Canon DADF-B1 Service Manual page 25

CHAPTER 2 BASIC OPERATION
1. Starting Ascent (pre-separation)
When the separation motor (M1) rotates
counterclockwise, the lifter moves up to hold
up the entire stack of originals from under,
while at the same time the pickup roller moves
down onto the stack to hold it in place.
The separation
counterclockwise for 250 msec and then stops.
Figure 2-209
2. Pickup/Separation Operations
When the separation motor (M1) rotates
clockwise, its drive reaches the pickup roller
and the separation roller and, as a result, the
first (topmost) original is picked up. The
separation pad is used to make sure that only
one original is separated and moved to the
registration roller.
At the end of this operation, the lifter starts
to move down, and then the pickup roller
moves up.
Figure 2-210
2-12
COPYRIGHT © 1999 CANON INC. CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
motor rotates
3. Arching
The original is butted against the
registration roller, and is made to arch. The
separation roller stops to rotate 52 msec after
the pre-registration sensor (U502) detects the
leading edge of the original.
Figure 2-211