Ultrasonic Multifeed Detection Threshold Calibration
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Solution Overview
Problem
Existing multifeed detection devices face challenges in accurately judging multifeed due to environmental variations, such as temperature and humidity, and may produce incorrect results if the calibration threshold is not properly adjusted, especially when the user environment differs from the calibration environment.
Innovation Solution
A multifeed detection device that includes an ultrasonic emitting unit, an ultrasonic receiving unit, a multifeed judgment unit, and an information acquisition unit, which uses a calibration sheet to adjust the multifeed threshold based on detection intensity values stored on the sheet, ensuring the threshold is valid for the user environment, and includes features like upper-limit and lower-limit thresholds to prevent improper judgments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed multifeed judgment threshold is set based on factory calibration, then the device complexity is reduced and ease of operation is improved, but measurement precision deteriorates due to environmental variations
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple threshold values corresponding to different environmental conditions (temperature, humidity, atmospheric pressure) in a storage device before factory shipment. This allows the system to quickly retrieve and apply the appropriate threshold without requiring real-time environmental measurement or complex calculations, thus maintaining ease of operation while improving measurement precision through environment-specific calibration.
2Measurement precision
If calibration is performed using a sheet for threshold calculation under user environment, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent applies self-service by enabling the ultrasonic sensor adjustment processing to be performed automatically using the stored threshold values and detected environmental parameters. The system self-calibrates by selecting the appropriate pre-stored threshold based on current environmental conditions, eliminating the need for manual calibration operations by users while maintaining high measurement precision.
3Measurement precision
If multiple threshold values are stored for different environmental conditions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by storing multiple threshold values that correspond to different environmental parameters (temperature, humidity, atmospheric pressure). The system selects and applies the appropriate threshold based on the detected environmental conditions, allowing high measurement precision across varying environments without requiring complex real-time adaptation 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
The solution ensures accurate multifeed judgment by using a calibration sheet to determine a proper multifeed threshold suitable for the user environment, reducing detection failures and ensuring the validity of the threshold, thereby improving the reliability of multifeed detection.
Implementation Method 1
an ultrasonic emitting unit that is provided on one of upper and lower sides of a document to be transported in a document transport path and that emits an ultrasonic wave
Implementation Method 2
an ultrasonic receiving unit that is provided on the other side and that receives an ultrasonic wave emitted from the ultrasonic emitting unit
Data Source
AI summary
A multifeed detection device that detects multifeed by using an ultrasonic wave includes an ultrasonic emitting unit and an ultrasonic receiving unit arranged to oppose each other with a medium transport path interposed therebetween; judges occurrence of multifeed of media based on a detection intensity of an ultrasonic wave received by the ultrasonic receiving unit, and a multifeed threshold for judging multifeed of media; and acquires first information that is information relating to adjustment for the multifeed threshold, and second information for specifying that the first information is the information relating to the adjustment for the multifeed threshold, from a calibration sheet holding the first information and the second information.