Electronic cylinder making method

Details Electronic cylinder making method Electronic cylinder making method

1981-07-23

1983-12-20

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358287, 382 47, 364469, H04M 122

Patent

active

044221010

ABSTRACT:
An electronic cylinder making method and an apparatus for the same, which makes a printing cylinder for an endless and/or a multiple pattern. Even where a difference arises between the density of the front side of the original and that of the backside thereof as well between the density of the right side of the original and that of the left side thereof, the cylinder making method and apparatus of this invention eliminate the appearance of the density difference at the seams of the front side and backside of the respective main patterns and those of the right side and left side thereof when the main patterns are engraved on a printing cylinder. The cylinder making method of the invention includes the steps of forming the original with a main pattern which is extended lengthwise and crosswise by a prescribed length; scanning the original to provide digital density signals; supplying the digital density signals to a computer; gradually converting the signals denoting the densities of the extended backside and right side pattern sections into the signals denoting the densities of the opposite front side and left side pattern sections to the extended pattern sections; and engraving screened patterns on a cylinder in accordance with the contents of signals denoting the corrected densities, thereby producing a printing cylinder which is engraved with patterns whose seams are free from density differences.

REFERENCES:
patent: 3582549 (1971-06-01), Hell
patent: 3770888 (1973-11-01), De Vos et al.
patent: 4013829 (1977-03-01), Baar et al.
patent: 4013831 (1977-03-01), Dolves et al.
patent: 4057838 (1977-11-01), Doelves et al.
patent: 4163605 (1979-08-01), Yamada
patent: 4245260 (1981-01-01), Doelves
patent: 4282550 (1981-08-01), Coyiello

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