Improvements in or relating to lathes

摘要

816,503. Lathe-details. MASCHINENFABRIK HEID A.G. July 13, 1955 [July 21, 1954; Nov. 16, 1954; Feb. 18, 1955], No. 20281/55. Class 83 (3). A lathe comprises a headstock carrying a single horizontal work-spindle 7, Fig. 4, ard a bed 1 provided with front and rear longitudinal slideways along which a saddle having an upper guide-surface (represented by XX) is longitudinally movable parallel to the work-spindle axis, with said upper guide surface moving in a plane, the spindle being adjustable parallel to itself between two positions 7, 71, relative to the bed, in the second 71 of which the axis of the spindle is positioned both further above said plane and also further rearwards of the front slideway of the bed than it is in the first position. The headstock proper may be rotatable in a cylindrical bore in a housing, and the workspindle arranged eccentric to the bore to give an arcuate adjustment as above, or the headstock may be pivoted to give the adjustment. In an alternative arrangement, Fig. 2, the headstock 10 with its spindle 7 is adjusted along a wedgepiece 13 by a screw-and-nut gear 63, 61. The tool-holder is moved to a higher position 31 to correspond with the work-spindle in the raised position 71. In a further arrangement, Fig. 9, the saddle guideways 46 are arranged at different levels so that the saddle slopes downwardly towards the rear of the lathe. The headstock is adjustable horizontally on transverse guides 52, the relative effect being to move the work-spindle 51 rearwardly and upwardly as regards the upper guide-surface 49 of the saddle. The effect of all the arrangements is to increase the effective " swing " of the lathe.