Resin Frame Load Distribution in Image Forming Apparatus
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Solution Overview
Problem
The existing image forming apparatuses with metallic frames for supporting image forming units have a high weight and stiffness, leading to deformation issues when a load is applied, particularly due to the concentration of load on central support projections during drops or movements.
Innovation Solution
The use of a resin frame with strategically positioned support projections and projection parts that disperse the load to the frame's end portions, reducing deformation risk by transmitting the load to areas less prone to deformation, and incorporating beam-shaped plates to enhance stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic frames are used for side frames, then stiffness is improved, but weight increases
Solution Approach 1:
The patent changes the material parameter from metal to resin, fundamentally altering the weight-stiffness characteristics. This material substitution enables the frame to achieve adequate stiffness while dramatically reducing weight compared to traditional metallic frames.
Solution Approach 2:
The patent employs a composite structure combining resin frame material with strategically positioned projection parts. This composite approach allows the resin frame to achieve enhanced stiffness at critical locations while maintaining the overall weight advantage of resin construction.
2Weight of stationary object
If resin frames are used for side frames, then weight is reduced, but stiffness deteriorates
Solution Approach 1:
The patent applies local quality enhancement by adding projection parts at specific locations on the resin frame. These projections concentrate structural reinforcement at critical load-bearing areas (where drawers contact the frame) while keeping the rest of the frame lightweight, thus achieving localized stiffness improvement without compromising overall weight reduction.
3Ease of operation
If support projections are concentrated at the central part of the side frame, then electrode support is improved, but deformation increases under load
Solution Approach 1:
The patent segments the support function by creating multiple projection parts distributed across different locations on the frame. Instead of concentrating all support at the center, the projections are divided and positioned at multiple points, including end portions and central areas, thereby distributing the load and preventing deformation while maintaining electrode support capability.
Solution Approach 2:
The patent extends the support structure from a single central plane to a distributed three-dimensional arrangement. Projection parts are positioned at various locations including end portions and central areas of the frame, creating a spatial distribution of support points that enhances structural stability under load while maintaining electrical connection functionality.
Data Source
AI summary
An image forming apparatus includes a plurality of image forming units in an arrangement direction orthogonal to a rotary axis thereof; a support member configured to support the plurality of image forming units; a frame, which is configured to support the support member, and a plurality of electrodes, which is supported to the frame and is configured to supply power to the plurality of image forming units, wherein the frame comprises: a plurality of support projections, which protrudes inwardly to support the plurality of electrodes, and a projection part, which is arranged at an outer position of the plurality of support projections, at which the projection part overlaps with the support member, as viewed from the direction of the rotary axis, and is contactable to the support member in a case where the support member is moved towards the frame.