Paper Conveyance Jam Detection via Sound Shielding
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Solution Overview
Problem
Existing paper conveyance apparatuses face decreased detection accuracy of jams due to overlapping sounds other than those generated by jam occurrence, which affects the reliability of jam detection.
Innovation Solution
The apparatus includes a conveyance roller module, sound receiving apertures, sound shields positioned between the nip portion and the apertures, and sound signal generators to determine jam occurrence based on sound signals, reducing interference from conveyance and separation sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microphone is used to detect sound in the conveyance path for jam detection, then jam detection capability is provided, but detection accuracy decreases due to overlapping sounds from conveyance and separation operations
Solution Approach 1:
The patent extracts and removes the harmful sound components from the detection system by introducing sound shields that block sounds from the conveyance roller module and separation roller. This allows the microphone to detect only the relevant jam sounds without interference from normal operation sounds, thereby resolving the contradiction between providing jam detection capability and maintaining high detection accuracy.
Solution Approach 2:
The sound shields act as intermediary elements between the sound sources (conveyance roller module, separation roller) and the microphone. These shields mediate the sound transmission by blocking unwanted sounds while allowing the microphone to still detect jam sounds, thus resolving the contradiction between having jam detection capability and maintaining detection accuracy.
2Measurement precision
If sound shields are added to block conveyance and separation sounds from the microphone, then detection accuracy of jam occurrence is improved, but device complexity increases
Solution Approach 1:
The sound shields serve multiple functions: they block conveyance sounds, block separation sounds, and allow jam sounds to pass through to the microphone. By making the shields multi-functional, the patent improves detection accuracy without requiring multiple separate components, thus minimizing the increase in device complexity.
Solution Approach 2:
The sound shields are implemented as thin partition walls that are simple in structure but effective in function. These thin film-like structures provide the necessary sound blocking capability while adding minimal complexity to the overall device structure, resolving the contradiction between improving detection accuracy and maintaining simple device structure.
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 enhances the detection accuracy of jam occurrence by shielding conveyance and separation sounds, thereby improving the reliability of jam detection in the paper conveyance apparatus.
Implementation Method 1
a sound shield positioned on a straight line between a nip portion of the conveyance roller module and the sound receiving aperture
Implementation Method 2
a sound signal generator for generating a sound signal in response to a sound detected through the sound receiving aperture
Data Source
AI summary
A paper conveyance apparatus including a conveyance roller module including a pair of a sheet feeding roller and a separation roller opposite to each other across a paper conveyance path, a sound receiving aperture positioned on the same side as one side of the paper conveyance path, the one side including any one of the conveyance roller module, a sound shield positioned on a straight line between a nip portion of the conveyance roller module and the sound receiving aperture, a sound signal generator for generating a sound signal in response to a sound detected through the sound receiving aperture, and a sound jam detector for determining whether a jam has occurred based on the sound signal.