Printer Head Positioning
The printer head is attached to a metal bar that ensures correct alignment, but horizontal positioning is controlled by a rubber band that attaches to sprockets on two wheels at each side which is then driven with an electric motor. Actual position can be found out either be dead count using a stepper motor, rotary encoder attached to one wheel or a transparent plastic band with markings that is read by an optical sensor on the printer head (common on inkjets).
Read more about this topic: Dot Matrix Printing
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