| 摘要 |
First and second cams (9A,B) are rotated in a direction determined by a rotation direction of a knob (5) by first and second operation portions (73A,B) extending from the knob (5). A first switch element (23) is switched on when the first cam is rotated in one direction around the second shaft (X2), by a pressing portion (92) of the first cam at one side thereof. A second switch element is switched on when the second cam is rotated in the other direction around the second shaft (X2), by a pressing portion (92) of the second cam at the other side thereof. As viewed in a shaft direction of the rotary shaft (X2), (a) the first and second switch elements (23,24) and (b) the pressing portions (92,b) are respectively arranged to be symmetrical around the second shaft (X2). |
