movable blade drive pin in direction E to make the blade execute a cut. If the motor continues
rotating, the wormwheel makes one rotation and it makes the movable blade return to the
standby position and the cutting is finished.
Figure 2-14 Auto-cutter mechanism
Ribbon Switch Mechanism Unit
The ribbon switch mechanism unit consists of the carriage motor assembly, carriage sub assembly,
tension plate assembly, tension belt pulley, home position detector assembly, ribbon frame assembly,
ribbon frame spring, ribbon switch lever, ribbon release lever, and ribbon release spring.
The mechanism unit is placed at the left and right of the carriage sub assembly, whose position is
controlled by the number of carriage motor steps, using the home position as the reference position.
It switches between the black and red ribbon in the ribbon switch and ribbon release areas outside the
printing area.
Switching from Black to Red
When the carriage, sub assembly (print head unit) moves in direction E and reaches the ribbon switch
area, the ribbon switch lever is pushed by the ribbon switch section and moved to position A (shown by
the dotted lines). The ribbon assembly frame is pushed upward by the push face for the ribbon frame.
The detent face for the ribbon switch falls into the ribbon switch lever hole in the ribbon frame assembly
and the ribbon frame assembly is set to the red position.
Releasing from Red to Black
When the carriage sub assembly moves in the D direction and reaches the ribbon release area, the
ribbon release lever is pushed by the ribbon release section. Then portion C pushes theribbon frame
assembly upward. At this time, the detent face for the ribbon switch is released from the ribbon switch
lever hole in the ribbon frame assembly and the ribbon switch lever is returned to ribbon switch lever
position B (shown by the solid lines) by the spring power of the
Wormwheel
Movable blade drive pin
Slot D
Arm
Wheel pin
Movable blade
— 36 —
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 ...