To increase an operating efficiency by rotating a rotating drum in one direction so as to attach and detach a sheet body onto and from the rotating drum.

A front end chuck 62 installed on a front end clamp unit 200 and a rear end chuck 74 installed on a rear end clamp unit 68 are formed so as to be separated from a rotating drum 54. Thus, all of the rotating direction for installation of a press 12 on the rotating drum 54, rotating direction at the time of exposure and rotating direction for the departure of the press 12 from the rotating drum can be aligned in the same direction, the operations largely affecting an operating efficiency such as the change of rotating direction of the rotating drum 54 can be eliminated, and a rapid image exposure can be performed.