| 摘要 |
PURPOSE:To operate or stop the device manually or automatically and, at the same time, open or close a shutter automatically so as to follow the operation of the device by a method wherein a manual operation control switch is provided, a fan is rotated by a fan motor and the shutter is opened by a shutter motor. CONSTITUTION:In case the device is operated manually, the fan motor 4 and the shutter motor 5 are rotated by switching the manual operation control switch 6 into a fixed contact 6B. Then, first link 8 is pivoted and the second link 9 as well as the connecting rod 10 of the shutter 2 are moved downwardly to open the shutter 2. When the shutter 2 is opened perfectly, the first link 8 pushes the push-bottom 11' of a fully opened condition detecting switch 11 and a movable contact piece 11B is separated from the fixed contact 11A. At this moment, the circuit of the shutter motor 5 is opened and, therefore, the shutter motor 5 is stopped. The manual operation control switch 6 is being thrown into the fixed contact 6B side, therefore, the operation of the fan motor 4 is continued. |
