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Paper machines are powerful, fast-moving, and very dangerous. To be safe when working around machines, you should understand some of the basic machine movements. Rotating motion, like that of rolls, drive shafts, and stock tank agitators. Reciprocating motion, including the back and forth or up and down movements of scanners, levers, drive pistons, and cylinders. And linear motion, or continuous straight line movement, including fabric and conveyor belt runs. If a machine or component can move, it can pose a hazard. Before you approach a moving machine, familiarize yourself with its range of movements and its hazards. In addition, stored energy could also be present. So, a good understanding of the equipment and process is critical to keeping yourself and others safe.