Abstract: In a method for processing signals in an electronic engraving machine for engraving printing forms, in particular printing cylinders used for rotogravure, an engraving control signal is obtained by superimposing engraving data, representing tone values between “white” and “black” which are to be engraved, with a periodic screen signal for generating a gravure screen. The engraving control signal guides the lifting movement of the stylus of an engraving element. As a result of the lifting movement of the stylus, a series of cups arranged in the gravure screen is engraved on the printing form. To compensate an incorrect lifting movement of the stylus (rebound effect, lag effect), the engraving data undergo digital filtering before superposition of the gravure screen.

Abstract: In a method for engraving a printing cylinder using an engraving member in an electronic engraving machine, an engraving tool of an engraving member controlled by an engraving signal engraves a sequence of grooves arranged in a printing screen in a rotating printing cylinder. The engraving signal is formed by superimposing an image signal representing the shade values of light and dark of the grooves to be engraved and a periodic screen signal for generating the printing screen. In order to compensate for disruptive influences on the shade values of the engraved grooves resulting from operating temperatures in the engraving member, the operating temperature in the engraving member is measured at at least one measurement point. Depending on at least one measuring temperature, the electrical control of the engraving member is corrected and/or the temperature of at least one component of the engraving member and/or the air circulating around the engraving member is modified.

Abstract: In a method for measuring cups given the engraving of printing cylinders in an electronic engraving machine, an engraver of an engraving member engraves cups into a printing cylinder. The geometric dimensions of the cups represent actual hue values. A video image of the cups is picked up. The contour of a cup is determined in the video image and the geometric dimensions of the cup are determined in that the cup contour is measured. For this purpose, the cup contour in the picked up video image is smoothed by a simulation with a spline function or a general polynomial function, and the geometric dimensions of the cup are determined on the basis of the smoothed cup contour. The determined geometric dimensions are the transverse diagonal, the longitudinal diagonal, the through-cut, the web width, the cup surface or the cup volume.

Abstract: In a method for measuring cups given the engraving of printing cylinders in an electronic engraving machine, an engraver of an engraving member engraves cups into a printing cylinder. The geometric dimensions of the cups represent actual hue values. A video image of the cups is picked up. The contour of a cup is determined in the video image and the geometric dimensions of the cup are determined in that the cup contour is measured. For this purpose, the cup contour in the picked up video image is smoothed by a simulation with a spline function or a general polynomial function, and the geometric dimensions of the cup are determined on the basis of the smoothed cup contour. The determined geometric dimensions are the transverse diagonal, the longitudinal diagonal, the through-cut, the web width, the cup surface or the cup volume.