Weft thread brake responsive to yarn characteristics in a loom

Details Weft thread brake responsive to yarn characteristics in a loom Weft thread brake responsive to yarn characteristics in a loom

1994-07-08

1995-12-19

Falik, Andy

Textiles: weaving

Weft manipulation

Tensions

139450, D03D 4734

Patent

active

054761220

ABSTRACT:
A weft thread brake for a loom has brake force application members controlled by a drive such as a high resolution stepping motor or a continuously adjustable drive for reducing or increasing a gap between the brake force application members. The weft thread moves through this gap. A thread tension sensor is arranged downstream of the brake and produces an actual thread tension signal that is used for producing in a closed loop unit, a brake force control signal for controlling the brake force in dependence on the actual thread tension signal. A rated weft thread tension value may be compared in the control unit with the measured actual weft thread tension signal and the result of this comparison is then used to produce the control signal to adapt the brake force to the thread characteristics and to maintain at all times during a weft thread insertion the required weft thread tension.

REFERENCES:
patent: 3633711 (1972-01-01), Pfarrwaller
patent: 3797426 (1974-03-01), Von Hagen
patent: 4641688 (1987-02-01), Gehring
patent: 4817681 (1989-04-01), Krumm et al.
patent: 5002098 (1991-03-01), Desmet et al.
patent: 5179980 (1993-01-01), Hubner et al.
patent: 5305966 (1994-04-01), Motta
"Reduction the Weft Thread Load with the Aid of a Newly Developed, Closed Loop Controlled Weft Thread" by Wulfhorst et al., published in textil praxis international, 1991, vol. 12, pp. 1292-1297-no translation.

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