Ribbon Advance Mechanism - Epson LQ-1170 Service Manual

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.
Direction of Carriage
Movement
Left to right (arrow O )
Right to left (arrow Q )
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
Planet Gear. #—
Table 2-2. Ribbon Advance Gear Linkage
Belt-driven pulley O Ribbon transmission
Planet gear (1)
Ribbon-driving
Belt-driven pulley O Ribbon transmission gear ~
Planet gear (1) ~ Planet gear (2) ~ Ribbon-driving gear
Figure 2-15. Ribbon Advance Mechanism
2-11
Gear Linkage
gear
Planet (3) * planet 9ear (4)
gear
ke
iage