GB2067452A - Apparatus for attaching pronged fastener elements of garment waistband fastener devices - Google Patents

Apparatus for attaching pronged fastener elements of garment waistband fastener devices Download PDF

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Publication number
GB2067452A
GB2067452A GB8001027A GB8001027A GB2067452A GB 2067452 A GB2067452 A GB 2067452A GB 8001027 A GB8001027 A GB 8001027A GB 8001027 A GB8001027 A GB 8001027A GB 2067452 A GB2067452 A GB 2067452A
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United Kingdom
Prior art keywords
mandrel
clenching
bar
plate element
dies
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Granted
Application number
GB8001027A
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GB2067452B (en
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Thomas Walker Ltd
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Thomas Walker Ltd
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    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41HAPPLIANCES OR METHODS FOR MAKING CLOTHES, e.g. FOR DRESS-MAKING OR FOR TAILORING, NOT OTHERWISE PROVIDED FOR
    • A41H37/00Machines, appliances or methods for setting fastener-elements on garments
    • A41H37/02Setting hooks or eyes

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

A mandrel of a clenching press for attaching pronged clothing fasteners to garment waistbands comprises an elongate bar 30 having in its top face 34 a groove formation 36 providing anvil surfaces of clenching dies for clenching the attachment prongs of the fasteners. A plate 38 having fastener back plate receiving apertures 44 is detachably fixed to the bar 30 by screws 40. Thereby, the plate 38 can be replaced by a substitute plate having a similar back plate receiving aperture or apertures in a different relative position or positions bringing into use a different portion of the groove formation 42 to provide the anvil surfaces. A number of different fixing holes 42 may also be provided to enable the same plate 38 to be refitted in a different position. The arrangement enables pairs of fasteners to be fixed simultaneously in differently spaced positions, or in different positions along the length of the bar which avoid worn portions of tile groove formation, without need to replace the whole mandrel. <IMAGE>

