Blade mounting and dismounting jig, blade mounting and dismounting method, blade extracting method, and cutting apparatus

A blade mounting and dismounting jig for mounting a blade on and dismounting a blade from a flange of a cutting apparatus which includes at least a boss, a blade mount for mounting the blade fitted thereover, the flange having an annular end face for supporting the blade thereon and being fixed to a distal end of a spindle, and a holder that cooperates with the flange in gripping and securing the blade in position, said blade mounting and dismounting jig including:

• a cylindrical jig body having a recess defined in a distal end portion thereof, the distal end portion having a diameter same as that of said blade mount, said recess being receptive of said boss fitted therein;
• a grip coupled to said jig body and having a diameter larger than said jig body;
• a plurality of first air ejection ports defined in the distal end portion of the jig body;
• a plurality of second air ejection ports defined in the jig body at a juncture between said jig body and said grip;
• a first fluid communication route for bringing said first air ejection ports into fluid communication with an air source under control of a controller;
• and
• a second fluid communication route for bringing said second air ejection ports into fluid communication with the air source under control of the controller.