US3774041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic inspector of the surface of running object
Assignee: Nippon Steel Nisshin Co Ltd
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Filing: 1972-08-24
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Granted: 1973-11-20
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Expires: 1992-08-24
Abstract
Abstract An apparatus for detecting defects in the surface of a running sheet material by continually scanning it in the transverse direction; wherein the running speed of the sheet object is detected, the amount of electricity proportional to the running speed is integrated by an integrator over the period of time for which the surface of the running sheet object is scanned by the light beam, the output of the integrator is converted into a plurality of pulses with different rise points by a comparator circuit including a plurality of comparator units for comparing the output of the integrator with a predetermined level, these pulses and a signal obtained as a result of the running object being scanned by a light beam are digitally processed by a digital processor thereby to convert them into a group of divided pulses of which the rise point of one occurs at the same time as the fall point of an adjacent pulse, and defect detection signals obtained by light-beam scanning of the object are recorded in sequence by a plurality of recorders corresponding to said divided pulses.
Inventors
- 👤 A Kaneko
- 👤 Y Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:48
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
In an apparatus for detecting a defect on the surface of a running sheet object by applying a beam of light onto the surface of said object for the scanning thereof in the transverse direction, the improvement comprising means for detecting the running speed of said object, means for integrating the amount of electricity proportional to said running speed over a period of time needed for said beam of light to scan said surface of said object, a comparator including a plurality of comparator units for comparing the output of said integrating means with predetermined different reference levels and converting said output of said integrating means into a plurality of pulses with different rise points, digital processing means for converting said pulses and a signal obtained from the scanning of said surface of said object into a plurality of pulses having staggered rise and fall points, the rise point of one pulse occurring at the same time as the fall point of an object pulse and a plurality of recording means which are energized respectively in response to said converted pulses, said recording means recording in sequence defect-carrying signals obtained by the scanning.
Claim 2
Dependent Claim
193 words
In an apparatus for detecting a defect on the surface of a running sheet object by applying a beam of light onto the surface of said object for the scanning thereof in the transverse direction, the improvement comprising means for detecting the running speed of said object, means for integrating the amount of electricity proportional to said running speed over a period of time needed for said beam of light to scan said surface of said object, a comparator including a plurality of comparator units for comparing the output of said integrating means with predetermined different reference levels and converting said output of said integrating means into a plurality of pulses with different rise points, digital processing means for converting said pulses and a signal obtained from the scanning of said surface of said object into a plurality of pulses having staggered rise and fall points, the rise point of one pulse occurring at the same time as the fall point of an object pulse and a plurality of recording means which are energized respectively in response to said converted pulses, said recording means recording in sequence defect-carrying signals obtained by the scanning.
Claim 3
Dependent Claim
201 words
In an apparatus for detecting a defect on the surface of a running sheet object by applying a beam of light onto the surface of said object for the scanning thereof, the improvement comprising means for detecting a voltage proportional to the running speed of said object, a couple of integrators which begins to integrate said voltage the instant that said beam of light begins to scan the surface of said object, a comparator which produces a reset signal when the output of one of said integrators reaches the level of the reference voltage of said comparator which is variable according to the width of said object, said integrator being reset by said reset signal, a gate circuit for producing a plurality of divided pulses in response to the output of the other of said integrators which has a time constant variable with said reference voltage, each of said divided pulses having a rise point occurring at the same time as the fall point of an adjacent divided pulse, a plurality of recording means corresponding to and energized respectively by said divided pulses, said recording means recording in sequence defect-carrying signals obtained by the scanning of said surface of said object.
Claim 4
Dependent Claim
201 words
In an apparatus for detecting a defect on the surface of a running sheet object by applying a beam of light onto the surface of said object for the scanning thereof, the improvement comprising means for detecting a voltage proportional to the running speed of said object, a couple of integrators which begins to integrate said voltage the instant that said beam of light begins to scan the surface of said object, a comparator which produces a reset signal when the output of one of said integrators reaches the level of the reference voltage of said comparator which is variable according to the width of said object, said integrator being reset by said reset signal, a gate circuit for producing a plurality of divided pulses in response to the output of the other of said integrators which has a time constant variable with said reference voltage, each of said divided pulses having a rise point occurring at the same time as the fall point of an adjacent divided pulse, a plurality of recording means corresponding to and energized respectively by said divided pulses, said recording means recording in sequence defect-carrying signals obtained by the scanning of said surface of said object.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |