| 摘要 |
PURPOSE:To improve the accuracy of channel selection by increasing the lateral movement of a cam plate more than a half of the pitch of a cam part so that the dimensions of each part such as channel selecting members and butt pins 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 a cam part 4 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 channel selecting members 81, 82 and butt pins 61, 62 satisfies the formulas 1, 2. In the formulas, P is each array pitch of the channel selecting members 81, 82, the cam parts 4 and comb-like parts 12 of the main cam plate 10, D is the diameter of the butt pins 61, 62. 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. |
