Canon DADF-M1, Service Manual

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Chapter 2
2-39
2.5
Document Reversing
2.5.1 Basic Sequence of Operation
0002-9742
a. Picking Up the Original for Reading the 1st Side
The platen roller rotates using the drive from the feed motor (M2) for reading the 1st side
of the original. The machine keeps count of pulses from the feed motor to monitor the
movement of the original; and, before the trailing edge of the original leaves the platen
upstream roller, the machine drives the lock motor(M4) for a specific number of pulses to
move the platen upstream roller away (i.e., to prevent the impact otherwise occurring when
the trailing edge of the original leaves the roller). Moreover, before the trailing edge of the
original leaves the platen downstream roller, the machine turns on the delivery reversal
motor (M3) to discharge the original; likewise, it also turns on the release solenoid to lock
the delivery reversing roller in place. The machine accelerates the delivery reversal motor
when the trailing edge of the original leaves the platen downstream roller.
F-2-31
M2 M4
PI9
Read roller 2
Platen Roller
Read roller 1
Read roll 1
PI9
SL2
M3
Delivery reversal
upper roller
Delivery reversal low roller