US3552645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for web heat treating apparatus
Assignee: Faustel Inc
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Filing: 1968-12-10
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Granted: 1971-01-05
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Expires: 1988-12-10
Abstract
Abstract A temperature sensing means for ascertaining the temperature of a heated moving web includes a sensory means generating an electric signal responsive to the radiation emanating from the web. A control means generating a signal in opposition to the signal of the sensory means provides an error signal equal to the difference between the desired and sensed temperatures of the web. The temperature sensing means includes means for compensating for the emissivity of the web. The temperature sensing means may be incorporated in a temperature control system having an electromechanical means responsive to the error signal for controlling the heat supplied by a web heating apparatus to the web so that the actual temperature of the web equals the desired temperature.
Inventors
- 👤 Shelton F Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:32
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/0022; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1925; G05D23/27
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
274 words
A temperature control system for regulating the temperature level of a heated moving web passing through web heat treating apparatus to a desired temperature level, said apparatus having a controllable heating means for applying heat to the web, said web emanating radiation in accordance with its temperature and an unknown emissivity factor, said system comprising: a sensory means positioned adjacent said web and exposed to the radiation emanating therefrom, said means being responsive to said radiation for providing and an electric signal corresponding in magnitude to said radiation; control means including electric signal means, said electric signal means being connected to said sensory means for providing an electric signal of a preselected magnitude in electrical opposition to the electric signal of said sensory means, said control means also containing deviation sensing means responsive to a said electric signals for determining when a condition of magnitude equality exists between said signals and for providing an error signal corresponding to a deviation from said condition of equality, said deviation sensing means comprising a null type, high gain amplifier; means for altering one of said electric signals from said sensory means and said electric signal means to compensate for the emissivity of said moving web, so that said electric signals are in a condition of magnitude equality when the web is at the desired temperature level; and electromechanical means responsive to the error signal from said deviation sensing means and connected to said heating means for controlling said heating means and the heat applied to the web in accordance with the error signal for causing the temperature level of said web to equal the desired temperature level.
Claim 2
Dependent Claim
274 words
A temperature control system for regulating the temperature level of a heated moving web passing through web heat treating apparatus to a desired temperature level, said apparatus having a controllable heating means for applying heat to the web, said web emanating radiation in accordance with its temperature and an unknown emissivity factor, said system comprising: a sensory means positioned adjacent said web and exposed to the radiation emanating therefrom, said means being responsive to said radiation for providing and an electric signal corresponding in magnitude to said radiation; control means including electric signal means, said electric signal means being connected to said sensory means for providing an electric signal of a preselected magnitude in electrical opposition to the electric signal of said sensory means, said control means also containing deviation sensing means responsive to a said electric signals for determining when a condition of magnitude equality exists between said signals and for providing an error signal corresponding to a deviation from said condition of equality, said deviation sensing means comprising a null type, high gain amplifier; means for altering one of said electric signals from said sensory means and said electric signal means to compensate for the emissivity of said moving web, so that said electric signals are in a condition of magnitude equality when the web is at the desired temperature level; and electromechanical means responsive to the error signal from said deviation sensing means and connected to said heating means for controlling said heating means and the heat applied to the web in accordance with the error signal for causing the temperature level of said web to equal the desired temperature level.
Claim 3
Dependent Claim
141 words
The temperature control system of claim 1 wherein said means for altering one of the signals comprises means including a heatable body capable of emanating radiation in accordance with its temperature and a temperature control system connected to a said body for raising and maintaining the temperature of said body at the desired temperature level of said web, said sensory means being positioned with respect to said body for receiving only the radiation from said body, so that in the absence of said web, said sensory means provides a signal corresponding to the desired temperature level of said web, said web passing between said body and said sensory means so that deviations in the temperature thereof with respect to the desired temperature level cause corresponding deviations in the output signal of said sensory means and the condition of said electric signals.
Claim 4
Dependent Claim
37 words
The temperature control system of claim 2 wherein said heatable body comprises a U-shaped trough partially surrounding said web and providing an exposed portion of said web and trough which may be observed by said sensory means.
Claim 5
Dependent Claim
61 words
The temperature control system of claim 3 wherein said U-shaped through includes a portion lying on one side of said web, a portion positioned partially on the other side of said web, and a portion connecting the aforesaid portions, said portion positioned partially on the other side of said web exposing said web and trough for observation by said sensory means.
Claim 6
Dependent Claim
73 words
The temperature control system of claim 3 wherein said temperature control means includes an adjustable electrical power supply, an electric heater connected to the output of said power supply and tO said body for heating said body, and temperature responsive means connected to said body for sensing the temperature thereof and for altering the output of said power supply for maintaining the temperature of said body at the desired temperature of said web.
Claim 7
Dependent Claim
64 words
The temperature control system of claim 1 wherein said means for altering one of said electric sing signals comprises means operatively associated with said electric signal means for altering electric signals produced by said means to bring the electric signals of said sensory means and said electric signal means into a condition of magnitude equality when said web is at the desired temperature level.
Claim 8
Dependent Claim
23 words
The temperature control system of claim 1 wherein said sensory means is responsive to the entire spectrum of radiation emanating from said web.
Claim 9
Dependent Claim
69 words
The temperature control system of claim 7 wherein said sensory means includes a thermopile exposed to the radiation emanating from the web for providing an electric signal corresponding to the amount of said radiation and also includes a means connected to said thermopile and responsive to the ambient temperature to which the thermopile is exposed for altering said electric signal to provide ambient temperature compensation to said sensory means.
Claim 10
Dependent Claim
18 words
The temperature control system according to claim 1 wherein said amplifier is of the pulse amplitude modulation type.
Claim 11
Dependent Claim
68 words
The temperature control system according to claim 1 wherein said electromechanical means includes an electric means responsive to said error signal, pneumatic means operable by said electric means for providing pneumatic pressure proportional to said error signal, and pneumatically operated mechanical means connected to said pneumatic means and to said heating means for controlling said heating means in accordance with the pneumatic pressure provided by said pneumatic means.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |