Epson FX-2170 Service Manual page 58

4. Push-Pull Tractor Method
The push-pull tractor method is a combination of the push and pull tractor methods. Two tractors are used to
advance the paper: one at the front paper entrance and the other at the rear paper entrance. They operate
simultaneously to push and pull the paper through the printer mechanism. Figure 2-9 illustrates push-pull
tractor operation when paper is fed through the rear paper entrance. Figure 2-10 illustrate push-pull tractor
operation when paper is fed through the front entrance.
Figure. 2-9 Push-Pull Tractor Operation Using the Rear Paper Entrance