Upper Surface Sensor Mechanism - Epson Stylus Pro 5000 Service Manual

Stylus Pro5000

2.1.1.4 Upper Surface Sensor Mechanism

As printing operation goes on, of course, the number of paper in the paper
tray decreases. Unlike the previous ink jet printer models, since the lifter
supports the hopper directly in the Stylus Pro5000, if the height which this
lifer rises is always constant, the credibility of paper loading decreases by
the change of the paper volume in the paper tray. In order to avoid this
symptom, the Paper Load Roller itself moves up and down with its axis.
Figure 2-5. Transition of Paper Load Roller Unit Condition at Paper
Rev. A
Loading
[Explaining the operation]
As it is shown in the figure 2-5, since the lifter does not rise at the waiting
mode, the hopper in the paper tray does not contact with the Paper Load
Roller. After the printer receives the printing order, the lifter rises up for
paper loading and the hopper is also pushed up together. When the flag
which is fixed to the unit reaches the upper surface sensor, C228 main
control board stops the rotation of the gear train so that the lifter does not
keep rising up any more. Also, this timing to stop the rotation of gear sets
the best height for Paper Load Roller to pick up the top paper from the
paper pile.
Chapter2 Operating Principles
2-7