GB319246A - Improvements in and relating to film driving means for use in sound recording or reproducing apparatus - Google Patents
Improvements in and relating to film driving means for use in sound recording or reproducing apparatusInfo
- Publication number
- GB319246A GB319246A GB28320/29A GB2832029A GB319246A GB 319246 A GB319246 A GB 319246A GB 28320/29 A GB28320/29 A GB 28320/29A GB 2832029 A GB2832029 A GB 2832029A GB 319246 A GB319246 A GB 319246A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- drum
- sprocket
- roller
- idler
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
Landscapes
- Details Of Cameras Including Film Mechanisms (AREA)
Abstract
319,246. British Thomson-Houston Co., Ltd., (Assignees of Heisler, C. L.). Sept. 18, 1928, [Convention date]. Film-feeding mechanism. - Mechanism for driving a sound-record film past the recording or reproducing device comprises a drum, an idler, and a driven member, the film passing over each of these members in turn. To prevent excessive tension in the film and, where the driven member is a sprocket, to eliminate irregularities in the driving action of the sprocket, the driven member assists in driving the drum through friction rollers. In the apparatus shown, which is for reproducing sound from a combined picture film and sound record, the film 1 passes over a drum 5, an idler roller 22, and a sprocket 20 which is driven uniformly by means such as an electromotor. A friction roller 21, secured to the sprocket, engages with a roller 23 fixed on the idler shaft 24, and the roller 23 also engages a friction roller 17 mounted on the drum 5. The roller 17 is in frictional engagement with the drum, and is so held by a nut 18 that no slipping normally occurs. The shaft 24 is carried by a jointed pivoted bracket 25, 26, controlled by an adjustable spring 28. With the arrangement described, the drum is driven jointly by the film and by a positive connection through the friction rollers with the sprocket 20. The dimensions of the rotating parts are so chosen that the idler has a peripheral speed slightly greater than the speed of the film thereon; thus the tension in the part of the film between the idler and the sprocket is diminished. Optical apparatus.-The drum 5 is made in two parts 6, 7, mounted on a shaft 8 and spaced apart by a distance slightly greater than the width of the sound record 3 on the film. The part 7 is detachable. A narrow light beam is passed through the film on to a photo-electric cell 13, which is located within the drum. The cell is mounted on a bracket 14, surrounding a reduced part of the shaft 8 and supported by an arm 15 extending through the space between the parts of the drum.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US319246XA | 1928-09-18 | 1928-09-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB319246A true GB319246A (en) | 1930-12-18 |
Family
ID=21862133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28320/29A Expired GB319246A (en) | 1928-09-18 | 1929-09-18 | Improvements in and relating to film driving means for use in sound recording or reproducing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB319246A (en) |
-
1929
- 1929-09-18 GB GB28320/29A patent/GB319246A/en not_active Expired
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