| 摘要 |
PROBLEM TO BE SOLVED: To switch film tunnel amount by driving a film pressing plate from the outside. SOLUTION: When a pressing plate driving member 12 pivotally supported on a back cover is rotated clockwise by 90 deg., the film pressing plate 9 is driven by a solid cam 12b and floats from an outside rail surface 1b against the energizing force of a pressing plate spring 4. At such a time, a driven roller 8 integrated with the plate 9 is engaged with the circular-arc part of a cam groove 12a and does not move right and left. In a state where the roller 8 is engaged with the cam part of the groove 12a and driven leftward, the plate 9 is kept in a state where it floats from the rail surface 1b by the cam 12b. When the roller 8 approaches to the trailing end of the groove 12a, the leftward advance of the plate 9 is stopped, and the pressing of the plate 9 by the cam 12b is released, then the low step part 9b of the plate 9 abuts on the rail surface 1b, whereby the film tunnel amount is switched.
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