E–19Principles of Operation
Paper Transport System
The paper transport system accepts continuous, fan–folded, edge–perforated
paper from three to 16 inches wide and from one to six sheets thick.
Horizontal positioning is provided by the horizontal adjustment knob and
two tractors. The tractors are laterally adjustable along the splined shaft and
tractor support shaft. Each tractor engages paper perforations with six pins
and locks in place with a friction lock. During printing, the tractors are
driven by the splined shaft, which is belt–driven by the paper feed drive
motor. The paper feed drive motor is a two–phase step motor controlled by
the paper feed sections of the mechanism driver board and the paper feed
controller on the common controller board.
Paper may be manually advanced with the vertical adjustment knob.
Right Tractor
Vertical Adjustment
Knob and Splined Shaft
Pulley
Paper Feed T
iming Belt
(Under the cover)
Splined Shaft
Shuttle Cover Assembly
Tractor
Support
Shaft
Horizontal
Adjustment
Knob
Left Tractor
Figure E–10. Paper Transport System
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