Adjustment of weft yarn stretch in a shed of an air jet loom

Textiles: weaving – Weft manipulation – Weaving with stationary weft supply

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Details

1393702, 1394355, 139452, D03D 4730

Patent

active

050675273

ABSTRACT:
A method for adjusting weft yarn stretching in an ordinary or traversing shed and for adjusting the air consumption of relay nozzles forming a travelling zone in the shed of an air jet loom having one or more yarn feed systems. The weft yarns are picked from a weft preparation system by main nozzles with the assistance of relay nozzles. The arrival of the weft yarns is monitored by a weft stop motion, the weft yarns being stopped in their movement by stopper elements disposed before the shed and a facility is provided for controlling the pressure and timing of the main nozzles and the relay nozzles. By the measurement and statistical evaluation of a time difference .DELTA.t.sub.1 between the arrival of the weft yarn at a weft stop motion at the end of the shed and the actual stop shock when the weft yarn is stopped by the stopper elements before the shed, a signal representative of yarn deflection found which is of use for optimizing and controlling the adjustment of the relay nozzles.

REFERENCES:
patent: 4673004 (1987-06-01), Rosseel et al.
patent: 4827990 (1989-05-01), Takegawa
patent: 4877064 (1989-10-01), Pezzoli
patent: 4967806 (1990-11-01), Imamura et al.

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