US4497555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor-driven film winding mechanism
Assignee: Fujinon Corp
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Filing: 1982-11-26
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Granted: 1985-02-05
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Expires: 2002-11-26
Abstract
Abstract A motor-driven film winding mechanism for cameras has a driving force transmission including a clutch releasably connecting a sprocket drum to the driving force transmission. The clutch can operate to release the sprocket drum from the system in dependence on the speed of movement of the sprocket drum relative to that of the transmission so as to cause the sprocket drum to be driven by the film either when wound up or rewound. The transmission is a gear train one of whose gears drives ratchets that engage with a ratchet wheel on the sprocket drum to constitute the one-way clutch.
Inventors
- 👤 Kazuhiro Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:12
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
A motor-driven film winding mechanism for a photographic camera, comprising: a driving motor; a driving force transmission; a take-up spool driven by said driving motor through said driving force transmission for winding up a film on the spool; a sprocket drum having a plurality of sprockets on its periphery which are engageable with film perforations; and means for releasably connecting said sprocket drum to said driving force transmission in dependence on the speed of movement of said sprocket drum relative to the speed of movement of said driving force transmission, said releasably connecting means releasing from said driving force transmission said sprocket drum when the speed of movement of said sprocket drum is greater than that of said driving force transmission.
Claim 2
Dependent Claim
121 words
A motor-driven film winding mechanism for a photographic camera, comprising: a driving motor; a driving force transmission; a take-up spool driven by said driving motor through said driving force transmission for winding up a film on the spool; a sprocket drum having a plurality of sprockets on its periphery which are engageable with film perforations; and means for releasably connecting said sprocket drum to said driving force transmission in dependence on the speed of movement of said sprocket drum relative to the speed of movement of said driving force transmission, said releasably connecting means releasing from said driving force transmission said sprocket drum when the speed of movement of said sprocket drum is greater than that of said driving force transmission.
Claim 3
Dependent Claim
18 words
A motor-driven film winding arrangement as defined in claim 1, said driving force transmission being a gear train.
Claim 4
Dependent Claim
40 words
A motor-driven film winding arrangement as defined in claim 1, said sprocket drum when released from said driving force transmission being forced to rotate by the film, while restricting to one frame the length of the film to be driven.
Claim 5
Dependent Claim
38 words
A motor-driven film winding arrangement as defined in claim 1, said releasably connecting means also releasing from said driving force transmission said sprocket drum when said driving force transmission is driven in a direction to rewind the film.
Claim 6
Dependent Claim
146 words
A motor-driven film winding mechanism for a photographic camera, comprising: a driving motor; a driving force transmission gear train; a take-up spool driven by said driving motor through said driving force transmission gear train for winding up a film on the spool; a sprocket drum having a plurality of sprockets on its periphery which are engageable with film perforations; and means for releasably connecting said sprocket drum to said driving force transmission gear train in dependence on the speed of movement of said sprocket drum relative to the speed of movement of said driving force transmission gear train, said releasably connecting means being a clutch comprising a ratchet arm mounted for rotation on and with a gear of said driving force transmission gear train, and a ratchet wheel integral with said sprocket drum, said ratchet arm being engageable in one-way driving relation with said ratchet wheel.
Claim 7
Dependent Claim
146 words
A motor-driven film winding mechanism for a photographic camera, comprising: a driving motor; a driving force transmission gear train; a take-up spool driven by said driving motor through said driving force transmission gear train for winding up a film on the spool; a sprocket drum having a plurality of sprockets on its periphery which are engageable with film perforations; and means for releasably connecting said sprocket drum to said driving force transmission gear train in dependence on the speed of movement of said sprocket drum relative to the speed of movement of said driving force transmission gear train, said releasably connecting means being a clutch comprising a ratchet arm mounted for rotation on and with a gear of said driving force transmission gear train, and a ratchet wheel integral with said sprocket drum, said ratchet arm being engageable in one-way driving relation with said ratchet wheel.
References Cited (Backward Citations)
US4145011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |