GB191505112A - Improvements in or relating to Machines for Cutting Metal Bars and the like. - Google Patents

Abstract

5112. Lumsden, T. April 1. Lathes.-Rotary tool-head cutting-off lathes are arranged for constant cutting speed during the cut,the speed and rate of feed being independently adjustable. Automatic stop and quick-return motions for the tool-slides are provided. The tool-slides 3, Fig. 2, are traversed by screws 4 geared to a central shaft 7 driven by bevel-gearing 8 from a wheel 10 loose on the spindle and driven so as to overrun it slightly through sliding-key change-speed gearing 65 and a shaft 14. The change-gearing is mounted on a sleeve clutched at 80 to the shaft 14. A broad face wheel 21 gears with a wheel on a nut 23 on the spindle arranged to overrun correspondingly to the wheel 10. A yoke 26 engaging a groove 25 operates a lever system 42, 46 controlling expanding pulleys through sectors and sliding bushes 36, 53. The bushes control the movable flanges through springs 39, 56 adjustably loaded bv the hand-wheel 63 and screwed rod altering the distance between the levers. The clutch 80 is controlled by a yoke and hand-lever on a sleeve loose on a cross shaft carrying an arm engaging an adjustable stop on the hand-lever, and an arm engaging a stop 86 connected to the yoke 26. A brake 91, actuated by a hand-lever, provides for retarding the shaft 14 and consequently the nut 23 and wheel 10 to provide a quick return for the tool-slides and speed-controlling mechanism. The driven shaft 37 is splined to a shaft 60 traversable by a lever 73 to mesh a pinion 61 with a wheel 62 on the tool head or to clutch the pinion to a loose sleeve 71 carrying a pinion meshing with the wheel 72. The various control levers are arranged at the front of the machine.