A conveyor roller drive device is provided to mechanically prevent conveyed goods from falling down on a conveyor system. The auxiliary lens assembly is secured by a pair of arms having magnets at one end that co-operate with magnets provided on the spectacles. The system further includes an order analysis system coupled with the database. The encoder and decoder may use different scan patterns for different transform sizes when scanning values from two-dimensional blocks into one-dimensional arrays, or vice versa. The annealing step includes annealing the insulation layer using electromagnetic radiation emitted from a laser. The hollow profile is provided with side walls and transverse walls.