Paper Feed Mechanism - Epson Stylus Pro 5000 Service Manual

Stylus Pro5000

2.1.1.3 Paper Feed Mechanism

There are 4 paper feed paths in the Stylus Pro5000; 1) Standard Paper
Tray, 2)Optional Paper Cassette, 3)Front Manual Feed, 4)Rear Manual
Feed.
Following figure shows the paper feed path from the standard paper tray.
In case of the rest of other paper feed paths, the same operation is done,
except a point that the Paper Load Roller does not rotate.
Figure 2-4. Paper Feed Path
Rev. A
P E S e n s o r
[Paper Loading from the Standard Paper Tray]
1. While the printer is turned on, Papers in the tray are always monitored
by 3 sensors; Left Quantity Sensor, Paper size sensor and Paper type
sensor.
2. When the printing command is input from the PC, the paper load roller,
which is at the waiting mode, rotates half circle towards left direction
and stops once in this position.
3. While the Paper Load Roller maintains this position, the lifter pushes up
the hopper in the paper tray. This makes the paper on the hopper up.
(Refer to "Lifter Gear Train Mechanism")
4. At this time, when the Upper surface sensor detects THLD(THLD value:
almost On or Off condition) by the Paper Pick Up mechanism, lifter
operation is stopped. (Refer to "Paper Pick Up Mechanism")
5. By rotating the Paper Load Roller again, the top paper on the paper pile
is separated, and picked up from the rest of the other papers on the
separation pad.
6. While the top paper is separated from the other papers, the credibility of
this paper separation is improved, and also the problem that the paper
edge is bent or folded at the skew removal operation can be avoided by
moving the hopper 5mm down. (Refer to "5mm Down Mechanism") The
skew removal operation is to correct the skew part by colliding the
loaded paper to the surface of PF Support Roller(1).
7. The head edge of the loaded paper is collided to the edge of the PF
Support Roller for skew removal.
8. Sub roller is rotated and the loaded paper is transported to the printing
start position.
9. When the Step 8 operation is completed, the Paper Load Roller returns
to the waiting mode.
10. Lifter returns down and hopper returns to the waiting position. (Refer to
"Lifter Gear Mechanism")
Chapter2 Operating Principles
2-5