Service manual

2-8 Mechanism Configuration and Operating Principles Rev. B
Confidential
Ribbon feeding
When the carriage motor rotates forward and the carriage motor gear rotates in the direction of
arrow A, the ribbon intermediate gear and ribbon drive gear rotate in the directions of arrows B
and C, respectively. This causes the ribbon drive plate to move in the direction of arrow D, with
the ribbon intermediate gear shaft in the center, until the ribbon drive gear engages the ribbon
transmission gear.
Since the ribbon transmission gear and the ribbon take-up gear are always engaged, the ribbon
take-up gear rotates in the direction of arrow E.
When the carriage motor rotates in the reverse direction and the carriage motor gear rotates in
the direction of arrow F, the ribbon drive plate moves in the direction of arrow G, disengaging
the ribbon drive gear from the ribbon transmission gear.
Therefore, the ribbon take-up assembly rotates in the direction of arrow E only when the
carriage motor rotates forward. Then the ribbon feed and ribbon hold rollers in the ribbon
cassette, which are engaged with the ribbon take-up assembly, rotate and the ribbon is fed.
Figure 2-10 Ribbon feeding
Carriage motor gear
Ribbon intermediate gear
Ribbon take-up
Ribbon take-up
Ribbon transmission gear
gear
assembly
Ribbon drive
gear
F
A
C
B
G
D
E
Ribbon feed roller
Ribbon drive
plate