Multi-feed Detection via Continuous Overlap Length
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Solution Overview
Problem
Existing medium conveying apparatuses face challenges in accurately detecting multi-feeds, which can lead to incorrect detection and potential damage to the medium.
Innovation Solution
A medium conveying apparatus equipped with a conveying roller, an overlap detection sensor, and a processor that calculates the overlap length and determines whether a multi-feed has occurred based on the sensor outputs, executing abnormal processing when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-feed detection is performed based on signal intensity variation at multiple locations, then multi-feed detection capability is improved, but detection accuracy deteriorates due to erroneous detection on documents with adhered objects
Solution Approach 1:
The patent changes the detection parameter from signal intensity variation to continuous overlap length measurement. By calculating the length of continuous overlap portions and comparing it with a threshold, the system achieves more accurate multi-feed detection that is not affected by adhered objects on documents.
Solution Approach 2:
The patent segments the medium into multiple detection positions and measures overlap at each position. By dividing the medium into discrete detection points and evaluating overlap continuity across these segments, the system can accurately identify multi-feed conditions while filtering out false positives from adhered objects.
2Reliability
If overlap detection is performed at multiple positions within the medium, then detection coverage is improved, but device complexity increases
Solution Approach 1:
The overlap detection sensor serves multiple functions: it detects overlap at multiple positions, calculates continuous overlap length, and determines multi-feed occurrence. This multi-functional approach improves detection coverage while avoiding the need for separate detection systems for each function, thereby controlling device complexity.
3Measurement precision
If continuous overlap length calculation is implemented, then multi-feed detection accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent implements continuous overlap length calculation by evaluating overlap portions across multiple detection positions and determining their continuity. This continuous measurement approach provides accurate multi-feed detection while using efficient processing algorithms that maintain reasonable computational complexity.
Data Source
AI summary
A medium conveying apparatus includes a conveying roller to convey a medium, an overlap detection sensor, a processor to detect an overlap portion in which it is determined that an overlap has occurred on the medium based on a detection output by the overlap detection sensor for the medium conveyed by the conveying roller, calculate an overlap length where the overlap portion is continuous based on a detection result of the overlap portion, determine whether a multi-feed has occurred based on the overlap length, and execute an abnormal processing for the multi-feed based on a determination result of the multi-feed. The processor determines that a first overlap portion and a second overlap portion are continuous when a distance between the first overlap portion and the second overlap portion is within a predetermined distance in calculating the overlap length.