Rotary chisel cutter

A cutting device for cutting sheet material cut on a support surface comprising:

• a circular cutting tool including means for cutting extending along the circumference thereof;
• support means for supporting said circular cutting tool, such that said circular cutting tool freely rotates within said support means to thereby roll on the surface of the sheet material when said cutting means contacts the sheet material;
• and
• impact means interconnected to said support means for generating and imparting an intermittent high impact force to said circular cutting tool in a direction normal to the axis of rotation of said circular cutting tool for moving said cutting means into intermittent cutting engagement with the sheet material such that said cutting means periodically impacts the sheet material support surface to thereby cut the sheet material with a minimal vertical displacement of said circular cutting tool to substantially minimize heat generation in the sheet material during the cutting operation.