Heidelberger Druckmaschinen Ag

Hell Gravure Systems Gmbh

Gottfried Ernst-Rudolf Weidlich

In a method for making and evaluating a sample cut in an engraving machine, an engraving control signal for guiding a stylus is formed from engraving data. The stylus cuts a series of cups. During a trial engraving trial cups are engraved and a video image is made. In accordance with screen parameters, measuring points are fixed in the video image as distances to a selected reference point. Geometric parameters of the trail cups are measured in the video image and are compared to corresponding geometric parameters of the cups representing predetermined tone values. Adjustment values are deduced from this comparison which are used to calibrate the engraving control signal.

Method for making and evaluating a sample cut

In a method for positioning engraving elements in an electronic engraving machine for a rotogravure printing cylinder engraving at least two adjacent lying engraving areas of selected widths by engraving with an engraving element respectively assigned thereto, axial reference positions are selected for the engraving elements whose axial distances to each other correspond to the selected widths of the engraving areas that are to be engraved. An electronic position measuring system formed essentially of a video camera and an image evaluation unit is successively placed on the axial reference positions. At each reference position, the axial divergence of the tip of the stylus pertaining to the appropriate engraving element or the divergence of at least one cup which is test engraved by the engraving element from the reference position is determined using the position measuring system. The engraving elements are then automatically shifted according to the chosen divergences and placed exactly on the reference positions.

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Kiel, Germany

Gottfried Ernst-Rudolf Weidlich