GB112541A - Improved Automatic Lathe. - Google Patents

Abstract

112,541. Veritys, Ltd., and Rogers, D. E. Feb. 28,1917. Lathes.-Relates to hollowspindle automatic lathes of the type in which the tools are fed to the workbv cams revolving coaxially withthe spindle and consists in means, actuated by the main drive but controlled by the cams, for returning the tools and rotating the turret if one is used. In the lathe shown, the tools are carried in a turret n which is traversed towards the work c<5> by cams d<2> and returned by a screw and nut. The turret is carried by a slide n<2> which is moved on an adjustable saddle n<3>, and is connected to move with a carriage l, Fig. 3, by adjustable rods o, o<2>. The cams d<2> act on a bowl l<2> secured to a slide l<3> movable transversely on the carriage l. When a cam bears on the bowl l<2>, the slide l<3> is moved to the right in Fig. 3 against a spring l<5>, and disengages a hinged pawl l<7> from a ratchet wheel m. The carriage l and turret slide n<2> are thus traversed to bring a tool up to the work, the worm wheel g<2> moving idly over the worm g, Figs. 1 and 3, which is keyed to a shaft e, geared to the lathe-spindle. This shaft e also carries a worm h which drives the cam drum d through the gearing shown. When the cam d<2> leaves the bowl l<2>, the spring l<5> returns the slide l<3> to the left and engages the pawl l<7> with the ratchet wheel m, which, owing to its contact with the friction-disk m<4>, brakes the worm wheel g<2> so that the latter acts as a nut on the screw q and the carriage l and turret are returned to their original positions. The shaft e carries loosely a third screw or worm i, and also a fast collar j having a pin j<2> which can engage a similar pin i' on the loose screw i. The screw i moves to and fro on the shaft e under the control of the turret slide n<2>. When the turret reaches the limit of its movement to the left in Fig. 1, at which time the bowl l<2> is in one of the small depressions d<3> in the cam drum, a lug on the lower side of the turret is disengaged from a guide groove, and the turret can be rotated to bring another tool into use. This rotation is effected by the collar rotating the worm i which, through friction gear i<3>, i<5>, Fig. 5, rotates the turret spindle.