Patent US3762291A successfully refreshed from Google Patents.
US3762291A
Expired / Lapsed
US
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Film motor drive system
Assignee: Nikon Corp
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Filing: 1972-06-01
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Granted: 1973-10-02
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Expires: 1992-06-01
Abstract
Abstract A film motor drive system includes a motor provided in a motor drive portion and a second motor provided in a long-film magazine portion. An electric circuit is provided so that the motor in the long-film magazine portion alone is energized when a camera''s sprocket is made free to rotate by upward movement of a camera''s rewind button during film loading or at the end of photo-taking operation. Thus, the forward and rearward leaders of the film may be taken up before and after the photo-taking operation. The motor drive system may further include forward counter means and/or reverse counter means connected with a switch inserted in the electric circuit.
Inventors
- 👤 S Kimura
- 👤 K Daitoku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:05
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
222 words
In a camera with a motor drive system including at least a first electric motor (M1); a sprocket (1) for transporting film; drive means (11, 12, 13, 14, 15, 16 and 17) operatively connected with the sprocket and a shutter mechanism, to rotate the sprocket and cock the shutter upon rotation of the motor (M1); a second electric motor (M2) operatively associated with the drive means to rotate while the drive means rotates the sprocket, to thereby wind up the transported film; and a rewinding button for disconnecting the sprocket from the drive means to permit of free rotation of the sprocket; the improvement comprising: a circuit for the second electric motor (M2); a first electric switch (S6) provided in the circuit and associated with said rewinding button to close when the rewinding button disconnects the sprocket from the drive means; a normally open second electric switch (S5) provided in the circuit manually operable to close; first means for controlling the circuit to wind up a predetermined length of forward film-leader prior to phototaking when the film is loaded in the camera, and the first and second switches are closed; and second means for controlling the circuit to wind up a predetermined length of rearward film-leader when a predetermined length of film is phOtographed, and the first and second switches are closed.
Claim 2
Dependent Claim
222 words
In a camera with a motor drive system including at least a first electric motor (M1); a sprocket (1) for transporting film; drive means (11, 12, 13, 14, 15, 16 and 17) operatively connected with the sprocket and a shutter mechanism, to rotate the sprocket and cock the shutter upon rotation of the motor (M1); a second electric motor (M2) operatively associated with the drive means to rotate while the drive means rotates the sprocket, to thereby wind up the transported film; and a rewinding button for disconnecting the sprocket from the drive means to permit of free rotation of the sprocket; the improvement comprising: a circuit for the second electric motor (M2); a first electric switch (S6) provided in the circuit and associated with said rewinding button to close when the rewinding button disconnects the sprocket from the drive means; a normally open second electric switch (S5) provided in the circuit manually operable to close; first means for controlling the circuit to wind up a predetermined length of forward film-leader prior to phototaking when the film is loaded in the camera, and the first and second switches are closed; and second means for controlling the circuit to wind up a predetermined length of rearward film-leader when a predetermined length of film is phOtographed, and the first and second switches are closed.
Claim 3
Dependent Claim
82 words
A camera according to claim 1, wherein said first means includes a forward counter (35) which automatically returns to its start position when the film is loaded in the camera and a third switch (S8) provided in the circuit, operatively associated with said forward counter in such a manner that said forward counter closes the third switch (S8) at the start position thereof and opens the third switch when the forward counter is rotated by a predetermined angle from its start position.
Claim 4
Dependent Claim
91 words
A camera according to claim 1, wherein said second means includes a rearward counter (37) which is positioned at its zero position upon completion of a predetermined phototaking operation and a fourth switch (S7) provided in the circuit, operatively associated with said rearward counter in such a manner that the rearward counter closes the fourth switch (S7) at the zero position thereof to energize said second motor to take-up said rearward leader, and opens the fourth switch when the rearward counter is rotated by a predetermined angle from its zero position.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |