Qhov cuab yeej rooj zaum yog qhov chav kawm tseem ceeb uas tsim los ntawm cov khoom siv ntau thiab yooj yim. Qhov kev pab tseem ceeb ntawm nws yog los nrhiav cov khoom siv hauv daim duab xwm fab—xwm fab plastic, kab, kab ntim, lossis kab ntim—and nrhiav nws zoo li cas los ntawm qhov chaw ntim, qhov chaw ntim, lossis qhov chaw ntim. Cov khoom siv tseem ceeb ntawm qhov cuab yeej rooj zaum muaj feem ntau, qhov chaw ntim rooj zaum los nruab qhov chaw ntim, qhov chaw ntim motor, thiab qhov chaw ntim (xwm fab) los txhim kho qhov khoom siv nyob rau hauv qhov chaw ntim. Qhov kev pab tseem ceeb ntawm qhov cuab yeej rooj zaum yog kev coj qhov tension thiab qhov kev txhim kho. Qhov tension yog kev coj los ntawm ntau yam kev coj, los ntawm qhov brake friction tsuag mus rau qhov clutch electromagnetic lossis qhov system servo closed-loop, uas tseem ceeb heev los tiv thaiv kev txhim kho lossis kev hloov qhov khoom siv. Qhov kev txhim kho, uas tau los ntawm qhov chaw ntim, tuaj yeem yog random (tsim qhov coil tsis zoo li cas) lossis precision (tsim qhov coil zoo li cas, zoo li cas rau kev tshuam). Qhov cuab yeej rooj zaum yog qhov yooj yim thiab tuaj yeem pom ntau qhov chaw, xwm fab vertical, horizontal, single-spindle, lossis multi-spindle. Nyob rau hauv qhov kev tsim khoom siv plastic profile extrusion, qhov cuab yeej rooj zaum zoo li cas yog tseem ceeb los pab nrog cov khoom siv xwm fab EPDM seals, PVC trims, lossis flexible thermal barrier strips, kom nws tsis muaj kinks, twists, lossis compression uas tuaj yeem hloov qhov cross-section. Los ntawm kev tsim qhov coil zoo li cas, qhov cuab yeej rooj zaum pab tiv thaiv qhov khoom siv, pab kev nruab tseg thiab kev nruab tseg, thiab pab kev pab tseem ceeb, ua rau nws yog qhov tseem ceeb rau kev tsim khoom siv rau cov khoom siv ntau thiab yooj yim.