GB190302931A - Improvements in the Feed Motions of the Lathe and like Machine Tools. - Google Patents

Abstract

2931. Lang, W. B. Feb. 7. Lathes.-Relates to feed-motions for lathes and like machines, such as screw machines, arranged so that the surfacing, traversing, and screw-cutting feeds can only be thrown into gear separately. A gear box on the headstock receives one end of the leading-screw X, Fig. 3, and the feed-shaft V. A pinion B, loose on the leading-screw and driven from the lathe spindle, has a long boss carrying a bevel-wheel C forming one of a reversing-train by which the sleeve I can be driven in either direction by operating a clutch D. The sleeve carries four wheels E, F, G, H gearing with corresponding wheels loose on a sleeve N, loosely mounted on the feed-shaft. Any one of the wheels on the sleeve N may be separately connected to it by a sliding key 0, operated by a collar Q and handle outside the gear box. The sleeve has long clutch teeth in constant engagement with a clutch member R, which can be moved to engage a clutch member U to couple the sleeve to the feed-shaft, or to engage a clutch member S to couple the sleeve to a short shaft W connected by change gearing Z to the leading-screw. The clutch member R is operated by a handle outside the gear box. The feed-shaft V carries a worm sliding with the saddle and engaging a worm-wheel A<1>, Fig. 2, loosely mounted on a hollow spindle B<1> in the saddle apron, the wheel being coupled to the spindle by an ordinary friction clutch C<1>, D'. A pinion E' and wheel F<1> are loosely mounted on the spindle B', and can be separately connected to it by a sliding key G' operated by a knob C<2>. The pinion E<1> gears with a wheel L' on a spindle having a pinion K<1> gearing with the usual rack, while the wheel F<1> is connected by a train of wheels with the screw of the surfacing-slide. To enable the surfacing or traversing feeds to be automatically stopped, the worm gearing with the wheel A' is carried by a bracket rocking on the feed-shaft, from which the worm is driven by spur gearing. The bracket is held with the worm in gear by a spring pin, which can be withdrawn by the engagement of the saddle with a stop on the bed or by the engagement of the surfacing- slide with a vertical rod, either engagement rocking a shaft on the apron and allowing the worm to drop.