| 摘要 |
A motorized film winding and rewinding mechanism includes a take up drum for advancing a film and a motor to drive the take up drum. A spool for rewinding a film is connected to the take up drum through a series of gears so that it rotates in such a manner to allow transfer of film between the spool and the take up drum. A second system of gears that includes a floatable subgear system that moves between first and second positions connects the motor to the take up drum. A lever moves the floating subgears system from the first position to the second when the film reaches the end of the roll to change the path through the gear system and rotate the take up drum and spool in the opposite direction so that the motor rewinds the film.
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