| 摘要 |
983,028. Change-speed gear; clutch control. J. REY. March 19, 1963 [March 20, 1962], No. 10838/63. Headings F2D and F2L. [Also in Division B3] A machine tool for turning, multi-spindle milling or grinding, tapping, reaming or drilling comprises a cylindrical support 1 carrying a number of machining heads 3, 4, 5 and an indexible chuck or work-table 6 carrying one or more workpieces. For turning, the table 6 is rotated at high speed by a motor 16 driving through change-speed gearing 14. For milling, a worm 26, Fig. 6, is advanced, by rotation of a threaded rod 33, into engagement with a worm-wheel 25, Figs. 3 and 4, to provide a slower rotation of the table by a motor 28. For indexing the table, a piston 44, Fig. 3, carrying a rack 48, is advanced by air pressure to rotate a pinion 49, Fig. 4, the rack being held against the pinion by a piston roller 50c. The advance of the rack is braked by a dashpot 60 having a control needle 65, Fig. 3. The table is locked by a projection 75, Fig. 5, engaging a notched disc 8 on the table. The projection is carried on a lever 70 operated by a spring 86 acting against oil in a jack 80. In the locked position, the lever 70 operates a switch 72 to start the machining operations. In a modification, the table is unlocked by a cam. |
