These are often used for printing box labels. They print as rapidly as slow lineprinters, and can print bar codes and other graphics as well. When implemented as impact printers, they can be the least expensive to operate, per page.
There are numerous mechanisms. One of the most successful is to use a reliable stored energy printer arranged as a comb, and then move the comb back and forth.
Lineprinters are still widely used in datacenters and in industrial environments and can print multipart forms at a very rapid rate.
The lineprinter is a form of high speed impact printer in which a line of type is printed at a time.
In a typical drum printer design, a fixed font character set is engraved onto the periphery of a number of print wheels, the number matching the number of columns (letters in a line) the printer could print.
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