Developing Cartridge Recessed Grip and Boss Reinforcement Against Leakage
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Solution Overview
Problem
Conventional developing cartridges face difficulties in handling and deformation due to increased size and weight when accommodating larger toner amounts, leading to potential toner leakage.
Innovation Solution
A developing cartridge design with a recessed portion and bosses connecting opposing walls, allowing for larger toner capacity and easier handling, while suppressing deformation through finger insertion and boss support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the housing is enlarged in size to accommodate a larger amount of toner, then the toner capacity is improved, but the user encounters difficulty in grabbing the housing and the developing cartridge becomes heavier
Solution Approach 1:
The patent introduces a recessed portion on the side surface of the housing, creating a new dimensional feature for finger insertion. This allows users to grip the housing by inserting fingers into the recessed portion rather than trying to grasp the entire enlarged housing body, thus maintaining ease of operation while increasing toner capacity.
Solution Approach 2:
The recessed portion acts as an intermediary structure between the user's fingers and the housing. It provides a convenient gripping interface that mediates the interaction, allowing users to easily hold and replace the enlarged housing without direct grasping of the bulky toner container.
2Quantity of substance
If the developing cartridge becomes heavier due to larger toner amount, then the toner capacity is improved, but the user requires greater force to hold the housing and deformation becomes more prone
Solution Approach 1:
The housing is segmented into multiple functional components: the main housing body, the recessed portion for gripping, and the boss structure for reinforcement. The boss extends from one side wall to the other, creating internal structural segmentation that reinforces the housing against deformation while accommodating the increased weight of larger toner capacity.
Solution Approach 2:
The housing employs a composite structure combining the housing material with internal reinforcement elements (boss). This composite design allows the housing to withstand the increased weight and stress from larger toner amounts while maintaining structural integrity and resisting deformation.
3Quantity of substance
If the housing is enlarged to store more toner, then the toner capacity is improved, but the housing is more prone to deformation which may result in toner leakage
Solution Approach 1:
The housing structure is segmented with internal boss reinforcements that divide and strengthen the walls. This segmentation prevents overall deformation of the enlarged housing while maintaining seal integrity, thereby preventing toner leakage even when the housing is enlarged for larger toner capacity.
Solution Approach 2:
The boss structure provides beforehand reinforcement to the housing walls, preemptively counteracting the deformation risks associated with enlarged housing size. This prior structural cushioning prevents toner leakage by ensuring the housing maintains its shape and seal integrity under the weight of larger toner amounts.
Data Source
AI summary
A developing cartridge is attachable to a drawer that is movable in a first direction relative to a main housing of an image forming apparatus. The developing cartridge includes: a casing having a toner chamber; and a developing roller positioned at one end of the casing in a second direction and rotatable about an axis extending in a third direction. The casing includes: a recessed portion recessed from an outer surface of the casing toward the developing roller; a first wall extending in the second direction; and a first boss positioned inside the toner chamber. The recessed portion is positioned at a center in the third direction of another end of the casing in the second direction. The first wall and the second wall form the toner chamber. The first boss extends from the first wall to be connected to the second wall.