| 摘要 |
PROBLEM TO BE SOLVED: To provide a unit which is constituted so that a film can be exchanged without damaging an expensive rear cover and the like and which can be used several times by constituting it so that an engaged state between a movable pawl and a fixed pawl can be released by actuating a movable member by resisting to the pressing force of a pressing member only when a prescribed tool is inserted in a through-hole. SOLUTION: The key-like dedicated tool 11 is used. Then, the first shaft 11a thereof is inserted in a round hole 3a and the second shaft 11b thereof formed in parallel with the shaft 11a is inserted in the upper end of a long hole 3b. Besides, a hole is formed at the side surface of the unit opposed to the hole 3a. Since the shaft 11a is also inserted in this hole, the tool 11 is stably positioned. Besides, the shaft 11b inserted in the upper end of the hole 3b is inserted in a notch formed at the almost center of a movable pawl plate. Thus, since the movable pawl plate is slid downward by resisting to the elasticity of a tension spring when the shaft 11b is rotated counterclockwise with the shaft 11a as a supporting shaft by holding a knob 11e, the engaged state between the movable pawl and the fixed pawl is released and the rear cover is opened.
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