JP4766536B2 - Shear blade - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shearing blade that cuts hair by moving a movable blade back and forth in the left-right direction with respect to a fixed blade.
[0002]
[Prior art]
This type of shearing blade is, for example, as shown in Japanese Patent Publication No. 57-12635, a movable blade having a large number of comb-shaped blades arranged in the left-right direction with respect to a fixed blade in which a large number of comb-shaped blades are arranged in the left-right direction. The hair is cut by reciprocating in the left-right direction.
[0003]
[Problems to be solved by the invention]
In such a shearing blade, cutting edges formed on the sliding contact surfaces of the fixed blade and the movable blade respectively cut the hair while sandwiching and supporting the hair. However, the conventional cutting edge cannot support the hair firmly.
[0004]
For this reason, the hair is slanted, and the hair may come out of the fixed blade or the movable blade or be cut obliquely, and there is a problem that the hair cannot be cut appropriately. In particular, with a comb-like blade in a shear blade of a hair clipper, the width becomes narrower toward the tip side and the gap between adjacent comb-like blades becomes wider, so that the hair easily escapes from between the comb-like blades. Further, it is necessary to prevent wear due to contact between the guide body that guides the reciprocating motion of the movable blade in the left-right direction and the fixed blade.
[0005]
An object of the present invention is to obtain a shearing blade that can cut hair reliably and appropriately. An object of the present invention is to ensure that the hair can be supported in order to maintain high cutting performance. An object of the present invention is to prevent wear due to contact between a guide body that guides a reciprocating motion of a movable blade in the left-right direction and a fixed blade.
[0006]
[Means for Solving the Problems]
As shown in FIGS. 2 to 5, the shear blade targeted by the present invention is fixed with a fixed blade 12 in which a large number of comb-shaped blades 15 are arranged in the left-right direction and a large number of comb-shaped blades 20 arranged in the left-right direction. And a movable blade 13 that reciprocates in the left-right direction with respect to the blade 12. Examples of the shear blade here include a clipper shear blade, an electric razor blade blade, a vellus cutter, an eyebrows cutter, and the like.
[0007]
According to the present invention, in such a shearing blade, as shown in FIG. 1, an edge portion 27 is formed to project at an intermediate position in the thickness direction of each comb-shaped blade 15 of the fixed blade 12, and each comb-shaped blade 15 of the fixed blade 12 is The gap between the edge portion 27 and the sliding surface 12a with respect to the movable blade 12 is formed in a concave shape, and an acute-angled blade edge 28 is formed on the sliding surface 12a side. Here, between the edge portion 27 and the sliding surface 12a includes a case where the concave portion is recessed by etching, a case where the concave portion is curved by polishing, and the like. The edge part 27 does not necessarily need to be sharp, and may have an arc shape in cross section as long as the hair 9 can be supported.
[0008]
More specifically, the comb blade 15 of the fixed blade 12 and the comb blade 20 of the movable blade 13 are provided with cutting edges 28 and 29 on the left and right sides of the sliding surfaces 12a and 13a, respectively. As shown, the angle α of the blade edge 29 of the comb blade 20 of the movable blade 13 is set to be smaller than the angle β of the blade edge of the comb blade 15 of the fixed blade 12.
[0009]
As for the formation position of the edge part 27, as shown in FIG. 1, the distance to the sliding surface 12a is shorter than the distance to the open surface 12b of the fixed blade 15. As shown in FIG. Comb blades 15 of the fixed blade 12 has a width of the formation position of the edge portion 27, and the width of the forming position of the cutting edge 28 has become equal properly.
[0010]
Further, as shown in FIG. 6, a protrusion 18 is disposed in a recess 17 formed on the sliding surface 12a side of the fixed blade 12, and the movable blade 13 has a guide body having a guide groove 22a extending in the left-right direction. 22 is fixed. By inserting the projection 18 into the guide groove 22a, the movable blade 13 is guided so as to reciprocate only in the left-right direction. Here, the guide body 22 is fixed to the movable blade 13 when the guide body 22 is formed in the through-hole or recess provided in the movable blade 13 by outsert molding, and the guide body 22 is formed in the through-hole or recess. This is the case when mating. The guide groove 22a corresponds to a case where the guide groove 22a is formed to be recessed in the guide body 22 and a case where the guide groove 22a is formed to penetrate the guide body 22.
[0011]
The tip portion 20a of the comb-shaped blade 20 of the movable blade 13, the left and right edge 29 as shown in FIGS. 5 and 12 have become flat row.
