| 摘要 |
A system for uniformizing the speed at which a kinematographic film is wound round the take-up spool in a view-taking or projecting apparatus by means of a feeler engaging a loop formed by the film between the exposure gate and said spool. When ever the speed of winding excessively tensions the film passing out of the gate, the loop shrinks and the stops the spool either by opening a switch in the circuit feeding a driving motor or by mechanically acting on a roller or gear driving the spool For reversed progression a second roller or gear can be used which is similarly controlled by the feeler.
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