Xerox ColorQube 9303 Series, Руководство по обслуживанию

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February 2013
8-78 ColorQube® 9303 Family
Principles of Operation
Figure 29 . Cleaning unit processing
Figure 29 Cleaning unit management
Cleaning unit Components
The cleaning unit comprises the following components:
• Oil roller
• Metering blade
• Cleaning unit drive motor
• Solenoid valve
• Sump pump
• Delivery pump
• Oil return
Oil Roller
The oil supply roller is loaded with oil that is applied to the drum when the roll is moved into
contact with the drum surface. It is made from a continuous web wrapped into a roll and then
loaded with oil. The amount of oil applied to the drum is dependent on the penetration of the
roll into the drum surface and the amount of oil left in the roll. The rate of oil migration through
the roll is another factor in determining the oil applied to the drum surface.
Metering Blade
The metering blade meters the oil applied to the drum by the roller. The blade is spring loaded
against the drum. The amount of blade force on the drum determines the oil rate. In addition,
the roughness of the drum, as well as the edge condition of the blade have an affect on the oil
rate. The metering blade is required to clean any ink that has not been transferred to paper off
of the drum.
Cleaning Unit Drive
The roll and blade are driven into engagement with the drum via a stepper motor and the
cleaning unit camshaft,
Figure 31 . The camshaft supports two sets of cams for independently
actuating the roller and blade assembly. The stepper motor must be able to move fast enough
to disengage the cleaning unit in sufficiently short time so as to minimize the size of the oil bar.
In addition, the timing between the two sets of cams are such that the roller touches the drum
after the blade has been dropped and leaves the drum before the blade has been lifted. This
order of disengagement minimizes the size of the oil bar. The motor that drives the cleaning
unit engagement is a 1.8 degree stepper motor. This motor is operated at 8 microsteps per nat-
ural motor step. The resistance of the motor is 1.8 ohms and the current necessary to drive the
motor is 3 amps.
Oil Return
Figure 30 . The return oil wick is used to recirculate the oil that is metered off of the drum by the
blade back into the roll to be reapplied to the drum. The oil rate through this wick must be
greater than the amount of oil metered off the drum by the metering blade. The gel shield pre-
vents the gel (oil and ink mixture) that is removed from the drum by the metering blade from
contaminating the oil roller. The shield directs the gel away from the roll and accumulates the
gel in the housing. The shield also acts as a spring to hold the wick material against the oil
roller.