Swingable Developing Cartridge Alignment Mechanism
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in achieving stable contact pressure between the developing roller and the photosensitive drum due to misalignment and tolerance issues, leading to uneven contact pressure and reduced accuracy in positioning the developer carrying member.
Innovation Solution
The image forming apparatus incorporates a dual-bearing system with regulated portions for the developer carrying member and image bearing member, allowing for integral swinging motion between two swingable members to ensure precise alignment and stable contact pressure by engaging regulated portions when the developer member is in contact or spaced from the image bearing member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the developing roller is swingably supported on one end side relative to the photosensitive drum, then alignment deviation is allowed, but the position of the developing roller varies and contact pressure becomes unstable
Solution Approach 1:
The support structure is divided into two separate swingable support portions: a first swingable support portion at one end of the developing roller and a second swingable support portion at the other end. This segmentation allows each end to independently accommodate misalignment while maintaining stable contact pressure through the regulated portions that limit excessive movement.
Solution Approach 2:
Regulated portions are introduced as intermediary elements between the swingable support portions and the developing roller. These regulated portions act as mediators that constrain the swinging motion to appropriate ranges, preventing both excessive movement and rigid positioning, thereby stabilizing contact pressure while maintaining alignment tolerance.
2Adaptability or versatility
If the developing cartridge is swingable relative to the photosensitive drum, then misalignment is accommodated, but contact pressure becomes uneven
Solution Approach 1:
Different portions of the developing roller are supported with different characteristics: the first swingable support portion and second swingable support portion provide localized adaptive support at each end, while the regulated portions provide localized constraint. This creates a system where each local region has optimized properties for both adaptability and precision.
Solution Approach 2:
The support structure transitions from a static rigid support to a dynamic swingable support with regulated motion. The developing roller can swing within controlled ranges at both ends, allowing the system to dynamically adapt to misalignment while the regulated portions ensure the motion remains within precision boundaries.
3Volume of moving object
If the angle θZ2 for stabilizing the developing roller position is not substantially right angle, then miniaturization is achieved, but positioning accuracy may be compromised
Solution Approach 1:
The positioning problem is solved by adding a temporal/dynamic dimension rather than relying solely on geometric constraints. Instead of fixing the roller position through rigid angular constraints (2D geometric solution), the roller is allowed to swing dynamically to its equilibrium position (adding time/motion dimension), achieving accurate positioning without requiring precise angular geometry.
Solution Approach 2:
The developing roller automatically positions itself through the swinging motion enabled by the dual swingable support portions. The regulated portions guide the roller to its correct position without requiring external adjustment mechanisms, allowing the system to self-position accurately even with non-right-angle geometry for miniaturization.
Data Source
AI summary
An image forming apparatus includes a main assembly, a rotatable image bearing member, and a cartridge detachably mountable to the main assembly, the cartridge including a rotatable developer carrying member. A first swingable member is provided in the main assembly, engages with one end of the cartridge in an axial direction of the developer carrying member when the cartridge is mounted in the main assembly, and swings integrally with the cartridge, and a second swingable member is provided in the main assembly, engages with the other end of the cartridge in the axial direction of the developer carrying member when the cartridge is mounted in the main assembly, and swings integrally with the cartridge.