Sonic Wave Detection for Multi-Feeding in Paper Transport
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Solution Overview
Problem
Existing paper transport systems struggle to accurately determine multi-feeding occurrences, especially for papers with varying thickness and types, leading to potential errors in image reading and paper handling.
Innovation Solution
A transport apparatus equipped with a sonic wave detection system using ultrasonic waves to differentiate between single and multi-layered papers by analyzing reception intensity, with a controller determining the likelihood of multi-feeding based on threshold values, allowing for precise handling and image generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-feeding detection sensor is used to determine multi-feeding occurrence, then the ability to detect multi-feeding is improved, but the accuracy of determination deteriorates for papers with varying thickness and types
Solution Approach 1:
The patent replaces the mechanical/optical detection sensor with an acoustic wave-based detection system. The acoustic wave transmitter and receiver emit and detect acoustic waves through the paper, measuring reception intensity to determine paper type and multi-feeding status. This substitution enables accurate detection across varying paper types and thicknesses without relying on mechanical contact or optical reflection properties.
Solution Approach 2:
The patent changes the detection parameter from mechanical/optical properties to acoustic wave reception intensity. By measuring the intensity of acoustic waves transmitted through and received from the paper, the system can distinguish between single-sheet and multi-sheet conditions across different paper types, achieving both reliable detection and precise measurement.
2Productivity
If paper transport continues without accurate multi-feeding determination, then productivity is maintained, but paper breakage increases due to erroneous handling
Solution Approach 1:
The patent implements a feedback mechanism where the acoustic wave reception intensity is continuously monitored during paper transport. The controller uses this feedback information to real-time determine whether multi-feeding has occurred and adjusts transport control accordingly, preventing paper breakage while maintaining continuous operation.
Solution Approach 2:
The system performs preliminary detection of paper type and multi-feeding status using acoustic waves before the paper enters the transport process. This advance identification allows the transport system to prepare appropriate handling parameters in advance, preventing breakage during transport while maintaining productivity.
3Measurement precision
If detection thresholds are set for acoustic wave reception intensity, then multi-feeding determination accuracy is improved, but the complexity of the control system increases
Solution Approach 1:
The acoustic wave detection system performs self-diagnosis and automatic threshold adaptation. The receiver automatically measures reception intensity and the controller automatically compares it against predetermined thresholds to determine paper type and multi-feeding status, eliminating the need for complex manual calibration or external reference systems.
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 system effectively reduces erroneous multi-feeding determinations, ensuring accurate paper transport and image processing by distinguishing between regular and multi-layered papers, thereby minimizing paper breakage and improving operational efficiency.
Implementation Method 1
a sonic wave detection section including a sonic wave transmitter and a sonic wave receiver that are disposed at positions between which the transport path is interposed
Data Source
AI summary
An image reading apparatus includes a transport section configured to transport at least one sheet of paper along a transport path; a sonic wave detection section including a sonic wave transmitter and a sonic wave receiver that are disposed at positions between which the transport path is interposed, the sonic wave detection section being configured to output an output signal having a value that varies in accordance with a reception intensity with which the sonic wave receiver has received a sonic wave transmitted from the sonic wave transmitter; and a controller configured to determine a possibility of an occurrence of multi-feeding based on a result of comparing an output signal by the sonic wave detection section and two threshold value.