US3780959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supply and take-up system for film and the like
Assignee: Individual
•
Filing: 1971-11-03
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Granted: 1973-12-25
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Expires: 1991-11-03
Abstract
Abstract A pair of coaxial horizontal disks, driven by respective motors, respectively support a supply coil and a take-up coil of a film strip passing through a projector on its way from the first to the second disk. A central cutout in the first disk accommodates the pivot of a lever whose free end has a bifurcation engaging a portion of the unwinding film strip formed into a loop by a pair of rollers disposed in the cutout downstream of that bifurcation. If the loop tightens or expands because of insufficient or excessive relative unreeling speed, the lever is deflected in one direction or the other to actuate one of two sensitive switches in a manner modifying the speed ratio of the two motors to restore the normal shape of the loop whereby the lever returns to a centered position.
Inventors
- 👤 W Burth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:07
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
259 words
An apparatus for continuously controlling the supply and take-up of a flexible strip, comprising: a support; a pair of generally horizontal coil-carrying disks rotatably mounted on said support; first and second drive means respectively coupled with said disks for rotating same; a pay-out device nonrotatably carried on said support in a central cutout of one of said disks adapted to have mounted thereon a supply coil of a strip to be unwound, said device including guide means for forming said strip into a substantially horizontal loop adjacent a face of said one of said disks and for directing said strip generally toward the other of said disks by way of a utilization device; wind-up means on said other of said disks for coiling up the strip leaving said utilization device; a lever; pivot means in said cutout mounting said lever on said support adjacent said guide means in a normal position with freedom of swinging in two directions from said normal position about an axis perpendicular to said face, said lever having a free end provided with strip-engaging means entrainable in either of said directions by a portion of said loop upstream of said guide means subject to dislocation upon a deformation of said loop indicative of an abnormal rate of rotation of either of said disks; and monitoring means positioned on said support for actuation by said lever, in response to a deviation thereof from said normal position, for modifying the operating speed of one of said drive means in a sense tending to restore said normal position.
Claim 2
Independent Claim
259 words
An apparatus for continuously controlling the supply and take-up of a flexible strip, comprising: a support; a pair of generally horizontal coil-carrying disks rotatably mounted on said support; first and second drive means respectively coupled with said disks for rotating same; a pay-out device nonrotatably carried on said support in a central cutout of one of said disks adapted to have mounted thereon a supply coil of a strip to be unwound, said device including guide means for forming said strip into a substantially horizontal loop adjacent a face of said one of said disks and for directing said strip generally toward the other of said disks by way of a utilization device; wind-up means on said other of said disks for coiling up the strip leaving said utilization device; a lever; pivot means in said cutout mounting said lever on said support adjacent said guide means in a normal position with freedom of swinging in two directions from said normal position about an axis perpendicular to said face, said lever having a free end provided with strip-engaging means entrainable in either of said directions by a portion of said loop upstream of said guide means subject to dislocation upon a deformation of said loop indicative of an abnormal rate of rotation of either of said disks; and monitoring means positioned on said support for actuation by said lever, in response to a deviation thereof from said normal position, for modifying the operating speed of one of said drive means in a sense tending to restore said normal position.
Claim 3
Dependent Claim
20 words
An apparatus as defined in claim 1 wherein said monitoring means comprises a pair of switches positioned in said cutout.
Claim 4
Dependent Claim
16 words
An apparatus as defined in claim 1 wherein said disks are coaxially mounted on said support.
Claim 5
Dependent Claim
36 words
An apparatus as defined in claim 1 wherein said guide means comprises a plurality of idler rollers forming said loop and an inclined roller for guiding said strip upwardly from the interior of said supply coil.
Claim 6
Dependent Claim
20 words
An apparatus defined in claim 1 wherein said strip-engaging means comprises a pair of pins positioned to straddle said strip.
Claim 7
Dependent Claim
21 words
An apparatus as defined in claim 5 wherein said lever overlies said face and said pins extend downwardly from said lever.
Claim 8
Dependent Claim
55 words
An apparatus as defined in claim 5 wherein said pins extend upwardly from said lever and define a gap at the upper ends of said pins through which said strip can be threaded, said device further comprising latch means at said gap for closing same to prevent escape of the strips from between said pins.
Claim 9
Dependent Claim
24 words
An apparatus as defined in claim 5 wherein said pins are provided with enlargements at their opposite ends adapted to confine said strip therebetween.
Claim 10
Dependent Claim
47 words
An apparatus as defined in claim 1 wherein said lever is provided with an appendage for separating each turn of the strip drawn from the inner periphery of said supply coiL from any adherent adjoining turn and for removing static electric charges from the turns separated thereby.
Claim 11
Dependent Claim
24 words
An apparatus as defined in claim 4 wherein at least one of said idler rollers is provided with an outwardly extending strip-supporting peripheral flange.
Claim 12
Independent Claim
285 words
An apparatus for continuously controlling the supply and take-up of a flexible strip, comprising: a support; a pair of parallel coil-carrying disks rotatably mounted on said support; first and second drive means respectively coupled with said disks for rotating same; a pay-out device nonrotatably carried on said support in a central cutout of one of said disks adapted to have mounted thereon a supply coil of a strip to be unwound, said device including guide means for forming said strip into a loop parallel to and adjacent a face of said one of said disks and for directing said strip generally toward the other of said disks by way of a utilization device; a lever; pivot means mounting said lever at one end on said support in a normal position within said cutout with freedom of swinging in two directions from said normal position about an axis perpendicular to said face, said guide means including a pair of closely spaced rollers in said cutout adjacent said pivot means, the other end of said lever pointing away from said rollers and being shaped for two-way positive engagement with said strip at a portion of said loop upstream of said rollers for deflecting said lever in either of said directions upon a deformation of said loop indicative of an abnormal rate of rotation of either of said disks; monitoring means positioned on said support for actuation by said lever, in response to a deflection thereof from said normal position, for modifying the operating speed of one of said drive means in a sense tending to restore said normal position; and wind-up means on said other of said disks for coiling up the strip leaving said utilization device.
Claim 13
Independent Claim
285 words
An apparatus for continuously controlling the supply and take-up of a flexible strip, comprising: a support; a pair of parallel coil-carrying disks rotatably mounted on said support; first and second drive means respectively coupled with said disks for rotating same; a pay-out device nonrotatably carried on said support in a central cutout of one of said disks adapted to have mounted thereon a supply coil of a strip to be unwound, said device including guide means for forming said strip into a loop parallel to and adjacent a face of said one of said disks and for directing said strip generally toward the other of said disks by way of a utilization device; a lever; pivot means mounting said lever at one end on said support in a normal position within said cutout with freedom of swinging in two directions from said normal position about an axis perpendicular to said face, said guide means including a pair of closely spaced rollers in said cutout adjacent said pivot means, the other end of said lever pointing away from said rollers and being shaped for two-way positive engagement with said strip at a portion of said loop upstream of said rollers for deflecting said lever in either of said directions upon a deformation of said loop indicative of an abnormal rate of rotation of either of said disks; monitoring means positioned on said support for actuation by said lever, in response to a deflection thereof from said normal position, for modifying the operating speed of one of said drive means in a sense tending to restore said normal position; and wind-up means on said other of said disks for coiling up the strip leaving said utilization device.
Claim 14
Dependent Claim
25 words
An apparatus as defined in claim 11 wherein said other end of said lever is provided with a transverse bifurcation adapted to straddle said strip.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |