Device for modifying the yarn wrap angle in a friction false-twi

Details Device for modifying the yarn wrap angle in a friction false-twi Device for modifying the yarn wrap angle in a friction false-twi

1976-02-27

1977-01-11

Petrakes, John

Textiles: spinning, twisting, and twining

Apparatus and processes

Receiving twist type

57 7745, D02G 108

Patent

active

040020185

ABSTRACT:
A friction false-twist device for texturing textile yarns of thermoplastic synthetic material comprises a main friction element mounted to rotate about a first fixed axis and formed as a sphere or ellipsoid with at least one circular groove centered on the axis, into which projects the rim of a friction disc rotatable about a second fixed axis parallel to the first. Yarn to be twisted is wrapped partially over the curved surface of the main friction element and past the edge of the friction disc to a yarn-guide unit adjustable over substantially half the curved surface of the main friction element at a constant distance from that surface. The yarn-guide unit includes a guiding disc which causes the yarn to deviate after leaving the main friction element. To avoid excessive yarn tension the guide unit is adjusted to provide a comparatively small wrap angle over the curved surface during threading, and is then adjusted to provide a larger wrap angle for effective twisting. The yarn-guide unit may be mounted to slide on an arcuate rail along which it can be locked in any position. To absorb high tension that may arise at the beginning of false twisting, a buffer such as a spring may be interposed between the yarn guide unit and an adjustable abutment.

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patent: 3820317 (1974-06-01), Raschle
patent: 3854276 (1974-12-01), Marzoli
patent: 3901011 (1975-08-01), Schuster
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patent: 3932985 (1976-01-01), Naylor
patent: 3942313 (1976-03-01), Gassner et al.
patent: 3955350 (1976-05-01), Schuster

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