The sprocket pins on the tractors fit into the holes along the edge of the
paper.
The flip-up covers on the tractor, clamps the paper in place over the pins.
With each new line, the tractor wheel rotates, making the paper move
through the printer.
Paper supports, which can be adjusted left or right, guides the paper out
of the printer.
The tractor unit can be in either Push or Pull position to accommodate
different types of paper.
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