Paper Conveyance Jam Detection Using Dynamic Sound Analysis
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Solution Overview
Problem
Paper conveying apparatuses often mistakenly detect jams due to the loud sounds generated when conveying plastic cards or thick papers, leading to incorrect jam determinations.
Innovation Solution
The apparatus includes a sound signal generator and a sound jam detector that determines whether a jam has occurred based on sound signals, with a control module adjusting the detection method or disabling jam detection when conveying cards or thick papers to prevent false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sound-based jam detection is used to detect jams quickly, then productivity is improved, but measurement precision deteriorates due to false positives from loud sounds during card or thick paper conveyance
Solution Approach 1:
The patent applies dynamics by making the jam detection function adjustable based on the conveyed object. The control module dynamically switches between sound-based detection (for quick detection during normal paper conveyance) and position-based detection (for cards and thick papers that generate loud sounds). This dynamic adaptation resolves the contradiction by selecting the appropriate detection method based on the current conveyance conditions.
Solution Approach 2:
The patent changes the detection parameters based on the type of paper being conveyed. When cards or thick papers are detected (via paper thickness detection), the system changes from using sound level thresholds to using paper position detection. This parameter change allows the system to maintain high productivity during normal operation while avoiding false positives during card conveyance.
2Measurement precision
If sound threshold is set low to detect jams accurately, then measurement precision is improved, but object-generated harmful factors worsen due to false jam detection from normal loud sounds
Solution Approach 1:
The patent introduces an intermediary detection mechanism (paper thickness detection) that mediates between the sound detection and the jam determination. When the intermediary detects cards or thick papers, it triggers a mode switch to position-based detection, preventing the sound detection from causing false positives. This intermediary layer resolves the contradiction by filtering out conditions where sound-based detection would be harmful.
Solution Approach 2:
The system dynamically adjusts the detection method based on the conveyed object type. During normal paper conveyance, sound-based detection with low thresholds provides accurate jam detection. When cards or thick papers are conveyed, the system switches to position-based detection, eliminating false positives while maintaining the ability to detect actual jams.
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 approach effectively suppresses mistaken jam determinations by altering the detection method or disabling it during card or thick paper conveyance, ensuring accurate operation of the paper conveying apparatus.
Implementation Method 1
a sound signal generator for generating a sound signal corresponding to a sound generated by a paper during conveyance of the paper
Data Source
AI summary
Provided is a paper transporting device and the like capable of suppressing errors in determining jam occurrences. A paper transporting device has: a transport mechanism; an audio signal output unit that outputs an audio signal according to the sound generated during paper transport; an audio jam determination unit that determines, on the basis of the audio signal, whether a jam has occurred; and a control unit that stops paper transport when the audio jam determination unit determines that a jam has occurred. The control unit controls, in the case of card stock or paperboard being transported by the transport mechanism, so that the audio jam determination unit determines whether a jam has occurred at predetermined times using a determination method that is different than the method at other times or so that the audio jam determination unit does not determine whether a jam has occurred.