Antriebsvorrichtung fuer die Hauptspindel einer Drehmaschine

摘要

A lathe whose hollow horizontal work spindle has a rear end portion extending from the headstock and carrying the chuck actuating mechanism. A discrete prime mover at the outside of the headstock transmits torque to the end portion of the work spindle through a separable transmission whose case is centered by a collar provided at the exterior of the headstock and surrounding the end portion of the work spindle. The transmission has an input element which receives torque from the prime mover, e.g., through a clutch or coupling, and a set of toothed members one of which is removably mounted on the end portion of the work spindle and another of which meshes with the one toothed member and is driven by the input element. The transmission can constitute a variable-ratio gear transmission, a constant-ratio gear transmission or a belt transmission wherein the second toothed member is an internally toothed belt.