| 摘要 |
The present invention relates to a direction setting device comprising a frame (1) that carries a rotatably mounted shaft (2) which supports a first belt pulley (13) whose rotational position defines a direction to be set, wherein a rotary motor (71) carried by the frame supports a second belt pulley, and wherein an endless belt (14) extends around the first and second pulleys. A deflecting means (4, 41, 72) which functions to deflect one part (142) of the belt while the motor (71) is stationary at a set position of rotation, so as to change the effective length of the first part (142) of the belt; and further includes a resilient or springy tensioning means (5, 6, 16, 18) which functions in changing the length of the second part (141) of the belt to compensate for the change in length of the first part of the belt, thereby enabling the first pulley (13) to be turned through an angle dependent on the deflection of the first part (142) of the belt by the deflecting means. |
