Ricoh PRIPORT VT 2000 Series Service Manual page 132

6.2 PAPER DETECTING AND PRINTING PRESSURE
ON/OFF MECHANISM
[I]
[E]
[D]
[C]
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]. Dur-
ing the printing 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 pres-
sure 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 pres-
sure cam [B] and the pressure roller [I] moves against the drum for printing.
The printing pressure is determined by the pressure spring [G] which is ad-
justable. The printing pressure sensor [H] is not interrupted when the press
roller [I] comes near the drum.
6.3 PRINT PRESSURE RELEASE MECHANISM
[B]
[A]
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28 February '91
[G]
[F]
[C]
[H]