CPC B41J 2/18 (2013.01) [B41J 2/175 (2013.01); B41J 2/1707 (2013.01)] | 14 Claims |
1. A printing device comprising:
a printhead comprising a first port connected to a first flow path and a second port connected to a second flow path;
a first fluid pump to selectively create a negative fluid pressure between one of one or more printing fluid supplies and a first one of said first and second ports of said printhead;
a second fluid pump to selectively create a positive fluid pressure between one of said printing fluid supplies and a second one of the first and second ports of the printhead;
first and second regulators having first and second priming pumps and first and second regulator bags associated with the first and second ports of the printhead, wherein the second priming pump is configured to inflate the second regulator bag; and
a controller coupled to the second priming pump, wherein the controller is configured to perform a pulsed priming operation by providing pulsed signals to the second priming pump for a recirculation cycle time period to repeatedly inflate the second regulator bag to keep the second port of the printhead open over a threshold open position such that printing fluid within the printhead exits the printhead through the second port.
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