Patent GB-411516-A (GB)
Title: Improvement in double end automatic lathe
IPC: B23B9/08
Filed: 1932-12-07
Abstract: 411,516. Automatic lathes ; chucks. CONE, F. L., 129, State Street, Windsor, Vermont, U.S.A. Dec. 7, 1932, No. 34692. Convention date, Dec. 9, 1931. [Class 83 (iii).] An automatic lathe comprises a rotatable turret, work-holders arranged circularly about the axis of the turret, work-gripping means at each end of such work-holder, means for indexing the turret, and means for simultaneously locking or releasing work at both ends of each holder when it is in one indexed position. In the construction shown, four workholders are carried by a turret 15 provided with a horizontal shaft 16 extending from an end plate 17 to a disc 19 journalled in an end standard 3. The disc is provided with pairs of bars 20 adapted to be engaged by a roller 21 on a crank arm 22 whereby the turret is indexed. The turret may be locked in each position by a spring-pressed pin adapted to be retracted by means including a cam on a shaft 28. The end plate 17 is connected by spaced bars to a second end plate 30 mounted to rotate on a shaft 35 in alignment with the shaft 16. The shaft 35 is connected to a shaft 36 adapted to be driven by an electric motor 100. A gear wheel 40 on the shaft 35 meshes with four gear wheels 61, each mounted on a slidable sleeve 55 forming part of a work-holder. Within the sleeve is a tube 50 provided at each end with spring collets adapted to grip the work which extends from both ends of the tube. The collets at one end are engaged by a sleeve 75 keyed to the sleeve 55 and resiliently connected thereto by a bolt 89 and spring 85. The spring tends to draw the sleeves together and release the grip of the collets. The sleeves are separated by means of a bell-crank lever 73 with a roller 72 co-operating with a cam face 70 on a portion of the gear wheel 61. This wheel is slotted for engagement by a finger 96 when the work-holder corresponding to the gear wheel has been indexed to a certain position. The finger 96 is carried by a bar 97 which is actuated by means of a cam drum 98 on a cam shaft 28. This shaft may be driven at high speed through the medium of gearing carried by shafts 113, 108, 103, Fig. 4, or at low speed through gearing carried by shafts 113, 142, 137, 36. The shaft 36 is driven from the shaft 103 which in turn is driven by a belt drive from the electric motor 100. The high speed drive becomes effective when a clutch 112 on the shaft 113 is closed, the clutch being actuated either manually or automatically through cam means on the shaft 28. The shaft 142 carries a worm 143 gearing with a worm wheel 144 which is connected through a slip joint at 145 and through an overrunning roller clutch 146 with one element 147 of a friction clutch, the other element being keyed to the shaft 113. When the clutch 112 is opened the high speed of rotation of the shaft 113 is reduced by means of a band brake 150 to the speed of rotation imparted by the worm gear 144 and the friction clutch. This clutch may be opened or closed manually or automatically through cam means on the shaft 28. The worm wheel 161 may be secured directly to the shaft 28 or through a slipping clutch connection in which a sleeve member keyed to the shaft and having one or more bevelled faces is pressed by a spring or secured adjustably against corresponding faces on the worm wheel. The lathe is shown in operation on the rear axle of an automobile, the tools used thereon in three indexed positions of the turret being shown in Figs. 23, 24, 25 respectively. At the first station of the work-holder where the work is inserted or removed a work stop 240 is provided having a roller to engage the end of the work. At the second station the work is operated on at the front end by tools 285, 286 carried by a holder 204 fixed to a longitudinallymovable slide 201, and by a transverselyreciprocating tool 216<a>. At the other end the work is formed by longitudinally-sliding tools 256, 257 and a laterally-moving tool 260. At the third station the front of the work is faced by tools 305, 306, 307 carried by a holder 203 fixed to the slide 201, while at the same time forming tools 308, 309 on a laterally-movable slide 310 turn side portions of the work. The work at the other end is drilled by lathe centre drill 290 driven from a motor 293, the drill head 291 and motor being carried by a support 294 fixed to a slide 259. The support also carries a turning tool 296 moving axially with the drill. A laterallvmoving turning tool 300 acts on the side of the work. At the fourth station the front of the work is operated on by a forming tool 330, a lathe centre drill 230 and a necking tool 332. The necking tool, Figs. 12 and 13, is carried by a lever 333 fulcrummed on a pin 334 and slotted at 336 to accommodate a stud 337 with a stop nut 338. A spring 340 tends to keep the necking tool up. A cam 341 having a wedge face 342 is fixed to the slide 310 and engages an adjustable cam follower 345 on the lever 333 so that as the slide approaches, the necking tool is swung downwardly. At the opposite end of the work a forming tool 320 is in operation, the tool being carried by an overhead longitudinal slide. The movement of the tools is affected by the cam shaft 28 through the medium of cam followers connected to the tool slides and engaging cam drums on the shaft. Specification 144,329, [Class 83 (iii)], is referred to.