45, and the full width of the cutting blade sliding surface 45. Of course, the action part 73 includes a case where the action part 73 presses a majority or more of the full width of the cutting blade sliding surface 45. Moreover, as shown in FIG. 11, it is natural to include a case where the cutting edge sliding surface 45 is intermittently pressed by the action portion 73.

  Assembly holes 49 and 76 are formed in the base wall 70 of the clamping spring 42 and the blade body 44 of the fixed blade 40, respectively. The assembly hole 76 of the base wall 70 and the assembly hole 49 formed in the blade body 44 are mounted and positioned on the assembly pins 54 protruding from the fixed blade holder 23. Thus, the blade body 44 of the fixed blade 40 and the base wall 70 are fixed to the fixed blade holder 23 by caulking the protruding end of the assembly pin 54 with a caulking tool.

  Assembly holes 49 are formed in the vicinity of at least both sides of the cutting blade sliding surface 45 of the blade body 44 constituting the fixed blade 40. A machining hole 78 for inserting a caulking tool is formed in the spring wall 71 corresponding to the assembly pin 54.

  A plurality of positioning pins 55 are provided on the fixed blade holder 23 to position the base wall 70 of the holding spring 42 and the blade body 44 of the fixed blade 40 in cooperation with the assembly pin 54. The guide structure includes a slide groove 64 provided in the movable blade 41 and the positioning pin 55 that is fitted to the slide groove 64 and guides and supports the movable blade 41 so as to be slidable back and forth.

  The connecting arm 72 that connects the base wall 70 and the spring wall 71 is reversely bent in a dominant arc shape continuously to the base wall 70 while bypassing the drive-side sliding surface 46 and the movable blade 41 of the blade body 44. The spring wall 71 is formed in a stepped shape continuously with the curved end of the connecting arm 72.

  A pressing portion 75 that receives the spring wall 71 near the curved end of the connecting arm 72 is formed on the opposing wall 25 that is disposed to face the fixed blade holder 23. An escape portion 30 that receives the curved wall of the connecting arm 72 is formed in the opposing wall 25 adjacent to the pressing portion 75.

  Action portions 73 and slits 96 are alternately formed on the free end side of the spring wall 71.

  In the present invention, the shear blade unit is configured by the fixed blade 40 and the movable blade 41, the sandwiching spring 42 made of a spring plate material, the guide structure provided between the fixed blade 40 and the movable blade 41, and the like. Further, the clamping spring 42 is constituted by the base wall 70 and the spring wall 71 facing each other, and the connecting arm 72 connecting both the walls 70 and 71, and is movable by the action portion 73 provided on the free end side of the spring wall 71. The blade 41 can be pressed over substantially the entire width of the cutting blade sliding surface 45 of the fixed blade 40.

  Therefore, according to the shearing blade unit of the present invention, compared with the shearing blade structure having a presser spring formed of a conventional spring wire or spring plate material, the pressing force by the clamping spring 42 is not concentrated locally. Thus, the movable blade 41 can be pressed and urged uniformly against the fixed blade 40 over substantially the entire stroke range of the cutting blade sliding surface 45. As a result, the movable blade 41 can always be properly adhered to the fixed blade 40, and a good sharpness can be exhibited over a long period of time, and when the movable blade 41 reciprocates, the spring wall 71 and the action portion 73 are twisted. Therefore, the cutting action of the shearing blade unit can be smoothed.

  The assembly holes 49 and 76 provided in the base wall 71 of the clamping spring 42 and the blade body 44 of the fixed blade 40 are respectively mounted on the assembly pins 54 protruding from the fixed blade holder 23 and positioned. With the shearing blade unit for fixing the blade body 44 and the base wall 71 of the fixed blade 40 together with the fixed blade holder 23 by caulking the protruding end of the assembly pin 54 with a caulking tool, the blade body 44 is clamped. The three members of the spring 42 and the fixed blade holder 23 can be integrated in a properly positioned state. Further, since the clamping spring 42 and the blade body 44 can be assembled accurately with no variation in the assembly position and with no wobbling in all directions, the pressing force applied to the movable blade 41 by the clamping spring 42 can be reduced. The sharpness of the shearing blade unit can be improved by always keeping the pressure and the pressing position constant.

