CHAPTER 2 FUNCTIONS & OPERATION
Figure 2-303
Note that if Folio mode or non-separating
mode is selected, the separation clutch
(electromagnetic clutch) is operated to
allow the feed roller to rotate freely and
the feed motor is driven in reverse with
the document fed by the rotation of the
retard roller.
To provide space between the trailing
edge of a document and the leading
edge of the next document, the drive
speed of the feed roller is slightly lower
than the drive speed of the registration
roller and eject roller. If it is left as it is,
the document is braked when it touches
the feed roller and the registration roller,
and therefore, a one-way clutch is built
into the gear used in the feed roller drive
system to follow the drive speed of the
registration roller.
Retard roller
a.
5) Pickup and separation retry
This machine is equipped with pickup
retry and separation retry functions.
When a misfeed or double feed (faulty
separation) occurs, scanning is able to
continue if the fault can be cleared by
repeating these operations.
If the document is not detected by the
pre-registration sensor within the
designated period of time, the pickup
retry operates the separation clutch to
allow the feed roller to rotate freely, and
returns the document to the inlet by the
rotation of the retard roller before trying
again.
Feed roller
b.
Separation retry stops the feed motor
momentarily once the document is
detected by the pre-registration sensor,
and detects whether or not the document
has double fed using an ultrasonic
sensor. If a double feed is detected, the
document is returned to the inlet the
same as for pickup retry before trying
again.
The following shows the state when a
double fed document begins to be
returned.
2-10
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CANON ELECTRONICS INC. 2011 CANON DR-M160 FIRST EDITION