Fixing Device Upstream Heat Distribution for Uniform Temperature
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Solution Overview
Problem
Existing fixing devices face challenges in maintaining uniform temperature distribution along a heating belt, leading to significant temperature differences between the upstream and downstream sides, which affects heating efficiency and can cause thermal damage to the ceramic heater.
Innovation Solution
A fixing device with a planar heat-generating section where the heat-generating portion on the upstream side has a larger heat generation amount than the downstream side, with the heat generation ratio between the two portions adjusted to minimize temperature differences, ensuring uniform temperature distribution and preventing thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a plurality of heat-generating portions are provided with the same heat generation amount in the movement direction of the belt, then the heating structure is simple and easy to manufacture, but the temperature distribution along the belt becomes non-uniform with significant temperature differences between upstream and downstream sides
Solution Approach 1:
The patent applies local quality by making different portions of the heating element have different heat generation amounts. Specifically, the upstream heat-generating portion is designed to generate more heat than the downstream portion, creating a non-uniform heat distribution that compensates for heat loss along the belt movement direction. This resolves the contradiction by achieving uniform temperature distribution through localized variation in heat generation characteristics.
Solution Approach 2:
The patent employs asymmetry by designing the heat-generating portions with unequal heat generation amounts. The upstream portion generates higher heat while the downstream portion generates lower heat, creating an asymmetric heat distribution pattern. This asymmetric design counteracts the natural heat loss from upstream to downstream, achieving uniform temperature along the belt while maintaining a relatively simple overall structure.
2Productivity
If the heat generation amount is increased to improve heating efficiency, then the heating performance improves, but thermal damage to the ceramic heater increases
Solution Approach 1:
The patent applies local quality by distributing heat generation differently across various portions of the heating element. The upstream portion generates higher heat to compensate for initial heat loss, while downstream portions generate progressively less heat. This localized heat distribution achieves the required heating efficiency without concentrating excessive heat in any single location, thereby preventing thermal damage to the ceramic heater.
Solution Approach 2:
The patent employs parameter changes by varying the heat generation amount across different portions of the heating element. By adjusting the heat generation parameter from upstream to downstream, the system achieves optimal heating efficiency while maintaining temperatures within safe operating limits for the ceramic material, thus preventing thermal damage.
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 solution achieves a significantly reduced temperature difference along the heating belt, enhancing heating efficiency and preventing thermal damage to the ceramic heater, even at high productivity rates and with larger basis weight papers.
Implementation Method 1
a planar heat-generating section that is in contact with the belt and in which, among a plurality of heat-generating portions provided in a movement direction of the belt, a heat-generating portion on an upstream side in the movement direction of the belt has a larger heat generation amount than a heat-generating portion on a downstream side
Data Source
AI summary
A fixing device includes a movable belt; and a planar heat-generating section that is in contact with the belt and in which, among plural heat-generating portions provided in a movement direction of the belt, a heat-generating portion on an upstream side in the movement direction of the belt has a larger heat generation amount than a heat-generating portion on a downstream side.