Regulated Speed Ribbon Drive
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
In a dual-motor drive system for ink ribbons of a printer one motor drags while the other is driven. In this system the stepping rate of the drive motor is periodically adjusted as the take-up reel diameter increases to allow more torque while maintaining the reserve torque almost constant. Basically, the drive system works by sensing the drag motor velocity which is directly proportional to the take-up reel diameter and using this parameter to regulate the stepping rate of the drive motor.