| 摘要 |
1. A process for the positioning of printing forms by means of guide marks, in which, during the exposure of the printing form through an original, at the same time measurement marks in a predetermined position relative to the printing area of the original are exposed, which are subsequently developed with the printing form by means of toner, wherein at least two measurement marks are exposed on the printing form, of which one measurement mark consists of a circular black surface with a circular white surface in the center and the other measurement mark consists of two lines extending parallel to one edge of the printing form with a white surface between the lines, wherein a respective measurement light beam illuminates the two developed measurement marks, and wherein the light refelected from the measurement marks is measured and the printing form is positioned, in dependence upon the intensity of the reflected light, until a maximum intensity of the reflected light is reached. |
