| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inner blade for securing sufficient structural strength of a small blade while a cutting blade is small in angle and cuts well. <P>SOLUTION: The inner blade 12 includes: a front and back pair of installation walls 20, 20; and a group of small blades 21 long in the front and back direction which link both of the installation walls 20, 20. The small blade 21 includes: a shear plane 31 and a non-shear plane 32 parallel to each other; and right and left curved surfaces 33, 34 which scoop a flesh wall between the right and left side edges. On the right and left both side edges of the shear plane 31 of the small blade 21, cutting blades 35, 35 at acute angle are formed, scooped depths of the right and left curved surfaces are made to differ from each other, and a cross section of the small blade 21 is formed into a horizontally asymmetrical bell-mouse shape. A planar view shape of the small blade 21 in a unfolded state is formed into a bent shape in which a recessed edge part 26 and a projected edge part 27 follow each other by turns, the scooped depths of the curved surfaces 33, 34 on the projected edge part 27 are set larger than those of the curved surfaces 33, 34 in the recessed edge part 26, and an angle α1 of the cutting blade 35 at the projected edge part 27 is set smaller than an angle α2 of the cutting blade 35 at the recessed edge part 26. <P>COPYRIGHT: (C)2012,JPO&INPIT |
