Dot matrix line printer

Details Dot matrix line printer Dot matrix line printer

1983-04-04

1985-04-30

Sewell, Paul T.

Printing

Selective or progressive

Bed and platen machines

101 9308, 400121, B41J 312

Patent

active

045136610

ABSTRACT:
A dot matrix line printer/plotter apparatus for producing hard copy printout of digitally represented data. The apparatus utilizes one or more hammer banks, each mounted so as to shuttle across a paper web fed therepast. Each hammer bank carries a plurality of hammer assemblies, each of which can be individually actuated to print a dot as it sweeps across the paper. Each hammer bank is mounted on a circuit board which carries electronic circuitry to actuate the hammer assemblies thereon. The circuit boards are supported by leaf springs and driven by a stepper motor which shuttles the boards along linear paths to sweep each hammer assembly across a certain portion of the paper width. Each hammer assembly includes a hammer supported in a guide tube for linear movement between a retracted position and an extended position engaging the paper. A permanent magnet is provided to normally latch the hammer in its retracted position. Each hammer assembly further includes a coil energizable to null the action of the permanent magnet as to that hammer assembly and to thus permit a spring to propel the hammer to said extended position.

REFERENCES:
patent: 3874492 (1975-04-01), Hurst
patent: 4127334 (1978-11-01), Watanabe et al.
patent: 4248147 (1981-02-01), Zenner
patent: 4300845 (1981-11-01), Martin et al.
patent: 4314282 (1982-02-01), Fischbeck et al.
IBM Tech. Disc. Bulletin, by E. G. Wiese, vol. 17, No. 12, May 1975, p. 3550.
IBM Tech. Disc. Bulletin, by J. E. Lisinski et al., vol. 20, No. 11B, Apr. 1978, pp. 4683-4685.

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