Patent ID: 6467405
Filing Date: 2002-10-22
Classification: H04N

Abstract:
A method for line-by-line engraving of printing forms for rotogravure on a print cylinder in an electronic engraving machine with an engraving element charged by an engraving control signal that engraves into the cylinder a sequence of cups arranged in an engraving raster and wherein geometric dimensions of the cups represent gradations to be engraved, comprising the steps of:determining positions of individual printing form elements to be engraved in the printing form by a computer generated cylinder layout in a computer work station, wherein the print cylinder comprises two end portions and a main engraving portion, the individual printing form elements being in the main engraving portion; engraving test cups into the print cylinder within at least one test cut region during a test cut occurring before the engraving of the printing form and interpreting geometric dimensions of the test cups for calibration of the engraving control signal; and determining size and position of the test cut region based on the computer generated cylinder layout for avoiding a faulty positioning of the test cut region on the print cylinder and for positioning the test cut region between individual printing form elements.