GB784159A - Improvements in lathes and like machine tools - Google Patents

Abstract

784,159. Lathe details. JEANNERET, J. L. Jan. 21, 1955 [June 1, 1954], No. 1943/55. Class 83 (3). A saddle 4, Fig. 3, and cross-slide 5 have stop means H for determining the depth-of-cut during longitudinal feed stop L for limiting the longitudinal feed and stop R for limiting the cross-feed, each means comprising a number, e.g. six, of stop bars for a sequence of cuts and being mounted in barrels 7-9 which are indexed simultaneously after each cut. The indexing is performed manually from a knurled knob 10 which drives a drum 56, Fig. 4, carrying a programme of the cuts to be taken and visible, a line at a time, through a slot 11. The knob also drives a sprocket 12 having a detent 121 for positively engaging the positions in turn, the sprocket driving, via chain 15, a sprocket 13 keyed to shaft 14. This shaft drives through bevel gears 16, 17 a shaft, sprocket 18 and chain 19, sprockets 20, 21 connected to the barrels 8, 9 and, via sprocket 22, chain 23 and sprocket 24, a shaft 40 connected to barrel 7. The barrels are rotatably mounted respectively on the bed A, the saddle 4 and the slide 5. Barrel 7 is of hexagonal cross-section, each facet being grooved longitudinally to receive the stop bars. Barrels 8, 9, Fig. 7, are cylindrical and retained in housings 33 by straps, the stop bars being secured in bores, equally spaced around the axes, by screws 35. The barrels are driven from the sprockets 20, 21 by removable spindles 26, 45 respectively, spindle 45 permitting movement of the cross-slide. The feeds may be disengaged by the stop-means, e.g. in the manner described in Specification 784,086.