Duplex Image Forming Control for Paper-Out Waste Prevention
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Solution Overview
Problem
Conventional image forming apparatuses face issues where single-side printed sheets remaining in the apparatus go to waste when duplex image formation is interrupted due to paper-out conditions, leading to inefficiencies and resource wastage.
Innovation Solution
The apparatus incorporates a control method that halts the image forming operation when paper is not fed during duplex operations, allowing completion of image formation on the second surface of sheets already transported, ensuring that single-side printed sheets are properly output and not wasted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the image forming operation is halted when paper is not fed during duplex operations, then paper waste is prevented, but productivity is reduced
Solution Approach 1:
The control section detects paper feed status in advance and proactively halts image forming operations before paper exhaustion occurs. This preliminary detection and response prevents the situation where partially printed sheets would be wasted, thereby resolving the contradiction between preventing paper waste and maintaining productivity.
2Productivity
If the image forming operation continues during paper-out conditions, then productivity is maintained, but single-side printed sheets are wasted
Solution Approach 1:
The control section continuously monitors paper feed status through feedback from detection means and adjusts the image forming operation accordingly. When paper exhaustion is detected, the system provides feedback to halt operations, preventing the waste of single-side printed sheets while maintaining optimal productivity.
Data Source
AI summary
An engine control section detects that a sheet in a cassette is exhausted during duplex image formation. If a sheet with its first surface being printed is on standby in a duplexer, an image formation timing signal is output for a first surface of a sheet not fed because of a paper-out. Subsequently, an image formation timing signal is output for a second surface of the sheet that is in the duplexer and has its first surface printed. After completing the image formation of the second surface of the sheet, the operation is halted.