Specifications

2–32
Principles of Operation
Paper Feed Control
The paper transport system accepts continuous, fan–folded, edge–perforated
paper from three to 16 inches wide and from one to six sheets thick. (See
Appendix F for precise paper specifications.) Horizontal positioning is
provided by the horizontal adjustment knob and two tractors. The tractors are
laterally adjustable along the splined and support shafts. Each tractor engages
paper perforations with eight pins and locks in place with a friction lock.
During printing, the paper feed motor drives the splined shaft with a toothed
belt. The splined shaft drives the tractors. 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 CCB.
Paper is manually advanced with the vertical adjustment knob.
Paper Feed Motor
Tractors
Horizontal
Adjustment
Knob
Vertical
Adjustment
Knob
Support
Shaft
Splined
Shaft
Friction
Lock
Figure 2–20. Paper Feed Components