一(yi)個糾(jiu)偏(pian)(pian)(pian)裝置(zhi)系統基(ji)本上是一(yi)個位(wei)(wei)(wei)移傳感(gan)(gan)器(qi)檢測帶材位(wei)(wei)(wei)置(zhi)，并(bing)與(yu)給(gei)定量(liang)(liang)比較(jiao)，如　有偏(pian)(pian)(pian)移，則令執行機構去糾(jiu)正偏(pian)(pian)(pian)移直至在給(gei)定量(liang)(liang)要求(qiu)之(zhi)內。由(you)(you)(you)于(yu)中(zhong)心位(wei)(wei)(wei)置(zhi)的(de)(de)偏(pian)(pian)(pian)移難以(yi)測量(liang)(liang)，因此(ci)通常取　材料(liao)的(de)(de)邊(bian)緣位(wei)(wei)(wei)置(zhi)作為控制信號(hao)的(de)(de)基(ji)準。　所(suo)用(yong)試驗帶材為打印用(yong)卷(juan)筒(tong)紙，寬220mm，承(cheng)受張力(li)較(jiao)小，不允許(xu)出現折皺和(he)卷(juan)邊(bian)現象。帶材由(you)(you)(you)放(fang)卷(juan)輥1經(jing)過中(zhong)間導向輥3到(dao)收卷(juan)輥6，收卷(juan)輥由(you)(you)(you)直流(liu)電(dian)(dian)(dian)機7帶動，可(ke)無(wu)級(ji)調速。磁粉離(li)(li)合器(qi)2用(yong)作加載，使帶材具有一(yi)定的(de)(de)張力(li)，張力(li)大小由(you)(you)(you)施加給(gei)磁粉離(li)(li)合器(qi)的(de)(de)勵磁電(dian)(dian)(dian)流(liu)無(wu)級(ji)調節。帶材在傳輸中(zhong)的(de)(de)橫向偏(pian)(pian)(pian)移由(you)(you)(you)光電(dian)(dian)(dian)傳感(gan)(gan)器(qi)4檢　測，產生一(yi)個與(yu)偏(pian)(pian)(pian)移量(liang)(liang)成(cheng)比例的(de)(de)電(dian)(dian)(dian)信。