Abstract: To improve the lubrication of the second pusher in YB618 carton/overwrap packer and prevent lubricant from leaking, by analyzing the kinetic characteristics of the mechanism, the second pusher was improved with a mechanism of straight reciprocating motion based on epicyclical gear train and a fully sealed lubrication system. According to the transmission ratio of gears and the stroke of the mechanism, the kinematics of the second pusher was analyzed, and the improvement effect was validated by a Pro/E simulation model at an angular velocity of 80 r/min. The results showed that: 1) The straight reciprocating motion of the pushing hand in the second pusher was able to push cigarette packets into packing drum at low production speed. 2) The movement of the mechanism followed a cosine curve, it improved the performance of the equipment. 3) After running for 1200 hours, no lubricant leak was found, the second pusher was effectively lubricated, and the equipment ran well.