Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1996-05-31
1997-10-07
Hilten, John S.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
40012405, 40012418, B41J 230
Patent
active
056740140
ABSTRACT:
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.
REFERENCES:
patent: 3919935 (1975-11-01), Langnickel
patent: 4637742 (1987-01-01), Sakai
patent: 4850724 (1989-07-01), Fattori
patent: 5032031 (1991-07-01), Griiner et al.
patent: 5099383 (1992-03-01), Fukano et al.
Dillon Andrew J.
Hilten John S.
International Business Machines - Corporation
Tennent A. P.
LandOfFree
Printhead driver circuit for line printers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Printhead driver circuit for line printers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Printhead driver circuit for line printers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2351988