Patent GB-1252503-A (GB)
IPC: B23B3/18
Filed: 1969-08-15
Abstract: 1,252,503. Automatic turret lathes. HARDINGE BROS. Inc. 15 Aug., 1969 [13 Sept., 1968], No. 40877/69. Headings B3B and B3T. In a machine tool such as an automatic turret lathe means is provided to control the indexing of the turret 36, the stroke of the turret slide 38 and the movement of the cross slides 203 (Fig. 20, not shown) in a predetermined interrelated sequence in relation to the operations to be performed on a workpiece. The turret slide is actuated by a pair of hydraulic pistons and cylinders 102, 100, to effect a controlled forward and backward movement which also effects the indexing of the turret by way of a pawl-and-ratchet mechanism 52 and sequential actuation by lever 60 of the turret locking bolt 44. The rotational indexing of the turret 36 effects by way of gears 48, 49, 51, 68 and shaft 70 corresponding indexing of a stop drum 74 in the turret slide support 34 which has individually adjustable stops 81 which can control the overall stroke of the turret slide for each index position. The turret slide 38 carries axially extending rods 87 which support a stop switch housing assembly 92 which moves with turret slide to abut the selected operative stop 81 in the stop carrier. The assembly 92 abuttingly co-operates with a fluid-actuated axially movable shaft 502 of a main reciprocation unit 500 which controls, by progressive predetermined displacement of the shaft 502 the progressive stepped forward movement of the turret slide during each respective reciprocation thereof during the machining of the workpiece in one index position. The repetitive progressive movement of the turret is determined by the preselected position of cam rings 514 mounted on the end of shaft 502 and which sequentially co-operates with a switch 6LS in the unit 500. Attached to the slide support 34 is a feed cam and switch enclosure unit 114 and a programming unit 135, the operative cam parts of these units being indexable in unison with the stop carrier by way of gears 118, 117 and 141, 140, 139 respectively, whereby the selected switch actuation in the unit 114 and the movement of the cams 145 and 151 effects a required sequence of movements of the turret, the stroke of the turret slide being already programmed by the cam selection of the unit 500. The cams 145 are adjustable axially with respect to the shaft 136 on splines so as to be selectively co-operable with any switches 1-8 CLS, these switches effecting the selection of the required function to be performed by both turret and cross-slides. The cams 151 are similarly adjustable and for selected cooperation with a roller attached to a slide rod 154 which is movable with the turret slide 38. The axial movement of the rod 154 and its rotary movement effected by co-operation between the roller and respective selected cams actuates switch 3LS which controls the fast and slow feeds of the turret during its traversing movements. By the selection and adjustment of the cams in the various operative units a preset cycle of operation may be effected for each indexable position of the turret and incorporating the operation when necessary of the cross-slides. Electrical and hydraulic circuits are described in relation to Figs. 28, 29, 30 (not shown). (For Figures see next page.)