Process Cartridge with Differential Speed Developer Carrier
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Solution Overview
Problem
The contact charging method in image forming apparatuses leads to image defects due to corona product adhesion on photoreceptor drums, as existing solutions either increase apparatus size and cost or require dedicated cleaning time, especially in cleaner-less configurations.
Innovation Solution
A process cartridge with a developer carrier having a conductive and dielectric portion, where the developer carrier and image carrier are rotationally driven with different linear velocities, allowing the developer carrier to collect remaining toner and expose the dielectric portion to scrape off corona products, thereby reducing adhesion and image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a heater or fan is provided to control temperature and humidity on the photoreceptor drum surface, then corona product adhesion is reduced, but apparatus size and cost increase
Solution Approach 1:
The photoreceptor drum itself performs the cleaning function by utilizing its own idle rotation to scrape off corona products through contact with the developer carrier, eliminating the need for external heating or ventilation systems
Solution Approach 2:
The developer carrier serves dual functions: it carries developer for image formation and simultaneously acts as a cleaning surface for removing corona products from the photoreceptor drum
2Object-affected harmful factors
If a corona-product removing member is brought into contact with the photoreceptor drum, then corona products are removed, but apparatus size and cost increase
Solution Approach 1:
The developer carrier is designed to serve both as a developer transport mechanism and as a cleaning member that removes corona products through its contact with the photoreceptor drum surface
Solution Approach 2:
The cleaning function is merged with the existing developer carrier structure, combining two functions (developer transport and corona product removal) into a single component
3Object-affected harmful factors
If a cleaning member is provided on the photoreceptor drum for idle rotation cleaning, then corona products are removed, but dedicated cleaning time is required increasing downtime
Solution Approach 1:
The cleaning action occurs continuously during normal operation when the photoreceptor drum rotates idle between image formation cycles, eliminating the need for separate dedicated cleaning time
Solution Approach 2:
The photoreceptor drum performs cleaning action during idle rotation periods before the next image formation cycle begins, preparing the surface in advance for the next printing operation
4Productivity
If the developer carrier and image carrier are rotationally driven with different linear velocities, then remaining developer is effectively collected, but mechanical complexity increases
Solution Approach 1:
The system utilizes dynamic speed variation between the developer carrier and image carrier, where the developer carrier rotates faster to create relative motion that scrapes remaining developer onto the image carrier surface
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 configuration minimizes downtime and effectively reduces corona product adhesion on the image carrier without the need for a separate cleaning member, enhancing image quality and reducing maintenance costs.
Implementation Method 1
The developer carrier and the image carrier are rotationally driven such that a surface of the developer carrier at a contact portion contacting the image carrier and a surface of the image carrier at the contact portion move at linear velocities different from each other
Implementation Method 2
The developer remaining on the image carrier after the developer image is transferred from the image carrier, is collected by the developer carrier at the contact portion
Data Source
AI summary
A process cartridge includes a developer carrier including a dielectric portion and a conductive portion on a surface thereof, a regulation member, and an image carrier disposed so as to come into contact with the developer carrier. The developer carrier and the image carrier are rotationally driven such that a surface of the developer carrier and a surface of the image carrier move at linear velocities different from each other at a contact portion, and the developer remaining on the image carrier after the developer image is transferred from the image carrier, is collected by the developer carrier at the contact portion.