JPH10323461A - Inner blade for reciprocating type cutting hand tool and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the easily manufacturable light-weight inner blade of a reciprocating type electric razor excellently fitted to an outer blade for easily generating cutting sound at the time of use. SOLUTION: This inner blade 51 of the reciprocating type electric razor for cutting objects passed to blade holes by being slid on the inner surface of the outer blade in a curved planar shape provided with many blade holes is provided with a curved part 54 formed by one metallic plate curved in a direction for orthogonally crossing the direction of sliding along the inner surface of the outer blade and a pair of blade plate base parts 55 respectively provided on both sides of the curved part. The curved part 54 is provided with many mutually parallel blade parts 56 extended in the direction for crossing the direction of sliding for which both ends are integrally connected to the blade base parts 55 and both sides of an outer peripheral edge form a blade tip 58 and a gap 57 provided between the blade parts 56 for communicating the inside and outside of the curved part 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating method for cutting a beard, a hair ball, etc., which are passed through the blade holes by sliding the inner surface of a curved plate-shaped outer blade having a large number of blade holes. The present invention relates to an inner blade provided in a reciprocating cutter hand tool such as a dynamic electric shaver or a pill remover, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIG. 21, a conventional reciprocating electric shaver is configured such that a top cover 3 is screwed to an upper end portion of a main body case 2 in which a motor 1 is built, and the cover 3 and the main body case 2 are connected to each other. In the space between the upper end, the motor 1
The inner blade driver 5 is fitted to the drive shaft 4 that is eccentrically rotated by the drive shaft 4 and reciprocates in the width direction of the main body case 2 with the eccentric rotation of the drive shaft 4. An inner blade holder 7 is removably inserted into an inner blade mounting shaft 6 protruding from the center of the driver 5 to the outside of the top cover 3.

A frame body 8 is attached to the main body case 2 so as to cover the top cover 3. This frame body 8
Is a lower frame 8a which can be attached to and detached from the top cover 3 upward through a hook release button 9;
and the upper frame 8b connected to the upper side of the upper frame 8a. A plate-shaped outer blade 10 having a large number of blade holes and being curved is attached to the upper frame 8b. In the example shown in FIG. 21, a pair of outer blades 10 are provided, which are fixed at one side to a central edge member 10 a engaged with the upper frame 8 b, and are connected to the edge member 10 b attached to the other end. 8b is held in a curved state in which it is hooked on the concave portion on the inner surface of the inner surface 8b and protrudes upward.

A pair of inner blades 12 individually corresponding to each outer blade 10 are supported on the inner blade holder 7 so as to be vertically movable. As shown in FIG. 22, each of the inner blades 12 includes a central tube 13 extending in the width direction of the main body case 2, an inner blade base 14, and a plurality of inner blade plates 15 forming a blade portion.

The center tube 13 is made of metal, the inner blade base 14 is made of synthetic resin or light metal, and each inner blade plate 15 is made of stainless steel for cutting tools. Each of the inner blade plates 15 has a substantially semicircular shape, and a cross-shaped hole 15c provided at a substantially central portion thereof
3 and is attached at a predetermined interval in the axial direction of the central tube 13. The inner cutter base 14 embeds the entire center tube 13 and the lower part of each inner cutter plate 15, and integrally connects the center tube 13 and each inner cutter plate 15.

The inner blade 12 has a spring 16 disposed below the inner blade 12.
And the outer peripheral end surface of the inner blade plate 15 is
Is pressed against the inner surface of the Accordingly, in this electric shaver, when the motor 1 is operated to reciprocate the inner blade driver 5, the inner blade 12 slides on the inner surface of the outer blade 10. Inner blade plate 1 of inner blade 12
By cutting between the blade hole 5 and the blade hole of the outer blade 10, shaving can be performed.

Further, the inner blade 12 having the above-described structure shown in FIG.
Is manufactured by the following procedure. First, cutting edges 17 are formed on both sides of the arc-shaped outer peripheral edge of each inner blade plate 15. This cutting edge forming step is performed by pressing or etching the outer peripheral portion of the inner blade plate 15. In FIGS. 22 to 24, reference numeral 18 denotes a cross section substantially V formed on both surfaces of the inner blade plate 15 by the above processing.
2A, and a slope 18a (FIG. 2)
4) and the outer peripheral end surface 15a of the inner blade plate 15 connected thereto.
Thus, a cutting edge 17 forming an acute angle is formed. Also, each inner blade plate 1
5 is subjected to a quenching treatment after the formation of the cutting edge 17.

Next, after a predetermined number of inner blade plates 15 are fitted into the jigs (not shown) having inner blade plate setting grooves at predetermined intervals, the predetermined number of the positioned inner blade plates are set. The center tube 13 is inserted into the fifteen opposed cross-shaped holes, and the height positions of the predetermined number of inner blade plates 15 are aligned based on the center tube 13.

Thereafter, a predetermined number of inner blade plates 15 held together with the central tube 13 are taken out of the jig, set in an insert mold (not shown), and then clamped to perform insert molding.

Further, the integrated product obtained by the insert molding (this is shown in FIG.
(A) (B) The outer peripheral portion of the inner blade plate 15 is polished to a polishing line A indicated by a dashed line in the middle. Note that the shaving depth B in this blade edge polishing is about ４ of the width C of the recess 18. The inner blade 12 is manufactured by the above procedure.

[0011]

In the conventional method of manufacturing the inner cutter 12, as described above, it is necessary to provide the recesses 18 individually for a large number of inner cutter plates 15, and these inner cutters are required. The time required for insert molding of the plate 15 is also necessary. In particular, in this molding, each jig is attached to the jig.
Must be set one by one. Since such a lot of labor is required, there is a problem that the production of the inner blade 12 is troublesome and the cost is high.

In addition, since the height of each inner blade plate 15 after insert molding of the inner blade 12 varies, the defect rate of the inner blade 12 is high. That is, specifically, the case where the thickness of the inner blade plate 15 is 0.3 mm, the maximum depth of the recess 18 is 1.0 mm, and the angle α (see FIG. 23A) of the blade edge 17 is 60 degrees. explain.

The condition that the cutting edge angle α is 60 degrees in the inner blade plate 15 is calculated from the outer peripheral end face 15a by 0.1 degree.
Since it is 27 mm, the polishing line A must be set within this range. However, due to variations in the depth of the recesses 18 and variations in the height of each of the inner blade plates 15 set in the insert mold, the height of the outer peripheral end surface 15a of each of the inner blade plates 15 in a state before polishing is performed. Since the position varies, the part that can be actually polished is 0.127 m
even less than m.

Under such circumstances, for example, as shown in FIG.
In the state where the variation D of m has occurred, if the polishing is performed up to the polishing line A having a maximum height of 0.127 mm in accordance with the outer blade plate 15a1 having a lower height, the result is as shown in FIG. The blade edge is hardly formed on the middle inner blade plate 15a2 (this is the highest inner blade plate).
It will be bad.

Therefore, in order to minimize the occurrence of such defects, the central pipe 13 for positioning each inner blade plate 15 is provided.
In addition to the above, there is a need to frequently repair the insert mold, and this also raises a problem that the manufacturing cost is increased.

Accordingly, a first object of the present invention is to provide a method for manufacturing an inner blade of a reciprocating cutting tool which can easily and inexpensively manufacture the inner blade.

In the conventional manufacturing method, the sharp edge 17
The V-shaped recess 18 is formed in the inner blade plate 15 as a premise to obtain the following. However, the depth of the recess 18 formed on both surfaces of the inner blade plate 15 having a thickness of about 0.3 mm must be shallow. Accordingly, the angle α of the cutting edge 17 (see FIG. 23 (A)) is accordingly large, and at present, it is not possible to provide the cutting edge 17 having an acute angle smaller than approximately 60 degrees.

Accordingly, a second object of the present invention is to provide a method for manufacturing an inner blade of a reciprocating cutting tool which can reduce the angle of the cutting edge while solving the first problem.

A third object of the present invention is to provide a method of manufacturing an inner blade of a reciprocating cutting hand tool capable of further improving productivity in solving the first or second problem. Is to get

Further, when the inclined surface 18a of the recess 18 forming the cutting edge 17 is provided by etching as described above together with the outer peripheral end surface 15a of the inner blade plate 15, the inclined surface 1
Since the finishing accuracy of 8a is poor, there is a problem that cut whiskers and the like easily adhere thereto and the sharpness is not good.

Therefore, a fourth object of the present invention is to solve the above-mentioned first or third problem and to manufacture an inner blade of a reciprocating cutting hand tool capable of manufacturing an inner blade capable of improving sharpness. Is to get the way.

Further, the conventional inner blade 12 requires the center tube 13, the inner blade base 14, and a large number of inner blade plates 15, so that the manufacturing is troublesome as described above, However, there is a problem that it is complicated and heavy. In addition, each inner blade plate 15 is provided at right angles to the outer blade 10. In other words, since the outer blades 10 are arranged along the direction of the force for deforming the outer blades 10, the dents are deformed when a part of the outer blades 10 is locally pressed and deformed. It cannot follow the inner surface of the outer blade and deform. Therefore, there is a problem that the familiar state with the outer cutter 10 cannot always be maintained in an optimal state. Moreover, as described above, the inner blade plate 15 which is perpendicular to the outer blade 10 and whose central portion is supported by the inner blade base 14 is unlikely to bend, so that the cutting noise during cutting is unlikely to appear. Therefore, there is also a problem that it is difficult to obtain a real feeling that a beard or the like is being cut.

Therefore, a fifth problem to be solved by the present invention is that the reciprocating type is easy to manufacture, lightweight, has good adaptability to the outer blade, and easily produces a cutting sound when used. It is to obtain the inner blade of a cutting hand tool.

A sixth object of the present invention is to provide an inner blade of a reciprocating cutting tool which can further improve the quality in solving the fifth problem.

A seventh object of the present invention is to provide an inner blade of a reciprocating cutting tool which can be made compact in order to solve the fifth object.

[0026]

According to a first aspect of the present invention, there is provided a method according to the first aspect, comprising: an inner blade base; and an inner blade plate connected to the inner blade base. A method for manufacturing an inner blade of a reciprocating cutting hand tool which slides an inner surface of a curved outer blade having a number of blade holes and cuts the one passed through the blade hole, comprising: An unevenness providing step of alternately forming a number of convex ridges extending in a direction intersecting with the sliding direction on at least one surface of a metal blank and concave ridges adjacent thereto, and positioning the one surface inside. A bending step of bending the blank in a direction orthogonal to the sliding direction, and polishing the outer surface of a curved portion of the blank to separate the blade portions formed of the protruding ridge portions projecting inside the curved portion from each other. A polishing step of forming a cutting edge on each side of the outer peripheral edge of these blade portions; , An assembly step of attaching the inner cutter base the inner cutter plate made of the blank is curved in a direction perpendicular to the direction of the slide that is obtained by including a. In the method of the present invention, the concave portion formed on the inner surface of the curved portion by the unevenness providing step may be a notch formed of an elongated notch having a bottom or an elongated notch having no bottom, or a press. It may be a concave portion formed by a concave portion formed into a waveform by molding.

In the method according to the first aspect of the present invention, a flat metal blank is alternately formed with a large number of ridges and valleys and then curved, and then the outer surface of the curved portion is polished. By this, the blades made of the ridges protruding inside the curved portion are separated from each other, and at the same time, the blades are formed on both sides of the outer peripheral edge of these blades. There is no need to provide a recess for forming, and there is no need for insert molding, and various labors related to this molding (individual setting work for the mold, molding work, repair work for the mold, etc.) can be omitted. . Therefore, the inner blade can be manufactured with a smaller number of man-hours than before. In addition, the curved portion obtained by bending a single plate has no variation in the tip position of each blade portion before polishing, or is extremely small. Can be secured large.

According to a second aspect of the present invention, there is provided a method according to the second aspect, wherein the step of providing the concave and convex portions comprises connecting the outer peripheral edge of the blade portion with the convex ridge portion. An inclined surface having an acute angle is formed in the concave streak portion, and the polishing step is polished to a depth reaching the inclined surface.

According to the second aspect of the present invention, in addition to the function of the first aspect of the present invention, the inclined surface of the concave streak provided in the unevenness providing step so as to be continuous with the convex streak is formed on the outer side in the width direction of the blade. Therefore, the angle of the inclined surface can be freely set without being limited by the width of the blade portion. Therefore, the blade edge can be made to protrude from both sides of the outer peripheral edge of the blade portion, and the blade edge angle can be made sharper than before.

According to a third aspect of the present invention, there is provided the method according to the first or second aspect, wherein the unevenness providing step comprises: This is a cutting step in which a large number of cut portions formed of cut grooves or cut holes extending in a direction intersecting with a plurality of cut portions and ridges adjacent thereto are alternately formed.

In the method according to the third aspect of the present invention, the flat metal blank is formed by alternately forming a large number of cut portions as concave portions and convex portions as convex portions, and then bending the blank. In addition, by polishing the outer surface of the curved portion, while separating the blade portion consisting of the ridge between the cut portions,
Since the cutting edges are simultaneously formed on both sides of the outer peripheral edge of these cutting portions, it is not necessary to provide a process for individually forming a cutting edge forming recess for each cutting portion as in the method of the first aspect of the present invention. In addition, there is no need for insert molding, and various labors related to this molding (such as the work of setting individual blade portions to the mold, the work of molding, and the work of repairing the mold) can be omitted. Therefore, the inner blade can be manufactured with a smaller number of man-hours than before. Further, in the method according to the third aspect of the present invention, in the case where the notch has a sloped surface extending from the ridge, and the curved portion is polished from the outer surface until reaching the slope. As in the second invention method, the blade edge is projected from both sides of the outer peripheral edge of the blade portion formed of the ridge, so that the blade edge angle can be made sharper than before. In addition, the curved portion obtained by bending a single plate has no variation in the position of the tip of each blade portion before polishing, or is extremely small, so the thickness that can be polished to obtain the blade edge is In order to solve the third problem, which can ensure a large amount of pressure, the method according to claim 4 which depends on claim 1 or 2, wherein the step of providing the unevenness includes the step of moving the sliding direction on one surface of the metal blank. This is a cutting step of alternately forming a large number of cut grooves extending in the intersecting direction and ridges adjacent thereto.

In the method according to the fourth aspect of the present invention, a flat metal blank is formed by alternately forming a large number of cut grooves as concave ridges and ridges as ridges, and then bending the blank. In addition, by polishing the outer surface of the curved portion, while separating the blade portion consisting of the ridge between the cut grooves,
Since the cutting edges are simultaneously formed on both sides of the outer peripheral edge of these cutting portions, it is not necessary to provide a process for individually forming a cutting edge forming recess for each cutting portion as in the method of the first aspect of the present invention. In addition, there is no need for insert molding, and various labors related to this molding (such as the work of setting individual blade portions to the mold, the work of molding, and the work of repairing the mold) can be omitted. Therefore, the inner blade can be manufactured with a smaller number of man-hours than before. In the method according to the fourth aspect of the present invention, in the case where the cut groove has an inclined surface extending from the ridge, and the curved portion is polished from the outer surface until reaching the inclined surface. As in the second invention method, the blade edge is projected from both sides of the outer peripheral edge of the blade portion formed of the ridge, so that the blade edge angle can be made sharper than before. In addition, the curved portion obtained by bending a single plate has no variation in the position of the tip of each blade portion before polishing, or is extremely small, so the thickness that can be polished to obtain the blade edge is As well as
Until the polishing step, the adjacent blade portions are integrally connected at the groove bottom of the cut groove, and the curved blade portions can be uniformly held without variation in bending, so that the polishing amount can be further reduced. In addition, in the concave / convex imparting step, the ridge is formed at the same time by forming the notch having no cut hole in the blank, so that the notch groove as the concave part and the ridge as the convex part are easily provided. be able to.

[0033] In order to solve the fourth problem, a method according to a fifth aspect of the present invention depends on the invention of the third or fourth aspect, wherein the notch or the notch is formed using a grinding wheel. It is a feature.

The method according to the fifth aspect has the following effect in addition to the effect of the third or fourth aspect.
That is, by processing the cut portion or the cut groove with a grinding wheel, the outer peripheral side surface of the blade portion extending to the polished outer peripheral end surface of each blade portion can be polished and finished.
Therefore, the two surfaces that are continuous with each other that constitute the cutting edge of each blade portion, in other words, the outer peripheral end surface of the blade portion and the outer peripheral side surface of the blade portion both have good finishing accuracy, so that a cutting edge that can improve sharpness is made. Can be.

According to a sixth aspect of the present invention, in order to solve the third problem, in the method according to the sixth aspect, the unevenness providing step comprises forming the metal blank into a corrugated shape. The present invention is characterized in that it is a press working step of alternately forming convex ridges and concave ridges.

In the method according to the sixth aspect of the present invention, a plurality of convex and concave portions are alternately formed on both surfaces by pressing a flat metal blank, and then curved. Further, the outer surface of the curved portion is polished to separate the blade portions formed of the protruding ridges protruding inside the curved portion, and the cutting edges are simultaneously formed on both outer peripheral edges of these blade portions. In the same manner as the invention method, it is not necessary to provide a process for individually forming a cutting edge for each blade portion, and it is not necessary to perform insert molding. Setting work, forming work, forming mold repair work, etc.) can be omitted. Therefore, the inner blade can be manufactured with a smaller number of man-hours than before. Further, in the method according to the sixth aspect of the present invention, the ridge portion and the adjacent ridge portion are connected via the inclined surface by the corrugation, so that the curved portion is formed until reaching the inclined surface. By being polished from the outer surface, similarly to the method of the second aspect of the present invention, the cutting edge can be made to protrude from both sides of the outer peripheral edge of the cutting portion made of the ridge, so that the cutting edge angle can be made sharper than before. In addition, the curved portion obtained by bending a single plate has no variation in the position of the tip of each blade portion before polishing, or is extremely small, so the thickness that can be polished to obtain the blade edge is Up to the polishing step, the adjacent blade portions are connected together until the polishing step, and the bending of each curved blade portion can be uniformly maintained without variation, so that the polishing amount can be further reduced. In addition, as described above, in the concavo-convex applying step, the ridges and the concave ridges can be formed by press working, so that the workability is good, and the outer surface of the curved portion also has a concavo-convex structure until polished. Therefore, the amount of material to be polished in the polishing step is small.

In order to solve the fifth problem, an inner blade according to the invention of claim 7 slides on the inner surface of a curved plate-shaped outer blade having a large number of blade holes, and the inner blade is formed by sliding the inner surface. In the inner blade of a reciprocating cutting hand tool that cuts the thing passed through the hole, the inner blade of the outer blade is formed of a single metal flat plate curved in a direction orthogonal to the sliding direction. A curved portion curved following the curved portion, and a pair of blade plate base portions provided on both sides of the curved portion, wherein the curved portion extends in a direction intersecting the sliding direction and extends along the blade plate. It is characterized in that it has a number of blade portions that are integrally connected to the base portion and both sides of the outer peripheral edge form a blade edge, and a gap provided between the blade portions and communicating between the inside and outside of the curved portion. Is what you do.

According to the seventh aspect of the present invention, since the inner blade is formed of a single metal flat plate, the number of parts is small, the structure can be simplified, and the weight can be reduced. Then, since a single metal flat plate is provided with a number of blade portions and a blade plate base portion integrally connected to both sides of a curved portion provided with a gap therebetween, as in the conventional case, For example, it can be easily manufactured by the method according to any one of claims 1 to 6 without requiring complicated insert molding or the like. Furthermore, since the blade portion does not contact the end surface of the plate thickness so as to be perpendicular to the outer blade, the blade portion is curved according to the curvature of the outer blade and comes into contact with the inner surface of the outer blade, so that it is easily bent. Can be. Thereby, it is possible to easily follow the deformation of the outer blade and to easily generate a cutting sound when cutting a beard or the like with the blade hole of the outer blade.

In order to solve the sixth problem, an inner blade according to an eighth aspect of the present invention is dependent on the seventh aspect, wherein a plurality of notches opened to the inner peripheral edge of each of the blade portions are provided at intervals. It is characterized by having been provided.

According to the eighth aspect of the present invention, in addition to the function of the seventh aspect, the notch of the blade portion allows
When the curved portion is formed in the production of the inner blade, the metal flat plate can be easily bent, and the variation in the bending strength of each blade can be reduced. For this reason, the outer surface of the curved portion can be polished more shallowly and easily, and the blade portion can be well blended and contacted with the inner surface of the outer blade.

According to a ninth aspect of the present invention, there is provided an inner blade according to the ninth aspect, wherein the pair of blade plate base portions are flat plate portions. It is assumed that.

According to the ninth aspect of the present invention, in addition to the operation of the seventh aspect, the pair of blade bases of the curved inner blade plate are used as connecting portions to the inner blade base. Since these are formed of flat plate portions, the outer cutters from the side surfaces of the inner cutter base are not affected by the ridges protruding inside the curved portion of the inner cutter plate. By minimizing the protrusion dimension of the base portion, the width dimension around the inner cutter base can be made compact.

[0043]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 and 2 are a vertical front view and a vertical side view showing the configuration around a cutting head of a reciprocating electric shaver as a reciprocating cutting hand tool.
Reference numeral 1 denotes a main body case, which houses a motor 22, a storage battery, a circuit board on which various electric components are mounted, and the like. A switch knob 23 shown in FIG. 2 is provided on the front (front) of the main body case 21.
The operation of the motor 22 is controlled by performing the OFF operation. Further, the main body case 21 has a top cover 24 screwed to the upper end thereof.

An inner blade driver 25 is accommodated in the space between the cover 24 and the upper end wall of the main body case 21. The driver 25 has thin flexible portions on both sides, and a drive shaft 26 is fitted to a hard portion between the deformed portions. The drive shaft 26 is connected to a rotation shaft 22a of the motor 22, and is eccentrically rotated by the power of the motor 22 with respect to the rotation shaft 22a. With the eccentric rotation of the drive shaft 26, the inner blade driver 25 is reciprocated in the width direction of the main body case 21 with the bending of the flexible deformation portion.

At the center of the hard portion of the inner blade driver 25, an upwardly directed inner blade mounting shaft 27 protruding outside the top cover 24.
An inner blade holder 28 is removably inserted into the shaft 27. 1 and 2 is a rubber seal packing for allowing reciprocation of the inner blade driver 25 and preventing cut shavings from entering the main body case 21.

A frame body 31 is detachably attached to the main body case 21 so as to cover the top cover 24 from the periphery. The frame body 31 is formed of a lower frame 31a that can be attached to and removed from the top cover 24 via a pair of left and right latch release buttons 32, and an upper frame 31b connected to the upper side of the frame 31a. .
In FIG. 1, reference numeral 33 denotes a spring, and the button 32 is pushed in against the spring force, whereby the frame body 31 can be removed.

An outer blade 34 is attached to the upper frame 31b. The illustrated outer cutter 34 has one side portion of a pair of thin metal outer cutter plates 35 having a plurality of blade holes (not shown) and curved in an upwardly convex arch shape. Are fixed to the common edge member 36, and the other side portions are also fixed to the edge member 37 made of synthetic resin. The outer blade 34 is provided with a common edge member 36.
Are hooked on the inner side of the upper frame 31b, and the left and right end edge members 37 are hooked on the concave portions 38 on the inner surface of the upper frame 31b, respectively, and are held in a curved state of being upwardly convex. The edge member 37 is engaged with the recess 38 with play in the vertical direction, so that the outer blade plate 35 is provided so as to be able to move slightly in the vertical direction.

A pair of inner blade support bases 42 having an upwardly directed shaft 41 are mounted on the inner blade holder 28, and on the bases 42, an inner blade base support 43 which can be moved up and down by using the shaft 41 as a guide is assembled. Have been combined. The inner blade support 43 is
It is urged upward by a spring 44 wound around the shaft 41, so that when an inner blade described later is pressed, it can escape to the inner blade base 42 side together with the inner blade. A pivot 45 is integrally protruded from an upper side surface of each inner blade base support 43.

The inner blades 51 are individually supported on the pair of inner blade base supports 43, respectively. Each of the inner blades 51 has an inner blade base 52 made of synthetic resin or light metal, and a one-piece structure formed by processing a hardenable metal thin plate such as stainless steel for a blade as described later and connected to the inner blade base 52. And the inner blade plate 53.

The inner cutter base 52 has a substantially ladder shape, and is mounted by fitting a bearing hole provided at a central portion in the longitudinal direction thereof to the pivot 45. Therefore, the inner blade 51 is supported so as to be able to perform a seesaw movement about the pivot 45 and is provided so as to be able to move in the vertical direction against the force of the spring 44.

The inner blade plate 53 is a piece of metal that is curved in the direction in which it slides on the inner surface of the outer blade 34, in other words, in the direction perpendicular to the width direction of the main body case 21, and that is convex in the shape of an arc. It is formed of a flat plate. Specifically, as shown in FIG. 3 and the like, a curved portion 54 following the inner surface of the outer blade plate 35 and a pair of blade plate base portions 55 provided on both sides of the curved portion 54 are provided.

The curved portion 54 includes a number of blade portions 5 parallel to each other.
6 and a gap 57 provided between the blade portions 56. The gap 57 communicates the inside and the outside of the curved portion 54 and is provided in parallel with the blade portion 56. Many blades 56
Extends in a direction intersecting, for example, at a right angle to the sliding direction, and both ends thereof are integrally connected to the blade plate base portion 55. In the present invention, the blade portion 56 only needs to intersect the sliding direction, and is not necessarily limited to a right angle. A cutting edge 58 is formed on both sides of the outer peripheral edge of each cutting portion 56. In the first embodiment, the cutting edge 58 is formed to project in the direction of the adjacent gap 54.

The cutting edge 58 is formed on the outer peripheral end surface 56 of the blade portion 56.
a (see FIG. 3) and the side surface of the blade portion 56 connected thereto (in the first embodiment, the angle between the outer peripheral end surface 56a, in other words, as shown in FIG. It is formed by a series of inclined surfaces 56b). The cutting edge angle θ may be set to a right angle or less, but in the first embodiment, it is set to a sharp angle of less than 60 degrees, for example, 30 degrees. The outer peripheral end surface 56a and the inclined surface 56b
Are all formed on a polished surface.

As shown in the developed view of FIG. 6A, a plurality of mounting holes 5 are formed on the edge side of the blade plate base 55 on both sides.
9 is open. The inner blade plate 53 has a pair of blade plate bases 55 provided on the inner blade plate 53 in order to maintain a state in which the outer peripheral end surface 56a is bent into an arch shape that is convex upward so as to be exposed. It is fixed to both side surfaces of the inner blade base 52. This connection is performed by crimping a caulking projection integrally provided on the side surface of the inner blade base 52 through the mounting hole 59.

The inner blade 51 supported on the inner blade supporting base 42 as described above is pushed up from below by the spring 44, so that the outer peripheral end surface 56a of the inner blade plate 53 is
5 is pressed against the inner surface. Accordingly, in this reciprocating electric shaver, when the motor 22 is operated to reciprocate the inner blade driver 25 in the left-right direction, the inner blade plate 53 slides on the inner surface of the outer blade plate 35. The beard passing through the blade hole 35 can be cut between the blade portion 56 of the inner blade plate 53 of the inner blade 51 and the blade hole of the outer blade plate 35 to perform shaving.

The shaved debris shaved in this way is filled with gap 5
It falls down through 7. In this case, since the inner blade 51 does not have a structure (conventionally, a central tube and an inner blade base in which the central tube is embedded) continuously extending in the longitudinal direction at the center portion in the width direction, the beard dust is in a ladder shape. Only slightly adheres to the bridge portion 52a (see FIG. 1) of the inner cutter base 52. Therefore, while the beard shavings can be reduced from adhering to the inner blade base 52, the cleaning space for removing the attached beard shavings from the back side of the inner blade base 52 is large, and moreover,
Since the inner blade plate 53 is less likely to hinder the cleaning, it is possible to easily clean the shavings from the back side of the inner blade base 52.

Further, according to the inner blade 51 having the above structure, the outer blade 34
The beard introduced into the blade hole is sharp.

That is, the cutting edge 58 of each blade portion 56 of the inner blade 51 on both sides of the outer peripheral edge is formed by an outer peripheral end surface 56a which is in sliding contact with the inner surface of the outer blade plate 35 and an inclined surface 56b connected to the outer peripheral end surface 56a. It forms an acute angle of 30 degrees. Therefore, the cutting resistance when cutting the beard is small, and the sharpness can be improved. Since the cutting resistance is small as described above, the cut surface of the beard is less likely to be inclined, and the beard can be cut from a direction substantially perpendicular to the axial direction, so that a deep shaving can be performed.

In addition, since the inclined surface 56b is polished together with the outer peripheral end surface 56a and has a high finishing accuracy, the cut whiskers are less likely to adhere to the inclined surface 56b and are quickly discharged. For this reason, sharpness can be improved.

Further, the large number of blade portions 56 of the inner blade plate 53 of the inner blade 51 do not contact the thickness of the inner blade plate 53 with the outer blade plate 35, but follow the curvature of the outer blade plate 35. Since the portion which was one side surface of the curved flat metal plate contacts the inner surface of the outer blade plate 35, it can be easily bent. Thereby, the deformation of the outer blade plate 35 can be easily followed. Therefore, the adaptation state of the blade portion 56 of the inner blade plate 53 to the outer blade plate 35 can always be maintained in an optimum state, and the outer blade plate 3
Since a cutting sound is easily generated when cutting a beard with the blade hole of No. 5, it is easy to obtain a real feeling that the beard or the like is being cut.

Further, since the inner blade 51 is formed only of the two members of the inner blade base 52 and one inner blade plate 53, the number of parts is small, the structure is simple, and as described above. Because it does not have a structure (conventionally a central tube and an inner blade base in which it is embedded) extending continuously in the longitudinal direction at the center in the width direction, it is lightweight. In addition to the light weight, the sharpness is good as described above, so that the driving force for reciprocating the inner blade 51 can be reduced, and the power can be saved accordingly.

The inner blade 51 having the above-described structure is manufactured through a cutting step, a cutting step, a bending step, a polishing step, a quenching step, and an assembling step, which are described below, in this order. Is done.

FIG. 4 is a view for explaining the cutting step. In the figure, reference numeral 61 denotes a stainless steel blank for a cutting tool, which is a rectangular flat plate. In FIG. 4A, reference numeral 62 denotes a part of a grinding wheel provided in a grinding machine (not shown). The grinding whetstone 62 has cut notch ridges 62a which are arranged at regular intervals on the circular circumferential surface thereof and are respectively continuous in the circumferential direction, and grooves 62b located between these ridges 62a.
A grinding wheel of a total shape in which is formed is used.

The grinding wheel 62 is set on a grinding machine and rotated, and grinds the upper surface of the blank 61 fed under the rotation. Thereby, the notch processing is performed on one surface of the blank 61. Due to this processing, a large number of concave and convex ridges extending in the direction in which the inner blade plate 53 intersects the inner surface of the outer blade plate 35 at right angles to the sliding direction during use, in other words, extends in the width direction of the blank 61. And parallel to each other. In the first embodiment, the cuts forming the concave ridges are formed as cut grooves 63 having a shape corresponding to the shape of the cut ridges 62a. The groove 63 is formed by removing a portion of the blank 61 surrounded by a dotted line in FIG. 4B by polishing. Further, the ridges are provided adjacent to the cut grooves 63, and these are formed as ridges 64. FIG. 5 shows the structure of the blank 61 subjected to the uneven processing.

In this notch processing, the notch ridges 62a are flat surfaces 62a as shown in FIG.
1 and the inclined surface 62a2 connected to both sides thereof, the bottom of the cut groove 63 has a groove bottom 63a corresponding to the flat surface 62a1 as shown in FIG.
A slanted surface 56b corresponding to the slanted surface 62a2 is formed on both sides thereof. And the slope 56
“b” is connected to the root of the adjacent ridge 64.

The excision step is performed by the blank 61 shown in FIG.
This is a step of forming the blade plate base 55 and the mounting holes 59 with respect to FIG. This step is performed using a milling machine and a boring machine. That is, a large number of cut grooves 63
And a blank 61 having the ridges 64 are set on a milling machine (not shown), and the left and right sides thereof, that is, FIG.
The area of medium S is cut off by milling in the longitudinal direction. This cutting is performed by the parallel ridges 6 adjacent to the cut groove 63.
4. The mounting holes 59 are provided by setting the blank 61 on a boring machine (not shown) and drilling holes on the left and right sides of the blank 61 at predetermined intervals, respectively. Either of boring and milling may be performed first. FIG. 6 shows a blank 61 formed through such a cutting process.

In the bending step, the blank 61 shown in FIG.
Is attached to a jig (not shown) to hold it in a curved shape, for example, a horseshoe shape. In this step, the blank 61
In the width direction with one side of the cut side positioned inside,
That is, it is bent in a direction perpendicular to the sliding direction. The curved state of the blank 61 is shown in FIG. Note that the mounting hole 59 is used to maintain this curved shape. In other words, the jig has a fixed jig portion having shaft portions on both side surfaces, and a pair of left and right movable jig portions having holes fitted outside the shaft portions. After the fitting hole 59 is fitted to the shaft portion in the state where the portion is open, the movable jig portion is closed, and the longitudinal edges of the blank 61 are sandwiched between the two jig portions, thereby. , The blank 61 is held in a curved shape.

The polishing step is a step of setting the jig in a polishing machine (not shown) and polishing the outer surface of the curved portion 54 of the blank 61. In FIG. 7, Q is a polishing line set at a position deeper than the depth O of the groove bottom of the cut groove 63, in other words, a depth reaching the inclined surface 63b of the cut groove 63, and reaches this position. Curved portion 54 to polishing depth P
Is polished. By this polishing step, the curved portion 5
In FIG. 4, the protruding ridges 64 protruding inward, in other words, the blade portions 56 between the cut grooves 63 are separated in the longitudinal direction of the blank 61, in other words, in the sliding direction. A gap 57 is formed on the outer peripheral edge of the blade portion 56, and a cutting edge 58 is formed on each side of the outer peripheral edge of the blade portion 56.

In the first embodiment, since the cut groove 63 has the inclined surface 56b which forms one surface of the cutting edge 58 as described above, a sharp cutting edge angle θ of about 30 degrees is required. The cutting edge 58 is formed, and the cutting edge 58 is
Each of them is formed by a polished surface, that is, an outer peripheral end surface 56a and an inclined surface 56b. The state of the inner blade plate 53 thus polished is shown in FIG.

Thereafter, a hardening process is performed on the inner blade plate 53 by a hardening process to increase the hardness of the inner blade plate 53.

The last assembling step is a step of attaching the blank 61, which has been polished and quenched as described above, to the inner blade base 52 while maintaining a curved state. The fixing of the blank 61 to the inner cutter base 52 is performed by fitting the mounting hole 59 into the caulking protrusion integrally provided on the side surface of the inner cutter base 52 as described above, and then caulking the protrusion. Is done. The inner blade 51 is manufactured by the above procedure.

According to the method of manufacturing the inner blade 51 as described above,
The inner blade plate 53 has a flat metal blank 61 formed with a number of cut grooves 63 and ridges 64 adjacent thereto.
Is provided and then curved, and then the outer surface of the curved portion 54 is polished to a polishing line Q reaching the inclined surface 56b at a depth equal to or greater than the thickness of the groove bottom of the cut groove 63, thereby adjoining the cut groove 63. It is manufactured by separating the ridges 64 as blade portions 56 and forming cutting edges 58 on both outer peripheral edges of these blade portions 56.

For this reason, a large number of blades 56 and their blades 5
8 and the gap 57 can be formed at one time, and it is not necessary to provide a process for individually providing a cutting edge forming recess for each blade portion 56, and it is not necessary to perform insert molding. (E.g., the work of setting individual blade portions to the molding die, the molding operation, the repairing operation of the molding die, etc.). Therefore, the inner blade plate 53 and, consequently, the inner blade 51 can be manufactured with a smaller number of man-hours than before.

In addition, the bent portion 54 obtained by bending the blank 61 made of a single flat plate in the bending step has no variation in the position of the leading end of each blade portion 56 before polishing. Since it is extremely small, the polishing depth for obtaining the cutting edge 58 can be reduced. That is, the range in which the cutting edge angle θ is 30 degrees is described as an example in the case where the cutting edge angle θ of the blade portion 56 is 30 degrees.
Is larger than the polishing processing range M when the conventional cutting edge angle α shown in FIG. 23A is 60 degrees, that is, 0.127 mm. In other words, there is a large margin for the polished working dimensions, and the polishing accuracy may be low accordingly, so that the polishing operation can be easily performed.

Further, since the cut portion is formed by the cut groove 63, the processing for providing the groove 63 can be easily performed by polishing using a milling machine or the like. In addition, at the time of polishing the outer surface of the curved portion 54, the scheduled portion of the adjacent blade portion 56 at the groove bottom of the cut groove 63, that is, the ridges 64 are connected together, so that in the bending process, The bending of the curved blade portions 56 can be uniformly maintained without variation.

When the cut portion has a cut hole as in a third embodiment to be described later, in addition to the processing for cutting the groove, a hole (a cut hole previously forming the gap 57) is formed in the center of the groove. ) Is required, which takes time and effort in the processing, and since the respective blade portions are already separated by the gaps 57 at the time of the bending process, the bending adjustment of the curved blade portions 56 varies. There is fear. Therefore, by eliminating such a problem, the amount of polishing on the outer surface of the curved portion 54 can be further reduced.

Further, in the cutting step, the inclined surface 56b connected to the ridge 64 serving as the blade portion 56 is provided in the cutting groove 63, and the inclined surface 56b is positioned outside the blade portion 56 in the width direction. In providing 63, the angle of the inclined surface 56b can be set freely without being restricted by the width of the blade portion 56. Therefore, the cutting edge 58 can be provided so as to protrude from both sides of the outer peripheral edge of the cutting portion 56, and the cutting edge angle θ can be made sharper than before. Therefore, sharpness can be improved.

Further, since the cut groove 63 is machined by the grinding wheel 62, two surfaces constituting the cutting edge 58 of each blade portion 56, that is, the outer peripheral end face 5 of the blade portion 56, are continuous with each other.
6a and the inclined surface 56b which forms the outer peripheral side surface of the blade portion 56 are both polished, and the finishing accuracy is good. Therefore, it is possible to reduce the likelihood of the shavings and the like being caught and attached to the inclined surface 56b and the like, so that the sharpness can be improved.

FIGS. 8 to 14 show a second embodiment of the present invention. Since the second embodiment has basically the same configuration as the first embodiment, the same components are denoted by the same reference numerals as the first embodiment, and the configuration and The description of the operation will be omitted, and different portions will be described below. The second embodiment is different from the first embodiment in that a notch is provided in the blade portion 56, a cutting step, and the manufacturing efficiency is improved.

That is, in the second embodiment, a plurality of notches 71 are provided at intervals in the blade portion 56 as shown in FIGS.
6 are open to the inner periphery. These notches 7
1 is formed by cutting a part of the ridge 64 by milling at intervals in a cutting step of forming the plate base portion 55 from the blank 61 in which the cut groove 63 has been machined.

The configuration other than the above is the same as that of the first embodiment, including the parts not shown, and therefore, the inner blade of the reciprocating electric shaver according to the second embodiment is described. Also in the method for manufacturing the same, the same effects as in the first embodiment can be obtained, and the first to fifth and seventh problems of the present invention can be solved.

Further, since the notch 71 is provided in the blade portion 56 as described above, the blank 61 can be easily bent when the curved portion 54 is formed in the manufacture of the inner blade 51, and the blade portion 56 Variation in bending adjustment can be reduced. Therefore, it is excellent in that the outer surface of the curved portion 54 can be polished more shallowly and easily.
6 is more easily bent and comes into contact with the inner surface of the outer blade plate 35 with good fit, so that it is excellent in that the sharpness can be further improved.

Further, in the second embodiment, the inner blade plate 53 is not obtained by processing each blank one by one, but as shown in FIGS. The material plate 161 corresponding to the above is processed to obtain a plurality of inner blade plates 53 at the same time, thereby improving manufacturing efficiency.

That is, FIG. 10 shows a stainless steel material plate 161 processed in the cutting step.
For example, the size is equivalent to six blanks. In the cutting step, the upper surface of the material plate 161 is polished by a mold grinding wheel while leaving the fixed edges 162 at both ends in the longitudinal direction.

FIG. 11 shows a number of parallel cut grooves 6.
3 shows the material plate 161 obtained by processing the material plate 161 in which the ridges 3 and the ridges 64 are processed alternately in a cutting step. In this cutting step, the processing of forming the blade plate base portion 55 is performed using a milling machine and a boring machine. That is, the material plate 161 having the cut grooves 63 is set on a milling machine (not shown), and portions corresponding to the plurality of sets of the blade plate base plates 55 and portions corresponding to the notches 71 are simultaneously cut along the longitudinal direction by milling. I do. In this processing, the setting of the material plate 161 on the milling machine is performed using the fixed edge 162 thereof. FIG. 11 shows the material plate 161 thus processed. In FIG. 11A, reference numeral 71a denotes a notch cut into the fixed edge 162. Of course, in the cutting step, a boring process for providing the mounting holes 59 is next performed on the material plate 161 shown in FIG.

Further, in the cutting step, the material plate 161 shown in FIG.
(A) Cut off at the boundary indicated by the dashed line. Thereby, six blanks 61 are obtained as shown in FIG. Details of these blanks 61 are shown in FIG. 12, which are the same as those described in FIG. 6 in the first embodiment.

After that, the inner blade plate 53 is manufactured through the bending step, the polishing step, the quenching step, and the assembling step in this order.

As described above, the inner blade plate 53 is moved with respect to the material plate 161 having a size from which a plurality of inner blade plates 53 can be obtained.
After providing the unevenness corresponding to each of the plurality of inner blade plates 53 by cutting and cutting, the material plate 161 is cut into a predetermined size, so that the plurality of inner blade plates 53 can be manufactured at the same time. There is an advantage that the mass productivity can be improved and the manufacturing cost can be reduced.

The concept of simultaneously manufacturing a plurality of inner blade plates 53 shown in the second embodiment is based on the first embodiment.
Of the inner blade plate 53 (which has no notch in the blade portion 56) shown in the embodiment of the present invention, and the third and later-described third and fourth embodiments.
It can be applied to the manufacture of the inner blade according to the fourth embodiment.

FIGS. 15 and 16 show a third embodiment of the present invention. Since the third embodiment has basically the same configuration as that of the second embodiment, the same components are denoted by the same reference numerals as those of the second embodiment.
The description of the configuration and operation is omitted, and different portions will be described below. The difference between the third embodiment and the second embodiment is the configuration of the cut portion formed in the blank 61.

That is, in the third embodiment, the cut portion 163 as a concave strip has a slot-shaped cut hole 164. This notch 163
Is formed in the width direction of the blank with a form-grinding grindstone. First, a notch is cut into a groove, and then a slotted hole 164 is formed in the groove bottom of the notch 163 by using a grindstone or milling cutter for slotting. It is formed.

The configuration other than the above is the same as that of the second embodiment, including the parts not shown, and therefore, the inner blade of the reciprocating electric shaver according to the third embodiment is described. Also in the manufacturing method thereof, the first to fifth and seventh problems of the present invention can be solved in the same manner as in the second embodiment.

FIGS. 17 to 20 show a fourth embodiment of the present invention. Since the fourth embodiment has basically the same configuration as the first embodiment, the same components are denoted by the same reference numerals as in the first embodiment, and the configuration and The description of the operation will be omitted, and different portions will be described below. The differences of the fourth embodiment from the first embodiment are the step of providing unevenness to the blank and the ridges and valleys formed by the step.

That is, in the fourth embodiment, the step of providing unevenness to the stainless steel blank 61 for a cutting tool made of a rectangular flat plate is performed by a press working step. In this press working process, the blank 6
The central portion excluding both end portions in the width direction of 1 is pressed by a press equipped with a press die having a corrugated forming surface so as to mesh with each other.

As shown in FIG. 19, on the both surfaces of the central portion, a large number of concave portions 63 and convex portions 64 extending in the width direction of the blank 61 are alternately formed. Is shaped into a wave shape. As described above, in the unevenness providing step, the convex ridges 64 and the concave ridges 63 are formed by pressing.
Can be formed, so that its workability is good.

Then, the adjacent ridges 63 and ridges 64
And are integrally connected via an inclined surface 56b (see FIG. 20A). The angle of the inclined surface 56b, that is, the angle θ of the cutting edge 58 formed by the polished outer peripheral end surface 56a and the inclined surface 56b can be set to an arbitrary angle of less than 60 °, but in the fourth embodiment, FIG. The angle is 45 ° as shown in FIG.

[0098] The both side portions in the width direction, on which the press working is not performed, are flat plate portions and form a blade plate base portion 55 connected to both side surfaces of the inner blade base 52. Each of the blade plate base portions 55 has a mounting hole 59 (FIG. 1).
9 (A)). These mounting holes 59 are provided in the blade plate base portion 55 by punching by the press machine in the press working step. The mounting hole 59 for connecting the inner blade plate 53 made of the pressed blank 61 to the inner blade base 52 at the same time as the concavo-convex processing for the metal blank 61 is performed.
By machining, it is possible to improve the workability of machining the inner blade plate 53 and reduce the cost.

The bending process, the polishing process, the quenching process, the assembling process, and the like in the other configurations and the inner blade manufacturing method are the same as those in the first embodiment, including the portions not shown. Therefore, in the inner blade of the reciprocating electric shaver according to the fourth embodiment and the method of manufacturing the same, the same operation as in the first embodiment is obtained, and the first to fourth and fourth aspects of the present invention are obtained. And the seventh problem can be solved.

In addition, the convex ridge 64 formed by the press working and having a corrugated shape and the concave ridge 63 adjacent thereto are connected via the inclined surface 56b, and the blank 61 bent by the bending process is formed. In the polishing step, the curved portion 54 is polished from the outer surface until the curved portion 54 reaches the inclined surface 56b, so that the cutting edge 58 is formed on the outer peripheral edge of the blade portion 56 including the protruding ridge portion 64 protruding inside the curved portion 54. By protruding to both sides, the cutting edge angle θ can be made sharper than before. Also, since the waveform formed on the blank 61 by the press working is formed on both surfaces of the blank 61, in the bending step, the bending may be performed with one of the faces of the blank 61 inside. There is no need to consider the directionality, and handling is easy.

In addition, the bending portion 5 obtained by bending one plate
In No. 4, there is no variation in the position of the tip of each blade portion 56 before polishing, or even if it is very small, a large polished thickness for obtaining the blade tip 58 can be secured. By the way,
When the cutting edge angle θ is 45 degrees as in the fourth embodiment, the dimension range indicated by J in FIG.
Since m) is a thickness that can be polished, the polishing operation can be easily performed.

Further, until the polishing step, the protruding ridges 64 (projecting to the inside of the curved portion 54) serving as the blade portions 56 are connected integrally, and the bending degree of each curved blade portion 56 is varied. The polishing amount can be maintained evenly, so that the polishing amount can be further reduced. In addition, the curved portion 5 is not polished until it is polished.
Since the outer surface of No. 4 also has an uneven structure, the amount of material to be polished in the polishing step for the outer surface can be reduced. Therefore, the polishing operation can be performed more easily.

The present invention is not limited to the above embodiments. For example, in the case where the cut hole 164 is provided as in the third embodiment, the cut hole 164 is processed with a grinding wheel so that the cut hole 164 also serves as the gap 57, that is, the cut hole 164 also serves as the concave strip. Is formed at right angles between the polished side surface of the blade and the polished outer peripheral end surface 56a of the blade portion 56, and this blade edge 58 is
6 can be formed on both sides of the outer peripheral edge.

[0104]

The present invention is embodied in the form described above and has the following effects.

According to the first and third aspects of the present invention,
Since the inner blade can be manufactured with a smaller number of man-hours than before, and the range of polished thickness for forming the blade edge is large, it can be manufactured easily and at low cost.

According to the second aspect of the invention, which is dependent on the first aspect, in addition to the effects of the first aspect, a cutting edge is provided so as to protrude from both sides of the outer peripheral edge of the cutting portion. The angle can be made smaller than before.

According to the method of the present invention described in claim 1 or 2, the inner blade can be manufactured with a smaller number of man-hours than the conventional method, and the cutting edge can be formed. Since the thickness range that can be polished is large, in addition to being able to be manufactured easily and inexpensively, not only is the notch processing for the blank simple, but also the polishing depth to be applied to the outer surface of the curved portion to make the cutting edge is more. Since the depth can be reduced, the productivity can be further improved.

According to the fifth aspect of the invention, which is dependent on the third or fourth aspect, in addition to the effects of the third or fourth aspect, two mutually continuous surfaces forming the cutting edge of each blade portion are provided. Are polished, so that a sharp cutting edge can be formed.

According to the sixth aspect of the invention, which is dependent on the first aspect, the inner blade can be manufactured with less man-hours than in the conventional method, and the polishing for forming the cutting edge can be performed in the same manner as in the first aspect of the invention. Since the possible thickness range is large, in addition to being able to be manufactured easily and inexpensively, it is possible not only to easily carry out embossing on the metal blank by pressing, but also to apply it to the outer surface of the curved portion to make a cutting edge. Since the polishing depth can be made shallower, manufacturability can be further improved.

According to the inner cutter according to the seventh aspect of the present invention, the manufacture is easy because complicated insert molding is not required unlike the related art, and the component is formed by a single metal flat plate. Since the number of points is small, the structure is simple and lightweight,
Moreover, since the blade portion curved following the curvature of the outer blade can be easily bent, the familiarity with the outer blade is good, and
When used, a cutting sound is easily generated, and a good feeling of use can be given.

According to the inner blade according to the eighth aspect, which is dependent on the seventh aspect, in addition to the effect of the seventh aspect,
In its manufacture, the work of bending a metal flat plate can be facilitated, and the variation in bending adjustment of each blade portion is small and the contact with the inner surface of the outer blade can be improved, so that a reciprocating cutting hand tool of higher quality can be obtained. Can provide an inner blade.

According to the inner blade according to the ninth aspect of the invention, which is dependent on the seventh aspect, in addition to the effect of the seventh aspect,
The size of the outer blade base projecting from the side surface of the inner cutter base is minimized, and the width around the inner cutter base is made compact, without being affected by the ridges protruding inside the curved part of the inner cutter base. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a configuration around a cutting head of a reciprocating electric shaver having an inner blade according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view showing a configuration around a cutting head shown in FIG. 1;

FIG. 3A is a longitudinal sectional front view showing a configuration of a part of an inner blade plate provided in the inner blade according to the first embodiment. (B) is FIG.
(A) The longitudinal section side view shown along the ZZ line.

FIG. 4A is a cross-sectional view showing a relationship between a blank forming an inner blade plate of the inner cutter according to the first embodiment and a part of a grinding wheel for processing a cutting groove in the blank. (B) is sectional drawing of the blank which shows the cutting scheduled part of a grinding wheel.

FIG. 5A is a plan view showing a blank forming an inner blade plate of the inner blade according to the first embodiment in a state where cut grooves are formed. (B) is a front view of the blank shown in FIG. 5 (A). FIG. 5C is a side view of the blank shown in FIG.

FIG. 6A is a plan view showing a blank forming an inner blade plate of the inner blade according to the first embodiment in a state where a blade plate base portion and the like are formed. FIG. 7B is a front view of the blank shown in FIG. FIG. 7C is a side view of the blank shown in FIG.

FIG. 7A is a vertical sectional front view showing a part of a blank constituting an inner blade plate of the inner blade according to the first embodiment in a bent state. FIG. 7B is a longitudinal sectional view taken along line YY in FIG.

FIG. 8 is a vertical sectional side view showing a configuration around a cutting head of a reciprocating electric shaver having an inner blade according to a second embodiment of the present invention.

FIG. 9A is a longitudinal sectional front view showing a configuration of a part of an inner blade plate provided in an inner blade according to a second embodiment. (B) is FIG.
(A) The longitudinal section side view shown along the XX line.

FIG. 10A is a plan view showing a material plate for forming a plurality of inner blade plates of the inner blade according to the second embodiment in a state where cut grooves are formed. (B) is a front view of the material plate shown in FIG. 10 (A). FIG. 11C is a side view of the material plate shown in FIG.

FIG. 11A is a plan view showing a material plate for forming a plurality of inner blade plates of the inner blade according to the second embodiment in a state where a blade plate base portion and the like are formed. (B) is a front view of the material plate shown in FIG. 11 (A). FIG. 12C is a side view of the material plate shown in FIG.

FIG. 12 is a plan view showing a state in which the material plate of the inner blade according to the second embodiment is separated into a plurality of blanks.

FIG. 13A is an enlarged plan view showing a configuration of a blank forming an inner blade plate of an inner blade according to a second embodiment, which is obtained by separating in FIG. 12; FIG. 12B is a front view of the blank shown in FIG. FIG. 12C is a side view of the blank shown in FIG.

FIG. 14A is a longitudinal sectional front view showing a part of the configuration of a blank forming an inner blade plate of an inner blade according to a second embodiment in a state where it is bent. 14B is a longitudinal sectional view taken along line WW in FIG.

FIG. 15A is a longitudinal sectional front view showing a part of the configuration of a blank forming an inner blade plate of an inner blade according to a third embodiment of the present invention in a bent state. (B) is V- in FIG.
FIG. 5 is a longitudinal sectional view taken along line V.

FIG. 16 is a plan view showing a blank forming an inner blade plate of the inner blade according to the third embodiment in a state where a blade plate base portion and the like are formed.

FIG. 17A is a longitudinal sectional front view showing a configuration around a cutting head of a reciprocating electric shaver having an inner blade according to a fourth embodiment of the present invention. FIG. 18B is a longitudinal sectional side view showing a configuration around the cutting head shown in FIG.

FIG. 18A is a longitudinal sectional front view showing a configuration of a part of an inner blade plate provided in an inner blade according to a fourth embodiment. (B) is FIG.
FIG. 8 (A) is a longitudinal sectional side view taken along the line U-U.

FIG. 19A is a plan view showing a blank forming an inner blade plate of an inner blade according to a fourth embodiment in a state in which press working has been performed; FIG. 20B is a cross-sectional view taken along the line EE in FIG. FIG. 20C is a cross-sectional view taken along line FF in FIG.

FIG. 20A is a longitudinal sectional front view showing a part of the configuration of a blank forming an inner blade plate of an inner blade according to a fourth embodiment in a bent state. FIG. 20B is a longitudinal sectional view taken along line GG in FIG.

FIG. 21A is a longitudinal sectional front view showing a configuration around a cutting head of a reciprocating electric shaver having an inner blade according to a conventional example. (B) is a longitudinal sectional side view showing the configuration around the cutting head shown in FIG. 21 (A).

FIG. 22A is a longitudinal sectional front view showing a configuration of a part of an inner blade according to a conventional example. FIG. 22B is a longitudinal sectional view taken along the line HH in FIG.

FIG. 23 (A) is a longitudinal sectional front view showing a partial configuration of an inner blade according to a conventional example before polishing. (B) shows FIG.
(A) The longitudinal cross-sectional view shown along the II line.

FIG. 24A is a longitudinal sectional front view showing a state in which the height of an inner blade plate is not uniform in an inner blade according to a conventional example before polishing. FIG. 25 (B) is a longitudinal sectional front view showing a state after polishing of the inner blade shown in FIG. 24 (A).

[Explanation of symbols]

 Reference numeral 34: outer blade, 35: outer blade plate, 51: inner blade, 52: inner blade base, 53: inner blade plate, 54: curved portion, 55: blade plate base portion, 56: blade portion, 56a: blade portion Outer peripheral end face, 56b: Slope of blade (slope of groove), 57: Gap, 58: Blade, θ: Angle of blade, 61: Blank, 62: Grinding stone, 63: Groove (groove) Part, notch part), 64: ridge (projection part) 71: notch, 163: notch part, 164: notch hole (notch part) Q: polishing line, O: depth of groove bottom of notch groove. 63: concave streak, 64: convex streak.

Claims (9)

[Claims] An inner blade base and an inner blade plate connected to the inner blade base, wherein the blade hole slides on an inner surface of a curved outer blade having a plurality of blade holes. A method for manufacturing an inner blade of a reciprocating cutting hand tool that cuts a workpiece passed through a plurality of ridges extending in a direction intersecting the sliding direction on at least one surface of a flat metal blank. And a concave / convex forming step of alternately forming concave and ridge portions adjacent thereto, a bending step of bending the blank in a direction perpendicular to the sliding direction with the one surface positioned inside, and a bending of the blank. A polishing step of polishing the outer surface to separate the blade portions made of the protruding ridges protruding inside the curved portion from each other, and forming a cutting edge on each of both outer peripheral edges of these blade portions, The inner blade plate made of a blank in a direction orthogonal to the sliding direction And an assembling step of bending and attaching to the inner cutter base. 2. The method according to claim 1, wherein the step of forming the concave and convex portions comprises forming an inclined surface extending from the convex ridge portion to make both sides of the outer peripheral edge of the blade portion acute angles in the concave ridge portion. The method for manufacturing an inner blade of a reciprocating cutting tool according to claim 1, wherein the polishing is performed to a depth reaching the inclined surface. 3. The method according to claim 1, wherein the step of providing the unevenness includes the step of forming, on one surface of the metal blank, a plurality of cuts formed by cut grooves or cut holes extending in a direction intersecting the sliding direction, and ridges adjacent thereto. 3. The method for manufacturing an inner blade of a reciprocating cutting hand tool according to claim 1, wherein the cutting step includes alternately forming a cutting step. 4. A step of forming a plurality of notches extending in a direction intersecting with the sliding direction on one surface of the metal blank, and forming a plurality of notches adjacent to the notches alternately on the one surface of the metal blank. 3. The method according to claim 1, wherein
3. The method for manufacturing an inner blade of a reciprocating cutting tool according to item 1. 5. The method for manufacturing an inner blade of a reciprocating cutting tool according to claim 3, wherein the notch or the notch is formed using a grinding wheel. 6. The method according to claim 1, wherein the step of providing irregularities is a step of forming the metal blank into a corrugated shape to alternately form the convex ridges and the concave ridges. Or the method for manufacturing an inner blade of a reciprocating cutting hand tool according to 2. 7. An inner blade base, and an inner blade plate connected to the inner blade base, and slides on an inner surface of a curved outer blade having a plurality of blade holes to slide the blade hole. In the inner blade of a reciprocating cutting hand tool that cuts the thing passed through, the inner blade plate is formed of a single metal flat plate curved in a direction orthogonal to the sliding direction, A curved portion curved in accordance with the inner surface of the outer blade, and a pair of blade plate base portions provided on both sides of the curved portion and connected to the inner blade base, wherein the curved portion includes the sliding member; A number of blade portions extending in a direction intersecting the direction of movement and integrally connected to the blade plate base portion, and both outer peripheral edges forming a cutting edge, and provided between these blade portions to allow the inside and outside of the curved portion to be provided. An inner blade for a reciprocating cutting hand tool having a gap communicating therewith. 8. An inner blade for a reciprocating cutting hand tool according to claim 7, wherein a plurality of notches opened at the inner peripheral edge are provided at intervals in each of said blade portions. 9. The reciprocating cutting hand tool according to claim 7, wherein said pair of blade plate base portions are flat plate portions.