REV.-A
2.1.4 Ribbon Advance Mechanism
The ribbon drive gear advances the ribbon through a gear linkage. This arrangement of gears always
turns the ribbon drive gear counterclockwise, regardless of the direction in which the carriage is moving.
Table 2-2. Ribbon Advance Gear Linkage
h
I
(
Direction of Carriage
Movement
Gear Linkage
Left to right (arrow
O
)
Belt-driven pulley
O
Ribbon
transmission
9ear
●
Planet gear (1) ● Planet gear (3)
*
planet
9ear
(4) ●
Ribbon-driving gear
Right to left (arrow
Q )
Belt-driven pulley
O Ribbon transmission gear
~
Planet gear (1)
~
Planet gear (2)
~
Ribbon-driving gear
The ink ribbon within the cartridge case is an endless ribbon. The pressure of the ribbon grip roller
holds the ribbon against the ribbon advance roller. The ribbon advance roller is linked to the ribbon
drive gear and winds the ink ribbon. The ribbon brake spring is attached to the exit slot of the cartridge
case. It prevents slack in the ribbon and maintains the correct ribbon tension. The ribbon mask keeps
the paper clean by preventing the ribbon from brushing against the paper.
&
Ribbon Feed Roller
NRnpress”re
\wm
l!!)
Planet Gear.
#—
ke
iage
Figure 2-15. Ribbon Advance Mechanism
2-11
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