Patent JPS6262949A successfully refreshed from Google Patents.
US3686460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the temperature of an inductively heated draw roll
Assignee: Maschinenfabrik Rieter AG
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Filing: 1971-07-21
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Granted: 1972-08-22
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Expires: 1991-07-21
Abstract
Abstract The signal processing device for controlling the supply of heat energy to the heating coil utilizes a circuit in which a signal is produced in proportion to the resistance of the roll. The signal is obtained from signals proportional to the voltage measured in the coil and the current in the coil. The proportional signal is then used to shut off or open the supply of heat energy to the coil if the signal exceeds or falls below a pre-set signal corresponding to the desired roll temperature.
Inventors
- 👤 Hansruedi Lamparter
- 👤 Gelli Anton Spescha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/14; H05B6/145; D; D02; D02J; D02J13/00; D02J13/005; G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/24; G05D23/2401
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
In combination with a rotatable thread transporting roll for endless filaments having an internal roll wall, a stationary iron core arranged coaxially within said roll wall, an induction coil surrounding said core, and a source of alternating current for generating an alternating magnetic flux in said roll wall to heat said roll; a valve for controlling the heating energy supplied to said induction coil, a control device for activating said valve, and a signal processing device connected to said control device and including a connection to said coil for transmitting a signal proportional to the voltage applied to said coil, a connection for transmitting a signal proportional to the current in said coil and means for transforming said signals into a signal proportional to the resistance of said roll for transmission to said control device.
Claim 2
Dependent Claim
135 words
In combination with a rotatable thread transporting roll for endless filaments having an internal roll wall, a stationary iron core arranged coaxially within said roll wall, an induction coil surrounding said core, and a source of alternating current for generating an alternating magnetic flux in said roll wall to heat said roll; a valve for controlling the heating energy supplied to said induction coil, a control device for activating said valve, and a signal processing device connected to said control device and including a connection to said coil for transmitting a signal proportional to the voltage applied to said coil, a connection for transmitting a signal proportional to the current in said coil and means for transforming said signals into a signal proportional to the resistance of said roll for transmission to said control device.
Claim 3
Dependent Claim
46 words
The combination as set forth in claim 1 wherein said means for forming said signal proportional to the resistance of said roll forms a quotient of said signal proportional to the voltage applied to said coil and said signal proportional to the current in said coil.
Claim 4
Dependent Claim
46 words
The combination as set forth in claim 1 wherein said means for forming said signal proportional to the resistance of said roll forms a difference of said signal proportional to the voltage applied to said coil and said signal proportional to the current in said coil.
Claim 5
Dependent Claim
27 words
The combination as set forth in claim 1 wherein said means for forming said signal proportional to the resistance of said roll is a bridge circuit arrangement.
Claim 6
Dependent Claim
20 words
The combination as set forth in claim 1 wherein said signals are formed during a heating period at network frequency.
Claim 7
Dependent Claim
27 words
The combination as set forth in claim 1 wherein said signals are formed during a heating period with a voltage having a frequency different from network frequency.
Claim 8
Dependent Claim
24 words
The combination as set forth in claim 1 wherein said signals are formed between two heating periods with a measuring voltage of predetermined frequency.
Claim 9
Dependent Claim
17 words
The combination as set forth in claim 1 wherein said control device includes an impulse ratio control.
Claim 10
Dependent Claim
16 words
The combination as set forth in claim 1 wherein said control device includes an amplitude control.
Claim 11
Dependent Claim
17 words
The combination as set forth in claim 9 wherein said amplitude control is a phase angle control.
Claim 12
Dependent Claim
22 words
The combination as set forth in claim 9 wherein said amplitude control is an adjustable transformer for varying the applied heating voltAge.
References Cited (Backward Citations)
US3242302A
Cited
US3441702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |