operating
Principles
LQ-300
Service Manual
Push - Pull Tractor Method
The push-pull tractor method is a combination of the push method, using the standard tractor, and
the pull method, using an optional tractor. The two tractors operate simultaneously to push and
pull the paper through the printer mechanism. Figure 2-6 shows push-pull &actor operation when
the paper is fed through the rear paper entrance.
t
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.
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-.,.
.
b
-
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Figure 2-6. Push-Pull Tractor Paper Advance Mechanism
Disengage Lever
The disengage lever switches whether or not the printer transmits the torque of the PF motor to the
tractor transmission gear. (See Figures 2-5 and 2-6.)
The paper path is different from friction feed and tractor feed. The PF driven roller is not in the
tractor feed paper path, so continuous paper is not advanced by this roller. Figure 2-7 shows the
paper path.
Sheet
Guide
,>
Cut Sheet
.
Platen
QY
Continuous paper
\
<&Tractor
/
PE Sensor Assembly
PF Driven Roller
Figure 2-7. Paper Path
2-6
Rev.A
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