Ink Tank Evaporation Tracking via Time Stamping
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Solution Overview
Problem
Ink evaporation from ink tanks in inkjet printing devices can lead to damage when ink levels are not accurately monitored, especially in designs using foam or other mediums that hinder optical sensing, necessitating effective methods for determining remaining ink and evaporation rates.
Innovation Solution
A system and method that utilize a processor and ink evaporation estimation module to track removal and insertion times of ink tanks, estimate ink evaporation based on time differences, and account for environmental factors like temperature and humidity to determine remaining ink levels, incorporating date information storage and transmission between the ink tank and printing device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical sensing is used to detect free ink inside an ink tank, then ink level detection is possible, but it becomes inaccurate or impossible when foam or other mediums are used to retain ink
Solution Approach 1:
The patent replaces optical sensing with a mechanical dot-counting method. The print head mechanically attempts to print dots on the ink tank, and by counting how many dots are successfully formed versus how many are attempted, the system determines ink levels without relying on optical detection that fails with foam-based ink retention systems.
2Measurement precision
If ink tanks are removed from the printing device for extended periods, then the ink supply may evaporate substantially, but tracking and estimating evaporation accurately is difficult
Solution Approach 1:
The system performs preliminary actions by recording the removal time when an ink tank is taken from the printing device and the reinstallation time when it is returned. These time stamps are stored in memory, enabling subsequent calculation of the exact duration the ink tank was outside the device, which directly correlates to evaporation risk.
Solution Approach 2:
The system uses feedback by comparing the recorded removal and reinstallation times to calculate actual evaporation duration. This feedback loop allows the system to adjust ink level assessments based on the specific time the ink tank was exposed to environmental conditions, improving accuracy in determining whether sufficient ink remains for safe operation.
3Device complexity
If the ink tank is not monitored for evaporation, then the system is simpler, but damage to the printing device may result when empty tanks are reinstalled
Solution Approach 1:
Before allowing reinstallation of an ink tank, the system performs a preliminary check by comparing the recorded removal time with the current time to calculate evaporation duration. Based on this calculation, the system determines whether the ink tank has evaporated sufficiently to pose a risk, and only permits reinstallation if the tank is still safe to use, thus preventing device damage.
Data Source
AI summary
Some or all of the needs above can be addressed by embodiments of the invention. According to one embodiment of the invention, a method for determining ink evaporation from at least one ink tank can be provided. The method can include determining a removal time associated with removal of at least one ink tank from a printing device. The method can also include determining an insertion time associated with insertion of the at least one ink tank into a printing device. In addition, the method can include estimating an amount of ink evaporation from the at least one ink tank during the time between the removal time and insertion time based at least in part on the difference between the removal time and insertion time.