Overview; Printer Mechanism - Epson fx-2180 Service Manual

FX-2180 Service Manual

2.1 OVERVIEW

This printer consists of the printer mechanism, the power supply circuit, the
control circuit, operation panel, housing and etc,. The operating principles of
main components are described in this chapter as followings;

2.1.1 Printer Mechanism

The printer mechanism of this printer consists of following several unit;
Y
Printhead
The printhead prints the dots on the paper via ink ribbon by printing data
from the control circuit.
Y
Carriage mechanism
This mechanism consists of carriage unit, carriage motor (CR Motor),
timing belt, driven pulley, CR guide shaft and etc. The carriage unit
carries the printhead and move along the CR guide shaft between left
end and right end of the printable area by this mechanism.
Y
Platen gap mechanism
The platen gap (the gap between platen and printhead) are adjusted to
make good print quality between different thickness paper. This
mechanism consists of CR guide shaft, PG adjust bushing which
eccentric with CR guide shaft center, and PG adjust lever. It makes the
printhead associate with platen or keep away from platen causing from
PG adjust lever position.
Y
Paper feed mechanism
This mechanism consists of paper feed motor (PF Motor), rear / front
tractors, platen, and etc. This mechanism picks up the cut sheet paper ,
feed the cut sheet paper, or continuous paper to the printhead to print
paper by PF Motor. And, printed paper feeds out from the printer.
Y
Disengage mechanism
This mechanism consists of two disengage gears. It switches the paper
feed torque from PF motor to the tractors or paper feed rollers according
to paper feeding methods (ex. friction feeding, front push tractor feeding,
rear tractor feeding, pull tractor feeding, push-pull tractor feeding).
Y
Ribbon advance mechanism
This mechanism consists of ribbon feed roller, Driven pulley and etc.
This mechanism winds up ink ribbon for one way and make new ribbon
surface to appear for printing by carriage motion.
Rev. A
Rear Tractor
Platen
CR Guide Shaft
Printhead
Timing Belt
Driven Pulley
Ribbon Feed Roller
Ink Ribbon
Front Tractor
Figure 2-1. Printer Mechanism
Operating Principles
Disengage Gear 1
PF Motor
PG Adjust Bushing
Carriage Unit
CR Motor
Disengage Gear 2
2-1