iDP-3221 Service Manual
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7
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CITIZEN
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The following describes the basic mechanisms of the printer and how the printer operates, for the
following blocks.
• Power transmission and paper feed mechanism
• Platen roller attaching/detaching mechanism
• Sensor mechanism
• Print head mechanism
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As the motor runs, its force is conveyed via the motor gear (mounted on the motor shaft) to the
platen gear, which rotates the platen roller. At its ends, the platen roller is pressed by the head
springs against the thermal elements on the thermal head.
When thermal paper is inserted between the platen roller and the thermal head, the rotation of
the platen roller feeds the paper, which is delivered to the paper outlet.
Motor
Platen Roller
Platen Gear
Motor Gear
Thermal Head
Paper
Platen Roller
Thermal Elements
Thermal Elements
Thermal Head
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