Friction Separation System; Paper Transport Section; Paper Discharge Section - Canon SmartBase MPC600F Service Manual

3.2.2 Friction separation system

The friction separation system's paper separation method is explained below.
1. When the paper feed roller turns, the top sheet of the paper stack is taken to the nip where the
pressure roller contacts the paper feed roller.
2. When the top edge of the paper reaches the nip, the paper pushes down the pad by the amount of the
paper's thickness. At this point, since the frictional force between the paper and separation pad is less
than the frictional force between the paper and paper feed roller, the paper feed roller further transports
the paper into the machine.
3. At this time, the next sheet of paper stops at the chin.
4. If the next sheet of paper could not be stopped at the chin in step 3, it will be stopped on the
separation pad because the frictional force between the paper sheets is less than the frictional force
between the paper and separation pad. Only the top sheet is therefore sent into the machine.

3.2.3 Paper transport section

At the printing section, an unchanging gap between the paper and print head is maintained while the
paper is pressed against the platen as it goes between the pressure roller and paper feed roller and
between the spur and eject roller.
For paper transport control during printing, a metallic, high-precision paper feed roller having a coat of
ceramic paint and an optical encoder film affixed on it is used. The paper feed roller is driven by a DC
motor via a belt. The paper transport is controlled according to the signal read from the encoder film.
The paper is transported in 1/1440-inch increments.

3.2.4 Paper discharge section

While the sharp-tipped spur presses down the printed side of the paper (without marking the paper)
against the eject rollers, the eject rollers discharge the printed paper.
The paper discharge section consists of the eject rollers and spur. The sheet of paper brought to the
printing starting position is printed on as it goes around the platen. The paper is transported by the paper
feed rollers and pinch roller. When printing is completed, the paper is ejected by the eject rollers and
spur. A Spring tabs on the left and right keep the discharged sheets stacked properly.
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SmartBase MPC600F/MPC400 Chapter 2: Technical Reference
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