Fuser Heater Control via Line Voltage Detection
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Solution Overview
Problem
Variations in AC line voltage and power quality affect the operation of electrophotographic printing devices, leading to issues such as fuser heater power fluctuations, inaccurate prediction of fuser ready time, and difficulty in maintaining suitable fusing temperatures, resulting in disruptions and poor print quality.
Innovation Solution
A method for controlling the fuser heater in an electrophotographic device involves determining the initial temperature, calculating warm-up times based on stored data for various line voltages, selecting appropriate warm-up times, and calculating the current line voltage to accurately manage fuser assembly operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fuser heater power is increased to maintain fusing temperature, then fusing temperature stability is improved, but risk of heater cracking and media wrapping increases
Solution Approach 1:
The system dynamically changes the fuser heater power parameter based on detected line voltage conditions. When line voltage is high, the controller reduces heater power to prevent overheating and cracking; when line voltage is low, the controller increases heater power to maintain adequate fusing temperature. This adaptive parameter adjustment resolves the contradiction between temperature stability and heater reliability.
2Reliability
If fuser heater power is decreased to prevent overheating, then heater reliability is improved, but fusing temperature adequacy deteriorates
Solution Approach 1:
The controller adjusts the heater power parameter in response to line voltage detection. When high line voltage is detected, power is reduced to prevent cracking; when low line voltage is detected, power is increased to ensure adequate fusing temperature is achieved. This dynamic parameter change ensures both heater reliability and temperature adequacy are maintained under varying power conditions.
3Device complexity
If line voltage is not monitored, then device complexity is reduced, but fusing temperature control precision deteriorates
Solution Approach 1:
The system implements a feedback mechanism by monitoring line voltage and using this information to adjust heater power accordingly. The controller continuously detects voltage conditions and modifies heating parameters to maintain precise fusing temperature control. This feedback loop resolves the contradiction by accepting the added complexity of voltage monitoring in exchange for significantly improved temperature control precision.
4Speed
If fuser ready time prediction is made without voltage consideration, then operation speed is maintained, but prediction accuracy deteriorates
Solution Approach 1:
The system changes the prediction parameters by incorporating line voltage detection into the fuser ready time calculation. Based on the detected voltage level and its effect on heater warm-up rate, the controller adjusts the predicted ready time accordingly. This parameter adjustment maintains accurate prediction while preserving print operation speed, resolving the contradiction between speed and prediction 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 approach effectively stabilizes fuser heater power, improves temperature control, and enhances the prediction of fuser ready time, reducing disruptions and ensuring consistent print quality by accurately calculating the current line voltage based on actual and calculated warm-up times.
Implementation Method 1
fuser heater power changes dramatically with AC line voltage variation
Implementation Method 2
variation in the operation of the thermistor which is secured to the fuser heater and the connection between the thermistor and the fuser heater
Data Source
AI summary
A system and method for controlling the fuser heater of an electrophotographic imaging device, including determining an initial temperature of the fuser heater; calculating a plurality of warm-up times for heating the fuser heater to a first predetermined temperature based on the initial temperature and a plurality of previously determined warm-up times taken over a plurality of line voltages and stored in memory of the electrophotographic device; determining an actual warm-up time for heating the fuser to the first predetermined temperature; selecting a first calculated warm-up time and a second calculated warm-up time from the plurality of calculated warm-up times; determining a first line voltage value and a second line voltage value corresponding to the first and second warm-up times, respectively, and calculating a current line voltage based on the actual warm-up time, the first and second calculated warm-up times, and the first and second line voltage values.