US3786265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting defects in continuous traveling material
Assignee: LINDLY CO Inc
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Filing: 1973-02-02
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Granted: 1974-01-15
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Expires: 1993-02-02
Abstract
Abstract Apparatus for detecting defects in continuous traveling material comprises two photoelectric detecting units disposed on the path of travel of the material with one unit downstream of the other, and a coordinating circuit between the two units. A signal produced by the upstream unit upon detection of an apparent defect is delayed or stored by a shift register for a period of time required for a defect in the material to travel from one detecting unit to the other. Coincidence of an output signal of the shift register with an output signal of the downstream detecting unit indicates the presence of an actual defect in the material. A defect signal thereupon produced can be used as desired. For example it can be used to stop the material and can be fed to a counter to provide a record of defects occurring in the material.
Inventors
- 👤 S Abilock
- 👤 R Shottenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:10
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/898; G01N21/8983
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
218 words
Apparatus for detecting defects in continuous traveling material comprising first detecting means located on the path of travel of said material for detecting an apparent defect in said material as it passes said first detecting means, second detecting means located on the path of travel of said material a selected distance downstream of said first detecting means for detecting a defect as it passes said second detecting means, each of said detecting means including means for producing an output signal upon detecting an apparent defect in said material, delay means receiving an output signal from said first detecting meanS and later producing an output signal, means receiving said output signals from said delay means and from said second detecting means and producing a defect signal when said output signals of the delay means and the second detecting means are coincident, said delay means comprising a series of signal storage units, means for receiving in a first storage unit of said series an input signal from said first detecting means, means for sequentially shifting a signal to succeeding units and means for providing an output from at least one of said succeeding units, the resulting delay corresponding to the time required for travel of a defect in said material from said first detecting means to said second detecting means.
Claim 2
Dependent Claim
218 words
Apparatus for detecting defects in continuous traveling material comprising first detecting means located on the path of travel of said material for detecting an apparent defect in said material as it passes said first detecting means, second detecting means located on the path of travel of said material a selected distance downstream of said first detecting means for detecting a defect as it passes said second detecting means, each of said detecting means including means for producing an output signal upon detecting an apparent defect in said material, delay means receiving an output signal from said first detecting meanS and later producing an output signal, means receiving said output signals from said delay means and from said second detecting means and producing a defect signal when said output signals of the delay means and the second detecting means are coincident, said delay means comprising a series of signal storage units, means for receiving in a first storage unit of said series an input signal from said first detecting means, means for sequentially shifting a signal to succeeding units and means for providing an output from at least one of said succeeding units, the resulting delay corresponding to the time required for travel of a defect in said material from said first detecting means to said second detecting means.
Claim 3
Dependent Claim
30 words
Apparatus according to claim 1, in which said delay means comprises means for producing an output signal of longer duration than the input signal received from said first detecting means.
Claim 4
Dependent Claim
69 words
Apparatus according to claim 1, in which said delay means comprises a shift register having a plurality of stages, means for feeding an input signal from said first detecting means to a first stage of said shift register, means for applying shift signals to said shift register to shift said input signal sequentially to successive stages and means to deliver an output signal from at least one later stage.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 3, in which each stage of said shift register comprises a bistable flip-flop circuit.
Claim 6
Dependent Claim
32 words
Apparatus according to claim 1, in which said means for applying shift signals comprises a pulse generator and means for driving said pulse generator in synchronism with the travel of said material.
Claim 7
Dependent Claim
45 words
Apparatus according to claim 3, in which said means for feeding an input signal to said shift register comprises means receiving an output signal from said first detecting means and storing said signal until the next following shift signal is received by said shift register.
Claim 8
Dependent Claim
21 words
Apparatus according to claim 6, comprising means for resetting said storing means a predetermined time after said next following shift signal.
Claim 9
Dependent Claim
66 words
Apparatus according to claim 3, in which said delay means includes a NOR gate receiving input signals from at least two successive stages of said shift register and producing an output signal when a signal is received from either of said successive stages, whereby said output signal of said NOR gate is longer than the input signal fed to the first stage of said shift register.
Claim 10
Dependent Claim
38 words
Apparatus according to claim 3, in which said shift register comprises integrated circuitry comprising a plurality of stages and at least one additional stage comprising a bistable flip-flop circuit connected with said integrated circuitry to operate sequentially therewith.
Claim 11
Dependent Claim
47 words
Apparatus according to claim 9, in which said means for applying clock signals comprises means providing a time differential between the shifting of said stages of said integrated circuitry and said additional stage to assure transfer of a signal between said integrated circuitry and said additional stage.
Claim 12
Dependent Claim
31 words
Apparatus according to claim 1, comprising means receiving an output signal from said delay means and producing an indicating signal of greater duration than said output signal from the delay means.
Claim 13
Dependent Claim
21 words
Apparatus according to claim 1, in which said means for producing a defect signal is associated with said second detecting means.
Claim 14
Dependent Claim
29 words
Apparatus according to claim 1, in which said means for producing a defect signal comprises an AND gate receiving signals from said delay means and said second detecting means.
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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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |