Method for increasing printhead reliability

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

Reexamination Certificate

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C347S017000, C347S099000

Reexamination Certificate

active

07992986

ABSTRACT:
A method of reducing intermittent weak or missing (IWM) jet failures in a phase change ink imaging device comprises fluidly connecting a positive pressure source to a print head assembly of a phase change ink imaging device. The print head assembly includes a plurality of ink jets for emitting ink drops onto an ink receiver. The method includes activating the pressure source to deliver a positive pressure pulse to the print head assembly. The pressure pulse is delivered at substantially a purge pressure. The pressure pulse has a pulse duration such that the pressure pulse bulges ink from the plurality of ink jets without emitting ink from the plurality of ink jets.

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patent: 7111917 (2006-09-01), Hill et al.
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patent: 7144100 (2006-12-01), Hill et al.
patent: 7188941 (2007-03-01), Platt et al.
patent: 7841692 (2010-11-01), Taga
patent: 2006/0209146 (2006-09-01), Reeves

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