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Theory of Operation
2-17
The Process Drive:
An open loop system that transmits torque to two main
camshaft assemblies. One camshaft assembly controls the transfix roller loading, and
the other controls the drum maintenance system and printhead tilt system.
The Media Path Drive:
The
gearbox and motor assembly controls each roller in the
paper transport system. The paper transport system consists of a drive motor, a
gearbox assembly and three solenoids. The media path drive motor also controls the
movement of the wiper assembly and the headlock mechanism through a gear train
and solenoid on the exit module.
The Ink Loader:
Melts the solid ink as ink is required by the printhead. The melted
ink drops into the ink reservoirs of the printhead underneath the ink loader.
The Printhead:
inteRfaces with the electronics of the system to jet ink onto the
drum surface to create an image. The printhead includes 1236 interleaved jets (309 of
each primary color) to provide the ability to electronically turn off a weak or missing
jet to restore image quality.
The Drum Maintenance System:
Creates a thin intermediate liquid transfer
surface, a layer of silicone oil, on the surface of the drum prior to printing. The oil
keeps the ink from sticking to the drum’s surface and facilitates its transfer to the
sheet of paper or transparency film.
The Preheat and Deskew System:
Serves to ensure that the print media (paper,
envelope, or transparency film) aligns properly to the drum and that the media is
sufficiently warms to facilitate transfer of the image from the drum to the media.
The Drum Assembly and Transfix System:
Form the key portion of where
imaging takes place. The image is first printed as a "mirror" image on the rotating
drum. A sheet of warmed media feeds from the preheater and passes between the
drum and the transfix roller. The process gear train then loads the transfix system and
presses the paper to the drum to adhere the image as the drum spins in the transfix
direction.
The Exit Module or Media Exit Path (MEP):
Receives control signals from the
exit module (MEP) board, which contains its own firmware, for proper handling of
media exiting the IOT. The exit module takes transport control of the media, lifting it
from the area of the ink loader and delivering it to the output tray at the front of the
IOT.
The Purge System:
Uses air pressure and a wiper blade to remove any debris or air
bubbles that may be obstructing the printhead nozzles.
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