US3886445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for electromagnetic detection of welds in metal strips including pressing means for the strip
Assignee: JFE Engineering Corp
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Filing: 1973-10-17
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Granted: 1975-05-27
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Expires: 1993-10-17
Abstract
Abstract A method and apparatus for detecting the welds in a metal strip in which a long strip of metal produced by welding a number of metal strips together is passed, on its way to the next processing section, through a set of bridle rolls around which the metal strip is wound tightly and formed into good shape, and a plurality of sensors for detecting the welds in the metal strip are supported, together with at least one roller, on a holder. The roller is pressed against the strip tightly held on the bridle roll to accurately maintain a predetermined gap between the surface of the strip and the sensors and thereby to detect the passage of the welds in the strip with greater accuracy.
Inventors
- 👤 Iwane Chiba
- 👤 Toshihiro Mori
- 👤 Noboru Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:55
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9093
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
217 words
A method of detecting the welds in a metal strip comprising the steps of: tightly winding a moving metal strip comprised of shorter metal strips welded together around a set of bridle rolls for detecting the Welds in said metal strip, locating a detector of the non-contact electromagnetic induction type in the vicinity of said metal strip wound on a bridle roll, said detector including a holder member extending in the direction of the width of the strip and having a plurality of sensors fixedly mounted on said holder member in a row in the direction of the width of the strip, a plurality of protector elements projecting from said holder member adjacent said sensors, and at least one roller rotatably mounted to said holder member in the vicinity of said sensors and projecting from said holder member past the outermost surface of said sensors which face said strip, pressing said at least one roller against the surface of said strip on said bridle roll for maintaining a substantially constant predetermined gap between said plurality of sensors and the surface of said metal strip and maintaining said sensors in a fixed position for electromagnetic detection of said welds, and selectively separating said sensors away from said surface of said metal strip to cease said detection of welds.
Claim 2
Independent Claim
217 words
A method of detecting the welds in a metal strip comprising the steps of: tightly winding a moving metal strip comprised of shorter metal strips welded together around a set of bridle rolls for detecting the Welds in said metal strip, locating a detector of the non-contact electromagnetic induction type in the vicinity of said metal strip wound on a bridle roll, said detector including a holder member extending in the direction of the width of the strip and having a plurality of sensors fixedly mounted on said holder member in a row in the direction of the width of the strip, a plurality of protector elements projecting from said holder member adjacent said sensors, and at least one roller rotatably mounted to said holder member in the vicinity of said sensors and projecting from said holder member past the outermost surface of said sensors which face said strip, pressing said at least one roller against the surface of said strip on said bridle roll for maintaining a substantially constant predetermined gap between said plurality of sensors and the surface of said metal strip and maintaining said sensors in a fixed position for electromagnetic detection of said welds, and selectively separating said sensors away from said surface of said metal strip to cease said detection of welds.
Claim 3
Dependent Claim
82 words
A method according to claim 1, wherein said at least one roller includes plural rollers having an axis of rotation extending in the direction of the width of said metal strip and are rotatably mounted to said holder member adjacent to each end of said row of sensors, said rollers being pressed against the surface of said metal strip on said bridle roll so as to maintain said substantially constant predetermined gap between said surface of said metal strip and said sensors.
Claim 4
Dependent Claim
78 words
A method according to claim 1, wherein said at least one roller has an axis of rotation extending in the direction of the width of said metal strip and is rotatably carried by said holder member adjacent and parallel to said row of sensors, said roller being pressed against the surface of said metal strip on said bridle roll so as to maintain said substantially constant predetermined gap between said surface of said metal strip and said sensors.
Claim 5
Dependent Claim
66 words
A method according to claim 1, wherein said holder member is mounted on one end of a holder arm, one end of said holder arm being hinged by a pin at an intermediate portion thereof, comprising selectively pushing and pulling the other end of said holder arm mechanism to selectively engage and disengage said detector with said surface of said metal strip at the detecting position.
Claim 6
Dependent Claim
65 words
A method according to claim 1, comprising pressing at least one additional roller having an axis of rotation extending parallel to that of said bridle roll against the surface of said metal strip in the vicinity of said row of sensors by means of a cylinder-piston mechanism having a plurality of guide rods so as to tightly wind said metal strip on said bridle roll.
