Patent ID: 8495958

Claim:
A printer for corrugated cardboard sheets, the printer comprising: a printing cylinder that is drivably and rotatably supported such that the printing cylinder is opposed to a conveyed corrugated cardboard sheet; a printing plate attached on a surface of the printing cylinder; an ink supply roll that is drivably and rotatably supported and supplies ink to the printing plate; a roll moving unit that moves the ink supply roll toward or away from the printing cylinder; and a control unit that controls an operation of the roll moving unit, wherein the control unit includes a timing setting unit that sets a timing for moving the ink supply roll, and a time obtaining unit that obtains a first time interval T11 based on a first equation and a second time interval T12 based on a second equation, the first time interval T11 being a time interval elapsed from (i) a time when the corrugated cardboard sheet starts from a sheet feeding position until (ii) a time when the ink supply roll starts approaching movement to the printing cylinder, and the second time interval T12 being a time interval elapsed from (a) the time when the corrugated cardboard sheet starts from the sheet feeding position until (b) a time when the ink supply roll starts separating movement from the printing cylinder, when the ink supply roll moves toward the printing cylinder relative to an intermediate position of a gap between ends of the printing plate, the timing setting unit sets the timing for moving the ink supply roll toward the printing cylinder based on the first time interval T11 obtained by the time obtaining unit, and when the ink supply roll moves away from the printing cylinder relative to the intermediate position of the gap between ends of the printing plate, the timing setting unit sets the timing for moving the ink supply roll away from the printing cylinder based on the second time interval T12 obtained by the time obtaining unit.