Printhead driver circuit for line printers

A printhead drive circuit to be utilized in impact printers is disclosed. In accordance with a preferred embodiment of the present invention, the printhead driver circuit includes a first switch, a set of second switches, and a decoupling circuit. The first switch is coupled between a first terminal...

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Bibliographische Detailangaben
Hauptverfasser:	JORDAN, JAMES DOUGLAS
Format:	Patent
Sprache:	eng
Schlagworte:	CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES PERFORMING OPERATIONS PRINTING SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A printhead drive circuit to be utilized in impact printers is disclosed. In accordance with a preferred embodiment of the present invention, the printhead driver circuit includes a first switch, a set of second switches, and a decoupling circuit. The first switch is coupled between a first terminal of a DC power supply and a first terminal of a set of solenoid coils. The set of second switches is utilized to selectively energize each of the solenoid coils within the set. Each of the second switches is also respectively coupled between a second terminal of each of the solenoid coils and a second terminal of the DC power supply. The decoupling circuit is for selectively decoupling a first group of solenoid coils within the set that are not energized from a second group of solenoid coils within the set that are energized. The decoupling circuit is connected between the first terminal of the DC power supply and the second terminal of each solenoid coil via a diode at each of the second terminals of each solenoid coil.