Claim 7
Dependent Claim
25 words
A method according to claim 1, comprising winding said metal strip around the bridle rolls at more than half the circumference of said bridle rolls.
Claim 8
Dependent Claim
211 words
Apparatus for detecting the welds in a long strip of metal produced by welding a plurality of shorter metal strips together, said apparatus comprising: a set of bridle rolls around which said strip is wound; a non-contact type detector including a holder member having a plurality of electromagnetic induction type sensors fixedly mounted thereon, said sensors being spaced from said strip and arranged in a row in the direction of the width of the strip, at least one roller rotatably mounted adjacent said sensors with its axis of rotation extending in the direction of the width of the strip, said at least one roller being mounted in the vicinity of said sensors and projecting from said holder member past the outermost surface of said sensors which face the strip, and a plurality of protector elements projecting from said holder member adjacent said sensors; a holder arm hinged at an intermediate portion thereof and carrying said detector at one end thereof; and a double acting mechanism attached to the other end of said holder arm for selectIvely locating said detector adjacent said strip and for pressing said at least one roller against said metal strip and maintaining a substantially constant predetermined gap between the surface of said metal strip and said sensors.
Claim 9
Dependent Claim
211 words
Apparatus for detecting the welds in a long strip of metal produced by welding a plurality of shorter metal strips together, said apparatus comprising: a set of bridle rolls around which said strip is wound; a non-contact type detector including a holder member having a plurality of electromagnetic induction type sensors fixedly mounted thereon, said sensors being spaced from said strip and arranged in a row in the direction of the width of the strip, at least one roller rotatably mounted adjacent said sensors with its axis of rotation extending in the direction of the width of the strip, said at least one roller being mounted in the vicinity of said sensors and projecting from said holder member past the outermost surface of said sensors which face the strip, and a plurality of protector elements projecting from said holder member adjacent said sensors; a holder arm hinged at an intermediate portion thereof and carrying said detector at one end thereof; and a double acting mechanism attached to the other end of said holder arm for selectIvely locating said detector adjacent said strip and for pressing said at least one roller against said metal strip and maintaining a substantially constant predetermined gap between the surface of said metal strip and said sensors.
Claim 10
Dependent Claim
72 words
Apparatus according to claim 7, wherein said at least one roller includes a pair of rollers and wherein said rollers are respectively rotatably carried by said holder member at a position adjacent to each end of said row of sensors, said rollers being selectively pressed against the surface of said metal strip by said double acting mechanism to maintain said predetermined gap between said sensors and said surface of said metal strip.
Claim 11
Dependent Claim
79 words
Apparatus according to claim 7, wherein said at least one roller includes an elongated roller extending in the direction of the width of the strip and wherein said elongated roller is rotatably carried by said holder arm in parallel with and adjacent to said row of sensors, said roller being selectively pressed against the surface of said metal strip by said double acting mechanism to maintain said predetermined gap between said sensors and said surface of said metal strip.
Claim 12
Dependent Claim
14 words
Apparatus according to claim 7, wherein said double acting mechanism includes a cylinder-piston mechanism.
Claim 13
Dependent Claim
37 words
Apparatus according to claim 7, wherein said holder arm is hinged at a central portion thereof by a pin, and said other end of said holder arm is connected to the piston rod of said cylinder-piston mechanism.
Claim 14
Dependent Claim
72 words
Apparatus according to claim 7, further including pusher means comprising a cylinder-piston mechanism, at least one pusher roller having an axis of rotation parallel to that of said bridle roll and being operatively coupled to said cylinder-piston mechanism, and a plurality of guide rods coupled to said pusher roller, said cylinder-piston mechanism selectively pressing said pusher roller against said metal strip to more tightly wind said metal strip on said bridle roll.
Claim 15
Dependent Claim
24 words
Apparatus according to claim 7, wherein said sensors are detachably mounted to said holder member while said sensors are in the detecting positions thereof.
Claim 16
Dependent Claim
22 words
Apparatus according to claim 7, wherein said metal strip is wound around more than one half the circumference of said bridle rolls.
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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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |