US4297019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic film feeding apparatus for photographic camera
Assignee: Konica Minolta Inc
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Filing: 1979-08-14
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Granted: 1981-10-27
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Expires: 1999-08-14
Abstract
Abstract An automatic film feeding apparatus for a camera includes a first switch operable in response to the opened or closed position of the camera rear cover, a second switch operable in response to the position of a film counter, a third switch operable in accordance with the position of a film strip in a camera, and an electronic control circuit for operating a film winding motor drive mechanism in response to predetermined states of the first, second, and third switches.
Inventors
- 👤 Michio Yagi
- 👤 Kunio Nakajima
- 👤 Yasutsugu Nakagawa
- 👤 Sizuo Ishii
- 👤 Kazuhisa Aratame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:37
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
369 words
An automatic film feeding apparatus for a photographic camera which utilizes a film strip and which includes a motor drive mechanism for winding the film strip to photographic exposure enabling frame positions therealong, a counter operable for indicating the frame positions of the film strip, and a rear cover of the camera movable between an open position for film loading and removal and a closed position for photographic exposure of the film, said film feeding apparatus comprising: a first switch operable in response to the position of the rear cover of the camera and switchable between a first state when the rear cover is closed and a second state when the rear cover is open; a second switch operable in response to the position of the film counter and switchable between a first state until the counter indicates movement of the film strip to a first photographic exposure frame position and a second state when the counter indicates movement of the film strip to at least said first exposure frame position; a third switch operable in accordance with the position of the film strip and switchable between a first state when the film strip is at a photographic exposure frame position and a second state when the film strip is remote from an exposure frame position; and electronic control circuit means for operating the motor drive mechanism in response to the states of said first, second and third switches, said circuit means being adapted to operate the motor drive mechanism when said first and second switches are switched to said first states thereof and independently of the state of said third switch so as to automatically wind and feed the film strip substantially to said first photographic exposure frame on loading of the film strip into the camera and movement of the rear cover to its closed position, and said control circuit being further adapted to operate the motor drive mechanism when said first switch is in its first state and said third switch is in its second state and independently of the state of said second switch so as to wind the film strip to the next exposure frame position after photographic exposure at the preceding frame position.
Claim 2
Dependent Claim
369 words
An automatic film feeding apparatus for a photographic camera which utilizes a film strip and which includes a motor drive mechanism for winding the film strip to photographic exposure enabling frame positions therealong, a counter operable for indicating the frame positions of the film strip, and a rear cover of the camera movable between an open position for film loading and removal and a closed position for photographic exposure of the film, said film feeding apparatus comprising: a first switch operable in response to the position of the rear cover of the camera and switchable between a first state when the rear cover is closed and a second state when the rear cover is open; a second switch operable in response to the position of the film counter and switchable between a first state until the counter indicates movement of the film strip to a first photographic exposure frame position and a second state when the counter indicates movement of the film strip to at least said first exposure frame position; a third switch operable in accordance with the position of the film strip and switchable between a first state when the film strip is at a photographic exposure frame position and a second state when the film strip is remote from an exposure frame position; and electronic control circuit means for operating the motor drive mechanism in response to the states of said first, second and third switches, said circuit means being adapted to operate the motor drive mechanism when said first and second switches are switched to said first states thereof and independently of the state of said third switch so as to automatically wind and feed the film strip substantially to said first photographic exposure frame on loading of the film strip into the camera and movement of the rear cover to its closed position, and said control circuit being further adapted to operate the motor drive mechanism when said first switch is in its first state and said third switch is in its second state and independently of the state of said second switch so as to wind the film strip to the next exposure frame position after photographic exposure at the preceding frame position.
Claim 3
Dependent Claim
133 words
An automatic film feeding apparatus according to claim 1 wherein the photographic camera includes a sprocket releasing member operable to enable rewinding of the film strip, said apparatus further comprising a fourth switch actuatable by the sprocket releasing member and switchable from a normal first state to a second state when the releasing member is operated, said control circuit means being further responsive to said fourth switch such that switching of the fourth switch to said second state thereof for enabling rewinding of the film strip disables the operation of the motor drive mechanism normally resulting from the switching of said first and second switches to their first states, whereby winding of the film strip to a next exposure frame by the motor drive mechanism is prevented during rewinding of the film strip.
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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |