Patent GB-144329-A (GB)
Title: Improvements in automatic turret lathes
IPC: B23B9/02
Filed: 1918-03-19
Abstract: 144,329. Cone, F. L. March 19, 1918. Lathes.-In an automatic turret lathe having a turret 49 carrying rotating work spindles 60, the cam shaft 84 for operating the various parts of the machine is placed above the turret 49 and the tool slides 41, 203, 204, on an upper bed, which also carries the operating-levers for the various parts. The shaft 84 is thus out of the way of chips, and is readily accessible. The lathe may be driven by an electric motor in the base of the machine, driving a pulley 131 through a belt. At the end of the lathe furthest from the work turret, the change-wheels and other transmission gearing are mounted, under a cover 139, and drive the spindles 60 through a shaft 75 concentric with the turret, and gearing 73, 74. Feed-motions, tool and saddle; cutting-off mechanism. - The cam shaft 84 is driven by a worm-wheel 344 and worm 147 on a cross shaft 1440 driven by bevel-gears 149 which are disengageable to stop the rotation of the shaft 84 by hand-operated means for longitudinally moving the shaft 1440. The shaft carrying the bevel wheel 149 is driven through gears 157, 158, from a shaft on a level with the shafts 84, 128, which may be driven at a slow speed through a pulley 168 coupled to it by a free-wheel clutch, and a belt 169 from the change-speed gearing &c. 172 &c., or at a high speed through a gear 166 on the shaft 128, engaging a gear mounted on a loose sleeve on the feed-shaft, to which it may be coupled by a clutch operated by a hand-lever 165. By removing the bearing-caps 124 and the covers 311, 312, &c., the cam shaft may be lifted bodily away from the lathe to change the cams. The saddle 41 carrying turning, boring, or other tools mounted on any suitable support such as the bracket 45, is operated by a rock-shaft 183 carrying levers 189, 185, the latter either having a tumbler 188 engaging a cam on the drum 182 or a pin-and-slot connexion with a slide bar carrying the tumbler 188. Similar rock-shafts, having levers 214, 215, Fig. 7, engaging the cam drums 222, 223 actuate the cross slides 203, 204 carry. ing the tools for turning or cutting off the work. Holes 225 in the levers 214, 215 are for the insertion of a bar for hand operation. Beds and frames; cuttings, catching and removing.-The upper bed 121 is rigidly connected to the lower bed 35 by an end support 76 carrying the indexing devices, the centre supports 52, 53 carrying the turret 49, and the casing 111 for the driving-belt. The portion 40 of the bed that carries the saddle 41 is arranged low enough to allow the saddle to pass beneath the projecting ends of the work pieces. A chip-receptacle, 34, open at one end, is formed as part of a standard for the lower bed or is made detachable. Gauging-devices.-The amount of projection of the work from the chuck is determined by a stop on the pivoted adjustable lever 230, coupled to the slide 203 by a link 237 having a slot 238 to allow for lost motion. As the slide 203 recedes, the stop is moved opposite the work which is then being fed forward. Spindles.-The hollow spindles 60 have drawspindle chuck-operating devices controlled by levers actuated either by a cam 246 or by hand. The stock is fed by a sliding adjustable lever which engages in turn collars 63 on the friction feeding devices in the spindles 60, and is mounted on a bar operated by the rocking lever 214. Turrets.-The turret indexing, locking, and adjusting devices and their actuation by the shaft 84 are described in Specification 144,109. Chucks.-Each spindle 60 has a tubular drawspindle 65 carrying at one end the bevel-closing jaws 64, and at the other end a bracket 69 for the bell-crank levers 66, the short ends of which bear against the spindle 60, when the long ends are engaged by the sliding bevel collars 68.