Epson Stylus Pro 5000 Service Manual page 43

Stylus Pro5000
[Paper Feeding From the Optional Cassette]
Although inside of the optional cassette is composed of same parts as you
can find in the standard cassette, there is some distance from the optional
cassette to the standard cassette. Therefore, paper load roller for optional
cassette mounted on the printer becomes impossible to pick up the tip of
the paper correctly in case of relatively short paper and paper type, which
rolls back, and causes paper jam. Therefore, paper type that can be used
for optional cassette is limited.
[Paper Feeding from Front Manual Feed Slot]
1. When the user insert a paper directly from the manual feed slot, the
heading tip of the paper motivates P sensor(1), then, stops by colliding
with edge of PF support roller. This sensor is in charge of detecting the
heading tip of the paper in both cases, paper feeding from the front
manual feed slot and from the standard cassette.
2. When this P sensor(1) works, the printer enables the sub roller to rotate
without rotating the paper load roller, and carry the paper with friction
between sub roller and paper support roller(1) up to the point that the
heading tip of the paper can be completely hold.(Actually, the paper is
fed only a few mm) Also, in case of front manual feeding, since the
distance between the paper setting positing and P sensor(1) is very
long, relatively short paper becomes impossible to make its heading tip
to touch with this sensor. Therefore, like the optional cassette, paper
size for using the front manual feed slot is limited.
3. After that, the printer rotates the sub roller again by inputting the printing
command, and carries the paper's heading tip to the platen quickly.
4. When the paper is carried to the platen, the paper is fixed completely by
the friction between powder coated roller(paper feed roller) and support
roller, and also between sub roller and PF support roller. As s result, the
printer tries to release the friction between the sub roller and PF support
roller(1), and to prevent kick back at the end of printing operation.
Rev. A
[Paper Feeding from Rear Manual Feed Slot]
In case of paper feeding from rear manual feed slot, exclusive PR sensor
is mounted. This sensor enables the printer to carry the paper to the inside
of the printer in the same process as front manual feeding does but without
driving the paper load roller. Refer to "Paper Feeding from Front Manual
Feed Slot" for the rest of operations. If you select this paper path, since
paper loading is almost straight loading, the printer supports paper sizes
from A6 to 22 inches, as it is mentioned in the specification.
Chapter2 Operating Principles
2-6