| 摘要 |
PURPOSE:To suppress excess current at the time of switching the rotating direction of a motor, by interrupting signal to a semiconductor switching circuit for a fixed time, when the rotating direction of the motor is switched. CONSTITUTION:A partition plate 28 interlocked with the moving direction of a motor suction equipment is moved, and the level of the output signal VA of a photodetector 33 comes to H or L. This signal VA is fed to a NAND circuit 47 via differentiating circuits 36, 38 and inverters 45, 46. In this case, at the time of switching the rotating direction, the output of pulse VE is generated. Every time the input of the pulse VE to a flipflop circuit 48 is provided, the output is switched. From inverters 53, 54, at the time of switching the rotating direction, with the delay of a fixed time, the output of rotating direction controlling signal VK or YL is generated. In the meantime, every time the input of the pulse VA to a one-shot multi-vibrator 57 is provided, the output of the pulse VM of a fixed time range is generated, and rotating direction controlling signals VK, VL are forcibly short-circuited.
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