| 摘要 |
827,672. Automatic lathes; machine-tool details. PETZOLDT, F. G. J. E. Feb. 14, 1957 [Feb. 21, 1956], No. 5141/57. Class 83 (3). A multi-spindle automatic lathe comprises a central shaft supported along an intermediate portion in the lathe-frame, an indexible workspindle-carrier being mounted and supported on one of the free ends of the central shafts. The indexible work-spindle carrier 34, Fig. 2, is shown carrying four spindles driven from a central shaft 14 and gearing 47, 48, Fig. 3. Indexing is effected by a rotating arm 51 carrying a roller 52 adapted to engage slots 53 in the end of the spindle carrier. The latter is locked in the indexed positions by a radially-arranged spring-pressed latch 54, which is lifted by a bell-crank 58 operated by a cam 49 on the shaft 50. The spindle - carrier comprises end flanges 36, 37, Fig. 2, joined by a boss 35, and is rotatably supported on the end of a hollow shaft 17. The latter is supported in a snoutlike member 15 forming part of the upper frame of the machine. The opposite end of the hollow shaft to that supporting the work-spindle carrier is used to carry a toolspindle support 23. The frame is arranged to form reservoirs 60, 61 for oil, one at the work-spindle end and the other at the tool-carrier end respectively. An oil-pump 63 draws the fluid from the interconnected reservoirs and passes it to a pipe, from which it is sprayed on to the two carriers for lubricating purposes, and also to maintain an even temperature between the parts of the machine. Two pumps may be used to transfer the oil from each reservoir to the opposite carrier. An alternative arrangement of the hollow support shaft provides for its rotation in the frame, with the work-spindle carrier fixed to it at one end. Means are described for taking-up end-thrust on the work-spindle carrier during machining, one method including spring washers 68, Fig. 2, and a conical-seating 39 in the frame for the end flange 37 of the carrier. An alternative method consists in a flange 95, Fig. 8, provided on the carrier and oppositely-disposed pairs of thrust-rollers 101, 102, mounted on adjustable eccentric-pins in the frame 91. |
