SPEED SENSING SCHEME FOR MOTION CONTROL
Original Publication Date: 1992-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
In high quality and grey level printing systems, accurate control of the relative motion between the print media and the marking device is critical. A number of such printing systems employ encoders or equivalent devices to monitor the motion. In operation, the encoders generate short pulses indicative of the incremental relative motion being monitored. Moreover, the relative speed may also be monitored by timing the pulse intervals, to determine an average speed over one or more intervals. The response of these monitoring systems, and hence the accuracy, may be improved by shortening the intervals. Unfortunately, this usually requires more expensive encoders.