Patent US3794415A successfully refreshed from Google Patents.
US3794415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling loop transport mechanism
Assignee: MULTISCREEN CORP Ltd
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Filing: 1972-07-13
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Granted: 1974-02-26
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Expires: 1992-07-13
Abstract
Abstract The invention provides a mechanism for transporting photographic film past an aperture in a projector, camera or other motion picture machine, and more particularly to a rolling loop film transport mechanism which transports film between a rotor and a stator for placing frame lengths of the film against an aperture in the stator such that each frame length then has substantially the same curvature as the aperture independently of the curvature of the stator.
Inventors
- 👤 P Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:16
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/18; G03B1/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
240 words
A film transport mechanism for a motion picture machine in which a film is intermittently transported through a predetermined frame length in relation to an aperture, said film transport mechanism comprising: a stator curved about an axis of curvature; a rotor co-operating with said stator to define a passage for said film and rotatable about said axis, said rotor having gaps for receiving film loops; an inlet in said stator through which said film is fed into said passage; an outlet in said stator through which said film is withdrawn from said passage; an aperture plate coupled to the stator intermediate said inlet and said outlet and defining the aperture, the plate including an inner surface having a curvature different from that of the stator, the axis of curvature of the plate surface being parallel to and spaced from the axis of curvature of the stator towards the inlet by an amount substantially equal to half of the circumferential extent of the aperture; film moving means for feeding said film into said inlet at a controlled speed of said rotor and for withdrawal of said film from said outlet at said controlled speed; and film locating means coupled to the stator for co-operating with said film moving means to gradually increase and then gradually decrease said film loop in said gap and to intermittently hold said film in fixed position in registration with said aperture plate surface about the aperture.
Claim 2
Dependent Claim
240 words
A film transport mechanism for a motion picture machine in which a film is intermittently transported through a predetermined frame length in relation to an aperture, said film transport mechanism comprising: a stator curved about an axis of curvature; a rotor co-operating with said stator to define a passage for said film and rotatable about said axis, said rotor having gaps for receiving film loops; an inlet in said stator through which said film is fed into said passage; an outlet in said stator through which said film is withdrawn from said passage; an aperture plate coupled to the stator intermediate said inlet and said outlet and defining the aperture, the plate including an inner surface having a curvature different from that of the stator, the axis of curvature of the plate surface being parallel to and spaced from the axis of curvature of the stator towards the inlet by an amount substantially equal to half of the circumferential extent of the aperture; film moving means for feeding said film into said inlet at a controlled speed of said rotor and for withdrawal of said film from said outlet at said controlled speed; and film locating means coupled to the stator for co-operating with said film moving means to gradually increase and then gradually decrease said film loop in said gap and to intermittently hold said film in fixed position in registration with said aperture plate surface about the aperture.
Claim 3
Dependent Claim
223 words
A film transport mechanism for a motion picture machine in which a film is intermittently transported through a predetermined frame length in relation to an aperture, said film transport mechanism comprising: a stator curved about an axis of curvature; a rotor co-operating with said stator to define a passage for said film and rotatable about said axis, said rotor having gaps for receiving film loops; an inlet in said stator through which said film is fed into said passage; an outlet in said stator through which said film is withdrawn from said passage; an aperture plate coupled to the stator intermediate said inlet and said outlet and defining the aperture, the plate including a flat inner surface positioned tangentially to the curvature of the stator with said surface extending from the point where the surface meets the stator generally towards the inlet; film moving means for feeding said film into said inlet at a controlled speed relative to the speed of said rotor and for wIthdrawal of said film from said outlet at said controlled speed; and film locating means coupled to the stator for co-operating with said film moving means to gradually increase and then gradually decrease said film loop in said gap and to intermittently hold said film in fixed position in registration with said aperture plate surface about the aperture.
Claim 4
Dependent Claim
223 words
A film transport mechanism for a motion picture machine in which a film is intermittently transported through a predetermined frame length in relation to an aperture, said film transport mechanism comprising: a stator curved about an axis of curvature; a rotor co-operating with said stator to define a passage for said film and rotatable about said axis, said rotor having gaps for receiving film loops; an inlet in said stator through which said film is fed into said passage; an outlet in said stator through which said film is withdrawn from said passage; an aperture plate coupled to the stator intermediate said inlet and said outlet and defining the aperture, the plate including a flat inner surface positioned tangentially to the curvature of the stator with said surface extending from the point where the surface meets the stator generally towards the inlet; film moving means for feeding said film into said inlet at a controlled speed relative to the speed of said rotor and for wIthdrawal of said film from said outlet at said controlled speed; and film locating means coupled to the stator for co-operating with said film moving means to gradually increase and then gradually decrease said film loop in said gap and to intermittently hold said film in fixed position in registration with said aperture plate surface about the aperture.
References Cited (Backward Citations)
US3600073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |