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Abstract
Abstract THE FILM TRANSPORTING MECHANISM OF A MOTION PICTURE PROJECTOR HAS TWO ROTARY IN-OUT CAMS THE FIRST OF WHICH MOVES THE CLAW OF THE PULL-DOWN INTO AND OUT OF PERFORATIONS OF MOTION PICTURE FILM AT A NORMAL FREQUENCY AND THE SECOND OF WHICH CAN BE SHIFTED AXIALLY TO AN OPERATIVE POSITION SO AS TO OVERRIDE THE FIRST CAM DURING CERTAIN STAGES OF EACH REVOLUTION TO THUS REDUCE THE FREQUENCY OF FILM TRANSPORT. THE SHIFTING DEVICE FOR THE SECOND CAM CONSISTS OF A HELICAL GROOVE MACHINED INTO A CYLINDRICAL EXTENSION OF THE SECOND CAM AND A WIPER WHICH CAN BE MOVED BY HAND TO ENTER THE GROOVE. THE SECOND CAM IS DRIVEN BY A GEAR TRAIN WHICH RECEIVES TORQUE FROM THE SHAFT FOR THE FIRST CAM. THE SHAFT FURTHER ROTATES A SHUTTER AND A TRANSPORTING CAM WHICH MOVES THE PULL-DOWN IN AND COUNTER TO THE DIRECTION OF FILM TRANSPORT.
Inventors
- 👤 Heldemar Radl
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |