| 摘要 |
PURPOSE:To improve the accuracy of channel selection by increasing the lateral movement of a cam plate to more than a half of the pitch of a cam part so that the dimensions of each part such as a channel selecting member and a butted pin satisfies the prescribed quantity of movement. CONSTITUTION:A main cam plate 10 and an auxiliary cam plate 11 are interlocked so as to move relatively in the moving direction. In the right or left limit of the auxiliary cam plate 11 for the main cam plate 10 based upon said movement, the right or left inclined part of each cam part is continued to the right or left inclined parts of angle cam parts 21 of the auxiliary cam plate 11 and the dimensions of each part such as a channel selecting member 8 and a butted pin 61 satisifes the formulas 1, 2. In the formulas, P is each array pitch of the channel selecting member 8, the cam parts and comblike parts 12 of the main cam plate 10, D is the diameter of the butt pin 61, l is the quantity of movement of the auxiliary cam plate 11, l' is the quantity of relative movement of the main cam plate 10 and the auxiliary cam plate 11, (a) is the width of a projection piece, and W is the width of the comb-like part 12. Thus, the accuracy of channel selection can be improved by making the dimensions of each part satisfy the formulas 1, 2. |
