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COPYRIGHT © CANON ELECTRONICS INC. 2008 CANON DR-X10C FIRST EDITION
2-17
CHAPTER 2 FUNCTION & OPERATION
Then the double feed retry is described
below. If the double feed retry function is not
disabled, the feeding of the document stops
when a double feed is detected by the ultra-
sonic sensor. The document is returned to the
pickup inlet by rotating the rollers in the re-
verse direction. The motor that drives the
rollers located where the document stops can
be rotated in the reverse direction.
If there are no reverse rollers, the feeding
force is not stable and the document may be
skewed or jammed when it is returned. In
case of ordinary feeding, the reverse roller is
not necessary, so it is at the upper position,
and does not touch the document. When re-
turning the document, the reverse roller is
moved downward.
However, if a double feed is detected after
the document is fed backward 100 mm or
more from the registration sensor (rear), the
double feed retry is not carried out.
Ultrasonic sensor
Registration roller
Reading roller (front)
Feed roller
Retard roller
Figure 2-304
Then, a side view when the reverse roller
moves upward and downward is shown below.
When the reverse motor rotates, the sensor
lever
{
1
rotates. The sensor lever is inte-
grated with the cam
{
2
. Since this cam sur-
face is in contact with the surface of the
mounting plate
{
3
of the reverse roller, when
the sensor lever rotates, the mounting plate
rotates and the reverse roller
{
4
lowers.
Reverse roller is up.
Sensor lever
Cam
Reverse roller
Clearance
Reverse roller is down.
Mounting
plate
Rotation
Sensor lever
Mounting
plate
Cam
Reverse roller
Figure 2-305