Canon DADF-M1 Service Manual page 52

Chapter 2
b. Aching the Original
When the original has been moved for a specific number of pulses after the registration
sensor has gone on, the original is caused to arch at the No. 1 registration roller so that it
becomes free of any skew.
No. 1 registration roller
Registration sensor
Arching
M1
F-2-24
c. Sheet-to-Sheet Distance
While the original is between the No. 1 registration roller and the No. 2 registration roller,
its movement is accelerated so that there will be a sheet-to-sheet distance at the time it
reaches the No. 2 registration roller for reading. The normal rotation maximum speed of the
pickup motor is 750 mm/sec; it decelerates to reading speed at a point 23 mm in front of the
No. 2 registration roller to move the original to the No. 2 registration roller.
d. Moving the Original
The pickup clutch goes off and the pickup motor rotates in normal direction to move the
original. The lock motor is driven for locking before the leading edge of the original reaches
the platen upstream roller (thereby preventing the shock otherwise occurring when the
trailing edge of the original leaves the roller). When the original reaches the point of
deceleration before reading, the machine checks whether the READY signal is on, in which
case it will move the original ahead to the point of reading; if the signal is off, the machine
keeps the original in wait for reading. (In the case of the 1st original, the machine moves it
as far as the read sensor at 650 mm/sec.)
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