Resistive Heating Fuser Roll for Rapid Warm-Up
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Solution Overview
Problem
Current hot roll fusers in color laser printers take a long time to heat up and are inefficient in energy consumption, while belt fusers are complex and costly with a short lifespan.
Innovation Solution
A resistance-heated fuser roll with a non-metallic core, such as quartz or ceramic, featuring a resistive heating element and insulation and toner release layers, which reduces warm-up time and improves fusing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a lamp-heated hot roll fuser is used, then fusing quality is improved, but warm-up time increases and energy consumption increases
Solution Approach 1:
The patent replaces the external lamp heating system with an internal resistive heating element embedded in the fuser roll. This substitution of heating mechanism enables rapid heating directly at the fusing surface, achieving belt-fuser-speed warm-up (under 15 seconds) while maintaining hot roll fusing quality, thus resolving the contradiction between fusing quality and warm-up time.
Solution Approach 2:
The patent changes the heating parameter from external radiant heating to internal resistive heating, and modifies the roll structure to be hollow for faster thermal response. This parameter change enables the hot roll fuser to heat up rapidly like a belt fuser while maintaining the superior fusing quality characteristic of hot roll fusers.
2Manufacturing precision
If a lamp-heated hot roll fuser is used, then fusing quality is improved, but energy consumption increases
Solution Approach 1:
The patent replaces the continuous lamp heating system with an internal resistive heating element that can be precisely controlled. This substitution allows energy to be applied only when needed and at the exact location where heating is required, significantly reducing energy consumption while maintaining fusing quality.
Solution Approach 2:
The fuser roll generates its own heat through the embedded resistive heating element, eliminating the need for external lamp heating. This self-heating capability reduces energy consumption by directing power directly to the fusing surface without the energy losses associated with external radiant heating.
3Loss of time
If a belt fuser is used, then warm-up time is reduced, but device complexity and cost increase
Solution Approach 1:
The patent merges the heating element directly into the fuser roll structure, combining the functions of the heating system and the fusing roll into a single integrated component. This merger simplifies the overall design by eliminating the separate lamp housing, reflectors, and control systems required by belt fusers, while achieving rapid warm-up performance.
Solution Approach 2:
The fuser roll serves multiple functions: it acts as the structural support, the thermal mass for consistent fusing, and the mounting platform for the resistive heating element. This multi-functionality reduces the number of separate components needed, simplifying the design compared to belt fusers while achieving rapid warm-up.
4Loss of time
If a belt fuser is used, then warm-up time is reduced, but manufacturing cost increases
Solution Approach 1:
The patent uses a cost-effective approach by embedding a simple resistive heating element in a hollow fuser roll, avoiding the expensive steel-rubber belt and complex mechanical components of belt fusers. This design achieves rapid warm-up at a lower manufacturing cost, making it economically viable for color laser printers.
Solution Approach 2:
The patent replaces the complex mechanical belt system with a simpler hollow roll structure containing an embedded heating element. This substitution reduces manufacturing complexity and cost while achieving the rapid warm-up performance characteristic of belt fusers, making the solution more cost-effective for production.
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 achieves rapid heating and improved fusing quality comparable to belt fusers while being cost-effective and durable, with a warm-up time comparable to known belt fusers and mechanical strength to sustain required forces.
Implementation Method 1
A resistive heating element is disposed on at least a portion of the outer surface of the core
Implementation Method 2
A layer of insulative material (e.g., silicone rubber or other suitable material) may cover at least a portion of the resistive heating element
Data Source
AI summary
A fuser roll adapted to fuse toner on the surface of a recording medium is disclosed. The fuser roll includes a non-metallic core having an outer surface, and a resistive heating element covering at least a portion of the outer surface of the core. A current transmitter is provided for transmitting a current to said resistive heating element, and an insulation layer is provided for covering at least a portion of said resistive heating element. A toner release layer is provided for covering at least a portion of said insulation layer.