Fixing Device Pressing Pad Dynamics for Image Stability
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Solution Overview
Problem
Conventional fixing devices in image forming apparatuses face issues with the pressing pad inclining, vibrating, or wobbling, leading to distortion, shift, or irregularity in images due to frictional resistance, which affects the stability of the pressing mechanism and lowers image quality.
Innovation Solution
A fixing device with a freely rotatable supporting shaft for the pressing member, an urging member to maintain the pressing member's position, and a heating member to stabilize the pressing force, preventing the pressing pad from inclining or wobbling and ensuring consistent pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressing pad is pressed against the fixing roller through the pressing belt, then the toner image can be fixed to the sheet, but the pressing pad may incline, vibrate, or wobble due to frictional resistance, causing image distortion and lowering image quality
Solution Approach 1:
The pressing pad is designed to be freely movable in the axial direction of the fixing roller, allowing it to dynamically adjust its position. This dynamic capability enables the pressing pad to self-align and maintain stable contact with the fixing roller surface, preventing inclination, vibration, and wobble that would otherwise occur with a fixed pressing mechanism, thereby improving both reliability and image quality
Solution Approach 2:
The pressing pad utilizes its own weight and the elastic restoring force of the pressing belt to automatically maintain stable contact with the fixing roller. The system is self-regulating, where the pressing pad naturally adjusts its position to eliminate frictional resistance issues without requiring external control mechanisms, thus preventing image distortion and maintaining high image quality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for stable pressing of the pressing member against the heating member, preventing image distortion and shift, and improving overall image quality by maintaining uniform pressure and reducing frictional issues.
Implementation Method 1
an urging member for urging the supporting member in a specific rotational direction and urging the pressing member against the heating member
Implementation Method 2
a heating member for heating a recording medium having a developer image
Data Source
AI summary
A fixing device includes a heating member for heating a recording medium having a developer image; a pressing member for pressing the recording medium against the heating member; a supporting member for supporting the pressing member; a supporting shaft for supporting the supporting member to be freely rotatable; and an urging member for urging the supporting member in a specific rotational direction and urging the pressing member against the heating member.