Cartridge Positioning and Cleanerless Development System
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Solution Overview
Problem
Conventional image forming apparatuses with process cartridges require complex maintenance procedures and may experience issues with transfer residual developers adhering to charging rollers, affecting image quality and maintenance efficiency.
Innovation Solution
The development cartridge and drum cartridge configurations include a cleanerless system with an optical static-reducing member and a peripheral speed difference between the charging roller and photosensitive drum to prevent transfer residual developers from adhering to the charging roller, and a configuration where the developing roller collects and reuses residual developers, integrating a developing roller gear for synchronized rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional process cartridge system is used, then maintenance can be executed by a user without a service person, but transfer residual developers may adhere to charging rollers, affecting image quality
Solution Approach 1:
The patent converts the harmful effect of transfer residual developers by introducing an optical static-reducing member that reduces the static charge of residual developers, preventing them from adhering to the charging roller. The peripheral speed difference between the charging roller and photosensitive drum also converts the potential harm into benefit by creating a speed differential that prevents adhesion while maintaining the cleanerless system's simplicity for user maintenance
2Object-affected harmful factors
If cleaning members are added to remove transfer residual developers, then image quality improves, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent extracts the cleaning function from the traditional cleaning member configuration and replaces it with a cleanerless system. Instead of adding cleaning members that would increase device complexity, the invention removes the need for cleaning members entirely by using the optical static-reducing member and peripheral speed difference to prevent adhesion at its source
Solution Approach 2:
The system performs self-service by using the optical static-reducing member to automatically reduce static charge and prevent residual developer adhesion without requiring separate cleaning members or complex cleaning mechanisms. The peripheral speed difference between rollers also contributes to this self-service function by naturally preventing adhesion through speed differential
3Loss of substance
If the developing roller collects and reuses residual developers, then material efficiency improves, but the system requires synchronized rotation control
Solution Approach 1:
The patent merges the rotation control of the developing roller with the photosensitive drum by engaging a developing roller gear with the photosensitive drum gear. This integration allows the developing roller to rotate in synchronization with the photosensitive drum, enabling residual developer collection and reuse without requiring separate complex control mechanisms
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 enhances maintenance efficiency by eliminating the need for cleaning members and ensures consistent image quality by effectively managing transfer residual developers, reducing adhesion to the charging roller and utilizing residual developers within the system.
Implementation Method 1
an optical static-reducing member to prevent transfer residual developers from adhering to the charging roller
Implementation Method 2
a peripheral speed difference between the charging roller and photosensitive drum to prevent transfer residual developers from adhering to the charging roller
Implementation Method 3
a configuration where the developing roller collects and reuses residual developers, integrating a developing roller gear for synchronized rotation
Data Source
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AI summary
A development container (16) includes a positioning portion (34b, 46b) and a rotation stop portion (34c, 46c) engaged with and guided by a guide of an image forming apparatus, and a longitudinal positioning portion (34v), at one end in an axial direction of a developer carrying member (13). In a state where a cartridge (B1) is attached to the image forming apparatus, when a cross-sectional positioning range (Sc) is defined by using a width, having one end at a point at which the rotation stop portion contacts the guide and another end at a point at which the positioning portion contacts the guide in an attachment direction of the cartridge, and a height being a width of the guide at one of the points, the longitudinal positioning portion overlaps the cross-sectional positioning range in a longitudinal direction.