Fault detection device for thermal printing head heating circuit

Details Fault detection device for thermal printing head heating circuit Fault detection device for thermal printing head heating circuit

1986-08-27

1988-09-06

Goldberg, E. A.

Recorders

Thermal recording

219216, 219482, 219506, G01D 1510, H05B 302

Patent

active

047696575

ABSTRACT:
A thermal printer with a fault detection circuit for detecting faults in heating elements used in the printer includes a print head containing the heating elements and a heating circuit associated with each element, a power supply, and a switching circuit interposed between the power supply and the print head. The fault detection circuit includes a current supply circuit, preferably a constant current source, which is connected in parallel to the switching circuit. A control circuit selects either a normal printing mode or a print head fault detection mode. In the fault detection mode, the switching circuit is disabled enabling the fault detection circuit to pass a test current through each of the heating elements for detecting any faults therein.

REFERENCES:
patent: 4369354 (1983-01-01), Goedecke et al.
patent: 4500893 (1985-02-01), Sakura et al.
patent: 4595935 (1986-06-01), Brooks et al.

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