Shaft-Receiving Device for Drum Positioning
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Solution Overview
Problem
Existing tandem-type color printers face challenges in precisely positioning photosensitive drums relative to a frame, leading to potential image-forming irregularities and color registration issues due to thermal expansion and mechanical misalignment.
Innovation Solution
The drum unit incorporates shaft-receiving members with integrated pressing mechanisms and notch parts, which securely position photosensitive drums within drum support holes, allowing for precise alignment and thermal expansion compensation, ensuring consistent drum positioning despite temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drum mounting structures are used, then assembly is simple, but positioning precision of photosensitive drums deteriorates due to thermal expansion and mechanical misalignment
Solution Approach 1:
The shaft-receiving member incorporates an elastic pressing member that can dynamically adjust its pressing force. The pressing member elastically deforms to apply continuous pressing force on the photosensitive drum, compensating for thermal expansion and mechanical misalignment while maintaining positioning precision without requiring complex rigid structures
Solution Approach 2:
The elastic pressing member changes its physical state (elastic deformation) in response to thermal expansion, allowing the structure to adapt to temperature variations. This parameter change enables the system to maintain positioning precision under varying thermal conditions without complex compensation mechanisms
2Stability of the object's composition
If rigid fixed structures are used, then positioning stability is improved, but adaptability to thermal expansion deteriorates
Solution Approach 1:
The shaft-receiving member is designed to utilize thermal expansion principles through its elastic pressing member. The elastic material naturally expands and contracts with temperature changes, allowing the structure to adapt to thermal expansion while maintaining stable positioning through continuous elastic pressing force
Solution Approach 2:
The elastic pressing member provides dynamic adaptation to thermal conditions while maintaining stable positioning. The elastic deformation allows the structure to respond to thermal expansion in real-time, balancing stability and adaptability without requiring complex active control systems
3Manufacturing precision
If multiple separate components are used for drum positioning, then positioning precision is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The shaft-receiving member integrates multiple functions (positioning, pressing, and support) into a single component. The elastic pressing member is formed as an integral part of the shaft-receiving member, eliminating the need for separate pressing mechanisms and reducing manufacturing complexity and cost while maintaining positioning accuracy
Solution Approach 2:
The shaft-receiving member serves multiple functions simultaneously: it positions the photosensitive drum, provides elastic pressing force for alignment, and supports the drum structure. This multi-functionality reduces the number of components needed, simplifying manufacturing while achieving precise drum alignment
Data Source
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AI summary
A shaft-receiving device connects a rotating member and a frame. The rotating member has a rotational axis extending in a first direction and at least one end in the first direction. The frame extends in a second direction perpendicular to the first direction and is formed with a through-hole having an inner peripheral surface. The shaft-receiving device includes a shaft-receiving portion and a pressing member. The one end is inserted into the shaft-receiving portion in the first direction. The shaft-receiving portion is inserted into the through-hole in the first direction and opposes the inner peripheral surface in the second direction. The pressing member opposes the inner peripheral surface in the second direction to press the rotating member toward the inner peripheral surface.