CN109068814B - Fastener element, device for manufacturing fastener element, and method for manufacturing fastener element - Google Patents

Fastener element, device for manufacturing fastener element, and method for manufacturing fastener element Download PDF

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Publication number
CN109068814B
CN109068814B CN201680084671.8A CN201680084671A CN109068814B CN 109068814 B CN109068814 B CN 109068814B CN 201680084671 A CN201680084671 A CN 201680084671A CN 109068814 B CN109068814 B CN 109068814B
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Prior art keywords
fastener
fastener element
tape
cutout
forming
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CN201680084671.8A
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CN109068814A (en
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斋藤力
古里太
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YKK Corp
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YKK Corp
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    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B19/00—Slide fasteners
    • A44B19/42—Making by processes not fully provided for in one other class, e.g. B21D53/50, B21F45/18, B22D17/16, B29D5/00
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B19/00—Slide fasteners
    • A44B19/02—Slide fasteners with a series of separate interlocking members secured to each stringer tape
    • A44B19/04—Stringers arranged edge-to-edge when fastened, e.g. abutting stringers
    • A44B19/06—Stringers arranged edge-to-edge when fastened, e.g. abutting stringers with substantially rectangular members having interlocking projections and pieces
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B19/00—Slide fasteners
    • A44B19/02—Slide fasteners with a series of separate interlocking members secured to each stringer tape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/46—Making other particular articles haberdashery, e.g. buckles, combs; pronged fasteners, e.g. staples
    • B21D53/50—Making other particular articles haberdashery, e.g. buckles, combs; pronged fasteners, e.g. staples metal slide-fastener parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F45/00—Wire-working in the manufacture of other particular articles
    • B21F45/16—Wire-working in the manufacture of other particular articles of devices for fastening or securing purposes
    • B21F45/18—Wire-working in the manufacture of other particular articles of devices for fastening or securing purposes of slide fastener elements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Slide Fasteners (AREA)

Abstract

A fastener element (10) of the present invention has a coupling head (11) and a tape clamping portion (16) having a crotch portion (17), a first leg portion (18a), and a second leg portion (18 b). The tape clamping portion (16) has at least one cutout portion (21) that opens to the tape clamping surface (19), and a bulging portion (22) that bulges out adjacent to the bottom surface (21a) of the cutout portion (21) in the fastener element thickness direction. The fastener element (10) can be easily manufactured from a Y-shaped wire material (50). In addition, the slip strength and the pull-off strength of the fastener element (10) can be increased by implanting the fastener element (10) into the fastener tape (3).

Description

Fastener element, device for manufacturing fastener element, and method for manufacturing fastener element
Technical Field
The present invention relates to a metal fastener element having a coupling head portion in which a coupling concave portion is formed on a first surface and a coupling convex portion is formed on a second surface, and a manufacturing apparatus and a manufacturing method for manufacturing the fastener element.
Background
A metal fastener element (hereinafter, also simply referred to as a metal element) generally includes a coupling head and a tape clip extending from a base end portion of the coupling head. In addition, the belt clamping portion has a crotch portion continuously extending from the engaging head portion, and a pair of first and second leg portions branched and further extending from the crotch portion. In this case, the belt sandwiching space is formed between the first leg portion and the second leg portion, and the belt sandwiching surface is continuously formed from the first leg portion to the second leg portion of the belt sandwiching portion via the crotch portion. Such a metal element is generally manufactured mainly by the following two representative methods.
First, a first manufacturing method of manufacturing a metal fastener element is as follows: a metallic fastener element is manufactured by plastically deforming a metallic flat wire material by pressing such as press working to form a coupling head portion or the like, and further punching or cutting the formed flat wire material into the shape of a fastener element by a punch, a die or the like. In the case of this first manufacturing method, the fastener elements are manufactured in a scattered state.
The fastener element thus obtained is subjected to a grinding step such as tumbling or chemical polishing, or a coating step such as clear coating on the surface of the element, and then implanted one by one into one side edge portion of the fastener tape at a fixed interval using a caulking mechanism. Thus, a fastener stringer in which a plurality of metal elements are arranged on a fastener tape is manufactured.
Next, in a second manufacturing method for manufacturing a metal fastener element, a long metal wire rod having, for example, a circular cross section is first passed through a plurality of rolls and is molded so as to have a substantially Y-shaped cross section, thereby manufacturing a fastener element wire rod having a substantially Y-shaped cross section (so-called Y-shaped wire rod). Next, the obtained wire rod is cut in sequence at a desired thickness in the longitudinal direction of the wire rod by using a cutting punch (cutting punch) and a cutting die (cutting die), to form an element having a provisional engagement head and a tape clamping portion extending from the provisional engagement head.
Then, the temporary coupling head portion of the obtained element is press-formed from the first surface side thereof in the element thickness direction by using a forming die and a forming punch to be plastically deformed. Thus, a metal fastener element having a coupling head portion having a coupling concave portion formed on a first surface and a coupling convex portion formed on a second surface, and the clip portion extending from the coupling head portion is manufactured.
The second production method and the production apparatus used for the second production method are described in, for example, japanese patent publication No. 63-6295 (patent document 1), japanese patent No. 2744383 (patent document 2), international publication No. 2015/049767 (patent document 3), and the like.
The metal fastener element manufactured by the second manufacturing method described above is sometimes called a one-sided fastener element because the engaging concave portion and the engaging convex portion are formed on the opposite surface of the engaging head portion. Further, the fastener stringer manufactured by the second method is manufactured by continuously performing an implanting process by a caulking portion (caulking punch) after the formation of the coupling convex portion and the coupling concave portion, and sequentially attaching the fastener elements one by one to one side edge portion of the fastener tape. If necessary, the manufactured single-sided fastener element may be subjected to a grinding step such as barreling before the step of implanting the element into the fastener tape.
The second manufacturing method of manufacturing the metal fastener element from the wire material having the substantially Y-shaped cross section as described above has an advantage that the fastener stringer and the slide fastener can be manufactured at low cost, although the shape of the fastener element is limited, compared to the first manufacturing method of manufacturing the metal fastener element from the metal flat wire material.
However, in a metal fastener element having a coupling head portion and a tape clamping portion, it is generally required to have high pull-out strength, which indicates strength with which the metal fastener element does not come off from a fastener tape when a force in a tape width direction of the fastener tape is received, and high slip strength, which indicates strength with which an attachment position does not deviate when the metal fastener element receives a force in a tape length direction.
For example, the inventions relating to the improvement of the sliding strength of the metal element are disclosed in Japanese Kokai publication Sho 52-64106 (patent document 4), Japanese Kokoku publication Sho 56-35052 (patent document 5), and Japanese Kokoku publication Sho 57-48405 (patent document 6).
As an example, as shown in a perspective view of a metal element 90 described in patent document 6 of fig. 13, the metal element 90 of patent document 6 is provided with a plurality of projecting portions 93 projecting in a direction orthogonal to the element thickness direction so as to partially project from a tape clamping surface 92 of a tape clamping portion 91 toward a clamping space where a fastener tape is clamped.
In the metal element 90, normally, in a state where a fastener tape is inserted into the tape clamping portion 91, the first leg portion 94a and the second leg portion 94b of the tape clamping portion 91 are pressed so as to approach each other and pressed to be plastically deformed, whereby the metal element 90 is attached (implanted) to the fastener tape.
Therefore, by providing the plurality of projecting portions 93 as described above in the tape gripping portion 91 of the metal element 90, the projecting portions 93 can be partially sunk into the fastener tape when the metal element 90 is attached to the fastener tape. As a result, the above-described sliding strength of the metal element 90 with respect to the fastener tape can be effectively improved.
Documents of the prior art
Patent document
Patent document 1: japanese examined patent publication No. 63-6295
Patent document 2: japanese patent No. 2744383
Patent document 3: international publication No. 2015/049767
Patent document 4: japanese Kokai publication Sho-52-64106
Patent document 5: japanese Kokoku publication Sho 56-35052
Patent document 6: japanese Kokoku publication Sho 57-48405
Disclosure of Invention
As a method of manufacturing the metal fastener element, there are generally known a first manufacturing method of manufacturing from a flat wire made of metal and a second manufacturing method of manufacturing from a wire having a substantially Y-shaped cross section (Y-shaped wire) as described above. In addition, in the case of using the second manufacturing method, the metal element is manufactured by press-forming the element cut out from the Y-shaped wire material in the element thickness direction as described above.
However, for example, in the case of manufacturing a conventional metal element 90 shown in fig. 13, it is necessary to provide a plurality of projecting portions 93 projecting in a direction orthogonal to the element thickness direction in the belt clamping portion 91 of the metal element 90. Therefore, it is difficult to manufacture the metal element 90 having the plurality of projecting portions 93 by using the conventional second manufacturing method which can only perform press working of the provisional engagement head portion in the element thickness direction.
Further, for example, in the case where the metal element 90 shown in fig. 13 is manufactured by using the first conventional manufacturing method, since the belt clamping portion of the manufactured metal element can be press-worked from the direction orthogonal to the element thickness direction, the projecting portion 93 as described above can be formed so as to project from the belt clamping surface 92. However, in this case, it is difficult to secure a large projection height (projection amount) of the projecting portion 93 from the belt clamping surface 92 of the belt clamping portion 91.
Therefore, when a metal fastener element manufactured from a flat metal wire is subjected to, for example, a grinding process, a protruding portion provided in a belt clamping portion of the metal fastener element may be ground in the grinding process and become very small or disappear. Therefore, even when the polishing step is performed after the fastener element is manufactured, a technology is developed which can form a protrusion with an appropriate size in the tape clamping portion of the fastener element and stably improve the sliding strength.
The present invention has been made in view of the above-described conventional problems, and a specific object thereof is to provide a metal fastener element which is provided with a protruding portion having a protruding height capable of increasing a sliding strength stably at a tape nipping portion and which can be manufactured at low cost by a method of cutting out an element from a wire material having a substantially Y-shaped cross section, and a manufacturing apparatus and a manufacturing method for manufacturing the fastener element.
In order to achieve the above object, a fastener element according to the present invention is a metal fastener element for a slide fastener, having, as a basic configuration, a coupling head portion and a tape clamping portion extending from the coupling head portion, wherein a coupling concave portion is concavely provided on a first surface of the coupling head portion, and a coupling convex portion is protrudingly provided on a second surface of the coupling head portion, the tape clamping portion includes a crotch portion extending from the coupling head portion, and a pair of first leg portions and a second leg portion branching from the crotch portion and further extending, and a tape clamping surface is continuously formed from the first leg portion to the second leg portion via the crotch portion, and the fastener element is characterized in that the tape clamping portion includes: at least one cutout portion that is recessed from at least one of the first surface and the second surface of the tape holding portion in the thickness direction of the fastener element and that opens at the tape holding surface; and a bulging portion bulging from the tape nipping surface adjacent to a bottom surface of the cutout portion in a thickness direction of the fastener element.
In the fastener element of the present invention, it is preferable that the bottom surface of the cutout portion and the distal end surface of the bulging portion are formed as a continuous single surface.
Preferably, the cutout portion is formed in a tapered shape such that a spatial cross section orthogonal to the fastener element thickness direction gradually decreases toward the bottom surface of the cutout portion.
Further preferably, the plurality of cutout portions and the plurality of bulge portions are formed symmetrically with respect to a center plane in the element width direction.
In the fastener element according to the present invention, it is preferable that the tape nipping portion has a ridge portion continuously provided on the tape nipping surface so as to protrude in the element thickness direction.
Further, preferably, the cutout portion is recessed from the first surface of the belt sandwiching portion.
Next, the manufacturing apparatus of the fastener element provided by the present invention has, as a basic configuration: a wire material supply unit that intermittently supplies a wire material for a fastener element having a substantially Y-shaped cross section at a predetermined pitch in a longitudinal direction; a cutting punch for cutting the element wire material to a predetermined thickness to form an element having a provisional engagement head and a tape clamping portion extending from the provisional engagement head; and an element forming portion that press-forms the temporary coupling head of the element, wherein a coupling concave portion is formed on a first surface of the temporary coupling head, and a coupling convex portion is formed on a second surface of the temporary coupling head, and the element forming portion is characterized by including a protrusion-shaped pressing portion that forms a notch portion provided in the tape nipping portion in a recessed manner by locally pressing the tape nipping portion of the element from the first surface in an element thickness direction and plastically deforming the tape nipping portion, and a bulge portion that bulges adjacent to a bottom surface of the notch portion by plastic flow generated along with formation of the notch portion.
In the manufacturing apparatus of the present invention, it is preferable that the element forming portion includes: a molding die on which the element is placed; a pressing pad which is arranged to be able to be lifted relative to the molding die and presses the tape nipping portion of the fastener element toward the molding die; and a forming punch which is disposed to be able to be lifted relative to the forming die and which performs the press forming of the temporarily engaging head portion of the element held between the forming die and the press pad, the press pad including: an element fixing portion that presses the tape clamping portion of the fastener element with a distal end surface; and an insertion portion that is provided perpendicularly to the distal end surface of the element fixing portion and is inserted between the first leg portion and the second leg portion of the tape nipping portion, wherein the protruding pressing portion is provided protruding from the outer peripheral side surface of the insertion portion at the proximal end portion of the insertion portion of the pressure pad.
In this case, it is preferable that the protruding pressing portion of the pressing pad has a shape in which an area of a cross section orthogonal to a vertical direction in which the insertion portion is provided decreases with distance from a distal end surface of the element fixing portion.
Next, a method for manufacturing a fastener element provided by the present invention includes: cutting an element wire material having a substantially Y-shaped cross section to a predetermined thickness to form an element having a provisional engagement head and a band clamp portion extending from the provisional engagement head; and press-forming the temporary coupling head of the element, forming a coupling concave portion on a first surface of the temporary coupling head, and forming a coupling convex portion on a second surface of the temporary coupling head, wherein the method for manufacturing a fastener element includes: when the tape nipping portion of the element is pressed in the press forming of the temporary engagement head, the tape nipping portion of the element is partially pressed from the first surface in the element thickness direction and plastically deformed, thereby forming a cutout portion provided in the tape nipping portion as a recess, and a bulging portion bulging out adjacent to a bottom surface of the cutout portion by plastic flow generated along with the formation of the cutout portion.
Effects of the invention
In the fastener element of the present invention, the belt gripping portion extending from the engaging head portion has a belt gripping surface continuously formed from the first leg portion to the second leg portion of the belt gripping portion via the crotch portion. Further, the belt clamping portion includes: at least one cutaway portion recessed from at least one of the first surface and the second surface of the band clamp portion in a thickness direction of the fastener element; and a bulging portion provided corresponding to the cutout portion and bulging from the tape nipping surface adjacent to a bottom surface of the cutout portion in the thickness direction of the fastener element.
In the case of manufacturing the fastener element of the present invention, the tape nipping portion may be provided with a cutout portion extending in the thickness direction of the element, and the bulging portion may be provided corresponding to the cutout portion. Therefore, the fastener element of the present invention can be easily manufactured by press working the element cut out from the wire rod having the substantially Y-shaped cross section in the element thickness direction in the second manufacturing method described above. Therefore, the fastener element in which the bulging portion bulges out from the tape clamping surface of the tape clamping portion can be provided at low cost.