  When the assembly holes 49 are formed at least near both sides of the cutting blade sliding surface 45 of the blade body 44 constituting the fixed blade 40, the edge of the blade body 44 that is likely to be lifted off from the fixed blade holder 23 is surely located at both ends. The cutting blade sliding surface 45 that can be firmly fixed in the vicinity of the sliding surface 45 and thus receives the movable blade 41 is always kept flush, and the shearing action by the fixed blade 40 and the movable blade 41 is further optimized. Can improve sharpness. Further, if the machining hole 78 corresponding to the assembly pin 54 is formed in the spring wall 71, the caulking tool can be inserted through the machining hole 78 to ensure that the assembly pin 54 is always caulked. This can be done easily, and the labor and cost required for assembling the shear blade unit can be reduced accordingly.

  If a plurality of positioning pins 55 are provided on the fixed blade holder 23 in addition to the assembly pins 54 described above, the blade body 44 and the clamping spring 42 of the fixed blade 40 can be more accurately positioned without rattling. The assembly accuracy of the blade body 44 and the clamping spring 42 with respect to the movable blade 41 can be further improved. In addition, since the guide structure for the movable blade 41 is configured using the positioning pin 55, the structure of the shear blade unit can be simplified and the manufacturing cost can be reduced as much as there is no waste in the structure.

  According to the sandwiching spring 42 in which the connecting arm 72 is continuously bent to the base wall 70 in a reverse arc shape and the spring wall 71 is formed in a stepped shape continuously to the curved end of the connecting arm 72, the spring wall 71 is fixed. When the deformation operation is performed in a direction away from the blade 40, the spring wall 71 can be easily expanded by an amount corresponding to the longer bending length of the connecting arm 72. Therefore, the movable blade 41 is interposed between the fixed blade 40 and the spring wall 71. The work for assembling can be done easily. When the spring wall 71 is expanded, the connecting arm 72 can be well prevented from being deformed beyond the elastic limit.

  A pressing portion 75 that receives the spring wall 71 is formed on the facing wall 25 that is disposed to face the fixed blade holder 23, and a relief portion 30 that receives the curved wall of the connecting arm 72 adjacent to the pressing portion 75 is formed on the facing wall 25. When formed, the movable blade 41 can be appropriately and uniformly pressed against the cutting blade sliding surface 45 by the elastic force of only the spring wall 71. That is, as compared with the case where the movable blade 41 is pressed against the cutting blade sliding surface 45 by the elastic force of the connecting arm 72, the arm length of the spring exhibiting elasticity is reduced, and the influence of the variation in the curved shape of the connecting arm 72 is affected. Therefore, the movable blade 41 can be firmly pressed against the cutting blade sliding surface 45 in a state where a constant elastic force is always exerted. There is also an advantage that the total thickness dimension of the shearing blade unit can be reduced and made compact by the amount that the curved wall of the connecting arm 72 enters the escape portion 30.

  According to the sandwiching spring 42 in which the action portions 73 and the slits 96 are alternately formed on the free end side of the spring wall 71, the action portion 73 is intermittently divided, so that one action portion 71 and the cutting blade slide. When the heel is caught between the surface 45 and the other working part 71 is prevented from being lifted away from the cutting blade sliding surface 45, the movable blade 41 is evenly arranged with respect to the cutting blade sliding surface 45. Can be pressed.

(Example) FIGS. 1-10 shows the Example which applied the shearing blade unit based on this invention to the electric shaver. 2 to 4, the electric razor includes a main body case 1, an operation unit 2 assembled to the main body case 1, a trimmer unit 3 disposed on the back surface of the main body case 1, and an attachment 4 that adjusts the trimming height. Constitute. The main body case 1 is configured by joining a front case 1a and a rear case 1b, which are divided into two parts in the front and the rear, and a lower case 1c and the like which are externally fitted to the front and rear cases 1a and 1b. At the top and bottom of the front case 1a, there are provided a switch knob 5 for starting the motor and an indicator lamp 6 for displaying the operating state of the electric razor.

