| 摘要 |
A film rewinding mechanism for underwater cameras comprises a rewinding shaft adapted to engage film rewind gearing for film rewinding and to disengage from the gearing during film advancement. The shaft is provided with two coaxial gears having areas formed without teeth. During film advancement, the areas without teeth are in alignment to disengage the shaft from the rewind gearing; and during rewinding, the areas without teeth are out of alignment to form a continuous toothed gear in engagement with the rewind gearing.
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