[0012]
[Effects of the invention]
When the hair 9 is cut by the fixed blade 12 and the movable blade 13, the shear blade according to the present invention has a hair tip 28 and an edge portion 27 of the comb blade 15 of the fixed blade 12 as shown in FIG. 13. Is supported at two points, so that the hair 9 is firmly supported. Accordingly, it is possible to prevent the hair 9 from being inclined and escaping from between the adjacent comb-shaped blades 15 of the fixed blade 12 and the hair 9 being cut obliquely. As a result, the hair 9 is cut reliably and appropriately.
[0013]
If the angle α of the cutting edge 29 of the comb-shaped blade 20 of the movable blade 13 is smaller than the angle β of the cutting edge 28 of the comb-shaped blade 15 of the fixed blade 12, the comb-shaped blade of the movable blade 13 that greatly contributes to the cutting of the hair 9. The 20 cutting edges 29 become sharp and the hair 9 can be accurately cut, and the cutting performance can be maintained high.
[0014]
In addition, because the angle β of the cutting edge 28 of the comb-shaped blade 15 of the fixed blade 12 is large, the contact area between the cutting edge 28 and the hair 9 increases, and the hair 9 is inserted into the cutting edge of the comb-shaped blade 15 of the fixed blade 12. 28 and the edge part 27 can support more reliably.
[0015]
If the distance to the sliding surface 12a is shorter than the distance to the open surface 12b of the fixed blade 15 in the formation position of the edge portion 27, the edge portion 27 and the blade edge 28 are close to each other. It is suppressed that 9 is curving between the edge part 27 and the blade edge | tip 28, and becomes diagonal with respect to the blade edge | tip 28, and contributes to the appropriate cutting | disconnection of the hair 9. FIG.
[0016]
Comb blades 15 of the fixed blade 12, when the width of the forming position of the width and the cutting edge 28 of the forming position of the edge portion 27 is made equal properly, the cutting edge 28 of the comb-shaped blade 15 of the fixed blade 12 and the hair 9 It can be supported substantially straight by the edge portion 27, and the hair 9 can be reliably prevented from being cut obliquely.
[0017]
When the protrusion 18 of the fixed blade 12 that is fitted in the guide groove 22a of the guide body 22 of the movable blade 13 and guides the reciprocating movement of the movable blade 13 in the left-right direction is disposed in the concave portion 17 of the fixed blade 12, Even if the guide body 22 protrudes from the movable blade 13 side to the fixed blade 12 side, since the guide body 22 enters the recess 17 of the fixed blade 12, contact between the guide body 22 and the fixed blade 12 is prevented. It is possible to prevent wear due to contact with the surface.
[0018]
The protrusion 18 is inserted into the guide groove 22a, so that the reciprocating motion of the movable blade 13 in the left-right direction is guided, and the movable blade 13 can perform the reciprocating motion accurately, thereby improving the sharpness of the shearing blade. be able to. Moreover, if the concave portion 17 is formed on the sliding surface 12a side of the fixed blade 12, the contact area between the fixed blade 12 and the movable blade 13 is reduced, so that the fixed blade 12 and the movable blade 13 are pressed against each other. Even if the urging force of the spring for this purpose is reduced, it can be surely brought into press contact. Furthermore, since the contact area is reduced, the frictional resistance can be reduced and the power consumption can be reduced.
[0019]
When the comb-shaped blade 20 tip left and right edge 29 of the 20a in the movable blade 13 is in the flat row, comb-shaped blade 20 between the hair 9 that enters the adjacent can come off obliquely along the edge 29 such as The hair 9 can be cut reliably.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The drawing shows an embodiment of a shearing blade according to the present invention. In FIG. 2, a motor 3, a battery 4, and the like are arranged inside a cylindrical main body case 1. A shearing blade 5 targeted by the present invention is disposed on the head portion 2 of the main body case 1. On the front surface of the main body case 1, there is a start switch 6 for turning on / off the energization of the motor 3 as shown in FIG.
[0021]
The main body case 1 has a driving mechanism for converting the rotational driving force of the motor 3 into a reciprocating motion in the left-right direction and transmitting it to the shearing blade 5. This drive mechanism is composed of an eccentric cam 7 connected to the output shaft of the motor 3 and a vibrator 8 connected to the shearing blade 5. The vibrator 8 protrudes from the eccentric position of the eccentric cam 7. The crankpin 7a reciprocates in the left-right direction.
[0022]
The shear blade 5 includes a fixed blade 12 fixedly supported on the head portion 2 of the main body case 1 via a holder 16 made of synthetic resin and the like, and the vibrator 8 via a movable blade fixing base 21 inside the upper surface of the holder 16. And a movable blade 13 that is reciprocated in the left-right direction. The movable blade 13 is always pressed and biased toward the fixed blade 12 by a pair of left and right torsion coil springs 14 and 14. The movable blade fixing base 21 is made of synthetic resin or the like, and is provided with a passive portion 21 a that receives the reciprocating motion of the vibrator 8. The holder 16, the fixed blade 12, the torsion coil springs 14, 14, the movable blade fixing base 21 and the movable blade 13 are integrally assembled into a unit, and the unitized shear blade 5 is attached to the head unit 2. Removably attached.
[0023]
The fixed blade 12 is a plate having a total thickness of, for example, 0.8 mm. As shown in FIG. 4, four caulking protrusions 16 a protruding from the holder 16 are provided on the fixed blade 12. The holder 16 is fixed by caulking through the through holes 12d.
[0024]
At the front end of the fixed blade 12, a plurality of comb-shaped blades 15 whose width gradually decreases toward the front end side are arranged in the left-right direction. The torsion coil spring 14 is attached to a holder 16 to which the fixed blade 12 is fixed. In order to reduce friction when the movable blade 13 slides, a concave portion 17 is formed on the sliding surface 12a of the fixed blade 12 with the movable blade 13 by half etching (etching from only one side). Yes. In the recess 17, a pair of protrusions 18, 18 protruding from the holder 16 protrude through the through holes 12 c, 12 c of the fixed blade 12.
[0025]
The movable blade 13 is made of a plate having a total thickness of, for example, 0.457 mm. As shown in FIG. 5, a plurality of comb-shaped blades 20 whose width gradually decreases toward the front end side as shown in FIG. Has been. The movable blade 13 is fixed to the movable blade fixing base 21 by caulking a caulking projection 21 b provided on the movable blade fixing base 21 through a through hole 13 c provided in the movable blade 13. One end of the torsion coil spring 14 is locked to the movable blade fixing base 21 (see FIG. 2). Then, the pressing urging force of the torsion coil spring 14 is transmitted to the movable blade 13 via the movable blade fixing base 21.
[0026]
The movable blade 13 is provided with a relief hole for a slide piece (guide body) 22 made of synthetic resin, and the slide piece 22 is formed in the relief hole by, for example, outsert molding. The slide piece 22 is provided with a pair of left and right lateral guide grooves 22a and 22a into which the tip ends of the protrusions 18 and 18 are respectively fitted.
[0027]
The movable blade 13 is guided and supported by the guide grooves 22a and 22a and the projections 18 and 18 such that the movable blade 13 can reciprocate only in the left-right direction. Further, since the protrusions 18 and 18 protrude through the through holes 12 c and 12 c of the fixed blade 12, the fixed blade 12 is firmly fixed to the holder 16 by the protrusions 18 and 18. Further, the protrusions 18 and 18 have an effect of preventing misalignment when the caulking protrusion 21b is caulked.
[0028]
The slide piece 22 may be welded and fixed to the movable blade 13. The guide grooves 22a and 22a may be through holes. Further, without providing the slide piece 22, the guide grooves 22 a and 22 a may be directly provided in the movable blade fixing base 21, and the projections 18 and 18 may be fitted into the guide grooves 22 and 18 through the escape holes of the movable blade 13. The protrusions 18 and 18 may be provided on the fixed blade 12.
[0029]
As shown in FIG. 6, the lower surface of the slide piece 22 slightly protrudes from the sliding surface 13 a side of the movable blade 13 with the fixed blade 12 to the fixed blade 12 side. It has entered into the recess 17 and the contact between the slide piece 22 and the fixed blade 12 is prevented. As shown in FIG. 6, the concave portion 17 is closed by the movable blade 13 to become a closed space, and has an effect of retaining the lubricating oil. Accordingly, the lubricating oil accumulated in the recess 17 is easily supplied to the fitting surfaces of the protrusions 18 and 18 and the guide grooves 22a and 22a in the recess 17, so that the reciprocating motion of the movable blade 13 can be performed smoothly. it can.
[0030]
The fixed blade 12 and the movable blade 13 are formed by an etching method using a quenched steel plate material, more preferably a quenched martensitic stainless steel plate material as a raw material. That is, for example, a film-like photosensitive film is baked and developed on the upper and lower surfaces of the previous plate material through a photomask, and a photo-etching method using a corrosion-resistant resist film 25 formed by patterning as shown in FIGS. To form. As the etching solution in this case, for example, ferric chloride is used. Various resist film 25 forming methods such as a method of directly irradiating the photosensitive film with a laser beam without using a photomask and curing the resist film 25 may be considered.