  As shown in FIG. 4, the operation unit 2 includes an electrical component unit occupying the lower half, a razor head 9 provided on the upper part, a motor 10, and the like. The electrical component unit is configured by assembling the circuit board, the secondary battery 11 and the like to the electrical component holder. On the circuit board, switches that are switched by the previous switch knob 5, electronic components that constitute the control circuit, LEDs that serve as the light source of the indicator lamp 6, and the like are mounted. The electrical component unit is accommodated in the main body case 1, and in this assembled state, the razor head 9 including the motor 10 is supported so as to be able to float in all directions of front and rear, left and right, and up and down.

  As shown in FIGS. 3 and 10, the razor head 9 includes a pair of front and rear main blades 12, a center blade 13 disposed between the pair of main blades 12, a motor 10 and a driving mechanism that reciprocally drive them. Etc. are incorporated. The rotational power of the motor 10 is converted into reciprocating power by an eccentric cam 15 fixed to the output shaft and a vibrator 17 incorporated in the head case 16, and a pair of front and rear drive shafts 18. 18 is transmitted to the main blade 12 via 18.

  A drive piece 19a for simultaneously driving the center blade 13 is fixed to the drive shaft 18 located at the front of the case, and a trimming blade 24 of the trimmer unit 3 described later is attached to the drive shaft 18 located at the rear of the case. A driving piece 19b to be driven is fixed. The drive shaft 18 and the head case 16 are sealed with packing. Reference numeral 20 denotes a motor holder fixed to the lower surface of the head case 16, and the previous vibrator 17 is incorporated in a vibrator housing portion formed on the upper part of the motor holder 20.

  5 and 6, the trimmer unit 3 includes a holder 23 supported so as to be vertically slidable along a flat surface 7 provided on the rear surface of the rear case 1b, a trimming blade 24 disposed above the holder 23, An inner cover (opposing wall) 25 that is engaged and mounted on the inner surface of the holder 23 and covers the trimming blade 24 is formed. The trimming blade 24 is composed of a shear blade unit according to the present invention.

  The holder 23 also serves as a fixed blade holder that constitutes the fixed blade 40 described later, and is made of a plastic plate-shaped plastic product having a face facing the rear case 1b and an upper surface opened. A trimming blade 24 is arranged on the inner surface of the upper portion of the holder 23 formed in a wide width, and a transmission lever 27 for transmitting driving power to the trimming blade 24 is incorporated below the trimming blade 24. A finger holder 26 for sliding the trimmer unit 3 up and down is formed in the lower part of the outer surface of the holder 23 (see FIG. 3). The holder 23 and the inner cover 25 are integrated by engaging a pair of left and right engaging pieces 28 provided at the upper part of the inner surface of the holder 23 with the opening 29 of the inner cover 25. The inner cover 25 is formed with a pair of left and right relief portions 30 separately from the previous opening 29, the function of which will be described later.

  A pair of slide legs 31 are formed at the upper and lower center of the inner surface of the holder, and these slide legs 31 are engaged with a pair of left and right guide walls 32 (see FIG. 5) provided on the flat wall 7 of the rear case 1b from the inside. By combining, the holder 23 and the inner cover 25 are supported by the main body case 1 so as to be slidable between the lower standby position and the upper operation position. In this assembled state, as shown in FIG. 7, the longitudinal rib 33 provided at the lower inner surface of the holder 23 is engaged and guided by the guide groove 34 provided in the rear case 1b to restrict the meandering of the holder 23. Transmission loss when power is transmitted from the piece 19b to the trimming blade 24 via the transmission lever 27 can be eliminated.

  A moderation mechanism is provided between the inner cover 25 and the rear case 1b to hold the trimmer unit 3 in the standby position and the operating position. As shown in FIG. 6 and FIG. 7, the moderation mechanism includes a U-shaped elastic arm 36 that continues from the lower plate surface of the inner cover 25 and a pin-shaped moderation formed on a midway facing surface of the elastic arm 36. The projection 37 and a pair of left and right moderation ribs 38 provided on the flat wall 7 of the rear case 1b.

