Verification Apparatus for Printing Systems with Dynamic Read Region Adjustment
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Solution Overview
Problem
Conveyance misalignment in printing systems leads to mismatched read regions for multiple imaging units, causing verification failures in printed sheets.
Innovation Solution
A verification apparatus with multiple imaging units that read regions overlapping in the conveyance direction, allowing for size adjustment of read images to match reference images, ensuring accurate verification even with misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple imaging units are used to read different regions of a sheet, then the verification apparatus can cover the entire sheet width, but conveyance misalignment causes the read regions to shift and the read image sizes to mismatch the reference image sizes
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the read region sizes of imaging units based on the actual position of the sheet during conveyance. The control unit calculates the sheet position and adjusts the read region parameters (size and position) accordingly, ensuring that the read images maintain consistent sizes with the reference images even when conveyance misalignment occurs. This resolves the contradiction by making the system adaptable to position variations while maintaining measurement precision.
2Device complexity
If the read regions of multiple imaging units are fixed, then the apparatus structure is simple, but any conveyance misalignment causes verification failure
Solution Approach 1:
The patent implements dynamics by transitioning from fixed read regions to dynamically adjustable read regions. The control unit continuously monitors the sheet position during conveyance and adjusts the read region parameters in real-time. This dynamic adjustment ensures that the read images remain properly aligned with the reference images regardless of conveyance variations, significantly improving verification reliability without requiring overly complex hardware modifications.
3Device complexity
If a single imaging unit is used, then the apparatus is simple and cost-effective, but the read region cannot cover the entire sheet when misalignment occurs
Solution Approach 1:
The patent applies universality by enabling a single imaging unit to perform multiple functions through dynamic read region adjustment. Instead of requiring multiple fixed imaging units for different sheet positions, the control unit adjusts the read region parameters of a single imaging unit to accommodate various sheet positions and sizes. This multi-functional capability allows one imaging unit to effectively cover the entire sheet area under different conveyance conditions, reducing device complexity while maintaining comprehensive coverage.
Data Source
AI summary
A verification apparatus includes reads an image on a sheet conveyed using a plurality of imaging units configured to respectively perform reading in read regions different from each other in a predetermined direction orthogonal to a conveyance direction of the sheet, the read regions respectively corresponding to adjacent imaging units partially overlapping with each other. The apparatus performs processing of changing a size, in the predetermined direction, of a larger one of a read image obtained by reading the image on the sheet by each of the plurality of imaging units, and a corresponding reference image, in accordance with a size of a smaller one, and performs verification by comparing the read image corresponding to each of the plurality of imaging units with the corresponding reference image, after the processing has been completed.