Patent ID: 7377094

Claim:
An open end rotor spinning machine with plural workstations ( 2 ) each having a spinning device for producing a yarn, a yarn take-off mechanism ( 18 ) and a winding device for producing a cross-wound bobbin ( 22 ) rotatably held in a creel having a bobbin drive roller ( 23 ), each spinning device having a spinning rotor circulating in a spinning housing at a high speed, a fiber band opening roller and a fiber band draw-in cylinder ( 14 ) driven by a single drive ( 15 ), each yarn take-off mechanism ( 18 ) being loadable by a single drive ( 19 ) and each drive 19 of each yarn take-off mechanism 18 being reversibly driven, each workstation ( 2 ) having located thereat and dedicated exclusively to the respective workstation and separate from other workstations: (i)a mechanism ( 10 ) for the defined cutting to length of a yarn ( 30 ) retrieved manually from the respective workstation's cross-wound bobbin ( 22 ), (ii) a storage mechanism ( 37 ) for receiving a specific yarn quantity, (iii) a drive mechanism ( 7 ) which can be activated in a targeted manner for lifting the respective workstation's cross-wound bobbin ( 22 ) from the bobbin drive roller ( 23 ), and (iv) a manually activatable control mechanism ( 9 ) operable, during a piecing process, to activate the respective workstation's drive ( 19 ) of the yarn take-off mechanism ( 18 ), the respective workstation's drive ( 15 ) of the fiber band draw-in cylinder ( 14 ) and the respective workstation's drive mechanism ( 7 ) to lift the cross-wound bobbin ( 22 ) according to a predetermined piecing program.