| 摘要 |
PURPOSE:To prevent an impact of a terminating position by judging a length of a curtain rail to decide a curtain position for decelerating a motor speed, and decelerating the motor speed as approaching from the curtain position for decelerating the motor to the end of the curtain. CONSTITUTION:When a motor 7 is driven to open a curtain, an output of a monostable multivibrator 9 is counted by a pulse counter(PC) to detect a curtain position. That is, since the length of the curtain is known from the counted value of the PC, a decelerating point is decided by multiplying the counted value of the PC by a predetermined constant (<1). A control circuit 10 controls an output voltage of a DC power source 5, and so sets the opening/closing speed of the curtain from the decelerating point to the end based on the entire length of the rail and the speed of the decelerating time point, etc., that an impact at the end position falls within an allowable range. |
