Epson LQ-1070 Service Manual page 43

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
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.
PLATEN ;
Push-Pull Tractor Method
This is a combination of the push tractor and pull tractor methods. T
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.
PL
T
Paper (Continuous)
/
\ /
Figure 2-6. Pull Tractor Operation
Paper (Continuous)
Figure 2-7. Push-Pull Tractor Operation
TRACTOR ASSY.
SPUR GEAR, 16
WO
2-5
Gear
tractors are used, one in f
7
R, 40
Feed Motor
Gear
'rent
pull