Warp-knit slide-fastener support tape and method of making same
AssigneeOptilon W. Erich Heilmann GmbH
InventorHelmut Heimberger
Life of this patent
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Abstract
A slide-fastener support tape is made in a warp-knitting machine which chains a plurality of relatively thin warp yarns to form an array of longitudinally extending and transversely spaced wales. One of the needles of the knitting machine is left empty so as to space the edgemost warp yarn from the other warp yarns by a gap corresponding to the transverse width of one wale. A relatively thick warp yarn is blind-lapped into this gap. A group of first weft yarns is laid into the warp yarns to one side of the thick yarn and a group of second weft yarns is lapped into the warp yarns with loop formations to the other side of the thick yarn. It is also possible to provide a second such thick yarn in the tape, held in place by a group of third weft yarns which are also lapped into the tape.
Claims24
A slide-fastener support tape comprising:
- a plurality of relatively thin warp yarns forming an array of longitudinally extending and transversely spaced wales defining respective warp pillars;
- a group of first weft yarns crossing said warp yarns and each extending transversely over a plurality of wales;
- a group of second yarns lapped into and forming loops from course to course in said warp yarns and each extending over a plurality of said wales, said yarns forming a ground knit omitting a warp pillar immediately from a wale;
- at an edge of the tape;
- and
- a relatively thick laid-in warp yarn extending parallel to said wales between the wale at the edge of said array and the adjacent wale at the location of the omitted warp pillar and between said first weft yarns on one side and said second yarns on the other side.
A method of making a slide-fastener support tape comprising the steps of:
- chaining a plurality of relatively thin warp yarns to form an array of longitudinally extending and transversely spaced wales;
- spacing the edgemost warp yarn from the other warp yarns by a gap corresponding to the transverse width of one wale;
- blind-lapping a relatively thick warp yarn in said gap;
- inserting a group of first weft yarns each extending over a plurality of said wales into said warp yarns to one side of said thick yarn;
- and
- inserting a group of second yarns each extending over a plurality of said wales into said warp yarns to the other side of said thick yarn.
A slide-fastener stringer half comprising a knit tape formed with a multiplicity of warp chains including an edge warp chain along a coupling edge of the tape and spaced by the width of a warp chain from the next warp chain of the tape, a weft interconnecting said warp chains, and at least one stationary thread thicker than the yarns of said warp chains and said weft lying between said edge warp chain and said next warp chain, said weft including binding threads extending back and forth between said edge and next warp chains above and below said stationary thread and retaining same, said binding threads and stationary thread forming a bead along said coupling edge of the tape, and coupling members spaced along said coupling edge and straddling said bead, said binding threads having loops interknit with said edge and next warp chains.
Dependencies are inferred from the claim text.