In a machine for cutting a paper web into sheets and forming them into a stack, the sheets are fed from the cutter to a primary conveyor on which they are spaced apart, and then to a secondary conveyor driven at a slower speed so that the sheets are overlapped, and finally fed onto the top of a stack....http://www.google.fr/patents/US4184392?utm_source=gb-gplus-shareBrevet US4184392 - Web cutting machines
