GB521759A - Improvements in and relating to automatic lathes - Google Patents

Abstract

521,759. Lathes. APPAREILLAGE GARDY SOC. ANON. Nov. 25, 1938, No. 34348. Convention date, Jan. 15. [Class 83 (iii)] In an automatic lathe the main driving shaft 25, Fig. 1, is located at one side of the lathe and drives three auxiliary shafts 37, 38, 39 arranged at the three remaining sides, at least one of these being provided with cams, the arrangement providing for ready access to all operative elements such as gears and cams. Motor 2, Fig. 2, drives through gearing 3, 4 and change gears 8, 9, a shaft 7 having a chain wheel 10 and a pinion driving a chain wheel 12 loose on the shaft 6. The chain wheels drive the spindle at machining and screwing speeds. The gears 4 also drive a pulley 23 transmitting to a pulley driving the shaft 25, Fig. 1, through a clutch 27. The shafts 37, 38, 39 are connected by bevel gearing and are driven from the gear 28 at a high speed by clutching the gear 43 to the shaft 42 driving the shaft 31 through worm gearing 41 or at a lower speed through the gearing 68, 56, change gearing 51, and worm drive 49 for the shaft of the gearing 41. The shaft 25 also carries a cam 29 for controlling the clutch 17, Fig. 2, a clutch controlled chain . wheel, 31, Fig. 1, driving through a shaft 68 a cam sleeve 62 loose on the shaft 37. The cam 64 operates an ejector 125, Fig. 2, and the cam 65 controls the opening and closing of the chuck. The ejector may be replaced by a feed device. A clutch controlled cam 33, Fig. 1, on the shaft 25 controls the high and low speed drive for the other cam and shaft through the clutch 67, and a clutch controlled pinion 35 drives Geneva mechanism 93, Fig. 7, for widening the turret, the stop being controlled by a cam 100. Cams 61 and 66, Fig. 1, on the shaft 37 control the movements of front and rear tool slides through bell cranks that operate sliding rods 109, 120, Fig. 5, acting as racks through adjustable abutments 105<SP>1</SP>, 188<SP>1</SP>, these racks transmitting motion to the slides through the pinions 106, 119, and racks 107, 121. A pin engaging an adjustable slotted member 112 feeds the tool 111 inwardly and outwardly during the movement of the slide 102 according to the slope and shape of the slot. The base slide 101 is fed transversely by a rack and sector operated by the cam 73 on the shaft 38 and the cams on which control the clutches on the shaft 25. The turret is fed axially of the lathe by a rack bar 88, Fig. 7, operated by a sector from the cam 85, shaft 39, and adjustably connected to a slide 89 connected to a crank 92 on the spindle of the Geneva mechanism 93. The cams may be in two parts, angularly adjustable to vary the effective profile. A member 120, Fig. 1, may be engaged by part of the ejector mechanism to stop the lathe after each cycle, and, on restarting, a fresh blank is fed from a magazine by the cam 72, shaft 38.