| 摘要 |
1,082,311. Multi-spindle automatic lathes. ALFRED HERBERT Ltd. Jan. 22, 1965 [Jan. 23, 1964], No. 2915/64. Heading B3T. A multi-spindle automatic lathe comprises rotary work spindles 1-6 arranged around a shaft 7, and chucks 9, which are indexed, and moved axially, by a chuck carrier 10, to align the chucks with the spindles 1-6. All of the spindles except number 1 are driven by an electric motor through shaft 7 and a gear drive 8, and number 1 is used for loading and unloading the work. Carrier 10 is moved vertically on a column 18 between an upper position in which the chucks are disengaged from the spindles, and a lower position in which the chucks are driven by the spindles and disengaged from the carrier. The carrier is indexed in its upper position by a pinion 23 which cooperates with teeth 22 on the carrier, the pinion being rotated by a fluid motor 25 through a worm and wheel 33, 34. Carrier 10 is raised by applying oil pressure underneath a lifting ring 16, oil being also supplied between column 18, and the carrier, for lubrication purposes. Swarf is collected in an annular channel 28 and is prevented from entering housing 17, which contains compressed air, by flanges 26, 27 on carrier 10. A cam 35 and a stop 36 are keyed for rotation with indexing shaft 24, the stop being engageable with a plunger 39 so that the chucks are aligned with the spindles. Plunger 39 is urged away from stop 36 by a spring 42 and is engaged with the stop by a fluid-pressure piston 41. Cam 35 engages a lever 47 which actuates a fluid-control valve 49. Each chuck is clamped to a spindle after indexing by a fluid-actuated piston. In operation, motor 25 is actuated to move the clamping pistons so that the chucks are released from the spindles. Pressure fluid is supplied to ring 16 and the chucks are moved vertically, Fig. 1 (not shown). Shaft 24 is rotated, and fluid is supplied to plunger 39, which then moves inwardly against spring 42. Cam 35 actuates valve 49 to slow down motor 25, and stop 36 engages plunger 39 so that the chucks have then been indexed until they are coaxial with the spindles, whereupon fluid from ring 16 is exhausted. The chucks move on to the spindles and are clamped in the new position. The lathe may have horizontal spindles. |
