| 摘要 |
<p>12 Motor apparatus comprising an elongated motor shaft (212) having a shaft axis and means (328, 216) for supporting the shaft for rotation about the axis; first spring means (320) for applying a first torque in a first rotational direction to the shaft; second spring means (322) for applying a second torque in a second rotational direction to the shaft; and means (284, 286) for selectively releasing the torque of at least one of the spring means to impart rotation to the shaft.</p> |
