Epson LQ-2550 Technical Manual page 62

1. Outline
The color-inked ribbon is divided into four strips as shown in Figure 2-12. One strip can be
by vertically moving the color ribbon cartridge using point A of the carriage as a fulcrum.
Carriage – —
2. Operations
The rotation of the CS motor is converted into vertical motion of the CS rod via the CS transmission
gear and CS drive gear, and moves the color ribbon cartridge up or down. The cartridge location spring
at the rear of the cartridge pushes the ribbon cartridge against the CS rod via the cartridge location
pin to firmly hold the ribbon cartridge.
The next color strip on the ribbon cartridge is selected by the CS motor rotating 40 steps from Color
select home position (point C). (Refer to Figure 2-13 (b).) When the black ribbon cartridge is mounted,
the bottom of the ribbon cartridge touches projecting part A of the carriage.
This keeps the bottom of the black ribbon cartridge away from the CS rod during
movement, and defeats the color select mechanism operation.
The cartridge location spring at the rear of the ribbon cartridge pushes the ribbon
the projecting patt A of the carriage via the cartridge location pin to firmly hold the
(Refer to Figure 2-1 3(a).)
Carriage
Cartridge Location Spring
CS Unit
(a) When a black ribbon is used
Color Ribbon Cartridge
— - - – — - -
Down
Figure 2-12. Color Ribbon Strip Selection
Black Ribbon Cartridge
. .
L..
Figure 2-13. Color Select Mechanism
2 - 1 5
[Selected Color]
6.075 . . . . Yellow
- — P r i n t i n g P o i n t
W - - -
Color Ribbon Cartridge
CS Rod
(b) when a color ribbon is used
REV.-A
selected
its up and down
cartridge toward
ribbon cartridge.
Black
Cyan
Magenta
Yellow
(Cross section)