Description

SPECIFICATION Apparatus for attaching pronged fastener elements of garment waistband fastener devices This invention relates to apparatus for use in attaching pronged fastener elements of garment waistband fastener devices during the manufacture of garments such as trousers and skirts.
More particularly, the invention is concerned with a mandrel component of a clenching press for use in attaching pronged fastener elements provided with associated back-plates to garment waistbands made up, or partially made up, into closed ended pockets or sleeves.
Garment waistband fastener devices, for example hook-and-eye waistband fastener devices, commonly comprise separate sheet-metal fastener elements each having a plurality of integral prongs disposed in spaced parallel relationship which are used to attach the fastener element to the garment material in co-operation with an associated backing member or back-plate. In an attachment operation, each fastener element is generally supported and held in a workholdertool mounted in a clenching machine or press which is operated to cause the prongs of the element to penetrate through a thickness of the garment material and to engage with anvil surfaces in a clenching die so as to be bent over or clenched by impact into clamping relationship with the respective back-plate which is positioned on the underside of the garment material.The workholdex tool is generally mounted on an upper carrier part of the clenching press above the clenching die and the attachment operation is effected when operating the press by bringing about relative vertical movementofthe respectiveworkholdertool and clenching die towards and away from one another.
Such clenching dies are also usually designed to support the back-plate components and to locate them with respect to the anvil surfaces, and for attaching the fastener elements to waistbands which are already made up, or partially made up, into a closed ended pocket or sleeve such clenching dies are commonly carried by an arm of a mandrel component of the clenching press, generally of cantilever form, which can be inserted into the pocket or sleeve of the waistbands as for example described in U.K.
Patent Specification No. 788480. Some clenching presses and mandrel components thereof are also designed for fixing a pair of fastener elements, for example hook or eye elements, simultaneously in predetermined spaced apart relationship, being provided with spaced pairs of workholder tools and of clenching diesforthis purpose.
Heretofore, the clenching dies carried by such mandrels have usually been provided by a recess formed in a solid metal body part of the mandrel, this recess being shaped to provide integral anvil surfaces and to accommodate and locate therein a respective back-plate. Although this arrangement is functionally satisfactory, in the event of wear taking place in the anvil surfaces or if there is a need to vary the position of a clenching die on the mandrel, for example to suit a different waistband, it has generally been necessary to replace the entire mandrel and this can be relatively costly and inconvenient.In particular, this need for replacement of the entire mandrel has in the past arisen quite frequently where the mandrel carries a spaced apart pair of clenching dies for the simultaneous attachment of a pair of fastener elements since there is often a need to vary the spacing between the clenching dies due to the fact the several standard lengths of waistband extensions, each requiring a different spacing between a pair of fastener elements attached thereto, are used in the clothing industry; in consequence, in these circumstances clothing manufacturers have often had to be supplied with a set of mandrels each with a different spacing of clenching dies for each clenching press.
An object of the present inve ion is to provide a more versatile form of mandrel whereby at least some of the disadvantages of the prior art mandrels referred to can be reduced or obviated.
Broadly, according to the invention, in a mandrel component of a clenching press for use in attaching pronged fastener elements provided with associated back-plates to garment waistbands made up, or partially made up, into closed ended pockets or sleeves, wherein said mandrel comprises an elongate bar forming an arm which can be inserted into the closed ended pocket or sleeve of a said waistband and which carries at least one clenching die designed to support and locate the back-plate of said fastener element and including anvil surfaces for impact engagement with the prongs of said fastener element effective to clench said prongs against the back-plate during an attachment operation, said clenching die has its anvil surfaces provided by a longitudinally extending groove formation in the top face of said bar and has means for positioning said fastener backplate provided by a plate element formed with a back-plate receiving aperture therein matching the shape of the back-plate and overlying the top face of the bar and said groove formation, and said plate element is detachably fixed to said bar such that it can be replaced by a substituted plate element having a similar back-plate receiving aperture in a different relative position or alternatively can be refitted on the bar in a different position with, in either case, a different portion of said groove formation being brought into use to provide said clenching die anvil surfaces.
Thus, merely by replacing or refitting the plate elementthe mandrel can be modified by the userto meet the effects of wear of the anvil surfaces or to meet requirements for attaching fastener elements in a different position.
As previously indicated, the invention is especially useful when applied to mandrels which are required for the simultaneous attachment of a pair of fastener elements where the spacing of the fastener elements, and thus the spacing of the clenching dies, may need to be be varied.
