Transfer Belt Unit Drive; Belt Tension Unit - Ricoh G092 Service Manual

6.3.6 TRANSFER BELT UNIT DRIVE

Belt tension unit

[M]
[L]
G081D101.WMF
[A]: Sensor actuator
[B]: Cam 1
[C]: Cam 2
[D]: Ratchet mechanism
[E]: Drive gear
[F]: Pawl
[G]: Cam solenoid
During monochrome printing, the transfer belt contacts the black OPC drum only.
During color printing, the belt contacts all OPC drums. When not required, the belt
is moved away from all OPC drums. These actions are made possible by the belt
tension unit. The unit is driven by the BK motor.
When the cam solenoid [G] turns on, the pawl [F] holds the ratchet mechanism [D]
(and the solenoid turns off). This action enables the shaft [M] to start revolving.
When the shaft has made a quarter revolution, the pawl releases the ratchet
mechanism. During a job, the shaft makes one complete revolution, in four 90-
degree steps. The position of the shaft depends on the current phase of the job.
• Phase 1–Home position (0-degree position – this is the home position
• Phase 2–Belt cleaning (90-degree position) – the belt is cleaned at the start of
the job
• Phase 3–Continuous printing (180-degree position) – the belt stays in this
position during the job
• Phase 4–Last-page printing (270-degree position) – this phase begins after the
toner images for the final page have been transferred from the OPCs
SM
[B]
[A]
[K]
[H]: Cam slider
[I]: Belt home position sensor
[J]: Changer solenoid
[K]: Belt-transfer-roller changer
[L]: Interface roller
[M]: Shaft
6-19
[C] [D]
[J]
PRINT PROCESS
[E]
[F]
[G]
[H]
[I]
G081/G092