Abstract: Methods and apparatus to control a heater associated with a printing nozzle are disclosed. A method comprising controlling a heater associated with a printing nozzle to reduce a heat output of the heater based on a determination that the printing nozzle is outside a print area and printing an image on a substrate using other printing nozzles while the heat output of the heater is reduced.

Abstract: A printing system may comprise a page wide array printhead a capping station, and a number of modular caps comprising a housing to cover a nozzle array of a printhead and a cap coupler coupled to the housing to couple the cap to the nozzle array in which the modular caps are adapted to be coupled to and removed from the nozzle array of the printhead and stored in the capping station.

Abstract: A printer may comprise a printhead comprising a number of nozzles, an immiscible fluid applicator, and a processor to instruct the immiscible fluid applicator to apply immiscible fluid onto the surface of the printhead to cap the number of nozzles. A printer subassembly may comprise an immiscible fluid applicator to wipe a layer of immiscible fluid onto a surface of a printhead. A printer may comprise a page wide array printhead, an immiscible fluid applicator to wipe a layer of immiscible fluid over a printhead to cap nozzles over the width of the printhead, and a controller to instruct the printhead to print after the layer of immiscible fluid has been applied over the printhead so that ink ejects through the immiscible fluid while non-used nozzles remain capped by the immiscible fluid layer.

Abstract: The present disclosure provides a waste ink spittoon for a printhead service station. The spittoon defines a reservoir for a waste ink composition ejected from a printhead. The spittoon comprises a gelling agent for increasing the viscosity of the waste ink composition, whereby the gelling agent comprises a particulate mass of solid particles of the gelling agent.

Abstract: An ink aerosol filtration system includes an inlet, a filtration chamber communicated with the inlet and including at least one filter member, and an airflow source communicated with the filtration chamber to generate flow into the inlet, through the filtration chamber and through the at least one filter member, wherein the airflow source is controlled to maintain substantially constant pressure at the inlet.

Abstract: An ink aerosol filtration system includes an inlet, a filtration chamber communicated with the inlet and including at least one filter member, and an airflow source communicated with the filtration chamber to generate flow into the inlet, through the filtration chamber and through the at least one filter member, wherein the airflow source is controlled to maintain substantially constant pressure at the inlet.

Abstract: In one implementation, a substance removal apparatus may include a collection unit and a removal unit. The collection unit may have a structure forming a channel and an inlet to receive an exhaust from a print system. The removal unit may separate a substance from the exhaust and transfer heat from the exhaust to the print system. The removal unit may include a heat exchanger and an impaction mechanism.

Abstract: A printing apparatus includes a carriage, a first detector module, and a second detector module. The carriage may selectively move a fluid applicator along a scanning path in a first scanning direction and a second scanning direction across a print zone to print on a media therein. The first detector module and second detector module may be coupled to the carriage. Further, the first detector module may include a first receiver and a first source to form a first detection region there between downstream of the carriage in the first scanning direction to detect an object therein. The second detector module may include a second receiver and a second source to form a second detection region there between downstream of the carriage in the second scanning direction to detect an object therein.

Abstract: In one implementation, a substance removal apparatus may include a collection unit and a removal unit. The collection unit may have a structure forming a channel and an inlet to receive an exhaust from a print system. The removal unit may separate a substance from the exhaust and transfer heat from the exhaust to the print system. The removal unit may include a heat exchanger and an impaction mechanism.

Abstract: In one example, an air barrier system for a printhead assembly includes a source of pressurized air and multiple channels operatively connected to the air source to channel multiple streams of air between two printheads in the printhead assembly.

Abstract: In one example, an air barrier system for a printhead assembly includes a source of pressurized air and multiple channels operatively connected to the air source to channel multiple streams of air between two printheads in the printhead assembly.

Abstract: In one embodiment, a servicing article comprises a web comprising a first material impregnated with a servicing fluid, the servicing fluid including a solvent that does not evaporate at ambient printer conditions, and a plurality of physical barriers within the first material, extending approximately across the first material's width, to restrict servicing fluid migration lengthwise along the web.

Abstract: Ink separators are described herein. One example ink separator is described, which includes an ink receptacle to receive ink aerosol particles, a surface within the ink receptacle to change a direction of an airflow entraining the ink aerosol particles and cause at least a portion of the ink aerosol particles to combine to form ink droplets on the surface, and a chamber adjacent the surface to receive the airflow including the ink droplets and at least some of the ink aerosol particles, wherein the chamber includes at least two flow paths to separate the airflow and the ink aerosol particles from the ink droplets by directing the airflow and the ink aerosol particles to an aerosol collection port and the ink droplets to an ink droplet collection port.

Abstract: A system for monitoring ink flow is disclosed. In one embodiment, the system includes a printhead configured to perform a priming event, a heating element, a sensor configured to measure the temperature of a printhead die at a plurality of times, and a processor configured to determine the success of a priming event by comparing an actual cooling rate to a threshold cooling rate.

Abstract: Ink separators are described herein. One example ink separator is described, which includes an ink receptacle to receive ink aerosol particles, a surface within the ink receptacle to change a direction of an airflow entraining the ink aerosol particles and cause at least a portion of the ink aerosol particles to combine to form ink droplets on the surface, and a chamber adjacent the surface to receive the airflow including the ink droplets and at least some of the ink aerosol particles, wherein the chamber includes at least two flow paths to separate the airflow and the ink aerosol particles from the ink droplets by directing the airflow and the ink aerosol particles to an aerosol collection port and the ink droplets to an ink droplet collection port.

Abstract: In one embodiment, a servicing article comprises a web comprising a first material impregnated with a servicing fluid, the servicing fluid including a solvent that does not evaporate at ambient printer conditions, and a plurality of physical barriers within the first material, extending approximately across the first material's width, to restrict servicing fluid migration lengthwise along the web.

Abstract: A system for monitoring ink flow is disclosed. In one embodiment, the system includes a printhead configured to perform a priming event, a heating element, a sensor configured to measure the temperature of a printhead die at a plurality of times, and a processor configured to determine the success of a priming event by comparing an actual cooling rate to a threshold cooling rate.

Abstract: An air pressurization system is incorporated as part of a replaceable auxiliary ink supply for an inkjet printer. The auxiliary ink-supply cartridge includes a pressurized container having air, ink and electrical-signal connections. The air pressure applied to the auxiliary ink supply is monitored to maintain it in a predetermined range in accordance with a start-up sequence, and operational sequence, a waiting time, and a close-down sequence.

Abstract: An air pressurization system is incorporated as part of a replaceable auxiliary ink supply for an inkjet printer The auxiliary ink supply cartridge includes a pressurized container having air, ink and electrical signal connections. The air pressure applied to the auxiliary ink supply is monitored to be maintained in a predetermined range in accordance with a start-up sequence, an operational sequence, a waiting time, and a close-down sequence.

Abstract: An air pressurization system is incorporated as part of a replaceable auxiliary ink supply for an ink jet printer. The auxiliary ink supply cartridge includes a pressurized container having air, ink and electrical signal connections. The air pressure applied to the auxiliary ink supply is monitored to be maintained in a predetermined range in accordance with a start-up sequence, an operational sequence, a waiting time, and a close-down sequence.