US3722809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endless band winding apparatus
Assignee: Robert Bosch Photokino GmbH
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Filing: 1971-09-20
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Granted: 1973-03-27
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Expires: 1991-09-20
Abstract
Abstract Apparatus for simultaneous convoluting and unwinding of endless motion picture film the major part of which is convoluted to form a roll and an unconvoluted part of which is transported step-bystep through a motion picture projector has two sets of alternating driving rollers which extend radially of and support the roll of convoluted film from below so that the axis of the roll is vertical. The rollers of one set support the outer annular section of the roll and are inclined downwardly toward the axis of the roll. The rollers of the other set support the inner annular section of the roll and are inclined outwardly and downwardly away from the axis of the roll. Each set of rollers is driven by a separate variable-speed electric motor through the intermediary of a horizontal turntable in such direction that the outer section of the roll collects and the inner section of the roll pays out the film. The speed of the motor which drives the one set of rollers is adjustable by a first detector which detects the changes in tension of that portion of the film which is being convoluted on the outer section, and the speed of the motor which drives the other set of rollers is adjustable by a second detector which detects the changes in tension of that portion of the film which is being withdrawn from the inner section of the roll. At least one of the turntables is movable between several levels to thereby change the inclination of the respective set of rollers and to thus enable the apparatus to support and rotate rolls of different outer diameters.
Inventors
- 👤 H Leisring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:47
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
185 words
In an apparatus for simultaneous convoluting and unwinding of an endless flexible band a substantial length of which forms a roll having a plurality of convolutions including an innermost and an outermost convolution, a first portion of which is integral with said innermost convolution and a second portion of which is integral with said outermost convolution as well as with said first band portion; a combination comprising two groups of driving rollers arranged to extend substantially radially of and to support said roll from below; mounting means rotatably supporting said driving rollers in such positions that the rollers of one of said groups support a first annular section of the roll which includes said innermost convolution and the rollers of the other of said groups support a second annular section of the roll which includes said outermost convolution; and first and second variable-speed drive means for respectively rotating said first and second groups of rollers independently of each other whereby the rollers rotate said roll in a predetermined direction with attendant withdrawal of one of said band portions and convoluting of the other band portion.
Claim 2
Dependent Claim
185 words
In an apparatus for simultaneous convoluting and unwinding of an endless flexible band a substantial length of which forms a roll having a plurality of convolutions including an innermost and an outermost convolution, a first portion of which is integral with said innermost convolution and a second portion of which is integral with said outermost convolution as well as with said first band portion; a combination comprising two groups of driving rollers arranged to extend substantially radially of and to support said roll from below; mounting means rotatably supporting said driving rollers in such positions that the rollers of one of said groups support a first annular section of the roll which includes said innermost convolution and the rollers of the other of said groups support a second annular section of the roll which includes said outermost convolution; and first and second variable-speed drive means for respectively rotating said first and second groups of rollers independently of each other whereby the rollers rotate said roll in a predetermined direction with attendant withdrawal of one of said band portions and convoluting of the other band portion.
Claim 3
Dependent Claim
85 words
A combination as defined in claim 1, wherein the tension of said first and second band portions varies in the course of rotation of said driving rollers, and further comprising first and second adjusting means each associated with a different one of said drive means, said first and second adjusting means being arranged to change the speed of the associated drive means in response to changes in tension of the first and second band portions of that band whose roll is supported by said rollers.
Claim 4
Dependent Claim
49 words
A combination as defined in claim 1, wherein the band is a photographic film and wherein successive increments of one of said band portions enter into and successive increments of the other band portion leave a cinematographic apparatus in response to rotation of the roll in said predetermined direction.
Claim 5
Dependent Claim
28 words
A combination as defined in claim 1, wherein the axes of rollers of said other group are inclined downwardly toward the axis of the roll on said rollers.
Claim 6
Dependent Claim
29 words
A combination as defined in claim 1, wherein the axes of rollers of said one group are inclined downwardly away from the axis of the roll on said rollers.
Claim 7
Dependent Claim
45 words
A combination as defined in claim 1, wherein each of said drive means comprises a substantially horizontal turntable and means for rotating the respective turntable at a plurality of speeds, each of said rollers having a portion in torque-receiving frictional engagement with the respective turntable.
Claim 8
Dependent Claim
31 words
A combination as defined in claim 6, wherein said turntables are coaxial with the roll which is supported by said rollers and the means for rotating said turntables comprise variable-speed motors.
Claim 9
Dependent Claim
22 words
A combination as defined in claim 6, wherein the diameter of one of said turntables exceeds the diameter of the other turntable.
Claim 10
Dependent Claim
15 words
A combination as defined in claim 6, wherein said turntables are mounted at different levels.
Claim 11
Dependent Claim
64 words
A combination as defined in claim 1, wherein the driving rollers of at least one of said groups are inclined with reference to the axis of the roll thereon so that the first axial end of each inclined roller is located at a level above the second axial end thereof, and further comprising means for changing the inclination of said last-mentioned group of rollers.
Claim 12
Dependent Claim
62 words
A combination as defined in claim 10, wherein the drive means for said inclined driving rollers comprises a rotary turntable and each of said inclined rollers comprises a portion at one of said axial ends which is in frictional torque-receiving engagement with said turntable, said means for changing the inclination comprising means for moving said turntable between a plurality of different levels.
Claim 13
Dependent Claim
47 words
A combination as defined in claim 1, wherein the driving rollers of one of said groups alternate with the driving rollers of the other group, as considered in the circumferential direction of the roll thereon, each of said groups comprising at least three substantially equidistant driving rollers.
Claim 14
Dependent Claim
121 words
A combination as defined in claim 1, wherein the roll on said rollers is arranged to rotate in a direction to pay out the first band portion and to collect the second band portion, and further comprising adjusting means for changing the speed of at least one of said drive means, said one drive means comprising a variable-speed electric motor and said adjusting means comprising adjustable potentiometer means in circuit with said motor means and detector means arranged to detect changes in the tension of one of the band portion and to thereby adjust said potentiometer means whereby said potentiometer means changes the speed of said motor means as a function of changes in the tension of the last-mentioned band portion.
Claim 15
Dependent Claim
22 words
A combination as defined in claim 1, further comprising rotary guide means for the innermost convolution of the roll on said rollers.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |