US3749136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tension control device
Assignee: Individual
•
Filing: 1971-10-13
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Granted: 1973-07-31
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Expires: 1991-10-13
Abstract
Abstract A tension control device in the form of a let-off for a loom beam or the like is disclosed for varying the speed of rotation of the beam to maintain constant tension in the warp yarn as the yarn is removed from the beam. The let-off includes a brake drum with a band extending therearound in operative association with the loom beam and a sensing means, whereby the frictional contact between the brake drum and flexible band is varied responsive to variations in tension in the warp yarn being let off the beam, which, in turn, controls the rotation of the loom beam and maintains a constant tension on the unwinding yarn.
Inventors
- 👤 D Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:48
CPC Classifications
D; D03; D03D; D03D49/00; D03D49/04; D03D49/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
230 words
Apparatus for automatically controlling the rate of rotation of a storage roll responsive to variations in tension of material extending from said roll to maintain substantially constant tension on such material comprising a shaft, means associated with said shaft coupling said shaft in driving relation with a storage roll, braking means carried on said shaft, a member positioned adjacent said braking means, a band extending from said member around said braking means in frictional contact therewith, and means adapted to sense the tension of material being unwound from a storage roll and apply a force to said band proportional to the tension in such material to vary the frictional contact between said braking means and said band responsive to variation of tension in said material, whereby rotation of such a storage roll is varied according to variations in tension in material unwinding therefrom,said tension sensing means including a tension roller having thE material being unwound from a storage roll coming into more than tangential contact with said tension roller, means linked to said tension roller for exerting a substantially constant force on said tension roller throughout the travel of said tension roller against the force exerted by the tension of the material being unwound from the storage roll and said band being loosened on said braking means as the tension in the material being unwound from the storage roll increases.
Claim 2
Dependent Claim
230 words
Apparatus for automatically controlling the rate of rotation of a storage roll responsive to variations in tension of material extending from said roll to maintain substantially constant tension on such material comprising a shaft, means associated with said shaft coupling said shaft in driving relation with a storage roll, braking means carried on said shaft, a member positioned adjacent said braking means, a band extending from said member around said braking means in frictional contact therewith, and means adapted to sense the tension of material being unwound from a storage roll and apply a force to said band proportional to the tension in such material to vary the frictional contact between said braking means and said band responsive to variation of tension in said material, whereby rotation of such a storage roll is varied according to variations in tension in material unwinding therefrom,said tension sensing means including a tension roller having thE material being unwound from a storage roll coming into more than tangential contact with said tension roller, means linked to said tension roller for exerting a substantially constant force on said tension roller throughout the travel of said tension roller against the force exerted by the tension of the material being unwound from the storage roll and said band being loosened on said braking means as the tension in the material being unwound from the storage roll increases.
Claim 3
Dependent Claim
124 words
The apparatus as set forth in claim 1, wherein said member includes an elongated arm, means for pivotally supporting one end of said arm, an inner post and an outer post carried on said arm spaced radially from the center of said braking means, said band extending around said braking means and said outer post and between said inner and outer post with said inner post bearing against one surface of said band, said sensing means adapted to cause said arm to pivot responsive to variation in tension of said material causing inner post to exert pressure on said band for varying the friction contact between said band and said braking means responsive to variations in tension in material extending from a storage roll.
Claim 4
Dependent Claim
208 words
A let-off device for use in combination with a loom beam and warp yarn being drawn from the loom beam to vary the speed of rotation of said beam in response to variations in the tension of the warp yarn being removed from said beam to maintain substantially constant tension of such yarn, comprising a shaft, means coupling said shaft to said loom beam, a braking drum mounted on one end of said shaft, a band extending about said braking drum in frictional contact with said drum, and sensing means operatively connected to said band adapted to sense the tension on said warp yarn, whereby the tension exerted by said warp yarn is transmitted to said brakedrum to vary the rotation of said loom beam in response to variations in the tension exerted against said warp yarn, said sensing means including a tension roller having the warp yarn coming into more than tangential contact with said tension roller, means linked to said tension roller for exerting a substantially constant force on said tension roller throughout the travel of said tension roller against the force exerted by the tension of the warp yarn and said band being loosened on said brakedrum as the tension in said warp yarn increases.
Claim 5
Dependent Claim
208 words
A let-off device for use in combination with a loom beam and warp yarn being drawn from the loom beam to vary the speed of rotation of said beam in response to variations in the tension of the warp yarn being removed from said beam to maintain substantially constant tension of such yarn, comprising a shaft, means coupling said shaft to said loom beam, a braking drum mounted on one end of said shaft, a band extending about said braking drum in frictional contact with said drum, and sensing means operatively connected to said band adapted to sense the tension on said warp yarn, whereby the tension exerted by said warp yarn is transmitted to said brakedrum to vary the rotation of said loom beam in response to variations in the tension exerted against said warp yarn, said sensing means including a tension roller having the warp yarn coming into more than tangential contact with said tension roller, means linked to said tension roller for exerting a substantially constant force on said tension roller throughout the travel of said tension roller against the force exerted by the tension of the warp yarn and said band being loosened on said brakedrum as the tension in said warp yarn increases.
Claim 6
Dependent Claim
106 words
The let-off device of claim 3 in which said sensing means further includes a pivotally supported elongated arm, an inner post and an outer post carried on said arm spaced radially from the center of said braking drum, and said band extends from said outer post around said brakedrum in contact with said inner post bearing against one surface thereof, a lever arm pivotally supported with said elongated arm and constrained to move therewith, said tension roller being operatively connected to said lever arm, whereby said lever arm and elongated arm are movable in response to variations exerted against said sensing means by said warp yarn.
Claim 7
Dependent Claim
99 words
The let-off device of claim 4 in which said coupling means includes a beam gear, a rotatable shaft having a gear on one end thereof meshed with said beam gear, a worm wheel carried in fixed relationship on the other end of said rotatable shaft, and a worm gear fixed to said shaft on which said brake drum is carried, whereby as the frictional contact between said band and said brake drum varies, the force applied to said drum varies to control the rate of rotation of said loom beam to maintain substantially constant tension against said warp yarn.
Claim 8
Dependent Claim
31 words
The let-off device of claim 4 in which said sensing means further includes a flexible cable operably connected to said tension roller at one end and extending to said lever arm.
Claim 9
Dependent Claim
69 words
The let-off device of claim 3 in which said means linked to said tension roller for exerting a substantially constant force on said tension roller throughout the travel of said tension roller includes an arm connected to said roller and wEight means operatively connected to said arm through a chain and sprocket, whereby said roller is forced against said unwinding warp yarn to exert a predetermined tension there against.
Claim 10
Dependent Claim
231 words
A let-off device for use in combination with a loom beam to maintain substantially constant tension on warp yarns being drawn from the loom beam, comprising a shaft rotatably mounted on the loom, means coupling said shaft to the loom beam, brake means for retarding the loom beam to maintain the substantially constant tension on the warp yarn, said brake means being positioned to operate on said shaft, a tension roller, said tension roller having the warp yarn coming into more than tangential contact therewith, means for operably mounting said tension roller on the loom, said tension roller mounting means constraining said tension roller to move along a fixed path, the force resulting on the tension roller from the tensioned warp yarn tending to cause said tension roller to move along the fixed path in a first direction, sensing means, said sensing means being coupled with said tension roller to move with said tension roller along the fixed path, means linking said brake means to said sensing means to decrease the braking of the loom beam as said tension roller moves along the fixed path in the first direction, means for exerting force tending to cause said tension roller to move in a second direction opposite the first direction along the fixed path, said force exerting means being substantially constant at all positions of said tension roller along the fixed path.
Claim 11
Dependent Claim
231 words
A let-off device for use in combination with a loom beam to maintain substantially constant tension on warp yarns being drawn from the loom beam, comprising a shaft rotatably mounted on the loom, means coupling said shaft to the loom beam, brake means for retarding the loom beam to maintain the substantially constant tension on the warp yarn, said brake means being positioned to operate on said shaft, a tension roller, said tension roller having the warp yarn coming into more than tangential contact therewith, means for operably mounting said tension roller on the loom, said tension roller mounting means constraining said tension roller to move along a fixed path, the force resulting on the tension roller from the tensioned warp yarn tending to cause said tension roller to move along the fixed path in a first direction, sensing means, said sensing means being coupled with said tension roller to move with said tension roller along the fixed path, means linking said brake means to said sensing means to decrease the braking of the loom beam as said tension roller moves along the fixed path in the first direction, means for exerting force tending to cause said tension roller to move in a second direction opposite the first direction along the fixed path, said force exerting means being substantially constant at all positions of said tension roller along the fixed path.
Claim 12
Dependent Claim
38 words
The device of claim 7 in which said means for exerting substantially constant force on said tension roller includes weights, a pulley, and a flexible tying means for connecting said weights to said tension roller over said pulley.
Claim 13
Dependent Claim
58 words
The device of claim 8 in which said means for exerting substantially constant force on said tension roller includes an arm pivotally mounted to the loom, weights pivotally depending from said arm, said arm including bracket means for engaging said tension roller, said bracket means constraining said arm to move with said tension roller at said bracket means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |