| 摘要 |
A double-blow header, a fixed die, a tool or punch slide, a crankshaft operably connected to the tool slide for reciprocating the tool slide toward and away from the die, a punch carrier movably supported on the tool slide, a plurality of punch assemblies carried by the punch carrier, each of the punch assemblies comprising a punch and punch knock-out pin and a pivoted punch knock-out lever for advancing the punch knock-out pin in the punch when moved in one direction about its pivot, a new and improved punch knock-out actuating mechanism including a reciprocal rod mounted on a fixed part of the machine and extending in the direction of the tool slide, a lever for actuating the punch knock-out levers of the punch assemblies, a pivoted lever arm for moving the reciprocal rod, and an adjustable timing cam operated at one-half the speed of the crankshaft for swinging the lever arm and thereby actuating a knock-out lever of a punch assembly through the rod when the tool slide recedes from the fixed die.
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