To prevent a laminated paper from being peeled and deviating of a position to a lithographic printing plate by air jetted by an air jetting means even when intervals for feeding the lithographic printing plates by a conveying means become long.

On the lithographic printing plate 46 fed from a belt conveyor 42, its one side end part 47 runs on the inclination part 63 of a guide member 54 and high pressure air is blown thereon from air nozzles 59A-59E. The lithographic printing plate 46 is.moved to a side stopper 50 side and is registered to an accumulating position by means of the side stopper 50. In this time, when the interval between the lithographic printing plates of the (Nth) sheet and the (N+1th) sheet brought about by the belt conveyor 42 exceeds a preset time T, blowing of the high pressure air from the air nozzles 59A-59E on the lithographic printing plate 46 is stopped until the lithographic printing plate 46 of the (N+1th) sheet is started to be fed. It is possible thereby to prevent the laminated paper 22 stuck on the lithographic printing plate 46 from being peeled and deviating of the position.