Guide track for roller chain drives

A printing machine sheet delivery unit comprising:

• a sheet transfer chain for releasably receiving and transferring sheets, said chain including a plurality of laterally spaced rollers moveable in an endless path in a running direction, a pair of guide tracks each having a plurality of components mounted, said components of each track having a substantially flat running surface disposed in spaced parallel relation to a flat running surface of a component of the opposite track for guiding movement of the chain rollers between the tracks, said components each having upstream and downstream ends disposed in closely spaced apart relation to each other to form gaps in the flat running surfaces of the components which guide movements of the chain rollers, and said upstream and downstream ends of said components of each track having mating substantially concave and convex end faces respectively in relation to the running direction of the chain for defining a substantially chatter free transition joint between respective flat running surfaces of the components without any portions of said concave and convex end faces being overlying relation to each other.