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: An example method to reduce hydraulic cross talk within a print head, in which the provision of a cancellation signal to a first actuator, associated with a first nozzle, in accordance with the present disclosure is controlled to at least partially absorb a hydraulic pressure wave from a second nozzle, adjacent to the first nozzle, to reduce interference at the first nozzle, the provision of the cancellation signal being independent of the operation of the second nozzle.

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: An apparatus and method for use in printing an image in a multipass printing device, the method comprising obtaining information identifying two or more defective nozzles in a nozzle array, determining that a line of a printed image is associated with more than a first predetermined number of defective nozzles based on the obtained information identifying two or more defective nozzles and selected step sizes, and identifying adjusted step sizes such that no more than the first predetermined number of defective nozzles is associated with any line of the printed image.

Abstract: An apparatus and method for use in printing an image in a multipass printing device, the method comprising obtaining information identifying two or more defective nozzles in a nozzle array, determining that a line of a printed image is associated with more than a first predetermined number of defective nozzles based on the obtained information identifying two or more defective nozzles and selected step sizes, and identifying adjusted step sizes such that no more than the first predetermined number of defective nozzles is associated with any line of the printed image.

Abstract: A method of degassing ink in a printer having an ink storage tank containing a body of ink having an ink surface is described. The method comprises causing the body of ink to move in the storage tank, so as to increase the surface area of the ink surface in comparison with a flat ink surface that an equivalent stationary body of ink would have in the storage tank, and extracting gas from the ink body.

Abstract: A method of degassing ink in a printer having an ink storage tank containing a body of ink having an ink surface is described. The method comprises causing the body of ink to move in the storage tank, so as to increase the surface area of the ink surface in comparison with a flat ink surface that an equivalent stationary body of ink would have in the storage tank, and extracting gas from the ink body.