Stripper plate mounting apparatus

A stripper plate mounting apparatus for mounting a stripper plate in a detachable and replaceable manner above a front end portion of a punch guide into which a punch including an edge part in its front end portion is fitted movably upward and downward, comprising:

• an adaptor detachably provided to the front end portion of the punch guide, the adaptor holding the stripper plate, and a plurality of lock parts being respectively formed in a plurality of locations on the adaptor;
• and
• a plurality of lock mechanisms provided in a plurality of locations on an outer periphery of the front end portion of the punch guide so as to correspond to locations of the plurality of lock parts formed in the adaptor, respectively,
• wherein the lock mechanisms each comprise:
• a lock piece capable of being locked to, and detached from, a corresponding one of the lock parts formed in the adaptor;
• a biasing module that continuously biases the lock piece outward in a radial direction;
• and
• a lock-holding piece to lock and to hold the lock piece in an inward position when the lock piece is pressed and moved inward in the radial direction, and
• wherein the adaptor is fixed to the punch guide with the lock mechanisms.