Document Feeding Device Statistical Distance Control
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Solution Overview
Problem
Existing medium feeding devices in image reading systems are prone to erroneous determination of transport abnormalities due to measurement errors at single time points, leading to unnecessary cessation of document feeding.
Innovation Solution
A medium feeding device with a measuring unit that statistically processes time series data of distance measurements to determine whether to stop feeding, using moving average values over different time periods to reduce error factors and enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If distance measurement is performed at a single time point to determine feeding status, then the response speed is fast, but measurement precision deteriorates due to error factors
Solution Approach 1:
The system performs preliminary distance measurements at multiple time points before making a final determination. By collecting distance data at multiple time points (T1, T2, T3, ...) and performing statistical processing to calculate average distance and standard deviation, the system prepares accurate baseline data before determining feeding status, thereby reducing the impact of single-timepoint measurement errors.
2Measurement precision
If multiple time series measurements are performed and statistically processed, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The control unit continuously monitors distance measurements and performs statistical processing to generate feedback about feeding status. By calculating average distance and standard deviation from multiple measurements, the system creates a feedback mechanism that automatically adjusts feeding control decisions, improving precision while keeping the control logic systematic and manageable.
Data Source
AI summary
A document feeding device includes a document placement unit at which a document is placed, a feeding roller for feeding the document, and a ranging sensor for measuring a distance to the document located most upward on the document placement unit. A control unit stops feeding the document by the feeding roller based on post-processing distance data obtained by statistically processing time series data of the distance measured by the ranging sensor.