Developing Roller Cartridge Spacing for Uniform Drum Contact
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Solution Overview
Problem
Existing image forming apparatuses with contact developing systems face challenges in precisely spacing and uniformly pressing the photosensitive drum and developing roller, leading to complexity and potential deformation of the developing roller due to constant contact.
Innovation Solution
A cartridge design with a movable part and elastic parts that receive forces from the apparatus main assembly to precisely control the movement of the developing roller, allowing it to be spaced from the photosensitive drum when not in use, using a frame, movable parts, and elastic components to manage the pressing and spacing actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressing unit is provided to bring the photosensitive drum and developing roller into contact, then image formation is enabled, but the photosensitive drum and developing roller cannot be spaced when not forming images, leading to potential deformation and reduced longevity
Solution Approach 1:
The pressing unit is designed with a movable pressing member that can dynamically change position between a pressing state (contact) and a non-pressing state (spaced). The pressing member is movably supported by the frame, allowing it to shift position in response to elastic force from the elastic part, enabling the photosensitive drum and developing roller to be spaced when not forming images, thus preventing deformation and extending longevity while maintaining operational functionality
2Manufacturing precision
If the pressing unit is integrated in the axial direction of the developing roller, then uniform pressing is achieved, but the pressing unit becomes highly precise and highly rigid, making the configuration more complicated
Solution Approach 1:
The pressing member is designed with a pressing surface that extends in the axial direction of the developing roller, allowing flexible contact across the width of the developing roller. This configuration enables uniform pressing without requiring highly precise and rigid structures, as the extended pressing surface naturally distributes the pressing force evenly across the developing roller's axial length, simplifying the overall pressing unit design while maintaining manufacturing precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise and uniform movement of the developer bearing member, reducing deformation and maintaining image quality and longevity of the photosensitive drum and developing roller.
Implementation Method 1
an elastic part provided between the frame and the movable part to urge the movable part
Data Source
AI summary
A cartridge includes a developing roller rotatable about a rotational axis thereof. A frame is configured to support the developing roller. A lever is connected to the frame, with the lever being movable relative to the frame, and a part of the lever protruding beyond the frame. A surface of the developing roller extends a longer distance in a direction of the rotational axis than a distance that the lever extends in the direction of the rotational axis.