Sheet Feeding Control for Image Forming Apparatus
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Solution Overview
Problem
Existing image forming apparatuses fail to prevent sheets placed by one user from being fed into print jobs submitted by another user, leading to inappropriate use of special or expensive sheets.
Innovation Solution
An image forming apparatus with multiple sheet feeding units, a detection unit to identify sheet features, and a control unit that prevents feeding from a sheet feeding unit if the detection is not performed or if the sheet type is not specified, ensuring that only intended sheets are used for printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sheet feeding unit is automatically selected from multiple sheet feeding units, then the ease of operation is improved, but sheets placed by one user may be incorrectly fed into print jobs submitted by another user
Solution Approach 1:
The detection unit measures feature amounts of sheets in each sheet feeding unit and provides feedback to the control unit. The control unit uses this feedback information to determine whether to select a sheet feeding unit, preventing automatic selection when sheet type cannot be confirmed. This resolves the contradiction by making the automatic selection process reliable through continuous monitoring and feedback.
Solution Approach 2:
The detection unit acts as an intermediary between the sheet feeding units and the control unit. It measures sheet feature amounts and communicates this information to the control unit, which uses it to make informed decisions about sheet feeding unit selection. This intermediary prevents incorrect sheet feeding by providing verification information.
2Manufacturing precision
If the detection unit measures sheet feature amounts for all sheet feeding units, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
A single detection unit is designed to measure multiple feature amounts (length, width, thickness, density) of sheets in all sheet feeding units. This multi-functional detection unit achieves high sheet type identification accuracy without requiring separate detection systems for each sheet feeding unit, thereby reducing overall device complexity while maintaining precision.
3Reliability
If the control unit restricts sheet feeding to only detected sheet types, then the reliability is improved, but the productivity decreases
Solution Approach 1:
The detection unit performs preliminary measurement of sheet feature amounts before the print job execution. The control unit stores this detection information in advance and uses it to quickly determine sheet feeding unit selection during print job processing. This preliminary action ensures reliable sheet type identification while maintaining high productivity during actual printing.
Solution Approach 2:
The control unit dynamically adjusts sheet feeding unit selection based on real-time detection information and print job requirements. When detection information is available and matches job requirements, feeding proceeds normally. When detection information is unavailable or mismatched, the system dynamically prevents feeding. This dynamic control ensures both reliability and productivity.
Data Source
AI summary
In a case where the type of a sheet placed in a sheet feeding unit as an automatic selection target is not distinguished using a medium sensor, an image forming apparatus does not feed the sheet from the sheet feeding unit.