Developer Cartridge Lock Mechanism Preventing Toner Leakage
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Solution Overview
Problem
Existing image forming apparatuses face issues with toner leakage due to strong external impacts, which can lead to maintenance and operational challenges.
Innovation Solution
The design of a process cartridge and developer cartridge configuration that includes a lock device and urging mechanism to securely position the developer cartridge, preventing it from detaching and minimizing the risk of toner leakage, with features such as inverted triangular action-receiving portions and resilient components to absorb shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the developer cartridge is securely locked in the photosensitive member cartridge using a lock lever and action-receiving portion, then the reliability of preventing toner leakage is improved, but the device complexity increases due to additional locking components
Solution Approach 1:
The locking mechanism is divided into separate functional components: the lock lever with contact portion, the action-receiving portion with resilient member, and the inlet protection structure. This segmentation allows each component to perform its specific function independently while working together as a system, achieving reliable toner leakage prevention without requiring an overly complex integrated design.
Solution Approach 2:
The action-receiving portion includes a resilient member that is pre-configured to elastically deform and contact the contact portion of the lock lever. This preliminary action ensures that as the developer cartridge is inserted, the locking engagement occurs automatically through the pre-positioned resilient member, providing reliable locking without requiring additional actuation steps or complex control mechanisms.
2Ease of operation
If the inlet is exposed on the sidewall of the developer cartridge for toner supply, then the ease of operation for toner refilling is improved, but the risk of toner leakage due to external impact worsens
Solution Approach 1:
The protection wall is positioned specifically to overlap only the inlet region when the developer cartridge is mounted in the photosensitive member cartridge. This localized protection structure provides targeted shielding for the inlet area without obstructing the refilling operation, as the inlet remains accessible from the exposed sidewall while being protected from lateral impacts that could cause toner leakage.
Solution Approach 2:
The protection wall acts as a preliminary protective barrier that absorbs or deflects external impacts before they can reach the inlet. By positioning the protection wall to overlap the inlet in advance, the system prepares for potential impact events, cushioning the inlet structure against forces that would otherwise cause toner leakage while maintaining ease of refilling operation.
3Stability of the object's composition
If the lock lever contact portion is positioned to engage the action-receiving portion, then the stability of cartridge assembly is improved, but the difficulty of detecting and measuring proper engagement worsens
Solution Approach 1:
The lock lever or engagement components are designed with visual indicators that change appearance or position based on engagement status. This allows operators to easily detect whether the lock lever contact portion is properly engaged with the action-receiving portion, transforming the invisible mechanical engagement into a visible state that can be quickly assessed without complex measurement tools.
Data Source
AI summary
A photosensitive member cartridge, including a photosensitive member, is provided with a lock device and a protection wall for the lock device. A developer cartridge includes a developer containing chamber and an inlet. The inlet is disposed so that the protection wall for the lock device at least partially overlaps the inlet when the developer cartridge is received in the photosensitive member cartridge.