| 摘要 |
A printhead depriming system, the system comprising: an ink reservoir; an ink chamber positioned below the ink reservoir, the ink chamber comprising an outlet port connected to an ink inlet of the printhead via an upstream ink line, an inlet port connected to the ink reservoir, and a float valve configured for closing the inlet port; and an air pump communicating with a headspace above the ink in the ink chamber, such that actuation of the air pump generates a negative pressure in the headspace and draws ink from the printhead into the ink chamber so as to de-prime the printhead, wherein an increased level of ink in the ink chamber during the de-priming causes concomitant shutting of the float valve and isolates the ink reservoir from the printhead.
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