US3921876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for regulating the tension in webs of material
Assignee: Individual
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Filing: 1974-10-07
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Granted: 1975-11-25
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Expires: 1994-10-07
Abstract
Abstract A device for regulating tension in a continuously moving web of paper consists of a third order lever having a tension sensing roller at the end remote from its pivot and a brake pad between the roller and pivot, the brake pad serving to resist rotation of a roll which frictionally engages the web.
Inventors
- 👤 Louis Corse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:40
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/18; B65H23/188; B65H23/1888; B65H2511/00; B65H2511/10; B65H2511/11; B65H2511/112; B65H2513/00; B65H2513/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
272 words
A device for regulating tension in a web of Sheet material comprising: a. a pair of opposed rolls making frictional contact with a web of sheet material traveling in a longitudinal direction thereof and passing between said pair of opposed rolls; b. a pivoted lever having one end thereof disposed on a pivot axis, said pivot axis being disposed upstream of said pair of opposed rolls relative to the direction of travel of said web of sheet material, said pivoted lever extending in the direction of travel of said web of sheet material and having a bent end portion remote from said pivot axis and bent toward said web of sheet material whereby said pivoted lever remains in use subsantially parallel to said web of sheet material; c. a gravity-biased roller disposed on the bent end portion of said lever downstream from said pair of opposed rolls and bearing against said web of sheet material under the influence of gravity; d. a brake shoe disposed on said pivoted lever adjacent an upper one of said opposed rolls for applying a braking force thereto, said braking force having a magnitude determined by said gravity-biased roller sensing tension in said web of sheet material and changing position in response to changes in said tension to change said braking force applied to said pair of opposed rolls thereby regulating said tension in said web; and e. a third roll disposed to change the direction of advance of said web by about ninety degrees as it passes over said gravity-biased roller to maximize the change in braking force in response to a change in said tension.
Claim 2
Independent Claim
272 words
A device for regulating tension in a web of Sheet material comprising: a. a pair of opposed rolls making frictional contact with a web of sheet material traveling in a longitudinal direction thereof and passing between said pair of opposed rolls; b. a pivoted lever having one end thereof disposed on a pivot axis, said pivot axis being disposed upstream of said pair of opposed rolls relative to the direction of travel of said web of sheet material, said pivoted lever extending in the direction of travel of said web of sheet material and having a bent end portion remote from said pivot axis and bent toward said web of sheet material whereby said pivoted lever remains in use subsantially parallel to said web of sheet material; c. a gravity-biased roller disposed on the bent end portion of said lever downstream from said pair of opposed rolls and bearing against said web of sheet material under the influence of gravity; d. a brake shoe disposed on said pivoted lever adjacent an upper one of said opposed rolls for applying a braking force thereto, said braking force having a magnitude determined by said gravity-biased roller sensing tension in said web of sheet material and changing position in response to changes in said tension to change said braking force applied to said pair of opposed rolls thereby regulating said tension in said web; and e. a third roll disposed to change the direction of advance of said web by about ninety degrees as it passes over said gravity-biased roller to maximize the change in braking force in response to a change in said tension.
Claim 3
Dependent Claim
67 words
A device for regulating tension in a web of sheet material according to claim 1, having a product Kf on the order of one hundred wherein f is the coefficient of friction between said brake shoe and said opposed rolls and K is the ratio of the distance between said pivot axis and said gravity-biased roller to the distance between said pivot axis and said brake shoe.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |