It uses a transfuser belt that contacts the master (drum). The belt takes the image transferred from the master and fuses it into the paper. That fused image can be archived unlike most xerographic processes. Its not completely without waste now that I think of it. (Been over 2 yrs). But the way it works is it generates black toner images every 200 pages or so to cover the belt and act as a magnet to clean the belt of dust and dirt and other stray particles when its not imaging. By way of a slotted hollow spiral roller that contacts the ttf (transfuse transfer) belt, the small amount of excess toner moves wicks from the hot surface to the "cooler" surface. The spiral roller has to be replaced once it fills since it holds 1500 black "pages". It does one every 200 pages for a total of around 300k and the intervals can be adjusted for a cleaner running machine.
for color: http://www.cambridgeprinters.co.uk/d.../copypress.pdf
b/w: http://www.win.tue.nl/oowi/modeling%.../project3.html
From Oce:
"Virtually all other copiers and printers in the market are based on the traditional xerographic process. Despite its wide usage, xerography has one great shortcoming to make a copy, the toner must 'jump' from the photoconductor to the paper via a powerful electrostatic charge.
This is a dubious jump. It results in less than perfect toner adhesion, as well as toner pollution in the machinen and on your copies. The electrostatic charge is also a source of ozone and which xerography lacks (fine lines for example). The Océ Copy Press actually "presses" the toner onto the paper with heat and pressure. The result is consistantly high quality for many throusands and thousands of impressions and a real offset like "look and feel".
Toner adhesion is also better, and contamination minimal." You get the idea.
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