Apparatus for spinning-in yarns in open-end rotor spinning units

Details Apparatus for spinning-in yarns in open-end rotor spinning units Apparatus for spinning-in yarns in open-end rotor spinning units

1981-02-11

1983-01-25

Petrakes, John

Textiles: spinning, twisting, and twining

Apparatus and processes

Piecing up

57405, D01H 1502

Patent

active

043696201

ABSTRACT:
The invention relates to an apparatus for the spinning-in of yarns in an open-end rotor spinning unit. The apparatus includes a spinning-in device for returning yarn end through a take-off duct into the spinning rotor, a severing device for shortening the yarn end to a predetermined length, and a withdrawing duct which communicates with the take-off duct and which is designed, on the one hand, for holding the yarn end by the action of a vacuum which, in the contact region of the two ducts, exceeds the working vacuum in the take-off duct, and, on the other hand, for withdrawing the severed yarn end. In accordance with an essential feature of the invention, at least one air nozzle opens into the withdrawing duct which during both spinning and spinning-in processes is connected to a subatmospheric pressure source, which nozzle is designed for introducing a fresh yarn end into the take-off duct by a controlled air outflow in a particular phase of the spinning-in process. The invention expediently utilizes the subatmospheric pressure air for both the spinning-in process and the withdrawal of impurities from the yarn in the take-off duct of the spinning rotor during the spinning process.

REFERENCES:
patent: 3354631 (1967-11-01), Elias et al.
patent: 4246749 (1981-01-01), Mikulecky et al.

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