Browse Prior Art Database

Anti-Backlash Index Drive Mechanism

IP.com Disclosure Number: IPCOM000041733D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Krimm, DL: AUTHOR [+3]

Abstract

Index stepper or servo motor 10 has affixed to its face a motor-mounting bracket 12. The motor shaft mounts pinion 14. Bracket 12 is mounted to idler mounting plate 16 at three points, motor pivot 18 and sliding contact points 20 and 22. Motor 10 is free to rotate with respect to idler plate 16 about point 18. The fastening of bracket 12 is accomplished with a close-fitting shoulder screw or stud at 18, and similar fasteners with diametral clearance at 20 and 22. The fastener at 22 is affixed to motor plate 12 and has provisions for attaching bias spring 24. Idler plate 16 carries a stud 26 which provides axis of rotation for idler gear assembly 28. Gear assembly 28 has two members: gear 30 and pinion 32. Gear 30 is driven by motor pinion 14, while pinion 32 provides gear reduction to drive platen gear 34 about axis 36.

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Anti-Backlash Index Drive Mechanism

Index stepper or servo motor 10 has affixed to its face a motor-mounting bracket 12. The motor shaft mounts pinion 14. Bracket 12 is mounted to idler mounting plate 16 at three points, motor pivot 18 and sliding contact points 20 and 22. Motor 10 is free to rotate with respect to idler plate 16 about point 18. The fastening of bracket 12 is accomplished with a close-fitting shoulder screw or stud at 18, and similar fasteners with diametral clearance at 20 and 22. The fastener at 22 is affixed to motor plate 12 and has provisions for attaching bias spring 24. Idler plate 16 carries a stud 26 which provides axis of rotation for idler gear assembly 28. Gear assembly 28 has two members: gear 30 and pinion 32. Gear 30 is driven by motor pinion 14, while pinion 32 provides gear reduction to drive platen gear 34 about axis 36. Idler plate 16 is mounted to the frame at three points: idler pivot 38, 38' and sliding contacts 40, 40' and 42, 42'. Shoulder screws 44 provide freedom similar to motor/idler fastening. Spring 24 thus meshes the gear train 14, 30, 32, 34 to eliminate backlash between gears 14 and 30 and gears 32 and 34, as the gears are forced together to insure no backlash, thereby insuring correlation between motor motion and platen motion.

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