Multi-Page Printing Position Calibration from First-Page Images
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Solution Overview
Problem
Existing printing systems face challenges in efficiently adjusting the printing position of multiple pages in a print job, leading to misalignment due to temperature variations in the transport mechanism, particularly when real-time adjustments are not feasible.
Innovation Solution
A printing system that includes a printing unit, a reading unit, and an adjustment unit to print and read position adjustment images, allowing for minimal adjustments based on a first-page image, with feedback control to correct the printing position of subsequent pages using moving averages and correction values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If printing position adjustment is performed for every page based on position adjustment images of multiple pages, then printing position accuracy is improved, but the number of pages requiring adjustment increases and processing time is extended
Solution Approach 1:
The system performs position adjustment based on the position adjustment image of the first page before printing subsequent pages. By preparing the correction value in advance from the first page's position data, the system eliminates the need to wait for and process position adjustment images from multiple pages, thereby reducing processing time while maintaining printing position accuracy.
Solution Approach 2:
The patent separates the position adjustment process into two distinct phases: (1) acquiring the correction value from the position adjustment image of the first page, and (2) applying this correction value to subsequent pages. This segmentation allows the system to perform adjustment preparation independently before bulk printing, reducing the number of pages that need active adjustment processing.
2Manufacturing precision
If real-time adjustment is performed for each page, then printing position accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The system creates a correction value based on the position adjustment image of the first page and then copies this correction value to subsequent pages. Instead of performing complex real-time adjustment processing for each page, the system replicates the correction data, significantly reducing processing overhead while maintaining consistent printing position accuracy across all pages.
Solution Approach 2:
The patent changes the processing approach from dynamic real-time adjustment (where each page is adjusted individually based on its own position image) to a static parameter application (where correction values derived from the first page are applied to all subsequent pages). This parameter change simplifies the control logic and reduces processing overhead.
Data Source
AI summary
A printing system includes a printing unit that prints a print job and prints a position adjustment image corresponding to each page in the print job, a reading unit that reads the position adjustment image printed by the printing unit, and an adjustment unit that adjusts a printing position of each page in the print job to be printed by the printing unit on the basis of the position adjustment image read by the reading unit, and adjusts printing positions of a minimum number of pages for which printing positions are adjustable, among second and subsequent pages in the print job, on the basis of a position adjustment image of a first page in the print job.