Lub pulley thaiv yog tsim los ntawm kev sib piv ob peb lub rubey ruaj khov thiab txav tau, uas tuaj yeem txuag kev siv zog thiab hloov cov kev taw qhia ntawm lub zog. Hauv kev siv, qhov nyiaj ntawm kev siv zog txuag thiab txoj kev winding ntawm txoj hlua yog nyob ntawm qhov cuam tshuam ntawm lub pulley thaiv. Lub hauv paus ntsiab lus ntawm txoj hlua winding yog: thaum tus naj npawb ntawm cov rub tawm ruaj khov thiab cov rub tau txav tau sib npaug, qhov kawg ntawm txoj hlua tuaj yeem tawm ntawm lub rub lub rub tawm lossis lub rub tawm ruaj khov, thiab thaum tawm ntawm lub rub tawm ruaj khov, qhov kawg ntawm qhov ruaj khov. txoj hlua yog dai rau ntawm lub rubey ruaj; driven pulley Thaum tawm los, qhov kawg ntawm txoj hlua khi yog dai rau ntawm lub pulley txav tau. Qhov sib txawv ntawm tus naj npawb ntawm cov rub tawm ruaj khov thiab txav tau yuav tsum tsis pub tshaj 1. Thaum tus naj npawb ntawm lawv tsis sib npaug, qhov kawg ntawm txoj hlua dawb tawm los ntawm ntau sab, thiab qhov kawg ntawm txoj hlua dai ntawm sab qis. . Thaum lub rubey txav tau ruaj khov, thaum txoj hlua ruaj ruaj yog dai rau ntawm lub rub tawm, lub rub lub rub tawm yog qhov siv zog tsawg dua li thaum txoj hlua ruaj ruaj yog dai rau ntawm txoj hlua ruaj khov (vim tias muaj ntau daim hlua rau dais qhov hnyav ntawm qhov khoom).
Cia n yog tus naj npawb ntawm cov hlua ntu uas nqa qhov hnyav ntawm cov khoom (piv txwv li, lub pulley teem rau sab laug n=5, thiab sab xis n=4), ces tus n{{ 2}} hlua hlua tuaj yeem nruab nrog n lossis n-1 pulleys. Thaum nruab nrog n lub log, tus naj npawb ntawm cov txav rub tawm thiab cov rub tawm ruaj khov sib npaug, thiab qhov kawg ntawm txoj hlua ruaj khov yog nyob rau ntawm lub rubey ruaj khov; Thaum n-1 rubeys tau nruab, n yog tus lej khib, thiab qhov kawg ntawm txoj hlua ruaj khov yog nyob rau ntawm lub zog rub.
Thaum siv lub rubey thaiv, ib qho khoom hnyav yog txhawb nqa los ntawm ob peb txoj hlua, thiab lub zog siv los nqa cov khoom yog ib feem ntawm qhov hnyav ntawm qhov khoom.
