Development Device Frame Alignment via Engageable Portions
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Solution Overview
Problem
Existing development devices face challenges in reducing size while maintaining sufficient faying surfaces, often requiring thicker sidewalls that increase the device's size and lead to alignment issues and distortions.
Innovation Solution
A development device design featuring a first frame with engageable portions and a second frame that aligns by fixing specific walls and extension portions, eliminating the need for positioning bosses on the weld surface, allowing for a compact and accurate assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the sidewalls of the lower frame are thickened to provide sufficient faying surface area, then the welding surface area is increased, but the size of the development device increases
Solution Approach 1:
The engageable portions extend in the vertical direction (upward from the weld surface) to provide additional contact area for alignment, rather than increasing the horizontal thickness of the sidewalls. This allows sufficient engagement area without increasing the overall device volume.
Solution Approach 2:
The alignment function is segmented from the sidewall structure itself and implemented through separate engageable portions (protrusions and corresponding recesses) that can be engaged independently, allowing precise alignment without requiring thickened sidewalls.
2Manufacturing precision
If boss structures are formed on the upper surface of the lower frame for alignment, then alignment precision is improved, but the device complexity increases
Solution Approach 1:
The alignment function is merged into the engageable portions that are already part of the welding assembly process. The same structural features that join the frames together also provide alignment, eliminating the need for separate boss structures and reducing overall complexity.
Solution Approach 2:
The engageable portions serve multiple functions: they provide welding surface area, ensure precise alignment during assembly, and maintain structural integrity. This multi-functionality reduces the need for additional dedicated alignment features.
3Strength
If the upper frame is welded on the upper surface of the lower frame, then the frames are securely connected, but alignment distortions occur
Solution Approach 1:
The engageable portions (protrusions and recesses) are pre-formed on the frames before welding. These features establish precise alignment and mechanical engagement prior to the welding process, preventing alignment distortions that would otherwise occur during welding.
Solution Approach 2:
The engageable portions act as intermediary elements between the two frames during assembly. They provide a mechanical interface that guides and maintains precise alignment while the welding process secures the connection, separating the alignment function from the welding operation itself.
Data Source
AI summary
A development device includes a first frame and a second frame. The second frame is configured to be combined with the first frame by fixing first, second and third walls of the first frame to the second frame. The first and second walls are disposed opposite to each other, and the third wall is configured to connect the first and second walls. An opening is formed by the combined first and second frames. The first frame includes first and second engageable portions, and the second frame includes third and fourth engageable portions, such that engagement of the first and second engageable portions with the third and fourth engageable portions brings the first and second frames into alignment. The first and second engageable portions are disposed between the first wall and the second wall.