Patent ID: 7958807

Claim:
An upper tool, comprising: a punch body having a punch blade at a lower end of the punch body; a punch guide into which the punch body is fitted so as to be movable in a vertical direction; a punch head provided above the punch guide, an adjustment screw being provided on the punch head and screwed onto a screw provided on the punch body; a stripper unit comprising a spring seat and an urging member, the urging member urging the punch body in an upward direction via the punch head and the spring seat, the stripper unit being detachable from the punch body together with a retainer collar, and the spring seat being detachably connected to the retainer collar with its rotation restricted relative to the retainer collar and movable in the vertical direction relative to the punch head; and the retainer collar provided between the punch guide and the stripper unit and detachably attached to an upper portion of the punch guide and the stripper unit, an upper surface of the retainer collar being engaged with a lower surface of the spring seat, wherein the retainer collar is configured to be selectively made rotatable or to have its rotation restricted relative to the stripper unit, and wherein both the upper surface of the retainer collar and the lower surface of the spring seat are positioned beneath the urging member with respect to the vertical direction.