Ribbon Advance Mechanism - Epson FX 1170 - B/W Dot-matrix Printer Service Manual

REV.-A

Ribbon Advance Mechanism

2.1.4
The ribbon is held between the ribbon advance roller (ribbon driving gear) and the ribbon pressure roller. ' " "
When the carriage moves ontheshaft, the timing belt turns the belt driven pulley, andthetorque is transmitted
to the ribbon driving gear through the train of gears. The ribbon driving gear rotates counterclockwise no
matter what direction the carriage moves, because the planetav gear is used in the gear linkage.
Direction of Carriage Movement
Left to right
(indicated by the black arrow)
Right to left
(indicated by the white arrow)
The ribbon brake spring, attached to the exit slot 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 Advance Roller \
Ribbon Pressure Roller
Gear
Gear (2)
Ribbon
D r i v i n g G e a r ,
Table 2-2. Ribbon Advance Gear Linkage
Belt driven pulley
Ribbon driving gear
Belt driven pulley @ Gear (1) O Gear (3) 0
Gear (4) 0 Ribbon-driving gear
Ink Ribbon
.
\
0
o
Figure 2-21. Ribbon Advance Mechanism
2-18
Gear Linkage
Gear (1) Gear (2) ~
Mask
i...
Brake
ge