Straight-Line and Rotary Systems Continuous-motion (rotary) machines do not index a container into a station and stop, but instead feed the container into a rotating turret,where the operational heads work on the moving container. Rotary machines require a timing screw on the conveyor feeding into the starwheel to separate the containers to the correct pitch. (Figure 18.2) The starwheel changes the direction of container flow and inserts the containers into the filling turret or back out onto the conveyor as the case may be.Straight-Line and Rotary Systems Continuous-motion (rotary) machines do not index a container into a station and stop, but instead feed the container into a rotating turret,where the operational heads work on the moving container. Rotary machines require a timing screw on the conveyor feeding into the starwheel to separate the containers to the correct pitch. (Figure 18.2) The starwheel changes the direction of container flow and inserts the containers into the filling turret or back out onto the conveyor as the case may be