Xerox DocuColor 12/DCCS50 User Manual

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DocuColor 12/DCCS50
DADF Document Transport
Principles of Operation
Reissue
Table 1 shows the speed and direction of the rollers driven by the DADF Belt Motor drive.
The DADF Belt Motor operates in the forward direction when moving documents from the Input
Tray
Assembly to the Platen Glass, and when moving documents from the Platen Glass to the
Output Tray.
The Belt Motor moves in the reverse direction to turn over the document for copying the sec-
ond side, and for re-inverting the document for correct order stacking in the Output Tray. Refer
to
In
verting Documentation for more information on this function.
Figure 3 Belt Motor Drive Rotation
Exit Motor
The Exit Motor is a +24 VDC stepper motor that drives th
e Exit Roll. The Exit Motor is ener-
gized when each document has been scanned and the document is not being routed through
the i
nvert path. It’s run duration depends on the document run length dimension. The DADF
Control PWBA provides drive to the Exit Motor in intermittent pulses. This technique is used to
help conserve energy consumption in the machine. An Exit Senor senses the document trailing
edge and this signal is sent to the DADF Control PWB. This signal deenergizes the Exit Motor.
Refer to F
igure 1 for more information on the timing of the DADF motors.
DADF S
ensors
The DADF uses six sensors for detecting document transport and document size. Refer to Fig-
ure 2 fo
r more information on the DADF sensor timing.
A descr
iption of these sensors follows:
•
Document Set Sensor - When a document is loaded into the Input Tray, it pushes a lever
causing a flag to block this sensor. This signal is sent to the DADF Control PWB.
•
Size Sensors (2) - These are reflective Optical Sensors that sense the document length of
the leading edge. See DADF Document Size Sensing for more information on this func-
tion.
•
Registration Sensor - This is a reflective Optical Sensor that is before the Registration
Roll. It is used to sense misfeeds from the Input Tray and to start the time sequence for
deenergizing the Feed Motor and energizing the Belt Motor.
This sensor also is used to determine the documen
t’
s transport run length. This is calcu-
lated by multiplying the length of time that the sensor is
blocked by the transport speed of
the DADF.
•
Duplex Sensor - This is a reflective Optical Sensor in the inverter paper path the senses
paper jams.
•
Exit Sensor - This is a reflective Optical Sensor that is used to verify documents exit to the
Output Tray, indicate paper jams, signal the DADF PWB to deenergize the Exit Motor and
to energize the Set Gate Solenoid to raise the Set Gate.
Refer to F
igure 2 f
or more information on the use of sensors for DADF control.
Document Feeding Control
The document is fed from the top of the stack. The feed edge of the document is placed
against the Entrance Gate in the Input Tray Assembly. The Entrance Gate is in the raised posi-
tion when no documents are covering the Document Set Sensor, and the front and rear Top
Cover
I
nterlocks are both closed.
When the Document Sensor senses a document in the DADF
Input Tray Assembly and after
the user presses the machine’s Start button, the Entrance Gate Solenoid drops the Entrance
Gate so that the document can be fed into the DADF.
DADF Document Size Sensing
The document length (transport dimension) is measured by the DADF Control PWBA counting
the number of Belt Motor pulses while the document passes the Registration Sensor. The
width of the document is determined by the Front and Rear DADF Size Sensors. The Rear (#1)
DADF Size Sensor is positioned 226 mm from the rear guide of the Input Tray Assembly. The
Front (#2) DADF Size Sensor is positioned 287 mm from the rear guide of the Input Tray
Assembly. Table 2 lists the states of these two sensors for the different sizes of documents.
Table 2 DADF Document Size Sensing
Document Size
(in)
DADF
Rear (#1)
Sensor
DADF Front (#2)
Sensor
Length of
d
etected
Original
(mm)
Length of
Origina
l (mm)
A4 SEF OFF OFF 240.14 297
B5 SEF OFF OFF 200.14 257
A5 SEF OFF OFF 153.14 210
A5 LEF OFF OFF 91.14 148
8.5x14 SEF
(Regal)
OFF OFF 298.74 355.6

Xerox DocuColor 12/DCCS50 Specifications

General

Brand	Xerox
Model	DocuColor 12/DCCS50
Category	All in One Printer
Language	English