PURPOSE: To easily adjust peripheral speed of outer peripheral faces of blanket cylinders by changing relative positions of rotary central axes of the blanket cylinders and providing a control means for increasing and decreasing butting pressures against a paper.

CONSTITUTION: A control device 30 drives bearing means 20 of second, third, and fourth gapless offset rotary printing devices 12, 14, 16 corresponding to first, second, and third printing paper runout detecting means 32a, 32b, and 32c in response to magnitude of a runout of a printing paper 18 detected by the first, second, and third printing paper runout detecting means 32a, 32b, and 32c by eccentric bearing member rotating means 28 so as to change relative positions of rotary central axes of blanket cylinders 12a, 14a, and 16a for the printing paper 18. It functions as a butting pressure control means for increasing/decreasing butting pressures of the blanket cylinders 12a, 14a, and 16a against the printing paper 18.