| 摘要 |
<p>PURPOSE:To enable always to display sufficiently a faculty provided to a dust collector by a method wherein running of a motor of the collector is made to stop and to be indicated when the motor rotates reversely, or made to convert the rotating direction into the correct direction automatically. CONSTITUTION:The screw part 3-1 is formed at the upper part of a rotating shaft 3 of the three phase induction motor 1, a detecting part 19 is provided being screwed to the screw part 3-1, while a switch 22 to detect when the detecting plate 19 transferred to the upper part is provided. When a switch SW1 for starting is pressed, a relay CR1 is made to operate, while an electromagnetic switch mg1 is conducted to make the motor to rotate. When the rotational direction of the motor is reversal, a contact LSW of the switch 22 is closed to make a relay CR2 to operate, and conduction of the electromagnetic switch mg1 is released to make the motor to stop. When set time lapsed, a contact of timer T1 is closed to conduct an electromagnetic switch mg2, and the motor is made to rotate in the reverse direction.</p> |
