The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 1996
Filed:
Oct. 21, 1994
Hans J Six, Munich, DE;
MAN Roland Druckmaschinen AG, , DE;
Abstract
A method for controlling the ink feed of a printing machine, especially an offset printing machine, for printing four-color half-tone combined prints. In selected test regions in an original and in the corresponding test regions in the printed sheet, the standard color values of the four-color overprint are determined. The infrared color density for the black printing ink is determined in the near infrared. The standard color values of the four-color overprint are converted by means of a linear transformation into standard color values corresponding to the combined print of only the three chromatic colors. The coefficients of the linear transformation are determined empirically as a function of the infrared color density of the black printing ink. From the standard color values of the three-color print, the effective surface coverage values of the three chromatic colors are determined via the modified Neugebauer equations. The effective surface coverage value of the black ink is determined from the infrared color density according to an empirical relationship. The settings for the ink feed elements of the printing machine are adjusted according to the differences in the effective surface coverage values between the original and the printed product.