Method and apparatus for accurate measurement of imaging surface speed in a printing apparatus

摘要: According to aspects of the embodiments, there is provided methods and apparatus for sensing movement a moving surface by utilizing plurality reference patterns positioned on surface, using precision ROS Start Scan Clock, uses encoder MOB sensors. The are placed known number scanlines apart. sensor measure distance between patterns. Increase accuracy achieved sampling signal with Master Clock calculating fractional count at first last counts measurement. use provides speed measurement greater tolerance variations in dimensions belt thickness.