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CHAPTER 2 FUNCTIONS & OPERATION
6) Sensor
The document sensor is mounted on the
inlet, the registration sensor is mounted
before and after the registration roller,
and the eject sensor is mounted
immediately after the straight eject roller.
Furthermore, the ultrasonic sensor for
double feed detection is mounted in front
of the registration roller.
In addition, the skew sensors (R and L)
are mounted in front of the registration
roller in this device. This detects when
the document is skewed. This makes it
possible to both prevent damage to the
document if it is skewed, and to detect
documents that are held by staples.
2. Feed Error Detection
1) Paper Jam Detection
Paper jams are detected by the
registration sensor and eject sensor. The
types of the document jams are
described as follows.
a) Pickup Delay Jam (Pickup Error)
The leading edge of the document
was not detected by the registration
sensor within the specified time after
the machine starts scanning.
b) Early Reach Jam
The leading edge of the following
document was detected after the
trailing edge of the document was
detected by the registration sensor
before the document has been fed for
a specified length.
c) Residual Jam
The trailing edge of the document
was not detected even though the
document has been fed for the
maximum specified length after the
leading edge of the document was
detected by the registration sensor
and eject sensor.
d) Fast Feed Jam
The trailing edge of the document
was detected after the leading edge
of the document was detected by the
registration sensor before the
document has been fed for the
minimum specified length.
e) Non-removal Jam
The machine starts scanning while
the document is detected by the
registration sensor and eject sensor,
and still remains inside this machine.
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CANON ELECTRONICS INC. 2011 CANON DR-M140 FIRST EDITION
2-11