US3737115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Web-transisioning apparatus
Assignee: Wilton James Ltd
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Filing: 1971-05-10
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Granted: 1973-06-05
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Expires: 1991-05-10
Abstract
Abstract Apparatus for automatically tensioning a web of material being drawn from a reel, utilizing a belt engaging the side of the reel, the belt being in the form of a continuous loop contacting the reel surface and being driven in use of the apparatus to reduce the relative speed between the contacting surfaces of the belt and reel which might result in damage to the reel material, the belt being associated also with compensating means for maintaining a substantially constant tension throughout the life of the reel despite the gradual reduction in reel diameter.
Inventors
- 👤 N Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:31
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/06; B65H23/08; B65H23/085
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
190 words
Apparatus for tensioning a web of material as it is drawn from a reel of the material, comprising a. at least one tensioning belt engageable with the surface of the reel in order to create a drag and hence tension the web, i. which belt is in the form of a continuous loop drivable at a speed such as to reduce the relative speed between the contacting surfaces of the belt and the reel, b. a movable pulley around which the belt passes, c. a tensioning device controlling the movement of the pulley so as to vary the tension in the belt and control the web tension, and d. compensating means between the tensioning device and the pulley capable of modifying the force applied to the pulley in response to changes in the output of the tensioning device, i. so as to vary the ratio between the tension applied by the tensioning device and that imparted to the belt by the pulley, ii. in a sense which produces a greater increase in belt tension for a given increase in tension applied by the tensioning device, as the reel diameter decreases.
Claim 2
Dependent Claim
190 words
Apparatus for tensioning a web of material as it is drawn from a reel of the material, comprising a. at least one tensioning belt engageable with the surface of the reel in order to create a drag and hence tension the web, i. which belt is in the form of a continuous loop drivable at a speed such as to reduce the relative speed between the contacting surfaces of the belt and the reel, b. a movable pulley around which the belt passes, c. a tensioning device controlling the movement of the pulley so as to vary the tension in the belt and control the web tension, and d. compensating means between the tensioning device and the pulley capable of modifying the force applied to the pulley in response to changes in the output of the tensioning device, i. so as to vary the ratio between the tension applied by the tensioning device and that imparted to the belt by the pulley, ii. in a sense which produces a greater increase in belt tension for a given increase in tension applied by the tensioning device, as the reel diameter decreases.
Claim 3
Dependent Claim
106 words
A web tensioning apparatus according to claim 1 wherein the compensating means includes a pivoted cam to which a torque is arranged to be applied by the tensioning device, a carriage supporting the movable pulley, a strap connected to the carriage, said strap being arranged to be wrapped around the pivoted cam as the cam is rotated to increase the tension in the belt, the distance of the active part of the cam surface from the cam pivot decreasing as a cam is rotated to tighten the strap, thereby increasing the tension in the strap for a given applied turning force as the reel diameter decreases.
Claim 4
Dependent Claim
49 words
A web tensioning apparatus according to claim 2 wherein the strap is secured to the cam surface, wherein a further pulley is provided and the cam is rigidly attached to said further pulley and wherein the belt tensioning device is arranged to apply a torque to the further pulley.
Claim 5
Dependent Claim
104 words
A web tensioning apparatus according to claim 3 wherein the belt tensioning device comprises a pneumatic piston and cylinder unit operable by air pressure controlled automatically in response to variations in web tensioning, wherein a further strap is provided, said piston being coupled to said further strap, said further strap being wrapped around the further pulley in such a manner that an increase in the pressure of fluid supplied to the cylinder produces a rotation of the further pulley and hence of the cam in such a direction as to cause the first strap to be wrapped further around the surface of the cam.
Claim 6
Dependent Claim
80 words
A web tensioning apparatus according to claim 1 wherein the compensating means comprises a gear wheel and a rack, said gear wheel being movable along said rack under the control of the tensioning device, the movable pulley being eccentrically supported by the gear wheel so that the distance between the axis of rotation of the pulley and the pitch line of the rack decreases as the gear wheel is moved in the direction which increases the tension in the belt.
Claim 7
Dependent Claim
102 words
A web tensioning apparatus according to claim 1 wherein the compensating means comprises a pair of coaxial gear wheels and cooperating parallel racks, said gear wheels being movable along said racks, the belt tensioning device acting on the gear wheels to produce a movement of the latter along the racks, the movable pulley being eccentrically supported by the gear wheels in a manner such that the distance between the axis of rotation of the pulley and the plane containing the pitch line of the rack decreases as the gear wheels are moved in the direction which increases the tension in the belt.
Claim 8
Dependent Claim
122 words
A web tensioning apparatus according to claim 1 wherein the compensating means comprises an arm and a carrier member, the arm being pivotally supported by the carrier member, said carrier member being movable under the control of the tensioning device, the movable pulley being supported by the arm, and wherein the apparatus further includes cam means acting on the arm to produce a pivoting movement thereof as a carrier member is moved by the tensioning device in a manner such that a movement of the carrier member in the direction which increases the tension in the belt causes the ratio of the tension imparted to the belt, to that applied by the tensioning device to the carrier member, to be gradually increased.
References Cited (Backward Citations)
US2892597A
Cited
US2979280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |