Xerox COLORQUBE 8570, Service Manual, Page: 408 / 433

October 2012
8-18 ColorQube 8570/8870 Service Manual
System Drive
Revised, 3rd Revision - Xerox Internal Use Only Theory of Operation
Process Drive Assembly
The Process Drive is an open loop system that transmits torque to two Camshaft assemblies.
One Camshaft assembly, Transfix Camshaft, controls Transfix Roller loading. The second
Camshaft, Drum Maintenance Camshaft, controls the Drum Maintenance and Printhead Tilt
Systems. The Printhead is tilted during power down and warm-up to perform maintenance on it
and to put it in a position to save power in Power Saver mode.
A DC Servo Motor powers the Process Drive to rotate the gears to specific positions during the
printing process. The Process Drive is able to actuate each Camshaft system independently or
concurrently through the use of the Swing Arm in the gear train. Operation of the Transfix and
Drum Maintenance System is controlled by the rotational direction of the Motor.
Figure 2 Process Drive Assembly
When the process Motor rotates in one direction, the Swing Arm 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 subsystems to
self home during operation. If either the gearbox or cam gears is out of home during installa-
tion, the system does not function properly.
Figure 3 , Figure 4 , and Figure 5 illustrate the rota-
tion direction of the gears.
The Process Drive activates the Transfix Camshaft as the Transfix Camshaft continues to turn
after it is fully loaded.
Figure 3 Transfix Roller is loaded