Patent ID: 6283019
Filing Date: 2001-09-04
Classification: B41C,H04N,Y10T

Abstract:
A method for engraving printing cylinders for rotogravure in an electronic engraving machine wherein at least two engraving lanes with predetermined lane widths lying next to one another in an axial direction of the printing cylinder are engraved with an allocated respective engraving element, comprising the steps of:before engraving, setting axial spacings of the engraving elements relative to one another and predetermining an axial reference position for each engraving element, axial spacings of the reference positions relative to one another corresponding to said predetermined lane widths of the engraving lanes;roughly positioning the engraving elements to their reference positions;measuring axial spacing errors between the reference positions and actual positions of the engraving elements based on the rough positioning;engraving with the engraving elements a sequence of cups arranged in an engraving raster into the rotating printing cylinder, and forming engraving control signals for drive of the engraving elements by superimposition of engraving signals that represent tonal values to be engraved with a periodic raster signal for generating said raster;during said engraving, executing with the engraving elements a feed motion along the printing cylinder in the axial direction and with faulty spacings relative to one another caused by the rough positioning; andcompensating the axial spacing errors by a shifted engraving of the engraving lanes on the printing cylinder such that the engraving lanes exhibit said predetermined lane widths despite the faulty spacings of the engraving elements relative to one another.