Patent ID: 7802506

Claim:
An upper tool device, comprising: a punch guide; a punch body provided with a first screw portion at an upper end of the punch body, the punch body being fitted into the punch guide in a manner such that punch body is movable in a vertical direction; a punch head provided with a second screw portion engaging with the first screw portion of the punch body so that the first screw portion of the punch body is screwably mounted in the punch head, the punch head having a flange member; a spring seat into which the punch head is fitted in a manner such that the punch head is movable in a vertical direction, and a key member that prevents the punch head from rotating relative to the spring seat; a retainer collar provided between the spring seat and the punch guide, the retainer collar including a stopper piece having a tip end disengageably engaged with a punch body stopper formed on the punch body restrict and arrest relative rotation of the punch body to the retainer collar; the retainer collar is detachably attached to an upper portion of the punch guide; and an elastic member mounted between the punch head and the spring seat, wherein the punch head, the spring seat and the elastic member comprise a stripper unit; and the stripper unit being detachably mounted to the retainer collar so as to be detachable from the retainer collar when the first screw portion of the punch body is disengaged from the second screw portion provided on the punch head.