Patent ID: 7290473

Claim:
A pierce cam comprising: a pierce punch; a single one-piece body, said body detachably supporting the pierce punch; a stripper, said stripper being fitted to the pierce punch inward of a leading end portion of the pierce punch and being mounted to the body for movement with respect thereto, said stripper being biased by a coil spring in a direction away from the body; a rotating arm said rotating arm being swingably mounted on the body and movable into contact with a rear end surface of the pierce punch; and a driver, said driver for transferring a descending force of a press machine to the rotating arm and including a hook that hooks and ascends the rotating arm when the driver moves upward, wherein said rotating arm includes first and second circular arc contact points, said first circular arc contact portion being in operable with the rear end surface of the pierce punch and said second circular are contact portion being in operable contact with the driver.