GB257200A - Improvements relating to automatic releasing gear for machine tools - Google Patents

Abstract

257,200. Sch³tze, M., and Wotan- Werke Akt.-Ges. April 20, 1926. Driving machines, - An automatic stop for machine tools comprises a reverted gear train 1 - - 4, the last wheel 4 of the train being loosely mounted on the driving shaft 1, while the second shaft 3 is mounted in a carrier 17 which is normally held stationary by a roller on a spring plunger 19 but which, when the wheel 4 is stopped, rotates about the shaft 1 to cause the disengagement of the drive. The wheel 4 actuates the driven shaft 14 through spur gearing 6, 7, bevel gearing 8, and worm gearing 12, the worm 12 being mounted in a swinging bearing 16 and held in engagement by an eccentric pin 28 which is mounted on a lever 15 and engages a slot in the worm bearing. The carrier 17 is provided with teeth engaging a wheel 22 which is loose on the shaft of the lever 15 and is slotted to receive a pin 23 on the lever. In operation, when resistance to the movement of the shaft becomes excessive, the wheel 4 is stopped and the carrier 17 then moves around the shaft 1, thus rotating the wheel 22 until the pin 23 actuates the lever 15 to swing the bearing 16 and disengage the worm drive. In a modification, Fig. 5, the driven shaft 24 is coupled to the loose bevel wheel 10, driven from the shaft 1 as described above, by a clutch 27 operated from the lever 15 through further levers 25, 26. In this form, when the shaft 24 is stopped, the planetary movement of the carrier 17 which ensues actuates the lever mechanism to disengage the clutch 27.