| 摘要 |
1,261,502. Multi-spindle lathes. WERKZEUGMASCHINENFABRIK GILDEMEISTER & CO. A.G. 26 Jan., 1970 [27 Jan., 1969], No. 3664/70. Heading B3T. [Also in Division F2] In a multiple spindle automatic lathe in which the spindles 11 are carried in a spindle drum 12 each spindle is mounted in bearings constituted by pressure pads 131, 141 which co-operate respectively with conical surfaces 112, 111 at each end of the spindle, the pads being located in sleeves 13 and 14 respectively the pad 141 with its sleeve 14 being urged into engagement with the conical surface 111 by spring discs 15 which are biased against the drum 12, the springs permitting a predetermined load to be applied to the pads 131, 141 and their respective conical surfaces, the spring bias being adjustable by a ring nut 16 surrounding the spindle and engaging a threaded ring secured to the drum. Adjacent the sleeve 14 and pad 141 is an annular cylinder 22 and piston 21 which abuts the sleeve 14 whereby when pressure fluid e.g. oil is supplied to the cylinder 22 the piston is displaced and causes axial displacement of the sleeve 149 the pads 141 to relieve the pressure from the conical surface 111 and hence the conical surface 112 at the other end of the spindle. The control of the pressure fluid supply is effected from a distributer, mounted at the rear of and coaxially with the spindle drum 12, and comprises a bush 25 and a control piston movable therein, the bush being secured to a central member 27 which in turn is attached to an indexable control wheel 28. Fluid under pressure controlled by a three way valve 43 is supplied to the piston and by way of selected conduits is supplied to the spindles in dependence on the operational loading requirement whereby improved static and dynamic stability of the spindles is achieved. The construction indicated in Figs. 4-7 (not shown) is described with reference to an eight spindle lathe. |
