Adjustment of motor speed in yarn feeders according to yarn rese

Details Adjustment of motor speed in yarn feeders according to yarn rese Adjustment of motor speed in yarn feeders according to yarn rese

1989-02-10

1990-06-26

Falik, Andrew M.

Textiles: weaving

Weft manipulation

Weaving with stationary weft supply

D03D 4734

Patent

active

049363565

ABSTRACT:
A method and apparatus to adjust the motor speed in yarn feeders for textile machines and, in particular, weft feeders for weaving looms, wherein a yarn reserve is wound on a rotary drum held stationary, by a winding arm rotated by the motor. Photoelectric cells positioned close to a yarn outlet end of the drum emit signals which adjust--in cooperation with detection of the rotations of the winding arm--the motor speed of the feeder. These signals differ from each other according to whether an advancing turn of the yarn reserve intercepts a luminous beam for a relatively long period of time or whether yarn drawn from the reserve by the loom intercepts a luminous beam for a relatively short period of time. These signals are discriminated so as to adjust said speed, so as to guarantee the constant presence of an adequate yarn reserve on the drum.

REFERENCES:
patent: 4226379 (1980-10-01), Brouwer et al.
patent: 4715411 (1987-12-01), Van Bogaert et al.
patent: 4799517 (1989-01-01), Bucher
patent: 4811762 (1989-03-01), Bucher et al.

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