Charging Roller Swing Mechanism for Drum Protection
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Solution Overview
Problem
The roller charging type in image forming apparatuses requires careful attachment to prevent the charging roller from rubbing against the photoconductive drum, necessitating skilled labor and time-consuming procedures to secure the charging roller in place.
Innovation Solution
The image forming apparatus incorporates a housing, a charging roller, a bearing member, a holding member, an urging member, and a fixing section that allows the charging roller to be easily attached by sliding it into position, using coil springs and engaging protrusions and grooves to secure it without direct contact with the photoconductive drum during attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging roller is brought into contact with the photoconductive drum to charge it, then charging function is achieved, but the charging roller may rub against the photoconductive drum causing damage
Solution Approach 1:
The charging roller is designed to be swingable rather than fixed, allowing it to dynamically adjust its position. It can swing between a charging position (contacting the photoconductive drum) and a retracted position (away from the drum), enabling controlled contact only when needed for charging while preventing unwanted rubbing during attachment or operation.
2Stability of the object's composition
If the charging roller is secured with screws to prevent separation, then contact stability is improved, but attachment complexity and time increase
Solution Approach 1:
The charging roller assembly incorporates a swing mechanism with automatic positioning features. The roller swings into place and can be secured through simple engagement rather than requiring skilled screw attachment. The design enables even inexperienced users to attach the charging roller quickly without specialized tools or skills, while still achieving stable contact during operation.
3Object-affected harmful factors
If the charging roller is swung centering on one end side to prevent rubbing, then rubbing is prevented, but attachment skill requirement increases
Solution Approach 1:
The charging roller assembly is divided into separable components that can be independently positioned. The swing mechanism allows the charging roller to be attached in a standardized manner without requiring precise manual positioning, as the mechanical design guides proper alignment. This segmentation and standardized interface reduce the skill requirement while maintaining rubbing prevention through controlled positioning.
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
This design simplifies the attachment process, allowing anyone to securely attach the charging roller without risk of it rubbing against the photoconductive drum, reducing the need for skilled labor and time while ensuring proper alignment and contact during operation.
Implementation Method 1
an urging member that urges the bearing member in the first direction with respect to the holding member
Data Source
AI summary
An image forming apparatus includes a housing, a charging roller, an image forming section, a bearing member, a holding member, an urging member, a fixing section, and an unfixing section. A cylindrical image bearing body is attached to the housing. The charging roller comes into contact with the surface of the image bearing body and charges the surface. The image forming section forms an image on the charged surface. The holding member holds the bearing member. The urging member urges the bearing member in a first direction. The fixing section fixes the bearing member in a first position. The unfixing section separates the charging roller from the surface of the image bearing body and positions the holding member in the housing, unfixes the bearing member, moves the bearing member to a second position, and brings the charging roller into contact with the surface of the image bearing body.