| 摘要 |
PROBLEM TO BE SOLVED: To provide a shutter having a novel construction for preventing such a trouble that a slat is wound in the opposite direction.SOLUTION: The shutter employing a system to wind a slat 10 on a shaft 20 comprises: an action body 22 provided on the shaft 20 for appearing when the slat 10 is wound off; and an abnormality detecting switch 50 having a first action part 51 on which the appearing action body acts. The action body 22 is provided at a predetermined position on the shaft 20 so that it appears when the slat 10 is wound off until the shutter is fully closed. When the slat is further wound off than in the state that the shutter is fully closed, the action body 22 acts on the first action part 51 to actuate the abnormality detecting switch 50. This prevents the slat 10 from being wound in the opposite direction after the shutter is fully closed. |
