Image Forming Apparatus Frame Coupling Rigidity
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Solution Overview
Problem
The existing configuration of image forming apparatuses suffers from low rigidity in the coupling portion between frames, leading to deterioration in relative positional accuracy between struts, which results in sheet skewing and compromised image quality during the conveyance process.
Innovation Solution
The design enhances the rigidity of the coupling portion between the upper and lower frames by using a combination of outer and inner members with U-shaped sections, secured through screws, to directly couple the upper-right strut and lower-right strut, ensuring precise positioning and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pin and mounting hole coupling is used between frames, then the assembly process is simple, but the rigidity of the coupling portion is low
Solution Approach 1:
The patent merges the coupling function into the stay structure itself by forming a coupling groove directly on the stay, eliminating the need for separate pins and mounting holes. This integration creates a more rigid coupling while maintaining assembly simplicity, as the groove is formed as part of the stay manufacturing process rather than requiring additional assembly steps.
Solution Approach 2:
The coupling portion is designed as a composite structure combining the stay member with an integrated coupling groove. This composite design allows the stay to serve dual functions: structural support and frame coupling, thereby enhancing the overall rigidity of the coupling portion while simplifying the assembly process.
2Adaptability or versatility
If indirect positioning is used between struts, then the frame assembly is flexible, but the relative positional accuracy deteriorates
Solution Approach 1:
The patent segments the positioning function from the coupling function by introducing a separate positioning protrusion that engages with a positioning groove. This segmentation allows the coupling to remain flexible for assembly while the dedicated positioning elements ensure high relative positional accuracy between struts, as the positioning protrusion and groove are specifically designed to maintain precise alignment.
3Ease of manufacture
If low rigidity coupling is used, then the assembly process is simple, but the coupling deforms under impact and load
Solution Approach 1:
The patent merges the coupling function into the stay structure by forming a coupling groove directly on the stay, eliminating the need for separate pins and mounting holes. This integration creates a more rigid coupling while maintaining assembly simplicity, as the groove is formed as part of the stay manufacturing process rather than requiring additional assembly steps.
Solution Approach 2:
The coupling groove is designed with a curved surface that matches the curvature of the positioning protrusion. This curved geometry allows for smooth engagement and load distribution, enhancing the coupling's ability to resist deformation under impact and load while maintaining assembly simplicity.
Data Source
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AI summary
A frame (100) of an image forming apparatus (A), includes: a first frame (70); a second frame (50) disposed above the first frame (70), the second frame (50) being coupled to the first frame (70); and a coupling member (74b) coupling a first strut (74) and a second strut (54), the coupling member including: a third base portion (74b1) opposed to and spaced apart from a first base portion (74a1) and a second base portion (54a1); a fifth plate portion (74b2) being coupled to a first plate portion (74a2) and a third plate portion (54a2); and a sixth plate portion (74b3) being coupled to a second plate portion (74a3) and a fourth plate portion (54a3).