Heating Roller Axial Restriction in Fixing Devices
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Solution Overview
Problem
Existing fixing devices in image forming apparatuses face challenges in maintaining the axial position of heating rollers during rotation, leading to potential displacement and contact issues with lead wires and gears, which can cause instability and damage.
Innovation Solution
Incorporating cover parts with restriction parts that project to restrict the axial movement of the heating roller, ensuring it remains in a predetermined position even if fixing members detach, thereby reducing displacement and contact with lead wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixing members are used to secure the heating roller, then the heating roller can be held in position, but if the fixing members detach, the heating roller may displace and contact lead wires or gears causing instability and damage
Solution Approach 1:
The restriction part protruding from the cover part acts as a preventive measure that limits the axial movement of the heating roller before it can reach positions where it would contact lead wires or gears. This cushioning restriction prevents the harmful contact even if fixing members detach, thereby resolving the contradiction between position stability and damage risk.
2Ease of manufacture
If the heating roller is allowed to move axially for assembly purposes, then assembly is easier, but the heating roller may not remain in a predetermined position during operation
Solution Approach 1:
The restriction part is designed to allow axial movement of the heating roller during assembly operations, but automatically engages to restrict movement when the heating roller reaches its operational position. This dynamic behavior enables both easy assembly and precise position control, resolving the contradiction between assembly ease and position precision.
3Reliability
If multiple fixing members are used to secure the heating roller, then position stability improves, but device complexity increases
Solution Approach 1:
The restriction part is integrated into the cover part as a unified structure, combining the functions of the cover and the axial movement restriction mechanism. This merging eliminates the need for separate fixing members while maintaining position stability, thereby resolving the contradiction between reliability and device complexity.
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
The restriction parts effectively prevent large displacements of the heating roller, maintaining stability and reducing the risk of damage to the cover parts and improving the assembly process by ensuring the heating roller remains aligned with the gear and lead wires.
Implementation Method 1
a heating member provided inside the rotary member; supply parts that supply power to the heating member
Data Source
AI summary
A fixing device includes a rotary member, a heating member provided inside the rotary member, supply parts that supply power to the heating member, cover parts that cover the supply parts, and fixing members that fix the rotary member in an axial direction. The cover parts have a restriction part that restricts movement of the rotary member in the axial direction.