| 摘要 |
A drive mechanism for a spindle of a tool machine, in particular a tool machine having a hob rotatably mounted thereon. Worm gearing is provided for driving the workpiece relative to the hob. Clearance is normally provided between the teeth on the worm and the teeth on the worm gear. Structure is provided for eliminating the clearance so that the drive of the workpiece is a positive drive and no errors exist due to the clearance normally provided between the teeth on the gear and the worm gear. In the particular embodiment disclosed in this application, a second worm is provided and is driven by the first-mentioned worm and worm gearing. The helix angle on the second worm lies outside of the automatic locking area and, in turn, acts onto a braking mechanism. |
