Hewlett-Packard Company

Wallace K Johnson

Michael B Lloyd

An electrophotographic laser printing process using dry low gloss toner formulations for producing either low gloss images or high gloss images. In an instance when a low gloss image is produced, the process selects a low gloss paper, and all other parameters of the process of printing low gloss images are consistent with known parameters for the production of electrophotographic low gloss images using dry toner formulations. In order to produce a high gloss image using a low gloss toner formulation, the method involves selecting a high gloss media, if available, from a media source and reducing the feed speed of the media through the process. Additionally, the fuser roller temperature is increased to ensure maximum fixing and fusing of the toner to produce a single voidless plane of toner on top of the media which exhibits a high reflective index and results in less light scattering at the surface of the toner.

Method and apparatus for forming high gloss images using low gloss toner

A liquid toner cartridge is provided with internal rotary agitation. The cartridge employs a magnetically-coupled drive, which requires no seals, to provide power to an internal pump and agitation system. The magnetically-coupled drive shaft falls in line with the pump and agitation device. Venting is through a single liquid supply/return line. When the line empties between pumping cycles, the cartridge can vent to the atmosphere. During pumping, a flexible tank, external to the liquid toner cartridge, partially collapses, but returns to original shape when toner has returned at the end of each development cycle. At this point, the supply/return line is again opened to the atmosphere for venting. This action always maintains space for the rotary agitation system.

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Boise, ID, United States of America

Wallace K Johnson