Duplex Sheet Type Detection for Jam-Resistant Image Forming
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Solution Overview
Problem
Existing image forming apparatuses face issues with paper jams during duplex printing due to the inability to accurately detect sheet type before feeding, leading to mismatched handling of sheets with different properties.
Innovation Solution
The apparatus includes a detection unit on the conveyance path to identify sheet type and a control unit that adjusts the order of image formation based on sheet type, ensuring that sheets with the same or different properties are processed appropriately to prevent jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sheet type detection is performed after sheet feeding, then the detection structure is simple, but paper jams occur during duplex printing due to mismatched handling of sheets with different properties
Solution Approach 1:
The detection unit detects the type of sheet to be fed before the sheet is actually fed to the image forming unit. This preliminary detection allows the control unit to adjust conveyance conditions, circulation path selection, and image formation parameters in advance, preventing paper jams during duplex printing by ensuring appropriate handling conditions are established before the sheet enters the printing process.
2Reliability
If sheets are conveyed continuously without type detection, then the conveyance process is simple and fast, but sheets with different properties are handled incorrectly causing jams
Solution Approach 1:
The detection unit provides real-time feedback about sheet type to the control unit, which then adjusts conveyance conditions and circulation path selection accordingly. This feedback mechanism ensures that each sheet is handled according to its specific properties while maintaining continuous conveyance operation, preventing jams without significantly reducing productivity.
3Productivity
If the circulation path is used for duplex printing, then printing efficiency is improved, but paper jams occur when sheet types mismatch between storage unit and circulation path
Solution Approach 1:
Before conveying a sheet to the image forming unit, the control unit checks whether a sheet of the same type exists on the circulation path. If a mismatch is detected, the control unit adjusts the conveyance destination or circulation path selection in advance, preventing paper jams while maintaining the efficiency benefits of the circulation path for duplex printing.
Data Source
AI summary
In a case where a type of a feeding standby sheet on a storage unit and a type of a refeeding standby sheet on a reconveyance path are the same, an image forming unit forms an image on one side of a feeding standby sheet on the storage unit, and in a case where a type of a feeding standby sheet on the storage unit and a type of a refeeding standby sheet on the reconveyance path are not the same, the image forming unit forms an image on another side of a refeeding standby sheet on the reconveyance path.