Fuser Assembly Fan Control for Backup Roller Overheating
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Solution Overview
Problem
Modern fusers with low thermal mass in electrophotographic printers face challenges with temperature control, including overshoot and droop, which can lead to overheating of the backup roller, especially when handling narrow or mid-width substrates.
Innovation Solution
A cooling apparatus is integrated into the printer, comprising a fuser assembly with a heat transfer member and a backup member, along with a temperature sensor and controller that activates the cooling system when the backup member's temperature exceeds a predefined threshold, using cooling air to regulate the temperature and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a low thermal mass fuser is used, then fast first fuse times and low power usage are achieved, but temperature control becomes difficult with overshoot and droop, and backup roller overheating becomes more likely
Solution Approach 1:
The cooling apparatus is activated preemptively based on predicted heating conditions (number of substrates, substrate width) before the backup roller actually overheats. The controller determines in advance whether cooling is needed and activates the cooling apparatus accordingly, preventing temperature overshoot and backup roller overheating before they occur.
Solution Approach 2:
The system uses temperature sensors to continuously monitor the backup roller temperature and feeds this information back to the controller. The controller adjusts the cooling apparatus operation based on real-time temperature feedback, activating cooling when temperature exceeds thresholds and deactivating when it returns to acceptable ranges, thereby stabilizing temperature control.
2Use of energy by moving object
If a low thermal mass fuser is used, then low power usage is achieved, but backup roller overheating becomes more likely
Solution Approach 1:
The controller calculates the number of substrates to be printed and their widths in advance to predict heating requirements. Based on this preliminary assessment, the controller proactively activates the cooling apparatus before the backup roller temperature becomes excessive, preventing overheating while maintaining the low power consumption benefits of the low thermal mass fuser.
Solution Approach 2:
Temperature sensors continuously monitor the backup roller temperature and provide feedback to the controller. The controller uses this feedback to dynamically control the cooling apparatus, activating it only when necessary to prevent overheating, thereby protecting the backup roller while minimizing additional power consumption.
3Reliability
If cooling air is applied to the fuser assembly, then backup roller temperature is controlled, but additional energy consumption occurs
Solution Approach 1:
The cooling apparatus is activated only partially or intermittently based on actual temperature needs rather than continuously. The controller determines the precise moment when cooling is required and activates the cooling apparatus only for the duration necessary to bring the backup roller temperature back within acceptable ranges, thereby minimizing energy consumption while ensuring reliable temperature control.
Solution Approach 2:
The system uses temperature feedback from sensors to control the cooling apparatus. When the backup roller temperature exceeds predetermined thresholds, the cooling apparatus is activated; when the temperature returns to acceptable ranges, the cooling apparatus is deactivated. This feedback-based control ensures cooling is applied only when necessary, optimizing the balance between reliability and energy consumption.
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 effectively manages temperature fluctuations, preventing overheating and maximizing printer throughput by actively cooling the fuser assembly, thus ensuring reliable operation and extending the lifespan of components.
Implementation Method 1
a cooling apparatus adapted to move cooling air capable of cooling the fuser assembly
Implementation Method 2
a temperature sensor associated with a first portion of the backup member for sensing the temperature of the backup member
Data Source
AI summary
A printer is provided including a reference edge, a fuser assembly, a cooling apparatus and a controller. The reference edge is adapted to be contacted by a substrate as the substrate moves along a substrate path through the printer. The fuser assembly includes a heat transfer member including a belt and a backup member. The cooling apparatus is adapted to move cooling air capable of cooling the fuser assembly. The controller is configured to activate the cooling apparatus after determining that a first end portion of the backup member opposite a second end portion of the backup member near the reference edge is at a temperature above a predefined first threshold temperature.