Apparatus for ensuring the quality of printed products

Details Apparatus for ensuring the quality of printed products Apparatus for ensuring the quality of printed products

1982-03-15

1984-05-15

Corbin, John K.

Optics: measuring and testing

By shade or color

With color transmitting filter

356445, G01J 348, G01N 2155

Patent

active

044485336

ABSTRACT:
Monitoring device for densitometrically evaluating printed sheets with a printed print-monitoring strip includes holding means, a plurality of first densitometers for exclusively measuring full-tone density carried by the holding means at a selective spacing from one another so as to define respective gaps between the first densitometers, and a plurality of second densitometers for measuring at least one tone density value selected from a range of screen and full tone values, the second densitometers being receivable, respectively, in the gaps between the first densitometers and being connectible to a device for mathematically correlating the values measured by the second densitometers with quality-assessing parameters.

REFERENCES:
patent: 4003660 (1977-01-01), Christie

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