Patent ID: 7823996

Claim:
In an apparatus for printing images on a moving primary imaging member, which is rotating in a direction at a process speed, by jetting ink, containing an electrically resistive non-aqueous fluid and marking particles, in an image-wise fashion onto said primary imaging member, so that there is no electrostatic charge to attract marking particles to specific sites on the primary imaging member, a device for concentrating said ink prior to transferring a marking particle image to a receiver member, said ink concentrating device comprising: a fractionating unit comprising an electrically biased roller rotating counter to said direction at a different process speed, located a spaced distance of less than 250 microns from the primary imaging member for separating said electrically resistive non-aqueous fluid of said ink from said marking particles, said fractionating unit having a predetermined location relative to said primary imaging member; and means for establishing an electrostatic field between said primary image bearing member and said fractionating unit for concentrating said marking particles in said liquid of said ink using said electrically biased roller; wherein there is no photoreceptive element on the primary imaging member.