A decoding apparatus is provided. The data storage space includes a first memory device operably storing location information for a selected user data set corresponding to one of the IO commands. The tachogenerator of the present invention has at least one coil parallel to the axis which is arranged on a second supporting device at an axial distance to the magnet elements. Other embodiments are also disclosed. Also, the improved apparatus enables the maintenance worker to pull out the part of the driving shaft that passes through the center of the turrets and die table, then pins are retracted, and with some related adjustments, that enables the die table to be removed from between the turrets.