dot matrix printer

A printer that uses hammers and a ribbon to form images out of dots. It is widely used to print multipart forms and address labels. Also known as a "serial dot matrix printer," the tractor and sprocket mechanism in these devices handles thicker media better than laser and inkjet printers.

Hammers Hit the Ribbon
The dot matrix printer uses one or two columns of dot hammers that are moved across the paper. The hammers hit the ribbon into the paper, which causes the ink to be deposited. The more hammers, the higher the resolution. For example, 9-pin heads produce draft quality text, while 24-pin heads produce typewriter quality output. Speeds range from 200 to 400 cps, which is about 90 to 180 lpm. See line matrix printer.

Dot Matrix Mechanism

Dot matrix printers print columns of dots in a serial fashion. The more dot hammers (pins), the better looking the printed results.

Dot Matrix Printer

Dot matrix printers fitted with a tractor feed are commonly used for printing continuous multipart forms and mailing labels. The tractor feed contains a sprocket that grabs the perforated holes at both sides of the form and pulls it through uniformly.

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(hardware, printer)

dot matrix printer - A kind of printer with a vertical column of up to 48 small closely packed needles or "pins" each of which can be individually forced forward to press an ink ribbon against the paper. The print head is repeatedly scanned across the page and different combinations of needles activated at each point. Dot matrix printers are noisy compared to non-impact printers.