Hewlett-packard Industrial Printing Ltd.

Hewlett-packard Development Company, L.p.

Hp Scitex Ltd.

Dennis Indorsky

Gil Fisher

Ran Vilk

Semion Gengrinovich

Oren Perets

Lev Superfin

Arnon Gani

Yuval Eckstein

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.

Movement of fluid within printhead channels

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.

Printing method and apparatus

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.

Degassing ink in digital printers

Growing community of inventors

Netanya, Israel

Dennis Indorsky