Operability verification for segmental electromagnetic display

Details Operability verification for segmental electromagnetic display Operability verification for segmental electromagnetic display

1979-09-21

1981-05-19

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340643, 340713, G09F 932

Patent

active

042688272

ABSTRACT:
In fuel dispensing apparatus utilizing seven-segment electromagnetic displays each segment of all the displays is operatively driven and tested seriatum both prior to and during the dispensing cycle by measuring the current flowing therethrough. Where peak current through each segment coil exceeds a predetermined switching value within an allotted time period, an inactivating signal is emitted via a microprocessor to inactivate the drive for the respective segment. Failure to receive one or more of the inactivating drive signals per display represents a display malfunction which via the microprocessor renders the dispensing apparatus inoperable.

REFERENCES:
patent: 3548403 (1970-12-01), Johnson
patent: 3696390 (1972-10-01), Cohen
patent: 3725898 (1973-04-01), Canton
patent: 3829653 (1974-08-01), Ensminger et al.
patent: 3866171 (1975-02-01), Loshbough
patent: 3877008 (1975-04-01), Payne

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