An employee was assisting with the changing of steel banding material on an automatic bander. Other employees completed their work and exited the fenced area. When the gate closed, the machine started moving a bundle of pipe down the rollerway where the injured employee stood, pushing him off his feet and pinning his left leg against the roller. This caused a laceration to the side and back of the left leg above the knee and a fracture to the right ankle requiring surgery and hospitalization.