Xerox DocuColor 12/DCCS50, Service Manual

Page: 1480 / 1617

1/05
10-60 DocuColor 12/DCCS50
DADF Document Transport
Reissue
Principles of Operation
Figure 1 DADF Drive Component Locations
Figure 2 DADF Sensor Locations
Drive Motors
Feed Motor
The Feed Motor is controlled by the DADF Control PWBA and turns the Nudger and Feed
Rolls. The Nudger Rolls feeds the top sheet into the nip of the Feed and Retard Roll. The Feed
Roll turns against the Retard Roll, which drags against sheets below the top and prevents pre-
vent multiple sheet feeds.
The Feed Motor is energized 200 msec. after the user presses the Start Button. The Feed Roll
takes the top document in the stack and transports it into the nip of the stationary Registration
Rolls. The Feed Motor deenergizes 50 msec.after the trailing edge of the document passes the
Registration Sensor.
The DADF Control PWBA does not energize the DADF Feed Motor unless the following safety
interlock switches are closed:
• The Platen Interlock is closed by lowering the DADF onto the Platen Glass.
• Two Top Cover Interlocks are closed by closing the top cover on the left side of the DADF.
Belt Motor Drive
The DADF Belt Motor is a +24 VDC, bidirectional stepper motor. This motor drives these roll-
ers:
• Registration Roll
• Belt Roll
• Lower Duplex Roll
• Upper Duplex Roll
Nudger Roll
Feed Roll
Retard Roll
Exit Roll
Belt Drive Roll
Belt Idler Roll
Pinch Rolls
Registration Roll
Registration Pinch Roll
Upper Duplex Roll
Lower Duplex Roll
SIZE SENSORS
(F and R) TOP COVER INTERLOCK
SWITCHES (F and R)
REGISTRATION
SENSOR
DOCUMENT
SENSOR
DUPLEX
SENSOR
EXIT
SENSOR
DADF OPEN-
SWITCH (R)
Table 1 DADF Motor Driven Rolls
Motor Rolls
Transport Speed
(Forward - ccw) Transport Speed
(Reverse - cw)
Feed Motor
+ 24 VDC
Nudger Roll (cw) 223.9 mm/sec
Feed Roll (cw) 268.7 mm/sec
Belt Motor
+24 VDC Stepper
Bi-directional
Registration Rolls 810.6 mm/sec
Belt Drive Rolls 806.0 mm/sec 873.7 mm/sec
Lower Duplex Roll 671.7 mm/sec
873.7 mm/sec
when re-inverting
for exit stacking
only
Upper Duplex Rolls 671.7 mm/sec
873.7 mm/sec
when re-inverting
for exit stacking
only
Exit Motor
+24 VDC Stepper
Exit Rolls 840.2 mm/sec
manuals4you.com manuals4you.com