Method and apparatus for controlling the tension and the present

Details Method and apparatus for controlling the tension and the present Method and apparatus for controlling the tension and the present

1997-03-21

1998-10-06

Falik, Andy

Textiles: weaving

Weft manipulation

Weaving with stationary weft supply

1394351, 1394352, 1394354, 139194, D03D 4730

Patent

active

058162968

ABSTRACT:
The tension of a weft thread in a loom is controlled during particular time phases within the weft supply, weft presentation, weft seizing, and insertion, including the initial phase of entering into the loom shed. Additionally, the weft thread tension may be controlled during the duration of the actual insertion phase when the weft thread travels through the shed. For this purpose a twin nozzle or two separate nozzles are arranged downstream of the weft supply and preferably upstream of a weft brake or weft stop motion. The double nozzle can supply pneumatic impulses in the insertion direction (ID) and/or in the opposite direction (OD). The operation of the double nozzle is controlled by a program that determines the timing and the duration of the pneumatic impulses applied to the weft thread in the insertion direction and/or in the opposite direction. Thus, the twin nozzle is capable of applying a tension for the weft thread during critical phases in the weft supply presentation and insertion for gently handling the weft thread.

REFERENCES:
patent: 4501008 (1985-02-01), Rosseel et al.
patent: 5012844 (1991-05-01), Griffith
patent: 5159822 (1992-11-01), Schmid et al.
patent: 5226458 (1993-07-01), Bamelis
patent: 5303746 (1994-04-01), Wahhoud et al.
patent: 5343898 (1994-09-01), Fredriksson
patent: 5423355 (1995-06-01), Greger et al.

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