In the fastener element of the present invention, the size (particularly, the height) of the bulge portion can be easily increased in accordance with the size of the cutout portion. Thus, when the fastener element is attached to the fastener tape, the bulge portion formed largely in the fastener element can be deeply caught in the fastener tape (particularly, the core string portion of the fastener tape), and the fastener tape can be caught (entered) in the formed cut portion. As a result, the sliding strength of the fastener element with respect to the fastener tape can be easily increased, and the pull-off strength of the fastener element can also be improved.
Further, since the bulging portion can be formed in the fastener element so as to increase the bulging height as described above, when the manufactured fastener element is subjected to a polishing step such as barreling before being attached to a fastener tape, for example, the bulging portion can stably have an appropriate size (bulging height) capable of improving the sliding strength even if it is slightly worn away in the polishing step.
In the fastener element of the present invention, the bottom surface of the cutout portion and the distal end surface of the bulge portion are formed as a continuous single surface. Thereby, the bulging portion is stably formed on the belt clamping surface of the belt clamping portion. In addition, the bulge portion can be easily formed large in accordance with the size of the cutout portion.
The notch portion provided in the tape holding portion is formed in a tapered shape such that a spatial cross section orthogonal to the fastener element thickness direction gradually decreases toward a bottom surface of the notch portion. Thus, when the fastener element is manufactured, the cutout portion can be formed into a predetermined shape and size, and the bulge portion corresponding to the cutout portion can be stably formed. In addition, in the element forming portion for press-working the element in the manufacturing apparatus of the fastener element, the strength of the protruding pressing portion forming the cutout portion can be easily ensured, and the protruding pressing portion can be effectively prevented from being damaged.
In the present invention, the plurality of cutout portions and the plurality of bulge portions are formed symmetrically with respect to the center plane in the element width direction. Thus, since the fastener element can be mounted by symmetrically inserting the bulge portion of the fastener element into the front and back surfaces of the fastener tape, the sliding strength of the fastener element can be effectively increased. In addition, even if the fastener element attached to the fastener tape receives an external force, the posture of the fastener element can be stably maintained.
In the present invention, the tape clamping portion of the fastener element further includes a protruding strip portion that protrudes continuously in the element thickness direction on the tape clamping surface. This can further increase the sliding strength of the fastener element and improve the pull-off strength of the fastener element with respect to the fastener tape.
In addition, the cutout portion of the fastener element is recessed from the first face of the tape clamping portion. Thus, when the fastener element is manufactured from the element by the fastener element manufacturing apparatus, the cutout portion and the bulge portion can be smoothly and stably formed by performing the press working from above the first surface of the element provided with the engaging recess portion. In this case, the shape of the pressing pad of the element forming portion disposed in the conventional manufacturing apparatus can be changed to relatively easily cope with the situation, and therefore, the facility cost required for improvement can be reduced.
Next, the manufacturing apparatus for a fastener element provided by the present invention includes a wire material supplying portion that supplies a wire material for an element along a longitudinal direction, a cutting punch that cuts the wire material for the element to a predetermined thickness to form an element, and an element forming portion that press-forms the element to form a coupling concave portion and a coupling convex portion. The element forming portion has a projecting pressing portion for plastically deforming the belt clamping portion of the element by locally pressing the element in the thickness direction.
In this case, the projecting pressing portion is formed so as to be capable of press-working the tape nipping portion in the thickness direction of the fastener element to a predetermined depth. The projecting pressing portion has the following configuration: it is possible to form a cutout portion recessed in the fastener element thickness direction and opening in the belt clamping surface of the belt clamping portion, and to form a bulging portion protruding adjacent to the bottom surface of the cutout portion by plastic flow accompanying the formation of the cutout portion.
According to the manufacturing apparatus of the present invention having the projecting pressing portion in the element forming portion as described above, the fastener element of the present invention having the cutout portion and the protruding portion arranged corresponding to the cutout portion in the tape nipping portion can be manufactured continuously and stably from the element wire material having the substantially Y-shaped cross section.
In the above-described manufacturing apparatus of the present invention, the element forming portion includes: a molding die on which the element is placed; a pressing pad which is arranged to be able to be lifted relative to the molding die and presses the tape nipping portion of the fastener element toward the molding die; and a forming punch which is arranged to be movable up and down with respect to the forming die and which performs press forming of the element.
Further, the pressure pad includes: a component fixing portion that presses a tape clamping portion of the fastener element with a distal end surface; and an insertion portion that is provided perpendicularly to a tip end surface of the element fixing portion and is inserted between the first leg portion and the second leg portion of the belt clamping portion. In this case, a projecting pressing portion, which forms a cutout portion at the tape clamping portion of the element, is provided projecting from the outer peripheral side surface of the insertion portion in a direction orthogonal to the vertical direction in which the insertion portion is provided, at the base end portion of the insertion portion of the pressure pad.
Since the element forming portion has the above-described forming die, pressing pad, and forming punch, the element forming portion capable of press-forming the element can be formed with a relatively simple structure. Further, by press-forming the element by the element forming portion, it is possible to stably manufacture the fastener element having the engaging concave portion and the engaging convex portion at the engaging head portion and having the cutout portion and the bulge portion at the tape nipping portion.
In this case, the protruding pressing portion of the pressing pad has a shape in which the area of a cross section perpendicular to the vertical direction of installation of the insertion portion decreases with distance from the distal end surface of the element fixing portion. This makes it easy to secure the strength of the projecting pressing portion of the pressure pad, and the projecting pressing portion can be formed so as not to be easily broken. Further, the protruding pressing portion can form a cutout portion in a predetermined shape and size in the tape clamping portion of the fastener element, and stably form a bulging portion corresponding to the cutout portion.
Next, the method for manufacturing a fastener element according to the present invention includes cutting the element wire material to a predetermined thickness to form an element, and press-forming the element to form a coupling concave portion and a coupling convex portion. In addition, the manufacturing method of the present invention includes: when the tape nipping portion of the element is pressed in the press forming of the temporary engaging head, press working is performed in which the tape nipping portion of the element is pressed locally in the element thickness direction and is plastically deformed.
By performing the press working as described above, the cutout portion recessed in the fastener element thickness direction and opened in the belt clamping surface of the belt clamping portion can be stably formed in the belt clamping portion. In addition, the bulge portion bulging out adjacent to the bottom surface of the cutout portion by plastic flow accompanying the formation of the cutout portion can be stably formed at the same time as the cutout portion is formed.
Therefore, according to the manufacturing method of the present invention including the steps described above, the fastener element of the present invention having the cutout portion and the bulge portion arranged corresponding to the cutout portion at the tape nipping portion can be continuously, efficiently, and stably manufactured from the element wire material having the substantially Y-shaped cross section.
Drawings
Fig. 1 is a plan view showing a slide fastener having fastener elements of the present invention.
Fig. 2 is a perspective view showing a fastener element before being attached to a fastener tape.
Fig. 3 is a bottom view of the fastener element as viewed from the second surface (lower surface) side.
Fig. 4 is a side view of the fastener element as viewed from the side.
Fig. 5 is a cross-sectional view taken along line V-V of fig. 3.
Fig. 6 is an enlarged perspective view of a main portion of a cutout portion and a bulge portion provided in the fastener element.
Fig. 7 is a main part enlarged perspective view showing an enlarged main part of the fastener element manufacturing apparatus.
Fig. 8 is an enlarged perspective view showing a lower end portion of a pressure pad (pressure pad) arranged in a manufacturing apparatus in an enlarged manner.
Fig. 9 is a schematic view showing a state in which the fastener element wire material protrudes on the sliding contact surface of the cutting die in the manufacturing apparatus.
Fig. 10 is a schematic view showing a state after element elements are cut out from the element wire material in the manufacturing apparatus.
Fig. 11 is a schematic view showing a state where the fastener element is formed into the fastener element by press working in the manufacturing apparatus.
Fig. 12 is a perspective view showing the fastener element.
Fig. 13 is a perspective view showing a conventional fastener element.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments described below, and various modifications can be made as long as the present invention has substantially the same configuration and exhibits the same operational effects as the present invention.
Fig. 1 is a plan view showing a slide fastener of the present embodiment. Fig. 2, 3, and 4 are a perspective view, a bottom view, and a side view of the fastener element, respectively. Fig. 5 is a cross-sectional view taken along line V-V shown in fig. 3, and fig. 6 is an enlarged perspective view showing a main portion of the fastener element.
In the following description of the fastener element, the vertical direction or the thickness direction of the fastener element refers to a direction in the tape longitudinal direction when the fastener element is attached to a fastener tape, and particularly, the first surface of the fastener element on which the coupling concave portion is formed is a lower surface, and the second surface on which the coupling convex portion is formed is an upper surface.
The longitudinal direction or the longitudinal direction of the fastener element means a direction which is a tape width direction of the fastener tape when the fastener element is attached to the fastener tape, and particularly, the distal end direction of the coupling head is set as a front side, and the extending direction of the first leg portion and the second leg portion is set as a rear side. The left-right direction or the width direction of the fastener element means a direction which becomes a tape normal-reverse direction when the fastener element is attached to a fastener tape.
The slide fastener 1 of the present embodiment includes: a pair of first fastener stringers 2a and second fastener stringers 2b in which a plurality of metal fastener elements 10 are arranged on opposing tape side edge portions of the pair of fastener tapes 3 to form a fastener element row 7; a first stopper 4 (also referred to as an upper stopper) disposed adjacent to the element row 7 at one end of the first and second fastener stringers 2a, 2 b; a second stopper 5 (also referred to as a lower stopper) disposed adjacent to the element row 7 so as to straddle the other end portions of the first and second fastener stringers 2a, 2 b; and a slider 6 which is slidably disposed along the element row 7 and engages and separates the element row 7 of the first and second fastener stringers 2a, 2 b.
In this case, a core portion 3a bulging in the tape front-back direction is provided at the tape side edge portion of the fastener tape 3. Hereinafter, the element row 7 formed in the first fastener stringer 2a is referred to as a first element row 7a, and the element row 7 formed in the second fastener stringer 2b is referred to as a second element row 7 b.
The slide fastener 1 of the present embodiment is characterized by the form of the metal fastener element 10 forming the element row 7, and components other than the metal element 10 are formed in the same manner as in a conventional ordinary slide fastener. Therefore, in the following description, the form of the metal element 10 will be mainly described, and specific description of the components other than the metal element 10 will be omitted.
The metal element 10 of the present embodiment is made of a metal such as a copper alloy, a nickel alloy, or an aluminum alloy, and a plurality of metal elements 10 are attached to the tape side edge portion of the fastener tape 3 at regular intervals along the tape longitudinal direction.
Each metal element 10 has: a coupling head 11 having a coupling concave portion 12 and a coupling convex portion 13; and a belt gripping portion 16 extending rearward from the engaging head 11. The belt clamping portion 16 includes a crotch portion 17 formed continuously and integrally from the engaging head 11, and a pair of left and right first leg portions 18a and a second leg portion 18b extending rearward from the crotch portion 17.
In this case, the belt clamping portion 16 of the metal fastener element 10 has a clamping space 20 surrounded by the crotch portion 17 and the first and second leg portions 18a and 18 b. Further, the belt sandwiching portion 16 is formed with a belt sandwiching surface 19 which is continuous from the first leg portion 18a to the second leg portion 18b via the crotch portion 17 and faces the sandwiching space 20. The metal element 10 of the present embodiment is formed symmetrically with respect to a plane passing through the center in the element width direction as a plane of symmetry.
The fastener element 10 schematically shown in fig. 2 to 5 has a form before being attached to the fastener tape 3, that is, a substantially Y-shaped form in which the first leg portion 18a and the second leg portion 18b of the tape clamping portion 16 are separated in the element width direction. In the fastener element 10, in a state where the tape side edge portion of the fastener tape 3 is inserted between the first leg portion 18a and the second leg portion 18b and the tape side edge portion is held in the clamping space 20 in abutment with the tape clamping surface 19 of the crotch portion 17, the first leg portion 18a and the second leg portion 18b are pressed in a direction to approach each other and are plastically deformed, whereby the fastener element 10 is attached to the fastener tape 3.
In the present embodiment, the lower surface (first surface) of the engaging head 11 is provided with an engaging recess 12 in a recessed manner, and the upper surface (second surface) of the engaging head 11 is provided with an engaging protrusion 13 in a protruding manner. In this case, the engaging convex portion 13 is formed at a position corresponding to the engaging concave portion 12 on the upper surface of the engaging head portion 11 so as to bulge upward in a dome shape. The engagement concave portion 12 has a bottomed hole shape having a housing space capable of housing therein the engagement convex portion 13 of the metal element 10 to be engaged. In this case, the bottom surface of the engagement recess 12 is formed as a flat surface parallel to the lower surface of the engagement head 11.
In the slide fastener 1 shown in fig. 1, the coupling head 11 of the present embodiment includes a tip inclined portion 14 formed at a tip end portion (tip end portion) on a lower surface side of the coupling head 11 and a chamfered portion 15 provided on an upper surface side of the coupling head 11, in order to reduce sliding resistance when the slider 6 is slid.
The tip inclined portion 14 has an inclined surface inclined at a certain angle from the lower surface of the engagement head portion 11 toward the tip end surface. In addition, the distal end inclined portion 14 is formed such that the width dimension of the inclined surface gradually increases toward the distal end of the coupling head 11 in the bottom view (fig. 3) of the fastener element 10. The chamfered portion 15 is provided at the outer peripheral edge portion on the upper surface side of the engagement head portion 11 in such a shape that a corner portion between the upper surface of the engagement head portion 11 and the distal end surface and the side surface of the engagement head portion 11 is chamfered.
Since the engagement head 11 of the metal element 10 is provided with the distal end inclined portion 14 and the chamfered portion 15 as described above, when the slider 6 of the slide fastener 1 is slid to engage or disengage the first element row 7a and the second element row 7b, the fastener elements 10 of the first element row 7a and the fastener elements 10 of the second element row 7b can be made to collide with or hook each other in the element guide path of the slider 6 with difficulty. As a result, the sliding resistance of the slider 6 is prevented from increasing, and the sliding operation of the slider 6 can be performed easily.
The belt clip 16 of the metal fastener element 10 includes: four cutout portions 21 that are cutout from the lower surface (first face) of the belt clamping portion 16; four bulging portions 22 formed corresponding to the four cutout portions 21, respectively; and two protruding strip portions 23 continuously protruding in the fastener element thickness direction on the tape nipping surface 19.
As shown in fig. 6 in an enlarged manner, the cutout portion 21 is formed by being cut out in the thickness direction of the fastener element from the lower surface of the belt clamping portion 16. In addition, the cutout portion 21 opens to the lower surface of the belt clamping portion 16 and the belt clamping surface 19. In this case, the cutout 21 includes: a flat bottom surface 21a disposed parallel to the lower surface of the belt clamping portion 16; a pair of side wall surfaces 21b rising from the bottom surface 21a and formed in a planar shape so as to face each other; and an inner end surface (inner end surface) 21c rising from the bottom surface 21a and formed in a planar shape farthest from the tape nipping surface 19.
