Developing Cartridge Electrodes for Thin Design and Sidewall Wear Prevention
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Solution Overview
Problem
Existing developing cartridges are not designed to be thin while maintaining individual electrodes for the developing roller and supply roller, requiring a cover member with a predetermined thickness to accommodate contact point members, which limits design flexibility.
Innovation Solution
The developing cartridge features a housing with a developing electrode and a supply electrode that protrude in parallel directions relative to their respective shafts, allowing for thin design without scraping the cartridge's sidewalls, and includes contact point members that connect to these protrusions to provide power, enhancing layout freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual electrodes are provided to the developing roller and supply roller with contact point members extending away from the rollers, then image quality is improved through individual bias control, but the cover member thickness increases reducing design flexibility
Solution Approach 1:
The contact point members are repositioned from an extended configuration away from the rollers to a configuration where they contact the rollers at or near their axial positions. This dimensional repositioning allows the electrodes to be individually controlled while minimizing the cover member thickness requirement, thus resolving the contradiction between image quality and compact design.
Solution Approach 2:
Instead of extending the contact point members away from the rollers as in conventional designs, the invention inverts this approach by having the contact point members contact the rollers at their axial positions or nearby. This inversion eliminates the need for thick cover members while maintaining individual electrode control for high-quality image formation.
2Adaptability or versatility
If contact point members are extended away from the developing roller and supply roller, then individual electrode control is achieved, but the leading ends scraping the cartridge sidewalls causes wear
Solution Approach 1:
The harmful scraping action is eliminated by extracting the extended contact point member configuration and replacing it with contact point members that engage the rollers at their axial positions. This removes the source of sidewall wear while preserving the essential function of individual electrode control through separate contact points.
Solution Approach 2:
The invention converts the potential harm of extended contact point members scraping sidewalls into a beneficial configuration where contact occurs at axial positions. This eliminates wear while maintaining the adaptability of individual electrode control, effectively turning a harmful design feature into a beneficial one.
3Reliability
If the cover member has predetermined thickness to accommodate extended contact point members, then electrodes can be individually connected, but layout freedom is reduced
Solution Approach 1:
The contact point members are repositioned from an extended axial configuration to a configuration contacting the rollers at their axial positions. This dimensional change allows electrode connections to be made with minimal cover member thickness, thereby maintaining layout freedom while ensuring reliable electrical connections for individual electrode control.
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 design enables a thin developing cartridge with improved layout flexibility and prevents sidewall wear, ensuring efficient power transfer and maintaining image quality.
Implementation Method 1
toner is supplied to the electrostatic latent image from the developing roller by a potential difference between the developing roller and the photosensitive drum
Data Source
AI summary
A developing cartridge may include a housing configured to hold toner. The cartridge may further include a developing roller including a developing roller shaft, a supply roller including a supply roller shaft, a developing electrode and a supply electrode. The developing electrode and supply electrode may be configured to guide an electrical contact of an image forming apparatus in one or more directions. In some examples, the developing electrode and supply electrode may have angled surfaces that extend toward one another.