Data card reader employing synchronization and resynchronization

Details Data card reader employing synchronization and resynchronization Data card reader employing synchronization and resynchronization

1975-08-29

1978-09-12

Kilgore, Robert M.

Registers

Coded record sensors

Synchronization

235466, 179 15BS, G06K 7016, H04L 1534, G06K 704

Patent

active

041140311

ABSTRACT:
A card reader for reading data cards of the type having columns of machine-readable information thereon and transmitting data outputs representative of this information to an interface, includes a read station for sensing the information in each column and generating corresponding data outputs. A latching circuit receives data outputs from the sensing means and transmits the data outputs to the interface responsive to a strobing signal. A timing wheel is employed to detect the velocity of the cards during transport through the read station to provide an output proportional to velocity. A train of pulses is generated for each column responsive to the velocity output, and the period of the pulse train is adjusted to compensate for increases or decreases in the velocity of the card through the read station, by employing a phase-locked loop circuit. The pulse train is then decoded to generate the strobing signal to the latching means coincident with a first predetermined pulse in the train, and for utilizing other pulses in the train to generate signals initiating other functions of the reader.

REFERENCES:
patent: 3184581 (1965-05-01), Willoughby
patent: 3229073 (1966-01-01), Macker
patent: 3419710 (1968-12-01), Matthews
patent: 3420989 (1969-01-01), Sapp
patent: 3474230 (1969-10-01), McMillen
patent: 3523231 (1970-08-01), Arthur
patent: 3663800 (1972-05-01), Myer
patent: 3751639 (1973-08-01), Serale
patent: 3828168 (1974-08-01), O'Callaghan

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