When a supply is stored, the heavier pigments settle on the bottom part of the supply. Due to that,
prior to installing a new ink supply, it is necessary to do a certain number of shakes to ensure that the
ink is properly mixed.
In some printers, a printhead receives a stream of printing fluid from an Intermediate Tank, which is
supplied with ink from a supply tank by an ink pump. Depending on the Intermediate Tank orientation,
the heavier pigments settle on the deposit.
If the ink is not properly mixed, there would be depleted and enriched ink inside the supply, which
could impact on the Image Quality, such as opacity consistency, Nozzle health, and potentially issues
with de‐cap and spray. Furthermore, could lead to a printhead failure due to filter clogging.
This invention describes a process to automatically redisperse the ink inside the Intermediate Tank by
agitating one or several metallic balls by the interaction of a magnetic field to prevent the ink settling
on the deposit. The routine is scheduled to be done when the printer is in Idle conditions and does
not impact on the printer functionality or the Ink Delivery System algorithms.
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INC, HP, "AUTOMATIC INK REDISPERSION IN THE INTERMEDIATE TANK BY USING MAGNETIC FIELDS", Technical Disclosure Commons, (October 04, 2021)