Method of operating an autotypical color offset printing machine

Details Method of operating an autotypical color offset printing machine Method of operating an autotypical color offset printing machine

1986-03-20

1989-08-01

Fisher, J. Reed

Printing

Multicolor

Processes

101365, 101181, 101DIG45, B41F 3104, B41F 706

Patent

active

048524859

ABSTRACT:
The invention relates to a method, a control apparatus and aids for the achievement of a uniform printing result on an autotypically operating multicolor printing press. In addition to solid densities and/or screen dot sizes, selected relationships between solid densities and/or screen dot sizes of different printing colors are determined at measuring patches simultaneously printed within the color zones. If they fall outside of the tolerances associated with them, a corrective intervention is made in the printing process by actuating the regulators of the inking units. For the control of the inking units, the first aid provided, instead of the conventional single color meausring patches, is combination measuring patches which are formed by the overprinting of single color measuring patches. Since the measurement data obtained at combination measuring patches do not agree with the data obtained at single color measuring patches, they are corrected accordingly prior to being processed to control signals for the regulators in the printing units. A second aid consists of a device for determining the color balance in the printing result.

REFERENCES:
patent: 3835777 (1974-09-01), Krygeris
patent: 4200932 (1980-04-01), Schramm et al.
patent: 4310248 (1982-12-01), Meredith
patent: 4606633 (1986-08-01), Jeschke et al.
patent: 4667596 (1987-05-01), Dotzel et al.
Graphic Arts Japan, vol. 26, 1984-1985, pp. 26-31, Japan Printer's Association; Tatsuo Kunishi: "Estimation of Values of Primary Inks in Color Prints".

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