Browse Prior Art Database

Original Publication Date: 1985-Oct-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


The figure schematically illustrates a leakproof, low cost, compact, easily interchangeable, typical developer housing for use with electrostatographic reproducing apparatus having a liquid developer mechanism. The developer housing consists of a central hollow tube 10 with perforations 11 into which a supply of the liquid developer has been provided. The tube has an outer layer of a polyurethane foam 12 adjacent to and in compression contact with a patterned developer applicator roll 14 from which liquid developer may be supplied to an image on an electrostatographic imaging member. The hollow tube is filled with liquid developer and capped at each end. The perforations allow the developer to seep out and saturate the foam. The foam contains microscopic pores which form a capillary network in which the ink may be stored. The saturated foam is in contact with the patterned developer roll and upon rotation the area of the foam adjacent the developer roll is compressed and the liquid developer is released onto the patterns on the developer applicator roll. As the roller advances the compressed area is relaxed and the expanded area at the exit of the nip between the foam roller and the developer applicator roller will have partially empty capillary canals which will cause additional liquid developer to flow from the inner reservoir to fill the voids. The capillary action is described by