22 December 1998
SCANNER MECHANISMS
2-11
Detailed
Descriptions
Original Feed and Separation
To feed the original, the paper feed motor and the paper transport motor (which
drives the paper transport drum) turn on. The paper feed motor drives the pick-up
roller [A] through a train of gears and the pick-up clutch [B]. The pick-up clutch
turns on to feed the top sheet of the original. If the pick-up roller feeds multiple
pages of the original, the separation roller [C] and the feed roller [D] separate these
pages (the separation mechanism is friction-based).
When the leading edge of the original activates the feed sensor [E], the paper feed
motor and the pick-up clutch turn off, then the paper transport drum [F] feeds the
original to the scanning position.
Image Scanning
The scanner starts to scan the image when the leading edge has passed the read
sensor by a certain distance (measured by motor pulses).
When the CPU has fed the trailing edge of the original 30 mm past the feed-out
sensor, the transport motor turns off.
G411D520.WMF
[C]
[E]
[F]
[D]
[A]
[B]
