Patent US3882516A successfully refreshed from Google Patents.
US3882516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic wind-up device to detect completion of film wind-up
Assignee: Canon Inc
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Filing: 1973-10-19
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Granted: 1975-05-06
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Expires: 1993-10-19
Abstract
Abstract An automatic wind-up device to detect completion of film wind-up of a camera, in which the transmission of driving force to a rotating member which contributes to the wind up of the film is prevented at a time of holding by variation of output of a speed detection means which is in corresponding relationship with the rotating speed of said rotating member. At the same time, the driving force is transmitted through buffer means which prevents giving the film excessive wind-up effect during the holding period until the completion of prevention of driving force transmission.
Inventors
- 👤 Mitsutoshi Ogiso
- 👤 Hiroshi Aizawa
- 👤 Tomonori Iwashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:41
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
An automatic wind-up deevice for detecting completion of film wind-up in a camera, comprising: means for winding up film to a condition of completion; means for driving said wind-up means at controlled speeds; transmission means for coupling force supplied by said driving means to said film wind-up means; means for controlling said driving means; means for sensing the speed of said driving means for rendering said driving control means inactive, said control means being rendered inactive upon the sensing of a speed resulting from completion of wind-up action; and means responsive to the completion of wind-up action for releasing said transmission from supplying driving force to said wind-up means until said driving control means becomes inactive for preventing excessive load on said film wind-up means.
Claim 2
Dependent Claim
125 words
An automatic wind-up deevice for detecting completion of film wind-up in a camera, comprising: means for winding up film to a condition of completion; means for driving said wind-up means at controlled speeds; transmission means for coupling force supplied by said driving means to said film wind-up means; means for controlling said driving means; means for sensing the speed of said driving means for rendering said driving control means inactive, said control means being rendered inactive upon the sensing of a speed resulting from completion of wind-up action; and means responsive to the completion of wind-up action for releasing said transmission from supplying driving force to said wind-up means until said driving control means becomes inactive for preventing excessive load on said film wind-up means.
Claim 3
Dependent Claim
36 words
The device of claim 1, wherein said driving means includes an electrical motor and said control means includes a switch for coupling electrical energy to said motor, said speed sensing means being coupled to said switch.
Claim 4
Dependent Claim
34 words
The device of claim 1, wherein said means for sensing speed of said driving means includes a rotatable member having elements disposed thereon responsive to centrifugal force provided by the rotation of said member.
Claim 5
Dependent Claim
75 words
The device of claim 2, wherein said switch includes an arm operating as a bearing element adapted for rotational motion, and wherein said means for sensing the speed of said driving means includes a rotatable member having elements disposed thereon responsive to centrifugal force provided by the rotation of the rotatable member, said elements of said rotatable member adapted to bear against said bearing element of said switch for controlling a condition of said switch.
Claim 6
Dependent Claim
55 words
The device of claim 1, wherein said transmission means includes an intermediate gear between a driving gear and a load gear, said load gear becoming immobile upon completion of wind-up, and said means for releasing said transmission includes means for pivoting said intermediate gear about the axis of said load gear against a compressive force.
Claim 7
Dependent Claim
56 words
The device of claim 4, including a second switch for energizing said motor, said motor remaining energized by said first switch until the speed of said rotatable member is reduced, resulting in said centrifugal force elements applying sufficiently small bearing force to said switch element to allow opening of said switch and deenergizing of said motor.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |