DE1038748B - Device for folding perforated plastic strips for zippers - Google Patents

Description

Device for folding perforated plastic strips for zippers It is known. that one for link zippers and also for linkless zippers Instead of metal, plastics, preferably polyamide, are used.

Links are injection molded from plastic, for example, and in this case Process attached directly to a textile I) alld.

Zippers, the links of which consist of two spirals, are blown or sewn on.

These spirals are made on complicated special machines.

It has also been proposed to manufacture zip fasteners in this way. that a plastic band, which has appropriate holes, folded endlessly will.

\ NTif maii folds a strip endlessly by known means, will the material for each fold is drawn from the stretched length. This is but with a perforated strip in which the folds exactly to the perforations must lie. I don't like. because the cross-sectional weakening in the strip is causing the folding affect so that no sufficient accuracy can be obtained.

In addition there is. that with such a strip of Pols amide certain Stretching processes take place that deform diesel in an uncontrollable manner.

It has now been shown that the exact folding of perforated plastic tapes cannot be achieved in a rational way with the known means.

The present invention relates to a device for folding of perforated plastic strips for zippers to create a horny Folding permitted with simple means.

According to the invention, the folding now takes place in such a way that an upper punch is located catches in a hole so that the material is drawn in from both sides.

After the folding has taken place, a subsequent upper punch aligns the inevitable deformed previous fold.

After this work operation, these ailments move overhead upwards, while part of the elements that make up the lower shape are in the sub part disappears so that the feed to the next work step can take place.

In the drawing, the device according to the invention is in one embodiment shown schematically.

Fig. I shows a perforated plastic strip 3, the .tii den Places 1 and 2 is folded; Al) l>. II shows the folded plastic strip 3: Al> l). TIT provides information about the working position before the start of the folding; A-1> 1). TV shows the folding process during the folding process; Älil). N shows the position of the device before the further transport of the folded plastic strip.

A plastic strip 3, which has holes 8, should be at the points 1 and 2 of Fig. I.

According to the invention, this is done in such a way that a vertical direction Slidable upper punch 7 Illit catches 4 is provided, which are in the holes of the Engage plastic strip 3. As a result, the folding takes place in such a way that the material is used from both sides.

I) The previously performed folding is thereby somewhat defolled and becomes due to the trailing upper sternipel, which is also vertically displaceable 5 directed again.

After the folding process, both upper punches 5 and 7 move above. and a vertically displaceable one opposite the two upper punches associated lower punch 6 disappears downwards. The feed then takes place of the plastic strip 3.

Claims (1)

PATENT CLAIM Device for folding perforated plastic strips for zip fasteners, characterized in that the material is uniform during the folding process from a vertically displaceable upper punch (7) with catch lugs (4), which engage in the perforation of the plastic strip (3), evenly from both sides is used and another upper punch that can be moved in the vertical direction (5) is assigned to the upper punch (7) trailing, such that after the folding of the plastic strip (3) the two upper punches (5,7) as well as a vertical one Direction of displaceable lower punch, which is assigned opposite to the two upper punches (6) disappears upwards or downwards.