Cover-Actuated Lock Lever for Developing Cartridge Replacement
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Solution Overview
Problem
In existing image forming apparatuses, users must demount the entire drum cartridge to replace the developing cartridge, which is inconvenient and prone to errors, as only the developing cartridge needs to be replaced.
Innovation Solution
An image forming apparatus design where a cover moves from a closed to an opened position to release the lock lever, allowing the developing cartridge to be demounted from the drum cartridge without manual lock release operation, using a mechanism involving an arm and slide rail to facilitate smooth lock release and re-locking with a torsion spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the entire drum cartridge is demounted to replace the developing cartridge, then the developing cartridge can be replaced, but the operation becomes inconvenient and time-consuming
Solution Approach 1:
The invention divides the drum cartridge assembly into separable components: the drum cartridge itself and the developing cartridge. The lock lever mechanism is designed to selectively lock only the developing cartridge to the drum cartridge, allowing the developing cartridge to be independently removed without demounting the entire drum cartridge from the housing.
Solution Approach 2:
The lock lever is extracted as a separate controllable element that can independently control the locking state of the developing cartridge. By operating the lock lever, users can selectively release the developing cartridge from the drum cartridge while the drum cartridge remains mounted in the housing.
2Ease of operation
If a manual lock release operation is required to demount the developing cartridge, then the developing cartridge can be replaced, but the operation complexity increases
Solution Approach 1:
The lock lever operation is merged with the existing cover opening/closing operation. The lock lever is positioned and configured to be automatically operated when the cover is opened, combining the cover opening action with the lock release action into a single user operation.
Solution Approach 2:
The lock lever mechanism is designed to automatically return to the locked position when the cover is closed, without requiring separate user intervention. The mechanism serves itself by using the cover movement to both release and re-lock the developing cartridge.
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
Enables easy and accurate replacement of the developing cartridge without requiring a separate lock release mechanism, improving user convenience and reducing the risk of mistakenly replacing the entire drum cartridge.
Implementation Method 1
a torsion spring configured to urge the lock lever toward the locked position
Data Source
AI summary
An image forming apparatus includes: a housing; a cover; a developing cartridge; and a drum cartridge including a drum frame, a photosensitive drum, a pressing member configured to press the developing roller to the photosensitive drum in a state where the developing cartridge is mounted to the drum frame, and a lock lever, the drum cartridge being mountable to an inside of the housing in a state where the developing cartridge is mounted to the drum cartridge, wherein in a state where the cover moves from the closed position to the opened position, the lock lever moves from a locked position at which the developing cartridge is prevented from being demounted from the drum frame to a non-locked position at which the developing cartridge is allowed to be demountable from the drum frame.