Print head activating circuit for a wire dot printer

Details Print head activating circuit for a wire dot printer Print head activating circuit for a wire dot printer

1990-01-26

1992-03-24

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

323272, 101 9329, 4001572, B41J 924, H01H 4732

Patent

active

050993836

ABSTRACT:
A print head activation circuit for a wire dot printer includes a first switch and a second switch. A CPU produces a printing timing control signal. A first driving signal-generating circuit produces a first driving signal pulse having a pulse width T.sub.1 in response to the printing timing control signal. A delay circuit delays the first driving signal. A second driving signal-generating means produces a second driving signal pulse having a pulse width T.sub.2 in response to the leading edge of the delayed first driving signal. The first switching means is connected with a DC power supply. The first switching means is also connected with one terminal of each actuator coil of the print head. The second switching means is connected between a second terminal of the actuator coil and ground. The second driving signal-generating means is operated in response to the delayed first driving signal. The delay time .DELTA. T is set so that the first switching means is biased into conduction simultaneously with or earlier than the second switching means.

REFERENCES:
patent: 4329921 (1982-05-01), Treiber et al.
patent: 4429342 (1984-01-01), Heider
patent: 4637742 (1987-01-01), Sakai
patent: 4667117 (1987-05-01), Nebgen et al.
patent: 4797017 (1987-01-01), Okouchi
patent: 4940343 (1990-07-01), Kikuchi et al.

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