Canon DADF-B1 Service Manual page 27

CHAPTER 2 BASIC OPERATION
1. When the copier's Copy Start key is
pressed, the separation motor (M1) starts to
rotate counterclockwise. In response, the
lock used to keep the pickup roller in place
becomes disengaged, and the pickup roller
falls down on the original on its own
weight.
The work of a cam, on the other hand,
moves up the lifter and, consequently, the
original.
The separation
counterclockwise
for 250 msec and then stops to end ascent.
M1
Figure 2-214
2. When the pickup roller stops moving
down and the lifter stops moving up, the
separation motor starts to rotate clockwise
so that its rotation drives the separation
roller and the pickup roller, moving the
first original to the separation assembly.
M1
Figure 2-215
2-14
COPYRIGHT © 1999 CANON INC. CANON DADF-B1 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
motor rotates
3. A moment after the separation motor starts
to rotate clockwise, the lifter starts to move
down by the work of the cam.
Then, the pickup roller starts to move up
while rotating, returning to its initial
position.
M1
Figure 2-216
4. When the pre-registration sensor (U502)
detects the trailing edge of the original
(OFF), the separation motor starts to rotate
counterclockwise once again. In response,
the lock used to keep the pickup roller in
place becomes disengaged, and the pickup
roller falls down onto the original on its
own weight.
The work of the cam, on the other hand,
moves up the lifter to hold up the original.
M1
Figure 2-217