Fixing Device Heating Section Temperature Control via Segmented Urge
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Solution Overview
Problem
In fixing devices with heating films, accurately measuring the temperature of heat-sensitive components like thermistors or thermocuts is challenging due to the need for firm holding mechanisms that ensure precise temperature control and safety features.
Innovation Solution
A fixing device design incorporating a heating rotating body, a heater, a heater holding member, a heat-sensitive body, a cover member, and an urging member, where the urging member intersects with the heater holding member and cover member to securely position the heat-sensitive body near the heater, ensuring precise temperature detection and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a compressed coil spring is used to firmly hold the heat-sensitive body to the heater, then the temperature measurement accuracy is improved, but the device complexity and space requirements increase
Solution Approach 1:
The holding mechanism is divided into multiple urging members (first and second urging members) that are positioned at different locations. Each urging member independently applies pressure to hold the heat-sensitive body against the heater, distributing the holding function across multiple simpler components rather than one complex spring mechanism
Solution Approach 2:
The urging members extend in a direction intersecting with the pressure application direction (e.g., extending in the width direction while applying pressure in the thickness direction). This orthogonal arrangement allows the urging members to engage with both the heater holding member and cover member, providing stable positioning and pressure application without requiring complex coil spring structures
2Measurement precision
If a compressed coil spring is used to firmly hold the heat-sensitive body to the heater, then the temperature measurement accuracy is improved, but the volume of the heating section increases
Solution Approach 1:
The holding mechanism is divided into multiple urging members (first and second urging members) that are positioned at different locations. Each urging member independently applies pressure to hold the heat-sensitive body against the heater, distributing the holding function across multiple simpler components rather than one complex spring mechanism
Solution Approach 2:
The urging members extend in a direction intersecting with the pressure application direction (e.g., extending in the width direction while applying pressure in the thickness direction). This orthogonal arrangement allows the urging members to engage with both the heater holding member and cover member, providing stable positioning and pressure application without requiring complex coil spring structures
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 accurate and precise temperature measurement and control of the heater, enhancing the safety and efficiency of the image forming process by maintaining consistent pressure and reducing the volume of the heating section, thereby improving temperature detection performance.
Implementation Method 1
The heater applies heat to the heating rotating body
Implementation Method 2
The urging member urges the cover member in a first direction which is toward the heater from the heat-sensitive body
Data Source
AI summary
A fixing device includes a heating section. The heating section includes a heater, a heater holding member, a heat-sensitive body, a cover member, and an urging member. The heater holding member holds the heater. The heat-sensitive body faces the heater. The cover member covers the heat-sensitive body. The urging member urges the cover member in a first direction which is toward the heater from the heat-sensitive body. The urging member extends in a second direction intersecting with the first direction and engages with the heater holding member and the cover member.