| 摘要 |
Apparatus for controlling the advance of unperforated rollfilm in a camera from a supply spool to a take-up spool. Film advancing means is provided to rotate the take-up spool by an amount which at least equals the maximum rotation of the spool required to advance the film according to the preselected spacing between successive exposures on the film. A differential responds to rotation of both the supply and the take-up reels and provides an output which indicates the extent of rotation of both the spools. The differential provides a distinctive output when the output of the differential attains a predetermined magnitude, and this output terminates further advancing of the film.
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