A device for periodically reversing the direction of rotation of a rotary drive for the average of three concentric bearing races of a bearing

摘要

1,153,921. Bearings. SPERRY RAND CORP. 19 July, 1966 [22 July, 1965], No. 32367/66. Heading F2A. [Also in Division G1] A bearing 12 comprises inner, intermediate and outer races separated by balls, and means rotating the intermediate member in one direction through a first angle and in the other direction through a second angle different from the first angle. Fig. 5 shows the pulse train supplied to a motor 33, Fig. 4 driving the intermediate race. A predetermined number of reversals of the race, i.e. seven in Fig. 5, comprises a half cycle, alternate half cycles being reversed. In Fig. 4, there are two bearings 12, 13 the intermediate races of which are driven in opposite direction by motor 33. A dual preset counter 15 counts a number of pulses on to channel A while motor 33 operates in one direction and turns the races through a first angle. At the end of counting a pulse triggers flip-flop 30 which actuates relay 31 to reverse the motor 33. Channel B of counter 15 then makes a count and motor 33 is again reversed and a pulse is sent to counter 26. After seven pulses have been received by counter 26, flip-flop 28 is triggered and relay 23 makes counter 16 effective for the next half-cycle. In Fig. 6 (not shown), intermediate races are driven at different speeds.