Canon DADF-R1, Service Manual

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Chapter 3
3-20
3.4.2 Moving Up/Down the Pickup Roller Unit
0013-3479
A. Outline
The DADF is equipped with two pickup roller units, each designed to move up/down between home position
and the surface of the stack of originals. The pickup roller unit is moved up/down by the pickup motor (M3).
The pickup roller unit stops at either of the following positions; positioning is controlled by means of pulses
from sensors and the pickup motor.
T-3-8
F-3-22
Stop position Operation Related sensor (notation)
Home position Waits until the next copying operation. Pickup roller home position sensor (PI7)
Wait position Waits until the next pickup position Pickup height sensor 1/2 (PI8/9)
Pulse control of pickup motor (M3)
Pickup position Picks up originals Pickup height sensor 1/2 (PI8/9)
Pulse control of pickup motor (M3)
Home position Escape position Pickup position
M3
PI 9
PI 8
PI 8/9
PI 7
PI 7
Pickup roller units
Separation unit