| 摘要 |
A first guide rail ( 11 ), and a second guide rail ( 12 ) and a third guide rail ( 13 ) that are parallel to each other are installed on a base ( 2 ) so as to be perpendicular to each other, and these guide rails are rotated about shafts ( 4 ) installed on both ends. When the guide rails are rotated, an indication bar ( 3 ) installed on a rotor ( 1 ) is moved synchronously with the movement of the guide rails, so that the rotor ( 1 ) is also rotated. A slider ( 22 ) installed on the indication bar ( 3 ) slides along a slit ( 21 ) of the third guide rail ( 13 ). Then a rotation angle of the rotor ( 1 ) about the indication bar ( 3 ) is determined by the distance between the guide rails.
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