JP4767461B2 - Shear blade - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shearing blade in which a fixed blade and a movable blade slide in surface contact. The fixed blade and the movable blade are formed by an etching method, and are applied to an eyebrows cutter, an electric razor blade blade, a hair cutter, a clipper blade, or the like.
[0002]
[Prior art]
For example, it is known to form a shearing blade by an etching method in an electric razor blade (Japanese Patent Publication No. 36-19556). Japanese Patent Laid-Open No. 1-259891 discloses that a fixed blade and a movable blade are formed by a photoetching method.
[0003]
[Problems to be solved by the invention]
The blade formed by the etching method can be made thinner than the blade formed by press working, and high surface accuracy can be obtained because no distortion remains during processing. Therefore, the sharpness at the time of shearing can be improved by bringing the blade surfaces of the fixed blade and the movable blade into close contact with each other. The problem is that if both the fixed blade and the movable blade are formed into a flat plate shape by an etching method, the contact area between the both increases, and the frictional resistance increases accordingly. In order to avoid such a situation, the applicant has previously proposed that a concave portion is formed on the sliding surface side of the fixed blade or the movable blade by an etching method.
[0004]
The flat steel material that is an etching material is pre-quenched in order to ensure hardness. The steel material after quenching is subjected to bending stress in the steel material. When the concave portion is formed there by etching, the entire fixed blade including a large number of comb blade portions is curved (see FIG. 16), and the sliding contact with the comb blade portion of the movable blade becomes local. The hair cannot be sheared efficiently. In addition, the heat generated by the local sliding contact may cause the user to feel uncomfortable.
[0005]
An object of the present invention is to obtain a shearing blade capable of reliably and appropriately cutting the hair so that the comb-shaped blade portions formed on the fixed blade and the movable blade can be in close contact with each other.
[0006]
[Means for Solving the Problems]
The shear blade targeted by the present invention includes 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 in the left-right direction with respect to the fixed blade 12. And a movable blade 13 that reciprocally slides. 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]
In the shear blade, as shown in FIGS. 1A and 1B, the present invention is configured so that at least one of the sliding surfaces 12a and 13a of the fixed blade 12 and the movable blade 13 formed by an etching method is slid. A recess 17 that avoids sliding contact with the moving partner is formed, and a through hole 45 is formed in the recess 17.
[0008]
More specifically, the through holes 45 are arranged in a row in the left-right direction.
[0009]
Further, a through hole 12c through which the protrusion 18 is inserted is disposed in a concave portion 17 formed on the sliding surface 12a side of the fixed blade 12, and the movable blade 13 has a guide groove 22a extending in the left-right direction. 22 is fixed, and the projection 18 is inserted into the guide groove 22a, whereby the movable blade 13 is guided to reciprocate only in the left-right direction with respect to the fixed blade 12.
[0010]
The through holes 45 are arranged in a row in the left-right direction with reference to the through holes 12c through which the protrusions 18 are inserted.
[0011]
Further, the movable blade 13 is curved or bent toward the fixed blade 12 side.
[0012]
[Effects of the invention]
The shear blade according to the present invention forms a recess 17 that avoids sliding contact with a sliding partner on at least one of the sliding surfaces 12a and 13a of the fixed blade 12 and the movable blade 13 formed by an etching method, respectively. In addition, by forming the through-hole 45 in the concave portion 17, it is possible to reduce bending stress that tends to bend around an axis along the axis in the direction orthogonal to the left-right direction, and the fixed blade 12 and the movable blade 13 can be slidably contacted with each other evenly in the left-right direction. As a result, the comb-shaped blades 15 and 20 formed on the fixed blade 12 and the movable blade 13 can also slide evenly in close contact, so that the hair that is the object to be cut can be cut reliably and appropriately.
[0013]
Further, since the through holes 45 are arranged in a line in the left-right direction, it is possible to prevent the bending stresses from being efficiently and evenly applied to the comb-shaped blades 15, 20 arranged in the left-right direction.
[0014]
Further, a through hole 12c through which the protrusion 18 is inserted is disposed in a concave portion 17 formed on the sliding surface 12a side of the fixed blade 12, and the movable blade 13 has a guide groove 22a extending in the left-right direction. 22 is fixed, and the projection 18 is inserted into the guide groove 22a, whereby the movable blade 13 is guided so as to reciprocate only in the left-right direction with respect to the fixed blade 12. Therefore, the guide body 22 is moved to the movable blade 13. Even if it protrudes from the side to the fixed blade 12 side, the contact between the guide body 22 and the fixed blade 12 is prevented by entering this into the concave portion 17 of the fixed blade 12, so that wear due to these contacts is improved. Can be prevented. Further, 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, a contact pressure that is the same as that when setting the spring pressure for full contact can be obtained, so that frictional resistance can be reduced and power consumption can be reduced. Furthermore, since the through hole 12c can function as the through hole 45 for preventing bending stress, it is advantageous in terms of securing the strength.
[0015]
Further, since the through holes 45 are arranged in a row in the left-right direction with respect to the through holes 12c through which the protrusions 18 are inserted, a straight through hole 45 including the through holes 12c is formed. An efficient and uniform bending stress can be prevented from being applied to the comb-shaped blade 15.
[0016]
In addition, by bending or bending the movable blade 13 toward the fixed blade 12 side, the strength of the movable blade 13 can be improved, and no gaps are generated in the comb-shaped blades 15 and 20 part. The hair which is a cutting object can be cut reliably and appropriately. Moreover, even if a bending stress that tends to bend around an axis along a direction perpendicular to the left-right direction can be prevented as much as possible, it can be prevented as much as possible. Contact can be made uniformly. Thereby, uneven wear and cutting failure can be reliably prevented.
[0017]
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.
[0018]
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.
[0019]
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.
[0020]
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.
[0021]
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.
[0022]
1A, 1B, and 4, a plurality of comb-shaped blades 15 whose width gradually decreases toward the front end side are arranged in the left-right direction at the front end of the fixed blade 12. FIG. The torsion coil spring 14 is attached to a holder 16 to which the fixed blade 12 is fixed. In order to reduce friction during sliding between the fixed blade 12 and the movable blade 13, a recess 17 is formed on the sliding surface 12a side of the fixed blade 12. The recess 17 is formed in parallel with the formation of the outline of the fixed blade 12. That is, only the sliding surface side is dissolved in the thickness direction of the stainless steel plate as an etching material with an etching solution, and the other plate surface is coated with a resist film. Thus, when the engraving from one side is performed and the contour line of the fixed blade 12 is completed, about half of the plate thickness is melted to obtain the concave portion 17 formed of a shallow recess. The depth of the recess 17 in this embodiment was about 0.5 mm. A pair of protrusions 18 projecting from the holder 16 protrude through the through holes 12 c of the fixed blade 12 in the recess 17. The through-holes 12c are formed by performing inscription in the thickness direction from the front and back of the corresponding portions and the pattern portions where the resist film 25 does not exist. 1A is a plan view seen from the sliding surface 12a side of the fixed blade 12 of this embodiment, and FIG. 1B is a cross-sectional view taken along the line BB in FIG. 1A.
[0023]
The recess 17 has a through hole 45 formed by the same method as the through hole 12c. As shown in FIGS. 1 and 4, the through holes 45 are formed in a row in the left-right direction with reference to the through holes 12 c. That is, the through holes 12c and the through holes 45 are arranged in a straight line. As a result, the bending stress (arrow shown in FIG. 16) which is generated when the concave portion 17 is formed in the fixed blade 12 and is about to be bent about the axis along the axis in the direction orthogonal to the left-right direction can be reduced. The local sliding contact between 12 and the movable blade 13 can be prevented, and as a result, the hair as the object can be cut reliably and appropriately.
[0024]
Further, since the through hole 12c is used as the through hole 45 for preventing bending stress, it is advantageous in terms of securing the strength. In other words, forming the through holes 12c for the protrusions 18 in the portions other than the recesses 17 increases the total area of each through hole and inevitably reduces the strength, but the through holes 12c are formed in the recesses 17. This is because the total area of each through hole can be reduced. Moreover, since the through-hole 12c and the through-hole 45 are arranged in a straight line, it is possible to effectively prevent the bending stress from being applied to the comb-shaped blades 15 arranged in the left-right direction.
[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 47 for a slide piece (guide body) 22 made of synthetic resin, and the slide piece 22 is formed in the relief hole 47 by, for example, outsert molding. The slide piece 22 is provided with a pair of left and right horizontally extending guide grooves 22a into which the tip ends of the protrusions 18 are respectively inserted. Also in the movable blade 13, as with the fixed blade 12, the outline, the through hole 13c, and the escape hole 47 are formed by an etching method.
[0027]
The movable blade 13 is guided and supported by the guide groove 22a and the projection 18 so as to be able to reciprocate only in the left-right direction. Further, since the protrusion 18 protrudes through the through hole 12 c of the fixed blade 12, the fixed blade 12 is firmly fixed to the holder 16 by the protrusion 18. Further, the protrusion 18 has an effect of preventing displacement when the caulking protrusion 21b is caulked.
[0028]
The slide piece 22 may be welded and fixed to the movable blade 13. The guide groove 22a may be a through hole. Further, without providing the slide piece 22, the guide groove 22 a may be directly provided in the movable blade fixing base 21, and the protrusion 18 may be fitted into the guide groove 22 a through the escape hole 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.
[0030]
The through-hole 12c and the through-hole 45 may be in communication with each other if the use at the time of caulking the through-hole 12c is not considered. This is more effective for preventing bending stress.
[0031]
As indicated by the specific numerical values, the movable blade 13 is formed thinner than the fixed blade 12. The reason is to reduce the vibration during the reciprocating motion as much as possible by reducing the weight of the movable member. Moreover, there is also an advantage that the movable blade 13 is flexible and easily adheres to the fixed blade 12 by being formed thin.
[0032]
After the movable blade 13 is formed by an etching method, a curved portion or a bent portion is formed by pressing at a midpoint in the front-rear direction. Specifically, as shown in FIG. 15 (a), a fixed receiving jig 48 having an arc surface (in the case of forming a bent portion on the movable blade 13, of course, a receiving jig having a bent surface is used). Then, the movable blade 13 is processed so that the cross section in the front-rear direction becomes upwardly convex by pressing from above and below with a U-shaped pressing jig 49 movable in the direction of the arrow. The ridge line of the receiving jig 48 is located at the chain line portion in FIG. FIG. 15B is a cross-sectional view schematically showing the movable blade 13 after pressing. In the figure, X is the longitudinal length of the movable blade 13, and is about 30 mm in the embodiment. In the figure, Y indicates the distance to the maximum bending point (or bending point) of the upward convex portion with respect to the reference line connecting the front end and the rear end of the movable blade 13, and is set to 10 μm to 20 μm in the embodiment. It is.
[0033]
The problem with the conventional movable blade is that the movable blade 13 is inevitably formed thin as described above in a state where the movable blade 13 is mounted on the fixed blade 12 side and the movable blade 13 is pressed by the spring 14. Therefore, due to the pressing biasing force, the movable blade 13 is curved so as to be convex downward, and a slight gap is formed on the comb blade 15 side, resulting in a decrease in cutting ability. It was. On the other hand, if the spring pressure is reduced, the downward convex curvature is reduced, but the pressing force applied to the comb-shaped blades 15 and 20 is lowered, and the cutting ability is lowered. Therefore, as described above, the movable blade 13 is provided with an upward convex curved portion or bent portion having a fold line portion (ridge line portion of a one-dot chain line in FIG. 5) in the same direction as the axis along the horizontal direction of the movable blade 13. The strength against bending increases, and even when a pressing biasing force is applied by the spring, it is difficult to deform, so there is no lifting phenomenon on the comb blade 15 side, and an appropriate pressing force can always be applied, and the cutting force is reduced. Can be eliminated. Moreover, since the contact pressure in the comb blades 15 and 20 can be increased, the cutting ability is further improved. Of course, if the pressing biasing force is applied, it will be deformed to some extent, but in that case, the value of the bending (Y value in FIG. 15 (b)) or the pressing force of the spring so as to maintain the degree of bending to at least the horizontal position. Must be set. FIG. 6 showing a cross-sectional view after the blade unit is assembled shows a state where the movable blade 13 is bent by the pressing biasing force of the spring 14 and the movable blade 13 is kept horizontal in the front-rear direction. Of course, it may be curved or bent slightly upwardly convex, which is convenient because the contact pressure of the comb blades 15 and 20 increases.
[0034]
By the etching method, the left and right side surfaces of each comb-shaped 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.
[0035]
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.
[0036]
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.
[0037]
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.
[0038]
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.
[0039]
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 °.
[0040]
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.
[0041]
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.
[0042]
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 the movable blade 13 are processed by forming a flat stainless steel plate material or the like by an etching method as described above, and can be made thinner than when these are formed by pressing, Less distortion. As a result, a compact shear blade 5 can be provided.
[0043]
In FIG. 1 and FIG. 4, minute recesses 50 and 51 (not through holes) scattered on the sliding surface 12a are provided to further reduce the sliding resistance.
[0044]
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]
FIG. 1 is a view showing a fixed blade according to 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. FIG. Plan view of the fixed blade attached as seen from the sliding surface side. [Fig. 5] Bottom view of the movable blade fixed base as seen from the sliding surface side with the movable blade attached. [Fig. 6] Mainly from the fixed blade side. FIG. 7 is a sectional view for explaining the etching process of the fixed blade. FIG. 8 is a sectional view for explaining the etching process of the movable blade. 9 is a cross-sectional view showing the angles of the blades of the fixed blade and the movable blade. FIG. 10 is a side view showing the tips of the fixed blade and the movable blade. FIG. 11 is an enlarged view of the comb blade of the fixed blade viewed from the open surface side. [Fig. 12] An enlarged view of the comb-like blade of the movable blade as viewed from the open side. [Fig. 13] Explains the cutting state of the hair. Figure [EXPLANATION OF SYMBOLS] showing a cross-sectional view and FIG. 14 A-A sectional view taken along line in FIG. 2 and FIG. 15 is a schematic view showing a press process of the movable blade [16] of the plate-like blade bending stress that
5 Shearing blade 9 Hair 12 Fixed blade 12a Sliding surface 12b Open surface 12c Through-hole 13 Movable blade 13a Sliding surface 13b Open surface 15 Fixed blade comb-shaped blade 17 Recess 18 Protrusion 20 Movable blade comb-shaped blade 22 Slide piece 27 Edge portion 28 Fixed blade edge 29 Movable blade edge 45 Through hole

Claims (4)

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 and reciprocally slide in the left-right direction with respect to the fixed blade (12). A shearing blade having a movable blade (13)
The fixed blade (12) and the movable blade (13) are each formed by an etching method, and at least one of the sliding surfaces of both the blades (12) and (13) is a recess that avoids sliding contact with the sliding partner. A shearing blade characterized by forming (17) , forming through holes (45) in the recesses (17) , and arranging the through holes (45) in a line in the left-right direction . A through hole (12c) through which the protrusion (18) is inserted is disposed in a recess (17) formed on the sliding surface (12a) side of the fixed blade (12). A guide body (22) having a guide groove (22a) extending in the direction is fixed, and a protrusion (18) is fitted into the guide groove (22a), so that the movable blade (13) with respect to the fixed blade (12). The shearing blade according to claim 1 , wherein the blade is guided so as to reciprocate only in the left-right direction . The shearing blade according to claim 1 or 2 , wherein the through holes (45) are arranged in a row in the left-right direction with reference to the through holes (12c) through which the protrusions (18) are inserted . The shearing blade according to any one of claims 1 to 3 , wherein the movable blade (13) is curved or bent toward the fixed blade (12) .

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