Patent ID: 11872819
Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B  G | IPC B

Claim 4:
5. A printing system to be fluidly connected to a printing fluid supply, the printing system comprising:
a fluid interconnect mechanism to be fluidly connected, on a first side, to a positive pressure pump associated to the printing fluid supply and, on a second side, to an element within the printing system;
a nozzle in the fluid interconnect mechanism, the nozzle comprising a nozzle inlet and nozzle outlet, the nozzle outlet including a member comprising a plurality of holes; and
a nozzle clogging detector, wherein the detector is to determine if the nozzle is clogged in view of a stroke period of the pump being greater than a threshold amount with respect to a reference stroke period;
an unclogging mechanism, wherein the fluid interconnect mechanism comprises an unclogging port and the unclogging mechanism comprises an air supply to inject an air burst through the unclogging port into the fluid interconnect mechanism, wherein the unclogging mechanism is to inject the air burst upon receipt of an unclogging trigger signal from a controller, wherein the air burst is injected between stroke periods of the pump, the burst not interfering with operation of the pump;
wherein the holes of the nozzle are structured to reduce a concentration of solid content in printing fluid of the printing fluid supply during transfer of the printing fluid under pressure from the pump from the printing fluid supply to the element by forcing the printing fluid through the plurality of holes of the member, such that a dispersed printing fluid is obtained downstream the member.