Film transport apparatus for a motion picture camera or projector
US3963334A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1974 |
| Grant date | Jun 15, 1976 |
| Priority date | — |
| Expiry date | Nov 20, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film transport apparatus for a motion picture camera or a motion picture projector comprises a film gate mechanism, a film advancing mechanism for intermittently advancing the film past the exposure or projection aperture, and a takeup reel drive mechanism which permits the takeup reel to wind up the advanced film after it leaves the aperture during the time when the film advancing mechanism is advancing the film and which is arrested to prevent the takeup reel from winding up the film during the time when the intermittently moving film is stopped. From another aspect of the disclosure, the film gate mechanism comprises an aperture plate provided with first and second film alignment abutments fixedly mounted thereon and arranged on one side of the film path in symmetrically spaced relation to the aperture, and with first and second resilient biased film abutments movably mounted thereon and arranged on the opposite side of the film path in symmetrically spaced relation to the aperture to urge the film against the first and second fixed film abutments respectively. In this film channel construction, the points at which the first and second fixed abutments exert friction against th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.