JP2007215595A - Electric razor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric razor capable of catching and fixing beard which enters a blade hole earlier than catching by a cutter and a shaving foil, thereby effectively cutting the beard and also performing deep shaving. <P>SOLUTION: The electric razor has the shaving foil 17 and the cutter 19 in a slit blade structure formed by an etching method. On the cutter 19, an inversely U-shaped cutting blade 32 for cutting the beard in cooperation with the shaving foil 17 and a slit-like blade hole 33 are alternately formed. A cutting edge 34 is formed on the side of the sliding surface of the cutting blade 32, and a catching blade 35 for catching the beard is formed on the side of a non-sliding surface. The catching blade 35 is formed by setting a cutting blade width B1 on the side of the non-sliding surface in the cutting blade 32 larger than a cutting blade width B2 on the side of the sliding surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric razor including an inner blade having a slit blade structure.

  One of the cutting blade structures of an inner blade in an electric razor is a slit blade structure. This type of inner blade can be formed by an etching method as disclosed in Patent Document 1, for example. A sharp blade edge is formed on the cutting blade formed by the etching method by the cutting blade sliding surface and the concave curved surface formed by the etching action of the etching solution (see Patent Document 2). Therefore, this type of inner blade can improve the sharpness of the inner blade as compared with an inner blade formed by a precision press method. In the etching method, since both side surfaces of the cutting blade are etched into a concave curved surface, the cutting blade width on the sliding surface with the fixed blade is different from the cutting blade width on the release surface side. In an inner blade having a conventional slit blade structure, the cutting blade is configured such that the cutting blade width on the sliding surface side is larger than the cutting blade width on the release surface side.

  The inner blade according to the present invention improves the beard capturing effect by using the side edge of the cutting blade formed by the etching method, but it is possible to improve the whisker capturing effect by using a part of the cutting blade. Patent Document 2 discloses this. There, an etching process is performed from both the front and back sides of the plate-shaped blade blank, and an edge portion is formed at an intermediate position in the thickness direction of the cutting blade, so that the beard can be captured more reliably by the cooperative action of the edge portion and the blade edge. I have to.

Japanese Patent Laying-Open No. 2005-52556 (paragraph number 0034, FIG. 6) JP 2003-966 A (paragraph number 0035, FIG. 1) (paragraph number 0040, FIG. 13)

  The beard on the skin grows in various lengths in various directions. Moreover, when the skin surface is pulled or pressed, the directions of the hair roots and the whiskers change greatly. For this reason, when using an electric razor, even if the beard enters into the blade holes of the outer blade and the inner blade, the whisker moves until it is cut by the inner blade and cannot be cut at the base end (near the root). Or a beard protrudes from a blade hole and a beard cutting may not be performed effectively.

  In many cases, the width dimension of the blade hole formed in the outer cutter and the inner cutter is set sufficiently larger than the diameter dimension of the whiskers. Therefore, there is room for the whisk that has entered the blade hole to move in the blade hole until the cutting edge of the inner blade comes into contact with the blade and is received by the cutting edge of the outer blade. Moreover, the outer blade continues to move along the skin surface. For this reason, even if the beard enters the blade hole, it may come out of the blade hole before being cut by the inner blade, which is one reason why the beard cutting cannot be performed effectively.

  In this regard, as in Patent Document 2, when the beard is captured in cooperation with the cutting edge of the cutting edge and the edge portion provided at the intermediate position in the thickness direction, and the beard is cut in this state, the beard that has entered the blade hole It is possible to deter the escape to some extent. However, even though the edge is provided, the whisker is still captured and fixed until the peripheral surface of the whistle contacts the cutting edge of the inner cutting edge and is received by the cutting edge of the outer cutting edge. It is still not sufficient for effective beard cutting.

  It is an object of the present invention to be able to capture the whisker that has entered the blade hole before it is captured by the cutting blade of the inner blade and the cutting blade of the outer blade, and therefore, an electric shaver that can effectively perform whisker cutting. Is to provide. It is an object of the present invention to capture a whisker that has entered a blade hole in advance and to fix it while being dragged into the blade hole, so that the whisker can be cut closer to its proximal end, so that an electric shaver with excellent shave effect can be obtained. Is to provide.

  The electric razor of the present invention has a laterally long outer blade 17 that is retained in an inverted U shape, and an inner blade 19 having a slit blade structure. The inner blade 19 is driven to reciprocate along the sliding surface 18 of the outer blade 17. In the inner blade 19, inverted U-shaped cutting blades 32 that cut the whisker in cooperation with the outer blade 17 and slit-shaped blade holes 33 are alternately formed. The cutting blade width B1 on the non-sliding surface side of the cutting blade 32 is set to be larger than the cutting blade width B2 on the sliding surface side, and the whiskers are placed on both sides of the cutting blade 32 on the non-sliding surface side. A capturing blade 35 for capturing in advance is formed.

  When the projecting dimension from the cutting edge 34 provided on the sliding surface side of the cutting edge 32 to the catching blade 35 provided on the non-sliding surface side of the cutting edge 32 is T, an inequality (0 <T <70 μm) Is set so that the front cutting edge widths B1 and B2 are satisfied.

  A friction-increasing body 44 for increasing the frictional resistance with the whiskers is provided along the leading edge of the catching blade 35.

  The thickness H of the cutting edge is set so as to satisfy the inequality (0.15 mm <H <0.4 mm).

  In the electric razor provided with the inner blade 19 having the slit blade structure of the present invention, the cutting blade 32 and the slit-shaped blade hole 33 are alternately formed on the inner blade 19, and the non-sliding surface side of the cutting blade 32 is formed. By setting the cutting edge width B1 to be larger than the cutting edge width B2 on the sliding surface side, the catching blades 35 were formed on both sides of the cutting blade 32 on the non-sliding surface side. When the catching blade 35 is provided on the non-sliding surface side in this manner, the whiskers that have entered the blade holes 17b and 33 of the outer blade 17 and the inner blade 19 during the shaving are caught by the catching blade 35 before the cutting edge 34. In addition, since the whisker can be pinched and fixed in cooperation with the cutting blade 17a of the outer blade 17, the whisker cannot move inside the blade holes 17b and 33 and cannot escape from the blade holes 17b and 33. Therefore, according to the electric shaver of the present invention, the whiskers that have entered the blade holes 17b and 33 can be effectively cut without any excess.

  In a state where the beard is sandwiched and fixed between the cutting edge 17a of the outer blade 17 and the capture blade 35, the capture blade 35 bites into the surface of the beard, so that the entire whisker can be dragged toward the blade holes 17b and 33. By cutting the beard in this state, the beard can be cut closer to the base end. In addition, since the beard after cutting is released from the pulling force of the capturing blade 35 and retreats to the hair root side, the cut surface sinks from the skin surface, and therefore more reliably than a conventional electric shaver of this type. I can shave.

  When the projecting dimension from the blade edge 34 to the capture blade 35 is T, if the inequality (0 <T <70 μm) is satisfied, the inner blade 19 suitable for practical use can be obtained. The reason is that the diameter of the whiskers is generally set to 70 to 140 μm. Therefore, when the protruding dimension T is larger than 70 μm, the trapping blade having a cutting action before the cutting edge 34 of the inner blade 19 contacts the whiskers. This is because 35 cuts the beard. Further, in order to capture the whiskers with the capturing blade 35 before the cutting edge 34 of the inner blade 19, the protruding dimension T needs to be larger than zero.

  If the friction increasing body 44 is provided along the front edge of the trapping blade 35, it is possible to restrict the whisker from slipping by the friction increasing body 44 when the trapping blade 35 comes into contact with the whiskers. The whiskers can be more effectively captured and fixed to cut the whiskers more effectively.

  The thickness dimension H of the cutting edge 32 is set to (0.15 mm <H <0.4 mm) in consideration of the average value of the daily growth amount of the whiskers being about 0.4 mm. Theoretically, the smaller the thickness dimension of the cutting blade 32, the more reliably the beard can be captured by the capturing blade 35. However, as the thickness dimension of the cutting blade 32 is thinner, the strength of the inner blade 19 is lowered, and processing becomes difficult. Therefore, the lower limit value of the thickness dimension H of the cutting edge 32 is set to a value exceeding 0.15 mm so as to ensure workability and durability. Since the average value of the daily growth amount of the whiskers is about 0.4 mm, it becomes difficult to capture the whiskers with the capturing blade 35 when the thickness dimension of the cutting blade 32 is 0.4 mm or more.

(Embodiment) FIGS. 1 to 9 show an embodiment of an electric shaver according to the present invention. 1 and 2, the electric razor includes a main body case 1, an operation unit inserted into and loaded in the main body case 1, a switch panel 2 mounted on the front surface of the main body case 1, and a sharp shaving blade disposed on the rear surface of the case. It consists of units (not shown). At the top and bottom of the switch panel 2, a switch button 3 for starting the motor, an indicator lamp 5 for displaying the operating state of the electric razor, and the like are provided.

  The operation unit includes a lower half electrical component unit and a razor head provided on the upper part. The electrical component unit is configured by assembling a circuit board, a secondary battery 7, a motor 8 and the like to an electrical component holder. On the circuit board, electronic parts constituting the control circuit, switches that are switched by the previous switch button 3, LEDs for indicator lights, and the like are mounted. These electrical components are housed in the main body case 1 together with the electrical component holder and sealed in a watertight manner.

  As shown in FIGS. 2, 4 and 5, the razor head is provided with a pair of front and rear main blades 10, a center blade 11 disposed between the pair of main blades 10, a driving mechanism for driving them, and the like. It is. The motor power is converted into reciprocating power by the eccentric cam 12 and the vibrator 13 fixed to the output shaft, and is transmitted to the main blade 10 and the center blade 11 via the drive shafts 14 and 15 provided on the top of the vibrator 13. Be transmitted.

  The main blade 10 includes an outer blade 17 and an inner blade 19 that is driven to reciprocate along a sliding surface 18 of the laterally long outer blade 17. The outer blade 17 is supported by an outer blade holder 21 that is detachably attached to the head case 20, and the inner blade 19 is held in an inverted U shape by the inner blade holder 22.

  In FIG. 5, the outer blade holder 21 is divided into an inner case 21b that supports the pair of front and rear outer blades 17 and the center blade 11, and an outer case 21a that supports the inner case 21b. As shown in FIG. 3, on the left and right inner surfaces of the main body case 1, there are a lock release button 27 that engages and captures the outer blade holder 21, and a compression coil spring 28 that presses and urges the lock release button 27 to the engagement posture. (See FIG. 3). When the left and right lock release buttons 27 are pushed in at the same time, the outer blade holder 21 can be removed from the razor head.

  As described above, when the outer blade holder 21 is composed of the outer case 21a and the inner case 21b, the inner case 21b, the outer blades 17 before and after the inner case 21b, and the center blade 11 are combined into one. It can be exchanged as a unit part, and the three of the front and rear outer blades 17 and the center blade 11 can be individually exchanged as necessary.

  The outer blade 17 is formed as a sheet-like mesh blade formed by an etching method or an electroforming method, and the front and rear edges are attached to the outer blade frame 29 as shown in FIG. Shape is retained. The outer blade frame 29 is detachably engaged with the inner case 21 b of the outer blade holder 21.

  The inner blade 19 is formed by etching a stainless steel plate having a thickness of 0.25 mm to form a sheet-shaped inner blade blank 50 as shown in FIG. 8, and then, as shown in FIG. The fixed mold 51 and the movable mold 52 are bent into a trapezoidal shape, and further, the second stage fixed mold 53 and the movable mold 54 are bent as shown in FIG. The cross section is formed in an inverted U shape. In the obtained inner blade 19, inverted U-shaped cutting blades 32 and slit-shaped blade holes 33 are alternately formed, and acute angles are formed on both sides of the sliding surface of the cutting blade 32 as shown in FIG. A cutting edge 34 is formed. Further, an acute angle capture blade 35 is formed on both sides of the curved inner surface of the cutting blade 32, that is, the non-sliding surface.

  In the etching method, a resist film is formed on the front and back of the sheet surface of the inner blade blank 50, and then the sheet surface surrounded by the resist pattern is etched with an etching solution, thereby forming a penetrating blade hole 33 in the inner blade blank 50. The formed and remaining wall portion is defined as a cutting blade 32. In the middle of etching, a concave-curved etched surface grown from the front side and a concave-curved etched surface grown from the back side are formed in the middle of the sheet in the thickness direction, and an edge portion is formed at the boundary between both etched surfaces. Is done. When further etching is performed from this state, the edge portion disappears, and both etched surfaces are smoothly continuous like one curved surface. As a result, the cutting blade 32 is formed in a drum shape as shown in FIG. 1, and a flared concave curved surface is formed on both side surfaces thereof. Therefore, the inner blade 19 having the cross-sectional shape shown in FIG. 1 can be formed by curving the inner blade blank 50 so that the side of the sheet surface having a smaller cutting edge width becomes the outer surface. Near the four corners of the inner blade blank 50, there are formed oblong engagement holes 36 that engage with catch claws 41 described later.

  According to the inner blade 19 configured as described above, the cutting blade width B1 on the non-sliding surface side is set larger than the cutting blade width B2 on the sliding surface side as shown in FIG. Capture blades 35 that capture the whiskers can be formed on both sides of the moving surface side cutting blade 32. In this example, the former cutting edge width B1 was 350 μm, and the latter cutting edge width B2 was 250 μm. Thereby, the protrusion dimension T from the blade edge 34 to the capture blade 35 is 50 μm. In this embodiment, the angle θ1 of the cutting edge 34 is 60 degrees, and the angle θ2 of the trapping blade 35 is 50 degrees.

  The inner blade 19 is attached and fixed to the inner blade holder 22 shown in FIG. The inner blade holder 22 includes a blade mounting base 37 whose upper and lower surfaces are open, a pair of side walls 38 projecting from the upper surfaces of the left and right sides of the blade mounting base 37, and a passive piece 39 provided on the lower surface side of the blade mounting base 37. It is a plastic molded product that is integrally provided with. A blade receiving surface 40 for receiving the inner blade 19 is formed on the front and rear surfaces of the blade mounting base 37 so as to be recessed.

  On the left and right sides of the blade receiving surface 40, elastically deformable catch claws 41 for engaging and fixing the inner blade 19 are integrally formed. In order to facilitate the mounting of the inner blade 19, the front and rear blade receiving surfaces 40 are formed in a downward tapered shape (see FIG. 4). The inner blade holder 22 has its passive piece 39 supported by the previous drive shaft 14 so as to be able to tilt left and right, and is urged upward by a spring 23 disposed between them. Therefore, the inner blade 19 can be driven to reciprocate in a state where it is always in close contact with the sliding surface 18 of the outer blade 17.

  According to the inner blade 19 configured as described above, the cutting blade width B1 on the non-sliding surface side is set larger than the cutting blade width B2 on the sliding surface side, so that the cutting blade on the non-sliding surface side is set. Capture blades 35 that capture the whiskers can be formed on both sides of 32. In this example, the former cutting edge width B1 was 350 μm, and the latter cutting edge width B2 was 250 μm. Thereby, the protrusion dimension T from the blade edge 34 to the capture blade 35 is 50 μm. In this embodiment, the angle θ1 of the cutting edge 34 is 60 degrees, and the angle θ2 of the trapping blade 35 is 50 degrees.

  As described above, when the catching blades 35 are formed on both sides of the cutting blade 32, as shown in FIG. 9A, the whiskers that have entered the blade hole 17b of the outer blade 17 and the blade hole 33 of the inner blade 19 are formed. Before the cutting edge 34 comes into contact with the blade 34, the catching blade 35 comes into contact with the whiskers and can be caught. Then, as shown in FIG. 9 (b), when the surface of the whiskers is received by the blade edge 17a of the outer blade 17, the whiskers are firmly held and fixed by the capture blade 35 and the blade edge 17a. It is impossible to escape from the holes 17b and 33. In this state, the capture blade 35 bites into the surface of the whiskers, so that the whiskers are dragged toward the blade holes 17b and 33. In this state, as shown in FIG. 9C, by cutting the beard with the cutting edge 34 of the inner blade 19 and the cutting edge 17a of the outer blade 17, the whiskers can be cut closer to the base end. As shown in FIG. 9 (d), the cut beard retreats to the hair root side, so that the cut surface sinks from the skin surface, so that it can be surely shaved.

  The diameter of a general human beard is 70 to 140 μm. Therefore, as shown in FIG. 9, when the whiskers enter the blade holes 17b and 33 of the outer blade 17 and the inner blade 19, if the tip protrusion dimension T is larger than 70 μm, the whisker is at the blade tip 17a of the outer blade 17. In the received state, the trapping blade 35 may bite into the beard excessively, and the whisker may be cut before the cutting edge 34 of the inner blade 19 comes into contact with the beard, so that deep shaving cannot be performed. In order to avoid such a situation, the protrusion dimension T must be less than 70 μm. Furthermore, since it is meaningless that the whisker cannot be captured by the capturing blade 35 before the cutting edge 34 of the inner blade 19, the protruding dimension T needs to be larger than zero. That is, the critical dimension of the projecting dimension T satisfies the inequality (0 <T <70 μm), so that the inner blade 19 can be used practically.

  Further, when the inequality satisfies (20 μm <T <60 μm), the whisker can be captured more reliably, the shaving can be performed, and the inner blade 19 that is optimal for practical use is obtained. The beard does not grow perpendicular to the skin surface, and the beard itself may be bent or fall down along the skin surface. The limit of the value is preferably a value exceeding 20 μm. Furthermore, even when the cross-section of the whiskers is elliptical, in order to surely avoid the capture blade 35 cutting the whiskers before the cutting edge 34 of the inner blade 19 contacts the whiskers, the projecting dimension T It is preferable that the upper limit of the value is less than 60 μm.

  The average daily growth of the beard is about 0.4 mm. Based on the growth dimension of the beard, the smaller the thickness dimension of the cutting blade 32, the more reliably the beard can be captured by the capturing blade 35. However, as the thickness dimension of the cutting blade 32 is thinner, the strength of the inner blade 19 is lowered, making it difficult to process and also causing a problem in durability. Conversely, as the thickness dimension of the cutting blade 32 increases, it becomes more difficult to capture the beard with the capturing blade 35.

  Therefore, the thickness dimension H of the cutting edge 32 only needs to satisfy the inequality (0.15 mm <H <0.4 mm). Since the amount of growth of the beard per day may exceed about 0.4 mm depending on the person, one limit value of the thickness dimension H may be less than 0.4 mm. Further, when the thickness dimension H of the cutting edge 32 is 0.15 mm or less, when the inner blade blank 50 is bent by a press machine, a part of the cutting edge 34 is lost or deformed. In some cases, the yield at the time of manufacturing the inner blade is remarkably lowered. Therefore, the limit value on the thin side of the thickness dimension H should be a value exceeding 0.15 mm. If the inequality (0.2 mm <H <0.3 mm) is satisfied, a more preferable inner blade 19 suitable for practical use can be obtained.

