Duplex Unit
SM 6-77 G133
Detailed
Descriptions
6.11.2 DUPLEX DRIVE
The duplex inverter motor [A] drives the following:
Duplex inverter rollers [B]
Duplex transport roller [C]
The duplex/by-pass motor [D] drives the following:
Duplex/by-pass transport roller [E]
Duplex transport rollers [C][H]
The duplex entrance sensor [F] and duplex exit sensor [G] control the interleave movement
and detect paper jams.
There is a one-way clutch on the shaft of roller [C] where it meets the timing belt of motor
[A]. Because of this, when the motor [A] feeds the paper into the inverter, roller [C] does not
turn.
Then after inverting, motor [A] changes direction, and the paper goes back into the
machine. For some longer paper sizes, the previous sheet is still feeding when this
happens, so motor [A] must stop while motor [D] is still feeding the previous sheet down to
the registration roller. This is why we have two motors ([A], [D]) controlling one roller [C].
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