PURPOSE: To execute triple knockout working by allowing the upper die provided with a punch related part and an ejector, and the lower die provided with a die related part corresponding to the upper die and an ejector to cooperate with each other. ;CONSTITUTION: The upper die 1 is provided with a punch body 7 being freely movable vertically in a punch guide 5, and in the axis center tip part of the body 7, a punch chip 19 is provided. Also, between the punch chip 19 and a cutting edge part provided in the tip part of the punch body 7, a second ejector 23 energized downward by a second process spring 25 is provided. The lower die 3 is provided with a die chip 33 in the lower part of a die 29, and in the axis center part of the chip 33, a first ejector 37 energized upward by a first process spring 35 is provided. Moreover, between the die 29 and the die chip 33, a third ejector 41 energized upward by a third process spring 51 is provided. By working executed by cooperation of these upper and lower dies, the time for set-up and working is shortened remarkably.;COPYRIGHT: (C)1993,JPO&Japio
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