US3669376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling application of braking force to a roll of sheet material
Assignee: TECH OFF
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Filing: 1970-08-10
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Granted: 1972-06-13
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Expires: 1990-08-10
Abstract
Abstract A system for controlling the application of braking force to a roll of sheet material in which a sensing member controlled by the diameter of the unwinding roll, moves a cam surface to actuate a control device that in turn controls the energization of a brake for such roll, the cam surface being adjustable to provide a braking force that may be varied from zero to a predetermined amount between the extreme ranges of the maximum and minimum roll diameters.
Inventors
- 👤 Raymond L R Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:25
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/06; B65H23/063
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
216 words
A system for controlling the application of a braking force to a roll of sheet material mounted on a shaft with which a brake coacts, said system comprising a control shaft, a sensing device to effect angular displacement of said control shaft about its axis by an amount proportional to the decrease in diameter of said roll as the sheet material is withdrawn therefrom, a movable member controlling said brake to determine the actuation of said brake based on the displacement of said movable member, a plate secured to said control shaft and extending radially therefrom, a cam member comprising a strip having an arcuate outer cam surface engaged by said movable member, said strip being pivoted at one end to said plate on an axis extending at right angles to said plate and having its other end resting on a support secured to said plate and extending at right angles thereto, and means to adjust the distance between the pivoted end of said arcuate strip and the supported end of said arcuate strip from the axis of said control shaft, whereby the position of said cam member may be adjusted with respect to said control shaft to set the force exerted by said brake on said roll shaft as the diameter of said roll increases.
Claim 2
Independent Claim
216 words
A system for controlling the application of a braking force to a roll of sheet material mounted on a shaft with which a brake coacts, said system comprising a control shaft, a sensing device to effect angular displacement of said control shaft about its axis by an amount proportional to the decrease in diameter of said roll as the sheet material is withdrawn therefrom, a movable member controlling said brake to determine the actuation of said brake based on the displacement of said movable member, a plate secured to said control shaft and extending radially therefrom, a cam member comprising a strip having an arcuate outer cam surface engaged by said movable member, said strip being pivoted at one end to said plate on an axis extending at right angles to said plate and having its other end resting on a support secured to said plate and extending at right angles thereto, and means to adjust the distance between the pivoted end of said arcuate strip and the supported end of said arcuate strip from the axis of said control shaft, whereby the position of said cam member may be adjusted with respect to said control shaft to set the force exerted by said brake on said roll shaft as the diameter of said roll increases.
Claim 3
Dependent Claim
53 words
The system set forth in claim 1 in which said sensing device comprises a control arm affixed at one end with respect to said control shaft and extending at right angles with respect thereto, the free end of said control arm mounting a roller adapted to ride on the periphery of such roll.
Claim 4
Dependent Claim
30 words
The system set forth in claim 1 in which resilient means is provided normally urging said control shaft in direction to retain said roller against the periphery of such roll.
Claim 5
Dependent Claim
27 words
The system set forth in claim 1 in which the axis of said control shaft and the axis of said roll lie in the same vertical plane.
Claim 6
Dependent Claim
65 words
The system set forth in claim 1 in which a first adjustment sleeve is eccentrically mounted on the axis of said strip, said strip having an opening through which said sleeve extends to define the pivotal mount for said strip whereby upon rotation of said sleeve, the pivoted end of said strip may be moved toward and away from the axis of said control shaft.
Claim 7
Dependent Claim
58 words
The system set forth in claim 1 in which a second adjustment sleeve is provided, said sleeve being rotatably mounted on an axis extending at right angles to said plate, said sleeve having a peripheral cam surface which is eccentric with respect to its mounting axis and which defines the support for the free end of said strip.
Claim 8
Dependent Claim
114 words
The system set forth in claim 1 in which a first adjustment sleeve is eccentrically mounted on said axis, said strip having an opening through which said sleeve extends to define the pivotal mount for said strip, a second adjustment sleeve is provided, said second sleeve being rotatably mounted on an axis extending at right angles to said plate, said second sleeve having a peripheral cam Surface which is eccentric with respect to its mounting axis and which defines the support for the free end of said strip, said sleeves being adjustable to vary the position of the arcuate outer cam surface of said strip with respect to the axis of said control shaft.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |