US3743839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for a tape reader
Assignee: Digital Equipment Corp
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Filing: 1971-12-03
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Granted: 1973-07-03
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Expires: 1991-12-03
Abstract
Abstract A tape reader. Periodic pulses energize a driving motor to advance a punched tape past a reading device; they also enable a reading operation. Each motor pulse sets a flip-flop circuit. When a detector senses registration of a sprocket hole in the tape with the reader, it generates an output which, if in time coincidence with the flip-flop output, produces a strobing pulse that causes the reading device to sense data on the tape. The strobing pulse immediately resets the flip-flop circuit to inhibit further strobing pulses until the next motor pulse occurs.
Inventors
- 👤 M Leis
- 👤 R Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:15
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/01; G06K7/016; G06K13/00; G06K13/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
In a tape reader including means for advancing a tape past a detection station, the improvement of a control for timing the reading of data at data positions in the tape, said control comprising: A. means for generating motor pulses to advance the tape incrementally, B. gating means enabled by each motor pulse, and C. means sensing the arrival of data positions at the detection station for generating a strobing signal, said gating means passing the strobing signal in its enabled condition as A reading signal, the reading signal resetting said gating means to thereby disable said gating means until the arrival of the next motor pulse.
Claim 2
Dependent Claim
107 words
In a tape reader including means for advancing a tape past a detection station, the improvement of a control for timing the reading of data at data positions in the tape, said control comprising: A. means for generating motor pulses to advance the tape incrementally, B. gating means enabled by each motor pulse, and C. means sensing the arrival of data positions at the detection station for generating a strobing signal, said gating means passing the strobing signal in its enabled condition as A reading signal, the reading signal resetting said gating means to thereby disable said gating means until the arrival of the next motor pulse.
Claim 3
Dependent Claim
35 words
A tape reader as recited in claim 1 wherein said tape includes a series of sprocket holes, said sensing means including means responsive to the passage of a sprocket hole for generating the strobing signal.
Claim 4
Dependent Claim
121 words
In a reader for prepunched tapes with sprocket holes including an optical reader with gated data storage means, means for generating strobing signals in response to the arrival of successive sprocket holes at the reader and means for driving the tape past the reader, a control comprising: A. means for generating pulses in succession for energizing the driving means, B. a bi-stable device set to a first tape by each motor drive pulse, and C. a gate for receiving strobing signals, said gate being enabled by said bistable device in the first for passing the strobing pulse to the data storage means to thereby store data and for resetting said bi-stable device to a second state to thereby disable said gate.
Claim 5
Dependent Claim
121 words
In a reader for prepunched tapes with sprocket holes including an optical reader with gated data storage means, means for generating strobing signals in response to the arrival of successive sprocket holes at the reader and means for driving the tape past the reader, a control comprising: A. means for generating pulses in succession for energizing the driving means, B. a bi-stable device set to a first tape by each motor drive pulse, and C. a gate for receiving strobing signals, said gate being enabled by said bistable device in the first for passing the strobing pulse to the data storage means to thereby store data and for resetting said bi-stable device to a second state to thereby disable said gate.
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |