CHAPTER 2 OUTLINE OF OPERATION
COPYRIGHT © 2001 CANON INC.
2000 2000 2000 2000
CANON DADF-H1 REV.0 MAR. 2001
2-23
2.3.6 Final document size detection
Final document size detection is carried out on the basis of the document length calcu-
lated from the distance of the feed motor driven before a document passes the read sensor
(PI7) and the value of initial document size detection calculated by the document width de-
tection variable resistor (VR1).
When a document passes the document detection lever at the read sensor (PI7), the detec-
tion lever works in synchronization with the shading plate to cover the photointerrupter.
The length of the feed distance is detected by counting the clock pulses generated by the
feed motor (M2) between the two instants of read sensor (PI7) ON and read sensor
(PI7)OFF.
F02-203-05
ADF controller PCB
Document
Detection lever
PI7
READS
Summary of Contents for DADF-H1
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