EE WAS PERFORMING MAINTENANCE WORK ON A BELT DRIVE TAKE UP UNIT. HE WAS CLIMBING OFF THE TAKE UP WHEN HIS FOOT CAUGHT IN THE STRUCTURE & HE FELL. HIS FOOT WAS TWISTED WHEN HE FELL BECAUSE IT R EMAINED CAUGHT IN STRUCTURE. THERE WAS NO DAMAGEOR IMPAIRMENT TO ANY EQUIPMENT OR TO THE OPERATION. EE DID NOT MAINTAIN SOLID FOOTING WHILE CLIMBING DOWN. NO OTHER FACTORS INVOLVED.