Air purge system for an ink-jet printer

Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means

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Details

347 92, B41J 2175

Patent

active

058477349

ABSTRACT:
An ink jet printer having an air purge feature that eliminates air from an ink delivery pathway. The printer includes an ink jet pen body housing having a containment chamber for holding ink, and a printhead that draws ink by capillary action from the containment chamber into a firing chamber and expels ink droplets through orifices. A remote supply of ink provides ink directly to the containment chamber through a supply line that directly communicates with the containment chamber and pulls ink from the remote supply as ink in the pen is used during printing. The pen is initialized by introducing ink under pressure from the remote supply into the supply line until ink fills the supply line and entire containment chamber with ink. Air is vented out of the supply tube and containment chamber as ink fills them. In a disclosed embodiment, the remote supply of ink is provided with a main reservoir coupled to a variable volume chamber pump through a one-way valve that allows the flow of ink from the reservoir to the pump and prevents the flow of ink from the pump to the reservoir. When the ink supply is installed in a printer, a fluid communication is established between the pump and the printer. The pump provided with the ink supply can be actuated to supply ink under positive pressure from the reservoir to the printhead, thereby flushing air from the ink delivery pathway. The supply of ink is preferably lower than the ink jet pen to maintain a back pressure on ink in the pen and prevent drooling from the orifices.

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