2.1.6 RibbonAdvance 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 gearis used in thegear linkage.
Table 2-4. Ribbon AdvanceGear Linkage
Direction of Carriage Movement Gear Linkage
Left to right
(indicated by the black arrow) Belt drivenpulley →Gear (1) →Gear (2)→
Ribbon driving gear
Right to light
(indicated by the white arrow) Belt drivenpulley →Gear (1) →Gear (3)→
Gear (4)→Ribbon driving gear
The ribbon brake spring, attached to the exit of the cartridge case, prevents slack in the ribbon and keeps the
ribbontension at anappropriate level. The ribbon maskprevents the ribbonfrom brushing against the paper.
Figure 2-21 RibbonAdvance Mechanism
Operating Principles FX-2170 ServiceManual
2-16 Rev.A