An eccentric shaft rotated by a gear and pinion produces the oscillating movement of the main shaft. the eccentricity causes the cone head to oscillate between the open side setting (o.s.s.) and closed side setting (c.s.s.). in addition to c.s.s., eccentricity is one of the major factors that determine the capacity of gyratory and cone crushers. the fragmentation of the material results from the continuous.Apr 23, a live shaft crusher in the trio tc cone crusher (see figure 1), both the shaft and the head are moved in unison eccentrically during operation. this proven design can be traced back to the original cone crushers invented in the s, and a century of optimisation later, it’s one of the most reliable crushers in operation.