Original Size Detection - Canon imageRUNNER C1335 Series Service Manual

2
Technical Explanation > Original Exposure and Feed System > Control of ADF > Original Detection
■ Feed/Delivery of Original
● Basic Operation
After stream reading on the Copyboard Glass is completed, the Feed Roller rotates to send
an original to the Delivery Tray. Then, the ADF Motor (M02) stops.
M02
Stop M02
NOTE:
For single-sided reading after delivery, a processing to ascend the Pickup Roller is
performed.
For duplex reading, it is not performed because it has already been executed.
2 Technical Explanation > Original Exposure and Feed System > Control of ADF > Original Detection
SL01
Delivery Roller
F-2-34
■ Original Detection
● Detection of presence/absence of original
As the actuator is pushed up by placing an original on the Original Tray, the Original Sensor
(PS03) is turned ON (light is transmitted -> light is blocked) so that the presence of an original
is detected.
● Original size detection
The original size is determined by the time required from when the Document End Sensor
(PS02) detects the original's leading edge to when it detects its trailing edge.
As the actuator is pushed up by the leading edge of the fed original, the Document End
Sensor (PS02) is turned ON (light is blocked -> light is transmitted) so that the arrival of the
original's leading edge is detected. In addition, when the trailing edge of the original passes
the position of the actuator, the actuator returns to the original position, which causes the
Document End Sensor (PS02) to turn OFF (light is transmitted -> light is blocked). The trailing
edge of the original is detected by the time required for the Document End Sensor (PS02) to
turn OFF from when it was turned ON.
PS02 PS03
6 5 4 3 2 1 J903
J8102
12 11 10 9 8 7 6 5 4 3 2 1
Main Controller PCB
2-25
F-2-35
2-25