Method and apparatus for compensating warp thread tension or elo

Details Method and apparatus for compensating warp thread tension or elo Method and apparatus for compensating warp thread tension or elo

1999-12-07

2000-10-24

Falik, Andy

Textiles: weaving

Warp manipulation

Feeding

139 97, D03D 4914

Patent

active

061351636

ABSTRACT:
Different groups of warp threads are subject to different variations of warp thread tension during shed changes, especially when weaving a fabric having portions such as fabric edges with different weave binding patterns. To provide different warp thread tension compensation for the different thread groups, a cam-like first tensioning module is arranged protruding from the circumferential surface of the backrest along the entire operating width thereof. Second and third tensioning modules are arranged and engaged over the first tensioning module at particular selected axial locations on the backrest. While the second and third tensioning modules provide a constant deflection path distance for second and third warp thread groups guided thereover, the first tensioning module provides a varying deflection path distance for the first warp thread group guided thereover, depending on the oscillating rotational angular position of the backrest. The backrest oscillatingly rotates under a passive compensating spring tension and/or under a positive actuation mechanism coupled to the main loom shaft. The respective warp thread tension of each group of warp threads can be compensated differently or independently from the other groups. The arrangement can be easily reconfigured in a modular fashion to be adapted to the needs of weaving different product articles.

REFERENCES:
patent: 1077125 (1913-10-01), Doughty
patent: 1254306 (1918-01-01), Bowen
patent: 3727646 (1973-04-01), Mares et al.
patent: 3759299 (1973-09-01), Selivanov et al.
patent: 3871419 (1975-03-01), Pfarrwaller
patent: 4108214 (1978-08-01), van Mullekom
patent: 4262706 (1981-04-01), Popp et al.
patent: 6003564 (1999-12-01), Cahuzac et al.

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