EE WAS ASSISTING WITH BELT REPAIRS. A BELT WAS BEING PULLED BACK ONTO THE CONVEYOR FRAME. THE BELT CABLE GOT HUNG ON THE BELT SCRAPER SO THE INJ EE WENT UNDER THE DRIVE BELT GUARD & BEGAN PULLING ON THE VBELTS-ONCE HE PULLED ON THE BELTS THE CABLE THRU THE BELT SCRAPER & THE SHEAVE MOVED. THE EE'S HANDS WERE PULLED THRU THE SHEAVE.