Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means
Reexamination Certificate
2011-01-25
2011-01-25
Le, Uyen-Chau N (Department: 2874)
Incremental printing of symbolic information
Ink jet
Fluid or fluid source handling means
C347S085000, C347S089000
Reexamination Certificate
active
07874662
ABSTRACT:
A method of replacing a printhead in an inkjet printer with minimal ink wastage, the method comprising the steps of:(i) providing a printhead comprising:an ink distribution manifold having an ink inlet and an ink outlet;one or more printhead integrated circuits mounted on the manifold, each printhead integrated circuit comprising a plurality of nozzles;(ii) providing an ink supply system comprising:an ink chamber in fluid communication with the ink inlet via an upstream ink line;a reversible air pump communicating with a headspace of the ink chamber; anda downstream ink line connected to the ink outlet;(ii) actuating the pump so as to negatively pressurize the headspace, thereby depriming the printhead by drawing ink from the downstream ink line and the printhead into the ink chamber;(iii) deactuating the pump and allowing an ink level in the ink chamber to equalize with an ink level in the upstream ink line;(iv) removing the printhead from the printer, the removing including disconnecting the ink inlet and the ink outlet from respective upstream and downstream ink lines;(v) replacing the printhead with a replacement printhead, the replacing including connecting an ink inlet and an outlet inlet of the replacement printhead with respective upstream and downstream ink lines;(vi) actuating the pump so as to positively pressurize the headspace, thereby priming the printhead by drawing ink from the ink chamber, through the printhead and into the downstream ink line; and(vii) deactuating the pump and allowing an ink level in the ink chamber to equilibrate to a predetermined level.
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Low David Jeremy
Silverbrook Kia
Le Uyen-Chau N
Prince Kajli
Silverbrook Research Pty Ltd
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