The internal space of the cutout portion 21 is formed so that a cross section orthogonal to the fastener element thickness direction is rectangular. In this case, the cutout portion 21 is formed such that the pair of side wall surfaces 21b are inclined with respect to the fastener element thickness direction so that the distance between the pair of side wall surfaces 21b gradually increases from the lower surface of the belt clamping portion 16 toward the bottom surface 21a of the cutout portion 21.
The inner end surface 21c of the cutout portion 21 is formed along the fastener element thickness direction, and the inner end surface 21c of the cutout portion 21 is arranged substantially parallel to the belt sandwiching surface 19 of the belt sandwiching portion 16. In the present invention, the inner end surface 21c of the cutout portion 21 may be formed obliquely to the element thickness direction so that a cross section of the internal space of the cutout portion 21 perpendicular to the element thickness direction is reduced toward the bottom surface 21a of the cutout portion 21.
The bulging portion 22 of the belt gripping portion 16 is formed at a position adjacent to the bottom surface 21a of the cutout portion 21 in the fastener element thickness direction so as to project from the belt gripping surface 19 toward the belt gripping space 20. When the element 30 is pressed by the pressure pad 43 (see fig. 12) as described later, the bulge portion 22 is formed by the protruding pressing portion 43c of the pressure pad 43 at the same time as the cutout portion 21 is formed. That is, the bulge portion 22 is formed by plastic flow generated along with the formation of the cut portion 21. Therefore, in the fastener element 10, one bulging portion 22 is formed corresponding to one cutout portion 21.
The bulging portion 22 has a flat tip end surface 22a formed at a position closest to the lower surface of the belt clamping portion 16. The distal end surface 22a of the bulging portion 22 is formed continuously from the bottom surface 21a of the cutout portion 21, and is arranged in parallel with the lower surface of the belt clamping portion 16. The distal end surface 22a of the bulging portion 22 and the bottom surface 21a of the cutout portion 21 form a single flat surface. Further, the bottom surface 21a of the cutout portion 21 and the distal end surface 22a of the bulging portion 22 may be formed to be inclined downward from the inner end surface 21c toward the distal end of the bulging portion 22 with respect to the lower surface of the tape holding portion 16. The bulging portion 22 has a form in which the area of the cross section orthogonal to the element thickness direction becomes smaller as the distance from the distal end surface 22a of the bulging portion 22 increases.
The height (amount of projection) of the bulging portion 22 from the belt clamping surface 19 is largest at the tip end surface 22a of the bulging portion 22 and a portion (tip end portion) in the vicinity thereof. In this case, the height of the protrusion from the belt clamping surface 19 at the distal end portion of the protrusion 22 is set to be greater than the height of the protrusion 23. The lateral dimension of the bulge 22 along the tape nipping surface 19 is also set larger than the lateral dimension of the ridge 23 along the tape nipping surface 19.
In the metal element 10 of the present embodiment, the cutout portion 21 and the bulge portion 22 corresponding to the cutout portion 21 are arranged along the element thickness direction. In addition, in a bottom view of the metal element 10 as viewed from below, the four cutout portions 21 and the bulging portions 22 are provided at positions spaced apart from each other at equal intervals at the belt sandwiching portion 16 of the metal element 10.
The protruding portion 23 of the belt clamping portion 16 is formed in the entire fastener element thickness direction from the position of the upper surface of the belt clamping portion 16 to the position of the lower surface of the belt clamping portion 16 along the fastener element thickness direction. The cross section of the ridge portion 23 orthogonal to the element thickness direction has the same shape over the entire element thickness direction. In the present embodiment, the cross section of the protruding portion 23 perpendicular to the element thickness direction is substantially triangular. By providing such a protruding portion 23 in the tape nipping portion 16, the pull-off strength and the sliding strength of the fastener element 10 with respect to the fastener tape 3 can be effectively improved.
The fastener element 10 of the present embodiment described above is manufactured using the manufacturing apparatus 40 described below.
The manufacturing apparatus 40 used in the present embodiment manufactures the fastener element 10 in which the coupling concave portion 12 and the coupling convex portion 13 are formed in the coupling head portion 11 by cutting a metal element wire material (Y-shaped wire material) 50 having a substantially Y-shaped cross section to a predetermined thickness to form the element 30 (fig. 12), and press-forming the element 30 formed by the element forming portion 41.
In particular, the manufacturing apparatus 40 of the present embodiment is characterized by an element forming portion 41 that performs press forming of the element 30. The element forming portion 41 is configured to form the cutout portion 21 and the bulge portion 22 in the tape clamping portion 16 of the element 30, while forming the engaging concave portion 12 and the engaging convex portion 13. Therefore, although the structure of the manufacturing apparatus 40 will be described below, the manufacturing apparatus 40 will be described centering on the element forming portion 41 because the portion of the manufacturing apparatus 40 other than the element forming portion 41 is substantially the same as the conventional apparatus.
The manufacturing apparatus 40 of the present embodiment includes: a wire material supply unit (not shown) for intermittently supplying the wire material 50 for the fastener element at a predetermined pitch; a wire material cutting portion for forming the fastener element 30 by cutting the wire material 50 to a predetermined thickness by the cutting die 46 and the cutting punch 47; and an element forming portion 41 for press forming the element 30 after the cutting.
In addition, the manufacturing apparatus 40 of the present embodiment is further provided with: an element attaching portion 48 (caulking punch 48a) which plastically deforms the fastener elements 10 produced by press forming by the element forming portion 41 by pressing, thereby attaching the fastener elements 10 to the fastener tape 3 in order; and a chamfering processed portion 49 (chamfering punch 49a) for chamfering the fastener element 10 attached to the fastener tape 3.
In this case, the wire supplying portion, the cutting die 46, and the cutting punch 47 of the present embodiment are formed substantially in the same manner as the wire supplying portion (also referred to as a wire feeding roller or a supplying member portion), the cutting die, and the cutting punch described in patent documents 2 and 3. The operation mechanism of each part in the manufacturing apparatus 40 according to the present embodiment is also formed substantially in the same manner as the operation mechanism described in the above-described patent document 2 and patent document 3.
Here, when the cutting die 46 and the cutting punch 47 are simply described, in the manufacturing apparatus 40 of the present embodiment, the cutting die 46 and the later-described forming die 42 of the element forming portion 41 are configured to be linearly reciprocated in the front-rear direction by a not-shown driving mechanism so as to alternately advance and retreat with respect to the cutting punch 47.
In this case, the upper surface of the cutting die 46 is formed as a sliding contact surface with which the cutting punch 47 is brought into sliding contact. A wire guide hole 46a that opens on a sliding contact surface (upper surface) of the cutting die 46 and that vertically penetrates the cutting die 46 is provided in a width direction center portion of the cutting die 46. The wire guide hole 46a of the cutting die 46 is formed in the vertical direction in a shape corresponding to the cross section of the element wire 50, and the element wire 50 supplied from the wire supply portion is introduced into the wire guide hole 46a from below.
On the upper surface of the cutting die 46, a cutting punch 47 is fixedly secured to a seat portion of the manufacturing apparatus 40. Therefore, as described above, by reciprocating the cutting die 46 and the forming die 42 in the front-rear direction by the drive mechanism not shown, the fixed cutting punch 47 can alternately advance and retreat relative to the cutting die 46 and the forming die 42 while sliding in contact with the upper surface of the cutting die 46.
By providing the cutting die 46 and the cutting punch 47 as described above, as will be described later, a part (protruding part) of the element wire material 50 protruding from the upper surface of the cutting die 46 can be cut by the cutting punch 47 which is relatively advanced, whereby the element 30 shown in fig. 12 can be formed. Further, by relatively advancing the formed element 30 by the cutting punch 47, the element 30 can be smoothly fed to the forming die 42 of the element forming portion 41 located in front of the cutting die 46.
The element molding portion 41 of the present embodiment includes: a molding die 42 for placing the element 30 conveyed by the cutting punch 47 and supporting the element 30 from below; a pressing pad 43 that presses the element 30 toward the forming die 42; and a forming punch 44 that press-forms the element 30 held between the forming die 42 and the pressing pad 43.
The molding die 42 has a mounting portion 42a on which the element 30 is mounted. The placement portion 42a is disposed below the upper surface of the molding die 42. The molding die 42 has a predetermined shape that can mold the coupling head portion 11 of the fastener element 10 by pressing the temporary coupling head portion 31 of the element 30, which will be described later, in cooperation with the molding punch 44.
The forming punch 44 is fixed to a punch holding portion, not shown, above the forming die 42 on which the element 30 is placed. The forming punch 44 is configured to be vertically reciprocable by a driving mechanism, not shown, so as to be alternately lowered and raised with respect to the forming die 42 together with the punch holding portion.
A flat contact surface that contacts the first surface of the element 30 (fastener element 10) and a concave portion forming pressing portion 44a provided perpendicularly from the contact surface are provided at the lower end portion of the forming punch 44. The concave portion forming pressing portion 44a has a shape corresponding to the engagement concave portion 12 of the fastener element 10.
The press pad 43 is disposed above the molding die 42 on which the element 30 is placed, and is held by the punch holding portion so as to be movable up and down. The pressure pad 43 is urged downward by a spring member, not shown.
As shown in fig. 8, the pressure pad 43 has, at its lower end: a component fixing portion 43a that presses the tape clamping portion 16 of the fastener element 30 placed on the molding die 42 with the tip end surface; an insertion portion 43b provided vertically from the tip end surface of the element fixing portion 43a and inserted between the first leg portion 18a and the second leg portion 18b of the belt clamping portion 16; and four projecting pressing portions 43c projecting from the proximal end of the insertion portion 43 b.
In this case, the projecting pressing portion 43c projects from the outer peripheral side of the proximal end portion of the insertion portion 43b in a direction perpendicular to the vertical direction of the insertion portion 43 b. The projecting pressing portion 43c has a configuration in which a side wall surface of the projecting pressing portion 43c is inclined at a predetermined angle with respect to the vertical direction of the insertion portion 43b so that the area of a cross section orthogonal to the vertical direction of the insertion portion 43b decreases with distance from the distal end surface of the element fixing portion 43 a. In the present embodiment, the size or shape of the cutout portion 21 and the bulge portion 22 provided in the fastener element 10 can be changed by changing the size or shape of the projecting pressing portion 43c provided in the pressing pad 43.
When the press pad 43 is brought into contact with the element 30 mounted on the molding die 42, first, the insertion portion 43b of the press pad 43 is inserted between the first leg portion 18a and the second leg portion 18b of the element 30. In this case, as indicated by the phantom lines in fig. 3, a small gap is provided between the insertion portion 43b of the pressure pad 43 and the first and second leg portions 18a and 18b of the element 30, as is the position of the insertion portion 43b of the pressure pad 43 relative to the first and second leg portions 18a and 18b of the element 30.
After the insertion portion 43b of the pressure pad 43 is inserted as described above, the pressure pad 43 is further lowered, whereby the element fixing portion 43a of the pressure pad 43 presses the element 30 placed on the molding die 42 from above, and the projecting pressing portions 43c of the pressure pad 43 can press the tape clamping portion 16 of the element 30 as described below.
The element attachment portion 48 and the chamfered portion 49 in the manufacturing apparatus 40 of the present embodiment are formed substantially in the same manner as the element attachment portion (also referred to as a caulking portion) and the chamfered portion described in patent document 3.
To simplify the description, the element attaching portion 48 of the present embodiment includes a pair of right and left caulking punches 48a, and the pair of right and left caulking punches 48a press and plastically deform the first leg portion 18a and the second leg portion 18b of the fastener element 10 toward the fastener tape 3. The chamfering section 49 includes a pair of right and left chamfering punches 49a arranged above the right and left caulking punches 48 a. The chamfering processed portion 49 can chamfer the ridge line portion of the tape nipping portion 16 by pressing the tape nipping portion 16 of the fastener element 10 attached to the fastener tape 3 from the left and right sides with the chamfering punch 49 a.
Next, a method of sequentially manufacturing the fastener elements 10 shown in fig. 2 to 5 from the Y-shaped element thread material 50 using the manufacturing apparatus 40 described above and further attaching the manufactured fastener elements 10 to the fastener tape 3 will be described.
First, in order to manufacture the fastener element 10, an element wire material (Y-shaped wire material) 50 is prepared as a preparation step. The element wire 50 used in the present embodiment is formed by passing a long metal wire having a circular cross section through a plurality of press rolls and forming the wire so as to have, for example, the same cross section as the element 30 shown in fig. 12.
In the manufacturing method of the present embodiment, first, the element wire 50 is intermittently supplied to the cutting die 46 at a predetermined pitch from a wire supply portion, not shown, disposed below the cutting die 46. Thereby, as shown in fig. 9, the element wire 50 can pass through the wire guide hole 46a of the cutting die 46, and further protrude upward from the upper surface (sliding contact surface) of the cutting die 46 by the thickness of the fastener element 10. At this time, the cutting die 46 is stopped at a position advanced to the maximum extent with respect to the cutting punch 47.
In the manufacturing apparatus 40 of the present embodiment, while the fastener elements 10 are continuously manufactured from the element wire material 50, the manufactured fastener elements 10 are plastically deformed and attached to the fastener tape 3 in order. Therefore, as shown in fig. 9, the fastener element 10 manufactured from the element wire 50 one after the other has been attached to the fastener tape 3 by the caulking punch 48a in a state where the element wire 50 is caused to protrude from the upper surface (sliding contact surface) of the cutting die 46 by a predetermined thickness.
After the wire 50 is projected on the sliding contact surface of the cutting die 46, the cutting die 46 is retreated together with the wire 50 by the drive mechanism. Thereby, the cutting punch 47 moves forward relative to the cutting die 46. Therefore, the element wire 50 is cut by a predetermined thickness (projecting amount) projecting on the sliding contact surface by the cutting punch 47 and the cutting die 46 as cutting means. As a result, the element 30 having a constant thickness as shown in fig. 12 is formed.
In this case, the element 30 has a provisional engagement head 31 whose first surface (lower surface) and second surface (upper surface) are flat surfaces, and a band clip 16 extending from the provisional engagement head 31. The tape clamping surface 19 of the tape clamping portion 16 of the fastener element 30 is not formed with the cutout portion 21 and the bulge portion 22, but is formed with a ridge portion 23 extending in the thickness direction of the fastener element. The protruding portions 23 of the element 30 are formed on the element wire material 50 when the element wire material 50 is manufactured in a substantially Y-shape from the wire material 50 by rolling in the above-described preparation step.
By further retreating the cutting die 46, as shown in fig. 10, the element 30 cut out from the element wire material 50 is relatively advanced while being held by the cutting punch 47, and is guided to the position of the forming die 42 disposed in front of the cutting die 46.
Then, when the cutting die 46 is moved to the rear end position of the reciprocating motion, the element 30 that has advanced to the front end portion of the forming die 42 leaves the cutting punch 47 and falls down to the placing portion 42a of the forming die 42. Thus, the element 30 is placed on the placement portion 42a of the molding die 42 in a predetermined orientation. At this time, the upper surface of the placement portion 42a of the molding die 42 is formed in a surface shape corresponding to the engagement convex portion 13 and the chamfered portion 15 formed in the engagement head portion 11 of the fastener element 10.
