Specifications
REV.-B
2.1.3 Paper Feed Mechanism
Cut sheet paper is advanced by friction feed. Continuous form paper is advanced using a tractor feed
mechanism.
There are three ways to advance the paper with tractor feed: using the push tractor, using the pull tractor,
and using the push and pull tractors together. Any one of these three tractor configurations can feed
paper through the printer. In normal operation, the printer is set up with one tractor, which functions
as either a push tractor or pull tractor, depending on where it is attached to the printer body. To use
the push-pull tractor feed method, an optional tractor must be attached in addition.
There are also four ways to insert paper into the printer. Different paper paths are used for different
types of paper. Table 2-l lists which paper paths can be used for each of the various paper advance
methods.
Table 2-1. Paper Advance Methods and Paper Paths
Paper Insertion (Paper Paths)
Paper Advance
Method
Friction
Feed
Push
Tractor
Pull
Tractor
Push-pull
Tractor
Feed
Rear Front
Entrance
Entrance
No OK
OK
No
No
OK
OK
No
Bottom
Entrance
No
No
OK
No
Top
Entrance
OK
No
No
No
2.1.3.1 Paper Advance Mechanisms
This section describes how the friction feed and tractor feed mechanisms work to advance the paper
in the printer.
Friction Feed Method
The paper is held between the platen and paper advance roller, and between the paper eject roller and
paper eject unit cover. The paper-feed pinion gear, turning in the direction of the black arrow, drives
the COMBINATION GEAR, 8.5, 30. The COMBINATION GEAR, 8.5, 30 turns the SPUR GEAR, 34,
paper-feed rollers, and top ROLLER ASSY., PAPER EJECT. The paper then advances in the direction of
the white arrow.
The paper advance roller spring holds the paper against the platen. Setting the LEVER, G, ADJUST to
the tractor feed position releases this pressure and frees the paper. Figure 2-4 illustrates friction feed
when paper is inserted through the top entrance.
ROLLER ASSY., PAPER EJECT
,
.,/‘l
, Paper (Cut Sheet)
/
PLAT
COMBINATION GEAR,
8.‘5,
30
/
-
Paper Feed Motor Pinion Gear
MOTOR, PF
Figure 2-4. Top Path Friction Feed
2-3
I