Belt Driven Roller Positioning for Image Quality Stability
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Solution Overview
Problem
Existing image forming apparatuses face challenges in ensuring the positional accuracy of the belt relative to the body frame, which affects the stability of image quality and leads to color shifts.
Innovation Solution
The image forming apparatus includes a belt unit with a belt driving roller and a belt driven roller, where the belt driven roller is directly positioned relative to the apparatus body, reducing distortion and increasing positional accuracy in the width direction, and is independently positioned in the axial direction to enhance the alignment of transfer rollers and photosensitive drums.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the belt is positioned in the width direction relative to the body frame via many components (belt driven roller, belt frame, belt driving roller), then the structure is more complex and easier to manufacture, but positional accuracy in the width direction deteriorates
Solution Approach 1:
The patent extracts the positioning function from the complex chain of components (belt frame, belt driven roller, belt driving roller) and concentrates it directly on the belt driven roller. The belt driven roller is made to contact the body frame directly at two points, eliminating the need for intermediate positioning elements and achieving direct positioning of the belt in the width direction.
Solution Approach 2:
The positioning is segmented into two independent directional controls: width direction positioning is handled by the belt driven roller contacting the body frame, while axial direction positioning is handled by the belt driving roller contacting the body frame. This segmentation allows each component to specialize in one dimensional positioning, improving overall accuracy.
2Manufacturing precision
If the belt driven roller and belt driving roller are positioned in the axial direction relative to the apparatus body, then the axial positioning is improved, but distortion in the belt frame increases due to dimensional tolerance
Solution Approach 1:
The patent segments the positioning functions by having the belt driven roller handle width direction positioning and the belt driving roller handle axial direction positioning. This separation prevents the accumulation of dimensional tolerances in the belt frame, as each roller independently contacts the body frame in its respective direction without transmitting distortion through the belt frame structure.
Data Source
AI summary
A belt driven roller having a belt guide that positions a conveying belt in a width direction is supported in an axial direction relative to a belt frame, and positioned in the axial direction relative to a body casing. This can increases positional accuracy of the conveying belt relative to the body casing in the width direction. The belt driven roller is displaceable in the axial direction relative to the belt frame, and even if the belt driven roller and a belt driving roller are positioned in the axial direction relative to the body casing, dimensional tolerance between the belt driven roller and the belt driving roller reduces or eliminates distortion in the belt frame. This can increase positional accuracy of transfer rollers and results in a more stable image quality.