초록 ▼

In a method for engraving printing cylinders for rotogravure in an electronic engraving machine, at least two engraving lanes with predetermined lane widths lying side-by-side in an axial direction of the printing cylinder are engraved with a respectively allocated engraving element. Before the engr

In a method for engraving printing cylinders for rotogravure in an electronic engraving machine, at least two engraving lanes with predetermined lane widths lying side-by-side in an axial direction of the printing cylinder are engraved with a respectively allocated engraving element. Before the engraving, an axial reference position is predetermined for each engraving element, the axial spacings thereof relative to one another corresponding to the predetermined lane widths of the engraving lanes. The engraving elements are roughly positioned to their reference positions. Subsequently, the axial spacing errors between the reference positions and the actual position of the engraving element the rough positions are measured. During engraving, the engraving elements are moved along the printing cylinder with the faulty spacings relative to one another caused by their rough positioning. The spacing errors are compensated by a shifted engraving of the engraving lanes on the printing cylinder such that the engraving lanes exhibit the predetermined lane widths despite the incorrect spacings of the engraving elements relative to one another.

대표청구항 ▼

[ What is claimed is:] [1.]1. 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 respe

[ What is claimed is:] [1.]1. 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.