Sulzer Brothers Limited

Sulzer Rueti Ag

Wolfgang Greger

Paul Lincke

A weft yarn (1) leaving a stationary stock bobbin (2) is led through a compressed-air nozzle (6) and a deflector element (16) movable transversely to the direction of weft insertion (arrow 9), to the weft insertion mechanism (11) of a projectile loom. After each weft insertion the weft yarn (1) becomes deflected by the deflector element (16) from a yarn path (1a) running stretched into a cranked yarn path (1c) and returned towards the stretched yarn path (1a) during a following weft insertion. During a predetermined fraction of the weaving cycle which comprises the return of the weft yarn (1) into the stretched yarn path (1a), the compressed-air nozzle (6) is acted upon by compressed air so that the weft yarn (1) is additionally accelerated for a short time. After the return of the weft yarn (1) the compressed air feed to the compressed-air nozzle (1) becomes blocked during the remaining part of the weaving cycle. A gentle guidance of the weft yarn is thereby guaranteed with minimum consumption of compressed air and with a simple nozzle arrangement, and the occurrence of a 'snatch' upon stretching the weft yarn is prevented. The method is particularly suitable for the processing of sensitive yarn material in looms of high weft insertion power.

Method and apparatus for limiting stresses in weft yarn advancing

The brake is provided with a resilient member between the brake band and a brake lever. In addition, the resilient member is provided with recesses in the form of bores in a part of a resilient member subject to compression. The construction of the resilient member is such that the recesses render the resilient member capable of damping high stresses.

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Gundetswil, Switzerland

Wolfgang Greger