Apparatus for longitudinally perforating a web of paper in a rotary printing press

摘要

A rotary printing press has a folding station where the printed web (W) is perforated both transversely and longitudinally in order to expedite subsequent folding thereof into multiple-page signatures. In order to incorporate a longitudinal perforator (LP) into the folding station without adding to its size, a longitudinally perforating blade (11) similar to a circular saw is mounted to a blade carrier shaft (13) which is rotatably supported opposite a feed roller (1) by which the web is frictionally fed into and through the folding station. An annular, longitudinally grooved anvil (3) is formed circumferentially on the feed roller (1) for engaging the longitudinally perforating blade (11) via the web being thereby perforated longitudinally. The blade is movable with the blade carrier shaft (13) into and out of perforating engagement with the anvil (3) on the feed roller (1).