US3854329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for web tension measurement
Assignee: Masson Scott Thrissell Engineering Ltd
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Filing: 1972-11-21
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Granted: 1974-12-17
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Expires: 1992-11-21
Abstract
Abstract Tension in a web of paper is measured by exciting transverse vibrations in the web, by means of a moving coil loudspeaker, sensing the vibrations by means of a microphone, and applying part of the output of an amplifier; connected between the microphone and the loudspeaker, via a frequency-to-voltage converter, to a meter which is adapted to give a reading indicative of the web tension. The apparatus may be used as a portable device or fitted to a machine to control the braking torque applied to a reel of paper by comparing the signal from the converter with a reference signal, and using the resultant signal to control the applied braking torque.
Inventors
- 👤 G Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:21
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/04; G01L5/042
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
Apparatus for measuring tension of a web stretched between supports, comprising means for exciting transverse vibrations in said web, first and second sensors positioned at first and second distances respectively along the web from said exciting means, and means responsive to signals from both said sensors being provided for converting the time interval between the sensing of the vibration in the web, caused by said exciting means, at said first and said second sensors into an indication of the tension of said web.
Claim 2
Dependent Claim
83 words
Apparatus for measuring tension of a web stretched between supports, comprising means for exciting transverse vibrations in said web, first and second sensors positioned at first and second distances respectively along the web from said exciting means, and means responsive to signals from both said sensors being provided for converting the time interval between the sensing of the vibration in the web, caused by said exciting means, at said first and said second sensors into an indication of the tension of said web.
Claim 3
Dependent Claim
16 words
Apparatus as claimed in claim 1 in which said exciting means comprises a moving coil loudspeaker.
Claim 4
Dependent Claim
16 words
Apparatus as claimed in claim 1 in which said exciting means comprises a white noise generator.
Claim 5
Dependent Claim
24 words
Apparatus as claimed in claim 1 in which said exciting means comprises pneumatic means for directing an airstream against the edge of said web.
Claim 6
Dependent Claim
17 words
Apparatus as claimed in claim 1 in which at least one of said sensors comprises a microphone.
Claim 7
Dependent Claim
18 words
Apparatus as claimed in claim 1 in which at least one of said sensors comprises a photo-electric device.
References Cited (Backward Citations)
US1948104A
Cited
US3394587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |