Abstract: This stapling machine has mechanical means to block the path of the staple plunger to prevent a staple driving operation unless the stapler is on a work piece in position to drive the staples into the work piece. The magnetic coil comprises a pair of inner and outer bobbins of high heat resisting, electric insulating material, with a barrier bobbin in between said pair of bobbins, to keep whatever might break down one of said pair of bobbins from breaking down the other of said pair of bobbins, to thereby protect electrical components of the electro-magnetic stapler. The lower end of the armature controlled by the electro-magnetic coil of the stapler, has a conical cavity at its lower end movable to a position receiving but not contacting a conical core at the lower end of the coil, to give extra power to the armature because of greater magnetic surface between the armature and core and yet preventing actual thrust contact blows between the armature and core, which might damage the stapler machine.