Ribbon Advance Mechanism - Epson LX-300 Service Manual

2.1.4 Ribbon Advance Mechanism

The ribbon is held between the ribbon advance roller (ribbon driven gear) and the ribbon pressure
roller. When the carriage moves on the CR guide shaft from left to right and vice versa, the timing
belt turns the belt driven pulley. Then the torque is transmitted to the ribbon driving gear through
the gear trains. The ribbon driving gear rotates counterclockwise no matter what direction the
carriage moves, because a planetary gear is used in the gear linkage.
Table 2-3. Ribbon Advance Gear Linkage
Direction of Carriage Movement
Left to right
(indicated by the black arrow)
Right to light
indicated by the white arrow)
The ribbon brake sprina attached to the exit of the cartridge case, prevents slack in the ribbon and
keeps the ribbon tension at an appropriate level. The ribbon mask prevents the ribbon from
brushing against the paper.
Ribbon
Gear Linkage
Belt driven pulley + Gear(1)+ Gear (2)+
Ribbon driving gear
Belt driven pulley + Gear(1) -+ Gear (3)+
Gear (4) + Ribbon driving gear
Operating Principb
Spring
2-7