Refurbishing Fuser Members via Controlled Heating and Compression
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Solution Overview
Problem
In electrophotographic printers, paper edges can leave wear marks and foreign materials accumulate on the topcoat of fuser and pressure members, leading to undesirable image artifacts, necessitating frequent replacement of these components, which is costly and inefficient.
Innovation Solution
A method for refurbishing cylindrical members with a high-temperature, low-surface-energy semicrystalline thermoplastic topcoat by rotating and heating the members with a heater roller assembly at controlled temperature and pressure to resurface and restore a uniform finish, utilizing a quick-release assembly for easy installation and removal within the printer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuser and pressure members are frequently replaced to avoid image artifacts, then image quality is maintained, but operational costs and downtime increase
Solution Approach 1:
The patent applies the discarding and recovering principle by restoring the functional surface of pressure members through refurbishment rather than discarding them entirely. The process recovers the low surface energy properties of the topcoat by removing contaminants and worn material, allowing the component to be reused multiple times, thus reducing downtime and operational costs while maintaining image quality
Solution Approach 2:
The refurbishment system is integrated into the printer itself, allowing the pressure member to be refurbished in-situ without removing it from the device. The heater roller and scraper assembly work together to automatically restore the surface during scheduled maintenance intervals, enabling the system to service itself and eliminate the need for external refurbishment facilities
2Loss of energy
If fuser and pressure members are replaced less frequently to reduce costs, then operational expenses decrease, but image artifacts increase
Solution Approach 1:
The patent implements periodic action by scheduling refurbishment operations at predetermined intervals based on the service history of the pressure member. The controller monitors usage and automatically initiates refurbishment cycles, applying heat and mechanical scraping to restore the surface before significant wear or contamination occurs, thereby preventing image artifacts while optimizing the replacement/refurbishment frequency to minimize operational expenses
Solution Approach 2:
The system incorporates feedback mechanisms where the controller monitors the service history and surface condition of the pressure member, adjusting the refurbishment timing and intensity accordingly. This feedback loop ensures that refurbishment is performed only when necessary to prevent artifacts, avoiding both premature replacement and excessive wear, thus optimizing the balance between operational expenses and image quality
3Reliability
If the topcoat surface is heated to high temperatures to restore low surface energy, then surface properties are improved, but risk of melting the thermoplastic increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the temperature, pressure, and duration of the heating process during refurbishment. The system adjusts these parameters based on the specific thermoplastic material being used, heating the surface to a temperature sufficient to restore low surface energy properties without exceeding the melting point, thereby improving surface properties while maintaining structural integrity
Solution Approach 2:
The patent uses an intermediary approach by applying heat through a heater roller that contacts the pressure member surface, rather than direct high-temperature exposure. This intermediary heating method allows for controlled thermal transfer, ensuring the thermoplastic topcoat reaches the necessary temperature for surface restoration without localized overheating that could cause melting or structural damage
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
Extends the usable life of fuser and pressure members by removing surface irregularities and preventing gloss variation artifacts, reducing the need for frequent replacements and associated expenses.
Implementation Method 1
engaging the outer surface of the pressure member with at least one heating roller at a pressure of at least 5 psi at a temperature of between 10° C. below the thermoplastic melting temperature and the melting temperature of the thermoplastic
Implementation Method 2
engaging the outer surface of the pressure member with at least one heating roller at a pressure of at least 5 psi
Data Source
AI summary
The present invention provides a method of resurfacing a cylindrical member in a printer having a fuser member that is externally heated by a heater roller. The method includes providing a cylindrical member having an outer surface of a high temperature fluorothermoplastic. When it is determined that the outer surface is in need of resurfacing, the fuser member is removed from the printer, and the cylindrical member is mounted in the place of the fuser member. The cylindrical member is rotated at a speed of at least 1 rpm while engaging the outer surface of the fuser member with the heating roller normally used to heat the fuser member at a pressure of at least 5 psi at a temperature of at least 10° C. below the fluorothermoplastic melting temperature for a time sufficient to resurface of the outer surface of the cylindrical member.