Image Forming Belt Alignment During Recording Medium Oscillation
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Solution Overview
Problem
In image forming apparatuses, the movement of a belt during registration correction due to the oscillation of a recording medium can affect image quality, particularly when the recording medium is biased in a direction intersecting its conveyance direction, leading to deviations in image positioning.
Innovation Solution
An image forming apparatus with a medium oscillating mechanism, medium sensing section, belt correction mechanism, and belt sensing section, controlled by a hardware processor, performs rectification controls to correct the position of both the recording medium and the belt in the medium width direction, ensuring precise image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If registration correction is performed by oscillating the recording medium while it is in contact with the belt, then the deviation of the recording medium is corrected, but the belt is pulled and moved affecting image formation quality
Solution Approach 1:
The patent extracts the harmful interaction between the oscillating recording medium and the belt by introducing a separation mechanism. The belt is detached from the recording medium during oscillation, preventing the belt from being pulled and moved. This allows registration correction to proceed without compromising belt stability and image formation quality.
Solution Approach 2:
The patent applies preliminary action by separating the belt from the recording medium before oscillation begins. This preventive measure ensures that the belt cannot be pulled during the oscillation process, eliminating the source of the problem while allowing the registration correction to proceed effectively.
2Manufacturing precision
If the recording medium is oscillated to correct deviation, then the image forming position is corrected, but the belt movement occurs during the process
Solution Approach 1:
The patent introduces a control mechanism that acts as an intermediary between the oscillation system and the belt drive system. This intermediary coordinates the timing of belt separation and engagement with the oscillation cycles, managing the complexity through centralized control rather than mechanical complexity.
Solution Approach 2:
The patent applies dynamics by making the belt-b contact relationship dynamic rather than static. The belt is dynamically separated during oscillation and re-engaged afterward, allowing the system to adapt its configuration based on operational requirements. This dynamic approach enables precise control while maintaining simplicity in the mechanical design.
Data Source
AI summary
An image forming apparatus includes the following. A medium oscillating mechanism oscillates the recording medium. A medium sensing section senses a position of an end of the recording medium. A belt correction mechanism is configured to correct a position of a belt. A belt sensing section senses the position of the end of the belt. A hardware processor performs first rectification control in which the medium oscillating mechanism rectifies the position of the end of the recording medium based on sensing by the medium sensing section, and second rectification control in which the belt correction mechanism rectifies the position of the end of the belt based on sensing by the belt sensing section. The hardware processor performs a correction to the second rectification control in a case in which the first rectification control is performed with the recording medium straddling both the medium oscillating mechanism and the belt.