In this case, where the mandrel carries a pair of clenching dies, one for each fastener element, in predetermined spaced apart positions suitable for attaching the fastener elements in their required positions, at least one of the clenching dies, generally that furthest from the free end of the mandrel arm, will have its anvil surfaces provided byt;.s groove for mation in the barofthe mandrel an-- and will have means for locating or positioning a back-plate provided by an apertured plate element detachably fixed to the said bar in accordance with the invention.The other clenching die may be of a conventional type formed by a recess containing a discrete set of anvil surfaces ir, the barofthe mandrel, but in preferred embodiments both clenching dies will have their anvil surfaces provided by longii:udinally extending grooves in the top face of said bar and brth will include an aperture in an overlying plate elem -n^ or elements for receiving and locating or posi-;ioning the respective back-plates of the two fas tending elements.
Conveniently, in some preferred embodiments for attaching a pair of spaced fastener elements, the groove formation in the top face of the mandrel bar comprises parallel continuous grooves extending along the length of the bar for a distance sufficient for the same grooves to provide the anvil surfaces of both dies, and the back-plate receiving apertures of both dies are ,orovicSeci by a single common plate element Separate apertured plate elements may, hovjever be jrovided, if desirss, of which one or both may be rr,sdily r-.pl2zeable or adjustable in position.
For cietachably fi ing the apertured plate element er elements to the mar,drei. bar, screw fixing means are preferably provided. replacement and fitting of a substitute plate @@ement having its back-plate receiving aperture or apertures in different relative positions can then be earned out using the same screw holes as are used for the original plate element, but for a positional adjustment of a plate element by refitting it in a different position a numberofdiffer- ent fixing holes in the mandrel bar may be provided which can be chosen or selected as required.
By way of example, embodiments of the invention will be more particularly described with reference to the accompanying illustrative drawings.
In said drawings, Figure 1 is a perspective view showing a typical sheet-metai hock fastener element and associated back-plate of a hook-and-eye garment waistband fastener device for the attachment of which the apparatus of the present invention is especially suitable; Figure 2 is a plan view of a mandrel component of a clenching press for attaching a pair of the hook fastener elements of Figure 1 to a garment waistband, including an apertured plate element and constructed in accordance with a first embodiment of the invention; Figure 3 is a side elevational view of the mandrel of Figure 2; Figure 4 is a longitudinal sectional view, on a larger scale, taken along line IV-IV of Figure 2;; Figure 5 is a transverse sectional view, also on a larger scale, taken along line V-V of Figure 2; Figure 6 is a similar view to Figure 5 but showing a back-plate of the hook fastener element in position; Figure 7 is an exploded perspective view of the outer end portion of the mandrel of Figure 2; Figure 8 is a view similarto Figure 2 but shc @@g the mandrel fitted with a substitute plate element 'ror attaching the hook fastener elements in a different spaced relationship; Figure 9 is a plan view of a modified form of mandrel and substitute replacement plato element in accordance with a second embodiment; and Figure 10 is a plan view of another modified form of mandrel with one fixed plate element and one selectively adjustable plate element in accordance with a third embodiment Referring to the drawings, the hook fastener ele ment 10 and associated back-plate 12 shown in Fig tire 1 represent components of a hook-and-eye garment waistband fastener device of a kind widely used in the clothing industry.
The hook element 10 has crush-resistant cranked form comprising a cantilever hook tongue 14 which is elevated and longitudinally offset with respect to a relatively short base 16 to which the root end of the hook tongus is integrally connected by a shallow cranked or step formation 12, the base 16 being provided along each opposite side edge with a pair of integral pointed attachment prongs 2Q, 20, which ini- ~ tially are bent so as to extend perjendicularly to the plane of the base The associated back-plate 12 is of elongate form R ilD a pair of laterally spaced apertures 22, 22, towards one end to receive the parallel spaced pairs of hook prongs 20, 20, which are bent over or clenched in fixing and attaching the hook element to garment material so as to seat in a pair of grooves or channels 24,24, extending transversely of the back-plate between the apertures 22, 22. When fixed, the other end of the back-plate extends beneath the hook tongue 14 on the opposite side of the garment material.
In the embodiment illustrated in Figures 2 to 7, the mandrel comprises an elongate solid metal flat bar 30 having towards its inner end a bearing hole 32 for receiving a mounting pin or shaft of a pivot mounting (not shown) whereby it can be fitted in known manner in a clenching press to provide an angularly movable arm of cantilever form of which the outer free end portion is insertable into a garment waistband made up, or partially made up, into a closed ended pocket or sleeve.
Extending longitudinally from the outer end the flat tep face 34 of the bar 30 has milled therein 3 groove formation 36 comprising a pair of parallel side-by-side continuous grooves 36a and 36b of shallow concave cross-sectional profile.
