Oki MC160MFP Maintenance Manual page 39

Oki Data CONFIDENTIAL
13.3.3 Cleaning blade pressure/retraction mechanism
13.3.3 Cleaning blade pressure/retraction mechanism
• In color printing, an image is formed on the transfer belt for each color of toner. The
cleaning blade is therefore provided with a pressure/retraction mechanism.
• The machine is not, however, provided with a pressure/retraction sensor. Instead, the
IDC sensor detects a sample image on the transfer belt to control the pressure/retraction
operation.
• In monochrome printing, no retraction sequence is carried out.
• The cleaning blade is normally in pressed contact with the transfer belt.
A. Pressure/retraction operation
• The cleaning blade pressure/retraction operations are performed by the Transport motor
(M1), Cleaning blade pressure/retraction solenoid (SD5), pressure cam, and the lever.
• When the Cleaning blade pressure/retraction solenoid (SD5) is energized, drive from the
Transport motor (M1) is transmitted to the pressure cam.
Cleaning blade
44292401TH Rev.1
Pressure cam
Cleaning blade pressure/
retraction solenoid (SD5)
Pressure
cam
Transport motor (M1)
A034T2C529AA
B. Operation timing
Cleaning blade pressure/
retraction solenoid
Cleaning blade pressure/
Retraction stop
retraction condition
Cleaning blade pressure/
retraction solenoid
Cleaning blade pressure/
Pressure stop
retraction condition
C. Retraction sequence
1. Drive from the Transport motor (M1) is transmitted to the drive gear.
2. Rotation of the drive gear is transmitted to the pressure cam.
3. When the Cleaning blade pressure/retraction solenoid (SD5) is energized, the half-
moon-shaped pressure cam rotates a half turn to push the lever forward.
4. When the lever is pushed forward, the cleaning blade is retracted.
5. When the cleaning blade is retracted, it results in the cleaning blade being retracted
from the transfer belt.
Cleaning blade pressure/retraction solenoid (SD5)
Cleaning blade
lever
COMPOSITION/OPERATION
Point of contact with the transfer belt
During pressure operation Retraction stop
Point of contact with the transfer belt
During retraction operation Pressure stop
A034T2E584AA
Cam
A034T2C553AA
38 /