| 摘要 |
PURPOSE:To improve reliability, by switching a conduction circuit to a motor with a semiconductor switching circuit, according to the operating direction of a motor suction equipment which is detected by a noncontact switch. CONSTITUTION:So far as the output signals A, B of a power controlling circuit 24 are concerned, when light is transmitted to a photodetector 28 through the opening slot 26 of a slide plate 25, then the output signal A is set to come to a level H and the output signal B is set to come to a level L. Then, transistors 16 and 15 are turned ON, and to a motor 4, from a terminal T2 in the direction of a terminal T1, current flows. When the light to the photodetector 28 is interrupted by the slide plate 25, then the output signal A comes to the level L and the output signal B comes to the level H. Then, transistors 17 and 14 are turned ON, and the current direction to the motor 4 is turned into the direction from the terminal T1 to the terminal T2. As a result, a circuit can be formed without any contact, and a high reliability can be obtained.
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