Textiles: weaving – Special-type looms – Multiple-shed
Patent
1996-08-27
1998-06-23
Falik, Andy
Textiles: weaving
Special-type looms
Multiple-shed
139383R, 139431, D03D 100, D03D 1300
Patent
active
057691304
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for producing a belt, in particular a seat belt for a motor vehicle, in which two weft threads are inserted into at least one shed.
BACKGROUND OF THE INVENTION
The invention relates in particular to a seat belt for a motor vehicle having special requirements, in particular for the anti-roll bar. In the case of belts of this type it normally involves belts woven in a single ply, which are produced with or also without special selvedges.
DESCRIPTION OF THE PRIOR ART
The achievement of these requirements by a simultaneous insertion of a multifilament and monofilament weft thread is known. In addition it is also known that the insertion of the two different weft yarns may occur by two weft needles Acting in the same direction or by two weft needles acting in opposite directions, e.g. EP 0 021 104 A1,DE 40 09 455 A1, DE 33 45 508 C2, EP 0 579 938 A2.
To reduce or respectively to avoid the known disadvantages of the seat belts, e.g. twisting of the belt in the mounting, film roll effect when winding in the belt roller, winding size, but on the other hand a belt fitting smoothly to the person to be secured is required, a belt having a high transverse rigidity is desired. This is achieved, as is generally known, by the insertion of monofilament weft thread or by the insertion of a monofilament and a multifilament weft thread.
By the insertion of a monofilament or also a multifilament and an additional monofilament weft thread, with the weft reversal at least on the weft insertion side a so-called saw selvedge is produced, which results in unpleasant scratches on the skin, clothes and in belt deflection. Even injuries to the skin are not out of the question. Likewise the deflection mountings can be damaged by the saw selvedge, whereby the belt may in turn become damaged.
Seat belts having woven-on hollow selvedges are now known e.g. from EP 0 021 104 A1. In this case a multifilament and a monofilament weft thread, which run in the same direction or in the opposite direction, are simultaneously inserted into the sheds with its own weft needle in each case. The multifilament weft thread weaves through the main shed and through the selvedge shed, while the monofilament weft thread is only inserted through the main web and consequently is not contained in the selvedge. The wovenon edge parts are closed by tension of the monofilament weft to form hollow selvedges.
However this type of seat belt has considerable disadvantages. These are inter alia: selvedges without full utilization of the tensile strength, considerable cost expenditure, selvedges of unequal thickness, variation in thickness of the selvedge to the center, chafing resistance problems caused thereby.
Seat belts without edge parts are also known (e.g. DE 33 45 508 C2). In this case a multifilament and a monofilament weft thread are also simultaneously inserted, with no separate selvedges being woven on. A central part and an edge part are formed. The multifilament weft thread is inserted through the entire belt width, i.e. central part and edge part, while the monofilament weft thread is only inserted into the central part of the belt. Only for the central part are both weft threads inserted into a common shed.
This type of seat belt also has considerable disadvantages. Thus for example the two fabric selvedges are not uniform, i.e. there are uneven selvedges. The tensile strength may decrease by varying warp take-up (in the central part monofilament and multifilament weft threads, in the edge parts only a multifilament weft thread, which corresponds to a change in the diameter of the weft thickness) between central part and edge part. Moreover a dent bar may under some circumstances be produced between the edge part and central part by the weft reversal, i.e. by the weft loops of the monofilament weft, which as is known are harder and more brittle. There is also the danger that squeeze rollers during the subsequent processing work the weft loops of the monofilament yarn on the multifilament warp and weft threads in
REFERENCES:
patent: 4027703 (1977-06-01), Diesner
patent: 4202381 (1980-05-01), Bucher
patent: 5167263 (1992-12-01), Kelen et al.
patent: 5188884 (1993-02-01), Smith
patent: 5299603 (1994-04-01), Reiter
Carl Stahl GmbH & Co, KG
Falik Andy
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