| 摘要 |
892,578. Copying lathes; machine-tool details. ERNAULT-BATIGNOLLES S.A., H. May 9, 1960 [May 11, 1959], No. 16277/60. Class 83 (3). A copying lathe or like machine tool has first and second supporting means for a templet to hold it with its axis generally parallel to the lathe axis, in which the first support, at the headstock end of the lathe, is thermally insulated from the machine base and is displaceable relative to the headstock to compensate for expansion and maintain the axis of the templet in parallelism with the spindle axis. The pattern 12, Fig. 1, is adjustably carried by arms 14 pivotally supported from a bar 15. The latter is mounted parallel to the workpiece in supports 13 and 29, Fig. 4, at the headstock and tailstock ends respectively, of the machine. The first support 13 may be secured at 18, Fig. 1, by its lower end, to the headstock frame with an air gap 17 for thermal insulation. An adjustable tie-bar 19 connects the upper end of this support to a point 20 forward of the spindle axis which is chosen so that heating up of the headstock and tie-bar compensates the changes in distance which would occur between the pattern 12 and workpiece with the support directly attached to the frame. In a modification, the support 13 is pivoted to the frame and a tie-bar passes underneath the spindle to the front of the machine. Compensation for temperature changes in the second support 29 may also be provided for. The support 29, Fig. 4, is then pivoted at 30 and a tie-bar 31 secured to the support is brought through the bed to an adjustable anchor 33 in front of the tailstock. |
