| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of the press plate of a lithographic printing plate, in which an ink roller, a dampening water and an ink are checked from being polluted by a developing part, and a normal printed matter can be obtained in a short time, the manufacturing method of a printed matter, and an automatic printing mechanism of a printer. SOLUTION: A lithographic printing plate, which can be developed with water or on a printer, is developed on the offset printer in the following procedures: at least either one of heat and light is given in an image-like fashion; a lithographic printing plate is installed onto the plate cylinder of the printer; the offset printer is started and an ink roller is not in contact with the plate cylinder; the plate cylinder is started and the dampening water roller is brought into contact with the plate cylinder so as to feed a dampening water to the plate cylinder, and finally the lithographic printing plate is developed through a stage for transferring at least some part of a developing part onto an accepting element (a printing paper).
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