  When the trimmer unit 3 is in the standby position, the moderation protrusion 37 rides on the lower end of the moderation rib 38. As shown in FIG. 7, when the trimmer unit 3 is pushed up to the operating position, the moderation protrusion 37 slides along the outer surface of the moderation rib 38 while elastically deforming the elastic arm 36 in an outward bulge shape. At the upper end, the moderation protrusion 37 rides on the upper end of the moderation rib 38 and holds the operating position.

  In FIG. 8, the trimming blade 24 includes a fixed blade 40 and a movable blade 41 disposed on the inner surface of the holder 23, and a clamping spring 42 that tightly clamps the fixed blade 40 and the movable blade 41. The fixed blade 40 includes a press-molded blade body 44 and a holder (fixed blade holder) 23 that fixes and supports the blade body 44. On the upper and lower sides of the blade main body 44, a ground cutting edge sliding surface 45 and a driving side sliding surface 46 are provided, and a group of cutting edges 47 are sawed along the upper edge of the cutting edge sliding surface 45. It is formed in a blade shape. The entire blade body 44 is formed in an inverted trapezoidal shape that swells from the cutting blade sliding surface 45 side toward the driving side sliding surface 46 side.

  A fastening seat 48 that protrudes toward the holder 23 is formed between the cutting blade sliding surface 45 and the driving side sliding surface 46 so as to be bent over the entire lateral width of the blade body 44. The fastening seat 48 is formed with a pair of left and right assembly holes 49 and positioning holes 50. The assembly hole 49 is formed in the vicinity of the bent portion adjacent to the cutting blade sliding surface 45 and closer to the left and right ends of the seat wall. The positioning hole 50 is formed in the vicinity of a bent portion adjacent to the driving side sliding surface 46.

  The holder 23 is made of a plastic molded product. In order to position and fix the blade main body 44, a pair of left and right assembly pins 54 that engage with the assembly holes 49 and a left and right assembly that engages with the positioning holes 50 are provided. A pair of positioning pins 55 project integrally with each other. The positioning pin 55 also serves as a guide pin having a guide structure. As will be described later, the blade body 44 is welded and fixed to the holder 23 together with the holding spring 42.

  The movable blade 41 includes a flat blade body 57 formed by an etching process and a movable blade holder 58 for fixing the blade body 57. A group of cutting blades 59 are formed in a saw blade shape in the blade body 44, and three welding holes 60 and a pair of left and right mounting holes 61 are formed in the face wall. The movable blade holder 58 is made of a plastic molded product, and three welding pins 62 corresponding to the welding holes 60 and a slide groove 64 provided between the pair of ribs 63 are formed on the plate surface.

  On the drive edge side of the movable blade holder 58, a passive piece 65 is formed to bulge, and a passive hole 66 that inherits the swinging power of the transmission lever 27 is formed at the center thereof. By joining the blade body 57 to the movable blade holder 58 in a state where the welding pin 62 and the welding hole 60 and the rib 63 and the mounting hole 61 are engaged with each other, the tip of the welding pin 62 is melted and caulked. The blade body 57 and the movable blade holder 58 can be integrated.

  In FIG. 8, the clamping spring 42 is formed using a metal spring plate material such as a stainless plate material, for example, a horizontally long base wall 70, a portal spring wall 71 facing the base wall 70, A connecting arm 72 that connects both the walls 70 and 71 is integrally provided. On the free end side of the spring wall 71, an action portion 73 that presses the movable blade 41 over almost the entire width of the cutting blade sliding surface 45 and a protective rib 74 are formed. As shown in FIG. 9, the left-right width of the spring wall 71 is set larger than the left-right width of the movable blade 41 so that the movable blade 41 can be pressed in almost the entire range of the slide stroke.

