Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent
1999-03-02
1999-09-14
Burr, Edgar
Typewriting machines
Typing by other than type-face or type-die
Thermal
347211, 347171, B41J 2315
Patent
active
059511753
ABSTRACT:
A thermal printer has a thermal head in which a FET is connected in series to an individual heater element of each of heater element groups which are connected in parallel with each other, and to which one capacitor for smoothing a power and eliminating a noise is connected in parallel relative to the heater element group. The thermal head performs printing on a thermal paper. The thermal printer includes a printing power source circuit, a failure detection power source circuit, a failure detection circuit for detecting a presence and absence of the failure of the heater element by comparing a voltage generated at opposite ends of the detecting resistor with a threshold value. FET control means is provided for causing discharging of the capacitor by simultaneously turning on all of the FET under the condition where the printing power source circuit and the failure detection power supply circuit are turned off, before the voltage is supplied from the failure detection power source circuit to the thermal head and the failure detection is performed.
REFERENCES:
patent: 4500893 (1985-02-01), Sakura et al.
patent: 4595935 (1986-06-01), Brooks et al.
patent: 4769657 (1988-09-01), Takahashi
patent: 4774526 (1988-09-01), Ito
patent: 4996487 (1991-02-01), McSparran et al.
patent: 5608442 (1997-03-01), Bennefeld et al.
Japan Patent No. 07-329334, Kokai, Dec. 19, 1995; Japan Utility Model Kokai No. 59-184644, Dec. 8, 1984; Japan Utility Model Kokai No. 01-138744, Sep. 21, 1989.
Burr Edgar
Chau Minh H.
NEC Corporation
Whitesel J. Warren
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