FI57051C - DRAGKED - Google Patents

Description

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Patent- och regiiterstyretMn 'Anrtku utligd oeh utl. «KrMtun publicund 29.02.80 (32) (33) (31) Privilege claimed — Begird priorket 13 * 10.71 13.10.71 Federal Republic of Germany-Förbunds-republiken Tyskland (DE) P 2150999-9 , P 215IOOO.9 Proof-Styrkt (71) Opti Patent-, Forschungs- und Fabrikations-AG, Burgstrasse 24, Glarus,

Sveit si-Schwei z (CH) (72) Alfons Fröhlich, Essen, Federal Republic of Germany Förbundsrepubliken Tyskland (DE) (74) Oy Kolster Ab (54) Zipper - Dragked

The invention relates to a zipper, which is a continuous barrier member rows of a synthetic monofilament, the support strip and siepparilankasilmukoista and neulalankasilmukoista formed by sewing a seam attachment between the barrier element rows, and the support strips, wherein ompelulankasilmukat surrounded by the enclosing members branches and on the barrier means the legs or support strips sewing seam in the closed OF PROCEDURE each stitch arranged in parallel at least three looper thread loops of the arc, and wherein at least the catcher yarn loops are monofilament thread.

In the manufacture of zippers, monofilament sewing threads (single threads) are increasingly used for sewing seam fastening between rows of closures and support straps due to their high tensile strength. In this case, however, a problem arises that, due to the considerable high bending stiffness of the monofilament sewing thread, it is certainly not possible to achieve such an attachment of the rows of closure members to the support strips which would certainly not move laterally.

To solve this problem, it is known in this type of zipper (BE patent publication 7 03 951) to obtain this secure fastening by fusing the monofilament sewing threads with each other and with the closure members. This has the disadvantage of 2 57051 in that, for this purpose, extremely critical working conditions must be observed with extreme precision during defrosting. Deviations from the required temperature, time, or property of the material will inevitably result in damage to the rows of closure members or complete melting of the monofilament sewing threads. In this known structure, there is a danger of producing a considerable amount of substandard goods.

In a zipper not belonging to this type (DT publication 12 69 Ö33), it is known to perform a double warp crochet seam with conventional textile yarns consisting of several yarns braided from thin fibers. This measure is not applicable to monofilament sewing threads with significant bending stiffness. In monofilament sewing threads, which are fitted to the sewing seam with radii of curvature in the order of magnitude of the diameter of the thread, considerably high stresses occur in the cross section of the thread. These lead to plastic changes at bends, which in the long run result in breaks in the thread and thus in the unusability of the zipper, especially when the tension seam fastening is also subject to considerable tensile stresses. In addition, deformations of monofilament sewing threads at their bends due to aging phenomena, e.g. slipping, would not guarantee a durable joint with a certain tightness. OF

In the manufacture of zippers, it is known per se (DT application 18 08 358) to first heat-treat the zipper components (support strips, closure rows and sewing threads), sew them together and then carry out a new heat treatment at a temperature close to at least one thermoplastic . This results in thermal bonding not only of the monofilament sewing threads but of several zipper components. This results in changes that cannot be controlled because the different components of the zipper behave differently, thus in no way taking into account the problem characteristic of monofilament sewing thread that its load capacity in curves is limited. Thread breaks at bends and thus premature breakage of the zipper cannot be ruled out.

The object of the invention is to further develop a zipper belonging to this type so that an accurate and durable sewing seam fastening between the rows of closure members and the support straps is guaranteed.

This object is solved according to the invention in that the catcher loops have a radius of curvature at all bends corresponding to at least twice the diameter of the needle thread, and that the monofilament threads are stretched by thermal fastening. The determination of the radii of curvature of the catching wire loops according to the invention can then of course be achieved by selecting the wire strengths accordingly and placing the loops in a suitable manner in the machine, and in particular 57051 so that the radius remains the same even when the wire is properly tensioned. The advantage achieved must be seen above all in that the secure connection of the rows of closure members to the support straps is guaranteed thanks to the zipper structure set out in the claim, without the technical risks associated with manufacture. By means of a combination of features, using thermal fixation to provide tension of the sewing thread, selecting the sewing threads and / or performing appropriate measures to provide well-defined radii of curvature for the hook yarn loops, such a precise and durable sewing seam fastening is provided between the closure rows and support straps. Wire breaks due to curvature are effectively prevented. This is achieved in such a way that deformations which, before long, can lead to breakage of the suture fastening no longer occur.

The described and other features of the invention will now be described in more detail with reference to the drawings showing only one structural example, in which Fig. 1 shows an enlarged plan view of a part of a zipper according to the invention, Fig. 2 shows a section on line AA of Fig. 1, Fig. 3 shows a bottom view, Fig. 1 on line BB and Fig. 5 shows a section corresponding to Fig. I4 of another structure of the zipper according to the invention.

The zipper shown in Fig. 1 has continuous rows of closure members 1 of synthetic monofilament and support strips 2, the closure rows 1 and support strips 2 being fastened together by a sewing seam consisting of catcher thread loops 3 and needle thread loops are located substantially overlapping in a projection falling into the plane of the closure member. In this case, the sewing thread loops 3, U surround the branches 5 of the closure members 6. In the construction example, the catch thread loops 3 go around the branches' 5 of the closure members 6. The stitching is shown as a double chain stitch seam, namely a single needle double chain stitch seam. The rows of closure members 1 and the support strips 2 are otherwise dyed essentially with the same color and also simultaneously.

According to the invention, the sewing thread loops surrounding the branches 5 of the closure members 6, i.e. in the structural example, the hook thread loops 3, are made of transparent monofilament or single-thread sewing threads. In this case, the transparent single-thread sewing threads 3, k may be uncoloured, even if the support strips 2 and the rows of closure members 1 are dyed. But it is also possible to dye the single-thread sewing threads 3, ^ simultaneously with the dyeing of the support strips 2 and the rows of closure members 1.

Care is always taken to ensure that several sewing thread loops are placed in parallel in parallel. The figures show a construction with trap wire loops 3 located on the branches 5 of the closure members 6, the construction example having three trap wire loops 3 parallel to these arms 5 with their intersections 8 located between adjacent closure members 6. Fig. 3 shows the back side with needle thread loops U. However, by changing the structure of the figures, it could be arranged that each upper branch 5 of the adjacent closure members 6 has at least two needle thread loops 1 + parallel with the hook thread loops 3 placed on the support strips 2.

It cannot be seen from the figures that the single-thread sewing threads 3, U can be made very close to the zipper in question by means of post-weaving. elements and that they can be post-cured using pressure and heat.

It is also essential for the invention that in each construction stitch three arches 7 of the hooking wire loop are arranged in parallel in the construction example, these arches 7 being located in the construction example on the branches 5 of the closing members. At least the catcher yarn loops 3 are here made of single-thread sutures. The arches 7 of the catcher wire loops could also be located below the support strips 2. It is found that in this embodiment the crossing points 8 of the single-thread sewing thread of the catch thread loops 3 are placed between the adjacent closure members 6 and that only the arcs 7 of the capture thread loops are arranged on the branches 5 of the closure members. Figure 1 further clarifies that the arcs 7 of the catcher wire loops have a radius of curvature throughout which is at least twice the diameter D of the needle thread.

Fig. 5 illustrates that the described arrangement of the hook wire loops 3 with at least three parallel bends of the hook wire loops 7 .