Paper Jam Detection via Thickness-Adaptive Frequency Analysis
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Solution Overview
Problem
Existing paper conveying apparatuses face challenges in precisely detecting paper jams across various types of paper, as the amplitude strength of frequency components differs by paper type, leading to inconsistent jam detection.
Innovation Solution
A paper conveying apparatus equipped with a sound signal generator, a paper thickness setting module, and a sound jam detector that determines jam occurrence based on specific frequency bands in the sound signal, with the frequency band settings adjusted according to the paper thickness, allowing for precise jam detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed frequency component is used for jam detection, then the detection method is simple, but the detection precision varies for different paper types
Solution Approach 1:
The patent applies dynamics by making the frequency band setting changeable based on paper thickness. Instead of using a fixed frequency component for all paper types, the system dynamically adjusts the frequency band according to the detected paper thickness, allowing optimal jam detection for each paper type while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent changes the frequency band parameter based on paper thickness. By detecting paper thickness first and then selecting the appropriate frequency band accordingly, the system adapts the detection parameters to match different paper types, thereby improving detection precision without requiring a completely complex system redesign.
2Adaptability or versatility
If general jam detection is used, then all paper types can be detected, but the detection accuracy varies across different paper types
Solution Approach 1:
The patent applies local quality by tailoring the frequency band setting to match each paper type's characteristics. Instead of using a one-size-fits-all approach, the system detects paper thickness and applies specific frequency band settings optimized for each paper type, thereby achieving high detection accuracy for each local case while maintaining versatility across all paper types.
Solution Approach 2:
The system dynamically adapts the frequency band setting based on the detected paper thickness. This dynamic adjustment allows the system to maintain compatibility with various paper types while achieving high detection accuracy for each specific type, resolving the contradiction between versatility and precision.
3Measurement precision
If paper thickness detection is added, then jam detection precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by detecting paper thickness before performing jam detection. By first identifying the paper thickness and then selecting the appropriate frequency band setting, the system prepares the optimal detection parameters in advance, which improves jam detection precision without requiring a fundamentally complex system architecture.
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
Enables accurate detection of paper jams for different paper types by minimizing noise interference and effectively identifying jam-specific frequency bands, ensuring reliable operation across various paper thicknesses.
Implementation Method 1
a sound detector near a conveyance path of a 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 precisely determine any occurrence of a jam by a sound which is generated by paper for various types of paper. The paper conveying apparatus includes a sound signal generator, provided with a sound detector near a conveyance path of a paper, for generating a sound signal corresponding to a sound generated by a paper during conveyance of the paper, a paper thickness setting module for setting a thickness of a paper conveyed to the conveyance path, and a sound jam detector for determining whether a jam has occurred based on a signal of a specific frequency band in the sound signal, wherein the sound jam detector determines the specific frequency band based on a thickness of the paper.