Transfer Roller Position Regulation for Uniform Print Quality
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Solution Overview
Problem
Image forming apparatuses face challenges in maintaining uniform relative positions between the photosensitive body and the transfer roller, leading to variations in print quality when developing units are replaced, particularly in indirect type transfer units where developer transfer occurs by electrical attraction.
Innovation Solution
The apparatus incorporates position regulating guides and movable guides to ensure the first transfer roller maintains a uniform angle with the intermediate transfer belt, using elastic members and rotational hooks to stabilize the relative position, ensuring consistent contact and print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If developing units are made separable and replaceable, then ease of operation and maintenance are improved, but the relative position between the photosensitive body and transfer roller becomes unstable, leading to variations in print quality
Solution Approach 1:
Position regulating guides are introduced as intermediary components between the developing unit housing and the transfer roller. These guides mediate the interaction between the replaceable developing units and the fixed transfer roller, ensuring that the photosensitive body maintains a consistent angle and position relative to the transfer roller regardless of which developing unit is installed.
Solution Approach 2:
The position regulating guides constrain the positional parameters of the transfer roller, specifically its angle and distance from the photosensitive body. By regulating these geometric parameters through the guide structure, the system ensures uniform relative positioning that maintains print quality across multiple developing unit replacements.
2Manufacturing precision
If the first transfer roller is fixed rigidly, then manufacturing precision and position stability are improved, but adaptability to different developing units and ease of adjustment are reduced
Solution Approach 1:
The transfer roller is designed with movable mounting on the transfer unit frame, allowing it to dynamically adjust its position. The position regulating guides provide constrained movement, enabling the roller to adapt to different developing units while maintaining precise angular and positional relationships through the guide structure.
Data Source
AI summary
An image forming apparatus includes a photosensitive body on which a visible image is developed by developer, an intermediate transfer belt to which developer of the photosensitive body is transferred, and a first transfer roller to transfer the developer from the photosensitive body to the intermediate transfer belt, wherein since a developing unit housing at which the photosensitive body is mounted is provided with position regulating guides to support a shaft of the first transfer roller, the intermediate transfer belt comes into contact with the photosensitive body at a uniform angle. As a result, uniform print quality may be obtained.