Hp Indigo B.v.

Meir Grinstein

Asaf Shoshani

Lavi Cohen

Evgeny Korol

Ido Finkelman

Andre Garcia

Maty Verner

Avinoam Halpern

Amit Porat

Alon Froom

Harsh Pranav Desai

Melissa Marie Lovell

Sharon Elbaz

Measures for controlling an engagement force between a photo imaging plate and a developer roller in a printing device are described. A motor is operated to generate rotational motion. The rotational motion is translated into linear motion. The linear motion causes an adjustment to the engagement force between the developer roller and the photo imaging plate. A characteristic of the motor is monitored. The motor is controlled on the basis of the monitored characteristic in order to maintain a desired engagement force between the developer roller and the photo imaging plate.

Controlling engagement force

In one example, a development cycle of a binary ink developer, BID, is timed. Timing may be based on the length of a substrate in which the image is to be printed or the size of the image or the area to be printed with the ink associated to the BID.

Ink development

In one example, a method for drying a developer unit of a liquid electrophotographic printer. After printing is complete, development voltage biases are applied to the developer unit while a liquid marking agent flows to the developer unit. The liquid marking agent flow to the developer unit is stopped. Drying voltage biases, lower than the development voltage biases, are applied to the developer unit. Idle voltage biases are applied to the developer unit when dry.

Developer unit drying

In an example, a method includes charging a photoconductive surface in a print apparatus and monitoring an electrical parameter associated with a proximity of a print apparatus component to the photoconductive surface. A relative spacing between the print apparatus component and the photoconductive surface may be changed and a contact between the print apparatus component and the photoconductive surface may be detected when the electrical parameter meets predetermined criteria.

Detecting contact between print apparatus components and photoconductive surfaces

Measures for controlling an engagement force between a photo imaging plate () and a developer roller () in a printing device () are described. A motor () is operated to generate rotational motion. The rotational motion is translated into linear motion. The linear motion causes an adjustment to the engagement force between the developer roller and the photo imaging plate. A characteristic of the motor is monitored. The motor is controlled on the basis of the monitored characteristic in order to maintain a desired engagement force between the developer roller and the photo imaging plate.

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Ness Ziona, Israel

Meir Grinstein