| 摘要 |
PURPOSE:To obtain the island down device enabled to enhance yield of manufactured goods by a method wherein the island part of a lead frame is lowered than the inner lead part. CONSTITUTION:When a rotating member 41 is rotated, the rear edge part thereof descends, a sliding member 33 descends according to tensile force of a spring 35, and an arm 37 also descends. Accordingly, frame press pins 39, 40 descend, and come in contact with both the edge parts (points A, A') of the island part 2 at the lead frame 1. Because a concave part 21 is formed in a heater 14 under the island part 2, plastic transformation is generated at the island part 2 according to pushing pressure of the frame press pins 39, 40, and the part is lowered than the inner lead part 3. Inversely, when a heater driving shaft 13 descends, the heater 14 descends, and the rotating member 41 is rotated in the direction shown with an arrow mark b. Accordingly, the sliding lever 33 and the arm 37 ascend opposing against tensile force of the spring 35. The lead frame 1 is sent out and sent in during this period, and action thereof is repeated. |
