On a fast‑moving body‑in‑white conveyor, the drive chain constantly shifts length as stations start and stop. The Demag chain storage unit is mounted just downstream of the main sprocket, where it gathers the slack that appears when the line slows and releases it when the line speeds up. By keeping the chain tension within a narrow band, the unit prevents the chain from jumping teeth or rattling against guides, which could misalign the car body fixtures. Operators notice smoother starts and stops, less wear on the drive sprocket, and fewer unexpected line halts. In a typical automotive plant the device runs 24 hours a day, exposed to oil mist and metal dust, yet it continues to feed the chain reliably, allowing the transfer line to maintain the precise positioning required for welding and assembly operations. Its simple mechanical design needs only occasional lubrication, keeping maintenance intervals short and production uptime high.