Operational Overview; Overview; Fixing Pressure Roller Cleaning - Canon GP160F Service Manual

I. OPERATIONAL OVERVIEW
A.

Overview

The main motor drives both the fixing assembly's pressure roller and the delivery
roller. The paper, which has separated from the photosensitive drum, is then fed into the
fixing assembly by means of the feeder belt. After the toner has been fixed to the paper
by the fixing film and the pressure roller, it is fed out of the machine.
The paper, which is fed out of the fixing assembly is detected by the delivery sensor
(PS306).
B.

Fixing pressure roller cleaning

Occasionally, problems such as smudges or blotches appear on the reverse side of
the paper due to toner which has adhered to the fixing pressure roller. In order to elimi-
nate these types of problems, this unit is equipped with a cleaning roller mechanism,
which cleans the fixing pressure roller.
Figure 8-101 illustrates this mechanism's construction. The cleaning roller comes
into contact with the fixing pressure roller. Rotation of the fixing pressure roller causes
the cleaning roller to also rotate, and any clumps of toner which may have adhered to
the surface of the pressure roller are thereby removed.
The fixing pressure rolling cleaning only takes place when the fixing pressure roller
is rotating, and the cleaning mechanism only works during printing when the pressure
roller is rotating.
Also, when the unit's print counter reaches 500 sheets, the rotation time is elongat-
ed. After every five hundredth copy, the length of time the pressure roller rotates is
extended. Consequently, a more thorough cleaning of the fixing pressure roller is
achieved, increasing the overall effectiveness of the cleaning process.
Delivery roller
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Cleaning roller
Pressure roller
Figure 8-101
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 8 FIXING SYSTEM
Fixing film
Fixing heater
Fixing assembly inlet guide
8-1