METHOD AND DEVICE FOR OPENING MULTIPLE SHEET PRODUCT WHICH IS TURNED IN*FILED OR SEWN AND BOUND* PARTICULARLY* PRINTED MATTER

摘要

An entrainment cam, which is attached to an arm displaceable in its lengthwise direction, is moved toward an open side of a printed product which is to be opened. At the region of one corner of the product the entrainment cam engages a part of the printed product and entrains the seized sheets during further movement thereof. This results in a bowing-out or bulging of the entrained product sheets, so that the part of the printed product which is not engaged by the entrainment cam can be raised. In the thus formed gap there is inserted a holder element which supports the part of the printed product not engaged by the entrainment cam and in this way retains the gap open. Now the entrainment cam is moved back into its rest position where it does not have any effect upon the printed product. The latter then is forwardly advanced, in a direction essentially parallel to the product fold, towards a separation element which engages into the gap and completely opens the printed product.