Sheet Feeding Coils for Foreign Object Detection
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Solution Overview
Problem
Existing sheet processing apparatuses face challenges in accurately detecting foreign objects due to environmental effects, such as temperature changes, without increasing the number of parts.
Innovation Solution
A sheet processing apparatus equipped with a plurality of coils in the feeding section that generate magnetic fields, and a control section that determines foreign object entry based on differential values between coil signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors or reference coils are added to correct environmental effects, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The existing coils serve dual purposes: both feeding the sheet and detecting foreign objects. The control section performs self-diagnosis by analyzing differential values between coil signals, eliminating the need for separate detection coils or temperature sensors.
Solution Approach 2:
The coils are designed to perform multiple functions simultaneously - sheet feeding and foreign object detection. The control section also performs multiple functions by both controlling the coils and analyzing their signals for diagnostic purposes.
2Measurement precision
If multiple coils are used for foreign object detection, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The existing feeding coils are utilized for both their original purpose of sheet feeding and the additional function of foreign object detection. No separate detection coils are added to the system.
Solution Approach 2:
The coils perform self-diagnosis by comparing differential values between their own signals. The control section analyzes variations in coil signals to detect foreign objects without requiring additional dedicated detection components.
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 solution enhances the accuracy of foreign object detection while minimizing the increase in the number of parts, effectively addressing environmental interference without the need for additional sensors or coils.
Implementation Method 1
a plurality of coils that are provided in a feeding section which feeds a sheet that has been taken in into a transport path and that generate magnetic fields
Data Source
Figure 1
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Figure 4
AI summary
A sheet processing apparatus (1) includes a plurality of coils that are provided in a feeding section which feeds a sheet that has been taken in into a transport path and that generate magnetic fields and a control section that determines, on the basis of differential values between signals output from the plurality of coils, whether a foreign object has entered the feeding section.