Patent ID: 8793884

Claim:
A circle cutting apparatus comprising: an outer ring seat having a round opening and a placing surface; a rotary disc rotatably mounted in said round opening of said outer ring so as to rotate relative to said outer ring seat, said rotary disc having a top surface and a bottom surface and an outer ring portion and a central portion; an elongated through groove formed radially through said rotary disc so as to open at said top surface and said bottom surface thereof, said elongated through groove extending from said central portion to said outer ring portion; an adjustable elastic cutting assembly slidably mounted in said elongated through groove, said adjustable elastic cutting assembly comprising: a holding base having a holding space therein; a cutter slidably positioned in said holding space of said holding base, said cutter having a blade and a cutting base; an elastic element positioned in said holding space of said holding base, said elastic element bearing against said cutting base of said cutter; and an adjusting part positioned in said holding space of said holding base, said adjusting part cooperative with said cutter so as to cause said cutter to slide relative to said holding base, said holding base having a base body and a driven tube slidably positioned in said base body, said holding space formed in said driven tube, said driven tube having an actuating end and a regulating end, said cutter positioned at said actuating end of said driven tube, said actuating end having a through-hole through which said blade of said cutter protrudes, said adjusting part being threadedly secured interior of said regulating end of said driven tube, said elastic element extending between said adjusting part and said cutter, said driven tube having a first radial spacing part extending outwardly therefrom such that said driven tube can slide in relation to said base body, said cutter having a second radial spacing part extending outwardly therefrom such that said cutter can slide in relation to said driven tube.