Self-clocking punched record reader

Details Self-clocking punched record reader Self-clocking punched record reader

1975-03-12

1976-08-24

Cook, Daryl W.

Registers

Calculators

Input-output calculator to indicator, printer, etc.

G06K 7016

Patent

active

039768562

ABSTRACT:
A self-clocking punched record reader for reading a record (10 ) without sprocket (clock) holes has two sets of sensors (RH1) and (RH2), sensing overlapping areas in the record columns, in a read head (12). A strobe allow flip-flop (SA1) determines when at least one sensor of each set is reading a hole, and a comparator (EQ1) determines when the two sets have identical outputs. The outputs from (SA1) and (EQ1) are combined to fire a one-shot (OS1) which gives a strobe pulse (STR) output, also gating the output from sensor set (RH2) as DATA. An error flip-flop (ER1) is arranged to detect double strobing (DST) and strobe failure (no strobe, (NST).

REFERENCES:
patent: 3248553 (1966-04-01), Patterson
patent: 3461305 (1969-08-01), Moulton
patent: 3480762 (1969-11-01), Del Vecchio
patent: 3586833 (1971-06-01), Schafer
patent: 3627990 (1971-12-01), Sallach
patent: 3751639 (1973-08-01), Searle et al.

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