Method and apparatus for on-line monitoring print quality
OwnerIsmo Heikkila, Jarmo Seppaneninventors
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Abstract
An apparatus and a method for measuring print quality in a printing press used in newspaper production, wherein the measuring apparatus measures several parallel reflection profiles extending in the longitudinal direction simultaneously across the entire width of a paper web and the measurement results of the measuring apparatus are used for the detection of waste and for the adjustment of inking in the printing press in real time.
Claims20
An apparatus for measuring, in connection with a printing press, print quality of the printing press used in the production of newspapers, which apparatus is provided with light sources illuminating a moving paper web and with photo detectors measuring the light reflected from the surface of the paper web and sent by the light sources, wherein the apparatus is arranged to measure, continuously during the running of the printing press and simultaneously substantially across the entire width of the paper web, several parallel reflection profiles that extend in the longitudinal direction substantially over the entire page, and use the measurement results of the measuring apparatus in real time for the detection of waste and for the adjustment of inking in the printing press.
A method for measuring and monitoring print quality of a printing press used in the production of newspapers based on reflection profile measurements, wherein a moving paper web is illuminated by means of light sources and the light reflected from the surface of the paper web and sent by the light sources is measured by means of photo detectors, wherein the method determines reference profiles at the beginning of the printing process and measures reflection profiles during production substantially from the entire area of a page, in the longitudinal direction substantially over the entire page and substantially across the entire width of the paper web, the measuring and monitoring of the print quality during production being based on comparing the reflection profiles measured and the reference profiles and on calculating parameters, on the basis of which it is inferred as to when the operation of the printing press is normal, and during said normal operation the darkness of the print is measured from test marks or from another part representing a given darkness of the print, and inking in the printing press is adjusted based on the result of measurement.
Dependencies are inferred from the claim text.