iDP-3221 Service Manual
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8
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CITIZEN
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The platen roller in the paper feed mechanism is removable from the printer. The platen roller
is built as a unit consisting of the platen gear, platen bushes, and platen lever L and R. When
this unit is set on the U-shaped brackets of the chassis, the platen gear engages with the motor
gear. The platen is brought into contact with the thermal head, as it is pressed by the head
springs which each have one end anchored to the hook of the chassis.
The movable end of each head spring can be released from the hook on the chassis to remove the
platen roller.
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The paper sensor detects the presence of paper just
before the thermal head. Only when this sensor
detects paper, does the thermal head is energized,
because otherwise the thermal head may be damaged
or its life seriously affected. The sensor also works
in automatic paper loading to determine whether
paper is inserted or not. (The paper sensor is built
on the thermal head.)
Platen Bush
Platen Roller
Platen Roller (Platen Roller Unit)
U-Shaped Bracket
Hook
Platen Lever L
Platen Lever R
Platen Gear
Head Spring
Motor Gear
Thermal Head
Platen Roller
Paper
Paper Sensor
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