Charging Roller Bearing With Nested Concave Receiving Portions
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Solution Overview
Problem
Existing charging devices for image forming apparatuses face challenges in effectively removing unwanted matter from the surface of charging rollers, as existing cleaning mechanisms may not ensure comprehensive contact and stability, leading to incomplete cleaning and potential device malfunction.
Innovation Solution
A charging device design incorporating a rotating charging member and a cleaning member with a helical surface, supported by bearing members with concave-shaped receiving portions, ensures comprehensive contact and stability, allowing the cleaning roller to effectively remove unwanted matter from the charging roller's surface while preventing it from coming off during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cleaning roller is used to remove unwanted matter from the charging roller surface, then cleaning effectiveness is improved, but the cleaning roller may become dislodged during rotation
Solution Approach 1:
The bearing member includes a first receiving portion that receives the charging roller's rotating shaft and a second receiving portion that receives the cleaning roller's rotating shaft. The nested receiving portions provide stable positioning for both rollers, preventing the cleaning roller from becoming dislodged while maintaining cleaning effectiveness.
Solution Approach 2:
The bearing member acts as an intermediary component between the charging roller and cleaning roller. It provides a stable mounting structure with receiving portions that secure both rollers' rotating shafts, ensuring the cleaning roller maintains proper position during operation without interfering with the cleaning function.
2Reliability
If the cleaning roller is pressed against the charging roller for cleaning, then unwanted matter removal is improved, but the cleaning roller may become unstable during rotation
Solution Approach 1:
The nested receiving portions of the bearing member provide stable support for both the charging roller and cleaning roller. This nested structure ensures that the cleaning roller remains stable during rotation even when pressed against the charging roller for effective unwanted matter removal.
Solution Approach 2:
The bearing member's receiving portions are designed to automatically stabilize the cleaning roller during rotation. The concave-shaped bottoms of the receiving portions provide natural positioning that maintains cleaning roller stability without requiring additional active control mechanisms.
Data Source
AI summary
A charging device includes a charging member that includes a rotating shaft and charges a surface of a charging object while rotating in contact with the charging object, a cleaning member that includes a rotating shaft and removes unwanted matter from a surface of the charging member while rotating in contact with the charging member, and a bearing member that includes first and second receiving portions each having an open part on one side thereof and a substantially concave-shaped bottom on another side thereof. The first and second receiving portions receive circumferences of the rotating shafts of the charging member and the cleaning member, respectively, at the bottoms thereof. The open parts of the first receiving portion and the second receiving portion face respectively different directions. A part of an inner surface of the second receiving portion forms a part of an outer surface of the first receiving portion.