Synthesising a Four-Bar Linkage for an Assembly Line Featuring Intermittent Drag Chain Motion

We developed a new assembly line design featuring intermittent drag chain motion by means of a drive comprising a four-bar linkage. We propose a method of calculating basic geometrical parameters of the device. We implemented the four-bar linkage system using a computer, making it possible to determine the following parameters of the mechanism: crank, coupler and rocker lengths; initial crank position; rocker configuration angle. We consider a method of selecting optimum mechanism parameters. The mechanism structure designed meets the following criteria: satisfying Grashofs crank existence condition, ensuring minimum loads in kinematic pairs and matching the rocker motion curve to the actual function of the mechanism. The author suggests two parameters for estimating the efficiency of the mechanism: payload increase coefficient and drag chain halt deviation factor

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