Sound Detector Placement for Jam Detection in Image Readers
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Solution Overview
Problem
Existing image reading apparatuses face challenges in effectively detecting jams of various types due to varying sound generation positions, which hinders accurate jam detection without noise interference.
Innovation Solution
The apparatus includes microphones strategically placed between the paper feed and conveyor rollers near the side walls to detect sound signals generated during paper conveyance, allowing for effective detection of skew and staple jams while minimizing noise from wrinkles and external sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound detection is performed at a fixed position in the conveyance path, then the detection structure is simple, but the detection accuracy varies for different jam types
Solution Approach 1:
The detection system is segmented into multiple sound detectors positioned at different locations (first sound detector near the separator, second sound detector near the conveying module). Each detector monitors specific zones where different jam types occur, enabling accurate detection of various jam types without requiring a single complex detection structure
Solution Approach 2:
The detection approach transitions from a single-point detection to multi-point spatial detection. By distributing sound detectors along the conveyance path at different positions, the system creates a spatial detection network that can identify jams at various locations, improving detection accuracy while maintaining relatively simple individual detector structures
2Reliability
If sound detection is performed throughout the entire conveyance path, then all jam types can be detected, but noise interference increases
Solution Approach 1:
Sound detectors are strategically positioned at specific locations where jams most commonly occur (near the separator and near the conveying module). This localized detection approach focuses monitoring resources on high-risk zones, improving detection reliability while minimizing exposure to noise from other areas of the conveyance path
Solution Approach 2:
The detection system extracts and monitors only the sound signals from specific critical zones rather than processing sounds from the entire conveyance path. By isolating detection to key areas where jams occur, the system maintains high reliability while reducing noise interference from non-critical regions
3Adaptability or versatility
If a single sound detector is used, then the device structure is simple, but the detection coverage for different jam types is insufficient
Solution Approach 1:
The detection system is divided into multiple detector units positioned at different locations along the conveyance path. Each detector covers a specific zone, and together they provide comprehensive coverage for different jam types while keeping each individual detector unit relatively simple in 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
This configuration enables precise detection of jams, reducing noise interference and allowing for immediate conveyance stoppage to prevent paper damage, thereby enhancing jam detection accuracy and preventing paper tearing.
Implementation Method 1
a sound signal generator, provided with a sound detector between the separator and the conveying module and near the side wall, for generating a sound signal corresponding to a sound generated by the paper during conveyance of the paper
Data Source
AI summary
An image reading apparatus includes a separator, an image reader for reading an image from a paper, a conveying module for conveying a paper separated by the separator to the image reader, a side wall provided at a side of a conveyance path of the paper, a sound signal generator, provided with a sound detector between the separator and the conveying module and near the side wall, for generating a sound signal corresponding to a sound generated by the paper during conveyance, and a control module for determining whether a jam has occurred based on the sound signal.