Photosensitive Member Unit Positioning via Angled Pressing Force
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Solution Overview
Problem
In color image forming apparatuses, accurate positioning of photosensitive members relative to the exposure unit is crucial to prevent deviations in color superimposition, leading to defective images, and existing solutions are complex and not easily adaptable for precise mounting.
Innovation Solution
A photosensitive-member unit with a leading end and trailing end, where the trailing end is pressed in a direction intersecting the reference direction, providing both a first component in the reference direction and a second component perpendicular to it, ensuring accurate positioning through contact with reference members on the main body, allowing for simple and precise mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a photosensitive member cartridge with multiple photosensitive members is detachably mounted on the apparatus main body, then ease of replacement and maintenance is improved, but positioning accuracy deteriorates due to variations in arrangement of each photosensitive member relative to the exposure unit
Solution Approach 1:
The invention divides the positioning function into two segments: a reference member fixed to the apparatus main body and a pressing member on the photosensitive member cartridge. This segmentation allows the cartridge to be detachably mounted while ensuring precise positioning through the interaction between these two segmented components, resolving the contradiction between ease of replacement and positioning accuracy.
Solution Approach 2:
The pressing member acts as an intermediary element between the photosensitive member cartridge and the reference member. It transmits the pressing force and establishes the precise positioning relationship, ensuring that even when the cartridge is detachably mounted, the photosensitive members maintain accurate alignment with the exposure unit.
2Device complexity
If the pressing member applies pressing force in a direction perpendicular to the reference direction, then the structure is simplified, but positioning accuracy in the reference direction deteriorates
Solution Approach 1:
The pressing force is applied in a direction that intersects the reference direction at an angle, introducing a dimensional component that has both a perpendicular component (simplifying structure) and a parallel component (ensuring positioning accuracy). This dimensional approach allows the pressing member to achieve both structural simplicity and positioning precision simultaneously.
Data Source
AI summary
A pressing member applies a pressing force to a trailing end in a direction which intersects a predetermined reference direction, allowing the pressing force to have both a first component in the predetermined reference direction and a second component perpendicular to the predetermined reference direction. A trailing end is pressed in the predetermined reference direction by the first component. In the mounted state, the leading end is in contact with the reference member at two contact surfaces including a first contact surface and a second contact surface. The first contact surface defines a first positioning direction being perpendicular to the first contact surface and intersecting the predetermined reference direction. The second contact surface defines a second positioning direction being perpendicular to the second contact surface and intersecting both the predetermined reference direction and the first positioning direction, allowing the photosensitive-member unit to be positioned with respect to the main body.