The outer end portion of the bar 30 also carries a rectangular flat plate element 38 detachably fixed thereto by a pair of screws 40 engaged in screwholes 41 and 42 so as to overlie the top face 34 and groove formation 36. The plate element 38 is somewhat wider than the bar30, the width being matched to the internal width of the waistband pocket or sleeve into which the mandrel is designed to be in serted, and as shown has smooth rounded corners of which those at the outermost end facilitate insertion into the waistband. The outermost end edge 43 lies substantially flush with the end of the bar 30.
It will be seen that the plate element 38 is formed with a pair of spaced apart apertures 44, 44, which each match the shape of the back-plates 12 provided for the hook elements 10 and which each expose a portion of the top face 34 and of the groove formation 36 to define a recessed clenching die D adapted to receive and locate or position a said back-plate 12.
In each clenching die D thus formed, as shown most clearly in Figure 6, the back-plate seats and is supported on the exposed portion of the top face 34 of the bar and the underlying exposed portion of the concave grooves 36a and 36b provide anvil surfaces arranged to engage and clench the prongs 20,20, or a hook element 10 during an attachment operation.
The apertures 44, 44, are positioned and spaced apart in the plate element 38 so as to provide the required relative positioning and spacing of the clenching dies corresponding to that of the pair of hook fastener elements 10 in relation to the particularwaistband concerned.
If it is necessary to alterthe positioning and/or spacing of the clenching dies Dto suit a different positioning or the hook fastener elements for another waistband, the plate element 38 can readily be removed by undoing the screws 40 and can then be replaced by fitting a substitute plate element having similar back-plate receiving apertures in different relative positions as shown in Figure 8 where a substitute plate element is shown, designated by the reference 38', fitted to the bar 30.
It will be appreciated that a change by this means in the position of a back-plate receiving aperture relative to the bar 30 brings into use a different portion of the grooves 36b, of the groove formation 36 to provide the associated clenching die anvil surfaces.
If it is merely required to bring a different portion of the grooves 36a, 36b into use to provide fresh anvil surfaces for the purposes of compensating for wear, without changing the spacing between the clenching dies, the plate element and mandrel bar may be formed with alternative screw holes for the fixing screws 40 in slightly different relative positions, as shown in broken lines at 41' and 42' in Figure 8, which enables the plate element to be refitted in a closely adjacent new position on the bar 30.
The grooved portion of the mandrel bar 30 will of course be subjected to a hardening process in manufacture and could, if desired, be provided in a separate insert plate or strip let into or fitted, replaceably if required, in a suitable slot or recess in the body of the bar 30. Also, although it is convenient for the groove formation 36 to be provided as shown by the channels 36a and 36b extending continuously along the length of the bar 30 for a distance at least as great as the maximum distance required between the pair of clenching dies so that the same grooves are common to both dies, if desired the groove formation could be embodied in two separate grooved sections each comprising grooves extending longitudinally for a shorter distance sufficient merely to accommodate the maximum alterations in position of the clenching dies which are likely to be required.
Since any change in spacing of the clenching dies will generally be produced by altering only the position of the innermost die of the pair, for this purpose the longitudinally extending groove formation could moreover be provided as a relatively short grooved section covering only the region in which the innermost die is likely to be situated, and the anvil surfaces ofthe outermost die could be provided by relatively narrow surfaces of conventional form covering only a very limited localised area.Alternatively, where it is required to alterthe position of the innermost die only, as shown in Figure 9 a groove formation 36 may still be used for providing the anvil surfaces of both clenching dies but the plate element may be formed in two separate parts, 38a and 38b, each independently fixed to the bar30 by screws 40a and 40b so that only the one part 38b need be replaced by a substitute element, such as that shown at 38'b, to alter the spacing.
Or again, as shown in Figure 10, the plate element may be formed in two separate parts 38c and 38d of which the part 3 & providing the outermost clenching die normally remains permanently fixed in its original position on the bar 30 by screws 40c and the other part 38d providing the innermost clenching die is arranged so that it alone can be moved and refitted in a different position. As indicated, the movable part 38d is detachably fixed by screw 40d and may conveniently be accommodated within a slotted portion 50 of the fixed part 3 & so that the overall profile of the mandrel remains unaltered when the part 38d is refitted in a different position using a different selected screw hole 42d provided in the bar 30 for engaging the fixing screw 40d.
Although the specific embodiments of the invention have been described specifically in relation to a pronged hook fastener element and back-plate, it will of course be appreciated that the invention is equally applicable to mandrels designed for attaching pronged eye or staple fastener elements and back-plates, and also many modifications in precise structural details are possible within the scope of the invention.

