Method for engraving printing cylinders having seamless joints within repeated patterns

摘要

PCT No. PCT/DE85/00239 Sec. 371 Date Mar. 7, 1986 Sec. 102(e) Date Mar. 7, 1986 PCT Filed Jul. 11, 1985 PCT Pub. No. WO86/00770 PCT Pub. Date Jan. 30, 1986.A method for producing printing cylinders for seamless or endless patterns with printing form engraving machines having a scan cylinder and an engraving cylinder. A pattern original on the scan cylinder is opto-electronically scanned picture-element-wise along scan lines lying next to one another which run in a circumferential direction of the scan cylinder, and where every scan line supplies the information for an engraving line of a pattern repeat to be transmitted onto the printing cylinder. The scan original is longer than the pattern repeat (original extension). In a mixing region, picture elements of the original extension and of the beginning of the original stored for every scan line are combined in accordance with a prescribed mixing function to form picture elements having a new density information. For engraving of the printing cylinder, the overall repeat is formed from the picture elements deriving from this mixing and the unaltered picture elements following from the end of the mixing region up to the end of the pattern repeat of the lines.