ARRANGEMENT FOR CAPTURING AN IMAGE OF A PRINTING SUBSTRATE WEB

摘要

An arrangement for capturing an image of a printing substrate web in a printing machine, includes a camera that has a sensor field extending parallel to the printing substrate web, and an objective lens an optical axis of which runs at right angles to the sensor field, a light source that is arranged relative to the printing substrate web such that the light emitted therefrom is reflected by reflective surface portions of the printing substrate web mainly into the camera, and the objective lens is arranged to be offset from the sensor field such that a straight line extending through the center of the sensor field and the center of the objective lens and a straight line extending from the center of the light source to the center of the light incident on the image field on the printing substrate web form equal angles with the axis of incidence.