我国古代收割农具,以推镰堪称机巧,而又最使人莫明其妙。据王祯《农书·农器图谱》所载,其柄为七尺之木,首端歧为两叉,中嵌镰刀;贯以横木,两端各穿小轮;用则执柄就地推去,以断禾茎云云(图1)。按图索骥,推镰作用颇似近世手推割麦机,然借普通镰刀和圆轮滚动,便能如图谱附诗所赞“推拥捷 Ancient harvesting tools in our country to push the sickle called tricky, but the most baffling. According to Wang Zhen, “Nong Shu Lun Nong Pu” contained, the handle is seven feet of wood, the first end of divergence forks, inlay sickle; Through to the cross, both ends of each piercing round; with the handle on the spot Push to cut off stems and so forth (Figure 1). According to the diagram, pushing the sickle quite similar to the recent world hand-cut wheat machine, then by ordinary scythe and wheel scroll,