Patent ID: 6430462
Filing Date: 2002-08-06
Classification: B41C,H04N

Abstract:
A method for signal processing in an electronic engraving machine for engraving a printing cylinder for rotogravure with an engraving element controlled by an amplified analog engraving control signal, comprising the steps of:forming a digital transfer function whereby at least one of the transfer function and transfer coefficients of the transfer function are modified by control data; modifying the transfer function by setting parameters for calibrating gradations â€œblackâ€  and â€œwhiteâ€  to be engraved; providing correction data for a cut depth correction of the engraving element dependent on at least one of engraving data and control data; additionally correcting the transfer function by the correction data for compensating a mechanical wear of the engraving stylus; generating engraving control data according to the transfer function from engraving data that represent gradations between â€œblackâ€  and â€œwhiteâ€  to be engraved and from function value data that represent a periodic raster signal for generating a raster; converting the engraving control data into said amplified analog engraving control signal; and engraving with an engraving stylus of the engraving element controlled by the engraving control signal a sequence of cups arranged in the raster into the printing cylinder, and executing with the engraving element a feed motion along the printing cylinder directed in an axial direction of the printing cylinder for engraving of the cups.