Oki Microline 520 Service Handbook page 105

Continuous Paper Feed (Bottom Tractor
Feed Mechanism)
As the platen rotates, power is
transferred to the drive gear from the
platen gear, the idle gear and the tractor
change gear. The drive gear turns the
pin tractor belts on the bottom tractor
feed unit, which feeds the continuous
paper.
Continuous Paper Feed (Push/Pull Tractor Mechanism)
This mechanism consists of an
optional pull tractor and a standard
push tractor mechanism.
Continuous paper is fed by these two
tractors at the same time.
Microline 520/521 Service Handbook
P/N 59257803
2 - 33
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Principles of Operation