GB367311A - Improvements in or relating to the positioning and locking of turret-heads in lathes and like machine tools - Google Patents

Abstract

367,311. Turning. HAHN, H., HAHN, O., and TESSKY, K., (trading as INDEXWERKE, HAHN & KOLB), Esslingen-on- Neckar, Germany. Sept. 22, 1931, No. 26413. Convention date, Sept. 22, 1930. [Class 83 (iii).] In a turret-head for machines such as automatic lathes wherein the locking bolt is operated by a cam, the cam has two or more tracks, any one of which may b e adapted to actuate the bolt so as to vary the number of stations which are utilized in the turret. A constantly rotating shaft 3, Fig. 1, is adapted to rotate the turret through a Geneva wheel 16 and a clutch 1, spur gearing 4, bevel gearing 6 and a pin 9 on the disc 8. The Geneva wheel has six radial slots but when three or two stations only are required on the turret, additional pins 17, 32 are added to the disc 8. The locking bolt 13 is actuated through a lever 12 from a cam 10, Fig. 4, attached to the disc 8, the cam having two or more tracks 18, 19 of different lengths so as to hold the bolt away from the turret for a variable time according to the number of turret stations used. The cam-follower 11, Fig. 5, on the lever 12 is stepped at 20 and is rotatable about its securing bolt 21 so as to be engageable with the different cam tracks. In a modification the follower 11, Fig. 8, is arranged parallel to the axis of oscillation of the lever 12 and is retained in position by a spring 27 but may be displaced axially and rotated by a key recess in the end of a handle 23 which is normally retracted by a spring 24 and is rotatable in the casing 22 of the turret mechanism. In a further modification, the follower 11, Fig. 11, is axially displaceable by means of a hooked end on a handle 31 and is retained in the adjusted position by means of a spring detent 30 and notches 28, 29 in the follower.