A seven-bar mechanism with double servo drive is proposed to meet the requirement of actuator high-speed reciprocating linear motion in a food packaging machinery.By kinematics calculation

the mechanism Jacoby matrix is obtained and its singularity and mobility characteristics are analyzed.The mechanism is classified through the presence of crank and the mechanism work space of typical drive mode is got.Aiming at one of the typical drive mode

one approach is proposed to measure the dynamic trajectory straightness effectively.By using genetic algorithm

the multi-objective nested optimization is carried out

a set of parameters to meet the requirement of the organization are got.Example demonstrates the using of this method can realize the high-speed reciprocating linear motion familiarly.