Patent GB-456284-A (GB)
Title: Improvement in automatic lathe
IPC: B23B9/02
Filed: 1935-05-02
Abstract: 456,284. Lathes. CONE, F. L., 129, State Street, Windsor, Vermont, U.S.A. May 2, 1935, No. 13124. Convention date, Jan. 28. [Class 83 (iii)] A lathe, particularly a multi-spindle automatic is provided with a main cam drum which is formed in sections detachably secured together and to the cam-shaft so that the cam drum may be replaced by one having a different set-up without disturbing the cam-shaft. The bed 1 carries hollow standards 2, 3, connected together by an upper frame 4. The work turret 5 located in the standard 2, comprises a spider 10 having end plates 11, 12 and intermediate protection 13, and is journalled in members 14 .. 16 enclosed in the standard 2. The four work spindles 6 may be formed as described in Specification 144,329, [Class 83 (iii)]. A central shaft 25 in the work turret carries a gear 26 engaging gears on the spindles and is coaxial with a shaft 30 driven from a motor 46 through a belt 46a and other gearing The tool slides include a slide 50 movable axially of the spindles and one or more upper slides 51 moving on guide bars on a bracket 53. The slides 51 are connected by adjustable links to levers 64 pivoted at 65 and operated by a cam drum 70 on the main overhead cam-shaft 220. Slide 50 is connected by a link 75 to an upper arm 77 of a U-shaped member pivoted on a vertical axis at 79, 80, and actuated by a cam 83 on the drum 70. The movements of slide 50 are cushioned by a dash-pot cylinder 85, Fig. 3, in which works a piston 86 secured to the slide. Similar dash-pots are provided for the upper slides. The machine also has front cross tool slides 100, 101 and rear cross slides 102, 103. A vertical rock-shaft 120 carries a hub connected by a link to the slide 101 and the rock-shaft carries an upper hub member 121 connected by a link 155 to a slide 163 actuated by a cam 1640 on the drum 70. A sleeve 130 on the rock-shaft is similarly connected to the slide 100 and is connected by a link 156 to a slide actuated by a cam 1610. The slides 102, 103 are similarly actuated. The cam shaft 220 is mounted in bearings 221 .. 224 on the upper face of the member 4. Each of the cam drums 70, 162, is formed in two sequential sections. Thus the drum 162 consists of sequents having hub portions 230, 231, which are tapered to crack with continuous clamping rings 233, 234 which are forced inwardly to secure the segments on the shaft by bolts 235 engaging in flanges 236 of the drum. One of the segments may be keyed to the shaft at 237. A two-speed drive for the cam shaft is provided. The Specification as open to inspection under Sect. 91, describes also a stock supporting reel which forms the subject-matter of Specification 454,472. Each cross slide is fitted with a bracket carrying four independent stop screws 184, Fig. 14 (Cancelled) coacting with a stop element 183 carried by a link 180 which is moved at each indexing movement by a series of cam segments so as to position the stop 183 to co-operate successively with the screws 184. The motions of the crossslides are also cushioned in both directions. The stop brackets 189, Fig. 16 (Cancelled) are extended to receive a screwed sleeve 200 through which passes a rod 201 having a spring mounted between its head and a collar 209. As the tool slide moves inwards the inner end of sleeve 200 engages the collar 209 and impresses the spring to cushion the movement. The sleeve 200 engages abutment nuts 211 to cushion the outward movement of the slide. The high speed of the cam shaft is derived from the shaft 42, Fig. 8 (Cancelled), through a clutch 285, Fig. 18 (Cancelled) bevel gearing 282, and worm gearing 280, 254, a shear pin being included in this drive as a safety device. When this pin is sheared a clapper carried by a pin 271, Fig. 19 (Cancelled), in the worm wheel 254, Fig. 8 (Cancelled) is actuated to strike successive blows on a thin flange 253, and warn the operator. The clutch 285, Fig. 18 (Cancelled), is controlled by a collar operated by a shifter arm 288. When the clutch is released an extension of the shifter arm actuates a braking member 295 to check the cam shaft. The clutch may be controlled manually from a handle 297 or automatically from a cam 2980 on the main cam shaft. The low cam shaft speed is derived from the shaft 30 through link belt gearing 302, spur gears 304, and worm gear 307 coupled to the shaft 281 through an over-running clutch 308 which takes up the drive when the high speed is disengaged. The belts 302, 37 are tensioned by adjustable shoes 310, 311, Fig. 8 (Cancelled). The cam shape may be rotated manually for setting up by a hand wheel 316 or by a similar hand wheel 325 on the opposite side of the machine. The cam shaft also operates the chuck opening mechanism, the stock feed mechanism, the work stop and the turret rotating and locking mechanism. The turret is normally locked by a pin 351, Fig. 12 (Cancelled), pressed into notches of the turret by springs 353 and movable in guide members 352. The pin is slotted to receive one arm of a lever 361 which is actuated to withdraw the locking pin by a cam 363. The pin may also be released by a manually operated cam 364. Indexing is effected from the camshaft through a gear 480. Fig. 3, driving through intermediate gearing an arm 483, Fig. 2 (Cancelled), coacting with Geneva slots 485 in the end wall of the turret. The work stop is actuated from a cam 368 which operates an arm linked to a rock-shaft 376 carrying the adjustable workstop 381, Fig. 3, which is thus positioned opposite the fourth spindle just before feed occurs. The chucks are actuated by cams 400 operating slides 402 which are normally urged by springs, Fig. 3, so that a lug 410 engages successively between lugs on slides 413 each provided with an arcuate lug 420 engaging chuck operating means 426 of the kind described in Specification 144,329. The chucks are kept closed at the non-feeding stations by an arcuate rib. When the stock is unclamped it is fed by cam 430 which operates a bar slidable in a member 436, Fig. 4 (Cancelled), carried by a bar 437. The block 436 carries a bell-crank 452 one arm of which has a roller 454 recessed to engage the head 456 of a feed tube so that when the block 436 is actuated the bar in the corresponding spindle is fed. The bell-crank lever 452 may be swung about a pivot 451 to permit withdrawal of a feed tube for inserting a fresh bar. To cushion the feed motion the block 436 is bored to receive a fixed dash-pot piston 471. This subject-matter does not appear in the Specification as accepted.