| 摘要 |
<p>PURPOSE:To reduce the power consumption while the title device is being operated, and to prevent the deterioration of reliability due to variation with time by a method wherein a movable electromagnet, having the same polarity as that of a fixed permanent magnet and reverse to that of a fixed electromagnet when a current is applied, is arranged between the fixed electromagnet and the fixed permanent magnet. CONSTITUTION:A fixed permanent magnet 2 is arranged opposing to a fixed electromagnet 1, and a movable electromagnet 3 is arranged between said fixed electromagnet 1 and fixed permanent magnet 2. Besides, the winding method of a cord 4 is adjusted, the polarity of the fixed electromagnet 1 when magnetized is directed reverse to that of the fixed permanent magnet 2, and also the movable electromagnet is constituted in such a manner that its polarity is in the direction reverse to that of the fixed electromagnet, namely, the same polarity as that of the fixed permanent magnet 2. Accordingly, when a current is applied, the movable electromagnet 3 maintains a driving state, by repulsing to the fixed permanent magnet 2 and by being attracted to the fixed electromagnet 1 on the other hand, and at this time, the force working to opposite direction by a spring does not occur. As a result, the power consumed while the device is in operation can be reduced, and also the lowering in reliability due to the deterioration of spring can be prevented.</p> |
