Synchronizing control apparatus for electrophotographic apparatus utilizing digital computer

Abstract From the Canadian patent

The recording element of an electrophotograpic copier is provided with a plurality of equally spaced timing marks or other indicia along one edge thereof. Sensing means positioned adjacent to the path along, which the recording element is advanced during the electrophotographic copying process, act to sense the passage of the marks and to generate signals from which the position of each image area of the recording element can be accurately determined. The output signals from the sensing means are fed to a logic and control apparatus (e.g. a programmed digital computer) which controls the activation of the various processing stations in timed relation with the receipt of signals.