Arrangement for detecting movement of medium for printing or copying system, detects magnitude of movement from successively stored pattern images and outputs corresponding signal

摘要

The arrangement has an optical sensor (SO) next to the medium (3) that deflects light onto the medium and stores images produced by light reflected from a pattern on the medium depending on sampling clock whose magnitude is such that several mutually shifted images are stored for the moving medium An evaluation circuit (6) detects the magnitude of the movement of the medium from successively stored images and outputs a corresponding actual signal.