DUPLEX PRINTING PROCESS
SM 15 G390
G390
Duplex Unit
2.3 DUPLEX PRINTING PROCESS
Overview of the duplex printing procedure:
1. The printer prints the second side of the first
sheet.
2. The paper gate solenoid then energizes to actuate
(open) the paper gate [A] ( 2.4). The leading
edge of the first sheet [B] then enters the duplex
unit.
3. The paper gate solenoid de-energizes to de-
actuate (close) the paper gate after the trailing
edge of the first sheet enters the duplex unit.
4. The transport motor is then activated to drive the
entrance roller [C], the upper transport roller [D],
and the lower transport roller [E] ( 2.5). The first
sheet moves to the inverting roller.
5. The inverting motor then activates to drive the
inverting roller [F]. The first sheet now moves to
the rear paper path ( 2.5).
NOTE: The inverting motor also drives the exit
roller [G].
6. The inverting motor reverses direction to drive the
inverting roller the opposite way. This drives the
paper down towards the exit roller.
NOTE: The inverting motor also drives the exit
roller in reverse.
7. When the first sheet reaches the exit roller, the
inverting roller stops. The first sheet [H] remains
there momentarily, with the leading edge on the
exit roller.
8. Now the printer prints the reverse side of the
second sheet [I].
9. The inverting motor activates. The inverting roller
and the exit roller move the first sheet to the
registration roller of the printer.
10. Now, the printer prints the front side of the first
sheet and transports it to the exit tray.
G390D906.WMF
G390D907.WMF
G390D908.WMF
[E]
[C]
[D]
[F]
[G]
[A]
[B]
[H]
[I]
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