US3689137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film rewind device for compact cinecameras
Assignee: Nikon Corp
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Filing: 1970-11-23
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Granted: 1972-09-05
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Expires: 1990-11-23
Abstract
Abstract A film rewind device for compact cinecameras of the type using a film cartridge having no supply spool shaft operable from the exterior thereof but provided with detent means attached to a take-up core, and in which the length of film to be loosely supplied to the take-up chamber of the cartridge can be varied in proportion to the film roll diameter in the supply chamber of the cartridge by the utmost utilization of the fact that the space in each of the supply and take-up chambers varies in proportion to the length of film photographed, and the length of film to be loosely supplied into the take-up chamber can be selected as desired within a predetermined range and that length of film can be rewound exactly.
Inventors
- 👤 Iida Yozo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:36
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/18; G03B19/26; G03B21/00; G03B21/14; G03B21/32; G03B21/43
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
239 words
In a cinecamera of the type using a film cartridge equipped with anti-reversing means attached to a shaft for taking up the film, and including a driving shaft, shutter means operable by said driving shaft; driving means for normally and reversely rotating the driving shaft; means for transporting the film, associated with said driving shaft; and means for preventing the rotation of the takE-up shaft while said film transporting means is operated to loosely feed the film into a take-up chamber in the film cartridge and loosely rewind the loosely fed film into a supply chamber said cartridge; the improvement comprising means for automatically stopping the normal and the reverse rotation of the driving shaft; means for determining the maximum amount of the film which is loosely fed into the take-up chamber and then rewound into said supply chamber; said determining means being associated with the driving shaft to vary said maximum amount in accordance with the amount of film wound on the take-up shaft; first means for operating the automatic stopping means to stop the normal rotation of the driving shaft when the film is loosely fed by the maximum amount into the take-up chamber; and second means for operating said automatic stopping means to stop the reverse rotation of the driving shaft when the film is loosely rewound into the supply chamber by the same length as that of the film loosely fed into the take-up chamber.
Claim 2
Dependent Claim
239 words
In a cinecamera of the type using a film cartridge equipped with anti-reversing means attached to a shaft for taking up the film, and including a driving shaft, shutter means operable by said driving shaft; driving means for normally and reversely rotating the driving shaft; means for transporting the film, associated with said driving shaft; and means for preventing the rotation of the takE-up shaft while said film transporting means is operated to loosely feed the film into a take-up chamber in the film cartridge and loosely rewind the loosely fed film into a supply chamber said cartridge; the improvement comprising means for automatically stopping the normal and the reverse rotation of the driving shaft; means for determining the maximum amount of the film which is loosely fed into the take-up chamber and then rewound into said supply chamber; said determining means being associated with the driving shaft to vary said maximum amount in accordance with the amount of film wound on the take-up shaft; first means for operating the automatic stopping means to stop the normal rotation of the driving shaft when the film is loosely fed by the maximum amount into the take-up chamber; and second means for operating said automatic stopping means to stop the reverse rotation of the driving shaft when the film is loosely rewound into the supply chamber by the same length as that of the film loosely fed into the take-up chamber.
Claim 3
Dependent Claim
124 words
A cinecamera as defined in claim 1, wherein said determining means comprises a cam member movable in association with the driving shaft; a rack member biassed to contact with the cam member and movable between a first position and a second position; said cam member displacing the rack member from the first position to the second position thereof while the film is wound on the take-up shaft from the first extremity to the middle thereof and displacing the rack member from the second position to the first position while the film is wound on the take-up shaft from the middle to the last extremity thereof; and a detector gear meshed with the rack member and provided with an integral gear and a protrusion thereon.
Claim 4
Dependent Claim
93 words
A cinecamera as defined in claim 1, wherein said automatic stopping means comprises a pair of discs securely mounted on said driving shaft and a stop member cooperable with said stop discs, said stop member being movable among a neutral position, a first position in which one of said discs is engaged therewith to stop the normal rotation of said driving shaft and a second position in which the other disc is engaged therewith to stop the reverse rotation of said driving shaft, said stop member being biassed to the neutral position thereof.
Claim 5
Dependent Claim
157 words
A cinecamera as defined in claim 3, wherein said first operation means comprises a first counter gear rotatably mounted on said integral shaft of the detector gear; said first counter bear being associated with the driving shaft when said film transporting means is operated to loosely feed the film into the take-up chamber and loosely rewind the loosely fed film into the supply chamber, and a pin provided on the first counter gear; said first counter gear being biassed for said pin to engage said protrusion of the detector gear and positioned for said pin to engage said stop member which is in the neutral position thereof when said rack member is in the first position thereof, whereby said pin displaces the stop member from the neutral position to the first position thereof to thereby stop the normal rotation of the driving shaft when the film is loosely fed by said maximum amount into the take-up chamber.
Claim 6
Dependent Claim
166 words
A cinecamera as defined in claim 4, wherein said first counter gear further includes a prolonged hole, and said second operating means comprises a second counter gear rotatably mounted on said integral shaft; said second counter gear being associated with the driving shaft when said film transporting means is operated to loosely feed the film into the take-up chamber and loosely rewind the loosely fed film into the supply chamber, and a pin provided on the second counter gear; said second counter gear being positioned for the pin thereon to engage said stop member on the opposite side of said pin of the first counter gear through said prolonged hole, whereby said pin of the second counter gear displaCes the stop member from the neutral position to the second position thereof to thereby stop the reverse rotation of the driving shaft when the film is loosely rewound into the supply chamber by the same amount as that of the film loosely fed into the take-up chamber.
Claim 7
Dependent Claim
98 words
A cinecamera as defined in claim 1, wherein said determining means comprises a cam member movable in association with the driving shaft; and a cam follower biassed to contact with the cam member and movable between a first position and a second position: said cam member displacing the cam follower from the first position to the second position thereof while the film is wound on the take-up shaft from the first extremity to the middle thereof and from the second position to the first position while the film is wound from the middle to the last extremity thereof.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |