US4401379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film feeding device for camera
Assignee: Canon Inc
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Filing: 1982-03-16
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Granted: 1983-08-30
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Expires: 2002-03-16
Abstract
Abstract A film feeding device for a camera having a rewind fork axially movable to release the spool hub of a film cartridge from the coupling connection therewith when exchanging the exposed film cartridge, wherein a sensing member is provided for detecting either when a fresh film cartridge is inserted into and seated in a chamber within the camera housing at a prescribed position, or when the back cover of the camera is closed, whereby when either one of the two events occurs, the aforesaid rewind fork is caused to return to the engaging position with the spool hub.
Inventors
- 👤 Hideo Tamamura
- 👤 Toru Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:35
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425; G03B17/28; G03B17/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A film feeding device for a camera adapted to receive film cartridges and including a rewind fork which is moved from a first position to a second position where engagement between a spool shaft of said cartridge and the rewind fork is released, comprising: (a) holding means for holding said rewind fork in said second position; (b) sensing means responsive to both insertion of a cartridge into a cartridge chamber of said camera and closure of a back cover of said camera for releasing said rewind fork from the holding connection with said holding means; and (c) bias means urging said rewind fork towards said first position.
Claim 2
Dependent Claim
107 words
A film feeding device for a camera adapted to receive film cartridges and including a rewind fork which is moved from a first position to a second position where engagement between a spool shaft of said cartridge and the rewind fork is released, comprising: (a) holding means for holding said rewind fork in said second position; (b) sensing means responsive to both insertion of a cartridge into a cartridge chamber of said camera and closure of a back cover of said camera for releasing said rewind fork from the holding connection with said holding means; and (c) bias means urging said rewind fork towards said first position.
Claim 3
Dependent Claim
47 words
A device according to claim 1, further including: (d) transmitting means for transmitting rotative force to the rewind fork, said transmitting means being arranged to be movable in the direction of an axis of the rewind fork and to rotate as a unit with the rewind fork.
Claim 4
Dependent Claim
122 words
A film feeding device for a camera adapted to receive film cartridges and including a rewind fork which is moved from a first position to a second position where a spool shaft of said cartridge is released from engagement with said rewind fork, comprising: (a) a sensing member having a first portion for detecting insertion of a film cartridge in a cartridge chamber of said camera and a second portion for detecting closure of a back cover of said camera; (b) an engaging member arranged to disengage from said sensing member in response to detecting operation of said sensing member, said engaging member being drivenly connected to said rewind fork; and (c) bias means urging said rewind fork towards said first position.
Claim 5
Dependent Claim
122 words
A film feeding device for a camera adapted to receive film cartridges and including a rewind fork which is moved from a first position to a second position where a spool shaft of said cartridge is released from engagement with said rewind fork, comprising: (a) a sensing member having a first portion for detecting insertion of a film cartridge in a cartridge chamber of said camera and a second portion for detecting closure of a back cover of said camera; (b) an engaging member arranged to disengage from said sensing member in response to detecting operation of said sensing member, said engaging member being drivenly connected to said rewind fork; and (c) bias means urging said rewind fork towards said first position.
Claim 6
Dependent Claim
26 words
A device according to claim 3, wherein said sensing member is arranged to slide in a direction in which the cartridge is inserted into said camera.
Claim 7
Dependent Claim
22 words
A device according to claim 4, further including: (d) bias means urging the sensing member towards the back cover of the camera.
Claim 8
Dependent Claim
35 words
A device according to claim 3, wherein said first portion of said sensing member is arranged upon contact with the spool shaft of said cartridge to detect when the cartridge is seated in said camera.
Claim 9
Dependent Claim
33 words
A device according to claim 6, wherein when said second portion of said sensing member contacts the back cover of the camera, said first portion is released from contact with the spool shaft.
Claim 10
Dependent Claim
133 words
A film feeding device for a camera adapted to receive film cartridges and including a takeup fork which is moved from a first position to a second position where the spool shaft of said cartridge is released from engagement with the takeup fork, comprising: (a) a sensing member having a first portion for detecting insertion of a film cartridge into a cartridge chamber of said camera and a second portion for detecting closure of the back cover of said camera; (b) a control member having an engaging portion arranged to be released from engagement in response to detecting operation of said sensing member, and operable from the outside of the camera, said takeup fork being rotatably supported on said control member; and (c) bias means urging said takeup fork to said first position.
Claim 11
Dependent Claim
133 words
A film feeding device for a camera adapted to receive film cartridges and including a takeup fork which is moved from a first position to a second position where the spool shaft of said cartridge is released from engagement with the takeup fork, comprising: (a) a sensing member having a first portion for detecting insertion of a film cartridge into a cartridge chamber of said camera and a second portion for detecting closure of the back cover of said camera; (b) a control member having an engaging portion arranged to be released from engagement in response to detecting operation of said sensing member, and operable from the outside of the camera, said takeup fork being rotatably supported on said control member; and (c) bias means urging said takeup fork to said first position.
Claim 12
Dependent Claim
60 words
A device according to claim 8, further comprising (d) a locking member for locking the back cover of said camera in the closed position, said locking member being rendered cooperative with the control member at an intermediate point during the movement of the takeup fork from said first position to said second position to effect opening of the back cover.
Claim 13
Dependent Claim
31 words
A device according to claim 9 further comprising: (e) bias means provided in the cartridge chamber of said camera and urging said film cartridge towards the back cover of the camera.
Claim 14
Dependent Claim
31 words
A device according to claim 10, wherein said bias means is a leaf spring having a fixed end and a free end with its entire body formed to an arcuate shape.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |