Edge method of detection null of fold section

摘要

PURPOSE: To surely detect the end margin of signature printed matter by allowing the end margine of the signature printed matter to pass, deformed to a bent state from a nearly straight state, and by detecting the deformation of the end through the variation of the light of a reflection type photoelectric sensor. ;CONSTITUTION: Signature printed matter is sent out in the superposed deflected state from a rotary printing press machine. When the end of the folded printed article which is transferred in the superposed deflection state reaches a prescribed position, the paper sheet passes, deformed to a bent state from a nearly straight state. At the end of the folded printed article in the deformed state, a reflection type photoelectric sensor 60 is directed, and it detects the variation of the distance between the front end at the center part of the signature printed matter which is bent downward from the nearly straight state and the relection type photoelectric sensor 60 through the variation of the reflected light. The variation of the reflected light is converted to the variation of voltage, and compared by a comparator, and pulses are generated in case of a certain voltage or more. Accordingly, the passing of the front end at the center part of the signature printed matter can be detected.;COPYRIGHT: (C)1995,JPO