Paper Feed Mechanism; Friction (Sheet) Feed; Tractor (Continuous) Feed - OKIDATA Pacemark 3410 Service Handbook

2.2.04

Paper Feed Mechanism

Paper feeding is performed by turning the platen and the tractors, which are driven by the line
feed pulse motor.
The paper feed mechanism consists of the items listed below.
Line Feed (Pulse) Motor with gears
Idle Gear
Change Spring
Change Gear
Platen
Push Tractor Assembly
Bottom Tractor Feed Unit
Paper Pressure Guide

Friction (Sheet) Feed

When the release lever is set to the
SHEET FEED position, the change gear is
disengaged from the tractor gear. At the
same time, the release lever applies
pressure to push the pressure rollers
against the platen, allowing paper to be
fed.
A photosensor located in the paper
pressure guide detects PAPER END.

Tractor (Continuous) Feed

When the Release Lever is set to the
TRACTOR FEED position, the release
lever allows the reset spring to push the
change gear toward the tractor gear. At
the same time, the release lever pushes the
pressure rollers away from the platen,
allowing paper to be fed by the tractors.
The microswitch on the push tractor (rear
feed) and the paper end sensor on the
sensor board (bottom feed) detect PAPER
END.
Principles of Operation
Paper Pressure Guide
Line Feed Motor
Tractor Feed
Unit
2 - 16
Platen
2-7.pcx
Change Gear
Change
Spring
Idler Gear
2-8.pcx
Pacemark 3410