Patent US3815983A successfully refreshed from Google Patents.
US3815983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic rewind mechanism for motion picture projector
Assignee: Eastman Kodak Co
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Filing: 1973-05-02
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Granted: 1974-06-11
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Expires: 1993-05-02
Abstract
Abstract An automatic rewind mechanism for a motion picture projector in which an operative slide is provided to establish the position of the film gate, the position of the pulldown claw, the position of an optical douser and set the drive mode for the supply and takeup spindles when rewind is desired. The operative slide is controlled by a release latch which, in turn, may be triggered by either a film tension sensing snubber or a manual ''''run-rewind'''' control selector. The control selector is automatically shifted to its ''''rewind'''' indicating position when the operative slide is actuated by tension sensing initiated triggering of the release latch.
Inventors
- 👤 W Burnham
- 👤 K Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:45
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
300 words
In a motion picture apparatus in a forward projection mode and a rewind mode, said apparatus including a film supply reel and a film take-up reel, a film projection gate, a film transport means for driving film from said supply reel to said take-up reel along a predetermined path through said projection gate in said forward projection mode, and means for driving said supply reel in order to rewind the film thereon when said apparatus is in said rewind mode, an improved mechanism for automatically initiating said rewind mode, the improvement comprising: an operative slide movable between a first position and a second position, means responsive to movement of said operative slide to its second position to open said gate to permit unrestricted passage of film therethrough, means responsive to movement of said operative slide to its second position to render said transport means inoperable, and said means responsive to movement of said operative slide to its second position to activate said means for driving said supply reel; a release latch for retaining said operative slide in its first position when said motion picture apparatus is in said forward projection mode and selectively actuatable to release said operative slide when said rewind mode is to be initiated; first release means responsive to a condition of the film in said predetermined path for selectively actuating said release latch; second release means for selectively actuating said release latch, said second means being manually operable between a first position giving a visual indication that the motion picture apparatus is in its forward projection mode and a second position giving a visual indication that the motion picture apparatus is in its rewind mode; and means for moving said second release means to its second position in response to actuation of said first release means.
Claim 2
Dependent Claim
300 words
In a motion picture apparatus in a forward projection mode and a rewind mode, said apparatus including a film supply reel and a film take-up reel, a film projection gate, a film transport means for driving film from said supply reel to said take-up reel along a predetermined path through said projection gate in said forward projection mode, and means for driving said supply reel in order to rewind the film thereon when said apparatus is in said rewind mode, an improved mechanism for automatically initiating said rewind mode, the improvement comprising: an operative slide movable between a first position and a second position, means responsive to movement of said operative slide to its second position to open said gate to permit unrestricted passage of film therethrough, means responsive to movement of said operative slide to its second position to render said transport means inoperable, and said means responsive to movement of said operative slide to its second position to activate said means for driving said supply reel; a release latch for retaining said operative slide in its first position when said motion picture apparatus is in said forward projection mode and selectively actuatable to release said operative slide when said rewind mode is to be initiated; first release means responsive to a condition of the film in said predetermined path for selectively actuating said release latch; second release means for selectively actuating said release latch, said second means being manually operable between a first position giving a visual indication that the motion picture apparatus is in its forward projection mode and a second position giving a visual indication that the motion picture apparatus is in its rewind mode; and means for moving said second release means to its second position in response to actuation of said first release means.
Claim 3
Dependent Claim
92 words
The structure of claim 1 wherein said first release means includes a film snubber in contact with the film, biasing means of a preset value for biasing said snubber into contact with the film to maintain a preset tension in the film, a pivotable latch normally engaged with said release latch to maintain said release latch in its latching position, and means associated with said snubber engaeable with said pivotable latch when said preset value is exceeded to release said release latch to permit said release latch to release said operative slide.
Claim 4
Dependent Claim
65 words
The structure of claim 1 wherein said second release means includes a control knob, a shaft connected to said control knob and rotatable thereby, a lever mounted for pivotal movement and engageable with said release latch, eccentric cam means rotatable with said shaft, and engageable with said lever whereby movement of said eccentric cam will cause movement of said lever to release said release latch.
Claim 5
Dependent Claim
61 words
The structure of claim 3 wherein a second cam is mounted on said shaft and wherein said means for activating said supply reel drive means includes a lever engageable with said second cam, said lever being actuated by said second cam when said shaft is rotated to position said control knob of said second release means in its rewind indicating position.
Claim 6
Dependent Claim
103 words
The structure of claim 4 wherein said means for moving said second release means to its second position when said release latch is selectively activated by said first release means comprises an opening formed in said operative slide through which said lever extends, the location of said opening being selected such that upon movement of said operative slide from said first position to said second position one end wall of said opening will engage said lever to pivot said lever whereby said lever will rotate said eccentric cam to rotate said shaft and the control knob associated therewith to the rewind-indicating second position.
References Cited (Backward Citations)
US2009442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |