GB1314287A - Indexing device for a machine tool - Google Patents

Abstract

1314287 Gear-cutting; indexing SKODA NARODNI PODNIK 7 Dec 1971 [10 Dec 1970] 56853/71 Headings B3B and B3K An indexing device 8 for a gear-cutting machine comprises a transmission shaft 114 driven by drive means 101, and carrying an arresting disc 104 having a recess which co-operates with a catch 105, and further carrying a cam wheel 103, a roller follower 106 biased by a spring 115 being arranged to be selectively engaged with the cam wheel, and to actuate means 7 for controlling the speed of means 101, shaft 114 driving a stop drum 110 via gearing 108, 109, and a shaft 113, stops 111 on the drum co-operating with switches 112 controlling the movements of the machine, and of elements of the indexing device. In operation, when grinding a globoidal worm 9, by a grinding disc 15, catch 105 is withdrawn from the recess of disc 104 by actuation of an hydraulic cylinder 118, and through a stop 119 withdraws follower 106 from cam wheel 103. A throttle valve 107 is simultaneously actuated so that pressure is supplied to hydraulic motor 101 and drum 110 is rotated so that a selected row of stops 111 is brought into the operating field of a switch 112. The latter causes catch 105 to enter the recess in disc 104, follower 106 is again pressed into engagement with cam wheel 103, valve 107 is gradually closed and the speed of motor 101 is reduced, and stops, when catch 105 is fully entered into the recess. The table 14 on which grinding wheel 15 is mounted is driven by a mechanism 1 through a gear-box 2 and a worm and wheel 4, 5, and the work blank 9 is rotated from mechanism 1, 2 through a differential gear 7, the latter being also connected to the indexing device 8.