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On-off Servo Drive

IP.com Disclosure Number: IPCOM000097082D
Original Publication Date: 1962-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Raider, JW: AUTHOR

Abstract

Where bidirectional drive is required of a servo system, such is usually achieved by using either a reversible motor, or a unidirectional motor and reversing clutches. This device provides such rotative power through the co-action of a pair of mechanically linked differentials 10 and 11. The direction of rotation is controlled by selective settings of brakes 12, 13 and 14. Motor 15 serves as a prime mover, and it can, if desired, be maintained in a continuously running condition.

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On-off Servo Drive

Where bidirectional drive is required of a servo system, such is usually achieved by using either a reversible motor, or a unidirectional motor and reversing clutches.

This device provides such rotative power through the co-action of a pair of mechanically linked differentials 10 and 11. The direction of rotation is controlled by selective settings of brakes 12, 13 and
14. Motor 15 serves as a prime mover, and it can, if desired, be maintained in a continuously running condition.

Motor 15 directly connects to shaft 16 slidingly received through end gears 17 and 18 of differential 10. Spider gear assembly 19, consisting of cross shaft 20 fixedly secured to shaft 16 and a plurality of bevel gears 21 mounted for rotation on it, links rotative movement of gears 17 and 18. Similarly, differential 11 comprises a second set of end gears 22 and 23 rotatably mounted on output shaft 24 and mechanically coupled by a second spider gear assembly 25. A motion transferring relationship is established between the differentials by direct working contact of gear 17 with gear 23, and drive connection of gear 18 to gear 22 via idler gear 26.

Assume it is desired to rotate output shaft 24 counterclockwise and that motor 15 drives shaft 16 clockwise, both of which directions are taken from the right as illustrated. This is effected by energizing brakes 12 and 13 which release the shaft 24, in braked condition when brake 12 is de-energized, and immobilizes gears 18,...