A kind of improved structure for knife of rice cutting machine,Pre-position on front side of the cutter system installing what rice cutting machine,System includes the majority cutter and bottom knife for being in arrangement kenel,Wherein on this,On the fixed what rice cutting machine of bottom knife system difference,Lower tool apron,And it is stacked cutter system above what bottom knife； Wherein the bottom knife predetermined position system is equipped with the first riveted holes,And lower tool apron is then equipped with the second riveted holes,So that one rivet of outside wears group and bottom knife and lower tool apron is enable to reach fixed limit； The feature of this creation what this first,The all tapered kenel of second riveted holes system,And the cone cell kenel system of second riveted holes must be able to cooperate corresponding linking first riveted holes,With exclude this first,Segment difference between second riveted holes aperture,Enable rivet can be contradicted comprehensively when wearing group this first,The inner wall of second riveted holes,And wherein,When the space kenel what rivet of first riveted holes is worn group,System can enable rivet head be sunk in the first riveted holes completely； Thereby,So that when omitting the riveting of known bottom knife must first what perforating carry out the processing flow of reaming,So that cutter manufacture processing flow it is more convenient,Quickly,And when being worn group by what rivet system can contradict comprehensively this first,The inner wall of second riveted holes,Therefore the stability of bottom knife installing can be substantially improved,Further reach have both promotion processing convenience,Install the Practical Benefits such as stability and service life.一種割稻機之刀具改良結構，所述刀具係裝設於割稻機前側預定位置處，係包括有呈排列型態之多數上刀片及下刀片，其中該上、下刀片係分別固設於割稻機之上、下刀座，且使上刀片係疊置於下刀片上方；其中該下刀片預設位置處係穿設有第一鉚接孔，而下刀座則穿設有第二鉚接孔，以供外部一鉚釘穿組而使下刀片與下刀座能夠達成固定限位；本創作之特點在於該第一、第二鉚接孔係皆呈錐狀型態，且該第二鉚接孔之錐狀型態係必須能配合對應銜接該第一鉚接孔，以排除該第一、
