Ricoh C211 Service Manual page 481

2. Paper Detecting and Printing Pressure ON/OFF Mechanism
Y'
Printing Pressure ON + Printing Pressure sensor [H] is not interrupted.
Printing Pressure OFF -+ Printing Pressure sensor [H] is interrupted.
The main motor turns the gear [A], thus rotating the pressure cam [B]. During the print-
ing process, the pressure cam [B] turns clockwise as the main motor turns clockwise.
When paper is not fed, the pressure ON/OFF lever [C] is locked by the paper detecting
arm [D]. However, when paper is fed, the bearing of the pressure ON/OFF lever [C]
rides up on the top of the pressure cam [B] and slight clearance is made between the
paper detecting arm [D] and the pressure ON/OFF lever [C]. At this moment, the paper
turns the paper detecting feeler [E] slightly clockwise and a clearance forms in the lock
section. Therefore, the paper detecting arm [D] turns clockwise, releasing the lock of the
pressure ON/OFF lever [C]. Also, the printing pressure solenoid [F] turns on to release
the pressure ON/OFF lever [C]. As a result, the bearing of the pressure ON/OFF lever
[C] moves along the pressure cam [B] and the press roller [1] moves against the drum
for printing.
The printing pressure is determined by the pressure spring [G] which is adjustable. The
printing pressure sensor [H] is not interrupted by Lever [J] when the press roller [1] comes
near the drum.
2-68
Rev. 8/89