Document Reversing; 1Basic Sequence Of Operation; Basic Sequence Of Operation - Canon DADF-M1 Service Manual

Chapter 2

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.
Read roll 1
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.
2-34
M4 M2
PI9
Read roller 2
Platen Roller
Read roller 1
M3
Delivery reversal
upper roller
PI9
Delivery reversal low roller
F-2-31
0002-9742