Printing Apparatus Misregister Displacement Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for measuring misregister displacement in printing apparatuses are time-consuming and complex, making it difficult to accurately determine and correct for misregister in the transport direction.
Innovation Solution
A printing apparatus and method that uses a testing chart with multiple displacement detecting charts, including a first detecting chart for determining the direction of displacement and a second detecting chart with varied shift amounts to calculate the total displacement, allowing for quick and accurate measurement of misregister displacement, and a correcting device to adjust print head timing for improved print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional visual measurement methods with magnifying glasses or dedicated measuring instruments are used to determine misregister displacement, then measurement precision can be achieved, but the measurement process becomes time-consuming and complex
Solution Approach 1:
The patent creates a test chart pattern that copies the misregister displacement information in a visually detectable format. The test chart includes reference marks and measurement marks that replicate the displacement pattern, allowing the operator to measure displacement by simply observing the test chart through a magnifying glass without needing complex dedicated measuring instruments. This copying approach maintains measurement precision while dramatically reducing the time and complexity of the measurement process.
Solution Approach 2:
The test chart serves as an intermediary between the printed material and the measurement process. Instead of directly measuring the misregister on the actual printed output, the patent uses the test chart as a mediator that translates the displacement information into a easily observable form. The test chart pattern includes reference marks and measurement marks that make the displacement visible and measurable through simple visual inspection, thereby reducing both time and complexity while maintaining precision.
2Productivity
If multiple print heads are used to perform printing, then printing productivity is improved, but misregister displacement occurs in the transport direction due to timing adjustments
Solution Approach 1:
The patent applies preliminary action by measuring and determining the misregister displacement amount before actual printing operations. The test chart is printed first to detect the displacement amount, and this information is used to calculate correction values that are then applied to adjust the timing of each print head. This preliminary measurement and correction approach allows multiple print heads to maintain both high productivity and precise printing position accuracy.
Solution Approach 2:
The patent implements a feedback mechanism where the test chart measurement results are used to adjust the timing of print heads. The displacement amount detected from the test chart feeds back into the printing system to calculate correction values, which are then applied to optimize the timing of each print head. This closed-loop feedback ensures that multiple print heads work together with high productivity while maintaining accurate printing positions without misregister displacement.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A printing apparatus of this invention scans with a tester 17 a testing chart printed by a printing controller 25 to acquire testing image data. A total amount of displacement calculator 33 calculates an amount of displacement of a recording position including a direction of misregister as a total amount of displacement, based on a large amount of displacement determined by a large amount of displacement determiner 28, a direction of displacement detected by a direction of displacement detector 29, a shift amount corresponding to an amount of displacement detecting chart determined by an amount of displacement detecting chart determiner 31, and a peak position of the amount of displacement detecting chart determined by the amount of displacement detecting chart determining unit 31. Thus, since a total amount of displacement of the misregister can be calculated only by printing the testing chart on web paper WP, an amount of displacement of the misregister in the transport direction can be obtained easily in a short time.