Printing System Double-Fed Paper Detection
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Solution Overview
Problem
Printing systems fail to accurately detect double-fed paper mediums, leading to erroneous size recognition and subsequent adjustment of image data, resulting in incorrect printing.
Innovation Solution
A printing system comprising a sensor to measure print medium size, a comparison section to count discrepancies between preset and measured sizes, and a control section that adjusts image data only when the discrepancy exceeds a predetermined reference number of times, preventing erroneous printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feeding sensor measures the size of print mediums to detect double-feeding, then it can identify paper feeding issues, but it erroneously recognizes double-fed paper as larger than the real size, leading to incorrect image data adjustment
Solution Approach 1:
The patent applies preliminary action by comparing the measured size with the preset size before proceeding with image data adjustment. The control section performs a preliminary comparison check to identify potential double-feeding cases, and only when the measured size exceeds the preset size by a specific threshold does it trigger the image data resizing operation. This preliminary filtering prevents erroneous adjustments while maintaining reliable double-feeding detection.
2Adaptability or versatility
If the control section adjusts image data based on every measured size difference, then it can adapt to size variations, but it incorrectly adjusts image data when double-feeding occurs, resulting in printing errors
Solution Approach 1:
The patent applies partial action by selectively adjusting image data only when necessary. Instead of adjusting image data for every measured size difference, the control section implements a threshold-based filter that only triggers adjustment when the measured size exceeds the preset size by a specific threshold value. This partial approach maintains adaptability for legitimate size variations while preventing erroneous adjustments for double-feeding cases.
3Measurement precision
If the system uses a feeding sensor to measure print medium size, then it can detect size variations, but it cannot distinguish between legitimate size differences and double-feeding errors
Solution Approach 1:
The patent applies feedback by implementing a threshold-based decision mechanism. The control section continuously monitors the difference between measured and preset sizes, and when this difference exceeds a predetermined threshold, it triggers a corrective action (skipping the adjustment or alerting the user). This feedback loop enables the system to distinguish between normal size variations and double-feeding errors based on the magnitude of the deviation.
Data Source
AI summary
A system and method of controlling printing are disclosed. The system and method comprise inputting image data printed by a printing section and a preset value for a print medium's size corresponding to the image data; measuring a size of each print medium being fed to the printing section; comparing the measured value for the each measured print medium and the preset value for the print medium's size; counting the number of times in which difference is occurred between the measured value and the preset value; and determining whether the print mediums fed to the printing section are different from the preset print medium's size by comparing the counted number of times and a predetermined reference number of times.