US3893142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor driven automatic film advance
Assignee: Pentax Corp
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Filing: 1973-07-17
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Granted: 1975-07-01
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Expires: 1993-07-17
Abstract
Abstract A camera includes an electric motor driven mechanism for advancing the film and charging and releasing the shutter and is provided with a switch actuator which is motivated by the stopping of the film take-up, a shutter release which is locked and is unlocked upon a film frame release and a shutter release actuator motivated by the motor following the advance of a film frame. The motor, a battery, an interlock switch, and a manual switch are connected in series between the arm of a changeover switch and one of its contacts, the other contact being connected to the junction of the interlock switch and manual switch. The interlock switch is closed when the shutter release actuator is retracted or when it is fully advanced and the shutter release member is unlocked and is otherwise open. A similar mechanism with the interlock switch in an opposite phase controls the energization of a signal lamp. The switch arm is in engagement with the second contact during the film advance.
Inventors
- 👤 Akihiro Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:27
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
An automatic stopping mechanism in a camera of electrical automatic film transport type comprising: a. means including a drive motor for advancing a film a unit frame, and charging the camera shutter; b. a shutter release actuator member movable between advanced and retracted positions and urged to its advanced position by said drive motor following full film frame advance or completion of a film; c. means including a shutter release locking mechanism for stopping said shutter release actuator member at aN intermediate position between said retracted and advanced positions; d. a current source for said drive motor; and e. a control circuit including a switching mechanism mounted in said control circuit including said drive motor and current source at least during the time when the film frame is advanced or the shutter is charged, said switching mechanism by contact with said shutter release actuator member being in a closed position whereby said motor is energized when said shutter release actuator member is either in said advanced or in said retracted position and in an open position when the shutter release actuator member is in an intermediate stop position whereby said motor is deenergized and stops automatically.
Claim 2
Dependent Claim
196 words
An automatic stopping mechanism in a camera of electrical automatic film transport type comprising: a. means including a drive motor for advancing a film a unit frame, and charging the camera shutter; b. a shutter release actuator member movable between advanced and retracted positions and urged to its advanced position by said drive motor following full film frame advance or completion of a film; c. means including a shutter release locking mechanism for stopping said shutter release actuator member at aN intermediate position between said retracted and advanced positions; d. a current source for said drive motor; and e. a control circuit including a switching mechanism mounted in said control circuit including said drive motor and current source at least during the time when the film frame is advanced or the shutter is charged, said switching mechanism by contact with said shutter release actuator member being in a closed position whereby said motor is energized when said shutter release actuator member is either in said advanced or in said retracted position and in an open position when the shutter release actuator member is in an intermediate stop position whereby said motor is deenergized and stops automatically.
Claim 3
Dependent Claim
120 words
An automatic stopping device of claim 1 wherein said shutter release actuator member comprises: a. a pair of slide elements and a spring element entrapped between the slide elements and movable from their respective retracted positions to their respective advanced positions in response to shutter release operation; b. a lever swingable from its retracted position to its advanced position in response to the movement of said elements. c. a reciprocating slide rod movable in response to the swinging movement of said lever; d. a release pin disposed in the range of movement of said slide rod, said shutter release locking mechanism locking said pin only when the film frame cannot be advanced thereby stopping said rod in an intermediate position.
Claim 4
Dependent Claim
24 words
An automatic stopping mechanism of claim 2 wherein said spring absorbs movement of said element when said rod is stopped in the intermediate position.
Claim 5
Dependent Claim
77 words
An automatic stopping mechanism of claim 2 wherein said switching mechanism comprises normally open pair of switches inserted in said control circuit in parallel with each other, one of said switches being closed by said lever when the latter is in its retracted position, the other of said switches being closed by said lever when the latter is in its advanced position, both switches being in an open position when the lever is in the intermediate position.
Claim 6
Dependent Claim
74 words
An automatic stopping mechanism of claim 2 wherein said switching mechanism comprises a switch, said lever has at one end a two-forked swingable tip portion, between which said switch is so disposed so that the switch is in a closed position abutting against either of the swingable tips of the lever when the lever is in the advanced or retracted position and in an open position with the lever in the intermediate stop position.
Claim 7
Dependent Claim
53 words
An automatic stopping mechanism of claim 2 wherein there is further provided a warning circuit having an alarm such as a lamp, a current source and a switch, said switch being normally open and being closed by the lever with the latter stopped in the intermediate position so as to give a warning.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |