Photosensitive Unit Cartridge Alignment Mechanism
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Solution Overview
Problem
In color laser printers, incomplete mounting of developer cartridges to the drum unit hinders the smooth feeding of toner to photosensitive drums, leading to operational issues and increased user complexity in handling the printer.
Innovation Solution
The design includes a photosensitive unit with a frame supporting multiple photosensitive bodies in parallel, detachable developer cartridges, and a pressing mechanism that shifts cartridges between two attitudes for proper alignment and mounting, ensuring all cartridges are in the correct position when the unit is attached to the printer body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If developer cartridges are made detachable for easy replacement, then ease of operation is improved, but reliability deteriorates because incomplete mounting can occur
Solution Approach 1:
The abutment portion is positioned to engage with the cartridge in advance during the mounting process, automatically ensuring the cartridge reaches the correct position before operation begins. This preliminary mechanical guidance prevents incomplete mounting without requiring user verification.
2Ease of operation
If cartridges can be easily removed from the drum unit, then ease of operation is improved, but device complexity increases due to additional mounting mechanisms
Solution Approach 1:
The cartridge mounting system is segmented into simple, discrete components: the abutment portion on the drum unit and the corresponding engagement feature on the cartridge. This segmentation allows for easy manual operation while keeping the overall mechanism simple rather than complex.
3Ease of operation
If the drum unit is mounted to the main body with cartridges not completely mounted, then ease of operation is improved by allowing partial mounting, but productivity deteriorates due to operational failures
Solution Approach 1:
The abutment portion automatically guides and positions the cartridge during mounting without requiring user intervention to verify completion. The mechanism self-ensures proper cartridge positioning as part of the mounting action itself, eliminating both partial mounting possibilities and the need for user verification.
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 solution ensures the printer operates efficiently by guaranteeing all developer cartridges are correctly aligned and mounted, simplifying the handling process and preventing operational failures due to incomplete mounting.
Implementation Method 1
an abutment portion abutting the cartridge in the second attitude thereby bringing the cartridge into the first attitude when the photosensitive unit is mounted to the image forming apparatus body
Implementation Method 2
a pressing portion provided on the frame for pressing the cartridges to direct the developer carrier toward the corresponding photosensitive body
Data Source
AI summary
An image forming apparatus is described. The image forming apparatus may include an image forming apparatus body and a photosensitive unit detachably mountable to the image forming apparatus body. The photosensitive unit includes: a frame; photosensitive bodies supported by the frame; cartridges including a developer carrier and detachably mountable to the frame; and a pressing portion provided on the frame for pressing the cartridges to direct the developer carrier toward the corresponding photosensitive body. Each cartridge can shift in the frame to a first attitude pressed by the pressing portion, and a second attitude released from the press of the pressing portion and detachable from the frame. The image forming apparatus body is provided with an abutment portion abutting the cartridge in the second attitude thereby bringing the cartridge into the first attitude when the photosensitive unit is mounted to the image forming apparatus body.