CHAPTER 7 PICK-UP / FEEDING SYSTEM
2. External Brush
As many as two external brushes are provided: by the drive of the transfer drum cleaner motor
(M8), the upper brush rotates in the same direction as the transfer drum, while the lower brush
rotates in the opposite direction at a high speed. The toner and paper lint cleaned by the brushes are
collected inside the cleaner unit.
The transfer drum cleaner unit houses external brushes. When the transfer drum cleaner
locking motor (PM6) turns on, its drive is transmitted to the cam.
The motor (PM6) is a stepping motor, and is used to control the position where the transfer
drum cleaner is locked or unlocked by applying specific pulses to the motor after the DC-CPU has
detected home position with reference to the signal from the transfer drum cleaner HP sensor
At the same time, the internal brushes are also butted against the inner side of the transfer drum
sheet opposite the external brushes by the work of the cam inside the transfer drum operated by the
drive of the attraction/transfer locking cam motor (PM7).
The position of toner used to detect the concentration of each color toner on the photosensitive
drum comes face-to-face with the transfer drum linking plate in reference to the transfer drum; as
such, cleaning is performed so that a width in front of and behind the transfer drum linking plate is
Table 7-503 shows the conditions and the length of operation for cleaning the transfer drum
During last rotation after making 1 to 9 copies
During last rotation after making 10 to 49 copies
During last rotation making 50 to 100 copies
During last rotation after making 101 or more copies
During jam recovery
3. Polishing Roller
As the copier is used more and more, the surface of its transfer drum sheet tends to collect paper
lint and, as a result, its power of attraction will decrease. To prevent such a phenomenon, the
surface of the transfer drum sheet is polished after making a specific number of copies, thereby
restoring the power of attraction.
When the polishing roller motor (M9) turns on, the drive belt and the drive gear start to rotate
to rotate the spring clutch. Then, the work of the polishing roll locking spring causes the polishing
roller to butt against the transfer drum sheet (while rotating and pivoting on the shaft of the motor)
and face-to-face with the internal brushes.
At this time, the internal brushes are also butted against the transfer drum sheet, and the surface
of the transfer drum is polished in this condition.
COPYRIGHT © 1999 CANON INC.
Equivalent of 1 rotation of the
Equivalent of 2 rotations of the
Equivalent of 3 rotations of
Equivalent of 4 rotations of the
Equivalent of 3 rotations of the
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Length of time