Abstract: A fluid ejection apparatus includes a plurality of fluid ejectors. Each fluid ejector includes a pumping chamber, and an actuator configured to cause fluid to be ejected from the pumping chamber. The fluid ejection apparatus includes a feed channel fluidically connected to each pumping chamber; and at least one compliant structure formed in a surface of the feed channel. The at least one compliant structure has a lower compliance than the surface of the feed channel.

Abstract: Techniques, systems, and computer program products that facilitate image printing. A technique may include receiving an image to be printed, using a first software component to selectively pre-process the image depending on a format of the image, and using a second software component to generate image queues from the pre-processed image. In that technique, each image queue includes at least one portion of image data associated with an association of print elements that corresponds to a configuration of print elements at a printing device. The technique may be implemented in a scalable system, by having multiple first software components and multiple second software components, where each of the first and/or second components can reside on a separate computer system.

Abstract: Among other things, for use in ink jetting, a method includes reducing an anticipated variation in a characteristic of ink drops being jetted from an ink jet assembly, the reducing comprising causing a voltage that is applied on a jetting assembly to respond to the anticipated variation.

Abstract: A high resolution ink jet printer includes a rotating drum and a pair of ink jet heads scanned along a substrate carried by the drum in a direction parallel to the axis of the drum. The heads are driven by a lead screw coupled to the drum drive shaft and a control unit controls the rate of drop ejection from the printheads at a rate corresponding to the rate of encoder signals received from an encoder coupled to the drum drive draft. One printhead receives and ejects drops of black, magenta, cyan and yellow high-density inks and the other printhead ejects drops of black, magenta and cyan low-density inks along with another ink which may be a different color or black ink of a different density. High resolution and high print quality are assured by accurate control of the distance between the drum support shaft and the drum surface and also between the drum support shaft and a carriage support rail on which the printhead is supported as it moves adjacent to the drum surface.