The Refeed Unit - Oce 3121 Technical & Service Manual

Sequence of operations (two-sided copying)
After it leaves the fuser, the copy is directed towards the output tray. A short
time after the copy passes the sensor PS7, the delivery roller reverses. The mo-
tor M8 is switched on at a specified time after the copy passes PS7.
The copy is directed down to the refeed unit, preparing for the imaging of the
second side. The figure shows the sequence of operations for two-side copies.
Fixing rear paper
sensor (PS7)
Paper deflecting plate 1
solenoid (SL5)
Delivery roller motor
(PS13)
Delivery sensor (PS13)

3 The refeed unit

Outline
The copies carried to the refeed unit, are arranged in a step formation: ready
for two-sided copying or for overlay copying.
The step formation: the leading edge of each sheet is slightly behind the lead-
ing edge of the previous sheet. This enables correct separation of the copies as
they are peeled off the bottom of the stack.
Parts name
Main motor
Motor for the retarding roller
Motor for the exit roller
Sensor for the re-pick entry
Lower feeding assembly inlet paper sensor
Solenoid for the re-pick entry
Clutch for the lower refeed
504 TSM Océ 3121
SCFW
*1 :
Copy paper is moved to the lower feeding assembly.
*2 :
Copy paper is moved to the delivery assembly.
Pick-up started for 2nd side
SCRV LSTR
*2 *1
CW CCW
SCFW SCRV LSTR
*2
Notation
M1
M6
M7
PS11
PS12
SL4
CL5
Functional description