Patent GB-191510830-A (GB)
IPC: B23B7/04
Abstract: 10,830. Cone, F. L. July 26. L a t h e s .- Singlespindle tool - turret lathes, of the type in which the cam shaft is driven either directly from the main spindle by gearing independent of the spindle or by gearing from the spindle, are arranged so that the spindle may be reversed by means directly actuated from the cam shaft without reversing the cam shaft itself. Clutches, which take up the drive without shock, are provided. Specification 101,599 is referred to. Driving-gear; rewersing-mechanism. - The belt pulley 67, Fig. 7, has an oil - throwing flange 310 running in a hood 311, which delivers the stray lubricant to the bed of the machine. The first - motion shaft 66 drives a co-axial shaft 71 through a pinion 68 meshing with a number of planetwheels 69 carried by a sleeve 72 and meshing with an internal wheel on the shaft 71. When the sleeve is connected to the shaft 66 by a friction clutch 75, the gearing runs solid, but when the sleeve is locked by a screw 79, the shaft 71 is driven in the opposite direction at a reduced speed. Changegearing 92, Fig. 12, transmits the drive to an intermediate shaft 93 carrying a pair of wheels meshing with wheels loose on the main clutch shaft 98 carrying a further pair of loose wheels meshing with wheels on the back-gear shaft 103 geared at 350 to the spindle gear 61. Four speeds are thus provided, controlled by clutches, on the shaft 98, constructed as combined friction and positive - drive clutches to provide for starting without shock. Movement of a clutch sleeve 117, Fig. 14<b>, first operates the parts 120, 121 to expand a ring 116, and then brings driving-pins 119, 111 into engagement. The pins 119 are spring-mounted, to avoid damage in the event of end-on contact. The shaft 98 has recessed ends running on pins 108, 109. When these are withdrawn, the shaft, with its gears and clutches, may be removed bodily from the gear-box. Feed-motions, tool.-The cam shaft 62, Fig. 6, is worm-driven from a shaft 143 driven at the right-hand end from the spindle, and at the left-hand end direct from the main shaft. The drive correlated to the spindle is obtained by worm gearing, from the back-gear shaft, driving through a train of wheels carried in part by a hand-lever 159 and including a wheel 160 mounted on the shaft 143 by means of a roller ratchet clutch, thereby permitting the shaft to overrun when the direct drive is operative, and preventing the cam shaft from being reversed when the spindle reverses. The lever 159 provides for disconnexion of the train. The direct drive is taken from the main shaft at 164, Fig. 7, and passes by belt to a shaft geared at 182, Fig. 26, to a wheel 184, which drives the shaft 143 either through a friction clutch 185 or through a differential gear 189, Fig. 6, when anchored by a pawl engaging the wheel 389. The form tool slide 400, Fig. 3, is fed by a cam-lever 402 having screws engaging a fixed abutment 404 and an adjustable abutment 405. The sliding tool-holders 54, Fig. 2<a>, on the turret carry pins which engage, when in operative position, with a lug 304 on a slide bar passing axially through the turret and reciprocated by a cam-drum. Cutting-off mechanism ; lever rests.-The parting-tool is carried by a lever 410 pivoted at 411 and actuated directly by the cam shaft. Turrets.-The turret is rotated by a worm 226, Fig. 12, normally maintained in position by a spring 227 and mounted on an axially movable shaft having a clutch part 216 coacting with a part 213 driven at 211, Fig. 26. A spring 218, Fig. 12, normally maintains the clutch disengaged. A lever 222, controlled by the cam shaft, effects the closing of the clutch and the withdrawal of the index bolt 224, which runs on the cylindrical part between the notches and maintains the drive until it snaps into the next notch. Lubricating and cooling cutting-tools and work.-The oil pump is driven by a chain from a sleeve on the shaft 210 driven at 230, Fig. 26. Clutch-operating and speed-controlling mechanism.-The screw 79 is formed with a pinion 80, Fig. 7, meshing with a rack-bar controlled by the lever that operates the clutch 75 and is mounted on a rock-shaft having an arm adjustably positioned between screws on an arm on a second rock-shaft operated by the cam shaft. The clutches on the shaft 98 are controlled by levers on rock-shafts linked to levers adjustably mounted on rock-shafts controlled by the cam shaft, the cams having a stepped surface to produce the dwell required during the closing of these clutches. The clutch 185 is controlled by a lever 1186, Fig. 6, linked at 191 to a lever 320 for hand actuation, and to a lever 194 for actuation by the cam shaft. The pawl for the wheel 389 is normally held inoperative by a weighted arm, but is brought into action by a spring connexion to a lever 200 controlled by the cam shaft. Frames and standards; cuttings, catching and removing.-The framing is made to enclose totally the operative parts, additional pivoted hoods being provided where necessary, for example to enclose the cutting-off and forming mechanism. Cuttings are excluded from the slot which permits the movement of the lever rest 410, by a slide 413, Fig. 3, which closely fits the lever. The gear-boxes for the spindle change-speed gears, and for the feed-gears, Fig. 26, are detachable from the main frame and are built up as separate units, the same unit being available for a range of sizes of machine. Where necessary, couplings are provided on shafts and detachable links on clutchoperating gear. Inspection covers are provided to afford access to change-gears, dog-wheels, &c.