Claims
- 1. A process for producing a slide fastener comprising the steps of:
- forming successive sheds of a pair of parallel groups of warp threads;
- laying a pair of synthetic-resin monofilaments into the respective sheds of said groups from opposite sides thereof as respective double wefts bending said monofilaments alternately around a common mandrel to form interlocking eyes between said groups of warp threads; and
- beating up the double wefts formed by said synthetic-resin monofilaments to constitute thereof mutually abutting pairs of shanks extending from each eye and forming coupling elements therewith whereby each pair of shanks is tightly held in a pocket of the warp threads extending transversely thereof.
- 2. In a method of making a slide fastener which comprises the steps of:
- (a) rolling a circular cross-section synthetic-resin monofilament to impart an ellipsoidal configuration to the resulting rolled strand;
- (b) buckling said strand to form a coupling head and a coupling eye with the major axis of the cross-section of said strand in the region of said eye extending in the longitudinal direction of the slide fastener;
- (c) twisting the strand through 90.degree. laying down a shank connected to said eye;
- (d) bending said strand to form a bight with the major axis of the cross-section of said strand in the region of said bight being perpendicular to said plane;
- (e) twisting said strand through 90.degree. and depositing another shank running away from said bight;
- (f) repeating steps (b)-(e) to form a succession of coupling elements from said strand; and
- (g) thermofixing said coupling elements.
- 3. The improvement defined in claim 2 wherein said monofilament is rolled cold.
- 4. The improvement defined in claim 3 wherein the major and minor axes of the cross-section of the strand are modified from 10 to 25% during thermofixing.
- 5. The improvement defined in claim 2 wherein the thermofixing is carried out by the application of heat.
- 6. The improvement defined in claim 2 wherein the thermofixing is carried out by the application of ultrasonic energy.
- 7. The improvement defined in claim 2 wherein said strand is a stretched polyester or polyamide filament having a stretch ratio of 1:3.5 to 1:5.
- 8. The improvement defined in claim 2 wherein said shanks are laid down as a weft of a tape-like unit and are interwoven with warp threads in respective warp sheds.
- 9. The improvement defined in claim 2, further comprising the step of looping a weft thread around the strand during the formation of coupling elements thereby.
- 10. A loom for producing a slide fastener, comprising:
- heddle means for forming a shed of a group of textile warp threads;
- a forming mandrel along one side of said group of warp threads;
- a weft needle swingable into and out of the sheds from the opposite side of said group for looping a synthetic-resin monofilament around said mandrel and depositing said monofilament as a double weft all across said group in each shed;
- means for beating up the weft formed by said monofilament;
- means for raising and lowering said mandrel to enable said monofilament to be passed therearound;
- another group of warp threads disposed parallel to the first-mentioned group whereby said mandrel lies between said groups; and
- a further weft needle for laying in another synthetic-resin monofilament and passing same around said mandrel alternately with the loops of the first-mentioned monofilament formed therearound.
- 11. The loom defined in claim 10 wherein said means for raising and lowering said mandrel comprises a mandrel holder, plunger means engageable with said mandrel holder from above and below, and means for releasable retaining said holder in upper and lower positions.
- 12. The loom defined in claim 11 wherein said retaining means comprises magnets.
- 13. The loom defined in claim 10, further comprising thermofixing means at said mandrel for thermofixing said coupling elements.
- 14. The loom defined in claim 10, further comprising means for alternately forming direct bights interconnecting each coupling head with one of the coupling heads adjacent thereto without intervening shanks and remote bights interconnecting respective heads with shanks spanning a plurality of said warp threads.
Priority Claims (3)
Number |
Date |
Country |
Kind |
2540190 |
Sep 1975 |
DEX |
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2540238 |
Sep 1975 |
DEX |
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2540272 |
Sep 1975 |
DEX |
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CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation in part of my commonly assigned copending applications Ser. No. 722,265 (U.S. Pat. No. 4,098,229) and Ser. No. 722,339 (U.S. Pat. No. 4,078,585) and also discloses subject matter which was contributed by me to applications Ser. No. 722,048 (U.S. Pat. No. 4,099,302) and Ser. No. 722,047 (U.S. Pat. No. 4,084,297), all filed Sept. 10, 1976. This application also relates to Ser. No. 755,592 which was filed Dec. 30, 1976 as a division of Ser. No. 722,339 (U.S. Pat. 4,078,585).
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1022981 |
Jan 1958 |
DEX |
Related Publications (1)
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Number |
Date |
Country |
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722239 |
Sep 1976 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
722265 |
Sep 1976 |
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