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. (WO2018139986) PRINTING FLUID RECIRCULATION

Pub. No.:    WO/2018/139986    International Application No.:    PCT/US2017/014719
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Wed Jan 25 00:59:59 CET 2017
IPC: B41J 2/175
B41J 2/03
B41J 2/18
Applicants: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventors: BUTINYA, David
COMA VIVES, Marta
MIRAVET, Joan-Albert
Title: PRINTING FLUID RECIRCULATION
Abstract:
A printing device comprises a printing fluid supply; a plurality of printheads connected in parallel to the supply by a first flow path and a second flow path; a first fluid pressure source to create a negative fluid pressure between the supply and the first openings; a second fluid pressure source to create a positive fluid pressure between the supply and the second openings; and a controller. Each printhead comprises a closable first opening connected to the first flow path and a closable second opening connected to the second flow path, and has an associated mechanism to increase a fluid pressure in the printhead. Each first opening is to open in response to operation of the associated mechanism. The controller is to identify a first printhead for which printing fluid in the first printhead is to be recirculated; and operate the mechanism associated with the identified printhead.