Process and apparatus for controlling twist density during textu

Details Process and apparatus for controlling twist density during textu Process and apparatus for controlling twist density during textu

1975-04-28

1976-05-11

Watkins, Donald E.

Textiles: spinning, twisting, and twining

Apparatus and processes

Web material

57157TS, D02G 102

Patent

active

039553493

ABSTRACT:
Apparatus and processes are described in which a friction twist imparter is used to twist two filaments or filament bundles while passing through a processing zone in which the filaments are textured by imparting a temporary high twist to the filaments and heat-setting the twisted filaments. Variations in twist density due to variations in the co-efficient of friction between the ply-yarn and twist imparter are controlled by separating the ply-yarn into two separate filaments or bundles of filaments at a point beyond the friction imparter and sensing variations in the position of the separation point, the wrap angle or tension, or both, of the ply-yarn leaving the friction twist imparter being adapted to such variations. The means for this particularly described are mechanical and include a spring-loaded lever projecting between the separated filaments at the separation point so as to follow changes in the position of this point. The lever actuates an irreversible worm gear to position a movable thread-guide through which the ply-yarn passes on its way from the twist-imparter to the separation point, thereby adjusting the wrap angle. The mechanism may be arranged so that the position of the separation point directly determines the position of the thread-guide, or so that the separation point only determines the direction of movement of the thread-guide.

REFERENCES:
patent: 3261155 (1966-07-01), Kunzle
patent: 3355872 (1967-12-01), Gilchrist et al.
patent: 3683611 (1972-08-01), Buzano
patent: 3747317 (1973-07-01), Willis
patent: 3812664 (1974-05-01), Schippers

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