Image-Forming Apparatus Drum Frame Support Structure
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Solution Overview
Problem
In electro-photographic type image-forming apparatuses, the process cartridge can easily fall off the cartridge-door guide due to impacts or vibrations, and there is a need for easy replacement of the toner cartridge while maintaining the drum cartridge in place.
Innovation Solution
The image-forming apparatus includes a housing with an opening part and a cover that moves between closed and opened positions, featuring first and second support parts to securely hold the drum frame, allowing the toner cartridge to be easily attached and detached from the drum frame when the cover is open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the process cartridge is temporarily placed on the cartridge-door guide, then the cartridge door can be opened for replacement or maintenance, but the process cartridge may easily fall off due to small impact or vibration
Solution Approach 1:
The patent introduces a support structure as an intermediary between the cartridge door guide and the process cartridge. This support structure includes a support table and support protrusions that act as mediators to securely hold the process cartridge in place, preventing it from falling off while maintaining ease of access for replacement operations.
Solution Approach 2:
The patent implements protective structures (support table and support protrusions) in advance before the cartridge can fall. These structures are positioned to preemptively prevent displacement caused by impacts or vibrations, cushioning against potential failures rather than reacting after the cartridge has already fallen.
2Reliability
If the process cartridge is securely fixed to prevent falling, then positioning stability is improved, but the toner cartridge replacement becomes more difficult
Solution Approach 1:
The patent divides the process cartridge into two separable parts: the drum cartridge (with photosensitive drum) and the toner cartridge. The support structure is designed to hold only the drum cartridge securely, while the toner cartridge can be independently removed. This segmentation allows the drum cartridge to remain stabilized during operation while enabling easy toner cartridge replacement when needed.
Solution Approach 2:
The support structure provides localized support specifically to the drum cartridge portion of the process cartridge. The support table and support protrusions are positioned to contact and stabilize the drum cartridge, while leaving the toner cartridge area accessible for removal. This local differentiation of support quality enables simultaneous stability and ease of replacement.
Data Source
AI summary
An image-forming apparatus includes: a housing formed with an opening part; and a process cartridge detachably attachable to the housing through the opening part in a first direction. The housing includes a first support part arranged at the opening part, and a cover movable between a closed position and an opened position. The cover includes a second support part positioned away from the first support part in the first direction when the cover is at the opened position. The process cartridge includes: a drum cartridge having a drum frame; and a toner cartridge detachably attachable to the drum frame. When the cover is at the opened position, the first support part and the second support part are configured to support the drum frame of the process cartridge detached from the housing to restrict displacement of the drum frame in the first direction.