Fixing Device Thermal Insulation Cover Dynamics
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Solution Overview
Problem
Existing fixing devices in image forming apparatuses face issues with heat dissipation and temperature regulation, leading to overheating or underheating of the pressure roller, which affects the fixing process and can result in surface degradation or faulty image formation.
Innovation Solution
A fixing device with a thermal insulation cover positioned opposite the pressure roller, coupled with a mover that maintains a predetermined interval between the cover and the roller, ensuring consistent heat insulation and preventing contact during movement, while a pressurization assembly moves the pressure roller to form and release the fixing nip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a thermal insulation cover is disposed close to the pressure roller to improve heat insulation, then heat insulation effectiveness is improved, but the risk of contact and surface degradation increases when the pressure roller moves
Solution Approach 1:
The thermal insulation cover is configured to move dynamically with the pressure roller through coordinated movement mechanisms. When the pressure roller moves toward the thermal insulation cover, the cover moves accordingly to maintain a predetermined interval, preventing contact while preserving heat insulation effectiveness.
2Stress or pressure
If the pressure roller is pressed against the fixing roller to form a fixing nip, then fixing pressure is improved, but temperature control consistency deteriorates due to heat dissipation variations
Solution Approach 1:
The thermal insulation cover acts as an intermediary between the pressure roller and the external environment. It maintains a predetermined interval from the pressure roller surface, creating a controlled thermal environment that reduces heat dissipation variations and improves temperature control consistency during the fixing process.
3Adaptability or versatility
If the pressure roller moves to release the fixing nip, then operational flexibility is improved, but temperature stability deteriorates due to changing heat insulation conditions
Solution Approach 1:
The thermal insulation cover is coupled with the pressure roller through movement mechanisms that enable coordinated dynamic adjustment. As the pressure roller moves to release the fixing nip, the cover moves accordingly to maintain a predetermined interval, ensuring continuous temperature stability while preserving operational flexibility.
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 maintains effective heat insulation, prevents surface degradation of the pressure roller, and ensures consistent temperature control, thereby improving the fixing process and image quality.
Implementation Method 1
A thermal insulation cover 203 is disposed opposite the pressure roller 22
Implementation Method 2
heated by a heater 23
Implementation Method 3
a pressure roller 22 and a heater 23. The pressure roller 22 is pressed against the fixing belt 21
Data Source
AI summary
A fixing device includes a first rotator and a second rotator pressed against the first rotator to form a fixing nip therebetween, through which a recording medium bearing a toner image is conveyed. A thermal insulation cover is disposed opposite the second rotator. A mover is connected to the second rotator to move the second rotator with respect to the first rotator. The mover is coupled with the thermal insulation cover to move the thermal insulation cover while retaining a predetermined interval between the thermal insulation cover and the second rotator.