2-4 Phaser 8400/8500/8550 Color Printer
Process Drive
The process drive is 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. A small DC
servomotor powers the process drive gearbox to rotate the gears to specific positions
during the printing process. The process drive is able to actuate each camshaft system
independently through the use of the swing arm in the gear train.
The rotational direction of the motor controls the operation of the transfix and drum
maintenance system. When the process motor rotates in one direction, the swing gear
engages the lower gears. When the motor rotates in the opposite direction, the upper
gears are engaged.
Since the system is open loop, special attention to the home position of the process
drive gears and the mating camshaft gears is critical. The process drive gearbox is
mechanically keyed upon installation via gear orientations. These gear orientations
allow the printer subsystems to self-home during operation. If either the gearbox or
cam gears is out of home during installation, the printer does not function properly.
s8500-009
Process drive Swing gear
Process
Motor
Gear
Process
Motor Gear
Transfix
Camshaft
Imaging Transfix
Drum Maintenance
Drum
Maintenance
Camshaft
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