Duplex Printing Error Handling via Segmented Driving Systems
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Solution Overview
Problem
Conventional printers terminate print jobs and waste resources when encountering multi-feed or paper jam errors, requiring users to clear issues before restarting, leading to unfinished documents and resource wastage.
Innovation Solution
A duplex printing method utilizing a sheet-controlling device and two independent driving systems to continue the print process without interruption, prioritizing ongoing image formation over error clearance by inhibiting new sheet entry and completing printing on sheets already in the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the printer terminates the print job immediately upon detecting a sheet-feeding error, then the paper jam or misfeed can be cleared quickly, but the print process is interrupted and resources are wasted
Solution Approach 1:
The patent segments the printing system into two independent driving systems: one for transporting sheets and another for forming images. This segmentation allows the image-forming process to continue independently even when sheet feeding encounters errors, enabling error clearance without interrupting the print process.
Solution Approach 2:
The patent implements preliminary actions by having the sheet-transporting system stop advancing new sheets upon detecting errors, while the image-forming system continues processing sheets already in the transport path. This preliminary separation of concerns allows error clearance to proceed without affecting ongoing image formation.
2Productivity
If the printer continues the print process without interruption during sheet-feeding errors, then productivity is maintained, but the system complexity increases
Solution Approach 1:
The patent divides the driving system into two independent subsystems: a sheet-transporting driving system and an image-forming driving system. Each system can operate independently, allowing the image-forming system to continue working while the sheet-transporting system handles errors, thus maintaining productivity without requiring a completely complex integrated system.
Solution Approach 2:
The patent introduces a controller as an intermediary that coordinates between the two independent driving systems. The controller receives error signals from the sheet-feeding system and appropriately controls the image-forming system to continue operation, managing the complexity through centralized coordination rather than direct mechanical coupling.
3Loss of energy
If the printer prioritizes ongoing image formation over error clearance, then resource waste is reduced, but the sheet-transporting system must be stopped
Solution Approach 1:
The patent implements preliminary action by having the sheet-transporting system stop advancing new sheets immediately upon detecting errors, while the image-forming system continues processing sheets already in the transport path. This preliminary separation allows error clearance to proceed without affecting ongoing image formation, preventing waste of toner and paper.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining the image-forming process even when sheet feeding is interrupted. The image-forming system continues to operate on sheets already in the transport path, ensuring that the valuable image formation process is not interrupted by sheet-feeding errors, thus reducing resource waste.
Data Source
AI summary
A duplex printing method performed by a printing apparatus comprises the steps of feeding in a first sheet; transporting the first sheet along a sheet-circulating path; forming an image on a front side of the first sheet when the first sheet is transported past an image forming system of the printing apparatus at a first time; feeding in a second sheet; detecting a sheet-feeding error; inhibiting an entry of the second sheet into the sheet-circulating path; forming an image on a back side of the first sheet when the first sheet is transported past the image forming system at a second time; and ejecting the first sheet.