Method and apparatus for limiting stresses in weft yarn advancin

Details Method and apparatus for limiting stresses in weft yarn advancin Method and apparatus for limiting stresses in weft yarn advancin

1994-01-21

1995-06-13

Falik, Andrew M.

Textiles: weaving

Weft manipulation

Weaving with stationary weft supply

139194, 1394351, 139439, D03D 4734

Patent

active

054233550

ABSTRACT:
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.

REFERENCES:
patent: 4513792 (1985-04-01), Lincke
patent: 4649965 (1987-03-01), Wenig et al.
patent: 5199468 (1993-04-01), Aarts et al.

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