Abstract: A device which provides an economical means for coating offset plates on one side with a solvent based coating. An offset plate is advanced along a feed table by a suction belt toward a roller assembly consisting of a fountain roller, a metering roller, a coating roller and an impression roller. The fountain roller transfers liquid from a supply of coating liquid to the metering roller which transfers a predetermined amount of liquid to a moving plate by the coating roller. The impression roller forces the plate into engagement with the coating roller. A photoelectric sensor detects the leading edge of the plate as it moves through the roller assembly and moves the impression roller toward the coating roller to begin the coating application. The sensor detects the trailing edge of the moving plate and retracts the impression roller to stop the coating application. The speed of the feed belt, discharge belt and rollers are synchronized to accurately control the thickness of the coating applied to the plate.

Abstract: A reciprocating carrier-type photocopy machine having a photoelectric sensor for controlling a copy paper cut-off knife, to conform automatically the size of the copy paper to the size of the original document. A light emitter and photoelectric sensor are mounted beneath a glass platen over which a carrier, which contains the original document, moves for exposing the document to the reproducing mechanism contained beneath. An elongated rectangular mirror is mounted on the bottom surface of the carrier lid for reflecting the emitted light back to the sensor. The original document, when placed in the carrier, blocks the emitted light from being reflected from the mirror to the sensor until the trailing edge of the document passes the emitted light. The reflected light, upon passage of the document, then actuates the photoelectric sensor, which in turn actuates a solenoid of a copy paper cut-off knife to sever the copy paper from its supply roll.