Paper Switchback Mechanism - Develop QC 2235 Plus Service Manual

Mechanical operations
4.1.2

Paper switchback mechanism

• When the last paper of the first print set is transported onto the Finisher Tray during a multi-print cycle
in the Sort Staple mode, the first paper of the subsequent print set, which is to be next transported,
undergoes a switchback sequence. The paper for the switchback is transported via the lower paper
path.
• The second paper of the second print set is placed over the paper which has undergone the switch-
back sequence. After the first print set has been fed into the Elevator Tray, the first and second sheets
of paper of the second print set are together transported onto the Finisher Tray.
• The switchback sequence of the paper is performed by turning the motor backward, which turns the
Lower Path Transport Roller and Storage Roller backward.
• The sheet of paper to be transported next to the one subjected to the switchback sequence is trans-
ported via the upper paper path.
• No switchback sequence is carried out if the interval between sheets of paper is wide as when using
paper of a large size.
<Three A4 originals for two print sets>
The sheets of paper for the first print
are transported via the upper paper
path onto the Finisher Tray.
The first sheet of paper of the second
print set is transported via the lower
paper path.
The first sheet of paper of the second
print set undergoes the switchback
sequence and stops. The second
sheet of paper stops as soon as its
trailing edge leaves the Entrance
Roller.
QC 2235plus Theory of Operation Ver.1.0 Feb. 2004
, , : Sheets of paper for the first print set
', ', ': Sheets of paper for the second
print set
The first and second sheets of paper
of the second print set are transported
together, one on top of the other.
The Exit Rolls are pressed against the
Exit Roller to feed the sheets of paper
of the first print set out. At the same
time, the first and second sheets of
paper of the second print set are
transported toward the exit.
When the first print set is fed out, the
Exit Roller starts turning backward to
transport the first and second sheets
of paper of the second print set to the
Finisher Tray. The Exit Rolls leave the
Exit Roller.
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