| 摘要 |
PURPOSE:To dispense with the registering between respective colors by writing images corresponding to (n) colors on the unused plate material wound around the outer periphery of a plate cylinder at an equal interval in the circumferential direction of the cylinder to form press plates and bonding inks of respective colors to the images on the press plates concerned to transfer the same to printing paper. CONSTITUTION:A printing apparatus is a direct plate-making rotary type four-color lithographic offset sheet-fed press and equipped with one plate cylinder 12 capable of forming press plates 28 corresponding to four colors at a predetermined interval, one plate-making part 14 arranged in the vicinity of the outer periphery of the plate cylinder 12 and ink supply devices 16 corresponding to four colors B, C, M, Y and further equipped with a blanket cylinder transferring the ink images on the press plates 28, damping water feeders 20 corresponding to four colors and an impression cylinder 22. The impression cylinder 22 has 1/n (n: number of colors) the diameter of the plate cylinder 12, that is, 1/4 and one printing paper is wound around the cylinder 22 to be continuously rotated (n) times to be discharged. The plate-making part 14 is equipped with a drawing part 30 writing images on an unused plate material 29 and a plate material processing part 32 making press plates 28. |
