Printhead Air Channels for Ink Venting Reliability
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Solution Overview
Problem
In liquid dispensers, such as inkjet printers, a malfunctioning vent in detachable ink containers can prevent proper ink flow to the printhead assembly, leading to printing issues due to inadequate air reach to the ink chamber.
Innovation Solution
The integration of unique air channels in the printhead support structure near the ink inlet allows for alternative venting, ensuring the ink container is exposed to air even if the conventional vent is sealed or defective, thereby preventing vacuum formation and ensuring continuous ink supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vent on the ink container is used, then the ink chamber can be vented to the atmosphere, but the vent may malfunction if the user fails to remove the seal or if there is a defect in the vent
Solution Approach 1:
The patent introduces an intermediary air hole through the substrate and air channels in the support structure that mediates the venting function. Instead of relying solely on the user-operable vent on the container, the system provides an alternative pathway through the substrate air hole and support structure air channels, which automatically provide ventilation without requiring user action. This intermediary mechanism ensures venting reliability even when the primary vent fails.
2Loss of substance
If the container vent is sealed during storage and shipment, then evaporation is prevented, but the vent may not be functional when installed in the printhead assembly
Solution Approach 1:
The patent implements preliminary action by providing the air hole through the substrate and air channels in the support structure before installation. These features are pre-configured to provide an alternative venting pathway that becomes active automatically when the container is installed, eliminating the need for users to manually unseal or reconfigure the vent. The preliminary infrastructure ensures that even if the container vent remains sealed, ink flow is maintained through the pre-established alternative pathway.
3Adaptability or versatility
If multiple ink containers are used with different ink types, then color printing is enabled, but ink mixing could occur if air channels are shared
Solution Approach 1:
The patent applies segmentation by providing separate, unique air channels for each ink container in the support structure. Each air channel is dedicated to a specific container and ink type, physically isolating the air pathways to prevent cross-contamination. This segmented approach allows multiple ink types to be used simultaneously for color printing while eliminating the risk of ink mixing through shared air channels.
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 ensures reliable ink flow to the printhead assembly by providing an alternative venting mechanism, preventing ink starvation and maintaining printing functionality even if the container's vent is malfunctioning.
Implementation Method 1
Separate, unique air channels on the back side of the substrate connect each of the air holes to the atmosphere, thus venting the ink container to the atmosphere through the printhead support structure
Implementation Method 2
a liquid is held in a block of foam or other capillary material inside the container
Data Source
AI summary
A structure comprises inlets through which respective liquids are to be introduced and multiple unique vent paths each corresponding to one of the inlets.