Editing Stored energy printer (section)

==Technology==
The most common printer to use this technology was the line-matrix printer made by [[Printronix]] and its licensees. In this type, the hammers are machined from an oval of magnetically permeable stainless steel, and the hammer-tips form vertical rows. The hammers are arranged as a "hammerbank"; a type of comb that oscillates horizontally to produce a line of dots. The original technology was patented by Printronix in 1974.<ref name="Romano">{{cite book |last1=Romano |first1=Frank |title=Color Desktop Printer Technology |date=22 February 2006 |publisher=CRC Press |isbn=978-0-8247-5364-1 |pages=85–107 |language=en |chapter=The Business and Market for Desktop Printers}}</ref>

The [[tungsten carbide]] hammer is [[Brazing|brazed]] to the center-top of a [[leaf spring]]. The top of this stiff spring is initially held back by a [[magnet]]ic pole-piece. To produce a dot, an [[electromagnetic coil]] wrapped around the pole-piece neutralizes the magnetic field, causing the spring to release the hammer and hit the ribbon and the paper behind it, leaving behind the printed dot.{{Citation needed|date=March 2025}}

Character matrix printers have also been produced.<ref name="Romano"/>