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Print Band Height Control Servo

IP.com Disclosure Number: IPCOM000060960D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Melnyk, G [+details]

Abstract

The servo control for maintaining a selected print band height can be made less sensitive to height variations by requiring a predetermined count accumulation before permitting servo response to an out-of-limit condition. Referring to Figs. 1 and 2, endless print band 1 is constantly driven on flat drive and crowned idler pulleys (not shown) and passes through transducer 2 that senses the height of the lower edge of the band. A reversible motor is connected to the idler pulley shaft to adjust the pulley height and, hence, the band. Transducer 2, which may be a magnetic sensor, provides an analog output signal to sensor circuit 3 that energizes line A or B, indicating that the band is either too high or too low, respectively.