Star Micronics MP111MP-24G-A - Manual (Page 5)

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2. CONSTRUCTION
2.1 Configuration
This printer mechanism is composed of the following components.
Printer mechanism Drive unit, gears, and carriage unit
Detectors Timing detector
Home position detector
Paper out detector
Paper feed mechanism
Ink ribbon wind mechanism
Print head unit
Frame unit
Other
You can also use 1.75 inch (45 mm) width roll paper by removing the paper guide B and attaching the optional
guide.
2.2 Principle of Operation
2.2.1 Drive
This printer mechanism moves the print head, feeds paper and feed ribbon with the motor.
2.2.2 Print head movement
The rotation of the motor is transmitted to drive shaft through the reduction gears. The carriage makes lateral
reciprocal movements along a groove that is carved on this drive shaft, consequently moving the print head.
2.2.3 Print timing
Printing is done when the timing signal is generated synchronized with the rotation of the motor, based on the
home position signal.
2.2.4 Ribbon feed
The ink ribbon is housed inside a ribbon cartridge in endless fashion. A ribbon feed roller is turned by the
rotation of the motor whereby the ink ribbon is wound up.
2.2.5 Paper feed
Paper feeding is done by the rotation of the stepping motor.