Ricoh C211 Service Manual page 450

3. Master Feeding Mechanism
[01
\
/Q]
/
\
[H] \
[P]
'[E]
The original transport motor starts rotating after the drum rotates 120 degrees past the
2nd drum position sensor. The reverse roller solenoid [A] and the master feed motor [E]
turn on after the original is fed 14 mm. The rotation of the master feed motor [E] is trans-
mitted to the platen roller [F] through the belt [C] and the pulley [D] which feeds the
master and forces the master to contact the thermal head [P]. Also, the rotation of the
pulley [D] is transmitted to the pulley [J] through the belt [H] to drive the upper feed
roller [K] and the lower feed roller [L] for master feeding.
The spring clutch [B] is located behind the reverse roller [N]. When the reverse roller
solenoid [A] turns on, the rotation of the upper feed roller [K] is transmitted to the
reverse roller [N] through the belt [1] as the stopper
[G]
releases the spring clutch [B],
thus feeding the master. Also, the master is directed down to the clamper [Q] of the
drum by the reverse guide
[M].
After the master is fed 61 millimeters, the master feed clamper solenoid turns off because
the master leading edge has already reached the clamper [Q]. At the same time, the
reverse roller solenoid [A] turns off and the reverse roller [N] stops.
A leaf spring on both holders [0] prevents any master buckle due to free rotation of the
master roll.
2-38