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3.3.2 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
printer.
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 printer.
3.3.3 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.
3.3.4 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.
Part 3: Technical Reference
S600
3-18