| 摘要 |
PURPOSE:To stabilize external quality of a molded piece by preventing gas contained in resin flowing in a cavity space from becoming residue so as to stick to a fine gap where a fixed pin and a void pin engage with each other, supplying air stably, and assuredly preventing occurrence of sink mark caused by shrinkage of the resin. CONSTITUTION:A flange 3a is provided on a void pin 3. The flange 3a is positioned at a moving side mounting plate 10. On the moving side mounting plate 10, on the upper and lower faces of the flange 3a of the void pin 3, air supplying holes 13a and 13b for supplying air pressure are provided, respectively. The void pin 3 is moved up and down by the air pressure. |
