Canon DADF-J1 Service Manual page 42

CHAPTER 2 OPERATIONS AND TIMING
The registration roller clock sensor (PI5) is used to measure the length of originals with
reference to the revolutions made by the clock plate mounted to the slave roller of the regis-
tration roller. Based on the revolutions of the lock plate, the ADF controller PCB identifies
the length of the original in question (in feeding direction).
Registration roller
The DADF uses the data on the width and the length of the original obtained by original
detection 2 to identify a default size, and sends the result to the copier. In response, the
copier selects the appropriate copy paper size to suit the identified size of the original.
2-20
ADF controller PCB
Slave roller
F02-203-05
COPYRIGHT © 2001 CANON INC.
Registration roller
clock sensor (PI5)
Clock plate
2000 2000 2000 2000 CANON DADF-J1 REV.0 MAR.2001