Canon DADF-N1, Service Manual

Page: 52 / 199

Chapter 2
2-30
2.4.2 Pickup Roller and the Stopper
0006-2264
The pickup unit consists of pickup rollers and separation rollers.
1) When the Start key is pressed or the original pickup signal arrives, the pickup motor (M2)
rotates in reverse so that the pickup unit moves down so that the pickup roller and the
separation roller start to move the original. The stopper moves up operating in conjunction
with the pickup unit. To prevent double-feeding at time of pickup, the machine uses the
separation pad and the separation plate.
When the original reaches the registration roller and arches, the pickup motor starts to rotate
to drive the registration roller, which will then move the original forward. At this time, the
drive from the pickup motor to the separation roller is cut by the work of an electromagnetic
clutch. The separation roller has a built-in one-way cultch, which serves to rotate the roller
by the work of friction against paper.
2) At the end of a job, the pickup motor starts to rotate in normal direction; drive A (not
moving through the electromagnetic clutch) and drive B (moving through the
electromagnetic clutch) reach the separation roller shaft to move up the pickup roller to its
upper limit.