Method of and apparatus for piecing yarn in open end rotor spinn

Details Method of and apparatus for piecing yarn in open end rotor spinn Method of and apparatus for piecing yarn in open end rotor spinn

1979-04-12

1981-01-27

Watkins, Donald

Textiles: spinning, twisting, and twining

Apparatus and processes

Piecing up

D01H 1502

Patent

active

042467497

ABSTRACT:
A method of and an apparatus for piecing yarn in open end rotor spinning units. The returning of the yarn end into the spinning rotor for piecing is performed in two stages, in the first of which the yarn is stopped immediately upon breakage within the sucking range of the spinning rotor, and is brought immediately thereafter into a withdrawal chamber in which the yarn end is retained. In the second stage the yarn end is separated and deposited in said withdrawal chamber, and the new yarn end is introduced by further reverse motion into the spinning rotor. The apparatus has a withdrawal chamber interposed between the inlet of the withdrawing channel and a cutting mechanism. In one embodiment said chamber is connected to the withdrawing channel, opposite which there is mounted a nozzle connected to a controlled pressure air source. In another embodiment there is provided a nozzle communicating with the withdrawal chamber, said nozzle being connected to a controlled source of underpressure.

REFERENCES:
patent: 3695017 (1972-10-01), Hori et al.
patent: 3999362 (1976-12-01), Schulz et al.
patent: 4145867 (1979-03-01), Kamp
patent: 4166356 (1979-09-01), Chrtek et al.

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