US3638547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film winding apparatus in camera with interchangeable film back
Assignee: Minolta Co Ltd
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Filing: 1969-08-04
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Granted: 1972-02-01
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Expires: 1989-08-04
Abstract
Abstract A film winding apparatus comprises a reciprocal rotation member in a film back which is rotated interrelatedly with a winding knob in a camera body, a ratchet wheel to drive a film winding spool in the film back, a clutch pawl provided on the rotation member and another ratchet wheel which causes the clutch pawl to engage with or disengaged from the ratchet wheel for film winding. With the use of this apparatus the film back can be mounted on the camera body irrespective of the state of shutter and film before or after effecting exposure. The apparatus also includes means for making multiple exposures.
Inventors
- 👤 Minoru Sekida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:20
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
257 words
In a photographic camera including a main body and a removable film magazine, the main body comprising: a shutter charge means and a first transmission mechanically connected to said shutter charge means; the film magazine comprising: a manually operated film winding member; a second transmission; a film spool driving member interconnected with said winding member through said second transmission; a ratchet member mechanically connected to said film spool driving member; an intermediate member engageable with said first transmission with the charging operation of said shutter charge means and biased to return to a retracted position when disengaged from said first transmission; a pawl member pivotally mounted on said intermediate member and biased to engage with said ratchet member and prevent the latter from moving relative to said intermediate member in a direction reverse to that for film winding-up; a control member mounted on said intermediate member so that one of them is independently movable relative to the other when said other is stopped and both are movable together when they are respectively free; a latch memBer positioned to engage with said control member and prevent the latter from moving in a film winding-up direction when a film has been wound up; said control member disengaging said pawl member from said ratchet member when relative displacement occurs between said control member and said intermediate member and the amount of the relative displacement being not less than that of the movement of said intermediate member; and means for restoring the relationship between said control member and said intermediate member.
Claim 2
Dependent Claim
257 words
In a photographic camera including a main body and a removable film magazine, the main body comprising: a shutter charge means and a first transmission mechanically connected to said shutter charge means; the film magazine comprising: a manually operated film winding member; a second transmission; a film spool driving member interconnected with said winding member through said second transmission; a ratchet member mechanically connected to said film spool driving member; an intermediate member engageable with said first transmission with the charging operation of said shutter charge means and biased to return to a retracted position when disengaged from said first transmission; a pawl member pivotally mounted on said intermediate member and biased to engage with said ratchet member and prevent the latter from moving relative to said intermediate member in a direction reverse to that for film winding-up; a control member mounted on said intermediate member so that one of them is independently movable relative to the other when said other is stopped and both are movable together when they are respectively free; a latch memBer positioned to engage with said control member and prevent the latter from moving in a film winding-up direction when a film has been wound up; said control member disengaging said pawl member from said ratchet member when relative displacement occurs between said control member and said intermediate member and the amount of the relative displacement being not less than that of the movement of said intermediate member; and means for restoring the relationship between said control member and said intermediate member.
Claim 3
Dependent Claim
32 words
The mechanism as set forth in claim 1, wherein said film magazine comprises means including a second latch member for stopping the manually operated member when the film has been wound up.
Claim 4
Dependent Claim
26 words
The mechanism as set forth in claim 1, wherein said second transmission includes means for transmitting the movement of said second transmission only in one direction.
Claim 5
Dependent Claim
57 words
The mechanism as set forth in claim 1, wherein said first transmission includes a gear having a toothless portion; and said intermediate member includes a circular plate having a gear portion on the circumference thereof which registers with said partially toothless gear, and is disengaged from said partially toothless gear when in registry with said toothless portion.
Claim 6
Dependent Claim
97 words
The mechanism as set forth in claim 1, wherein said control member consists of an annular member having a ratchet on its circumference and an inner surface with a recess portion with which a portion of said pawl member is in slidable contact while said intermediate member and said control member are in normal relationship so that said pawl member may engage said ratchet member, said portion of said pawl member being in contact with another portion of said inner surface when said displacement occurs so that said pawl member may be disengaged from the ratchet member.
Claim 7
Dependent Claim
58 words
The mechanism as set forth in claim 1, wherein the main body comprises a sensing member projectable into the interior of the film magazine in response to shutter releasing operation; and said film magazine comprises a member responsive to the position of the advance of the film for preventing said sensing member from projecting into the film magazine.
Claim 8
Dependent Claim
51 words
The mechanism as set forth in claim 6, wherein the film magazine comprises a second latch member for stopping said manually operated member, and an operating member which operates on said latch members and said preventing member to move them into their stopping position when the film has been wound up.
Claim 9
Dependent Claim
52 words
The mechanism as set forth in claim 7, wherein said film magazine comprises a two-armed lever, a first arm of which confronts said sensing member and is movable by said operating member, a second arm of which urging said operating member to its rest position with the movement of said first arm.
Claim 10
Dependent Claim
36 words
The mechanism as set forth in claim 1, wherein said film magazine comprises manually operable means for effecting multiple exposure operable with said control member to permit displacement between said control member and said intermediate member.
Claim 11
Dependent Claim
109 words
The mechanism as set forth in claim 9, wherein the main body further comprises a sensing member projectable into the interior of said film magazine in response to shutter releasing operation; the film magazine further comprises a member for preventing the sensing member from projecting into the film magazine while the film is unwound, the multiple exposure effecting means including a manually slidable member biased towards its rest position, a pawl engageable with said control member to move the latter independently when said slidable member is manually moved against the bias, and an actuator member movable by said slidable member to retract said preventing member from its preventing 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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |