| 摘要 |
<p>PURPOSE:To position the leadframe with a good reproductivity at a high accuracy by moving perpendicular to the leadframe a main pin with a tapered tip arranged between two auxiliary pins each with a flat, tapered tip separated at a given space. CONSTITUTION:After the leadframe is moved to the given position in the direction A, with the action of cams 22 and 22', locked holders 17 and 17' are released sliding so that the main pin 11 and two auxiliary pins are inserted into the reference hole 14 of the frame. As the space between the pins 25 are equal to the sum of the length of the pitch of the hole 14 and the frame 15, the pins 25 are accurately inserted into the holes of the adjacent frames and thus, the main pin 11 is inserted into the hole 14 of the same frame 15 at a sufficent space. As the tip of the auxiliary pins 25 is tapered, slight deviation in the distance of the hole 14 from the corresponding pins 11 and 25 can be overcomed by the pin 25. Thus, the main pin ensure in substance highly accurate positioning of the frame.</p> |
