| 摘要 |
PURPOSE:To improve an accuracy of an aim mark, and to detect easily the aim mark by providing a means for cutting off a light of a wavelength band to which a photosensitive layer of a printing edition reacts, and also forming the aim mark on the surface of the printing edition by a substance whose reflecting density is different from a color of an Al ground of the printing edition, on a drawing head. CONSTITUTION:A drawing heat 5 which can move freely on a drawing plate 1 is provided, a drawing means for forming a dragonfly mark 52 for a film negative contact printing to the surface of a printing edition is provided on this drawing head 5, and also a register mark for transferring a substance for cutting off a light of a wavelength band to which a photosensitive layer of a printing edition P reacts, being different in its reflecting density from an Al ground of the printing edition P and assuming a color which can be discriminated clearly by an optical sensor is formed on the construction head 5. That is to say, the drawing heat 5 is constituted so as to be freely movable on the drawing plate 1, and the movement and stop of such a drawing head 5 are controlled by a computer. In this way, drawing of the dragonfly mark 52 for positioning at the time of a film negative contact printing, and an aim mark 53 which can maintain a distinct picture even after passing through the developing and fixing processes can be formed on the surface of the fixed printing edition by one drawing head 5. |
