Feed System; F E E D S Y S T E M - Canon DR-9080C Service Manual

III. FEED SYSTEM
1. Outline
Fig. 2-301 shows a cross section of the
document feed system.
The various drive rollers are rotated by
motors via gears and timing belts.
For controlling the document feed, various
sensors are arranged in necessary positions of
the system. The arrangement of the sensors is
shown in Fig. 2-301, 2-302 and 2-303.
The document feed system is equipped with
the following functions.
• Document tray driving mechanism
During pick-up, this mechanism raises the
document tray, and when pick-up is finished,
lowers it.
• Separating mechanism
Overlapped documents can be separated by
the retard roller and the feed roller, to feed the
documents one by one.
• Staple detection
Detects the jumping up of documents bundled
by staples when they are picked up, and stops
the feeding.
• Skew correction mechanism
Detects skewed documents, enabling
correction by the rollers, as well as in the
scanned image. This selection is performed by
the computer.
• Ultrasonic double feed detection
Overlapping documents (indicating double
feeding) can be detected by the ultrasonic
sensor.
• Feed error detection
Feed errors (jams) can be detected by the
registration sensors (front & back).
• Special feed mode
Checks the feed condition of the machine
whithout using the personal computer.
COPYRIGHT © 2003 CANON ELECTRONICS INC. CANON DR-6080/9080C REV.0 SEPT. 2003
CHAPTER 2 FUNCTIONS & OPERATION
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