Fuser Nip Width Estimation Through Temperature-Based Control
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Solution Overview
Problem
The variability in nip width due to factors such as hardness of the pressing roller and mechanism variations affects fusing performance, leading to potential fusing failures or deteriorated quality, and increased energy consumption.
Innovation Solution
An image forming apparatus with a rotatable heating and pressing portion, temperature detectors, and a controller that determines nip width magnitude based on temperature variation and heat generation, adjusting the target temperature accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the nip width is not controlled accurately, then the fusing performance deteriorates (fusing failures and quality issues), but adding complex measurement mechanisms increases device complexity
Solution Approach 1:
The pressing roller itself serves as the measurement tool by utilizing its existing temperature sensor to detect temperature variations that indicate nip width changes. The system self-diagnoses nip width magnitude by analyzing temperature differences between the pressing roller and heating portion, eliminating the need for separate measurement devices.
Solution Approach 2:
The system monitors changes in temperature parameters of the pressing roller and heating portion to infer nip width variations. By tracking temperature differences and rates of change, the system detects nip width magnitude without direct mechanical measurement, converting a mechanical parameter problem into a thermal parameter analysis.
2Manufacturing precision
If the target temperature is not adjusted for nip width variations, then fusing quality becomes inconsistent, but implementing adjustment mechanisms increases control complexity
Solution Approach 1:
The system establishes a feedback loop where temperature sensor data from the pressing roller and heating portion continuously monitors nip width conditions. Based on this feedback, the controller dynamically adjusts the target temperature to compensate for nip width variations, maintaining consistent fusing quality through automated closed-loop control.
Solution Approach 2:
The target temperature is made dynamic rather than fixed, allowing it to change in response to detected nip width conditions. The controller adapts the heating parameters in real-time based on temperature variations, enabling the system to respond flexibly to changing mechanical conditions without manual intervention.
3Reliability
If the heating portion operates at high temperature continuously, then fusing quality is maintained, but energy consumption increases
Solution Approach 1:
Instead of continuous high-temperature operation, the system uses periodic heating cycles where the heating portion is activated only when needed to maintain target temperature. The controller monitors temperature continuously and applies heat intermittently to compensate for thermal losses, reducing overall energy consumption while maintaining fusing quality.
Solution Approach 2:
The system dynamically adjusts heating parameters including target temperature and heating power based on detected nip width conditions and current temperature measurements. By optimizing these parameters in real-time, the system maintains adequate fusing temperature only when necessary, avoiding excessive energy consumption during periods when thermal conditions are already sufficient.
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 approach allows for accurate estimation and control of the fusing temperature, maintaining fusing quality and reducing energy consumption by adapting to nip width changes over time.
Implementation Method 1
a rotatable heating portion (24) including a heating source (36)
Implementation Method 2
a temperature detector (38) that detects a temperature of the heating portion (24) or a temperature of the heating portion (24) and the pressing roller (32)
Implementation Method 3
heat is transmitted to a nip portion by the rotation of the heating roller
Data Source
AI summary
An image forming apparatus includes: a heating portion including a heating source; a pressing portion that presses the heating portion while in contact with it; a temperature detector that detects the temperature of the heating portion and/or the pressing portion; and a conveyer that guides a print sheet with a toner image through a nip portion where the heating portion and the pressing portion are in contact with each other; and a controller that controls the heat source and the conveyer. The controller controls the heating source to set the heating portion to target temperature during execution of a print job, determines a nip width magnitude, on the basis of the temperature variation of the heating portion and/or the pressing portion and heat generation of the heating source by rotating them when the print job is not being executed, and changes the target temperature on the basis of the determination.