Abstract: A fluid injection module may include a fluid ejection die, a die carrier, a bypass fluid passage in at least one pressure regulator. The fluid ejection die may include nozzle orifices on a front face of the die, first and second fluid passages extending through the die and a microchannel extending from the first fluid passage to the second fluid passage proximate the nozzle orifices to circulate fluid from the first fluid passage to the second fluid passage. Third and fourth fluid passages may extend through the die carrier. The bypass fluid passage may extend from the third fluid passage to the fourth fluid passage while being connected to the first fluid passage and the second fluid passage. The at least one pressure regulator is to induce pressure differential driven fluid flow across the microchannel and across the bypass fluid passage.

Abstract: A print module may include a printhead die. The printhead die may include a chamber layer having ink chambers and micro-channels formed in the chamber layer. The print module may further include a die carrier including manifold passages through which ink flows to and from the printhead die and dual pressure regulators to flow fluid through the micro-channels of the printhead die.

Abstract: A fluid injection module may include a fluid ejection die, a die carrier, a bypass fluid passage in at least one pressure regulator. The fluid ejection die may include nozzle orifices on a front face of the die, first and second fluid passages extending through the die and a microchannel extending from the first fluid passage to the second fluid passage proximate the nozzle orifices to circulate fluid from the first fluid passage to the second fluid passage. Third and fourth fluid passages may extend through the die carrier. The bypass fluid passage may extend from the third fluid passage to the fourth fluid passage while being connected to the first fluid passage and the second fluid passage. The at least one pressure regulator is to induce pressure differential driven fluid flow across the microchannel and across the bypass fluid passage.

Abstract: A print module includes a printhead die, an input regulator to regulate input fluid pressure to the die, and an output regulator to regulate output fluid pressure from the die. A method includes receiving fluid at an input regulator to a print module, creating a fluid pressure differential within the print module between the input regulator and an output regulator, flowing fluid from the input regulator through a printhead die and to an output regulator using the pressure differential, and drawing fluid from the output regulator.

Abstract: A print module may include a printhead die. The printhead die may include a chamber layer having ink chambers and micro-channels formed in the chamber layer. The print module may further include a die carrier including manifold passages through which ink flows to and from the printhead die and dual pressure regulators to flow fluid through the micro-channels of the printhead die.

Abstract: A print module includes a printhead die, an input regulator to regulate input fluid pressure to the die, and an output regulator to regulate output fluid pressure from the die. A method includes receiving fluid at an input regulator to a print module, creating a fluid pressure differential within the print module between the input regulator and an output regulator, flowing fluid from the input regulator through a printhead die and to an output regulator using the pressure differential, and drawing fluid from the output regulator.

Abstract: A print module includes a printhead die, an input regulator to regulate input fluid pressure to the die, and an output regulator to regulate output fluid pressure from the die. A method includes receiving fluid at an input regulator to a print module, creating a fluid pressure differential within the print module between the input regulator and an output regulator, flowing fluid from the input regulator through a printhead die and to an output regulator using the pressure differential, and drawing fluid from the output regulator.

Abstract: A piezoelectric inkjet die stack includes a circuit die stacked on a substrate die, a piezoelectric actuator die stacked on the circuit die, and a cap die stacked on the piezoelectric actuator die. Each die in succession from the circuit die to the cap die is narrower than the previous die.

Abstract: A piezoelectric inkjet die stack includes a circuit die stacked on a substrate die, a piezoelectric actuator die stacked on the circuit die, and a cap die stacked on the piezoelectric actuator die. Each die in succession from the circuit die to the cap die is narrower than the previous die.

Abstract: A fluid-ejection printhead die includes first fluid-ejection nozzles, second fluid-ejection nozzles, and a mixing barrier. The first fluid-ejection nozzles eject fluid of a first type, and are organized over a first row and a second row non-collinear to the first row. The second fluid-ejection nozzles eject fluid of a second type different than the first type, and are organized over a third row and a fourth row non-collinear to the third row. The fourth row is at least substantially collinear to the first row. The mixing barrier is at least substantially between the first row of the first fluid-ejection nozzles and the fourth row of the second fluid-ejection nozzles.

Abstract: A piezoelectric printhead trace layout includes an actuator die, bond pads along two side edges of the actuator die, rows of piezoceramic actuators between the two side edges, drive traces emanating from the bond pads toward the center of the actuator die, a ground bus extended along the center of the actuator die between two end edges of the actuator die, and ground traces emanating from the ground bus outward toward the two side edges.

Abstract: A print module includes a printhead die, an input regulator to regulate input fluid pressure to the die, and an output regulator to regulate output fluid pressure from the die. A method includes receiving fluid at an input regulator to a print module, creating a fluid pressure differential within the print module between the input regulator and an output regulator, flowing fluid from the input regulator through a printhead die and to an output regulator using the pressure differential, and drawing fluid from the output regulator.

Abstract: In one embodiment, an assembly includes: a print bar; first and second guide rods oriented parallel to one another; a first bracket slidable along the first guide rod and connected loosely to one end of the print bar; and a second bracket slidable along the second guide rod and connected loosely to the other end of the print bar. In another embodiment, a method includes: directly constraining a print bar in Z and theta Y at a first connection; indirectly constraining the print bar in theta Y at a second connection; and neutralizing the theta Y constraint at the second connection through a third connection between the first connection and the second connection.

Abstract: In one embodiment, an assembly includes a lift and a print bar mounted to the lift. The lift includes first and second guide rods oriented parallel to one another and perpendicular to an axis of the print bar across the print zone. The first end of the print bar is slidably connected to the first guide rod, the second end of the print bar is slidably connected to the second guide rod, and the lift is configured to simultaneously move both ends of the print bar along the guide rods. In another embodiment, an assembly includes a chassis and a lift supported by the chassis. The lift is configured to loosely hold a print bar and to raise and lower the print bar over a print zone such that both ends of the print bar move simultaneously.

Abstract: In one embodiment, a print bar structure includes a single part having: a datum; an exterior printhead attach surface a predetermined distance from the datum for attaching multiple printheads to the print bar structure; an interior bay for holding a liquid distribution part; and multiple openings from the interior bay to the exterior printhead attach surface.

Abstract: In one embodiment, an assembly includes: a print bar; first and second guide rods oriented parallel to one another; a first bracket slidable along the first guide rod and connected loosely to one end of the print bar; and a second bracket slidable along the second guide rod and connected loosely to the other end of the print bar. In another embodiment, a method includes: directly constraining a print bar in Z and theta Y at a first connection; indirectly constraining the print bar in theta Y at a second connection; and neutralizing the theta Y constraint at the second connection through a third connection between the first connection and the second connection.

Abstract: In one embodiment, an assembly includes a lift and a print bar mounted to the lift. The lift includes first and second guide rods oriented parallel to one another and perpendicular to an axis of the print bar across the print zone. The first end of the print bar is slidably connected to the first guide rod, the second end of the print bar is slidably connected to the second guide rod, and the lift is configured to simultaneously move both ends of the print bar along the guide rods. In another embodiment, an assembly includes a chassis and a lift supported by the chassis. The lift is configured to loosely hold a print bar and to raise and lower the print bar over a print zone such that both ends of the print bar move simultaneously.

Abstract: A fluid-ejection printhead die includes first fluid-ejection nozzles, second fluid-ejection nozzles, and a mixing barrier. The first fluid-ejection nozzles eject fluid of a first type, and are organized over a first row and a second row non-collinear to the first row. The second fluid-ejection nozzles eject fluid of a second type different than the first type, and are organized over a third row and a fourth row non-collinear to the third row. The fourth row is at least substantially collinear to the first row. The mixing barrier is at least substantially between the first row of the first fluid-ejection nozzles and the fourth row of the second fluid-ejection nozzles.

Abstract: In one embodiment, a print bar structure includes a single part having: a datum; an exterior printhead attach surface a predetermined distance from the datum for attaching multiple printheads to the print bar structure; an interior bay for holding a liquid distribution part; and multiple openings from the interior bay to the exterior printhead attach surface.

Abstract: Embodiments of an apparatus including a rolling contact bearing are disclosed.