Ink Tank Cap Linkage Synchronizes Valve Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bubbler-style ink tanks for inkjet printers face issues with ink flow due to gravity, leading to ink drool or flooding at the print head assembly when the ink supply is above the print head, as breaking the seal to fill the tank results in loss of negative backpressure.
Innovation Solution
A linkage system that synchronizes the cap and valve actuations of an ink tank, ensuring the valve is sealed before the external seal is broken, using a pre-loaded hinge and elastic band to maintain the cap in a closed position until manually opened, and a secondary seal mechanism to prevent ink flow during filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cap is opened to fill the ink tank, then the ink tank can be refilled, but the negative backpressure is lost causing ink drool or flooding
Solution Approach 1:
The sealing system is divided into two independent but coordinated components: an external cap seal and an internal valve seal. This segmentation allows the external cap to be opened for filling while the internal valve remains closed to maintain negative backpressure, preventing ink drool. The linkage mechanism ensures proper sequencing of seal activation.
Solution Approach 2:
The internal valve seal is activated in advance before the external cap seal is broken. When the cap begins to open, the linkage mechanism triggers the internal valve to close first, establishing the secondary seal that maintains negative backpressure. This preliminary action ensures ink flow control is established before external sealing is removed.
2Ease of operation
If a simple cap opening mechanism is used, then the device is simple to operate, but the valve cannot be synchronized with cap actuation
Solution Approach 1:
The cap opening action and valve actuation are merged into a single coordinated motion through the linkage mechanism. The effector on the cap assembly connects to the valve linkage, so that one motion (opening the cap) simultaneously triggers both the cap seal break and the internal valve seal activation, maintaining synchronization without requiring separate control mechanisms.
Solution Approach 2:
The linkage mechanism acts as an intermediary between the cap assembly and the internal valve. It translates the mechanical motion of cap opening into coordinated valve actuation, ensuring proper sequencing while isolating the complexity from the user interface. The effector and linkage components mediate the force and motion transfer between cap and valve.
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
This solution effectively maintains negative backpressure within the ink tank during filling, preventing ink drool and flooding at the print head assembly by ensuring the internal valve remains sealed until the external seal is fully opened.
Implementation Method 1
a pre-loaded hinge and elastic band to maintain the cap in a closed position until manually opened
Implementation Method 2
A linkage system that synchronizes the cap and valve actuations of an ink tank
Implementation Method 3
a sealed pinion and gear train, the sealed pinion being fixed to a second lever arm, the second lever arm being connected to a valve body
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
An example ink tank includes an ink tank and a cap assembly attached to the ink tank with a preloaded hinge. The hinge rotates the cap assembly from a closed position to an open position when the cap assembly is unlatched. The cap assembly includes a bung to seal the ink tank during a partial rotation of the cap assembly when the cap assembly is unlatched. The ink tank also includes spring-loaded linkage connected to a valve in the ink tank. An effector extending from the cap assembly engages the spring-loaded linkage when the cap assembly is latched and disengages from the spring-loaded linkage after the cap assembly is unlatched. The spring-loaded linkage opens the valve when engaged with the effector, and closes the valve when disengaged from the effector, while the bung maintains a tank seal until the internal valve is closed.