FI56482C - FOERFARANDE FOER FRAMSTAELLNING AV DRAGKEDJA - Google Patents

Description

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Ma lbj (11) UTLÄGGNINGSSKRIFT 56482 C (4S) Patent ciyönr; ^ tty 11 C2 1930 Patent oeddelat ^ v (51) Kv.ik. * / Int.ci. » A 44 B 19/42 ENGLISH - Fl N LAN D (21) PMent Application - Patentaniöknlng 3 ^ 8/71 (22) Filing date - Ansöknlngsdag 02.12.71 '' (23) Starting date — Glltlghetsdag 02.12.71 (41) Published public - Bllvit offentlig 05 · θ6.72

Patent and Registration Office .... ... , . ,,.

'. (44) Date of dispatch and of hearing. -. __

Patent and registration authorities Ansökan utlagd och utl.skriften publicerad 31 * 10.79 (32) (33) (31) Pyydetty atuolkeus — Begird prlorltet 0 ^ +. 12.70

Oi.12.70 Japan-Japan (JP) l5 ~ 108006, 15-108007 (71) Yoshida Kogyo Kabushiki Kaisha, No. 1, Kanda Izumi-cho, Chiyoda-ku,

Tokyo, Japan-Japan (JP) (72) Fumio Terada, Toyama-ken, Yoshio Matsuda, Toyama-ken, Yoshiharu Yama-guchi, Toyama-ken, Japan-Japan (JP) (7l) Leitzinger Oy (5l) Method of zipper The present invention relates to a method of making a zipper comprising knitted support strips, and more particularly to a method of adding double rows of interlocking fasteners to a warp-knitted strip. Companies - Förfarande för framställning av dragkedja

Such known methods comprise arranging two support strips close to each other with the edges facing each other and placing rows of two interlocking members on the strips to sew them longitudinally along opposite edges. However, there have always been certain irregularities in the movement of the support belts as they are moved from the feed roller to the sewing machine, sometimes due to irregular rotation of the roller, frictional resistance of the belt guides, and other operational reasons. This can often cause irregularities in the distribution of fasteners sewn to the straps. Therefore, with such previously known methods, it has been difficult to achieve zippers with the desired product quality.

It is an object of the present invention to provide an improved method by which the production of high quality zippers is achieved and which can substantially eliminate the difficulties encountered in previously known methods.

In particular, it is an object of the present invention to provide a method for adding two rows of interlocking fastener members to warp-knitted support strips with sufficient dimensional stability to ensure an even distribution of the members when knitted into the strips.

This object is achieved by a method according to the invention according to the features set out in claim 1.

In the following, the invention will be described in more detail with reference to the accompanying drawings, in which

Figure 1 is a perspective view of a warp knitted support strap for attaching fastener members thereto in accordance with the present invention;

Figure 2 is a perspective view of a ribbon on which two rows of interlocking members are knitted;

Figure 3 is a perspective view of the strip with its members and separated into two opposite strips;

Figure 4 is a perspective view of a zipper made in accordance with the present invention;

Fig. 5 schematically shows on an enlarged scale a knitting pattern in a part of a support strip made in accordance with the present invention;

Figure 6 is a perspective view of a strip applied in accordance with the present invention with increased width;

Fig. 7 shows the strip as in Fig. 6 but illustrating it separated in width in a number of support strips of the desired product similar to the strip shown in Fig. 1; and

Fig. 8 shows schematically on an enlarged scale a knitting pattern in a part of the strip shown in Fig. 6.

According to the present invention, there is provided a method of making a zipper comprising a double carrier tape provided with a water-soluble suture extending longitudinally and centrally therein, the method being substantially characterized by the steps of: a) sewing with; b) dissolving this suture and thus separating the double carrier strip into two identical halves along said suture; and c) adding the slider and end stops to the strips thus separated and cutting the strips to the desired product length.

Referring now to Figure 1, it will be seen that it specifically shows a double carrier strip T made of a warp-knitted fabric and provided with a water-soluble synthetic fiber suture 10, such as polyvinyl alcohol. The stitch 10 extends longitudinally and centrally to the support strip T and covers the dividing line along which the strip is split into similar halves and T 1 as described above. A synthetic fiber warp yarn 10b is provided which dissolves in contact with water, as shown in Fig. 5, and which comprises the above-mentioned suture 10.

The double row of organs, i.e. the two rows E of fastening members previously gripped together are added to the support strip T by aligning the main portions C of the gripping members Ea with the stitch 10 and then sewing them close together longitudinally with needles N having sewing threads 11 coming from the sewing machine (not shown) as shown in Fig. 2. . More specifically, two rows of members in contact with each other are sewn into the strip T by loops of two parallel stitches S running over the branch portions of the members and extending parallel to the opposite sides of the stitch 10 on them.

the double carrier strip T, with the rows of interlocking members thus knitted, is now immersed in water, for example in thermal chemical liquids or such, after which the suture 10 is dissolved and thus separates the strip into similar halves T1, T2, which now have opposite edges; 12 along which the rows of members are attached, as shown in Figure 3. The suture 10 can be conveniently dissolved by immersing the strip T in a dye bath or a clean water bath, which is usually provided in a zipper manufacturing plant.

The slider 13 and the end stops 14, 14 'are now added to the finished zipper F at predetermined intervals and cut to the desired product length, as illustrated in Fig. 4.

Figures 6, 7 and 8 show another embodiment of a carrier strip according to the present invention. As can be seen from Figure 6, it is provided with a relatively wide warp-knitted band TS having a plurality of alternating first and second groups of water-soluble sutures 10 that are soluble at two different temperatures. A suitable synthetic fiber can be treated to become water soluble at a temperature of, say, about 65 ° C, for use in the first group of sutures 10a. Likewise, the second group of sutures 10b may be formed with a synthetic fiber that is water soluble at about 90 ° C. These groups of sutures alternate at predetermined intervals with the strip TS, and the first group 10a delimits a plurality of dividing lines along which the wide strip is first separated into sections Tn by immersion in water at about 65 ° C, each comprising a double support strip T similar to that shown in Figure 1. the part Tn includes a second stitch 10b delimiting the dividing line along which the interlocking rows of members are attached to the strip as previously described. The double carrier tape T with the rows of interlocking members is then again immersed in water at 90 ° C, thus dissolving the second suture 10b and thus separating the tape into similar halves, as described above.

It will be appreciated that the amount of production of such fastening tapes and thus the total number of fasteners produced will increase many times over and that the fastening members can be fitted to the tapes without irregularities in the distribution of the members.