Controlling register in a printing press

Details Controlling register in a printing press Controlling register in a printing press

1982-10-27

1985-07-30

Krass, Errol A.

Boots, shoes, and leggings

101181, 226 3, 226 27, 364519, B65H 2304

Patent

active

045325960

ABSTRACT:
For register control when printing on a web, signals corresponding to a predetermined hidden pattern of low-amplitude density variations are superimposed on picture signals representing the image to be printed. After printing, light from elements of the printed image, with its hidden pattern, is detected by a register scanning head and the variations are correlated in a signal processor with the known variations of portions of the predetermined hidden pattern. In this way a position error signal is derived and can be used to correct the web position.

REFERENCES:
patent: 3701464 (1972-10-01), Crum
patent: 4428287 (1984-01-01), Greiner

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