Swingable Electric Contact Surface for Developing Cartridge
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Solution Overview
Problem
Existing developing cartridges experience rubbing issues with electric contact surfaces during insertion, which can lead to damage and poor contact reliability with image forming apparatus terminals.
Innovation Solution
The developing cartridge design includes a swingable lever and storage medium with an electric contact surface that moves between retreat and advance positions, allowing the contact surface to swing and maintain contact with the terminal without rubbing, facilitated by a movable housing and cover configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric contact surface is fixed in position during insertion, then the structure is simple, but the contact surface rubs against the terminal causing damage and poor contact reliability
Solution Approach 1:
The electric contact surface is made movable through a swingable lever mechanism, allowing it to dynamically adjust its position during insertion. The lever can swing between a first position (retracted) and a second position (extended), enabling the contact surface to move from a protected state to a contacting state, thereby eliminating rubbing while maintaining reliable contact.
2Reliability
If the electric contact surface retracts during insertion, then rubbing is reduced, but contact pressure may decrease leading to poor electrical connection
Solution Approach 1:
The lever is designed to swing to the second position before the housing is fully inserted, so that the electric contact surface is already in contact with the terminal. This preliminary action ensures that contact pressure is established in advance, preventing poor electrical connection while the housing is being inserted.
Solution Approach 2:
The electric contact surface is designed with a curved or spherical contact area that conforms to the terminal surface. This curvature allows for automatic alignment and maintains consistent contact pressure even during the insertion motion, ensuring reliable electrical connection without requiring high force.
3Reliability
If the lever swings to extend the contact surface, then contact reliability improves, but the mechanism becomes more complex
Solution Approach 1:
The lever is equipped with a return member that automatically returns the lever to the first position after the housing is inserted. This self-service mechanism eliminates the need for additional actuators or control systems, maintaining contact stability while minimizing mechanism complexity.
Solution Approach 2:
The lever mechanism is integrated with the housing structure, combining the support function and the swinging motion function into a single unified component. This merging reduces the number of separate parts and simplifies the overall mechanism while maintaining reliable contact stability.
Data Source
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AI summary
A developing cartridge includes a housing, a developing roller, a lever, and a storage medium. The housing may be configured to store a developing agent. The developing roller may be rotatable about a first axis extending in a first direction. The storage medium may be swingable together with the lever in a swing direction. The storage medium may have an electric contact surface. The electric contact surface may be swingable between a retreat position and an advance position. The electric contact surface may be positioned at the retreat position when the lever is positioned at a first position. The electric contact surface may be positioned at the advance position in a case where the lever is positioned at a second position. The housing may be movable in the second direction relative to the lever and the electric contact surface in a case where the electric contact surface is positioned at the advance position.