Xerox DocuColor 12/DCCS50, Service Manual

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10-107 DocuColor 12/DCCS50
Inverter and Duplex Paper Path, Print Exit
Principles of Operation
Reissue
Inverter and Duplex Paper Path
After fusing, a print would enter the Inverter Path, instead of exiting the machine, for one of two
reasons:
• To be stacked in the Exit Tray or Stacker/Mailbox/Sorter in the same order that they were
printed or copied.
• As the first step in duplex printing or copying
The print is diverted into this paper path by a solenoid activated Inverter Gate. This solenoid
and gate is activated by the IOT Control and Drive PWBA.
Duplex Path
The Duplex Path transports the print back to a location before IBT image transfer so that its
reverse side can be marked.
When duplex printing is required, the Invert Solenoid activates the Inverter Gate. This Inverter
Gate directs the lead edge of print down the Invert/Duplex paper path to Inverter Rolls 1 and 2,
and the Duplex Inverter Roll. These rolls transport the print down past a Duplex Gate to a
Duplex Invert Point. At this Duplex Invert Point, the Invert Motor stops and reverses direction to
move the print
up in the paper path. The Mylar Duplex Gate directs the print into the duplex
paper path.
The print enters the Duplex Paper Path, and the print’s leading edge passes the Duplex In Sen-
sor. This sensor detects paper jams, and initiates a timing sequence which eventually results in
the IOT Control and Drive PWBAs energizing the Duplex Out Motor. The Invert Motor drives
Duplex In Roll and the Duplex Path Roll. These rolls transport the print to the duplex alignment
area.
When the Duplex Path Sensor detects the leading edge of the print, the Invert Motor deener-
gizes and the Duplex Out Motor energizes. The Duplex Out Motor drives three sets of Align
Rolls which are rotating at an angle to the transportation direction of the print. This angled drive
pushes the print edge into a Side Guide Rail and aligns the running side dimension to the side
dimension of the IBT for the second marking process. After the print is aligned, it is sent to the
Preregistration Rolls to be again deskewed against the Registration Rolls. A Duplex Out Sen-
sor detects the leading and trailing edge of the print, to detect paper jams as the print leaves
the Duplex Paper Path.
Print Exit
Print exit moves the finished print out of the machine. Depending upon machine options, exit-
ing prints can go to a Sorter, a Mailbox or a Tray Stacker.
Prints can reach the exit port from either the Inverter Paper Path or the Fuser Path. When the
print is coming from the Inverter Path, the critical condition is the state of the solenoid control-
ling the Inverter Gate. When the print is to exit the machine, the solenoid is not activated. This
allow the print to be transported directly to the Exit Invert Rolls instead of being routed into the
Inverter Paper Path.
When the print is coming from the Inverter Path, the critical condition is how far down the
Inverter Path the print is driven by Invert Rolls 1 and 2 and Duplex Invert Roll. If the trailing
edge of the print goes down past the Mylar Duplex Gate, it will be directed along the Duplex
Paper Path when it reverses direction and moves upward. If the Mylar Duplex Gate isn’t
passed, the upwardly moving print will be routed to the Exit Inverter Rolls when it reaches the
Mylar Inverter Gate.
The Exit Sensor detects paper jams by monitoring the leading and trailing edges of the print.
The Exit Motor drives only the Exit Invert Rolls. This allows the print material to exit the
machine at a transport speed of 350 mm/sec.