[0031]
By the etching method, the left and right side surfaces of each comb-like blade 15 of the fixed blade 12 are slid more than the dimension up to the open surface 12b which is in the middle of the thickness direction of the fixed blade 12 and touches the skin as shown in FIG. Edge portions 27 are formed so as to project at positions where the dimension to the moving surface 12a becomes shorter. The left and right side surfaces of each comb-shaped blade 15 are formed in a concave shape between the sliding surface 12a and the edge portion 27 and between the edge portion 27 and the open surface 12b, respectively.
[0032]
That is, in the resist film 25 forming the comb-shaped blade 15 of the fixed blade 12, for example, as shown in FIG. 7, the interval L1 between the adjacent comb-shaped blades 15 on the open surface 12b side is adjacent on the sliding surface 12a side. The distance L2 between the comb blades 15 is 1.5 times. When an etching solution is sprayed onto the plate material on which the resist film 25 is formed, etching proceeds while being recessed into a mortar shape simultaneously from both the open surface 12b side and the sliding surface 12a side.
[0033]
At this time, as the distance L1 on the open surface 12b side is larger than the distance L2 on the slide surface 12a side, the progress of the etching on the open surface 12b side becomes larger than that on the slide surface 12a side, and the open surface 12b. The boundary between the concave curved surface formed from the side and the concave curved surface formed from the sliding surface 12a side is a position closer to the sliding surface 12a. This boundary position is the position where the edge portion 27 is formed.
[0034]
By this etching, each of the comb blades 15 of the fixed blade 12 is formed with acute-angled blade edges 28 on the left and right sides on the sliding surface 12a side. As shown in FIG. 1, the comb-shaped blade 15 has substantially the same width at the formation position of the edge portion 27 and the width of the formation position of the blade edge 28, or the width of the cutting edge 28 is larger than the width of the formation position of the edge portion 27. The width of the formation position is slightly narrowed.
[0035]
The resist film 25 forming the comb-shaped blade 20 of the movable blade 13 is adjacent to the adjacent comb-shaped blade 20 on the open surface 13b side which is the surface opposite to the sliding surface 13a with the fixed blade 12, as shown in FIG. The interval L3 is set to be three times the interval L4 between the adjacent comb-shaped blades 15 on the sliding surface 13a side. When the etching solution is sprayed onto the plate material on which the resist film 25 is formed, the left and right side surfaces of the comb-shaped blade 20 are formed in concave shapes, but the degree of progress of the etching on the open surface 13b side is compared with that on the sliding surface 13a side. Therefore, the boundary between the concave curved surface formed from the open surface 13b side and the concave curved surface formed from the sliding surface 13a side is almost at the position on the sliding surface 13a side. However, there is no edge at the boundary here.
[0036]
By this etching, sharp blade edges 29 are formed on each comb blade 20 of the movable blade 13 on the left and right sides on the sliding surface 13a side. As shown in FIG. 9, the angle α of the cutting edge 29 is 60 °, for example, and is smaller than the angle β of the cutting edge 28 of the comb-shaped blade 15 of the fixed blade 12. The angle β of the cutting edge 28 of the comb blade 15 is, for example, 80 °.
[0037]
The tip of each comb-like blade 15 of the fixed blade 12 is polished or etched in an inclined manner from the open surface 12b side to the sliding surface 12a side as shown in FIG. The degree of narrowing of the width W1 on the open surface 12b side of the blade 15 is greater than the degree of narrowing of the width W2 of the formation position of the edge portion 27. As a result, the side touching the skin, that is, the edge at the tip of the open surface 12b side of the comb blade 15 can be prevented from being caught on the skin, and the hair 9 can be scraped smoothly. Can be cut.
[0038]
As shown in FIG. 10, the tip of each comb blade 20 of the movable blade 13 is polished or etched in an inclined manner from the open surface 13b side to the sliding surface 13a side. Further, as shown in FIGS. 5 and 12, the left and right blade edges 29 of the tip 20a on the sliding surface 13a side of the comb-like blade 20 are equal and the left and right blade edges 29 are substantially parallel. This prevents hair that has entered between adjacent comb-shaped blades 20 from slipping out obliquely along the blade edge 29.
[0039]
As shown in FIGS. 4 and 5, oil sump recesses 10 and 11 are formed at the base ends of the comb-shaped blades 15 and 20 on the sliding surfaces 12a and 13a side of the fixed blade 12 and the movable blade 13, respectively. Yes. These oil sump recesses 10 and 11 are formed by an etching method when the outer lines of the fixed blade 12 and the movable blade 13 are formed. The fixed blade 12 and the movable blade 13 are formed not only by the comb-shaped blades 15 and 20, but also by an etching method such as outlines, through-holes, and dents. That is, the entire fixed blade 12 and movable blade 13 are processed by forming a flat stainless steel plate material or the like by the etching method as described above, and can be made thinner than the case of forming them by press processing. As a result, a compact shear blade 5 can be provided.
[0040]
Then, as the movable blade 13 reciprocally slides left and right with respect to the fixed blade 12, the hair 9 has a cutting edge 28 of the comb-shaped blade 15 of the fixed blade 12 and a comb-shaped blade of the movable blade 13 as shown in FIG. 13. It is cut while being sandwiched between 20 cutting edges 29. At this time, since the hair 9 is supported in a substantially straight state by the cutting edge 28 and the edge portion 27 of the comb-shaped blade 15 of the fixed blade 12, the movable blade 13 and the fixed blade 12 eat at a substantially right angle with respect to the hair 9. Include. Accordingly, the hair 9 is not inclined and escapes from between the adjacent fixed blades 12, and the hair 9 can be cut reliably.
[Brief description of the drawings]
1 is a cross-sectional view taken along line AA in FIG. 2 showing the shear blade of the present invention. FIG. 2 is a cross-sectional plan view of the entire clipper to which the shear blade of the present invention is applied. Longitudinal side view [Figure 4] Plan view of the fixed blade attached to the holder as seen from the sliding surface side [Figure 5] Bottom view of the movable blade fixed base as seen from the sliding surface side with the movable blade attached FIG. 6 is a longitudinal sectional view mainly showing the relationship between the protrusion on the fixed blade side and the slide piece on the movable blade side. FIG. 7 is a cross-sectional view for explaining the etching process of the fixed blade. FIG. 9 is a cross-sectional view illustrating the angle of the blade edge of the fixed blade and the movable blade. FIG. 10 is a side view illustrating the tip of the fixed blade and the movable blade. Enlarged view of the blade as viewed from the open surface side. [Fig. 12] Enlarged view of the comb blade of the movable blade as viewed from the open surface side. Cross-sectional view illustrating a disconnected state EXPLANATION OF REFERENCE NUMERALS
5 Shearing blade 9 Hair 12 Fixed blade 12a Sliding surface 12b Open surface 13 Movable blade 13a Sliding surface 13b Open surface 15 Fixed blade comb-shaped blade 17 Recess 18 Projection 20 Movable blade comb-shaped blade 22 Slide piece 27 Edge portion 28 Fixed blade edge 29 Movable blade edge

Claims (6)

A fixed blade (12) in which a large number of comb-shaped blades (15) are arranged in the left-right direction, and a large number of comb-shaped blades (20) are arranged in the left-right direction to reciprocate in the left-right direction with respect to the fixed blade (12). at a shear blade and a movable blade (13) for moving, at an intermediate position in the thickness direction of the comb-shaped blades (15) of the fixed blade (12), the edge portion (27) is formed to project, the fixed blade ( each comb blade 12) (15), between the sliding surface (12a) edge portion (27) relative to the movable blade (12) is formed in the concave shape, the sliding surface (12a) side A shearing blade characterized in that an acute-angled blade edge (28) is formed on the blade. The comb blade (15 ) of the fixed blade (12) and the comb blade (20) of the movable blade (13) are provided with cutting edges (28, 29) on the left and right sides of the sliding surfaces (12a, 13a). The angle (α) of the blade edge (29) of the comb blade (20) of the movable blade (13) is the angle (β) of the blade edge (28) of the comb blade (15) of the fixed blade (12 ). The shearing blade according to claim 1, wherein the shearing blade is set smaller. The shearing blade according to claim 1, wherein the edge portion (27) is formed such that the distance to the sliding surface (12a) is shorter than the distance to the open surface (12b ) of the fixed blade (15) . Comb-shaped blade of the fixed blade (12) (15), the width of the forming position of the edge portion (27), shearing blade according to claim 1, wherein the width of the forming position of the cutting edge (28) becomes equal properly. A protrusion (18) is disposed in a recess (17) formed on the sliding surface (12a) side of the fixed blade (12) , and a guide groove (22a) extending in the left-right direction is provided in the movable blade (13 ). A guide body (22) having a fixed shape is fixed, and the protrusion (18) is inserted into the guide groove (22a) , whereby the movable blade (13) reciprocates only in the left-right direction with respect to the fixed blade (12) . The shear blade according to claim 1, wherein the shear blade is guided to move. Comb blade (20) tip of (20a), the shearing blade according to claim 1, wherein the left and right edge (29) is in a flat row of the movable blade (13).

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