Service manual

REV.-A
(4) push-pull Tractor Method
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A,
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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 2-8 illustrates push-pull
tractor operation when the paper is fed through the rear paper entrance. Figure 2-9 illustrates push-pull tractor
operation when the paper is fed through the front entrance.
Paper (Continuous)
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Pull Tractor
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Push Tractor
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Yii!ifx,pushTractorGear
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Tractor Reduction Gear
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PF Motor Pinion Gear
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klotor, PF
Paper Advance
Reduction Gear
Figure 2-8. Push-Pull Tractor Operation Using the Rear Paper Entrance
2-1o