Xerox Corporation

At&t Teletype Corporation

Alan J Liebman

David B Durkee

An ink jet printer utilizing a smooth surfaced transfer drum is shown as an illustrative embodiment of the invention. The transfer drum and the print head assembly are mounted between a pair of side plates (only one of which is shown in the drawing). A print head assembly, which comprises a number of ink jet nozzles, is also mounted between the side plates. The print head assembly is spaced apart from the drum and the nozzles thereof are spaced at equal distances along a line which is parallel to the axis of the drum. The print head assembly is movable in fine steps from left to right so that on successive rotations of the drum each nozzle is directed to a new track of a succession of tracks. After all tracks of the transfer drum have been served by a nozzle assembly, a printing medium, e.g., paper is brought in rolling contact with the drum to transfer the indicia on the drum to the printing medium while the print head assembly is returned to its starting position; and thereafter, if required, the drum is wiped clean in preparation for receiving the next page of information.

Ink jet printer

This invention is directed to a process for charging magnetic toner particles contained in a xerographic developer composition, the developer composition being comprised of conductive magnetic carrier particles and substantially uncharged magnetic toner particles, said process comprising transporting by an electrode transporting member the magnetic toner particles into close proximity of the electrical potential existing in the region of an imaging bearing member of an electrophotographic, or electrographic imaging system containing a magnetic brush development device whereby charge of a polarity opposite to that of the electrical potential is induced into the toner particles, causing the toner particles to possess a resistivity of from about greater than 10.sup.15 ohms-cm to about less than about 10.sup.18 ohms-cm, the effective distance between said image bearing member and said electrode transporting member being from about 5 micrometers to about 100 micrometers. Developers containing such toner materials can be used to develop images in electrophotographic, or electrographic imaging systems.

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Skokie, IL, United States of America

Alan J Liebman