| 摘要 |
909,289. Automatic multi-spindle lathes. NATIONAL ACME CO. March 2, 1961 [May 27, 1960], No.7679/61. Class 83 (3). A multi-spindle automatic lathe has an indexible work-spindle carrier each spindle of which has a selective two-speed drive and a brake. The lathe may be adapted for bar or chucking operations, the latter embodiment is described with hydraulic cylinders 18, Fig. 1, for operating spindle chucks (not shown). The spindle carrier 13, Fig. 2, is rotatable about a drive shaft 15 rotated by an electric motor. The shaft 15 drives a gear 34 through epicyclic reduction gears for the slow speed and drives a pinion 25 directly for high speeds. These gears mesh respectively with gears 28, 27, on each of the spindles and drive is selectively engaged by individual spindle friction clutches 39, 37. Levers 41, rotatable about pivots 43, operate the clutches. The ends of the levers are provided with rollers which may be moved by forks 79 arranged at the indexed positions and operated hydraulically or by cams arranged inside the carrier-housing so that operation takes place during indexing. A friction brake on each spindle is similarly operated by levers 51 and rollers 52. Control of valves for operating the clutch and brake hydraulic gear is effected by solenoids activated by switches opened by cams on a shaft driven by the electric motor such that the cam-shaft rotates once during a complete cycle of the machine. |
