Open end spinning machine

An open end spinning machine comprising a frame, a plurality of spinning units disposed in side-by-side juxtaposition on said frame, each spinning unit comprising a housing and having at least a spinning rotor mounted at the end of a shaft jouralled in a shaft bearing, means for feeding fibers to said rotor, and means for withdrawing the yarn formed in said rotor, said machine having drive means for driving the shaft of each of the rotors in each of said spinning units and the guide means for mounting said drive means on said frame, said housing comprising a first portion accomodating said spinning rotor, and a second portion in which said bearing for said rotor shaft is fixedly mounted, said first and second housing portions being separably secured together and having cooperatively engaging contact surfaces and counter-contact surfaces respectively permitting exchange of said rotor and rotor shaft and being effective to secure said second portion against axial and radial movement with respect to said first portion, said guide means being adjustable along the axis of said rotor shaft to permit engagement of said drive means and said rotor shaft irrespective of the shaft bearing employed.