  10 and 11 show a modification of the capturing blade 35. FIG. In FIG. 10, a concave portion (friction increasing body) 44 is formed in a continuous wave shape along the leading edge of the capture blade 35, and the frictional resistance can be increased by increasing the chance of contact between the concave portion 36 and the whisker surface. The recess 36 can be formed by once forming the cutting edge 34 and then performing etching again on the tip edge of the capture edge 35. Further, if the resist film pattern provided on the surface of the sheet on the blade edge 34 side is formed in a continuous wave shape, the tip shapes of the blade edge 34 and the capture blade 35 can both be formed in a continuous wave shape. In FIG. 11, a fine powder of ceramic having a high frictional resistance is bonded and fixed to the surface of the sheet on the side of the trapping blade 35 to obtain a friction increasing body 44.

  In the above embodiment, the case where the present invention is applied to the main blade 10 has been described. However, the present invention can be applied to the inner center blade 11b. Further, the inner blade 32 in the above embodiment can form the trapping blade 35 by a so-called single-side etching method in which a resist film is formed only on one surface of the inner blade blank. In addition, when forming resist films having different pattern widths on both surfaces of the inner blade blank and performing double-sided etching, each of the angle θ1 of the blade edge 34 and the angle θ2 of the trapping blade 35 should be set to an arbitrary angle. Can do.

  The inner blade 19 provided with the capture blade 35 can be formed by a manufacturing form other than the etching method. For example, after the cutting blade 32 and the blade hole 33 are formed by precision pressing, a groove parallel to the blade hole 33 is formed on the non-sliding surface side of the cutting blade 32, and the entire inner blade blank is pushed in the thickness direction. By plastic deformation again so as to be crushed, the cutting edge width B1 on the non-sliding surface side is made larger than the cutting edge width B2 on the sliding surface side, and is captured on both sides of the cutting blade 32 on the non-sliding surface side. The blade 35 can be formed.

It is sectional drawing which shows a cutting blade structure. It is a front view of an electric razor. It is a vertical front view of a razor head. It is a vertical side view of the upper part of a razor head. It is a disassembled perspective view of a razor head. It is a disassembled perspective view of an inner blade. It is explanatory drawing which shows the bending process process of an inner blade notionally. It is a top view of only a part of the state which developed the inner blade. It is explanatory drawing which shows the cutting | disconnection operation | movement of an inner blade. It is explanatory drawing which shows another Example of a capture blade. It is sectional drawing which shows another Example of a capture blade.

Explanation of symbols

17 Outer blade 18 Sliding surface 19 Inner blade 32 Cutting blade 33 Blade hole 34 Cutting edge 35 Capture blade

Claims (4)

Each has a laterally long outer blade (17) that is retained in an inverted U shape and an inner blade (19) having a slit blade structure, and the inner blade (19) is a sliding surface of the outer blade (17) ( 18) an electric razor driven back and forth along
The inner blade (19) is alternately formed with an inverted U-shaped cutting blade (32) for cutting the whisker in cooperation with the outer blade (17) and a slit-shaped blade hole (33).
The cutting edge width (B1) on the non-sliding surface side of the cutting edge (32) is set to be larger than the cutting edge width (B2) on the sliding surface side, and the cutting edge (32) on the non-sliding surface side An electric razor characterized in that catching blades (35) for catching the whiskers in advance are formed on both sides of the shaver.   The protruding dimension from the cutting edge (34) provided on the sliding surface side of the cutting blade (32) to the trapping blade (35) provided on the non-sliding surface side of the cutting blade (32) is defined as (T). The electric shaver according to claim 1, wherein the front cutting edge widths (B1) and (B2) are set so that the inequality (0 <T <70 μm) can be satisfied.   The electric shaver according to claim 1 or 2, further comprising a friction-increasing body (36) for increasing a frictional resistance with the whiskers along a tip edge of the capturing blade (35).   The electric shaver according to claim 1 or 2, wherein the thickness dimension (H) of the cutting edge is set so as to satisfy the inequality (0.15mm <H <0.4mm).

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