Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Amir Ofir

Michel Assenheimer

Amiran Lavon

Vitaly Portnoy

Eric G Nelson

Albert Teishev

Seongsik Chang

Gil Bar-Haim

Sasi Moalem

Ilanit Mor

Dmitry Maister

Alina Grishman

A printing device includes a print blanket to transfer an ink image onto print media on an impression drum. Responsive to receiving a null cycle trigger during printing, the impression drum is repositioned to a null position to reduce contact between a print blanket and the impression drum.

Contact control of print blanket to impression drum

In an example, a method of wetting a print blanket includes receiving a null cycle trigger during a printing session. The method also includes maintaining printing voltages on a forecast BID (binary ink developer) that has been prepared to print a next color separation onto a photoreceptor, and applying wet null voltages to a non-forecast BID. The method then includes engaging the non-forecast BID with the photoreceptor to transfer fluid other than ink to the photoreceptor during the null cycle.

Wet null cycle printing

In an example, a method of controlling voltage applied to a print blanket within a printing device includes printing a print job. During the printing, a null cycle trigger is received. In response to the trigger, contact between a print blanket and an impression drum is reduced.

In one implementation, an image forming apparatus may include a photoconductive unit and a refresh unit. The photoconductive unit may include a photoconductive layer. The photoconductive layer may have a first polarity during a print routine. The refresh unit may apply a voltage to the photoconductive layer to electrically bias the photoconductive layer to have a second polarity during a refresh routine.

Photoconductive layer refresh

Described herein is a method for electrostatic printing including: (i) providing an ink composition having: a hydrocarbon carrier liquid and particles includes a resin and a colorant, and wherein the ink composition contains less than 0.3 mg of charge director per g of solids in the ink composition; (ii) adding a charge director to the ink composition, such that the total amount of charge director in the ink composition is at least 0.6 mg per g of solids in the ink composition, and, (iii) within a predetermined time of adding the charge director, printing the ink onto a print medium in an electrostatic printing process, wherein the predetermined time is 90 minutes or less.

Growing community of inventors

Nes Ziona, Israel

Amir Ofir