Abstract: In KTC80 tobacco cutter with domestic parts for compression bands,the slat in the top band tended to be pulled off or broken.It was found that it was caused mainly by uneven force as the band was in bias travelling.Basing on three-dimensional load model analysis,a kit for centering top band was designed.The bands were automatically centered when they passed by the centering kit,and the rolling contact between the band and roller reduced band wear and ensured band's normal running.The results of nine months' running indicated that the number of band failure reduced from four times to once,the number of replaced slats decreased from 280 to 70 and average wear of slat reduced from 4.5 mm to 0.8 mm.