Hewlett-packard Development Company, L.P.

Hewlett-packard Indigo B.v.

Ilan Frydman

Mark Sandler

Shai Lior

Doron Schlumm

Boaz Tagansky

Itzhak Ashkenazi

Danny Gerstenfeld

Yury Alioshin

Asaf Miron

David Levanon

A method and apparatus for re-circulating a carrier in a printer is disclosed. The re-circulating system comprises a controller, a print head, a variable speed fan coupled to an air passageway and a condenser. The controller determines a liquid amount of carrier to be place on a page during a print operation. The controller adjusts the variable speed fan dependent on the amount of liquid carrier determined to be placed onto the page.

Recirculation system

A marking agent concentration method includes concentrating the marking agent by removing at least some liquid carrier between particles without substantially removing retained liquid carrier within the particles and without substantially modifying the particle structure, which is supported by the retained liquid carrier. The concentrated marking agent is supplied to distributors or end users of liquid marking agent. A concentrated marking agent includes solid clumps of agglomerated particles and a liquid carrier retained within the particles' individual structure. The clumps exhibit a median size greater than 90 &#x3bc;m. The concentrated marking agent exhibiting a solids content of from 40 wt % to less than 90 wt %. A hard imaging method includes combining a concentrated marking agent with additional liquid carrier, applying a shear force, dispersing particles from clumps, forming a liquid marking agent, and forming a hard image using the liquid marking agent.

Marking agent concentration methods, marking agents, and hard imaging methods

A method is presented for automatically controlling the spacing between printer drums. The printer includes at least two print drums () whose parallel rotation leads to image transfer, either between the drums or onto a printed surface. First the pressure a signal indicative of the pressure between the two print drums is obtained by a measurement unit (), and then the gap between the drums is automatically adjusted in accordance with the indicator signal by a gap adjuster ().

Automatic adjustment of printer drum spacing

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Tel Aviv, Israel

Ilan Frydman