Patent ID: 8534192
Filing Date: 2013-09-17
Classification: B41F,Y10T

Abstract:
1. A printing plate cylinder forming a cylindrical shape and detachably mounted with a sleeve printing plate capable of increasing its diameter, the printing plate cylinder comprising a shaft portion rotatable about a central axis, a tubular portion formed cylindrically, arranged coaxially with the shaft portion, arranged at a distance from an outer circumferential surface of the shaft portion, and including an inside tubular portion and an outside tubular portion mounted on an outer circumferential surface of the inside tubular portion, and ribs fixed integrally to the outer circumferential surface of the shaft portion and an inner circumferential surface of the inside tubular portion and connecting the shaft portion and the tubular portion to form a gap region between the outer circumferential surface of the shaft portion and the inner circumferential surface of the tubular portion, wherein the tubular portion is formed with an air outlet hole open to an outer circumferential surface of the tubular portion, and at least one of the ribs has an air supply passage formed in the rib, the air supply passage has a first end opening at an end face of the rib and a second end communicating with the air outlet hole to supply air from the first end to the air outlet hole, and the gap region is opened to the outside at both axial ends of the tubular portion.