Patent US3613540A successfully refreshed from Google Patents.
US3613540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film counter changeover device for different kinds of film having different frames
Assignee: Nikon Corp
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Filing: 1969-10-07
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Granted: 1971-10-19
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Expires: 1989-10-07
Abstract
Abstract A frame counter changeover and film-metering device is interconnected with a film guide changeover device to enable a camera to operate with different lengths and thickness of film. The film guide changeover device consists of two slidable pressure plates. Upon operation of an external control, the gap between the two plates is varied to accommodate different film thicknesses. The external control also adjusts the frame counter to accommodate different lengths of film.
Inventors
- 👤 Makoto Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:37
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/60; G03B1/66
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
251 words
A roll film camera in which the film strip is guided in the exposure frame in a channel formed between a film guide surface on the camera body and a film guide plate, comprising a rotatable takeup spindle for winding the film strip passing through the film guide channel, a ratchet carried by said takeup spindle, a stop pawl for locking the movement of said takeup sprinkle by engaging therewith, a film-measuring roller positioned on the camera body to be engaged with the film strip and rotated by the movement of said film strip, indexing means including a counter shaft on the camera body rotated by said roller when a predetermined length of the film has been wound, an indexing disc carried by said counter shaft and having plurality of notches on the periphery thereof, and rockable lever interconnected to said stop pawl, and biased so as to engage in timed relation with the notch of said disc, means for moving automatically said rockable lever out of engaging relation with said indexing disc, including a segment cam carried by said counter shaft, and a movable lever engageable with said rockablE lever and said segment cam when a predetermined length of the film has been wounded, and means operable to move said movable lever out of the path of the movement of said segment cam and to move said film guide plate for varying the inside width of said film guide channel selectively in conformity with the thickness of the film strip.
Claim 2
Dependent Claim
251 words
A roll film camera in which the film strip is guided in the exposure frame in a channel formed between a film guide surface on the camera body and a film guide plate, comprising a rotatable takeup spindle for winding the film strip passing through the film guide channel, a ratchet carried by said takeup spindle, a stop pawl for locking the movement of said takeup sprinkle by engaging therewith, a film-measuring roller positioned on the camera body to be engaged with the film strip and rotated by the movement of said film strip, indexing means including a counter shaft on the camera body rotated by said roller when a predetermined length of the film has been wound, an indexing disc carried by said counter shaft and having plurality of notches on the periphery thereof, and rockable lever interconnected to said stop pawl, and biased so as to engage in timed relation with the notch of said disc, means for moving automatically said rockable lever out of engaging relation with said indexing disc, including a segment cam carried by said counter shaft, and a movable lever engageable with said rockablE lever and said segment cam when a predetermined length of the film has been wounded, and means operable to move said movable lever out of the path of the movement of said segment cam and to move said film guide plate for varying the inside width of said film guide channel selectively in conformity with the thickness of the film strip.
Claim 3
Dependent Claim
44 words
A roll film camera according to claim 1 further comprising a plate mounted on the camera back cover on which said film guide plate is slidably fixed, and a control knob rotatably mounted on said camera back cover for moving said film guide plate.
Claim 4
Dependent Claim
56 words
A roll film camera according to claim 1, wherein said indexing means has an exposure indication dial rotatable with said indexing disc, and an index lever having two indices on its end moved by said operable means, thereby said two indexes indicating the number of frames of the film strip in conformity with the thickness thereof.
Claim 5
Dependent Claim
80 words
A roll film camera according to claim 1, wherein said indexing disc is composed of a pair of plates, the first plate being fixed on said counter shaft and the second plate having larger periphery than said first plate and rotatably mounted on the latter so as to follow up by a half pitch of said notches, whereby when said notches of both plates coincide with each other by the winding operation, said stop pawl is engaged to said ratchet.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |