REV.-A
2.2.8 Ribbon-feed Mechanism
The ribbon-feed mechanism consists of the ribbon cartridge and the ribbon-feed section. The
ribbon-driving gear is always driven counterclockwise (regardless of the timing belt direction) via the
gear trains shown in Table 2-8.
Table 2-8. Ribbon-Feed Gear Train
Direction of Movement of
Carriage
Gear Train
Left to right (arrow o)
Belt-driven pulley
-+ Platen gear (1)
+
Platen gear (2)
+
Ribbon-driving gear
Right to left (arrow
~)
Belt-driven pulley -+ Platen gear (1)
+ Platen gear (3)
--+
Platen gear (4)
Ribbon-driving
gear
Figure 2-51 shows the ribbon-feed mechanism. The inked ribbon is held in the cartridge case between
t>;
the ribbon-feed and the ribbon-pressure roller mounted on the ribbon-driving gear. The ribbon
configuration is such that the ribbon can feed endlessly.
The ribbon-driving gear drives the rollers, which causes the ribbon to be fed.
To prevent ribbon slack, a ribbon-breaking spring is attached at the exit of the cartridge case. A ribbon
mask is installed to prevent the ribbon from staining the paper.
Ribbon Feed Roller
b
Ribbon Pressure Roller=
\~
Ribbon Br
Ribbon Transmission Gear
~
f
Planet Gear
@,
Planei Gear
@
Ribbon Driving Gear _
$9
\\\\b
-#’@&$&T
“caking
Spring
Figure 2-51. Ribbon-Feed Mechanism
2-46
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