Paper Feed; Figure 5.5 Paper Feed Path - Digital Equipment LA30 N Service Manual

5.2.4 Paper feed

Paper is fed by the 4-phase paper feed motor (LF motor) on the left side of the frame which rotates the platen
and operates the tractor unit.
The LF motor gear transmits power to the platen gear through idle gears A and B.
When the tractor unit is installed at the rear of the printer for use as a push tractor, the paper select lever is set
toward the back of the printer (continuous forms side). With this setting, power is also transmitted to the tractor
gear through idle gear C because this gear shifts along its shaft and engages both gear B and the tractor gear.
When the tractor unit is installed on the top of the platen for use as a pull tractor, the platen gear transmits power
to the tractor gear through idle gear D. This power transmission is valid regardless of setting of the paper select
lever, but the paper select lever must be set toward the back of the printer when the tractor unit is used as a pull
tractor.
Continuous forms are fed by both the tractor unit and the platen. Cut sheets are fed by the platen only. These
operations are explained in the sections that follow, together with autoloading/unloading and paper end detec-
tion.
Tractor (PULL)
Tractor gear
Platen roll
Platen gear
Gear D
Gear A
LF motor gear
Gear C
Tractor (PUSH)
Gear B
Tractor gear
Figure 5.5 Paper feed path
5-5