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US 7,111,446 B2Granted
Method and apparatus for operating an open-end rotor spinning unit
AssigneeSaurer GmbH & Co. KG
InventorsHeinz-Georg Wassenhoven, Norbert Coenen
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AssigneeSaurer GmbH & Co. KG
InventorsHeinz-Georg Wassenhoven, Norbert Coenen
Estimating the term…
An open-end spinning unit, which comprises a spinning rotor 1 that rotates during the spinning operation at a high rotational speed in a closed rotor housing 2. The spinning rotor is rotated by an individual electric motor drive 18 and supported in a smoothly running bearing assembly. When the drive is disconnected and the rotor housing is properly closed by a cover element 8, the spinning rotor is biased and rotated by an airflow resulting from a vacuum prevailing in the rotor housing and the motor drive operates as a generator. At least one of the electric quantities Pv, Gv which develop during the generator operation of the drive 18 is monitored, and upon exceeding a threshold value which can only be attained when the cover element is properly closed, a signal S is generated and processed in a control unit 30 to cause the cover element 8 on the rotor housing 2 to be locked, and thereafter the drive 18 is connected to its electrical supply to rotate the rotor at high speed.
A method for operating an open-end rotor spinning unit, which comprises a spinning rotor that rotates during the spinning operation at a high speed in a closed rotor housing which is closed by a cover element which is moveable between open and closed positions, with the spinning rotor being operated by an individual electric motor drive and supported with its rotor shaft in a smoothly running bearing assembly, said method comprising the step of
An open end rotor spinning apparatus comprising
Dependencies are inferred from the claim text.