Inline measurement and closed loop control method in printing machines
First Claim
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1. A method for detecting spectral, densitometric or color measured values on sheet printing materials during a printing process in a sheet-fed printing press wherein sheets are moved through the printing press, the method which comprises:
- determining the measured values on sheets moving through the printing press;
calibrating sensors for picking up the measured values with a calibration device at specific time intervals for color calibration, the computer having one or more calibration surfaces with associated measured values stored therein, and the calibration surfaces being used as reference values for the calibration device, the sensors being measuring heads;
converting calibration values determined by a calibration of a given measuring head, by way of the computer, into calibration values for further measuring heads; and
processing the measured values in a computer and using the processed values as control parameters for controlling the printing process of the sheet-fed printing press.
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Abstract
Spectral, densitometric, or color measured values are detected on sheet printing materials during the printing process in a sheet-fed printing press. The measured values are determined on sheets as they are moving through the printing press and the measured values are used in real-time by a computer to control parameters for controlling the printing process in the sheet-fed printing press.
36 Citations
28 Claims
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1. A method for detecting spectral, densitometric or color measured values on sheet printing materials during a printing process in a sheet-fed printing press wherein sheets are moved through the printing press, the method which comprises:
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determining the measured values on sheets moving through the printing press; calibrating sensors for picking up the measured values with a calibration device at specific time intervals for color calibration, the computer having one or more calibration surfaces with associated measured values stored therein, and the calibration surfaces being used as reference values for the calibration device, the sensors being measuring heads; converting calibration values determined by a calibration of a given measuring head, by way of the computer, into calibration values for further measuring heads; and processing the measured values in a computer and using the processed values as control parameters for controlling the printing process of the sheet-fed printing press. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for detecting spectral, densitometric or color measured values on sheet printing materials during a printing process in a sheet-fed printing press wherein sheets are moved through the printing press, the method which comprises:
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determining the measured values on sheets moving through the printing press; processing the measured values in a computer and using the processed values as control parameters for controlling the printing process of the sheet-fed printing press; and providing sensors being measuring heads and in at least one inking zone, carrying out measurements with a measuring head on a light/dark edge and thereby moving the measuring head in uniform steps from one side of the light/dark edge over the light/dark edge to the other side of the light/dark edge, and comparing the intensity measured values thereby registered with a known structure of the measuring head.
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28. A method for detecting spectral, densitometric or color measured values on sheet printing materials during a printing process in a sheet-fed printing press wherein sheets are moved through the printing press, the method which comprises:
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determining the measured values on sheets moving through the printing press; processing the measured values in a computer and using the processed values as control parameters for controlling the printing process of the sheet-fed printing press; and providing sensors being measuring heads and simultaneously with a color measurement of a first measuring head, registering a measured value on a white background of a printing material with a second measuring head and determining therefrom a white reference value and using the white reference value to correct the color measured values determined with the first measuring head.
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Specification