Channel plate for an open-ended rotor spinning device

1. A channel plate for an open-end rotor spinning device for closing off a rotor housing which can be charged with an underpressure during the spinning process, in which a spinning rotor rotates, having a channel plate tower extending into the spinning rotor, in whose shell face the outlet opening of a fiber guide channel is arranged and in whose front side a yarn draw-off nozzle can be fixed, wherein a concavely arched transition surface adjoins a cylindrical part of the shell face, and the channel plate tower has such a diameter at the height of the rotor edge of the spinning rotor that an annular gap of a gap width of maximally 2 mm between the spinning rotor and the channel plate tower results during the spinning process,

characterized in that

at most one half of the outlet opening ( 31 ) of the fiber guide channel ( 14 ) is arranged in the area of the cylindrical shell face ( 50 ), and the remaining part in the arched transition surface ( 60 ),

and

the wall area ( 33 ) of the outlet opening ( 14 ) remotest from the front side ( 42 ) is at a distance (a) in respect to the center longitudinal axis (M) of the channel plate ( 12 ) which is at least 0.5 to 3 mm greater than the distance (b) of the wall area ( 32 ), which adjoins the wall area ( 42 ), of the outlet opening ( 31 ) in respect to the center longitudinal axis (M).

2. The channel plate in accordance with claim 1 , characterized in that the channel plate ( 27 ) is embodied in two parts and has a central bearing receiver ( 34 ), in which an interchangeable channel plate adapter ( 12 ) can be fixed, which has an insert body ( 28 ) matched to the bearing receiver ( 34 ), as well as a channel plate tower ( 30 ) extending into the spinning cup ( 26 ) of the spinning rotor ( 3 ).

3. The channel plate in accordance with claim 1 , characterized in that it is dimensioned in such a way that it is suitable for spinning rotors ( 3 ) which have a rotor groove ( 41 ) of a diameter of maximally 30 mm.