Fixing Unit Life Estimation Using Torque and Temperature Feedback
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Solution Overview
Problem
Existing image forming apparatuses have inaccuracies in estimating the life of fixing units, particularly when operated under varying temperature conditions, leading to premature failure and image defects.
Innovation Solution
The image forming apparatus utilizes a control unit to acquire life information of the fixing unit based on driving current and operation state, including temperature and torque, to predict the remaining life accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fixing unit is operated under varying temperature conditions, then the adaptability to different operating environments is improved, but the measurement precision of the life estimation deteriorates
Solution Approach 1:
The patent applies parameter changes by incorporating temperature as a variable parameter in the life estimation calculation. The control circuitry adjusts the life estimation based on the detected temperature conditions, allowing the system to adapt to varying thermal environments while maintaining estimation accuracy through dynamic parameter adjustment rather than fixed thresholds
Solution Approach 2:
The patent implements feedback by using temperature detection from temperature sensors to continuously adjust the life estimation. The control circuitry receives temperature information and feeds it back into the life calculation algorithm, creating a closed-loop system that adapts to changing thermal conditions and maintains accurate predictions throughout the fixing unit's operational life
2Device complexity
If the life estimation is based only on torque value, then the device complexity is reduced, but the measurement precision of life estimation deteriorates
Solution Approach 1:
The patent merges multiple estimation parameters by combining torque-based life estimation with temperature-based correction factors. The control circuitry integrates data from both the driving unit's torque measurements and temperature sensors to produce a comprehensive life estimation that leverages the strengths of both measurement approaches while maintaining reasonable system complexity
Solution Approach 2:
The control circuitry is designed with multi-functionality to perform both torque-based estimation and temperature-based correction using the same hardware components. This universal approach allows the system to execute multiple estimation functions without adding separate dedicated hardware for each method, thereby maintaining device simplicity while improving accuracy
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 method enhances the accuracy of predicting the fixing unit's life, reducing premature failure and image defects by considering temperature and operational conditions.
Implementation Method 1
driving, by a driver, the fixing member... based on either a driving current or a torque of the driver
Implementation Method 2
the fixing operation is performed by sliding a fluorine-coated sliding member and the fixing member. When the life of the fixing unit approaches end-of-life, the fluorine coat is peeled off, and the torque of the driving unit increases due to friction between the sliding member and the fixing member
Data Source
AI summary
An image forming apparatus includes a processor; and a memory that includes instructions, which when executed, cause the processor to execute forming, by an image former, an image on a recording medium; fixing, by a fixer including a rotatable fixing member, the image onto the recording medium, by causing the recording medium on which the image is formed by the image former to be disposed against the fixing member; driving, by a driver, the fixing member; and acquiring, by control circuitry, life information related to a life of the fixer based on either a driving current or a torque of the driver and an operation state of the fixer, and outputting the acquired life information.