Register Deviation Measurement Using Recursive Ghosting Analysis
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Solution Overview
Problem
Conventional register measuring devices in multi-color printing presses fail to accurately distinguish between register deviations and ghosting effects, leading to erroneous results and improper control of register adjustments due to the influence of ghosting effects during printing operations.
Innovation Solution
A method and device that utilize recursion analysis in a computing unit to consider the ghosting effects of preceding and succeeding printed images, allowing for the separation of ghosting effects from register deviations, thereby enabling accurate determination and correction of register deviations without requiring a second measurement or specialized ghosting detection devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional register measuring devices are used to measure register deviations, then register deviations can be detected, but ghosting effects are incorrectly included in the measurements leading to erroneous results
Solution Approach 1:
The patent segments the measured signal into two distinct components: ghosting effects and true register deviations. By analyzing the periodicity and characteristics of the measured data, the system separates these overlapping influences, allowing accurate determination of register deviations independent of ghosting effects.
Solution Approach 2:
The patent implements a feedback mechanism where the determined ghosting effects are recursively used to correct subsequent measurements. The system continuously refines its understanding of ghosting patterns and uses this information to improve the accuracy of register deviation measurements in real-time during the printing process.
2Productivity
If ghosting effects are not distinguished from register deviations, then measurements can be obtained quickly, but control drives for compensation cannot be appropriately controlled and deviations persist
Solution Approach 1:
The patent performs preliminary analysis of the measured signal to identify and characterize ghosting effects before using the data for register control. By pre-processing the measurements to separate ghosting from true deviations, the system prepares clean, accurate data for the control drives, ensuring both speed and precision in register correction.
3Measurement precision
If a second measurement or specialized ghosting detection devices are used to separate ghosting effects, then accurate register deviations can be determined, but device complexity and measurement time increase
Solution Approach 1:
The patent makes the conventional register measuring device multi-functional by enabling it to perform both traditional register measurement and ghosting effect analysis using the same hardware. The computing unit processes the measured data to extract both types of information simultaneously, eliminating the need for separate specialized devices while maintaining measurement accuracy.
Solution Approach 2:
The system uses its own measurement data to identify and characterize ghosting effects without requiring external specialized equipment. By analyzing patterns in the measured register data itself, the system self-diagnoses ghosting conditions and compensates for them, making the measurement device self-sufficient and reducing overall system complexity.
Data Source
AI summary
A method and a device for determining color register and lateral register deviations on printing material during production in multi-color printing presses, include a computing unit which takes into consideration the influence of ghosting effects when measuring the deviations on the printing material. The ghosting effects of at least one preceding and/or one succeeding printed image are recursively taken into consideration in the computing unit, when measuring on the printing material.