Detachable Unit Positioning Layout for Stiff Image-Forming Frames
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Solution Overview
Problem
Existing image forming apparatuses face reduced stiffness of side panels supporting process cartridges, leading to deteriorated positioning accuracy of detachable units.
Innovation Solution
The image forming apparatus incorporates a frame member with non-coplanar positioning portions on the side panels, where the second positioning portion is closer to the center of the detachable unit, ensuring alignment and maintaining stiffness by reducing the area of cutouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two large rail-like grooves are formed on the same plane of the side panel, then the detachable unit can be positioned, but the stiffness of the side panel is reduced
Solution Approach 1:
The patent transitions from forming grooves on the same plane (2D arrangement) to forming grooves at different depths/levels (3D arrangement). Specifically, the first groove is formed on a first surface while the second groove is formed on a second surface at a different depth, creating a stepped configuration that maintains panel stiffness while achieving positioning functionality.
Solution Approach 2:
The positioning function is segmented into two separate grooves located at different positions and depths on the side panel. Instead of using one large groove or two grooves on the same plane, the patent divides the positioning task across multiple spatial locations, with each groove contributing to the overall positioning accuracy while minimizing impact on structural integrity.
2Manufacturing precision
If two large rail-like grooves are formed on the side panel, then positioning function is achieved, but weight and material usage increase
Solution Approach 1:
By utilizing the third dimension (depth) to position the second groove on a different surface level, the patent reduces the need for large-area material removal. The grooves are positioned at different depths rather than expanding laterally, which minimizes material usage and reduces panel weight while maintaining positioning effectiveness.
3Manufacturing precision
If two large rail-like grooves are formed on the same plane, then positioning is achieved, but the area of the side panel is reduced
Solution Approach 1:
The patent resolves the area conflict by moving the second groove to a different depth level (second surface) rather than placing it on the same plane as the first groove. This vertical separation allows both grooves to coexist with minimal overlap in their horizontal footprint, preserving more of the side panel's effective area while achieving accurate positioning.
Data Source
AI summary
An image forming apparatus configured to form an image on a sheet, the image forming apparatus includes an apparatus body, and a detachable unit. The detachable unit includes a first positioned portion and a second positioned portion. The apparatus body includes a frame member having a first positioning portion and a second positioning portion which respectively engage with the first positioned and second positioned portion, so that the detachable unit is positioned with respect to frame member in the attaching direction and the first direction. The second positioning portion is arranged closer to a center portion of the detachable unit in the second direction than the first positioning portion.