  An assembly hole 76 and a pin hole 77 corresponding to the assembly pin 54 and the positioning pin 55 are formed in the base wall 70 of the clamping spring 42, and a welding horn (caulking tool) is inserted into the spring wall 71. A machining hole 78 is formed corresponding to the previous assembly hole 76. The connecting arm 72 is continuously bent and bent in a dominant arc shape at both ends of the drive edge of the base wall 70, and a spring wall 71 is formed in a stepped shape continuously at the curved end. Most of the face wall of the spring wall 71 is continuously cut out largely from the opposing edges of the left and right connecting arms 72, and processed holes 78 are formed on the left and right sides of the cut-out portion.

  The trimming blade 24 is assembled as follows. As shown in FIG. 6, the base wall 70 and the blade body 44 of the fixed blade 40 are joined to the holder 23 in the order described, and the assembly pins 54 and the positioning pins 55 provided on the holder 23 are attached to the assembly holes of the base wall 70. 76, the pin hole 77, and the assembly hole 49 of the blade body 44 and the positioning hole 50 are engaged. Next, a welding horn is inserted from the processing hole 78 of the spring wall 71, and the protruding end of the assembly pin 54 is melted and caulked, whereby the holding spring 42 and the blade body 44 of the fixed blade 40 are integrated with the holder 23. Can be

  In this manner, in a state where the clamping spring 42 and the blade body 44 are fastened and fixed together to the holder 23, the clamping spring 42 and the blade body 44 are positioned by a total of four pins, the assembly pin 54 and the positioning pin 55. Therefore, the clamping spring 42 and the blade main body 44 can be accurately assembled in a state where there is no positional deviation or variation and there is no backlash in all directions. This means that the relationship between the holding spring 42 and the movable blade 41 can be kept constant, and the pressing force and the pressing position applied to the movable blade 41 by the holding spring 42 can always be made constant.

  Thereafter, while elastically deforming the connecting arm 72, the spring wall 71 is lifted away from the fixed blade 40 to secure a sufficient clearance between the spring wall 71 and the fixed blade 40, and the movable blade 41 is secured from this clearance. Then, the slide groove 64 is dropped onto the positioning pin 55 and engaged. Finally, the trimming blade 24 can be assembled by engaging and mounting the inner cover 25 to the holder 23. In this assembled state, the action portion 73 of the spring wall 71 presses the movable blade holder 58 near the cutting blade 59 of the movable blade 41. Moreover, the action portion 73 presses the movable blade 41 evenly over substantially the entire width of the cutting blade sliding surface as shown in FIG.

  Thus, according to the trimming blade 24 that presses and urges the movable blade 41 against the fixed blade 40 uniformly over substantially the entire stroke range of the cutting blade sliding surface 45, the movable blade 41 is always appropriate to the fixed blade 40. Therefore, the trimming blade 24 can exhibit a good sharpness over a long period of time, and can improve the cutting efficiency of the scissors.

  In the above assembled state, as shown in FIG. 1, the connecting arm 72 bypasses the drive side sliding surface 46 of the fixed blade 40 and the movable blade 41, and a part of the arc wall enters the escape portion 30, A base end portion 71 a on the connecting arm 72 side of the spring wall 71 is received by a pressing portion 75 at the periphery of the escape portion 30. When the base end portion 71a of the spring wall 71 is received by the pressing portion 75 in this way, the movable blade 41 can be appropriately pressed against the cutting blade sliding surface 45 by the elastic force of only the spring wall 71, and thus is inverted and bent. Compared with the case where the movable blade 41 is pressed against the cutting blade sliding surface 45 by the elastic force of the connecting arm 72, the arm length of the spring exhibiting elasticity can be reduced. In addition, since the influence of the variation in the curved shape of the connecting arm 72 can be eliminated, the movable blade 41 can be pressed firmly against the cutting blade sliding surface 45 while always exhibiting a certain elastic force.

  As shown in FIG. 1 and FIG. 9, the transmission lever 27 is supported by a shaft 90 provided on the inner surface of the holder 23 at the upper and lower middle portions, and can swing left and right. A drive pin 92 is provided at the upper end of the drive. In a state where the trimming blade 24 and the transmission lever 27 are assembled to the holder 23, the drive pin 92 is engaged with the passive hole 66 of the movable blade holder 58. As shown in FIG. 10, when the holder 23 is pushed up to the operating position, the passive pin 91 engages with the engagement groove 93 provided in the drive piece 19b, so that the reciprocating operation of the vibrator 17 is performed with the drive piece 19b and the transmission lever. 27 can be transmitted to the movable blade 41 of the trimming blade 24 via 27.

