Abstract: Foward motion timing of Comber detaching roller is a important technology parameters to adjust quality of separation and joint. Too early or late of foward motion timing of detaching roller will lead to a bad effect on the evenness of outputting cotton web. On the HC500 comber, weight distribution of fiber in different sections and its effect on the evenness of cotton web are analyzed according to the changing characteristics of speed curve of detaching roller and nipper in the process of Separation and joint. When the technologies of feeding and separation gauge are constant, weight distribution curve of fiber bundle at different clockwise rotation are achieved by the method of 2 mm cutting-weighing and the 2 mm weight CV% of cotton-web at diffrernt foward motion timing are calculated according to the regularity of separation and joint. The results show that the joint quality of fiber bundle and the evenness of outputting cotton-web are decided for the form of weight distribution curve of fiber bundle. 2 mm weight CV% of cotton web is the lowest when foward motion timing is 15.5 index under the condition of fiber length is 29mm, noil gauge is 9.5mm and feeding length is 5.2mm.

Key words: comber, forward motion timing of detaching roller, separation and joint, cotton-web weight CV