Paper Transport System
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Paper Transport System
Figure 52. Paper Transport System
A two-phase DC stepper motor, directed by the engine controller (EC), drives
two tractor sprockets by means of a toothed belt and splined shaft pulley. The
stepper motor permits extremely accurate incremental vertical paper
movement. This drive configuration is designed for continuous, fan-folded
paper three to 17 inches wide and one to six sheets thick. For reverse paper
feeding, the platen motor opens and closes the platen via a toothed belt.
Opening the platen prevents paper jams when paper direction is reversed
(moved downwards) after viewing the print area, setting top of form, or
allowing applications to overprint forms.
Paper is positioned horizontally using the tractors. Each tractor is locked in
position with a friction lock and engages the paper perforations with six
sprocket pins. The horizontal adjustment knob allows vernier positioning of
the left print margin.
The vertical adjustment knob is used to position paper vertically by hand.
Paper Supports
Shuttle Cover
Assembly
Tractor
Support Shaft
Tractors
Paper Path
Splined
Shaft
Vertical
Adjustment
Knob and
Splined Shaft
Pulley
Paper Feed Timing
Belt (under the cover)
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