Drum Cartridge Spring Contact Mechanism
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Solution Overview
Problem
Existing drum cartridges fail to maintain secure contact between the developer cartridge's memory device terminal and the drum cartridge's contact terminal when no driving force is applied, leading to potential disconnection and operational issues.
Innovation Solution
Incorporating a spring mechanism in the drum cartridge to urge the first drum contact toward the electric contact, ensuring consistent contact with the developer cartridge's memory medium, even when no driving force is input, and utilizing a lock lever to secure the developer cartridge in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no spring mechanism is used to urge the first drum contact toward the electric contact, then the device complexity is reduced, but the contact reliability between terminals deteriorates when no driving force is applied
Solution Approach 1:
The spring mechanism pre-urges the first drum contact toward the electric contact before any driving force is applied. This preliminary action ensures that the contacts are already in a ready-to-connect state, eliminating the risk of poor contact when the developer cartridge is stationary or when no driving force is input.
Solution Approach 2:
The spring mechanism automatically maintains contact pressure without requiring external intervention or additional power. The elastic potential energy stored in the spring continuously pushes the first drum contact against the electric contact, creating a self-sustaining contact maintenance system that operates passively.
2Reliability
If a spring mechanism is added to urge the first drum contact toward the electric contact, then the contact reliability is improved, but the device complexity increases
Solution Approach 1:
The spring mechanism is localized to only the contact maintenance function. It is positioned specifically to urge the first drum contact toward the electric contact, without affecting other parts of the developer cartridge or drum cartridge assembly. This localized approach minimizes the overall device complexity while solving the specific contact reliability problem.
3Stability of the object's composition
If the first drum contact is held fixed without spring urging, then the device complexity is reduced, but the contact stability deteriorates when driving force varies
Solution Approach 1:
The spring mechanism transforms the fixed contact position into a dynamic system that can adapt to varying driving forces. When driving force increases, the spring compresses slightly, allowing the first drum contact to move backward. When driving force decreases or stops, the spring expands, pushing the contact forward. This dynamic adjustment maintains stable contact under all operating conditions.
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 configuration maintains secure contact between the terminals, ensuring reliable operation and preventing disconnection, while allowing smooth movement and locking of the developer cartridge when driving force is applied, enhancing the stability and usability of the process cartridge.
Implementation Method 1
a spring configured to urge the first drum contact toward the electric contact. In the state where the developer cartridge is locked to the drum frame, the first drum contact is pressed toward the electric contact by an urging force of the spring
Data Source
AI summary
A drum cartridge, to which a developer cartridge containing toner therein and including a memory medium with an electric contact is detachably attached, is provided. The drum cartridge includes a photosensitive drum; a drum frame to receive the developer cartridge; a lock lever configured to lock the developer cartridge to the drum frame; a first drum contact configured to be in contact with the electric contact in a state where the developer cartridge is locked to the drum frame; and a spring configured to urge the first drum contact toward the electric contact. In the state where the developer cartridge is locked to the drum frame, the first drum contact is pressed toward the electric contact by an urging force of the spring.