| 摘要 |
PURPOSE:To dispense with fixing fittings for a switch and a solenoid and a protecting cover for oil dust by placing the switch and solenoid in a casing which is also served as the bottom cover of a synchronous motor in combination incoporating the other electric parts. CONSTITUTION:A switch 11, a cam 10, a shaft 7, and a solenoid 9 are placed in a casing 8 which builds in the other electric parts 12 except members constituting an opening and closing device of a shutter and protects then from oil dust. This casing 8 is also served as the bottom cover of a synchronous motor 6 and is secured to the motor 6 with the cover 8a of the casing. The solenoid 9 and the contact pieces 11a and 11b of the switch 11 are fixed by only inserting them into the fixing parts 9e, and 11c in the casing 8. Therefore, screw setting is not necessary and also fixing fittings to secure them are not necessary, too.
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