Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1992-08-31
1994-04-05
Falik, Andrew M.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
139 22, D03D 1300, D03D 3500
Patent
active
052996034
DESCRIPTION:
BRIEF SUMMARY
SUMMARY OF THE INVENTION
The invention relates to a method for weaving belt material on a needle loom with two weft needles, that is to say weft loop inserting needles, operating in opposite directions. Such looms are known, see for instance the German patent specification 390,073.
The present invention is intended to provide a method for manufacturing belt material in a form more particularly suitable for seatbelts. In the case of such belts high transverse rigidity is desirable so that on the one hand the belt snugly engages the body of the person to be secured while on the other hand it smoothly runs through the belt fittings and may be readily wound up. In this respect the belt should wind up as a minimum sized coil so that space is saved.
High transverse rigidity may be achieved by the use of monofilament weft, which is relatively hard. The hardness of such a monofilament weft is however responsible for its lateral bends forming rough borders to the belt material which have an objectionable chafing action that is to say they produce an abrasive effect on the skin and clothing of the person using the belt.
The aim is now to provide a method for weaving belt material with the use of monofilament weft which ensures that border reversal bends of the monofilament weft do not project from the borders of the belt. This may be achieved in principle by having border portions of the belt material woven with a multifilament weft like the main part of the belt. Then however there is the problem of securing the rows of heads of the monofilament and of the multifilament weft and furthermore producing a belt material which makes a symmetrical impression, that is to say of which both border portions at the most hardly differ from each other.
The center part of the belt material is woven jointly by the two weft needles, of which one supplies a multifilament weft which furthermore extends over the width of the border portions while the other weft needle supplies a thread, which only forms the center part of the belt material. This latter thread is preferably a monofilament thread. If desired it is however possible in place of it to use a multifilament thread which is however stiffer. The two border portions are only woven by one of the two weft needles, for which purpose the warp threads of the two border portions are used to form a partly open shed each, (and more particularly a half open shed) through which only one of the two weft needles is moved, while the other weft needle is always operated outside it, that is to say above or underneath this partly open shed. The heads of the weft loops woven with the border portion warp threads are secured by a row of stitches constituted by an auxiliary thread and arranged externally on the border portion. On the contrary the heads of the weft loops, which are only woven with the center part warp threads, are secured by a row of stitches constituted by further auxiliary thread, which is arranged at the outer border of the center part and at the inner border of the adjacent border portion, that is to say further inside the belt material than the first mentioned row of stitches.
It has surprisingly been found that despite this asymmetrical structure the belt material creates a symmetrical impression and the lack of symmetry is concealed to the eye.
A proposal has been made in the European patent publication 0 147 621 B1 to weave belt material having a center part, which is woven using monofilament and multifilament weft, whereas the one border portion is only woven with the one multifilament weft thread. The intention is to weave such a belt material with separate needles or shuttles. Although it is possible to weave such belt material with such border portions using shuttles, such a method of weaving is excessively slow and hence expensive. The said patent publication does not provide any teaching as to how belt material is to be woven using weft needles and having two border portions which are only woven from the single, that is to say multifilament thread.
Preferably auxilia
REFERENCES:
patent: 1622542 (1927-03-01), Renshaw
patent: 4007763 (1977-02-01), Sellers et al.
patent: 4421142 (1983-12-01), Muller
patent: 4750529 (1988-06-01), Watanabe
Berger Johann
Falik Andrew M.
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