| abstract |
(57) [Summary] [PROBLEMS] To provide a lithographic printing method capable of coping with digital image data and capable of printing a large number of inexpensive, high-speed, and clear images. According to a planographic printing method for performing lithographic printing after forming an image directly on a printing original based on a signal of image data and creating a printing plate, a printing press is used to form a printing image. A voltage is applied to a printing original plate 9 mounted on a drawing drum which can be installed as a plate cylinder 11 in accordance with a digital image signal to an electrode provided in an ink head, and a voltage is applied between the printing original plate and an electrically grounded printing original plate. It is performed by an ink jet method in which oil-based ink is ejected using an electrostatic field formed on the printing drum, and then a drawing drum on which the plate material for drawing and plate making is mounted is set as a plate cylinder on a printing machine with a detachable plate cylinder portion. And performing lithographic printing. |