Claims (10)

1. A mandrel component of a clenching press, for use in attaching pronged fastener elements provided with associated back plates to garment waistbands made up or partially made up into closed ended pockets or sleeves, comprising an elongate bar forming an arm which can be inserted into the closed ended pocket or sleeve of a said waistband and which carries at least one clenching die designed to support and locate the backplate of a said fastener element and including anvil surfaces for impact engagement with the prongs of said fastener element effective to clench said prongs against the backplate during an attachment operation, wherein said clenching die has its anvil surfaces provided by a longitudinally extending groove formation in the top face of said bar and has means for positioning said fastener backplate provided by a plate element formed with a backplate receiving aperture therein matching the shape of the backplate and overlying the top face of the bar and said groove formation, sand plate element being detachably fixed to said bar such that it can be replaced by a substitute plate element having a similar backplate receiving aperture in a different relative position or alternatively can be refitted on the bar in a different position with, in either case, a dif fervent portion of said groove formation being brought into use to provide said clenching die anvil surfaces.
2. A mandrel as claimed in Claim ;, wherein said clenching die is one of two clenching dies, one for each of two fastener elements, provided in pre determined spaced apart positions on said mandrel for attaching a pair of said fastener elements in cor responding predetermined spaced apart positions on a garment waistband.
3. A mandrel as claimed in Claim 2, wherein anvil surfaces of both clenching dies are provided by longitudinally extending grooves in the top face of the bar of the mandrel and both clenching dies include an aperture in an overlying plate element or elements for receiving and locating or positioning the respective back plates of the two fastening elements.
4. A mandrel as claimed in Claim 2 or3, wherein the groove formation in the top face of the mandrel bar comprises parallel continuous grooves extending along the length of the bar for a distance sufficientforthe same grooves to provide the anvil surfaces of both dies, and the backplate receiving apertures of both dies are provided by a single common plate element.
5. A mandrel as claimed in Claim 4 wherein the backplate receiving apertures of both dies are provided by a common plate element.
6. A mandrel as claimed in Claim 4 wherein the backplate receiving apertures of the two dies are provided by separate plate elements.
7. A mandrel as claimed in Claim 6 wherein one of said plate elements fornis an inner plate element accommodated within an elongate slot of the other plate element which forms an outer plate element having a greater length and breadth than said inner plate element, and wherein said inner plate element is adjustable lengthwise within said slot.
8. A mandrel as claimed in any of the preceding claims, wherein the or each said apertured plate element of the clenching die or dies is fixed to the mandrel bar by screw fixing means permitting replacement and fitting of a substitute plate elernent having its backplate receiving aperture or apertures in a different position along the length of the man drel bar.
9. A mandrel as claimed in Claim 8 wherein the mandrel bar has a number of different fixing holes for the screw fixing means which can be selected as required so as to provide for positional adjustment of the our a said plate element.
10. A mandrel component of a clenching press for use in attaching pronged fastener elements provided with associated back plates to garment waistbands made up or partially made up into closed ended pockets or sleeves, said mandrel component being constructed substantially as herein described and illustrated with reference to Figures 2 to 8, or modified as herein described and illustrated with reference to Figure9 orwith referenceto Figure 10 of the accompanying drawings.
GB8001027A 1980-01-11 1980-01-11 Apparatus for attaching pronged fastener elements of garment waistband fastener devices Expired GB2067452B (en)

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GB8001027A GB2067452B (en) 1980-01-11 1980-01-11 Apparatus for attaching pronged fastener elements of garment waistband fastener devices

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Application Number Priority Date Filing Date Title
GB8001027A GB2067452B (en) 1980-01-11 1980-01-11 Apparatus for attaching pronged fastener elements of garment waistband fastener devices

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GB2067452B GB2067452B (en) 1983-06-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0436376A1 (en) * 1989-12-26 1991-07-10 Ykk Corporation Backing plate retainer
US5131639A (en) * 1989-12-25 1992-07-21 Yoshida Kogyo K.K. Backing plate retainer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131639A (en) * 1989-12-25 1992-07-21 Yoshida Kogyo K.K. Backing plate retainer
EP0436376A1 (en) * 1989-12-26 1991-07-10 Ykk Corporation Backing plate retainer

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Publication number Publication date
GB2067452B (en) 1983-06-02

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