Various Control; Original Detection - Canon MF4500 Series Service Manual

2
Technical Overview > Document Exposure/Feeder System > Document Feeder System > Various Control

■ Various Control

● Original Detection
There are two types of original detection in this equipment.
1. Original Presence / Absence Detection
Detected by DS (Document Sensor
Setting the original onto the original tray pushes up the actuator, activating (light shielded
=>light transmitted) the DS, and resulting in detection of the presence of original.
2. Detection of the End of the Original
Detected by the DES (Document End Sensor)
The leading edge of the original that is fed pushes up the actuator, activating the DES (light
shielded =>light transmitted) and resulting in detection of the reach of the leading edge of
original. Furthermore, when the trailing edge of the original passes the actuator position,
the actuator returns to the original position, inactivating the DES (light transmitted => light
shielded). The trailing edge of the original is detected by this mechanism. The original
length that can be scanned with this equipment is less than 400 mm. Passing of the original
longer than this results in jam stop. The original length is calculated by the time it takes
from detection of the leading edge of the original to detection of the trailing edge of the
original.
Note:
There is no function to detect the original size (original width, length) in this equipment.
2 Technical Overview > Document Exposure/Feeder System > Document Feeder System > Various Control
In the case of SADF
Document
Sensor
Document
End Sensor
J15
1 2 3 4 5 6
SCNT
In the case of DADF
Document
Sensor
Document
End Sensor
J15
1 2 3 4 5 6
SCNT
2-9
F-2-12
F-2-13
2-9