Print head sensing chamber circulation
First Claim
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1. An apparatus comprising:
- a print head having a fluid slot and a sensing chamber having a first port connected to the fluid slot and a second port;
a drop generator comprising a diaphragm and a piezoelectric member to deflect the diaphragm, the drop generator being fluidly coupled to the fluid slot to receive fluid from the fluid slot;
a fluid level sensor within the sensing chamber;
a circulation passage extending from the fluid slot and fluidly coupled to the second port; and
a fluid pump to circulate fluid through the circulation passage.
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Abstract
A print head has a fluid slot and a sensing chamber having a first port connected to the fluid slot and a second port. The sensing chamber contains an ink level sensor. A circulation passage extends from the fluid slot and is fluidly coupled to the second port. A fluid pump circulates fluid through the circulation passage.
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Citations
20 Claims
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1. An apparatus comprising:
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a print head having a fluid slot and a sensing chamber having a first port connected to the fluid slot and a second port; a drop generator comprising a diaphragm and a piezoelectric member to deflect the diaphragm, the drop generator being fluidly coupled to the fluid slot to receive fluid from the fluid slot; a fluid level sensor within the sensing chamber; a circulation passage extending from the fluid slot and fluidly coupled to the second port; and a fluid pump to circulate fluid through the circulation passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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sensing a fluid level within a sensing chamber of a print head; circulating fluid from a fluid slot of the print head into the sensing chamber through a first port and out of the sensing chamber back into the fluid slot through a second port; and selectively expelling fluid from within the sensing chamber through a sensor nozzle extending from the sensing chamber. - View Dependent Claims (13, 14, 15, 16)
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17. An apparatus comprises:
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a fluid ejection device having a fluid slot and a sensing chamber having a first port connected to the fluid slot and a second port; a circulation passage extending from the fluid slot and fluidly coupled to the second port; a row of nozzles; a row of drop generators fluidly coupled to the fluid slot to receive fluid from the fluid slot, wherein a first portion of the row of drop generators are to eject fluid through the row of nozzles and wherein a second portion of the row of drop generators is not associated with the row of nozzles and is to pump fluid through the circulation passage to the sensing chamber; and a fluid level sensor within the sensing chamber. - View Dependent Claims (18, 19, 20)
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Specification