Developing Apparatus Shutter Locking Mechanism for Toner Leakage Prevention
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Solution Overview
Problem
Conventional developing apparatuses experience toner leakage due to gaps generated between the shutter and housing when the toner cartridge is rotated, as the locking member moves back to its original position, causing the shutter to press against the toner cartridge and housing, leading to potential toner leakage.
Innovation Solution
The developing apparatus incorporates a shutter, locking members, and a cover that allow smooth movement between open and closed positions, with the locking members moving from a lock to a release position when the toner cartridge is attached, and the cover preventing gaps between the shutter and housing, ensuring toner is not leaked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the locking member moves back to its original position when the toner cartridge is rotated, then the shutter can be locked securely when the toner cartridge is detached, but gaps are generated between the shutter and housing, causing toner leakage
Solution Approach 1:
A cover member is introduced as an intermediary component between the shutter and the housing. The cover member includes a pressing portion that presses the shutter against the housing to prevent gaps from forming. This mediator absorbs the harmful effect of the locking member's movement, maintaining the seal between the shutter and housing even when the locking member returns to its original position.
2Ease of operation
If the shutter is pressed against the toner cartridge and housing by the locking member, then the shutter can be locked in place, but gaps are generated between the shutter and housing, allowing toner to leak
Solution Approach 1:
The cover member acts as a mediator that provides an additional pressing force on the shutter. The pressing portion of the cover member presses the shutter in the opening/closing direction, ensuring that the shutter remains tightly sealed against the housing even when the locking member's pressing force is insufficient or when the locking member returns to its original position during cartridge rotation.
3Reliability
If the locking member locks the shutter at the closed position, then the shutter remains secure when the toner cartridge is detached, but the shutter cannot move smoothly when the toner cartridge is attached and rotated
Solution Approach 1:
The system transitions from a static locking mechanism to a dynamic one. The locking member can move between a lock position (when the toner cartridge is detached) and a release position (when the toner cartridge is attached). This dynamic behavior allows the shutter to be securely locked when needed while enabling smooth movement when the toner cartridge is attached and rotated.
Data Source
AI summary
In a developing apparatus, a housing has a first opening. A shutter is movable between an open position and a closed position. A locking member is movable between a lock position and a release position. The locking member is located between the housing and the shutter in a cartridge-attachment direction. The locking member is located at the lock position in a case where the toner cartridge is detached from the developing apparatus. The locking member is in contact with the toner cartridge, thereby moving from the lock position to the release position in a case where the toner cartridge is attached to the developing apparatus. A cover having a second opening that is in communication with the first opening in a state where the shutter is at the open position is located at an opposite side of the locking member with respect to the shutter in the cartridge-attachment direction.