| 摘要 |
A canister for film, tape, or like material wherein the film is propelled by means exterior of the canister during the winding and unwinding thereof. The canister includes a deflection spring pivotally connected thereto, extending in the free state across a chordal portion of the canister, and adapted to be moved in a direction to conform with the interior surface of the canister wall when film is pressed against the spring upon winding of the film within the canister. The spring is deflected by reason of the increasing pressure of the film loops thereagainst to permit a greater length of film to be coiled inside the canister.
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