Table of Contents
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Overview
This chapter describes the electrical and mechanical components of the Duplex Automatic
Document Feeder (DADF). The DADF performs these primary functions:
•
Automatically feeds a document or a stack of documents, one at a time, from an Input
Tray onto the Platen Glass of the machine for copying.
•
Deskews the document before copying.
•
Aligns the document onto the Platen Glass for proper copier registration.
•
Automatically inverts (turns over) a two-sided document, deskews, and registers it onto
the Platen Glass for copying the second side of the document.
•
Automatically stacks the documents that have been copied onto an Output Tray. A user
selected option allows two-sided documents to be re-inverted (turned over again) for
proper stacking onto the DADF Output Tray.
This chapter will cover the following:
•
Overview
•
Electrical Power
•
DADF System Control
•
DADF Document Transport
•
DADF Operation
Figure 1
shows the DADF.
Figure 1 Duplex Automatic Document Feeder
Reissue
DocuColor 12/DCCS50
DADF INPUT TRAY
DADF OUTPUT
TRAY
1/05
10-55
The original documents are placed face up onto the Input Tray. The documents are fed from the
top of the stack into the DADF. A Nudger Roll supplies the top sheet to the nip of the Feed and
Retard Roll. The Feed Roll transports the document sheet to the Registration Roll. The DADF
temporarily stalls the Registration Roll to deskew the document before sending it to the Platen
Belt. The Platen Belt, driven by a Belt Motor, positions the document on the Platen Glass. For
one-sided documents, the Platen Belt moves each document to the Output Tray when scan-
ning is complete. For two-sided documents, each document is routed through an invert path,
then scanned again. Depending on a user selection, the document can be again routed
through the invert path to preserve original order stacking after scanning. Regardless of what
has proceeded, the document is ultimately routed to the Output Tray by the Platen Belt and Exit
rolls. Refer to
DADF Document Transport
tion.
The DADF can automatically sense the document size. This is done by:
•
Two Size Sensors in the DADF read front to back dimensions (feed width)
•
A pulse count of the Belt Motor while the Registration sensor is blocked and reads the
(run) length dimension
The DADF has two operator selectable modes:
•
Same Size Mode is used when all documents are of the same size. This mode provides
the highest productivity, since the copier does not slow down to detect the size of each
document.
•
Mixed Size Mode is used when documents of different sizes are placed in the DADF. The
copier automatically detects the size of each document as it is fed onto the Platen Glass.
When either of these modes are selected, they will be applied to all the documents in the stack.
Refer to
DADF Document Size Sensing
and
Inverting Documentation
for additional informa-
for more information on this function.
Principles of Operation
Overview
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Table of Contents
Troubleshooting
