US3731205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequence detector circuit
Assignee: EMBHART CORP
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Filing: 1972-03-23
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Granted: 1973-05-01
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Expires: 1992-03-23
Abstract
Abstract First and second longitudinally spaced photocell transducers are provided alongside a conveyor upon which articles are fed in sequence past these photocells, the spacing of the photocells being such that each is adapted to be located just inside the leading and trailing edges respectively of an article on the conveyor, each photocell is adapted to be activated in response to passage of the articles on the conveyor. Electric circuit means of the solid state type is adapted to accept sequential output signals from the photocells and to generate an output (OUT) pulse when the sequential photocell outputs bear a predetermined phase relationship to one another.
Inventors
- 👤 E Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:42
CPC Classifications
B; B07; B07C; B07C5/00; B07C5/04; B07C5/12; B07C5/122; B07C5/126; G; G01; G01B; G01B11/00; G01B11/24; G01B11/245; G01V; G01V8/00; G01V8/10; G01V8/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
First and second electromechanical transducers capable of producing first and second output signals which are similar to one another in response to similar mechanical conditions, said transducers being spaced longitudinally with respect to one another for sequential activation in response to a single mechanical condition to which each transducer is sequentially subjected, electric circuit means for accepting sequential output signals and for generating an output pulse when said sequential output signals bear a predetermined time phase relationship to one another, said electric circuit means comprising signal inverting means for said first output signal, first differentiating means for producing a pulse (TEA) coincident with the trailing edge of said first output signal as inverted, a first NAND gate for producing a binary pulse (X) when said pulse (TEA) and said second output pulse both occur, second differentiating means for producing a pulse (LEB) coincident with the leading edge of said second output signal, a second NAND gate for producing a binary pulse (Y) when said pulse (LEB) and said first output pulse both occur, and gate means for generating an OUT signal only when said binary pulse (Y) occurs before said binary pulse (X).
Claim 2
Dependent Claim
193 words
First and second electromechanical transducers capable of producing first and second output signals which are similar to one another in response to similar mechanical conditions, said transducers being spaced longitudinally with respect to one another for sequential activation in response to a single mechanical condition to which each transducer is sequentially subjected, electric circuit means for accepting sequential output signals and for generating an output pulse when said sequential output signals bear a predetermined time phase relationship to one another, said electric circuit means comprising signal inverting means for said first output signal, first differentiating means for producing a pulse (TEA) coincident with the trailing edge of said first output signal as inverted, a first NAND gate for producing a binary pulse (X) when said pulse (TEA) and said second output pulse both occur, second differentiating means for producing a pulse (LEB) coincident with the leading edge of said second output signal, a second NAND gate for producing a binary pulse (Y) when said pulse (LEB) and said first output pulse both occur, and gate means for generating an OUT signal only when said binary pulse (Y) occurs before said binary pulse (X).
Claim 3
Dependent Claim
52 words
The combination recited in claim 1 wherein said gate means for generating said OUT signal comprises third and fourth NAND gates each of which receives as inputs each of said binary pulses X and Y respectively, and each of which NAND gates also receive as additional inputs the outputs of one another.
Claim 4
Dependent Claim
128 words
First and second electromechanical transducers capable of producing first and second output signals which are similar to one another in response to the longitudinal movement of an object past these transducers in sequence, said transducers being longitudinally spaced less than the minimum girth of the objects to be detected, logic circuit means for accepting the sequential output signals and producing pulses coincident with the leading edge of said second output signal and the trailing edge of said first output signal, said logic circuit further including flip flop means which is set by said leading edge pulse and reset by said trailing edge pulse whereby an output pulse (OUT) is generated each time that an object passes said transducers regardless of the spacing between successive objects passing said transducers.
Claim 5
Dependent Claim
128 words
First and second electromechanical transducers capable of producing first and second output signals which are similar to one another in response to the longitudinal movement of an object past these transducers in sequence, said transducers being longitudinally spaced less than the minimum girth of the objects to be detected, logic circuit means for accepting the sequential output signals and producing pulses coincident with the leading edge of said second output signal and the trailing edge of said first output signal, said logic circuit further including flip flop means which is set by said leading edge pulse and reset by said trailing edge pulse whereby an output pulse (OUT) is generated each time that an object passes said transducers regardless of the spacing between successive objects passing said transducers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |