| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of re-transposition scumming due to undried ink in the case of resupplying a one-side printed sheet and double-side printing, to shorten a waiting time from an end of the one-side printing to the resupplying, and to prevent a decrease in image quality due to an ink insufficiency on a printing surface of the one-side printed sheet. SOLUTION: A sheet supply rotor 46 is brought into contact with a printing surface of a one-side printed sheet P2 to be resupplied of one component of a double-side printing sheet supply unit 10, and a pressure contact rotor 66 is rotated while being brought into pressure contact with the rotor 46. When an undried ink is transferred from the printing surface of the sheet P2 to be resupplied to the rotor 46, the undried ink is thinly uniformly extended on surfaces, of both the members of the rotor 46 and the rotor 66, dried, and almost all the ink is not transferred from the rotor 66 to a printing surface of next one-side printed sheet P2, thereby preventing re-transposition scumming of the sheet P2.
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