Registers – Coded record sensors – Particular sensor structure
Patent
1979-08-17
1981-06-30
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
235489, 235494, 235436, G06K 710, G06K 2100, G06K 1906
Patent
active
042764696
ABSTRACT:
A card reader capable of accurately reading a data card inserted in any of four possible orientations includes a card with two data tracks, a card reader producing two corresponding data pulse trains, and two differentiation networks for producing two differentiated data pulse trains. The differentiated data pulse trains are combined to form a clock pulse train and, further, are latched to produce two latched data trains. A first selector circuit assigns a first binary code value to the latched data train exhibiting the first appearing pulse and a second selector circuit sets a storage direction flag dependent upon the position of a subsequent data pulse. The latched data train assigned a first binary code value, the clock pulse train, and the storage direction flag are received by a serial to parallel converter which stores least significant digit first or most significant digit first dependent upon the flag.
REFERENCES:
patent: 3408483 (1968-10-01), Zuse
patent: 3496341 (1970-02-01), Mizuta et al.
patent: 3598964 (1971-08-01), Dell et al.
patent: 3602697 (1971-08-01), Tanaka et al.
patent: 3673389 (1972-06-01), Kapsambelis et al.
Cook Daryl W.
Schlyer Lyle J.
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