Abstract: A photo-curable ink composition including UV curable polyurethane dispersions, water, photo-initiator, colorant and hydrophobic radiation-curable monomers. Also disclosed herein is a method for forming a printed article and an inkjet printing system using said photo-curable ink composition.

Abstract: Pallet conveyors for printers are disclosed. In example implementations a pallet conveyor for a printer comprises a track, a train pallet to circulate on the track and a wagon pallet to circulate on the track towed by the train pallet. The train and wagon pallets may support a print substrate.

Abstract: A printhead assembly includes a printbar beam member, a printhead, and a first eccentric pin. The printbar beam member includes a beam surface and a first cavity disposed through the beam surface. The printhead includes a printhead surface and a second cavity disposed through the printhead surface. The first eccentric pin may be inserted into the first cavity and the second cavity to couple the printhead to the printbar beam member. The first eccentric pin may rotate to adjust a position of the printhead relative to the printbar beam member along a first axis along the beam surface.

Abstract: A method of generating a printable image from a base image includes identifying parameters of a printer on which the printable image is to be printed, and creating a bit map image from a plurality of sub-cells, the identified parameters, and the base image.

Abstract: A printhead maintenance device includes a maintenance housing including a set of maintenance nozzles, an air controlling member, and a waste collector. The maintenance housing moves to selectively position the set of maintenance nozzles opposite a printhead including a nozzle surface having a plurality of nozzles to eject fluid. The set of maintenance nozzles provide fluid onto the nozzle surface of the printhead to remove residue therefrom. The air controlling member forms air flow paths to at least one of direct the fluid provided by the maintenance nozzles at an angle to the nozzle surface and direct the residue maintenance nozzles to the waste collector.

Abstract: A LED illumination source may include one or a plurality of LED illumination modules, each LED illumination module comprising a plurality of LED clusters, wherein each LED cluster comprises a LED array which is rotated by an angle of rotation with respect to an axis which is parallel to a predefined direction of sweep.

Abstract: Pallet conveyors for printers are disclosed. In example implementations a pallet conveyor for a printer comprises a track, a train pallet to circulate on the track and a wagon pallet to circulate on the track towed by the train pallet. The train and wagon pallets may support a print substrate.

Abstract: An ink-jet printing system (10) includes a generator (20) for in situ generation of a component of an inert atmosphere (an atmosphere that is depleted of oxygen). The system also includes a curing zone (16) in which the generated component (for example nitrogen or carbon dioxide) is distributable over ink that had been deposited on a substrate (12), and in which the ink is exposable to a curing agent (for example UV radiation).

Abstract: Printing apparatus comprise a printing table, a loader to load sheets of print media to the printing table, and a moveable tray on which at least one row of media sheets can be placed, the tray being moveable between a position in which it is accessible to an operator for placing media sheets thereon and another position in which at least part of the tray is accessible to the loader for picking the print media sheets but inaccessible to the operator.

Abstract: A printhead assembly, a printhead alignment tool usable with a printhead assembly, and a method of aligning a misaligned printhead are disclosed. The printhead assembly includes a printhead disposed on a printbar beam member. A position of the printhead may be adjusted relative to a printbar beam member.

Abstract: According to one example of the present invention there is provided apparatus for generating control data to control an ink jet printer to print a double-sided image on a single side of a substantially transparent substrate. The apparatus comprises a processor for receiving image data of a first and a second image, a printhead control data generator to generate, from the first image, first image printhead control data, and to generate, from the second image, second image printhead control data, and a covering layer printhead control data generator to generate covering layer printhead control data.

Abstract: According to one example of the present invention, there is provided a method of generating data to control the ejection of ink drops from a plurality of arrays of printhead nozzles of a printing system. In the printing system one of the arrays of nozzles is configured to eject a first ink of a first color having a first colorant density. Another one of the arrays of nozzles is configured to eject a second ink of the first color having a second colorant density. Each array of nozzles is capable of making ink marks having a plurality of different ink mark volumes on a media. The method comprises obtaining image data for a single color channel and generating, from the image data, multi-level screen data describing, for each of the first and second inks, the ink mark volume to be made by the array of printhead nozzles at each screen location.

Abstract: A vacuum hole array including a dense array of vacuum holes and a sparse array of vacuum holes.

Abstract: A pallet conveyor includes a conveyor track to guide pallets, and a service station deployed on the conveyor track, the service station to perform a service operation in the pallet conveyor.

Abstract: According to one example there is provided apparatus for curing ink on a substrate. The apparatus comprises a substrate support, a curing sheet positionable above the substrate support to create a gap between a substrate on the substrate support and the curing sheet. The apparatus further comprises an oxygen-depletion mechanism for reducing the oxygen level in the gap and an ultra-violet, UV, radiation source to apply UV radiation through the curing sheet to a substrate on the substrate support.

Abstract: A mill base composition includes a compound comprising a divinyl ester of a dicarboxylic acid, a dispersing agent, and a pigment. The divinyl ester of the carboxylic acid includes from 2 to about 8 carbon atoms. The mill base composition is subjected to milling with milling beads to produce a milled mill base composition that functions as a pigment concentrate that may be added to an ink vehicle to form an ink composition suitable for use in inkjet ink devices. The milled mill base composition is particularly suited for UV curable ink compositions. A UV curable ink composition includes the pigment concentrate, one or more UV curable monomers, and one or more UV initiators.

Abstract: In one embodiment, an actuator connected to a printhead structure is activated with a waveform to cause vibration of the structure sufficient to move fluid within a printhead channel adjacent to the structure and not cause the fluid to eject from the channel during a nonprinting period. In another embodiment, a first pulse module applies a pulse at a printhead structure at a combination of voltage, duration, and frequency to cause shaking of printhead structure to move fluid within a printhead channel adjacent to the structure without ejecting the fluid from the channel during a nonprinting period. In another embodiment, an actuator connected to a printhead structure is activated during a nonprinting period to pulse the structure to move fluid within a printhead channel adjacent to the structure without causing the fluid to be expelled from the channel.

Abstract: Abstract: An ink-jet printing system (10) includes a generator (20) for in situ generation of a component of an inert atmosphere (an atmosphere that is depleted of oxygen). The system also includes a curing zone (16) in which the generated component (for example nitrogen or carbon dioxide) is distributable over ink that had been deposited on a substrate (12), and in which the ink is exposable to a curing agent (for example UV radiation).

Abstract: A fluid applicator mounting device includes a main body to removeably receive a fluid applicator module. The main body includes a common fluid channel having a main input port, a main output port, a supplemental input port to provide fluid to the fluid applicator module, and a supplemental output port to output fluid from the fluid applicator module. The fluid applicator mounting device also includes an input fm member disposed inside the common fluid channel and arranged proximate to the supplemental input port to guide fluid to the fluid applicator module. The fluid applicator mounting device also includes an output fin member disposed inside the common fluid channel and arranged proximate to the supplemental output port to guide fluid from the fluid applicator module away from the supplemental output port.

Abstract: Print arrangement, comprising a first roll, a transport surface, a nip between the first roll and the transport surface through which, at least during printing, a substrate is threaded, a drive system arranged to change a width of the nip, and a lateral stretch member arranged to engage a side of the substrate. The first roll comprises a two coaxially aligned roll segments of similar diameters for rolling over the substrate, with a distance in between.