US3585495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting during operation the degree of elongation of rolled magnetic metal strips
Assignee: Toshiba Corp
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Filing: 1969-07-09
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Granted: 1971-06-15
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Expires: 1989-07-09
Abstract
Abstract A method and apparatus for detecting during operation the degree of elongation of rolled magnetic metal strips which consists in arranging at a prescribed interval at the outlet side of a work roll assembly in the travelling direction of the metal strip at least two induction detectors for detecting electrical signals representing changes in inductance corresponding to the displacements of said strip in the direction of its thickness, determining the value of a difference between the signals from the two induction detectors by means of detectors corresponding to the amount of displacement of the metal strip in the direction of its thickness as determined with respect to said prescribed interval and squaring the differential value by means of squarelaw circuits to define the degree of elongation of the metal strip.
Inventors
- 👤 Moritada Kubo
- 👤 Kuniji Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:14
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/28; G01B7/287; B; B21; B21B; B21B38/00; B21B38/02; G01B7/34; G01B7/345
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
119 words
A method for determining during operation the degree of elongation of a rolled magnetic metal strip which comprises the processes of detecting at the outlet side of a work roll assembly signals representing changes in inductance corresponding to the displacements of said metal strip in the direction of its thickness at at least two points disposed at a prescribed interval in the travelling direction of the metal strip, determining the value of a difference between said two detected signals representing the amount of displacement of the metal strip in the direction of its thickness with respect to the aforesaid prescribed interval and squaring the differential value to obtain a signal denoting the degree of elongation of the metal strip.
Claim 2
Independent Claim
119 words
A method for determining during operation the degree of elongation of a rolled magnetic metal strip which comprises the processes of detecting at the outlet side of a work roll assembly signals representing changes in inductance corresponding to the displacements of said metal strip in the direction of its thickness at at least two points disposed at a prescribed interval in the travelling direction of the metal strip, determining the value of a difference between said two detected signals representing the amount of displacement of the metal strip in the direction of its thickness with respect to the aforesaid prescribed interval and squaring the differential value to obtain a signal denoting the degree of elongation of the metal strip.
Claim 3
Independent Claim
166 words
A method for determining during operation the degree of elongation of a rolled magnetic metal strip which comprises the processes of detecting at the outlet side of a work roll assembly the value of a difference between the electrical signals representing changes in inductance corresponding to the displacements of said metal strip in the direction of its thickness as determined with respect to a longitudinal unit interval on the surface of the metal strip which is considerably shorter than the average wavelength of undulations occurring on said surface in the longitudinal direction thereof, said determination being repeated at a plurality of prescribed points distributed over a distance in the longitudinal direction which is much larger than the average wavelength of the aforesaid undulations, namely, is equal to an integral multiple of the aforementioned unit interval, squaring each of a plurality of differential values thus obtained and summing up said squared differential values thereby to obtain a signal representing the degree of elongation of the metal strip.
Claim 4
Independent Claim
166 words
A method for determining during operation the degree of elongation of a rolled magnetic metal strip which comprises the processes of detecting at the outlet side of a work roll assembly the value of a difference between the electrical signals representing changes in inductance corresponding to the displacements of said metal strip in the direction of its thickness as determined with respect to a longitudinal unit interval on the surface of the metal strip which is considerably shorter than the average wavelength of undulations occurring on said surface in the longitudinal direction thereof, said determination being repeated at a plurality of prescribed points distributed over a distance in the longitudinal direction which is much larger than the average wavelength of the aforesaid undulations, namely, is equal to an integral multiple of the aforementioned unit interval, squaring each of a plurality of differential values thus obtained and summing up said squared differential values thereby to obtain a signal representing the degree of elongation of the metal strip.
Claim 5
Dependent Claim
73 words
A method according to claim 1 wherein the process of detecting the two electrical signals and the difference therebetween comprises a process of obtaining electrical signals representing changes in inductance from two induction detecting circuits arranged at a prescribed interval in the travelling direction of the metal strip, a process of supplying outputs from said process to an AC bridge circuit and a process of demodulating the outputs from said AC bridge circuit.
Claim 6
Dependent Claim
72 words
A method according to claim 2 wherein the process of detecting the electrical signals and the difference therebetween comprises a process of obtaining electrical signals representing changes in inductance from two induction detecting circuits arranged at a prescribed interval in the travelling direction of the metal strip, a process of supplying outputs from said process to an AC bridge circuit and a process of demodulating the outputs from said AC bridge circuit.
