121932 ⎘
Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface; Friction spinning, i.e. the running surface being provided by a pair of closely spaced friction drums, e.g. at least one suction drum Friction drums, e.g. arrangement of suction holes