Developing Cartridge Cover Layout for Compact Drum Engagement
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Solution Overview
Problem
The challenge of downsizing a developing cartridge in electrophotographic printers is hindered by the need to accommodate engagement protrusions on both side walls, which limits design freedom due to the presence of other components requiring space for drive force and electric power supply.
Innovation Solution
The developing cartridge is designed with a first and second gear system, covered by respective covers with engagement portions, allowing the developer carrier to be moved away from the photosensitive member in a perpendicular direction, reducing the need for engagement protrusions on the side walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engagement protrusions are provided on both side walls of the developing cartridge, then the developing cartridge can be properly engaged with the photosensitive drum, but the space for installing these protrusions is limited due to other components requiring space for drive force and electric power supply
Solution Approach 1:
The patent moves the engagement protrusions from the side walls to the front end surface of the developing cartridge. This dimensional relocation allows the protrusions to be positioned in a different spatial plane, avoiding conflict with components on the side walls and enabling downsizing of the developing cartridge while maintaining engagement functionality.
Solution Approach 2:
The patent divides the engagement function into multiple protrusions arranged in the axial direction on the front end surface. This segmentation allows the engagement mechanism to be distributed across different locations, improving engagement reliability while utilizing the available space more efficiently.
2Reliability
If engagement protrusions are provided on both side walls of the developing cartridge, then the developing cartridge can be properly engaged with the photosensitive drum, but the design freedom is limited due to space constraints from other components
Solution Approach 1:
The patent relocates engagement protrusions from the side walls to the front end surface, changing the spatial dimension of engagement. This relocation provides design freedom by allowing different component arrangements on the side walls while maintaining reliable engagement through the front-end protrusions.
Solution Approach 2:
The front end surface of the developing cartridge serves multiple functions: it provides engagement protrusions for drum contact, accommodates drive force transmission, and allows space for other components. This multi-functionality increases design freedom by consolidating functions in a single region.
3Volume of moving object
If the developing cartridge is downsized, then space efficiency is improved, but it becomes difficult to secure space for installing engagement protrusions on the side walls
Solution Approach 1:
The patent relocates engagement protrusions from the side walls to the front end surface, utilizing a different spatial dimension. This allows downsizing of the developing cartridge volume while maintaining engagement reliability through the front-end protrusion arrangement.
Solution Approach 2:
The patent employs nipping levers that can dynamically adjust the engagement force between the front engagement protrusions and the photosensitive drum. This dynamic adjustment ensures reliable engagement even with the reduced size of the developing cartridge.
Data Source
AI summary
A process cartridge including: a photosensitive member cartridge including a photosensitive member; and a developing cartridge including a developer carrier. The developing cartridge further includes: an inputting portion; a first cover; and a second cover. The first cover has a first engagement portion configured to move the developer carrier away from the photosensitive member. The first engagement portion is positioned between an axis of the developer carrier extending in an axial direction and an axis of the inputting portion extending in the axial direction, when projected in the axial direction. The second cover has a second engagement portion configured to move the developer carrier away from the photosensitive member. The second engagement portion is positioned between the axis of the developer carrier and the axis of the inputting portion, when projected in the axial direction.