Electrostatic Web Cleaning Member for Unfused Toner Removal
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Solution Overview
Problem
Existing printing systems face challenges in effectively cleaning printed media without damaging the image, as conventional methods like radiant fusing may leave unfused toner on the media, which can contaminate finishing equipment, and stationary brushes require frequent cleaning to prevent toner smearing, disrupting print production.
Innovation Solution
A conductive electrostatic cleaning member is used to attract or repel unfused toner particles by establishing an electric field between the cleaning member and a backing member, allowing for efficient cleaning of printed media without damaging the image and minimizing system component contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stationary mechanical brushes are used to clean media, then cleaning effectiveness is improved, but the brushes quickly become contaminated with toner requiring shutdown for cleaning
Solution Approach 1:
The patent replaces the purely mechanical stationary brush system with an electrostatic cleaning member that uses electrical fields to attract and remove toner particles. This substitution allows the cleaning member to be easily cleaned by reversing polarity or applying voltage pulses, eliminating the need for mechanical disassembly and extensive cleaning maintenance, thus maintaining productivity while ensuring reliable cleaning effectiveness
Solution Approach 2:
The cleaning member is made rotatable rather than stationary, allowing it to be periodically removed, cleaned, and reinstalled. This dynamic approach enables maintenance without complete system shutdown, balancing cleaning effectiveness with continuous production requirements
2Reliability
If stationary brushes are used to clean printed media, then media cleaning is achieved, but the brushes smear toner on prints when contaminated
Solution Approach 1:
The patent replaces mechanical brushes with an electrostatic cleaning member that uses electrical attraction and repulsion forces to remove toner. This eliminates the mechanical contact that causes smearing, as the electrostatic field can lift and remove toner particles without the friction and pressure that damage printed surfaces
Solution Approach 2:
The cleaning member's electrical parameters (voltage polarity, field strength) can be dynamically adjusted to optimize cleaning effectiveness while preventing toner smearing. By controlling the electrical field parameters, the system achieves reliable cleaning without the harmful mechanical effects that cause toner damage
3Reliability
If flash radiant fusing is used to fix toner images, then high mass toner images are fixed to media, but low density scattered background toner remains unfused and transfers to finishing equipment
Solution Approach 1:
The patent extracts and removes the unfused toner particles from the media surface using an electrostatic field before the media reaches finishing equipment. The cleaning member creates an electrical field that attracts and captures loose toner particles, preventing them from transferring to finishing equipment while leaving the firmly bonded printed image intact
Solution Approach 2:
The cleaning operation is performed immediately after printing and before finishing operations. This preliminary cleaning action removes unfused toner particles before they can contaminate finishing equipment, solving the problem of toner transfer while maintaining the fixation quality of the printed image
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 conductive electrostatic cleaning member improves print quality by effectively removing unfused toner particles, reduces contamination of system components, and extends service intervals by using an electric field to attract or repel toner, enhancing cleaning performance over traditional methods.
Implementation Method 1
a conductive electrostatic cleaning member that attracts or repels, e.g., unfused toner particles
Implementation Method 2
electrically biasing one of a conductive cleaning member and a backing member, each of which are arranged on opposite sides of a media channel, thereby establishing an electric field
Implementation Method 3
retaining the electrostatically charged toner particles on an electrically biased cleaning member
Data Source
AI summary
A web cleaning system includes one or more conductive electrostatic cleaning members that may be grounded or electrically biased, and form an electric field. The conductive cleaning member opposes a conductive backing member that may be grounded or electrically biased. The conductive cleaning member contacts the web as it translates through the cleaning system, and charged debris on the web is affected by the electric field formed by the cleaning member.