Image Forming Apparatus Guide Rail Width Reduction
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Solution Overview
Problem
The existing image forming apparatuses face challenges in reducing the space occupied by guide rails for attaching and detaching process cartridges, which limits the degree of freedom in arranging parts within the frame.
Innovation Solution
The apparatus employs a first guide rail with a reduced width to guide a protruding rib of the process cartridge instead of the bearing that supports one end of the photosensitive drum, allowing for a smaller footprint and increased part arrangement flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first guide rail guides the bearing supporting one end of the photosensitive drum, then the guide rail provides stable support, but the guide rail occupies larger space in the width direction
Solution Approach 1:
The patent introduces a protruding rib as an intermediary element between the cartridge frame and the first guide rail. This rib serves as a dedicated guiding feature that transmits the guiding function from the large bearing to a smaller interface, allowing the first guide rail to be narrower while still providing stable support during attachment and detachment operations.
2Area of stationary object
If the first guide rail is reduced in width, then the space occupied in the first frame is reduced and part arrangement flexibility is increased, but the guide rail must guide a different component (protruding rib instead of bearing)
Solution Approach 1:
The patent segments the guiding function into two distinct components: the protruding rib on the cartridge frame that provides the guiding interface, and the first guide rail on the support frame that receives this interface. This segmentation allows the guide rail to be optimized for minimal width while the rib accommodates the functional requirements, reducing overall complexity compared to a single large guide structure.
Data Source
AI summary
A cartridge frame includes a protruding rib protruding toward a first frame, a first bearing supporting one end of a photosensitive drum in an axial direction, and a second bearing supporting an other end of the photosensitive drum in the axial direction. The first frame includes a first guide rail configured to, when a process cartridge is attached to an apparatus main body, guide the protruding rib to slide along the first guide rail. A second frame includes a second guide rail configured to, when the process cartridge is attached to the apparatus main body, guide the second bearing to slide along the second guide rail. A size of the first guide rail in a width direction perpendicular to both the axial direction and an attachment direction of the process cartridge is smaller than a size of the second guide rail in the width direction.