Canon DADF-J1 Service Manual page 54

CHAPTER 2 OPERATIONS AND TIMING
Both separation sensor and skew sensor are used to find out whether an original is moving
askew. These two sensors are arranged in a single row in front-rear direction. An original is
identified as moving askew if a discrepancy in timing is detected when it moves past these
sensors. If the discrepancy is an equivalent of 10 mm, the DADF will assume that the origi-
nal is moving askew, at which point it stops its operation to protect the original and causes
the copier to indicate a jam message.
10 mm or more
Skew sensor (S5)
Separation sensor (S4)
2-32
Original moving askew
Discrepancy detected in timing
F02-204-10
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON DADF-J1 REV.0 MAR.2001