| 摘要 |
An improved photographic film supply and threading mechanism which enables a person to prepare a document record camera 44,45 for use without having to feed the film 36 through a complex system of guides and rollers 38, 42 within the body of the camera where the lens and shutter system are exposed to possible displacement and damage. The film 36 is simply fed around a pattern of rollers 38, 42 from a supply reel 22 to a take-up reel 26 mounted on a suitable support assembly 10,14. The assembly is then placed into the body of the camera 44,45 where a combination of film tension arms 59,71 and associated motor control switches act 60,72 together to position the film 36 along a path crossing the image plane 44 of the camera where when the assembly is in position as sensed by a switch 74 it may be exposed as the camera control circuit FIG. 4 advances the film.
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