Medium Conveyance Multi-feed Detection via Slant Correction
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Solution Overview
Problem
Existing medium conveyance apparatuses struggle to accurately determine multi-feed of a medium, especially when a medium with an adhered object is conveyed, leading to false detection and conveyance stoppage.
Innovation Solution
The medium conveyance apparatus includes a storage device for pre-storing region information, a feed roller for feeding the medium, a slant detection module to detect the medium's slant, an overlap detection module to detect overlap regions, a correction module to correct detected region information based on slant, and a multi-feed determination module to accurately determine multi-feed by comparing corrected region information with stored data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a medium conveyance apparatus uses a multi-feed detection unit to detect multi-feed, then multi-feed can be detected, but false detection occurs when a medium with an adhered object (e.g., photograph) is conveyed
Solution Approach 1:
The detection process is divided into multiple independent modules: a multi-feed detection unit that detects overlap regions, a photograph detection unit that detects adhered objects, and a determination unit that integrates both detections. This segmentation allows each module to specialize in its detection task and enables the system to distinguish between true multi-feed and adhered objects by comparing results from different detection approaches.
Solution Approach 2:
The determination unit acts as an intermediary that receives detection results from both the multi-feed detection unit and the photograph detection unit. It compares the overlap region detected by the multi-feed detection unit with the adhered object region detected by the photograph detection unit, and only determines multi-feed when both detections agree, thereby eliminating false positives.
2Ease of operation
If the apparatus stops conveyance when multi-feed is detected, then conveyance control is achieved, but processing time increases due to false stoppages
Solution Approach 1:
The system implements feedback by continuously monitoring both multi-feed detection results and photograph detection results. The determination unit uses this feedback to make informed decisions about whether to stop conveyance, ensuring that stoppages only occur when genuine multi-feed is confirmed rather than when adhered objects are present, thereby reducing unnecessary time losses.
3Measurement precision
If the apparatus detects overlap regions to identify multi-feed, then multi-feed detection capability is provided, but false positives occur when adhered objects create similar overlap patterns
Solution Approach 1:
The system merges the detection results from the multi-feed detection unit and the photograph detection unit in the determination unit. By combining multiple detection approaches and requiring agreement between them, the system achieves more reliable multi-feed determination than either detection method could achieve alone, filtering out false positives from adhered objects.
Data Source
AI summary
Provided are a medium conveyance apparatus, control method, and control program to enable determining whether multi-feed of a medium has occurred by a greater precision. A medium conveyance apparatus includes a storage device to store in advance region information of a predetermined region in a medium, a feed roller to feed the medium, a slant detection module to detect an amount of slant of the fed medium, an overlap detection module to detect region information of a region in which overlap has occurred in the fed medium, a correction module to correct the detected region information based on the amount of slant, and a multi-feed determination module to determine that multi-feed of the medium has occurred if the corrected region information does not correspond to the stored region information and determine that multi-feed of the medium has not occurred if the corrected region information corresponds to the stored region information.