Patent ID: 8870316

Claim:
A printing press, comprising at least one ink supply system, with which ink can be transferred from an inlet point to the printing substrate, at least one optical measuring device for measuring actual optical, values (I) of light, in which the actual optical values (I) are from light of selected wavelength ranges and in which the light has interacted with at least parts of the printing picture, an ink mass determination device for determining the weight of at least parts of the ink which is located within an ink supply system, a control and evaluation device which is connected with the at least one optical measuring device and with the ink mass determination device, and which control and evaluation device is adjusted so as to use these receive measured values (I) from the optical measuring device to determine the optical deviation (ΔK), which is the deviation of the actual optical values (I) from the optical reference values (S), which are available as light intensity values (L) of selected wavelength ranges, and which control and evaluation device is adjusted so as to determine on the basis of the optical deviation (ΔK) and the values from the weighing devices, how much corrective ink having a determined composition is fed to the printing press in order to approximate the actual optical values (I) to the optical reference values (S), wherein the control and evaluation device is adjusted so as to execute the following procedure when different printing jobs are performed sequentially with said printing press, wherein an equal optical reference value (S) with regard to at least, one colour underlies at least two of said different printing jobs for at least one colour: measured values and/or ink formulas of a former of said at least two different printing jobs are taken into account for supplying of the ink mixture for a later one of the at least two printing jobs, wherein one of these measured values is the deviation (ΔK), which has resulted from the former of the at least two different printing jobs, when it was printed with an ink mixture, which was used for the attainment of the optical reference value (S), wherein in addition to the optical measured values the composition and/or formulas of the ink mixtures, which led to the deviations (ΔK, ΔK, ΔK 2 ) of said optical measured values (I) from the optical reference values (S), are taken into account.