Erased Sheet Reusability Detection via Variable Illumination Angles
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Solution Overview
Problem
Existing methods for determining the reusability of sheets after erasing an erasable image are inefficient, as they fail to accurately detect residual images and appearance defects, leading to potential reuse issues and improper stacking of sheets.
Innovation Solution
A reusability determination device that uses a sheet carrying path, imaging, and illumination with adjustable angles to detect residual images and appearance defects, allowing for automatic determination of sheet reusability and sorting based on imaging information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single illumination angle is used for imaging, then the imaging system is simple, but residual images and appearance defects cannot be accurately distinguished
Solution Approach 1:
The illumination system dynamically changes the irradiation angle to different positions on the sheet. The imaging portion captures images at multiple angles (e.g., 0 degrees for residual images, 45 degrees for wrinkles), allowing accurate distinction between defect types without requiring multiple fixed illumination sources. This dynamic adjustment resolves the contradiction by achieving high detection precision while maintaining relatively simple system structure.
2Productivity
If manual inspection of erased sheets is performed, then equipment complexity is low, but productivity and detection accuracy are insufficient
Solution Approach 1:
The manual inspection process is replaced with an automated imaging and analysis system. The imaging portion captures sheet images, and the control portion automatically analyzes them to detect residual images and appearance defects. This substitution dramatically increases productivity and detection accuracy while the complexity is managed through integrated control algorithms that process multiple angled images to determine sheet reusability.
3Reliability
If erased sheets are stacked without prior detection, then the stacking process is simple and fast, but sheets with defects may be improperly reused
Solution Approach 1:
The system performs preliminary detection and classification of erased sheets before stacking. The control portion analyzes images captured at multiple angles to identify residual images and appearance defects, then determines reusability in advance. Sheets are sorted into appropriate stacks based on their quality assessment, ensuring that only suitable sheets are reused while maintaining an organized stacking structure. This preliminary action guarantees reliability without requiring overly complex sorting mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate detection and sorting of reusable sheets, ensuring reliable reuse and efficient treatment of erased sheets by distinguishing between residual images and appearance defects through varying illumination angles.
Implementation Method 1
an illumination portion that illuminates the second state sheet on the sheet carrying path at a first irradiation angle when images remaining on the second state sheet are photographed, and at a second irradiation angle smaller than the first irradiation angle when a projected image generated by illuminating the second state sheet is photographed
Data Source
AI summary
A printing sheet reusability determination device includes a sheet carrying path that carries a second state sheet obtained by erasing an erasable image from a first state sheet on which the erasable image is printed, an imaging portion that images the second state sheet on the sheet carrying path, an illumination portion that illuminates the second state sheet on the sheet carrying path at a first irradiation angle when images remaining on the second state sheet are photographed, and at a second irradiation angle smaller than the first irradiation angle when a projected image generated by illuminating the second state sheet is photographed, an irradiation angle changing portion that changes the first irradiation angle and the second irradiation angle, and a reusability determination portion that determines whether or not to reuse the second state sheet based on imaging information obtained by the imaging of the imaging portion at the first irradiation angle and determines whether or not to reuse the second state sheet based on imaging information obtained by the imaging of the imaging portion at the second irradiation angle.