Curved Positioning Convex Part for ADF Shear Force Reduction
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Solution Overview
Problem
Conventional image reading apparatuses face risks of damage to the convex part or concave part due to shearing forces when the automatic document feeder (ADF) is closed, and similarly, positioning pins or boss holes are at risk of breaking when lateral sliding forces are applied, leading to potential damage to originals and mechanical components.
Innovation Solution
The image reading apparatus incorporates a positioning convex part with a curved surface and a positioning concave part with inclined surfaces, which are designed to securely position the ADF and reduce shearing forces by allowing the openable part to slide laterally without applying pressure directly on the convex or concave parts, thereby minimizing the risk of damage to the original and the mechanical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the convex part and concave part are fitted to position the ADF, then positioning accuracy is improved, but the risk of damage increases due to shearing forces when lateral sliding occurs
Solution Approach 1:
The convex part is designed with a curved surface instead of a flat surface. This curved geometry allows the convex part to engage with the concave part in a way that distributes forces more evenly and reduces concentration of shearing forces at specific points, thereby reducing the risk of damage while maintaining positioning accuracy
Solution Approach 2:
The positioning mechanism uses a composite structure combining the convex part with curved surface and the concave part with inclined surfaces. This composite design creates a multi-faceted engagement system that handles both positioning and force distribution, reducing the likelihood of damage under lateral sliding conditions
2Object-affected harmful factors
If the positioning pin protrudes higher to prevent damage when covering, then original protection is improved, but the risk of pin breaking increases due to shearing forces
Solution Approach 1:
The positioning pin is designed with a curved surface instead of a flat or pointed surface. This curvature allows the pin to engage smoothly with the positioning boss hole, distributing forces more evenly and reducing stress concentration, thereby maintaining both protection function and structural strength
Solution Approach 2:
The curved surface of the positioning pin acts as a cushioning element that anticipates and distributes lateral sliding forces before they can cause damage. The curved geometry allows for gradual engagement and force distribution, preventing sudden stress spikes that could break the pin
Data Source
AI summary
An image reading apparatus includes a main body part and an openable part. On an upper surface of the main body part, a first reading surface, a second reading surface and a first guide part arranged between the two reading surfaces are provided. When a direction parallel to a direction in which an original passes over the second reading surface is defined as a first direction, and a direction parallel to the second reading surface and orthogonal to the first direction is defined as a second direction, on the upper surface, a positioning convex part having a curved surface curved downward when viewed in the second direction is provided on an extended line of the first guide part. On a lower surface of the openable part, a positioning concave part having two inclined surfaces respectively contacting the curved surface when viewed in the second direction is provided.