| 摘要 |
The invention relates to a method and apparatus for engraving the surface of a gravure printing cylinder with a pattern adapted to be repetitively printed with a joint (J) between the adjacent printed patterns being less visible to the human eye. The method includes scanning a copy (C) of a pattern having selected opposite ends adapted to form a joint on the gravure printing cylinder, and electronically sensing the copy density at two locations (L1, L2), on the pattern copy (C) adjacent the opposite ends. The densities at the different locations are electronically compared, and a correction factor based upon the comparison is electronically determined. Generally circumferentially extending rows of peripherally cells are engraved within the cylinder surface according to the pattern, and the depth of the engraved cells corresponding to the opposite ends of the copy is adjusted according to the correction factor to correct for unbalance in copy density at the two locations (L1, L2) on the pattern copy (C). |
