Image Forming Apparatus Sheet Interval Control for Gloss Uniformity
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Solution Overview
Problem
Image forming apparatuses face challenges in maintaining consistent print quality due to varying heat application across pages during multi-page printing, leading to uneven gloss and finished product quality, as existing methods adjust fixing temperatures based on single jobs with different recording materials and printing ratios.
Innovation Solution
An image forming apparatus that controls the sheet interval between recording materials based on the type of recording material and printing ratio, without changing the image forming conditions, using a control unit to adjust the distance between sheets to optimize throughput and maintain consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fixing temperature is changed during printing based on a single job including a plurality of pages, then the throughput is improved, but the gloss uniformity deteriorates
Solution Approach 1:
The patent segments the printing job into individual page units, controlling the sheet interval for each page separately. By managing each page's timing and spacing independently through the sheet interval control unit, the system can optimize throughput for each page while maintaining consistent fixing conditions, thus preventing gloss variation caused by temperature changes during multi-page printing.
2Manufacturing precision
If the sheet interval is controlled based on recording material kind, then the image quality consistency is improved, but the device complexity increases
Solution Approach 1:
The control unit receives information about the recording material kind and uses this feedback to automatically adjust the sheet interval. This feedback mechanism enables the system to adapt to different material types (maintaining image quality consistency) while keeping the control logic integrated and manageable, avoiding excessive complexity through intelligent automation rather than manual intervention.
Solution Approach 2:
The system changes the sheet interval parameter based on the recording material kind. By dynamically adjusting this single critical parameter (sheet interval) according to material properties, the system achieves image quality consistency without requiring complex changes to the entire device architecture, thus resolving the contradiction between precision and complexity.
Data Source
AI summary
A sheet interval, serving as the distance between conveyed recording materials, is properly controlled based on a kind of a recording material and any one of a printing ratio, an adhesion amount of toner, and the presence or absence of graphic data, thus allowing printing at throughput suitable for, for example, the kind of the recording material and the printing ratio without changing an image forming condition such that image quality does not vary.