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CANON ELECTRONICS INC. 2011 CANON DR-C125 FIRST EDITION
CHAPTER 2 FUNCTIONS & OPERATION
4) Separation
Separation of the documents is
performed by the retard roller.
When the feed selection lever is selected
as normal (feed), and the overlapped
documents enter into the clearance
between the feed roller and the retard
roller as shown in Figure 2-304, the
document in contact with the feed roller
is fed in the feed direction and the retard
roller does not rotate so that the
document in contact with the retard roller
is not pushed in.
If the pickup exchange lever is switched
to non-separation position, the retard
roller rotation becomes free and the
separation function becomes invalid.
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.
Since the torque limiter is built in the
retard roller, when the outside pressure
on the roller exceeds the specified value
into the feed direction, the roller begins to
rotate in the same direction. This would
also prevent the document damage when
the user pull the jammed document out.
Feed roller
Retard roller
Figure 2-304
2-10