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
— 33 —
Summary of Contents for UP-250
Page 1: ...EXTERNAL PRINTER FEB 2000 MODEL UP 250 without price TECHNICAL MANUAL ...
Page 95: ... 86 END END Yes No Action 4 Replace main PCB Replace printer OK Action 4 mechanism assembly ...
Page 136: ... 127 ...
Page 149: ... 140 Main Circuit Board Parts Layout ...
Page 150: ... 141 RS 232 Serial Interface Circuit Board Parts Layout ...
Page 151: ... 142 IEEE 1284 Parallel Interface Circuit Board Parts Layout ...
Page 152: ...RS 485 Serial Interface Circuit Board Parts Layout 143 ...
Page 160: ... 151 Case Unit Lubrication Points Diagram 4 G 31 4 G 31 3 G 31 3 G 31 ...
Page 163: ... 154 EXPLODED DIAGRAM FOR TM U200B U210B NO 1 ...
Page 164: ... 155 EXPLODED DIAGRAM FOR TM U200B U200PB U210B U210PB NO 2 ...