Fixing Device Temperature Control for Envelope Toner Fixation
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Solution Overview
Problem
Conventional fixing devices face challenges in ensuring sufficient heat quantity for fixing toner images on envelopes, which have varying thickness and lamination configurations, leading to potential unfixed toner issues due to insufficient heat distribution.
Innovation Solution
A fixing device equipped with first and second rotatable members, a heating portion, and temperature sensors to detect and control heat distribution along the rotatable members, allowing for optimized temperature control based on the envelope's width and lamination configuration, ensuring consistent heat application across the nip area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pressure is reduced to prevent envelope creases, then envelope quality is improved, but heat quantity at laminated portions becomes insufficient leading to unfixed toner
Solution Approach 1:
The patent applies different pressure levels to different regions of the envelope by dividing the pressing surface into multiple independent pressing elements. Laminated portions receive higher pressure to ensure toner fixation, while non-laminated portions receive lower pressure to prevent creases. This local differentiation of pressure quality resolves the contradiction between preventing creases and ensuring fixation at laminated areas.
Solution Approach 2:
The pressing elements are designed to independently adjust their pressure application dynamically based on the detected position of laminated portions. The system transitions from static uniform pressure to dynamic adaptive pressure, where each pressing element can vary its force in real-time according to the local envelope structure, thereby resolving the fixation-crease contradiction.
2Reliability
If uniform pressure is applied across the envelope, then toner fixation is improved, but creases occur on non-laminated portions
Solution Approach 1:
The pressing surface is segmented into multiple independent pressing elements that can operate autonomously. This segmentation allows different regions to receive differentiated pressure treatment, with laminated portions receiving higher pressure for fixation and non-laminated portions receiving lower pressure to avoid creases, thereby resolving the uniform pressure contradiction.
Solution Approach 2:
Each pressing element applies pressure locally according to the specific requirements of its corresponding envelope region. Laminated areas receive intensified local pressure for fixation, while non-laminated areas receive reduced local pressure to prevent creasing, achieving local quality optimization that resolves the uniform pressure issue.
3Reliability
If heating is intensified to ensure toner fixation at laminated portions, then fixation reliability is improved, but excessive heat causes glossiness on thin portions
Solution Approach 1:
The heating system is divided into multiple independent heating elements corresponding to different envelope regions. Laminated portions receive intensified local heating to ensure toner fixation, while non-laminated thin portions receive reduced or no heating to prevent excessive glossiness. This local differentiation of heat quality resolves the fixation-glossiness contradiction.
Solution Approach 2:
The heating elements dynamically adjust their temperature output based on real-time detection of envelope structure. The system transitions from static uniform heating to dynamic adaptive heating, where each heating element varies its intensity according to local requirements, thereby resolving the fixation-glossiness issue.
4Measurement precision
If multiple sensors are used to detect temperature at different positions, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The temperature detection system is segmented into multiple sensors positioned at different locations corresponding to different envelope regions. Each sensor independently monitors temperature at its specific position, enabling precise local temperature control. This segmentation achieves high measurement precision while maintaining manageable system complexity through modular sensor placement.
Solution Approach 2:
The multiple temperature sensors serve multiple functions: they detect temperature at different positions, provide feedback for independent heating element control, and enable adaptive adjustment based on envelope structure. This multi-functionality justifies the added sensor complexity by delivering comprehensive temperature management that resolves the fixation-glossiness contradiction.
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 ensures proper fixing of toner images on envelopes by maintaining a consistent temperature across the fixing device, preventing unfixed toner issues and achieving high-quality image fixation without excessive glossiness.
Implementation Method 1
a heating portion for heating the first rotatable member
Implementation Method 2
a first sensor for detecting a temperature of a longitudinally central portion of the first rotatable member, a second sensor for detecting a temperature of one longitudinal end portion of the first rotatable member
Data Source
AI summary
A fixing device includes a first rotatable member and a second rotatable member for forming a nip for fixing a toner image on a recording material, a heating portion for heating the first rotatable member, a first sensor for detecting a temperature of a longitudinally central portion of the first rotatable member, a second sensor for detecting a temperature of one longitudinal end portion of the first rotatable member, and a controller for controlling energization to the heating portion using a detection temperature of the first sensor and a detection temperature of the second sensor in a case that the recording material is an envelope having a predetermined width or more.