Controlling recirculating of nozzles
AssigneeHewlett-Packard Development Company, L.P.
InventorsEric Martin, Vincent C Korthuis
Life of this patent
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Abstract
In some examples, a fluid ejection device includes a nozzle to dispense fluid, and a recirculation controller to control recirculating of the nozzle. The recirculation controller is to receive, from a fluid ejection controller, an indication corresponding to a start of a sampling time interval, determine, during the sampling time interval, whether a firing event corresponding to firing of the nozzle has occurred, and in response to determining that the firing event has not occurred, cause activation of a recirculation pump to recirculate fluid through a chamber of the nozzle.
Claims18
A fluid ejection device die assembly comprising:
- a plurality of nozzles and corresponding firing chambers;
- a plurality of memory elements to enable tracking of nozzle firing events;
- and
- a recirculation controller to initiate performance of recirculation of the plurality of nozzles in response to local determinations of firing events of the plurality of nozzles based on values of the plurality of memory elements.
A fluid ejection device comprising:
- nozzles and corresponding firing chambers;
- an electrical interface to enable communication of messages, via a communications link, with a fluid ejection controller;
- and
- a recirculation controller to:
- start a sampling time interval based on a first indication in a message received from the fluid ejection controller;
- determine whether a firing event corresponding to the nozzles has occurred;
- and
- perform recirculation of the nozzles in response to reception of a second indication from the fluid ejection controller and a determination that a firing event has not occurred.
A method of recirculating nozzle of a fluid ejection device die, the method comprising:
- determining locally, by a controller of the fluid ejection device die, that a nozzle of a plurality of nozzles has not fired within a sample period;
- and
- triggering, by the controller, recirculation of the nozzle in response to the determining.
Dependencies are inferred from the claim text.