Sandwich structured cutter and personal hair trimmer using the same

A personal hair trimmer, comprising a main body assembly and a blade set, the blade set comprising a cutter composed of a reciprocating blade and a fixed blade, and a drive mechanism used for driving the reciprocating blade being arranged inside the main body assembly;

• wherein the cutter is of a sandwich structure, which comprises two fixed blades and a reciprocating blade sandwiched between the two fixed blades, edges of front ends of both the two fixed blades are provided with a row of comb teeth, an inner surface of each comb tooth contacting the reciprocating blade forms an acute angle with a lateral edge of the comb tooth, an edge of a front end of the reciprocating blade is provided with a row of cutting teeth having cutting edges, the edges of the front ends of the two fixed blades are overlapped with each other, the edge of the front end of the reciprocating blade is sandwiched between the edges of the front ends of the two fixed blades and is not exposed out of the edge of the front end of any one fixed blade, and the reciprocating blade is driven by the drive mechanism, so that the edge of the front end thereof makes reciprocating motion with respect to the edges of the front ends of the two fixed blades, thereby realizing trimming of hairs,
• wherein a cross section of the cutting tooth of the reciprocating blade, which is perpendicular to the length direction of the reciprocating blade, is of a parallelogram, and upper and lower opposite sides of the parallelogram are attached onto corresponding inner surfaces of the comb teeth of the two fixed blades respectively, and
• wherein two opposite acute angles of the parallelogram define two cutting edges of the cutting tooth.