Patent ID: 6341549
Filing Date: 2002-01-29
Classification: B26D,B26F,H01L,Y10T

Abstract:
A trimming apparatus comprising a lower die and an upper die, whereinthe lower die comprises: a transfer rail for transferring a lead frame on which package bodies are integrated; a scrap trim die that includes a first projection and an outlet, wherein for trimming, the first projection contacts the lead frame and the outlet is under a scrap being trimmed and provides a route for discharging the scrap after trimming; and a dambar trim die for trimming dambars; and the upper die comprises: a scrap punch die that includes a second projection and a trim punch, wherein the second projection cooperates with the first projection to hold the lead frame for trimming, the trim punch is above the outlet and trims the scrap by moving down through the outlet, and the trim punch provides a route for gas flow through the outlet even while the trim punch moves through the outlet, the route being formed on a portion, which trims the scrap of the trim punch; and a dambar punch die.