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Service Guide ML520/521
Chapter 2 Principles of Operation
Continuous Paper Feed (Pull Tractor Mechanism)
Bottom feed of continuous sheets is possible only when an optional pull tractor unit is installed.
As the platen rotates, power is transferred to the drive gear from the line feed idler gear, the platen gear, idler gear B and idler gear A. The drive gear turns the pull tractor assembly, which feeds the continuous paper.
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