GB985946A - Stopping device for automatic lathes - Google Patents

Abstract

985,946. Lathes. E. C. HAHN, [trading as INDEX-WERKE KOMM. GES.]. June 14, 1962 [June 15, 1961], No. 22975/62. Headings B3B and B3T. Means for stopping a lathe when the bar stock 38, fed by cams 30, 32, is used up comprises a switch &c. 40 which must be operated by the returning feed-device 25 before the machine can be stopped by a device 44. A reciprocating gripper 24 in the spindle and a release mechanism for the chuck 22 are operated through levers 34, 36 by the cam tracks 30, 32. A spring 48 acting on the lever 34 biases it in the return direction so that after the gripper 24 has slipped off the end of the stock, the feed-slide 25 is returned an extra amount by the spring and operates the initial switch 40. The extra movement is accommodated by a recess (not shown) in the track 30. The camdrum continues to rotate until an adjustable dog 42 on the drum contacts the device 44, which disengages a clutch in the drive and applies a brake. In a modification, Fig. 3, with an external feed gripper 50 and an auxiliary feed-rod 58 which may be swung into position to continue the feed after the gripper 50 has slipped off the rod, a further conditioning switch 64 is operated by a collar on the feed-rod at the end of the supplementary feed. The machine is then stopped when the dog 42 encounters the device 44.