Patent ID: 8085973

Claim:
A method for the detection, at the correct time, of print marks located at regular intervals on a print web, comprising: providing a camera with a processing unit assigned to the camera; continuously feeding process data from a drive control system to the processing unit, wherein the drive control system controls a movement of the print web; calculating a plurality of initial detection times based on the supplied process data, where the initial detection times are coordinated with one another such that a print mark is shown on at least one image recorded at one of the initial detection times using the camera; activating the camera at the initial detection times to record images; evaluating the recorded images by searching for a print mark on the images and obtaining initialization data by the processing unit; calculating a first pass detection time based on the initialization data and the supplied process data by the processing unit such that a print mark is shown on an image recorded at the first pass detection time using the camera; activating the camera at a first pass detection time to record an image; and subsequently repeating the following steps: evaluating at least the last recorded image in each instance and determining a correction value for a next pass detection time by the processing unit, calculating a next pass detection time based on the initialization data and the supplied process data by the processing unit and correction of the next pass detection time with the aid of the correction value by the processing unit, activating the camera at the respective next pass detection time to record an image with a print mark.