US3580668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control mechanism for motion picture projector
Assignee: Eastman Kodak Co
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Filing: 1968-10-04
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Granted: 1971-05-25
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Expires: 1988-10-04
Abstract
Abstract A driving arrangement for the film claw of a motion picture projector comprises a plurality of radial cams which rotate in synchronism on a common axis to selectively effect various modes of up-and-down and in-and-out movement of the claw.
Inventors
- 👤 Hermann Claar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:22
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/18; G03B1/20; G03B1/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
161 words
In a motion picture projector of the tube having an aperture film gate past which film is adapted to advance for projection of successive images, the combination comprising: a. a rotatable shaft defining a first axis which is substantially perpendicular to the direction of film advance; b. a plurality of in-out radial film engaging cams, mounted on said shaft, each said in-out radial cam corresponding to a different mode of operation of the projector; c. an up-and-down cam mounted on said shaft; d. claw means for engaging and advancing the film and defining a second axis substantially parallel to the direction of film advance; e. means coupling said up-and-down radial cam to said claw means to move said claw means linearly relative to said second axis; and f. means for selectively coupling one of said in-out cams to said claw means to effect in-out movement of said claw means according to a mode of operation corresponding to said selected in-out cam.
Claim 2
Dependent Claim
161 words
In a motion picture projector of the tube having an aperture film gate past which film is adapted to advance for projection of successive images, the combination comprising: a. a rotatable shaft defining a first axis which is substantially perpendicular to the direction of film advance; b. a plurality of in-out radial film engaging cams, mounted on said shaft, each said in-out radial cam corresponding to a different mode of operation of the projector; c. an up-and-down cam mounted on said shaft; d. claw means for engaging and advancing the film and defining a second axis substantially parallel to the direction of film advance; e. means coupling said up-and-down radial cam to said claw means to move said claw means linearly relative to said second axis; and f. means for selectively coupling one of said in-out cams to said claw means to effect in-out movement of said claw means according to a mode of operation corresponding to said selected in-out cam.
Claim 3
Dependent Claim
86 words
The invention as set forth in claim 1 wherein said plurality of in-out cams comprises a first cam shaped to operate in synchronism with said up-down cam to effect reverse movement of film past the film gate, a second cam shaped to operate in synchronism with said up-down cam to effect forward movement of the film past the film gate, and a third cam interposed between said first and second cams on said shaft and shaped to prevent movement of the film past the film gate.
Claim 4
Dependent Claim
54 words
The invention as set forth in claim 2 including a plurality of rolling elements located on said second axis, and spring means urging said claw means against said rolling elEments; said claw means being adapted to execute in-out movement by pivoting about said rolling elements and execute up-down linear movement along said second axis.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |