PROBLEM TO BE SOLVED: To provide an on-machine image-drawing lithographic printing method by which it is possible to deal with digital image data and print a plurality of sheets of printed matter with a high definition image at a low cost and a high speed as well as an on-machine image-drawing lithographic printing device. ;SOLUTION: In the on-machine image-drawing lithographic printing method by which a printing plate material is mounted on a plate cylinder of the printing press and a printing plate is prepared by forming an image directly on the plate material by the ink jet process to discharge an oil base ink with the help of an electrostatic field based on a signal of the image data and is used under the described state to perform lithographic printing in succession, an ink jet recording head is immersed in a cleaning liquid and voltage is applied to the recording head. Thus the recording head is cleaned.;COPYRIGHT: (C)2001,JPO
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