Paper Feed Components - Canon SmartBase MPC600F Service Manual

SmartBase MPC600F/MPC400 Chapter 2: Technical Reference
3.2 Paper Feed Section

3.2.1 Paper feed components

The paper feed components include an ASF incorporating a friction separation system which uses a
separation pad. Compared to previous ASF systems, it has a very strong paper feed force.
It consists of the following parts: Paper feed roller and separation pad, pressure roller and return corner,
pressure plate, motor, and sensor.
Paper feed roller
(Transports
the paper)
Pressure roller
(Applies pressure on
the paper on the
separation pad to
prevent transporting
more than 1 sheet)
Separation pad
(Separates
the paper)
The motor is a constant-current stepping motor. It drives the paper feed roller with 1-2-phase driving.
There is a sensor on the paper feed roller to detect the paper feed roller's initial position.
The pressure roller and return corner prevent the paper that could not be completely separated by the
separation pad from proceeding to the paper transport section. The pressure roller presses down the
sheet of paper that is on the separation pad. It prevents multiple sheets from being transported. The
paper therefore has a back tension (counteracting force against the feed roller's pulling force on the
paper). Also, the return corner is for returning the paper remaining on the separation pad. The timing
for returning the paper changes depending on the paper type and length selected with the printer driver.
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Figure 2-6 Paper Feeding
2-8
Nip
Chin
Pressure plate
(Puts the next sheet
in position for the
paper feed roller)
Return pawl
(Returns the paper
remaining on the
separation pad)