Paper punch apparatus

A paper punch apparatus for forming a binding hole(s) into one or more paper sheets between a bit reception plate and a tubular hole punch bit, wherein

• the bit reception plate includes a supporting axis, a flange portion at one end thereof, and a discoidal main body at another end thereof, and
• a main body of the punch apparatus includes an insertion/removal portion for insertably supporting the supporting axis, a flange-storing space for storing the flange portion, a bit-reception-plate engagement/disengagement portion for engagement/disengagement with respect to the flange portion of the bit reception plate in the flange-storing space,
• an engagement/disengagement concave portion is formed in the flange portion, and
• the bit-reception-plate engagement/disengagement portion includes an engagement/disengagement protrusion for engagement/disengagement with respect to the engagement/disengagement concave portion, an engagement/disengagement member to be resiliently urged toward the engagement/disengagement concave portion, and an engagement/disengagement member operation portion for vertically moving the engagement/disengagement member,
• the engagement/disengagement member includes a large-diameter circularly cylindrical portion and a small-diameter rod portion that are colinearly disposed via a stepped face,
• the engagement/disengagement member operation portion resiliently supports an oscillatory movement piece, which oscillatorily moves with a central position as an oscillatory-movement supporting point, and
• one end of the oscillatory movement piece is fitted on the stepped face of the engagement/disengagement member and resiliently supported and another end of the oscillatory movement piece is abutting a manipulation knob which is fitted to the main body of the punch apparatus.