Belt Deviation Correction in Image Forming Apparatus
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Solution Overview
Problem
Conventional image forming apparatuses face issues with belt member deviation during continuous operation, leading to image quality deterioration, especially with short-time jobs and large deviations, where steering control corrections are performed during job execution, causing unnecessary image deterioration.
Innovation Solution
An image forming apparatus with a control unit that compares the belt member's position at the end of a job to a determination threshold, selecting between a first control mode to stop steering control if within threshold and a second control mode for correction if beyond, performing a larger correction operation when necessary, and calculating an estimated return position based on job duration and movement to adjust the belt member's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If steering control is performed during job execution to correct belt member deviation, then belt position accuracy is improved, but image quality deteriorates due to correction operations interfering with image formation
Solution Approach 1:
The control unit performs preliminary assessment of belt position at job start and determines whether correction is needed before image formation begins. Correction operations are scheduled to complete before the job starts, preventing interference with image quality while ensuring belt position accuracy is restored in advance
2Manufacturing precision
If steering control is continuously performed to correct accumulated deviation, then belt member position accuracy is improved, but productivity decreases due to extended correction operations during short-time jobs
Solution Approach 1:
The control unit calculates estimated correction time before job execution and compares it with the job duration. If correction can be completed preliminarily before the job starts, it proceeds with correction; otherwise, it delays correction until after the job completes, ensuring productivity is maintained while still achieving necessary position correction
Solution Approach 2:
The control system dynamically adjusts the timing and amount of correction operations based on real-time belt position detection and job characteristics. The control amount is optimized to achieve necessary correction with minimal operation time, adapting to varying job durations and deviation magnitudes
3Manufacturing precision
If large amount of correction is applied to fix significant deviation, then belt member returns to reference position, but image quality deteriorates and output becomes useless
Solution Approach 1:
The control unit determines whether large correction is needed before image formation begins. When significant deviation is detected preliminarily, correction operations are executed to restore belt position before the job starts, ensuring both effective correction and protection of image quality by avoiding interference during image formation
Data Source
AI summary
An image forming apparatus includes: a belt member configured to be rotationally operated at least during performance of a job; an adjustment mechanism configured to adjust the position of the belt member; a detection unit configured to detect the position of the belt member; and a control unit configured to control the adjustment mechanism during performance of a job, and perform steering control for correcting deviation of the belt member, the control unit comparing the position of the belt member at the end of a job, and a determination threshold for determining deviation of the belt member from a belt reference position, and selecting a control mode relating to the steering control, according to a result of the comparison.