Patent ID: 8001900

Claim:
A printing press comprising: a printing unit including a printing cylinder that is capable of replacing a plate; a driving device that drives the printing unit; a position sensor that detects a signal output from said driving device in synchronism with rotation of the driving device and generates position information including an amount of rotation of the driving device; a home position sensor provided on the printing unit to detect a position of the printing cylinder in a rotating direction of the printing cylinder; and a home position storage unit that stores a home position of the printing cylinder by means of extracting position information generated by the position sensor at a point when the home position sensor has detected the position of the printing cylinder, wherein the home position storage unit stores the home position before an issuance of a command for replacement of the plate, wherein the position information at the point when the home position sensor has detected the position of the printing cylinder is extracted a plural number of times, wherein the home position storage unit stores the home position when a plural number of extracted position information are identical, and wherein the home position storage unit stores the home position of the printing cylinder only after ascertaining a plurality of identical position information consecutively generated by the position sensor at the point when the home position sensor has detected the position of the printing cylinder.