Procedure for re-equipping and simultaneous modernization of an

Details Procedure for re-equipping and simultaneous modernization of an Procedure for re-equipping and simultaneous modernization of an

1999-04-22

2000-06-27

Stryjewski, William

Textiles: spinning, twisting, and twining

Apparatus and processes

Piecing up

57281, 57269, D01H 1326

Patent

active

060791950

ABSTRACT:
A procedure is described in which an open-end rotor spinning machine already in operation can be modernized by means of re-equipping it with new parts. This machine comprises device means for interrupting the spinning process at a spinning station for the purpose of a doffing operation. The machine comprises a doffing arrangement which is movable relative to the spinning stations, which doffing arrangement comprises devices for exchanging a full bobbin for an empty yarn-winding tube. The machine comprises further at least one piecing arrangement movable in relation to the spinning stations, which is designed to restart spinning at the spinning station with a starting winding already connected to the yarn-winding tube. It is an object of the modernization that the piecing arrangement is replaced with a new piecing arrangement, which is designed to restart spinning with a starting yarn which is not connected to the yarn-winding tube, and subsequently to attach a newly spun yarn to the yarn-winding tube. In the case of the new piecing arrangement any piecing point of the yarn after a doffing operation onto the bobbin is omitted. This results in an increase in bobbin quality. The piecing arrangement is also operable to perform piecing operation in case of a yarn break with a partially full bobbin, where yarn from the partially full bobbin is used for piecing.

REFERENCES:
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patent: 4539803 (1985-09-01), Ferrro et al.
patent: 4920739 (1990-05-01), Raasch
patent: 5676322 (1997-10-01), Stahlecker

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