| 摘要 |
PURPOSE:To obtain a reduction gear free from noise and vibration by allowing the captioned apparatus to be equipped with a magnet installed onto the driving shaft of a motor, fixed shaft fixed at a prescribed interval from the magnet, and a movable shaft which is movable in the direction of transfer of the magnet. CONSTITUTION:When a permanent magnet 23 is at (a) point, the second magnetic member 27 is at the smallest magnetic-resistance position for the first magnetic member 24. When the permanent magnet 23 reaches the position of the first magnetic member 24 departed by the first interval PA, namely (b) point, accompanied with the rectilinear movement of the driving shaft 22 of a motor, a driven shaft 29 tends to shift to the smallest magnetic-resistance position again. Since the second interval PB is constituted to be 1/2-1 of the first interval PA at this time, the driven shaft 29 shifts by PA-PB in the same direction to the transfer of the permanent magnet 23 and is positioned at the smallest magnetic- resistance position. |
