Service manual

Principles of Operation
Ribbon Feed Mechanism
The ribbon feed mechanism consists of the ribbon cartridge and the ribbon feed
section. Table 2-10 describes the ribbon feed gear train. Regardless of the timing
belt direction, the gear train setup assures that the ribbon driving gear rotates
only counterclockwise.
Table 2-10. Ribbon Feed Gear Train
Figure 2-53 shows the ribbon feed mechanism. The ink ribbon is an endless loop
partly contained in the cartridge case. It is held between the ribbon feed and
ribbon pressure rollers mounted on the ribbon driving gear. The gear’s movement
drives these rollers, which in turn feed the ribbon.
To prevent ribbon slack, a ribbon braking spring is attached at the cartridge case
exit. A ribbon mask prevents the ribbon from staining the paper.
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LQ-2OO/AP3000