Dual Sound Sensor Jam Detection for Paper Conveyance
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Solution Overview
Problem
Existing paper conveying systems often erroneously detect jams due to sounds generated during paper conveyance, such as wrinkles or skewing, leading to unnecessary apparatus shutdowns.
Innovation Solution
The implementation of a paper conveying apparatus with first and second sound signal generators positioned perpendicularly across the conveyance path at both ends, allowing a sound jam detector to determine jam occurrence based on the difference between the sound signals, thereby distinguishing between actual jams and noise from paper wrinkles or skewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single sound signal generator is used to detect jams, then the detection speed is improved, but the measurement precision deteriorates due to erroneous detection from paper wrinkles or skewing
Solution Approach 1:
The single sound detection function is segmented into multiple sound signal generators positioned at different locations (one end and the other end of the conveyance path). Each generator independently monitors sound in its local area, and the control unit compares signals from multiple positions to distinguish actual jams from transient noise caused by paper wrinkles or skewing, thereby maintaining fast detection while improving accuracy.
2Productivity
If sound-based jam detection is implemented, then the productivity is improved by early jam detection, but the reliability deteriorates due to erroneous detection from paper conveyance noise
Solution Approach 1:
Different locations along the conveyance path are assigned different monitoring functions. Sound signal generators are strategically positioned at one end and the other end of the conveyance path to capture local sound characteristics. The control unit analyzes the spatial distribution and temporal patterns of sound signals from these different locations to reliably distinguish between normal conveyance noise and actual jam conditions, ensuring high detection reliability while maintaining productivity.
3Measurement precision
If multiple sound signal generators are positioned at both ends of the conveyance path, then the measurement precision is improved by reducing erroneous detection, but the device complexity increases
Solution Approach 1:
Multiple sound signal generators and their signal processing functions are merged into an integrated detection system controlled by a single control unit. The control unit receives signals from all sound signal generators, performs comparative analysis, and makes unified jam detection decisions. This merging approach maintains high measurement precision through multi-point monitoring while reducing overall system complexity by centralizing the control logic and decision-making process.
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 reduces erroneous jam detection, ensuring accurate identification of jams and preventing unnecessary system shutdowns by filtering out noise from paper wrinkles and skewing, thus enhancing operational reliability.
Implementation Method 1
a first sound signal generator for generating a first 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 that can suppress erroneous detection of an occurrence of a jam by sound due to the sound generated along with conveyance of a paper. The paper conveying apparatus includes a first sound signal generator for generating a first sound signal corresponding to a sound generated by a paper during conveyance, at least a part of the first sound signal generator is provided at one end of a conveyance path of the paper, a second sound signal generator for generating a second sound signal corresponding to the sound, at least a part of the second sound signal generator is provided at the other end of the conveyance path, and a sound jam detector for determining whether a jam has occurred based on a difference of the first sound signal and the second sound signal.