US3861207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring web tension
Assignee: Eastman Kodak Co
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Filing: 1973-12-20
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Granted: 1975-01-21
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Expires: 1993-12-20
Abstract
Abstract Apparatus is provided for measuring the tension of a web stretched between two supporting members. The web is positioned over an arcuate surface in which apertures are arranged in a plurality of rectangular patterns. Angled air jets, forced from these apertures, form substantially isolated air cushions within each rectangular pattern which support the web and provide a desired clearance between it and the arcuate surface. The tension in a section of the web supported by a given air cushion is determined by sensing the air pressure in that air cushion at a pressure tap hole provided in the center of the rectangular pattern of apertures used to generate the air cushion.
Inventors
- 👤 Eugene H Barbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:25
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/04; G01L5/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
Apparatus for measuring the tension in a web, which apparatus comprises: a. an arcuate surface over which the web is passed, said surface having apertures through which a fluid is supplied under pressure to provide a supporting fluidic cushion between the under surface of the web and said surface, said apertures being arranged in at least one closed, continuous pattern; b. supply means for continuously supplying said fluid under pressure to said apertures; c. at least one pressure tap hole in said surface, said pressure tap hole being positioned within the space enclosed by said closed, continuous pattern of said apertures; and d. pressure measuring means in communication with said pressure tap hole for indicating the pressure of said fluid in said fluidic cushion in the vicinity of said pressure tap hole.
Claim 2
Dependent Claim
132 words
Apparatus for measuring the tension in a web, which apparatus comprises: a. an arcuate surface over which the web is passed, said surface having apertures through which a fluid is supplied under pressure to provide a supporting fluidic cushion between the under surface of the web and said surface, said apertures being arranged in at least one closed, continuous pattern; b. supply means for continuously supplying said fluid under pressure to said apertures; c. at least one pressure tap hole in said surface, said pressure tap hole being positioned within the space enclosed by said closed, continuous pattern of said apertures; and d. pressure measuring means in communication with said pressure tap hole for indicating the pressure of said fluid in said fluidic cushion in the vicinity of said pressure tap hole.
Claim 3
Dependent Claim
23 words
Apparatus as claimed in claim 1 wherein said apertures are inclined inwardly toward the center of said closed, continuous patterns of said apertures.
Claim 4
Dependent Claim
28 words
Apparatus as claimed in claim 2 wherein said apertures are arranged as at least two adjacent rectangles along an axis transverse to the longitudinal axis of said web.
Claim 5
Dependent Claim
26 words
Apparatus as claimed in claim 3 wherein said surface contains at least one pressure tap hole located within the boundary of each rectangular pattern of apertures.
Claim 6
Dependent Claim
11 words
Apparatus as claimed in claim 1 wherein said fluid comprises air.
Claim 7
Dependent Claim
14 words
Apparatus as claimed in claim 1 wherein said pressure measuring means comprises a manometer.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |