Yarn false twisting apparatus having improved thread-up capabili

Details Yarn false twisting apparatus having improved thread-up capabili Yarn false twisting apparatus having improved thread-up capabili

1981-06-12

1983-09-06

Petrakes, John

Textiles: spinning, twisting, and twining

Apparatus and processes

False twist device

57334, 57339, D02G 104, D02G 108

Patent

active

044021798

ABSTRACT:
A yarn false twisting apparatus is disclosed which comprises two rotating twist imparting members, with a pressure applying member comprising a cylinder-piston assembly positioned to bias one member toward the other at the twisting zone. The apparatus includes an improved yarn thread-up capability which avoids breakage when the yarn is initially twisted, and which includes a pressurized air supply system for biasing the piston of the pressure applying member into operative contact with the adjacent twist imparting member, and control means for substantially reducing the pressure during yarn thread-up to thereby limit the nipping force applied to the yarn. In one embodiment, the air supply system includes a reservoir for cushioning the application of the pressure on the piston to thereby avoid the rapid application of a nipping force on the newly threaded yarn.

REFERENCES:
patent: 2863280 (1958-12-01), Ubbelohde
patent: 3156084 (1964-11-01), Van Dijk et al.
patent: 3225533 (1965-12-01), Henshaw
patent: 3373554 (1968-03-01), Raschle
patent: 3394540 (1968-07-01), Bentov
patent: 3488941 (1970-01-01), Asaka
patent: 3495391 (1970-02-01), Njo
patent: 4050229 (1977-09-01), Hayahusa
patent: 4145871 (1979-03-01), Iwata et al.
patent: 4149366 (1979-04-01), Bass et al.
patent: 4339915 (1982-07-01), Dammann et al.

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