Claim 7
Dependent Claim
46 words
A method according to claim 3 wherein the AC bridge circuit is previously brought to a balance state under the condition in which there is introduced a magnetic metal strip and there is involved a process of obtaining phase modulated outputs from said AC bridge cIrcuit.
Claim 8
Dependent Claim
47 words
A method according to claim 3 wherein the AC bridge circuit is previously brought to a balanced state under the condition in which there is not introduced a magnetic metal strip and there is involved a process of obtaining amplitude modulated outputs from said AC bridge circuit.
Claim 9
Independent Claim
124 words
An apparatus for determining during operation the degree of elongation of a rolled magnetic metal strip which comprises at least two induction detecting means arranged at a prescribed interval in the travelling direction of the metal strip for detecting at the outlet side of work roll assembly electrical signals representing changes in inductance corresponding to the displacements of the metal strip in the direction of its thickness, means for determining the value of a difference between the two detected signals corresponding to the amount of displacement of the metal strip in the direction of its thickness as determined with respect to the aforesaid interval and means for squaring said differential value to obtain a signal representing the degree of elongation of the metal strip.
Claim 10
Independent Claim
124 words
An apparatus for determining during operation the degree of elongation of a rolled magnetic metal strip which comprises at least two induction detecting means arranged at a prescribed interval in the travelling direction of the metal strip for detecting at the outlet side of work roll assembly electrical signals representing changes in inductance corresponding to the displacements of the metal strip in the direction of its thickness, means for determining the value of a difference between the two detected signals corresponding to the amount of displacement of the metal strip in the direction of its thickness as determined with respect to the aforesaid interval and means for squaring said differential value to obtain a signal representing the degree of elongation of the metal strip.
Claim 11
Independent Claim
168 words
An apparatus for determining during operation the degree of elongation of a rolled magnetic metal strip; which comprises means for detecting at the outlet side of a work roll assembly the value of a difference between the electrical signals representing changes in induction corresponding to the displacements of said metal strip in the direction of its thickness as determined with respect to a longitudinal unit interval on the surface of the metal strip which is considerably shorter than the average wavelength of undulations occurring on said surface in the longitudinal direction thereof, said determination being repeated at a plurality of prescribed points distributed over a distance in the longitudinal direction which is much longer than the average wavelength of said undulations, so as to represent an integral multiple of said unit interval, squaring means for squaring each of a plurality of differential values thus determined and adding means for summing up said squared values thereby to obtain a signal representing the degree of elongation of the metal strip.
Claim 12
Independent Claim
168 words
An apparatus for determining during operation the degree of elongation of a rolled magnetic metal strip; which comprises means for detecting at the outlet side of a work roll assembly the value of a difference between the electrical signals representing changes in induction corresponding to the displacements of said metal strip in the direction of its thickness as determined with respect to a longitudinal unit interval on the surface of the metal strip which is considerably shorter than the average wavelength of undulations occurring on said surface in the longitudinal direction thereof, said determination being repeated at a plurality of prescribed points distributed over a distance in the longitudinal direction which is much longer than the average wavelength of said undulations, so as to represent an integral multiple of said unit interval, squaring means for squaring each of a plurality of differential values thus determined and adding means for summing up said squared values thereby to obtain a signal representing the degree of elongation of the metal strip.
Claim 13
Dependent Claim
71 words
A apparatus according to claim 7 wherein the at least two means for detecting electrical signals includes two induction detecting circuits arranged at a prescribed interval in the travelling direction of the metal strip and the means for detecting a difference between said signals comprises and AC bridge circuit which is supplied with outputs from said induction detecting circuits and a demodulator for demodulating the outputs from said AC bridge circuit.
Claim 14
Dependent Claim
68 words
An apparatus according to claim 8 wherein the means for detecting electrical signals includes two induction detecting circuits arranged at a prescribed interval in the travelling direction of the metal strip and the means for detecting a difference between said signals comprises an AC bridge circuit which is supplied with outputs from said induction detecting circuits and a demodulator for demodulating the outputs from said AC bridge circuit.
References Cited (Backward Citations)
US3256610A
Cited
US3502968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |