Dual Correction Mode for Image Position Displacement
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Solution Overview
Problem
High-speed image forming apparatuses face challenges in maintaining precise positional matching of the image forming position on a recording sheet and the image writing position onto an image bearing member, especially when sudden displacements occur in the sheet transport position due to factors like heat expansion or paper replenishment, leading to poor image quality.
Innovation Solution
The implementation of a dual correction mode system, where a high speed correction mode and a linear correction mode are switched based on the detected correction amount for a preset number of recording sheets, allowing for precise adjustment of the image writing position using sheet transport position detecting portions to ensure accurate alignment even during high-speed printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed image formation is implemented, then productivity is improved, but manufacturing precision (positional matching accuracy) deteriorates
Solution Approach 1:
The system performs preliminary detection of sheet transport position using the sheet transport position detecting portion before image formation begins. The detected position information is stored and used for subsequent correction, allowing the image writing position to be adjusted in advance based on detected displacements, thus maintaining precision at high speeds
Solution Approach 2:
The system continuously monitors sheet transport position through the sheet transport position detecting portion and feeds this information back to the control unit. Based on this feedback, the control unit calculates correction amounts and adjusts the image writing position accordingly, creating a closed-loop correction system that maintains precision during high-speed operation
2Manufacturing precision
If sheet transport position is detected for all recording sheets, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The system performs detection and correction processing in advance for a preset number of recording sheets before actual image formation begins. This preliminary correction establishes a baseline position that can be used for subsequent sheets without requiring continuous detection, thereby reducing real-time processing time while maintaining precision
Solution Approach 2:
Instead of detecting and correcting the position for every single recording sheet individually, the system performs detection for a preset number of sheets (excessive action in terms of detection volume) and then uses this data to establish correction parameters that apply to subsequent sheets, reducing the overall time required for continuous operation
Data Source
AI summary
An image forming apparatus includes a high speed correction mode in which, at the time of a successive image forming process on a plurality of recording sheets, a preset number of recording sheets among the plurality of recording sheets are subjected to image formation based on a corrected image writing position, and other recording sheets are subjected to image formation based on the corrected image writing position; and a linear correction mode in which the plurality of recording sheets are subjected to image formation based on the corrected image writing position; and performs switching to either one of the high speed correction mode and the linear correction mode according to a correction amount βb for a recording sheet detected at the time of image formation with respect to a correction amount βa for the preset number of recording sheets.