Ribbon Advance Mechanism - Epson 2070 - LQ B/W Dot-matrix Printer Service Manual

Operation Principles

2.1.6 Ribbon Advance Mechanism

The ribbon is held between the ribbon advance roller (ribbon driven gear) and the ribbon pressure roller.
When the carriage moves from left to right and vice versa on the CR guide shaft, 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.
Direction of Carriage Movement
Left to right
(indicated by the black arrow)
Right to light
(indicated by the white arrow)
The ribbon brake spring, 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.
Figure 2-21 Ribbon Advance Mechanism
2-16
Table 2-4. Ribbon Advance Gear Linkage
Gear Linkage
Belt driven pulley → Gear (1) → Gear (2) →
Ribbon driving gear
Belt driven pulley → Gear (1) → Gear (3) →
Gear (4) → Ribbon driving gear
LQ-2070 Servcie Manual
Rev.A