Printronix P9212 - Paper Feed Control

2–42
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.
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 controller board.
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
(under paper guide)
1
Figure 2–24. Paper Feed Components