Liquid Cartridge Sub-Wall Configuration for Leakage Prevention
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Solution Overview
Problem
Existing ink cartridges face issues with ink leakage due to increased weight and rotational moment, and difficulty in removing small capacity cartridges from printers, especially when the rear wall position is misaligned, leading to visibility problems of the ink surface.
Innovation Solution
The design includes a liquid cartridge with a sub-front wall positioned closer to the front wall and a sub-bottom wall extending upward relative to the liquid supply portion, ensuring a stable connection between the ink needle and supply port, and aligning rear walls to facilitate easy removal and visibility of the ink surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the tank capacity is increased to store more ink, then the ink storage capacity is improved, but the ink cartridge weight increases and the rotational moment on the connecting part becomes larger, causing the ink needle to twist and creating gaps that lead to liquid leakage
Solution Approach 1:
The patent applies local quality by reinforcing specifically the connecting part between the ink needle and ink supply port with a strengthening rib structure. This localized reinforcement increases the rigidity of the connecting part without increasing the overall tank capacity, thereby preventing twisting and maintaining connection tightness while allowing large ink storage capacity.
2Quantity of substance
If the front-rear direction length from the rear wall to the ink supply port is increased to accommodate larger tanks, then the tank capacity is improved, but the rear wall position becomes misaligned, making small capacity cartridges difficult to remove and reducing visibility of the ink surface
Solution Approach 1:
The patent applies local quality by extending the rear wall selectively in specific regions while maintaining the overall alignment. This allows the tank capacity to be increased through extended storage spaces in certain areas, while the critical regions for cartridge removal and visibility maintain their original positions, ensuring ease of operation is not compromised.
3Quantity of substance
If the front-rear direction length from the front wall to the ink supply port is increased, then the tank capacity is improved, but the ink supply port position shifts, affecting the alignment with the ink needle and potentially causing liquid leakage
Solution Approach 1:
The patent applies local quality by maintaining the ink supply port at its original position while extending the tank capacity in other regions. The strengthening rib structure is positioned to reinforce the connecting part without interfering with the ink supply port alignment, thereby preserving manufacturing precision while allowing increased storage capacity.
Solution Approach 2:
The patent segments the tank structure into different functional zones: the ink supply port region maintains precise alignment for reliable connection, while other regions are extended to increase storage capacity. The strengthening rib acts as a separate structural element that reinforces the connecting part independently, allowing the system to achieve both large capacity and high precision alignment.
Data Source
AI summary
A liquid cartridge includes: a liquid chamber; a liquid supply portion having a front end part of a liquid supply hole; a front wall and a rear wall away from the front wall in a rearward direction; a bottom wall extending between the front and the rear walls; a sub front wall; and a sub bottom wall extending between the front wall and the sub front wall. The sub front wall faces frontward and is positioned closer to the front wall than to the rear wall. The sub bottom wall is positioned upward relative to the liquid supply portion. The front wall is positioned frontward relative to the front end part of the liquid supply hole. The front wall has a length in an upward direction longer than a length of the sub front wall in the upward direction in an upright posture.