Next, as shown in fig. 11, the molding punch 44 and the pressure pad 43, which are on standby above the molding die 42, are lowered together toward the element 30 placed on the molding die 42. Thus, the insertion portion 43b of the pressure pad 43 shown in fig. 8 is first inserted between the first leg portion 18a and the second leg portion 18b of the element 30, and then the tape clamping portion 16 of the element 30 is further press-formed from above by the four projecting pressing portions 43c of the pressure pad 43.
At this time, the insertion portion 43b of the pressing pad 43 is inserted into the fastener element 30 to a position separated from the belt sandwiching surface 19 of the belt sandwiching portion 16 as described above, and a small gap is formed between the insertion portion 43b of the pressing pad 43 and the belt sandwiching surface 19 of the belt sandwiching portion 16.
Next, the four projecting pressing portions 43c provided on the pressing pad 43 come into contact with the first surface of the tape nipping portion 16 of the element 30, and further, are lowered to a predetermined depth in the element thickness direction. Thereby, the tape clamping portion 16 of the element 30 is partially pressed, and four cutout portions 21 are directly formed in the tape clamping portion 16 from the first surface along the element thickness direction with a predetermined dimension.
Further, while the cutout portion 21 is formed in the tape clamping portion 16 of the element 30 by the projecting pressing portion 43c of the pressing pad 43, a portion adjacent in the element thickness direction with respect to the bottom surface 21a of the cutout portion 21 bulges out from the tape clamping surface 19 toward the tape clamping space 20 by the plastic flow of the metal portion located in the formation region of the cutout portion 21. Thereby, four bulging portions 22 corresponding to the respective cutout portions 21 are formed.
Therefore, in the present embodiment, the four cutout portions 21 and the four bulging portions 22 can be easily and stably formed in the belt clamping portion 16 by press-working the belt clamping portion 16 of the cut-out element 30 from above the element 30 in the element thickness direction by the projecting pressing portion 43c of the pressing pad 43.
Then, the press pad 43 continues to descend to a predetermined depth, and the element fixing portion 43a (tip end surface) of the press pad 43 comes into contact with the first surface of the tape clamping portion 16 of the fastener element 30. Thus, the tape clamping portion 16 of the element 30, in which the cutout portion 21 and the bulge portion 22 are formed, can be clamped and fixed between the press pad 43 and the molding die 42.
Further, as described above, the element 30 is pressed by the pressing pad 43, and the forming punch 44 is lowered, whereby the element 30 is pressed from above. Such press forming is also sometimes called mountain forming (forming into a mountain shape). The coupling concave portion 12, the coupling convex portion 13, the distal end inclined portion 14, and the chamfered portion 15 of the fastener element 10 can be stably formed by press-forming the temporary coupling head portion 31 of the element 30 by the forming punch 44.
The cutting of the wire 50 by the cutting die 46 and the cutting punch 47 and the press forming by the press pad 43 and the forming punch 44 as described above are performed in accordance with the supply timing of the wire 50 intermittently supplied from the wire supplying portion. Thus, the plurality of fastener elements 10 of the present embodiment can be continuously manufactured from the long Y-shaped wire 50.
By thus manufacturing the fastener element 10 of the present embodiment from the Y-shaped wire 50, it is possible to improve the production efficiency and reduce the manufacturing cost, compared to a case where the fastener element 10 having the same shape is manufactured by punching out from a flat plate-shaped metal plate material, for example.
In addition, in the manufacturing apparatus 40 of the present embodiment, the fastener elements 10 can be manufactured as described above, and the manufactured fastener elements 10 can be attached to the fastener tape 3 in order. In this case, the fastener tape 3 is intermittently pulled up by a predetermined length at a predetermined timing by a not-shown tape conveying section at a position separated by a predetermined distance from the stationary cutter punch 47.
As described above, the press forming by the press pad 43 and the forming punch 44 is performed when the cutting die 46 is stopped at the rear end position of the reciprocating movement (or at a position near the rear end position). Therefore, the fastener element 10 manufactured by press forming is first brought close to the fastener tape 3 in a state of being placed on the forming die 42 by advancing together the cutting die 46 and the forming die 42. At this time, the pair of caulking punches 48a of the element attaching portion 48 operate in accordance with the advance of the cutting die 46, and sandwich the first leg portion 18a and the second leg portion 18b of the fastener element 10 from the outside.
Further, by moving the cutting die 46 to the front end position of the reciprocating motion, the fastener tape 3 is inserted between the first leg portion 18a and the second leg portion 18b of the fastener element 10. Thereafter, the first leg portion 18a and the second leg portion 18b of the fastener element 10 are pressed from the outside by the pair of caulking punches 48a so as to approach each other, and are plastically deformed (caulked). Thereby, the fastener element 10 is attached (implanted) to a predetermined position of the fastener tape 3 at the front end position of the cutting die 46.
While the cutter die 46 is moved to the front end position and the fastener elements 10 are attached to the fastener tape 3 as described above, the element thread material 50 is supplied from a thread material supply portion not shown. Thereby, the element wire 50 is projected upward by the thickness of the fastener element 10 on the sliding contact surface of the cutting die 46 (i.e., returned to the state of fig. 9).
Then, by continuously repeating the series of operations described above, the plurality of fastener elements 10 are attached to the tape side edge portion of the fastener tape 3 at a predetermined attachment pitch in the tape longitudinal direction. Thereby, the fastener stringer for the slide fastener 1 is manufactured.
In the manufacturing apparatus 40 of the present embodiment, as shown in fig. 7, the pair of chamfering punches 49a of the chamfering processed portion 49 is disposed above the caulking punch 48a of the element attaching portion 48. By operating the pair of chamfering punches 49a, the fastener element 10 implanted in the fastener tape 3 can be chamfered.
The manufacturing apparatus 40 of the present embodiment has the following configuration: the fastener elements 10 are manufactured by press-forming the element elements 30 by the press pad 43 and the forming punch 44, and then the manufactured fastener elements 10 are continuously attached to the fastener tape 3. However, in the present invention, after the fastener element 10 is manufactured by press forming, for example, the manufactured fastener element 10 can be recovered without being attached to the fastener tape 3. The plurality of recovered fastener elements 10 may be subjected to a polishing step such as barreling.
In the fastener element 10 of the present embodiment manufactured as described above, the plurality of cutout portions 21 that are cut out in the element thickness direction are formed in the tape nipping portion 16. In addition, the metal material of the fastener element 10 is plastically deformed so as to flow along with the formation of the cutout portion 21, thereby forming a bulging portion 22 that bulges out from the tape clamping surface 19 toward the tape clamping space 20 by a large amount. In particular, the bulging portion 22 of the present embodiment has a form bulging more than the protruding strip portion 23 from the belt clamping surface 19 of the belt clamping portion 16 in the direction orthogonal to the fastener element thickness direction.
Therefore, by attaching the fastener element 10 of the present embodiment to the fastener tape 3, the bulging portion 22 provided in the tape nipping portion 16 is locally and strongly pressed (deeply sunk) toward the tape side edge portion (particularly, the core thread portion 3a) of the fastener tape 3. Then, the fastener tape 3 can be made to be recessed (entered) into the cut-out portion 21 provided in the tape nipping portion 16. This can effectively increase the sliding strength and the pull-off strength of the fastener element 10 with respect to the fastener tape 3.
The bulge 22 of the fastener element 10 according to the present embodiment is formed to bulge from the tape clamping surface 19 to be larger than the protrusion 23. Therefore, even when the fastener element 10 of the present embodiment is subjected to the grinding step before being attached to the fastener tape 3, for example, the bulging portion 22 can be stably retained in a state where the tape clamping portion 16 of the fastener element 10 after the grinding step bulges out from the tape clamping face 19.
In the present invention, the sizes, the arrangement positions, the arrangement numbers, and the like of the cutout portions 21 and the expanded portions 22 provided in the tape clamping portion 16 of the fastener element 10 can be arbitrarily changed by changing the shapes, the positions, the arrangement numbers, and the like of the projecting pressing portions 43c provided in the pressing pad 43 of the manufacturing apparatus 40.