  The attachment 4 includes a main body portion 80 attached to the holder 23, a group of toothed teeth 81 bulging and inclined obliquely upward, and a pair of left and right continuous with the toothed teeth 81 on both side ends. It is formed in a cap shape with a sidewall or the like. Between the adjacent toothed teeth 81, comb grooves for introducing and guiding the eyelids are formed. The main body 80 is guided and supported by the holder 23 so as to be slidable up and down, and can be locked and held at regular intervals by a lock structure provided therebetween.

  As shown in FIG. 10, the lock structure has a lock lever 83 assembled to the inner surface of the main body 80, a torsion coil spring 84 that locks and biases the lock lever 83, and locks the lock lever 83 against the spring 84. A lock release button 85 for performing a release operation, an engagement recess 86 provided on the holder 23 side corresponding to the lock lever 83, and the like are included.

  By pushing the lock release button 85 to slide the main body 80 and changing the engagement position of the lock lever 83 and the engagement recess 86, the distance between the toothed hook 81 and the trimming blade 24 is changed, The trimming height by the trimming blade 24 can be adjusted. If the lock claw of the lock lever 83 is positioned above the uppermost engaging recess 86, the attachment 3 can be removed from the holder 23 upward. The edge can be shaved.

  When trimming the heel, the attachment 4 is inserted and attached to the holder 23 from above, the lock release button 85 is pushed in, and the attachment 4 is adjusted and moved until a predetermined trimming height is reached. In this state, when the trimmer unit 3 is pushed up to the operating position and the switch knob 5 is turned on, the trimming blade 24 can be driven to trim the ridge.

  FIG. 11 shows another embodiment of the holding spring 42. In this case, the protective rib 74 and the spring wall 71 adjacent to the protective rib 74 are divided by six slits 96 to intermittently form the action portion 73. Thus, according to the clamping spring 42 in which the action part 73 is formed intermittently, the reciprocating speed of the movable blade 41 is sufficient although the surface pressure at the cutting blade sliding surface 45 facing the slit 96 is reduced. Therefore, the blade body 57 can be properly adhered to the fixed blade 40. Since others are the same as the previous embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted. The same applies to the following embodiments.

  FIG. 12 shows an embodiment in which the shear blade unit is applied to an electric clipper. In this case, the blade main body 44 is fixed to the fixed blade holder 23 which is attached to and detached from the main body case, and the fixed blade 40 is obtained. A passive piece 99 that inherits the reciprocating power is provided obliquely upward at the rear end of the upper surface of the movable blade holder 58. Further, a pressing protrusion (pressing portion) 75 is provided on the inner surface of the collar wall (opposing wall) 97 of the main body case, and the base end portion 71a of the spring wall 71 is received by the protrusion 98 when the fixed blade 40 is mounted on the main body case. I was able to.

  In addition to the above embodiment, the fixed blade holder 23, the base wall 71 of the holding spring 42, and the blade body 44 of the fixed blade 40 are integrated by caulking an assembly pin 54 separate from the fixed blade holder 23. be able to. The connecting arm 72 does not need to be formed in a cross-sectional arc shape, and can be formed in a semicircular cross-section or a U-shape. The guide structure of the movable blade 41 does not need to be configured by the positioning pin 55 and the slide groove 64, and can be configured by using a rib and a slide groove, a guide shaft and a slide piece, or the like as elements. The escape portion 30 that receives the arc wall of the connecting arm 72 does not need to be a through hole, and can be formed as a recess. In the above embodiment, the base end portion 71a of the spring wall 71 is received by the pressing portion 75. However, if necessary, the action portion 73 can be pressed against the movable blade 41 by the elasticity of the pair of left and right connecting arms 72. it can.

