| 摘要 |
PURPOSE:To increase the movable quantity of a movable material to enhance the channel selection precision, by using the channel selection material having a pair of striking parts and a movable material dependent upon four movable plates having inclined parts. CONSTITUTION:When striking part 16 out of a pair of striking parts agrees the first with the intersection of the V-shaped part, which is formed by inclined parts 21 and 22 which the first and the second movable plates 19 and 20 have, due to advance of channel selection material A, movable forces in different directions act on movable plates 19 and 20 by the depression force acting on the intersection, and movable plates 19 and 20 are moved oppositely by rotation lever 24 in the direction where the V-shaped part is deeper. Therefore, the third and the fourth movable plates 19' and 20' linked pivotally to lever 24 are moved in opposite directions; however, since the inclination direction of inclined parts 21 and 22' of movable plates 19 and 20' fixed pivotally to pivot 25 and the inclination direction of inclined parts 22 and 21' of movable plates 20 and 19' fixed pivotally to pivot 25' are opposite to each other, movable plates 19' and 20' are moved oppositely in the direction where the V-shaped part is shallower. As the result, the movable quantity of movable material C is increased, so that the channel selection precision can be enhanced. |
