Transfer Rotator Velocity Adjustment for Image Magnification Control
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Solution Overview
Problem
Image forming apparatuses face challenges in maintaining consistent image magnification across different image area rates during the transfer process, leading to variations in image size due to differences in linear velocity and contact pressure at the transfer nip.
Innovation Solution
An image forming apparatus with an adjuster that adjusts the relative linear velocity and contact pressure between the transfer rotator and image bearer at the transfer nip, utilizing circuitry to reduce image magnification differences based on detected image area rates, ensuring consistent image size regardless of the image area rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the transfer rotator and image bearer maintain fixed linear velocities and contact pressure, then the transfer process is simple and stable, but image magnification varies with different image area rates
Solution Approach 1:
The patent applies dynamics by making the transfer rotator's linear velocity adjustable rather than fixed. The adjuster dynamically changes the rotational speed of the transfer rotator based on image area rate detection, allowing the system to adapt transfer parameters to different printing conditions and maintain consistent image magnification across various image area rates.
Solution Approach 2:
The patent implements parameter changes by modifying the linear velocity of the transfer rotator according to the detected image area rate. The control unit adjusts operational parameters (rotational speed) based on feedback from image area rate detection, enabling the system to compensate for magnification variations and maintain consistent image quality.
2Productivity
If the linear velocity difference between transfer rotator and image bearer is increased to improve transfer speed, then productivity increases, but image magnification control deteriorates
Solution Approach 1:
The system dynamically adjusts the linear velocity of the transfer rotator based on real-time detection of image area rate. This allows the system to optimize transfer speed for different image densities while maintaining precise magnification control, resolving the trade-off between productivity and precision.
Solution Approach 2:
The patent employs feedback control where the image area rate detection unit monitors the actual printing conditions and feeds this information back to the control unit. The control unit then adjusts the transfer rotator's velocity accordingly, creating a closed-loop system that maintains both high productivity and precise image magnification control.
Data Source
AI summary
An image forming apparatus includes an image bearer, a transfer rotator, an adjuster, and circuitry. The image bearer bears a toner image. The transfer rotator contacts the image bearer to form a transfer nip between the transfer rotator and the image bearer. The transfer rotator transfers the toner image from the image bearer onto a sheet conveyed to the transfer nip. The adjuster adjusts at least one of a relative difference in linear velocity of the transfer rotator to the image bearer at the transfer nip and a relative contact pressure of the transfer rotator to the image bearer at the transfer nip. Based on a difference in image magnification, in a direction of conveyance of the sheet, of toner images transferred onto surfaces of one or more sheets conveyed to the transfer nip, the circuitry causes the adjuster to reduce the difference in image magnification.