Document Reversing; Basic Sequence Of Operation - Canon DADF-M1 Service Manual

2.5 Document Reversing

2.5.1 Basic Sequence of Operation

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.
b. Reversing/Feeding the Original 1
The delivery reversal motor (M3) stops when the trailing edge of the original moves past the delivery reversal sensor (PI9); immediately thereafter, the delivery
reversal motor (M3) starts to rotate in reverse so that the original will arch against the No. 2 registration roller. At the same time, the locking solenoid goes off to
move the delivery reversing roller away.
M4 M2
PI9
Platen Roller
Read roller 1
Read roll 1
Delivery reversal
upper roller
PI9
Delivery reversal low roller
M3
Delivery reversal
upper roller
PI9
Delivery reversal lower roller
M3
No. 2 registration roller
PI9
Delivery reversal lower roller
Reversing roller
Read roller 2
M3
F-2-31
F-2-32
Chapter 2
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