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導繩螺母切成5kuai，youlianjiegangdaihedaoshengbanlianchengyiti，gangsishengcongdaoshengbanchangxingcaoneishenchu。daoshengluomuyujuantongshengcaoniehe，juantongzhuandongqudongdaoshengluomuhengxiangyidong，yicibaozhenggangsishengzaijuantongshengcaozhongbuzhiluankou。
導dao繩sheng板ban向xiang卷juan筒tong兩liang端duan橫heng向xiang移yi動dong，當dang達da到dao極ji限xian位wei置zhi時shi，帶dai動dong安an裝zhuang在zai卷juan筒tong外wai殼ke上shang的de限xian們men杆gan一yi齊qi移yi動dong，到dao達da極ji限xian位wei置zhi觸chu動dong安an裝zhuang在zai主zhu電dian機ji上shang的de限xian位wei開kai關guan而er起qi限xian位wei作zuo用yong。