A machine for handling flat sheets employs a pair of conveyors in series to receive the sheets from a processing machine and to deliver them to a downwardly moving platform to form a stack thereon and to deliver the stack so formed. Both conveyors operate at a predetermined initial speed to deliver to...http://www.google.es/patents/US4805890?utm_source=gb-gplus-sharePatente US4805890 - Sheet stacking machine
