Ricoh A156 - Page 84

When the drum charge roller does not contact the drum, the drum charge
roller is driven by the main motor through gears [A]. (The roller speed is 50
rpm for A153, A155, and A156 copiers, and 37 rpm for A157, A159, and
A160 copiers.) At this time, the roller touches the cleaning pad, and this
helps keep the roller clean, although a cleaning routine automatically takes
place at the end of every copy cycle (see below).
When the drum charge roller contacts the drum, the force (torque) imparted
by the drum becomes greater than the force transmitted through the clutch
[B]. Then, the drum charge roller rotates with the drum.
The drum charge roller comes away from the drum after every copy job. For
2 seconds after the end of every copy job and for 10 seconds after every
copy interval set by SP2-901, the drum charge roller is driven by the main
motor via gears [A] for cleaning (see "Drum Charge Roller Cleaning").
After cleaning, the main motor stops. While the main motor is not rotating,
the drum charge roller is kept away from the drum. This prevents the drum
charge roller from adhering to the drum.
[B]
[A]
[A]
A156/A160/A162 2-36 STM