Specifications

REV.-B
Pull Tractor Method
Using pull tractor feed to advance the paper is basically the same as using push tractor feed. In push
tractor feed, the TRACTOR
ASSY. (paper advance mechanism) is before the paper entrance. It pushes
the paper through the PRINTER
MECHANISM. Puil tractor feed, however, has the opPosite arran9ementl
with the tractor situated after the paper entrance.
Since it pulls the paper through the PRINTER
MECHANISM, it requires no paper tension unit. Figure 2-6 illustrates pull tractor operation tractor when
paper is inserted through the bottom path.
Paper (Continuous)
/
\
o
TRACTOR ASSY.
PLATEN
;
\/
SPUR GEAR,
16
Gear
COMBlNATK3N GEAR, 8.5, 30
Figure 2-6. Pull Tractor Operation
Push-Pull Tractor Method
This is a combination of the push tractor and pull tractor methods. TWO tractors are used, one in f
of and one behind the paper entrance, to advance the paper. They act simultaneously to push and
the paper through the PRINTER MECHANISM. Figure 2-7 illustrates push-pull tractor operation.
Paper (Continuous)
PL
7
R, 40
Feed Motor
Gear
T
‘rent
pull
Figure 2-7. Push-Pull Tractor Operation
2-5