Fixing Device Dual-Sensor Temperature Correction for Image Forming
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Solution Overview
Problem
Existing fixing devices in image forming devices face issues with temperature deviations due to sensor abnormalities, leading to potential fixing failures and hot offset, as correction values reach maximum limits without timely updates.
Innovation Solution
A fixing device equipped with both contact and non-contact temperature detectors, where a controller compares and corrects the non-contact detector's readings using a larger absolute value when the correction value exceeds a predetermined maximum, and notifies an external control center of sensor failures via a server, initializing the correction value to prevent further deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the correction value reaches the maximum value and is used until the next correction value measurement, then the system maintains operation continuity, but temperature deviation occurs leading to fixing failure or hot offset
Solution Approach 1:
The system performs preliminary action by initializing the correction value to 0 when it reaches the maximum value, preventing future temperature deviations before they occur. This proactive reset ensures that the non-contact temperature detector starts with an accurate baseline, avoiding fixing failures and hot offset that would result from continued use of maxed-out correction values.
2Measurement precision
If the correction value is continuously updated during warm-up, then temperature detection accuracy is improved, but system complexity increases
Solution Approach 1:
The system applies parameter changes by dynamically adjusting the correction value parameter within a defined range (from -10 to +10). The correction value is updated based on temperature differences detected during warm-up, and automatically initialized to 0 when reaching the maximum value. This parameter-based approach simplifies control logic while maintaining high temperature detection accuracy.
3Measurement precision
If the correction value is initialized to 0 when exceeding maximum value, then temperature deviation is reduced, but correction responsiveness decreases
Solution Approach 1:
The system implements periodic action by continuously monitoring the correction value during warm-up and periodically updating it based on temperature differences. When the correction value reaches the maximum value, it is periodically reset to 0, creating a cyclic correction pattern that maintains accuracy without permanent loss of responsiveness. This periodic initialization ensures the system remains sensitive to temperature changes while preventing cumulative errors.
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 reduces the likelihood of temperature deviations after sensor replacement by ensuring accurate temperature detection and timely correction, thereby minimizing fixing failures and hot offset occurrences.
Implementation Method 1
a contact-type temperature detector that comes into contact with a fixing belt
Implementation Method 2
a non-contact-type temperature detector that does not come into contact with the fixing belt
Data Source
AI summary
A fixing device includes a contact thermistor that comes into contact with a fixing belt and a thermopile that does not come into contact with the fixing belt, and a control microcomputer that compares a detection result of the contact thermistor with a detection result of the thermopile in initial operation under a predetermined condition, and corrects the detection result of the thermopile. The control microcomputer initializes a correction value to be used for correction when the correction value exceeds a maximum value determined in advance.