Device for advancing paper webs in printing mechanisms

Claim 1

IN A PRINTING MACHINE, A DIVICE FOR ADVANCING IN ONE ADVANCE DIRECTION A PAPER WEB PROVIDED WITH MARGINAL PERFORATIONS THROUGH A PRINTING MECHANISM, SAID DEVICE COMPRISING IN COMBINATION: A PAIR OF WEB DRIVING MECHANISMS DISPOSED, WITH RESPECT TO SAID ADVANCE DIRECTION, AFTER SAID PRINTING MECHANISM, AND BEING PROVIDED WITH STUDS ENGAGED IN PERFORATIONS OF THE WEB TO DRIVE IT; MEANS FOR INTERMITTENTLY ACTUATING SAID PAIR OF DRIVING MECHANISMS; WEB BRAKING MEANS LOCATED, WITH RESPECT TO SAID ADVANCE DIRECTION, BEFORE SAID PRINTING MECHANISM AND DIRECTLY ENGAGING SAID WEB TO BRAKE IT BY FRICTION; AN AUXILIARY DRIVING ROLLER LOCATED BETWEEN SAID PRINTING MECHANISM AND SAID PAIR OF DRIVING MECHANISMS TO DEFINE AN ANGLED FEED PATH FOR SAID WEB; AND MEANS FOR DRIVING SAID ROLLER IN CONTINUOUS ROTATION WITH A PERIPHERAL VELOCITY AT LEAST EQUAL TO THE MAXIMAL SPEED TO SAID WEB WHEN SAID DRIVING MECHANISMS ARE ACTUATED, A PORTION OF THE PERIPHERY OF SAID ROLLER ADDING A FRICTIONAL DRIVING FORCE TO SAID WEB AS LONG AS THE LATTER IS TENSIONED BY SAID ACTUATED DRIVING MECHANISMS.