Patent US3667664A successfully refreshed from Google Patents.
US3667664A
Expired / Lapsed
US
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Apparatus for keeping a state of tension constant on a material web which runs between successive pairs of driving rollers
Assignee: Weber Paul AG
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Filing: 1970-02-26
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Granted: 1972-06-06
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Expires: 1990-02-26
Abstract
Abstract An apparatus for keeping a state of tension constant on a material web which runs between successive pairs of driving rollers includes a torsion bar having a lever extension with a guide roller over which the material is directed. Sensing means are associated with the lever to sense variations of the torsion acting on the bar through the displacement of the lever by the variations in tension of the material which is being fed and this sensing means is connected to electrical control means for varying the speed of one or the other set of rollers or for braking the speed of one of the sets of the rollers in order to vary the tension on the web material which is fed.
Inventors
- 👤 Peter Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:56
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/43; B; B65; B65H; B65H23/00; B65H23/04; B65H23/044; B65H59/00; B65H59/38; B65H59/384; B65H59/388; G05; G05D; G05D15/00; G05D15/01; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
235 words
An apparatus for monotoring a predetermined tension on a web, comprising a first and a second set of feed rollers dispoSed in spaced relationship and arranged for feeding the web therebetween, motor speed control means connected to at least one of said first and second sets of feed rollers for driving said set of feed rollers at a speed distinct from that of the other set of feed rollers for imparting a predetermined nominal tension to the web being fed therebetween, a scanning roller located between said first and second sets of feed rollers and arranged in contact with the web being fed therebetween, a lever system connected to said scanning roller and comprising a pair of laterally spaced levers each connected at one end to the opposite ends of said scanning roller and the opposite ends of said levers being rigidly interconnected, a fixed support, a torsion bar positioned on he pivotal axis of said lever system and secured to said fixed support and means engageable with said lever system and connected to said motor speed control means to actuate said motor speed control means in accordance with the deflection translated from said scanning roller to the at least one of said torsion bar and said lever to drive one of said sets of feed rollers at a speed to restore said torsion bar and said lever system to a predetermined nominal setting position.
Claim 2
Independent Claim
235 words
An apparatus for monotoring a predetermined tension on a web, comprising a first and a second set of feed rollers dispoSed in spaced relationship and arranged for feeding the web therebetween, motor speed control means connected to at least one of said first and second sets of feed rollers for driving said set of feed rollers at a speed distinct from that of the other set of feed rollers for imparting a predetermined nominal tension to the web being fed therebetween, a scanning roller located between said first and second sets of feed rollers and arranged in contact with the web being fed therebetween, a lever system connected to said scanning roller and comprising a pair of laterally spaced levers each connected at one end to the opposite ends of said scanning roller and the opposite ends of said levers being rigidly interconnected, a fixed support, a torsion bar positioned on he pivotal axis of said lever system and secured to said fixed support and means engageable with said lever system and connected to said motor speed control means to actuate said motor speed control means in accordance with the deflection translated from said scanning roller to the at least one of said torsion bar and said lever to drive one of said sets of feed rollers at a speed to restore said torsion bar and said lever system to a predetermined nominal setting position.
Claim 3
Dependent Claim
24 words
An apparatus, according to claim 1, wherein said torsion bar is of a size selected in accordance with the tension desired and is exchangeable.
Claim 4
Dependent Claim
70 words
An apparatus, according to claim 1, wherein said means engageable with at least one of said torsion bar and said lever comprises a potentiometer having a rotary member for setting the voltage difference in accordance with the setting of said torsion bar and/or said lever, said potentiometer being connected to said motor speed control means and providing directly as a control for varying the speed of said driving roller sets.
Claim 5
Dependent Claim
49 words
An apparatus, according to claim 1, wherein a feeler arranged in bearing relationship with at least one of said levers and being displaceable by movement of said lever and being connected to said motor speed control means for varying the speed of one of said sets of feed rollers.
Claim 6
Dependent Claim
101 words
An apparatus, according to claim 1, wherein a first fixed deflecting roller is located between said first set of feed rollers and said scanning roller, a second fixed deflecting roller located between said second set of feed rollers and said scanning roller, and the axis of said first and second fixed deflecting rollers being located in a plane spaced from the axis of said scanning roller so that the web passing between said first and second sets of feed rollers is guided over said first and second fixed deflecting rollers and said scanning roller for forming a loop in the web.
Claim 7
Dependent Claim
93 words
An apparatus, according to claim 5, including a fixed plate positioned adjacent to said lever system, a movable plate mounted on said fixed plate for movement toward and away from at least one of said levers, a transmitter mounted on said movable plate and having a sensing finger extending outwardly therefrom and engaged with said lever and being deflectable by said lever upon movement thereof upon torsioning of said torsion bar, and means connected to said movable plate for adjusting the position of said movable plate with said transmitter and said sensing finger.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |