JP2005168631A - Reciprocating electric razor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reciprocating electric razor in which friction force between a screen and an cutter is reduced comparing to a cutter whose whole sliding and contacting range with an screen is net, driving force of the cutter is reduced to reduce consumption power of a cell, the cutter which can be made by pressing a metal sheet to enhance processing precision and durability of molds, and manufacturing yield is enhanced to reduce manufacturing cost. <P>SOLUTION: In the reciprocating electric razor having the screen 24 and the inner blade 10 comprising metal sheets respectively bent in an arch shape and respectively having a large number of openings formed therein and reciprocating the cutter 10 relative to the screen 24 while sliding and contacting the cutter 10 to the inner surface of the screen 24, the inner blade 10 has coarse ribs 18 forming a large number of coarse openings lining in a reciprocating direction and a network region 20 comprising a large number of fine openings within the sliding and contacting range with the screen 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  According to the present invention, an inner blade having a large number of openings formed in a metal plate curved in the same manner is slidably contacted with an inner surface of an outer blade having a large number of openings formed in a metal plate curved in an arch shape. The present invention relates to a reciprocating electric shaver that cuts a ridge introduced from the opening of the outer blade by the opening of the inner blade.

  In this type of reciprocating electric razor, when the inner blade is formed of a metal plate curved in an arch shape, there have conventionally been a number of openings formed by processing the metal plate into a net shape.

JP-B 57-30018 JP 08-17857

  Patent Document 1 discloses an inner blade that is formed into a net shape by electroforming, except for the outer periphery of a thin metal plate, is curved in an arch shape, and holds both ends on a base. That is, by providing a large number of orthogonal ribs (rim blades) orthogonal to the reciprocating direction of the inner blades and a large number of inclined ribs that are located on parallel straight lines that are inclined with respect to these orthogonal ribs and connect the orthogonal ribs to each other, The entire metal plate of the blade is a mesh.

  In Patent Document 2, a rectangular or parallelogram opening (whisker introduction hole) is formed in one of the outer blade and the inner blade, and a diagonal line substantially parallel to two opposite sides of the rectangle or parallelogram is formed on the other. One having a rectangular or parallelogram opening is shown. Therefore, in this case as well, the inner blade is a net-like one as a whole.

In the inner blades disclosed in Patent Documents 1 and 2, since the mesh is formed over the entire surface in the range of sliding contact with the inner surface of the outer blade, the contact area between the outer blade and the inner blade increases. On the other hand, in order to improve the sharpness and prevent the wrinkle from being pulled between the outer blade and the inner blade, the pressing force (unit: g / cm ² ) of the inner blade against the outer blade needs to be a certain level or more. . Therefore, when the contact area increases, the pressing force P (unit: g, for example) increases, and the frictional force F = μP (where μ is a frictional resistance coefficient) of the inner blade increases. When the frictional force is increased in this way, the driving force of the inner blade is also increased, and the battery is consumed quickly.

  Moreover, since the mesh-shaped inner blade is generally fine in mesh, it is difficult to process the mesh with high accuracy on the entire inner blade. Thus, it has been proposed to manufacture such an inner blade by electroforming or etching (see Patent Document 1). In electroforming, a conductive film having a mesh pattern is formed on an insulating substrate, an electrodeposition metal is electrodeposited on the conductive film, and then the substrate is peeled off. However, it is difficult to increase the thickness of the inner cutter made by these electroforming and etching methods, and since it is thin, there is a problem that the rigidity is insufficient and the sharpness is deteriorated or the durability is lowered. In addition, the manufacturing cost increases.

  Therefore, it is conceivable to make an inner blade by punching a thin metal plate with a press. However, in order to punch a fine opening on the entire surface of the inner blade, it is necessary to make the precision of the press die very high. In addition, it is very difficult to process a large area with high precision because it is inevitable to thermally deform the mold in use, which reduces the durability of the mold, lowers the product yield, and increases manufacturing costs. It was a big cause of.

This invention is made | formed in view of such a situation, and aims at achieving the following matters.
(A) Compared to an inner blade whose meshing range is in contact with the outer blade, the frictional force between the outer blade and the inner blade is reduced, the driving force of the inner blade is reduced, and the power consumption of the battery is reduced.
(B) It is possible to make an inner blade by pressing a metal plate. In this case, the processing accuracy and the durability of the mold are improved, the product yield is improved, and the manufacturing cost can be reduced.

  According to the present invention, these objects include an outer blade and an inner blade made of a metal plate each curved in an arch shape and formed with a plurality of openings, and the inner blade is brought into sliding contact with the inner surface of the outer blade. In the reciprocating electric razor that reciprocates while moving, the inner blade has a large number of fine ribs that form a large number of coarse openings aligned in the reciprocating direction within a sliding contact range with the outer blade. It is achieved by a reciprocating electric shaver characterized by having a mesh-like region consisting of openings.

  That is, by providing a large number of coarse ribs and a mesh area, the area of the mesh area that is in sliding contact with the outer blade is reduced, and the contact area of the inner blade with respect to the outer blade is reduced without roughening the entire inner blade. It is possible to reduce the force and manufacture by press working. In this case, the durability and yield of the mold can be improved, and the manufacturing cost can be reduced.

(A) Since the inner blade does not make the entire surface of the sliding contact area with the outer blade a fine mesh, but a combination of coarse ribs and a mesh region, the contact area of the inner blade is reduced and the frictional force is reduced. be able to. Therefore, it is possible to reduce the driving force of the electric motor that drives the inner blade, to reduce the size of the motor, to reduce power consumption, and to reduce battery consumption.
(B) Since the fine mesh area is only a part of the inner blade, the area is narrowed. For this reason, when manufacturing by press punching, the area of the part corresponding to the network area | region of a metal mold | die becomes small, the process precision improves, durability of a metal mold | die improves, and a manufacture yield improves. Therefore, the manufacturing cost can be reduced.

  The coarse ribs may be parallel ribs whose intervals are constant and parallel, but the intervals may vary. The coarse rib may be an orthogonal rib that is substantially orthogonal to the reciprocating direction of the inner blade. The fine openings in the mesh area are preferably polygonal, but may be circular. The mesh region can be at least part of the circumferential direction of the inner blade and the coarse rib can be connected to the reciprocating direction of the inner blade. In this case, the mesh region is located near the center of the inner blade in the circumferential direction (ridge line). In the vicinity), a set of opening groups in which coarse ribs and orthogonal ribs are arranged so as to be connected in the reciprocating direction can be obtained. The mesh region may be formed by two sets of aperture groups (mesh consisting of a large number of apertures) arranged so as to connect orthogonal ribs in the reciprocating direction on both sides sandwiching the vicinity of the center in the circumferential direction of the inner blade. The mesh area may be formed by a group of openings (mesh consisting of a large number of openings) that gathers in the vicinity of the center of the inner blade in the circumferential direction and in the vicinity of the center of the width in the reciprocating direction (in an island shape).

  If the opening in the mesh area is a polygon having at least three sides that are non-parallel to the reciprocating direction of the inner blade, the type of crossing angle formed by the opening of the outer blade when the inner blade cuts the rivet Increases and sharpness improves. For example, a hexagon is optimal as such a polygon.

  Further, the openings in the mesh area may be circular or oval instead of polygons. In this case, the circles and ellipses may be arranged in a line in the reciprocating direction of the inner blade, but they may also be arranged in a zigzag pattern in a zigzag manner. Suitable for improving sharpness.

  Since the inner blade is formed by a combination of coarse ribs and a mesh area, the area of the fine mesh area is reduced. For this reason, when the inner blade is made by plastic working such as press punching, it is possible to increase the accuracy of the die region corresponding to the mesh region and increase its durability. In this case, the sharpness can be remarkably improved by machining a blade having a rake angle of 90 ° or less on the edge of the opening on the blade surface side.

  Such rake angle processing is performed by, for example, performing blanking with a press machine so that the orthogonal ribs and the ribs in the mesh area are slightly wider than the final shape, and then slightly wider than the punching width and the leading edge. Is subjected to plastic working (for example, cold forging) using a die chamfered with an inclined surface, and finally, the lower surface of the metal plate (the surface on the bottom side of the die-processed hole or groove) is surface ground. Thus, the rake angle can be processed to 90 ° or less by forming the ribs and mesh openings. In addition, press punching is omitted, and the top edge of the convex part corresponding to the opening shape of the inner blade is pressed (cold forging) with a chamfered mold from the beginning, and then the lower surface of the metal plate is surface ground May be.

  When the inner blade is made by press working, the rake angle can be processed as described above, but the rake angle can also be added by other methods such as etching. The inner blade can also be made by a method other than press working such as electroforming or etching, and the present invention includes those made in this way.

  1 is an exploded view of an inner blade 10 according to an embodiment of the present invention, FIG. 2 is a plan view of the inner blade plate 12, and FIG. 3 is a sectional view taken along line III-III.

  1A shows a developed state of the inner blade plate 12, FIG. 1B shows an arched state, and FIG. 1C shows a holding base 14 for holding the inner blade plate 12. FIG. In FIG. 1, the inner blade plate 12 can be made by subjecting a quenchable stainless steel plate to plastic working such as press working, and applying heat treatment such as quenching or annealing at an appropriate time.

  The inner blade plate 12 is long in the reciprocating motion direction a connecting the outer rib portion 16, the orthogonal ribs 18 serving as a number of mesh ribs orthogonal to the reciprocating motion direction a of the inner blade 10, and the orthogonal ribs 18 near the center thereof. And a mesh region 20.

  The mesh region 20 is formed by a group of openings in which hexagonal openings are arranged in a line in the reciprocating direction a. The orthogonal ribs 18 are arranged in parallel in the reciprocating direction at regular intervals, and one hexagon of the mesh region 20 has the same width between two opposite sides (width of two surfaces) as the interval between the orthogonal ribs 18. . For this reason, adjacent hexagons are aligned in the reciprocating direction with two opposite sides overlapping, and two opposite vertices of the hexagon are connected to the orthogonal ribs 18. As a result, the orthogonal ribs 18 are reinforced by being connected by a hexagonal pattern.

  Both ends of the orthogonal rib 18 are connected to a portion 16 a parallel to the reciprocating direction a of the outer frame portion 16. A bifurcated claw 22 projects from the center of a portion 16a of the outer frame portion 16 parallel to the reciprocating direction a. These claws 22 are fixed to the holding base 14 in a state where the inner blade plate 12 is curved in an arch shape (see FIG. 1B). That is, the claw 22 engages with a convex portion 14a (see (C) in the figure) provided on the side surface of the holding base 14.

  The holding table 14 engages with a vibrating body (not shown) that is reciprocally driven by a motor, and reciprocates integrally with the inner blade plate 12. The inner blade 10 is elastically pressed against the outer blade 24 by a spring (not shown), and the inner blade plate 12 slides in contact with the inner surface of the outer blade 24 shown in FIG. 3 and reciprocates. The outer blade 24 is made of a thin metal plate curved in an arch shape and has a large number of openings.

  According to this embodiment, the scissors entering from the opening of the outer blade 24 enter the opening of the inner blade plate 12 and are cut by the reciprocating motion of the inner blade 10. Here, at the center in the circumferential direction of the inner blade plate 12 curved in an arch shape, that is, in the center in the width direction of the inner blade plate 12 (a direction orthogonal to the reciprocating direction a), there is a mesh-like region 20 that enters this vicinity. The cocoon enters the opening of the mesh region 20 and is cut.

  FIG. 4 is a diagram for explaining this operation. In FIG. 4, 24R is a rib that forms an opening pattern of the outer blade 24. In this embodiment, a long rectangle is aligned in the direction orthogonal to the reciprocating direction a. 20R is a rib of the mesh region 20 of the inner blade plate 12, and includes a portion 20Ra parallel to the orthogonal rib 18 shown in FIGS. 1 to 3 and inclined portions 20Rb and 20Rc forming an intersection angle θ = 60 °. Have.

  It is assumed that the inner blade 10 is now moving leftward in FIG. Of the opening of the outer blade 24, the ridge that has entered the movement trajectory of the parallel rib 20Ra of the inner blade 10 is cut by the parallel rib 20Ra. The wrinkles that have entered the movement trajectory of the inclined ribs 20Rb and 20Rc are cut by the inclined ribs 20Rb and 20Rc. The wrinkles that could not be cut smoothly at this time have an intersecting angle θ between the inclined ribs 20Rb, 20Rc and the ribs 24R of the outer blade 24, and are therefore tilted by the inclined ribs 20Rb, 20Rc and sent to the parallel rib 20Ra side. , Here can be an opportunity to be cut.

  This fallen heel has a longer portion that remains uncut near the root. The remaining wrinkles and the wrinkles that have failed to be cut by the parallel ribs 20Ra are cut again by the inclined ribs 20Rc and 20Rb having the inverted cross angle θ. In this way, the two inclined ribs 20Rb and 20Rc having different crossing angles θ with respect to the same scissors create the opportunity of cutting twice, so that the scissors are reliably cut and the sharpness can be improved. . On the other hand, for a spear that has fallen, the blade with a certain crossing angle may escape without being hit by the blade, but the blade with a different crossing angle may also hit the spear. Thus, it becomes possible to cut such a wrinkle well.

  Further, the orthogonal ribs 18 of the inner blade 10 are reinforced by the mesh region 20, and since the fine mesh region 20 is narrow, it can be made by pressing while maintaining high accuracy. In addition, since there are few fine eye areas, the durability of the mold is improved and the manufacturing yield is improved.

  FIG. 5 is a diagram showing an example of a processing procedure of the inner blade plate 12 using such press processing. First, a metal plate 30 as a material is placed on a lower mold 32 and pressed by an upper mold 34 ((A) in FIG. 5). The upper die 34 and the lower die 32 are punched (blanked) into an opening 34 that is slightly narrower than the opening pattern of the inner blade plate 12. FIG. 5B shows the metal plate 30A after the punching process.

  Next, this is placed on a flat lower base 36, and plastic working, for example, cold forging, is performed using a die 38 from above. Here, the mold 38 is slightly wider than the opening 34, and the edge of the tip (lower end) is chamfered by an inclined surface 38A. When the metal mold 38 is aligned with the opening 34 and pressed down ((C) in FIG. 5), the opening 34 is widened, the metal material flows and the thickness of the metal plate 30A increases. The crushed portion remains in the cross-sectional triangle ((D) in FIG. 5) to form the metal plate 30B.

  After the mold 38 is removed, the lower surface of the metal plate 30B, that is, the plane close to the tip side of the mold 38 is surface ground. In FIG. 5D, a virtual line 40 indicates a portion to be removed by this grinding. By this grinding, the opening 42 is opened on the lower surface of the metal plate 30B, and the rib 44 remains. The triangular section formed by the inclined surface 38A of the mold 38 becomes a blade 46 protruding from the rib 44 toward the opening 42. The tip of the blade 46 has a rake angle α that is substantially the same as the angle of the tip of the inclined surface 38A. Since the rake angle α is smaller than 90 ° and becomes an acute angle, the sharpness of the inner blade 10 is remarkably improved.

  FIG. 6 is a plan view of an inner blade plate 12A showing another embodiment. In this embodiment, mesh-like regions 20A and 20A each having two sets of opening groups extending in the reciprocating direction at two locations sandwiching the vicinity of the center of the orthogonal rib 18A are provided. Here, the mesh-like regions 20A and 20A are formed by arranging hexagonal openings in a row in the same manner as shown in FIGS.

  According to this embodiment, each orthogonal rib 18A is reinforced at two locations in the length direction, so that the strength of the inner blade plate 12A is increased and the durability is improved. Further, since the mesh-shaped regions 20A and 20A are provided at two portions other than the arch center (the top of the arc) of the outer blade, the sharpness is good even when the outer blade of the electric razor is applied not to the skin but tilted. Can be obtained.

  FIG. 7 is a plan view of an inner blade plate 12B according to another embodiment. In this embodiment, a large number of openings forming the mesh region 20B are formed by a group of openings collected in an island shape near the center of the inner blade plate 12B.

  According to this embodiment, since the mesh region 20B is collected and arranged near the center where the frequency of use is highest, durability is enhanced. In addition, since a large number of openings are arranged in an island shape, a good sharpness can be ensured not only when the electric razor is applied vertically to the skin but also when it is inclined.

  In this embodiment, only one group (opening group) in which a large number of openings are collected in an island shape is provided in the vicinity of the center. However, the present invention may distribute such a group in a plurality of locations. . For example, it may be arranged in the center and around the corners. Instead of grouping in an island shape, small groups in which the openings as shown in FIGS. 1 to 3 and FIG. 6 are arranged short may be distributed over the entire surface of the inner blade plate. In these cases, it is preferable that at least one group overlaps all the orthogonal ribs. This is because it is desirable to increase the strength of the orthogonal rib.

  8 to 12 are development views of inner blade plates 12C to 12G which are other embodiments. The inner blade plate 12C shown in FIG. 8 is a mesh of openings in which hexagonal openings are arranged in two rows so as to extend over the entire length along the center in the width direction (direction perpendicular to the reciprocating direction of the inner blade). A shaped region 20C was formed. The coarse rib is formed by an orthogonal rib 18C, and the orthogonal rib 18C is reinforced by a reinforcing rib 18C 'in the reciprocating direction.

  The inner blade plate 12D shown in FIG. 9 has the same mesh area 20D as that shown in FIG. 8, and repeats a pattern in which the coarse rib 18D is bent halfway in the reciprocating direction.

  The inner blade plate 12E shown in FIG. 10 is obtained by dividing the mesh regions 20E and 20E into two opening groups in the reciprocating direction. The coarse ribs 18E are obtained by arranging reinforcing ribs 18E 'in a staggered manner on orthogonal ribs.

  The inner blade plate 12F shown in FIG. 11 is obtained by extending the mesh region 20F from an appropriate position in a direction parallel to the coarse rib 18F based on the one shown in FIG. Here, the coarse rib 18F is inclined at both sides of the center in the width direction. That is, in FIG. 11, the lower coarse rib 18F is an orthogonal rib, but the upper coarse rib 18F 'is a parallel rib inclined at a certain angle.

  The inner blade plate 12G shown in FIG. 12 forms a rough hexagonal opening with coarse ribs 18G as a whole, and an auxiliary rib 20G ′ that divides the opening into smaller openings only in a part of the openings. By adding this, a mesh-like region 20G is obtained. Here, the auxiliary ribs 20G 'are provided in two rows of hexagonal openings extending over the entire length in the center in the width direction, and a mesh region 20G is formed by an opening group consisting of small openings divided by these auxiliary ribs 20G'. did.

The disassembled perspective view of the inner blade which is one Example of this invention Plan view showing a part of the inner blade plate omitted III-III sectional view in FIG. The figure explaining the cutting | disconnection by a mesh area | region Diagram showing inner blade plate processing method The figure which shows another Example The figure which shows another Example The figure which shows another Example The figure which shows another Example The figure which shows another Example The figure which shows another Example The figure which shows another Example

Explanation of symbols

10 Inner blade 12, 12A-12G Inner blade plate 18, 18A-18G Orthogonal rib (coarse rib)
20, 20A to 20G Mesh area 20R Rib of inner blade plate 24 Outer blade 24R Rib of outer blade 46 Blade α Rake angle

Claims (11)

In a reciprocating electric shaver that includes an outer blade and an inner blade made of a metal plate each curved in an arch shape and formed with a large number of openings, and reciprocates while the inner blade is in sliding contact with the inner surface of the outer blade.
The inner blade has coarse ribs that form a large number of coarse openings arranged in the reciprocating direction and a mesh-like region composed of a large number of fine openings in a sliding contact range with the outer blade. A reciprocating electric razor characterized by.   2. The reciprocating electric shaver according to claim 1, wherein the coarse ribs are parallel ribs arranged in parallel at regular intervals.   2. A reciprocating electric shaver according to claim 1, wherein the coarse rib is an orthogonal rib substantially orthogonal to the reciprocating direction of the inner blade.   The reciprocating electric shaver according to claim 1, 2 or 3, wherein the fine openings in the mesh region are polygonal.   5. The reciprocating electric shaver according to claim 1, wherein the mesh-like region connects the coarse ribs in the reciprocating direction of the inner blade in at least a part of the circumferential direction of the inner blade.   The reciprocating electric shaver according to any one of claims 1 to 4, wherein the mesh region is formed by a set of aperture groups arranged so as to connect the coarse ribs in the reciprocating direction in the vicinity of the center in the circumferential direction of the inner blade.   The reciprocating type according to any one of claims 1 to 5, wherein the mesh-like region is formed by two sets of opening groups arranged so as to connect the coarse ribs in the reciprocating direction on both sides sandwiching the vicinity of the center in the circumferential direction of the inner blade. Electric razor.   The reciprocating electric shaver according to any one of claims 1 to 4, wherein the mesh-like region is formed by a large number of openings gathering in the vicinity of the center in the circumferential direction of the inner blade and in the vicinity of the center in the width in the reciprocating direction.   5. The reciprocating electric shaver according to claim 4, wherein the opening in the mesh area is a polygon having at least three sides that are non-parallel to the reciprocating direction of the inner blade.   The reciprocating electric shaver according to any one of claims 1 to 9, wherein the opening in the mesh region is hexagonal. The inner blade is made by plastic working and grinding a metal plate, and a blade having a rake angle of 90 ° or less is made on the edge of the coarse rib and the opening of the mesh region on the blade surface side. Either reciprocating electric razor.

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