Paper Feeder - Oki B930 Service Manual

The force pushing up the BOTTOM PLATE is transmitted by the driving force of the MOTOR
on the FEEDER ASSEMBLY to the LIFT UP SHAFT through the GEAR (13T/60T) and SEC-
TOR GEAR (60T). The BOTTOM PLATE is pushed up by the rotation of the LIFT UP
SHAFT, which causes the supplied paper to get in contact with the ROLLER ASSY
(NUDGER).
• Paper Cassette
REAR SIDE GUIDE
BOTTOM PLATE
Detection of paper size
The paper size to which the cassette is set is transmitted to the switches S/W1 to S/W5 on
the SWITCH ASSY P S by moving these guides. The paper size is detected by the ON/OFF
information of these switches.
Paper sizes that can be automatically detected are as 5.1 Paper Size Control

Paper Feeder

Since the Tray1 and Tray2 are functionally equivalent in terms of the SWITCH ASSY P S, NO
PAPER SENSOR, LEVEL SENSOR and PRE FEED SENSOR, only the components of one tray
are described here.
The Paper Feeder is a mechanical unit for supplying paper from the Paper Cassette to the
printer. The driving force from the TRAY 1/2 FEED LIFT UP MOTOR on the FEEDER ASSY is
transmitted to the three ROLLER ASSY to feed paper.
When the ROLLER ASSY (NUDGER) picks up some sheets of paper and the remaining paper
decreases, the ACTUATOR of the LEVEL SENSOR lowers accordingly. When the LEVEL SEN-
SOR detects the lowering, the TRAY 1/2 FEED LIFT UP MOTOR is activated to lift the LIFT UP
SHAFT and the BOTTOM PLATE is also lifted accordingly. Thus, the remaining paper is ready to
be fed out.
TRAY 1/2 FEED LIFT UP MOTOR
This motor is activated to feed paper and to lift the BOTTOM PLATE. When feeding paper, it
rotates forward to drive the ROLLER ASSY (NUDGER). When lifting the BOTTOM PLATE, it
rotates reversely to drive the tray module gears to lift the LIFT UP SHAFT.
SWITCH ASSY P S
This SWITCH ASSY P S switches for setting the size of paper supplied from each Paper
Cassette. A signal indicating the set size is transmitted as a voltage to the PWBA MCU F.
NO PAPER SENSOR
If paper runs out in a Paper Cassette, the ACTUATOR lowers and the flag of the ACTUA-
TOR that has stayed in the NO PAPER SENSOR sensing area leaves there. Thus, the light
END GUIDE
FRONT SIDE GUIDE ASSY
2-8