Optical scanning of a moving sheet of image-bearing material is carried out in a stand-alone apparatus. No drive is provided for the sheet in the scanning apparatus, and the sheet accelerates therethrough under its own momentum and under its own weight. Transmittance scans from an optical sensor are...http://www.google.fr/patents/US6304314?utm_source=gb-gplus-shareBrevet US6304314 - Determination of the speed of movement of an image-bearing sheet
Determination of the speed of movement of an image-bearing sheet
