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2. CONSTRUCTION
2.1 Configuration
The unit printer mechanism is constructed of the following components:
2.2 Principle of Operation
2.2.1
Drive and paper feed
The rotation of the stepping motor is transmitted to the gear, which turns the platen. The rota-
tion of the platen generates friction between it, the thermal paper and the thermal head, there-
fore causing the paper to be fed.
2.2.2
Printer
Color appears on the thermal paper as the temperature of the thermal head’s heat-generating
element increases.
2.2.3
Presenter
The edge of the thermal paper stops just before the presenter’s ejector, the continuous feed of
the thermal paper creates a loop and after printing is finished, the paper is cut. Then, the paper is
fed out by the roller in front of the ejector (The DC motor rotates the roller). Detecting the paper
bottom end, the roller stops its rotation.
When the fixed period of time passes, or the collection command is sent, the presenter collects
the paper.
Unit printer mechanism
Thermal printer
Sensor
Thermal head
Drive
Gear
Platen
Motor
Presenter
Cutter (guillotine-type full cutter)
Frame
Control and interface boards
Near-end sensor
