| 摘要 |
A film tensioning device for maintaining tension in the film in a film transport system such as a motion picture projector. A tension roller mounted between pressure rollers with the film running over the tension roller, with a spring urging the pressure rollers against the film to prevent slippage of the film on the tension roller. A curved spring carried within the tension roller and engageable with a stop providing sliding friction with the tension roller. The spring is readily removable for substitution of a different spring to provide a different magnitude of tension in the device.
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