Specifications

REV.-B
2.1.4 Ribbon Advance Mechanism
The ribbon drive gear advances the ribbon through a gear linkage. This arrangement of gears makes
the ribbon drive gear always rotate in a counterclockwise direction,
regardless of the direction the
carriage is moving.
Table 2-2. Ribbon Advance Gear Linkage
Direction of Carriage
Movement
Left to right (arrow l )
Right to left (arrow 0 )
Gear Linkage
PULLEY, DRIVEN l Ribbon transmission gear I)
COMBINATION GEAR (1) l COMBINATION GEAR (3) N
COMBINATION GEAR (4) l RATCHET, RD
PULLEY, DRIVEN 0 Ribbon transmission gear 0
COMBINATION GEAR (1) 0 COMBINATION GEAR (2) 0
RATCHET. RD
The ink ribbon within the cartridge case is an endless ribbon that is held against the ribbon advance
roller by the pressure of the ribbon grip roller. The ribbon advance roller, linked to the ribbon drive gear,
winds the ink ribbon.
The ribbon brake spring, attached to the exit slot of the cartridge case, prevents slack in the ribbon
and keeps the ribbon tension correct. The ribbon mask keeps the paper clean by preventing the ribbon
from brushing against the paper.
Ribbon Feed Roller
c,
Ribbon Pressure Roller,
Ribbon Transmissi
SPUR GEAR,
VEN
COMBINATION GE
RATCHET, RD
.Ribbon
Spring
.riage
Brake
Figure 2-15. Ribbon Advance Mechanism