Image Forming Apparatus Interpage Gap Control for Thick Media
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Solution Overview
Problem
Conventional image forming apparatuses experience color shift issues when printing on thick, rigid recording media due to inconsistent interpage gaps, leading to positional errors and image quality degradation.
Innovation Solution
An image forming apparatus with a controller that adjusts the interpage distance based on the thickness of the recording medium, ensuring the distance between the trailing edge of one page and the leading edge of the next page is either longer or shorter than the distance between the nips at the most upstream and downstream image forming sections, depending on the medium's thickness, to maintain consistent image placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the recording medium is thick and rigid, then the recording medium is difficult to flex and moves relative to the transfer belt, but this causes positional errors and color shift in the printed image
Solution Approach 1:
The system dynamically adjusts the interpage gap based on the detected thickness of the recording medium. When thick media is detected, the controller increases the gap between consecutive sheets to account for the relative movement between the paper transport mechanism and transfer belt, thereby maintaining positional accuracy despite the medium's rigidity
Solution Approach 2:
The controller changes the transport parameters (interpage gap distance) according to the physical parameters (thickness) of the recording medium. By detecting medium thickness and adjusting the gap parameter accordingly, the system compensates for speed differences between transport mechanisms and maintains consistent image placement
2Productivity
If the transfer belt runs at different speed than the paper transporting mechanism, then continuous printing can be performed, but the interpage gap is not always constant causing color shift
Solution Approach 1:
The system uses a thickness detection section to detect the recording medium parameters and provides feedback to the controller. Based on this feedback, the controller adjusts the interpage gap to compensate for speed differences between the paper transport mechanism and transfer belt, maintaining constant positioning throughout continuous printing operations
3Productivity
If the interpage gap is reduced for faster printing, then productivity increases, but positional errors occur with thick rigid media
Solution Approach 1:
The controller dynamically changes the interpage gap parameter based on the detected thickness of the recording medium. For thick media, a larger gap is maintained to prevent positional errors, while for thin media, the gap can be reduced to increase printing speed, thus optimizing both productivity and precision based on medium properties
Data Source
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AI summary
A controller controls transportation of the recording medium such that a first distance (LD) between a trailing edge of an image area of a preceding page of the two successive pages and a leading edge of an image area of a following page is equal to or longer than a second distance (Lall) between the nip at a most upstream one of the image forming sections and the nip at a most downstream one of the image forming sections. Control may also be performed such that a first distance between a trailing edge of a preceding page of the two successive pages and a leading edge of a following page is equal to or longer than a second distance between the nip at a most upstream one of the plurality of image forming sections and the nip at a most downstream one of the plurality of image forming sections.