Submersion Cap Stabilizing Ink in Printhead Nozzles
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Solution Overview
Problem
Inkjet printheads experience nozzle clogging during extended periods of inactivity, leading to reduced ink ejection, suboptimal printing quality, and potential irreversible damage due to ink drying, especially in certain colors like magenta.
Innovation Solution
A submersion cap device that stabilizes ink in nozzles using an ink stabilizing material, with a blocking structure that ensures the material enters the nozzles before the vent openings, preventing clogging and maintaining ink integrity during inactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inkjet printhead is left unused for extended periods, then printing operations are paused, but nozzle clogging occurs due to ink drying
Solution Approach 1:
The system performs a preliminary action by submerging the printhead in a cap containing ink stabilizing material before the extended inactivity period begins. This pre-treatment stabilizes the ink in the nozzles and prevents clogging during the subsequent idle period, allowing the printhead to be quickly resumed without extensive cleaning.
Solution Approach 2:
An intermediary substance (ink stabilizing material) is introduced between the ink supply and the environment. This stabilizing material acts as a mediator that prevents the ink from drying out during inactivity while maintaining nozzle functionality. The blocking structure ensures this intermediary material is delivered to the correct locations (nozzles before vent openings).
2Reliability
If purge and cleaning cycles are used to mitigate clogging, then some clogging is reduced, but clogging cannot be completely avoided and printhead damage may still occur
Solution Approach 1:
Instead of reacting to clogging after it occurs through purge cycles, the system applies preliminary anti-action by stabilizing the ink in the nozzles before clogging can occur. The ink stabilizing material prevents the harmful drying process from beginning in the first place, eliminating the need for corrective cleaning cycles and preventing irreversible damage.
3Stability of the object's composition
If ink stabilizing material is dispensed into the cap, then ink stability is improved, but the material must be controlled to enter nozzles before vent openings
Solution Approach 1:
The delivery path is segmented into two distinct routes: one leading to the nozzles and another to the vent openings. The blocking structure is positioned to selectively block the vent opening path while allowing the nozzle path to remain open. This segmentation ensures that ink stabilizing material is delivered to the nozzles first, stabilizing the ink before it can reach the vent openings.
Solution Approach 2:
The blocking structure is positioned in advance to prevent the ink stabilizing material from entering the vent openings before the nozzles are filled. This preliminary positioning ensures that the stabilizing material is delivered in the correct sequence (nozzles first, then vent openings after blocking is removed), maintaining ink stability without requiring complex real-time control.
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
Prevents nozzle clogging and ink drying, maintaining printhead integrity and extending its lifespan by ensuring ink stability and readiness for resumed printing.
Implementation Method 1
The ink control device is adapted to first draw the ink stabilizing material from the cap into the nozzles when the nozzles are submerged in the ink stabilizing material in the cap using, for example, vacuum force.
Implementation Method 2
The ink control device is adapted to allow gravity to act to force the ink into the ink supply structures
Data Source
AI summary
A cap is positioned to contact a printhead when the printhead is not ejecting liquid ink onto print media. A dispenser dispenses an ink stabilizing material into the cap. A blocking structure is positioned in the cap to contact vent openings of the inkjet printhead when the inkjet printhead is in the cap and is in a location to submerge the nozzles in the ink stabilizing material in the cap. An ink control device draws the ink stabilizing material into nozzles of the inkjet printhead when the vent openings are blocked by the blocking structure. The ink control device subsequently draws the ink stabilizing material into the vent openings when the vent openings are separated from the blocking structure.