Medium Conveying Apparatus Multi-feed Detection Logic
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Solution Overview
Problem
Existing medium conveying apparatuses face challenges in accurately detecting multi-feed conditions, leading to potential damage and inefficiencies in medium handling, as they rely on ultrasonic wave transmission and signal comparison with determination thresholds, which can result in erroneous detection due to variations in signal intensity caused by the medium's ends being within the detection area.
Innovation Solution
A medium conveying apparatus equipped with a conveying roller, an end detection sensor, an overlap detection sensor, and a processor that determines the validity of overlap detection based on the positional relationship between the medium's end and the detection area, executing abnormality processing only when the detection is valid, thereby preventing erroneous multi-feed determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultrasonic wave transmission detection is used to detect multi-feed, then multi-feed detection capability is provided, but erroneous detection occurs when medium ends are within the detection area
Solution Approach 1:
The system performs preliminary detection of the medium end position using an end detection sensor before conducting overlap detection. Based on the detected end position, the system determines in advance whether the medium end is located within the detection area of the ultrasonic sensor, and only executes overlap detection when the end is outside the detection area, thereby preventing erroneous detection.
Solution Approach 2:
The patent introduces an end detection sensor as an intermediary device to detect the position of the medium end. This intermediary detection mechanism provides positional information that is used to control whether the ultrasonic overlap detection should be executed, acting as a gatekeeper to prevent erroneous detection.
2Productivity
If overlap detection is continuously performed in the detection area, then multi-feed detection coverage is maximized, but false detection increases when medium ends pass through the detection area
Solution Approach 1:
The system performs preliminary detection of the medium end position using an end detection sensor before conducting overlap detection. Based on the detected end position, the system determines in advance whether the medium end is located within the detection area of the ultrasonic sensor, and only executes overlap detection when the end is outside the detection area, thereby preventing erroneous detection.
Solution Approach 2:
The patent applies different detection strategies in different spatial regions. When the medium end is detected to be outside the ultrasonic detection area, overlap detection is performed with high reliability. When the medium end is within the detection area, overlap detection is invalidated to avoid false positives. This spatially differentiated approach optimizes both coverage and reliability.
3Adaptability or versatility
If signal comparison with determination threshold is used, then multi-feed detection function is implemented, but detection accuracy decreases due to signal intensity variations
Solution Approach 1:
The patent introduces an end detection sensor as an intermediary device to detect the position of the medium end. This intermediary detection mechanism provides positional information that is used to control whether the ultrasonic overlap detection should be executed, acting as a gatekeeper to prevent erroneous detection.
Solution Approach 2:
The system performs preliminary detection of the medium end position using an end detection sensor before conducting overlap detection. Based on the detected end position, the system determines in advance whether the medium end is located within the detection area of the ultrasonic sensor, and only executes overlap detection when the end is outside the detection area, thereby preventing erroneous detection.
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
This solution enhances the accuracy of multi-feed detection, preventing damage to the medium and improving handling efficiency by differentiating between actual multi-feed conditions and signal variations caused by the medium's ends within the detection area.
Implementation Method 1
an end detection sensor for detecting a position of an end of the medium conveyed by the conveying roller
Implementation Method 2
a multi-feed detection apparatus to determine whether or not the multi-feed of the medium has occurred based on a transmission amount of an ultrasonic wave transmitted through a medium using an ultrasonic sensor
Data Source
AI summary
A medium conveying apparatus includes a conveying roller to convey a medium, an end detection sensor for detecting a position of an end of the medium conveyed by the conveying roller, an overlap detection sensor for detecting an overlap of the medium conveyed by the conveying roller in a detection area, and a processor to determine whether an overlap detection is valid or invalid based on a positional relationship between the position of the end of the medium detected by the end detection sensor and the detection area, and execute an abnormality processing for multi-feed based on a detection result by the overlap detection sensor when it is determined that the overlap detection is valid.