1/05
10-136
DocuColor 12/DCCS50
The Fusing Process, Functional Description of Fuser
Reissue
Principles of Operation
The Contact Arc adjustment is done by raising or lowering the end support brackets on the
Pressure Roll with two adjustment screws. This bracket and the Pressure Roll cam up into the
Heat Roll. See the Contact Arc adjustment procedures in the Service Manual.
The Heat Roll has a light coating of oil applied to its outer surface. The oil helps prevent the
toner and p
aper from sticking to the Heat Roll. The metering of the oil is important in preventing
toner contamination on the rollers, copy jams and an excessive coating of oil on the copy. Refer
to Fuser Release Agent section for more information.
Functional Description of Fuser Subassemblies
Mechanical Drives
There are four motors that operate the Fuser functions. The motors, their functions and what
activates/deactivates the motors are listed in Table 1
The Fuser Motor is cont
rolled by the IOT Control and Drive PWBAs. Motor operation is syn-
chronized with the TR0 signal from the IBT Belt.
Through gearing, the Fuser Motor drives the Heat Ro
ller, Pressure Roller, Vacuum Transport,
Fuser Exit Rollers and Oil Pick-up Roll. Therefore, the Fuser Motor drives all of the copy trans-
port mechanisms entering, within and exiting the Fuser Assembly. This means that the three
dif
ferent
copy transport speeds will always be synchronized in the Fuser area.
The Exit Motor drives t
he Pressure Roller Cam and the Exit Rollers for the machine. Through
gearing and a clutch, the Exit Motor rotates a shaft with eccentric cams at each end. These
cams lift the Pressure Roll up into the Heat Roll forming the Fuser Nip. Brackets and adjust-
ment screws at each end of the Pressure Roll Assembly allows for Fuser Nip adjustment with-
out having to remove an of the Fuser Assembly from the machine. Refer to the Contact Arc
adjust
ment
in your service manual for this procedure.
Table 1 Fuser Drives
Motor Function Activated By Deactivated By
Fuser Motor Drives the following:
• Heat Roll
• Pressure Roll
• Vacuum Trans-
port
• Oil Pick-up Roll
• Fuser Exit Rolls
TR0 signal for first
col
or
T
rail edge of last
sheet passing the
Fuser Exit Sensor
or the Heat Roll
warming up to
Ready Tempera-
ture for the next
c
olor job.
Ex
it Motor Drives the following:
• Inverter 1 Roll
• Pressure Roll
Cam
ming
•
Machine Exit
Roll
Print Start Button Drum Motor off sig-
nal
Retract Motor External Heat Roller
Cam
TR0 signal for first
col
or
T
rail edge of last
sheet passing the
Fuser Exit Sensor
or the Heat Roll
warming up to
Ready Tempera-
ture for the next
c
olor job.
W
eb Motor Web Take-Up Roller Fuser Exit Sensor
ON
ON time ended by
S/W t
imer
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