| 摘要 |
PURPOSE:To hold a head in a horizontal state automatically by sensing the nonhorizontal state of the head by a switch and driving a motor. CONSTITUTION:When a support arm 2 swings clockwise, a switch 9a is turned on, the motor 10 turns clockwise, and a support shaft 7 rotates counterclockwise, so a detector 1 as the head enters a horizontal state. When the arm 2 swings counterclockwise to the contrary, a switch 9b is turned on, the motor 10 turn counterclockwise, and the detector 1 becomes horizontal. Namely, the detector 1 is held horizontally when the arm 2 swings either clockwise or counterclockwise.
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