In the fastener element 10 of the above embodiment, the cutout portion 21 formed from the first surface (lower surface) of the tape clamping portion 16 and the bulging portion 22 corresponding to the cutout portion 21 are formed. However, in the present invention, for example, the same insertion portion and protruding pressing portion as the insertion portion 43b and protruding pressing portion 43c provided on the pressure pad 43 in the above-described embodiment may be provided on the mounting portion 42a of the molding die 42 of the manufacturing apparatus 40. Thus, a fastener element can be manufactured in which a cutout 21 cut out from a first surface (lower surface) and a corresponding bulge 22 are formed in the tape clamping portion 16, and a cutout cut out from a second surface (upper surface) opposite to the first surface and a corresponding bulge are formed (or formed instead of).
Description of the reference numerals
1 zipper
2a first fastener stringer
2b second fastener stringer
3 zipper tape
3a core rope portion
4 first stop code
5 second stop
6 puller
7 element row
7a first element row
7b second element row
10 Metal slide fastener element (Metal element)
11 engaging head
12 engaging recess
13 engaging projection
14 tip inclined part
15 chamfer part
16-belt clamping part
17 crotch part
18a first leg portion
18b second leg
19 belt clamping surface
20 clamping space
21 cut part
21a bottom surface
21b side wall surface
21c inner end face (inner end face)
22 bulge part
22a top end face
23 protruding strip part
30 fastener element
31 temporarily engaging the head
40 manufacturing device
41 element forming part
42 forming die
42a placing part
43 pressure pad
43a element fixing part
43b insertion part
43c convex pressing part
44 forming punch
Part 44a forms a pressing part
46 cutting die
46a wire guide hole
47 cutting punch
48 element mounting part
48a riveting punch
49 chamfer processing part
49a chamfering punch
50 wire (Y-shaped wire)

Claims (10)

1. A metal-made fastener element (10) for a slide fastener (1), the metal-made fastener element (10) having a coupling head (11) and a tape clamping portion (16) extending from the coupling head (11), a coupling concave portion (12) being provided in a concave manner on a first surface of the coupling head (11), a coupling convex portion (13) being provided in a convex manner on a second surface of the coupling head (11), the tape clamping portion (16) having a crotch portion (17) extending from the coupling head (11), and a pair of first leg portions (18a) and second leg portions (18b) branching from the crotch portion (17) and further extending, a tape clamping surface (19) being continuously formed from the first leg portion (18a) to the second leg portion (18b) via the crotch portion (17), the fastener element (10) being characterized in that,
the belt clamping portion (16) has: at least one cutout (21) that is recessed from at least one of the first surface and the second surface of the tape clamping portion (16) in the thickness direction of the fastener element and that opens at the tape clamping surface (19); and a bulging portion (22) bulging from the tape nipping surface (19) adjacent to a bottom surface (21a) of the cutout portion (21) in the element thickness direction.
2. The fastener element according to claim 1,
the bottom surface (21a) of the cutout portion (21) and the distal end surface (22a) of the bulging portion (22) are formed as a continuous surface.
3. The fastener element according to claim 1 or 2,
the cutout portion (21) is formed in such a shape that a spatial cross section orthogonal to the thickness direction of the element gradually decreases toward the bottom surface (21a) of the cutout portion (21).
4. The fastener element according to claim 1 or 2,
the plurality of cutout portions (21) and the plurality of bulge portions (22) are formed symmetrically with respect to a center plane in the fastener element width direction.
5. The fastener element according to claim 1 or 2,
the tape clamping portion (16) has a protruding strip portion (23) that protrudes continuously in the fastener element thickness direction on the tape clamping surface (19).
6. The fastener element according to claim 1 or 2,
the cutout portion (21) is recessed from the first surface of the band clamp portion (16).
7. A manufacturing apparatus (40) for a fastener element, comprising: a wire material supply unit that intermittently supplies a wire material (50) for a fastener element having a substantially Y-shaped cross section at a predetermined pitch in the longitudinal direction; a cutting punch (47) that cuts the element wire (50) to a predetermined thickness to form an element (30) having a provisional engagement head (31) and a tape clamping portion (16) extending from the provisional engagement head (31); and an element forming part (41) that press-forms the temporary coupling head part (31) of the element (30), forms a coupling concave part (12) on a first surface of the temporary coupling head part (31), and forms a coupling convex part (13) on a second surface of the temporary coupling head part (31), the apparatus (40) for manufacturing a fastener element being characterized in that,
the element forming portion (41) has a protruding pressing portion (43c) which forms a cutout portion (21) provided recessed in the tape clamping portion (16) by locally pressing and plastically deforming the tape clamping portion (16) of the element (30) from a first surface in the element thickness direction, and a bulging portion (22) bulging adjacent to a bottom surface (21a) of the cutout portion (21) in the element thickness direction by plastic flow generated along with the formation of the cutout portion (21).
8. The manufacturing apparatus according to claim 7,
the element molding part (41) has: a molding die (42) on which the element (30) is placed; a pressing pad (43) which is arranged to be able to be lifted relative to the molding die (42) and presses the tape clamping section (16) of the element (30) toward the molding die (42); and a forming punch (44) which is disposed so as to be able to be raised and lowered with respect to the forming die (42) and which performs the press forming of the temporarily engaging head portion (31) of the element (30) held between the forming die (42) and the pressure pad (43),
the pressure pad (43) is provided with: an element fixing portion (43a) that presses the tape clamping portion (16) of the fastener element (30) with a tip end surface; and an insertion portion (43b) provided perpendicularly to the distal end surface of the element fixing portion (43a) and inserted between the first leg portion (18a) and the second leg portion (18b) of the tape holding portion (16),
the protruding pressing portion (43c) is provided protruding from the outer peripheral side surface of the insertion portion (43b) at the proximal end portion of the insertion portion (43b) of the pressure pad (43).
9. The manufacturing apparatus according to claim 8,
the protruding pressing portion (43c) of the pressing pad (43) has a configuration in which the area of a cross section orthogonal to the vertical direction of the insertion portion (43b) decreases with distance from the distal end surface of the element fixing portion (43 a).
10. A method of manufacturing a fastener element, comprising: cutting a wire material (50) for a fastener element having a substantially Y-shaped cross section at a predetermined thickness to form a fastener element (30) having a provisional engagement head (31) and a tape clamping portion (16) extending from the provisional engagement head (31); and a step of press-forming the provisional engagement head (31) of the fastener element (30), wherein an engagement concave portion (12) is formed on a first surface of the provisional engagement head (31), and an engagement convex portion (13) is formed on a second surface of the provisional engagement head (31),
the method comprises the following steps: when the tape clamping portion (16) of the element (30) is pressed in the press-forming of the temporary engagement head (31), the tape clamping portion (16) of the element (30) is pressed locally from a first surface in the element thickness direction and is plastically deformed, thereby forming a cutout portion (21) that is concavely provided in the tape clamping portion (16) and simultaneously forming a bulging portion (22) that bulges out adjacent to a bottom surface (21a) of the cutout portion (21) in the element thickness direction by plastic flow generated along with the formation of the cutout portion (21).
CN201680084671.8A 2016-05-06 2016-05-06 Fastener element, device for manufacturing fastener element, and method for manufacturing fastener element Active CN109068814B (en)

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WO2017191688A1 (en) 2017-11-09
EP3453276A4 (en) 2019-10-30
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CN109068814A (en) 2018-12-21
JP6833829B2 (en) 2021-02-24
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JPWO2017191688A1 (en) 2018-11-08
EP3453276B1 (en) 2020-10-28

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