Abstract: The automatic dense end location monitoring system in YJ19 cigarette maker exists"skip"and "dwell"phenomena, which affects the reliability of the system and results in high rate of loose end cigarettes and low accuracy of cigarette weight control. In light of the principle of velocity compensation, the original adjusting device was improved by using a planet gear differential mechanism as its transmission mechanism. The results of application showed that:after improvement, the qualified rate of weight difference between cigarettes of inside and outside rows increased by 23.6 percentage points, the rate of loose end cigarette decreased by 0.3 percentage points, the amount of cut tobacco loss from cigarette end reduced by 1.84 mg/cig., and the precision and stability of the control system were effectively improved.