It is a vertical side view of a trimming blade. It is a front view of an electric razor. It is a side view of an electric razor. It is an exploded side view of an electric razor. It is a disassembled perspective view which shows the case structure of a trimming blade. It is the disassembled perspective view which looked at the trimming blade from the inner surface side. It is the sectional view on the AA line in FIG. It is a disassembled perspective view of a trimming blade. It is the front view which looked at the trimming blade from the inner surface side. It is a vertical side view which shows the use aspect of a trimming blade and an attachment. It is a front view which shows another Example of a trimming blade. It is a vertical side view which shows another example of application of a shear blade unit.

Explanation of symbols

23 Holder 40 Fixed blade 41 Movable blade 42 Nipping spring 44 Blade body 45 Cutting blade sliding surface 49 Assembly hole 54 Assembly pin 57 Blade body 58 Movable blade holder 70 Base wall 71 Spring wall 72 Connecting arm 73 Working part

Claims (7)

A fixed blade (40), a movable blade (41), a sandwiching spring (42) formed of a spring plate material to urge the movable blade (40) and the fixed blade (41) in close contact with each other, and a movable blade (41) It has a guide structure that guides only the left and right slides freely,
The fixed blade (40) and the movable blade (41) include a blade body (44) and (57) on which cutting blades (47) and (59) are formed, respectively, and each blade body (44) and (57). Comprising a supporting fixed blade holder (23) and a movable blade holder (58),
The clamping spring (42) includes a base wall (70) fixed between the blade body (44) of the fixed blade (40) and the fixed blade holder (23), the blade body (44), and the movable blade (41). A spring wall (71) facing the base wall (70) with a sandwiched between and a connecting arm (72) connecting these walls (70), (71).
An action portion (73) for pressing the movable blade (41) over substantially the entire width of the cutting blade sliding surface (45) of the fixed blade (40) is formed on the free end side of the spring wall (71). Shear blade unit. Assembly holes (49) and (76) are respectively formed in the base wall (70) of the clamping spring (42) and the blade body (44) of the fixed blade (40),
An assembly hole (76) in the base wall (70) and an assembly hole (49) formed in the blade body (44) are attached to an assembly pin (54) protruding from the fixed blade holder (23). Are positioned,
The blade body (44) and the base wall (70) of the fixed blade (40) are fixed to the fixed blade holder (23) by caulking the protruding end of the assembly pin (54) with a caulking tool. The described shearing blade unit. Assembly holes (49) are formed at least near both sides of the cutting blade sliding surface (45) of the blade body (44) constituting the fixed blade (40),
3. The shearing blade unit according to claim 2, wherein a machining hole (78) for inserting the caulking tool is formed in the spring wall (71) corresponding to the assembly pin (54). A plurality of positioning pins (55) for positioning the base wall (70) of the clamping spring (42) and the blade body (44) of the fixed blade (40) in cooperation with the assembly pin (54) are fixed blade holders. (23)
The guide structure includes a slide groove (64) provided in the movable blade (41) and the positioning pin (55) which is fitted to the slide groove (64) and guides and supports the movable blade (41) so as to be slidable back and forth. The shear blade unit according to any one of claims 1 to 3, wherein the shear blade unit is configured. In a state where the connecting arm (72) connecting the base wall (70) and the spring wall (71) bypasses the drive side sliding surface (46) and the movable blade (41) of the blade body (47), 70) is continuously inverted and bent in a dominant arc shape,
The shearing blade unit according to claim 4, wherein the spring wall (71) is formed in a stepped shape continuously with the curved end of the connecting arm (72). A pressing portion (75) for receiving the spring wall (71) near the curved end of the connecting arm (72) is formed on the opposing wall (25) arranged to face the fixed blade holder (23),
The shearing blade unit according to claim 5, wherein a relief portion (30) for receiving the curved wall of the connecting arm (72) is formed on the opposing wall (25) adjacent to the pressing portion (75).   The shearing blade unit according to claim 5 or 6, wherein the action portion (73) and the slit (96) are alternately formed on the free end side of the spring wall (71).

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