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US3976856A
Expired / Lapsed
US
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Self-clocking punched record reader
Assignee: Honeywell Information Systems Ltd
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Filing: 1975-03-12
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Granted: 1976-08-24
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Expires: 1995-03-12
Abstract
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).
Inventors
- 👤 William Ramage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:44
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/01; G06K7/016
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A self-clocking punched record reader comprising: two rows of sensors, corresponding sensors in the two rows being arranged to sense areas of the record which are longitudinally displaced but overlapping; a comparator, fed from the two rows of sensors, for determining when the outputs of the two rows of sensors are identical; and strobe signal generating circuitry for generating a strobe signal on detection of such identity.
Claim 2
Dependent Claim
67 words
A self-clocking punched record reader comprising: two rows of sensors, corresponding sensors in the two rows being arranged to sense areas of the record which are longitudinally displaced but overlapping; a comparator, fed from the two rows of sensors, for determining when the outputs of the two rows of sensors are identical; and strobe signal generating circuitry for generating a strobe signal on detection of such identity.
Claim 3
Dependent Claim
54 words
A record reader according to claim 1 including strobe allow flip-flop fed from the two rows of sensors for determining when at least one sensor in each row is sensing a hole; and gating means controlled by the strobe allow flip-flop for gating the output of the comparator to the strobe signal generating circuitry.
Claim 4
Dependent Claim
41 words
A record reader according to claim 2 including an error flip-flop cleared by the strobe allow flip-flop when at least one sensor in each row is sensing a hole, said error flip-flop being set by the generation of a strobe signal.
Claim 5
Dependent Claim
28 words
A record reader according to claim 3 including a gate for gating strobe signals when the error flip-flop is set, an output from this gate indicating double strobing.
Claim 6
Dependent Claim
47 words
A record reader according to claim 3 including means for generating a signal when on sensor of the leading row is sensing a hole, and a gate for gating this signal when the error flip-flop is cleared, an output from this gate indicating a failure to strobe.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |