Sound-Based Jam Detection Timing Validation
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Solution Overview
Problem
Existing paper conveying apparatuses often erroneously detect jams due to the loud sounds generated by plastic cards or thick papers, leading to unnecessary interruptions and inefficiencies.
Innovation Solution
A paper conveying apparatus equipped with a sound signal generator and detector, which analyzes the sound signals during paper conveyance to differentiate between actual jams and the sounds caused by plastic cards or thick papers, thereby preventing erroneous jam detection by performing abnormal processing only when the predetermined sound signal is not generated at the expected timing.
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 detection from plastic cards or thick paper
Solution Approach 1:
The system dynamically adjusts the evaluation criteria for jam detection by incorporating temporal information. Instead of using a fixed threshold, the system evaluates whether the sound occurs at an expected timing based on paper conveyance state, allowing adaptive detection that distinguishes between genuine jams and normal paper variations
Solution Approach 2:
The system uses feedback from paper conveyance state detection to validate sound-based jam detection. By comparing the detected sound timing with the expected timing based on paper conveyance progress, the system confirms or rejects jam detection results, reducing false positives while maintaining quick detection capability
2Reliability
If sound detection threshold is lowered to detect genuine jams, then reliability is improved, but false detection increases from normal paper sounds
Solution Approach 1:
The system adds a temporal dimension to sound-based jam detection. Instead of evaluating only sound intensity, the system evaluates whether the sound occurs at the expected timing based on paper conveyance state, creating a two-dimensional evaluation (intensity + timing) that distinguishes genuine jams from normal paper sounds
Solution Approach 2:
The system performs preliminary evaluation of paper conveyance state before finalizing jam detection. By determining the expected sound timing based on paper conveyance progress and comparing it with actual sound occurrence, the system prepares validation criteria in advance to filter out false detections
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 effectively suppresses erroneous jam detection, ensuring that only genuine jams trigger abnormal processing, thus enhancing the operational efficiency and reliability of the paper conveying system.
Implementation Method 1
a sound detector near a conveyance path of paper, for generating a sound signal corresponding to a sound generated by a paper during conveyance of the paper
Data Source
AI summary
There are provided a paper conveying apparatus, a jam detection method and a computer-readable, non-transitory medium which can suppress erroneous detection of the occurrence of a jam. The paper conveying apparatus includes a sound signal generator, provided with a sound detector near a conveyance path of paper, for generating a sound signal corresponding to a sound generated by a paper during conveyance of the paper, a sound jam detector for determining whether a jam has occurred based on a predetermined sound signal, and a control module for performing an abnormal processing when the sound jam detector determines that the jam has occurred and the predetermined sound signal is not generated at a predetermined timing, and determining that the jam has not occurred and not performing the abnormal processing when the sound jam detector determines that the jam has occurred and the predetermined sound signal is generated at the predetermined timing.