Selectively firing a fluid circulation element

  • US 11,110,704 B2
  • Filed: 02/13/2020
  • Issued: 09/07/2021
  • Est. Priority Date: 04/29/2016
  • Status: Active Grant
First Claim
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1. A printing apparatus comprising:

  • a fluid ejection device including;

    first and second drop ejecting elements positioned inside fluid chambers,a fluid circulating element positioned inside the fluid chambers, wherein the fluid circulating element is to be fired to circulate a fluid inside the fluid chambers,a first pump generator to cause the fluid circulating element to be fired based on operations of the first drop ejecting element, anda second pump generator to cause the fluid circulating element to be fired based on operations of the second drop ejecting element, anda logic device connected to the fluid ejection device, wherein the logic device is to;

    in response to a determination that the first drop ejecting element has not been fired for a predetermined period of time, output a first instruction to instruct the first pump generator to fire the fluid circulating element, andin response to a determination that the second drop ejecting element has not been fired for the predetermined period of time, output a second instruction to instruct the second pump generator to fire the fluid circulating element,wherein the logic device is further to determine whether each of the first and second drop ejecting elements has been fired within the predetermined period of time in response to a determination that one of the first and second drop ejecting elements is to be imminently fired.

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