Fuser Assembly Thermal Management via Backup Roll Rotation
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Solution Overview
Problem
Laser printing devices face challenges in achieving short first print times while maintaining energy efficiency, as existing methods require significant time to heat the fuser assembly to fusion temperatures, leading to increased energy consumption.
Innovation Solution
A controller is used to activate the heat transfer member and slowly rotate the backup roll during standby periods, maintaining thermal energy by heating the fuser assembly to a lower temperature and slowing rotating the backup roll, allowing for quick temperature reach during fusing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the fuser assembly is heated to fusing temperatures continuously, then the first print time is reduced, but the energy consumption increases significantly
Solution Approach 1:
The backup roll is rotated at a slow speed during standby periods to pre-heat and store thermal energy in the fuser assembly. This preliminary action ensures that when a print job arrives, the fuser assembly is already at or near the required temperature, eliminating the need for full heating cycles and thus reducing first print time without proportionally increasing energy consumption.
Solution Approach 2:
The system dynamically adjusts the backup roll rotation speed based on operational state. During standby, the backup roll rotates slowly to maintain thermal energy with minimal energy input. During active printing, the backup roll rotates at full speed to provide adequate pressure and heat transfer. This dynamic adjustment optimizes the balance between first print time and energy consumption.
2Speed
If the backup roll rotates at high speed during standby, then the fuser assembly reaches temperature faster, but the thermal energy storage is insufficient
Solution Approach 1:
The system performs preliminary heating action by rotating the backup roll at slow speed during standby periods. This slow rotation allows the heat transfer member to be heated continuously without excessive heat loss, accumulating sufficient thermal energy in the fuser assembly before a print job begins, thus ensuring both fast temperature reach and adequate energy storage.
Solution Approach 2:
The system changes the rotation speed parameter of the backup roll based on operational requirements. During standby, slow rotation (low speed parameter) is used to maximize thermal energy accumulation. During printing, high rotation speed is used to ensure adequate heat transfer. This parameter change optimizes both thermal energy storage and temperature reach speed.
3Use of energy by moving object
If the heat transfer member is heated without slow rotation of backup roll, then energy efficiency is improved, but the fuser assembly cannot maintain sufficient thermal energy
Solution Approach 1:
The backup roll is rotated at slow speed during standby as a preliminary action to distribute and store thermal energy uniformly throughout the fuser assembly. This ensures that when heating begins for a print job, thermal energy is already distributed, maintaining energy efficiency while ensuring sufficient thermal energy availability.
Solution Approach 2:
The slow rotation of the backup roll during standby maintains continuous thermal contact between the heat transfer member and the backup roll, ensuring continuous thermal energy transfer and storage. This continuous action prevents thermal energy loss and maintains energy efficiency while building up sufficient thermal energy reserves.
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 first print time and maintains energy efficiency by storing thermal energy in the fuser assembly, enabling rapid temperature attainment without substantial increases in overall energy usage.
Implementation Method 1
maintaining thermal energy by heating the fuser assembly
Implementation Method 2
activates the heat transfer member while controlling the backup roll to rotate
Implementation Method 3
backup roll positioned to engage the heat transfer member thereby defining a fusing nip therewith
Data Source
AI summary
A method and apparatus for providing a relatively short period of time for a fuser assembly to be ready to perform a fusing operation. Included is a fusing assembly having a heat transfer member and a backup member positioned to engage the heat transfer member so as to define a fusing nip therewith; and a controller coupled to the fuser assembly, wherein during a period of time when the fuser assembly is not performing a fusing operation, the controller causes the backup member to rotate at one or more relatively slow speeds relative to a fusing speed of the fuser assembly while activating the heat transfer member. At least one of a beginning and an ending of the period of time being based upon an actual temperature in the fuser assembly.