cooperate during operation in each case with two stationary mating cutting units 54 54 u2032 54 u2033 54 u2032 u2033 56 56 u2032 56 u2033 56 u2032 u2033 as seen in the direction of rotation of the spindles each mating cutting unit 54 54 u2032 54 u2033 54 u2032 u2033 56 56 u2032 56 u2033 56 u2032 u2033 is preceded by a fiber exit unit 10 10 u2032 10 u2033 10 u2032 u2033 12 12 u2032 12 u2033 12 u2032 u2033 which is stationary during operation and in each case comprises a nozzle the fiber exit unit may also consist of a plurality of individual fiber feeds the converter comprises a drive unit 58 which is intended for driving four cutting bearing units 46 46 u2032 46 u2033 46 u2032 u2033 that are drivable in rotation the drive unit 58 has a toothed belt 60 which is coupled to gearwheels 62 62 u2032 62 u2033 62 u2032 u2033 coupled in each case to the spindles fig2 in order to ensure an advantageous engagement of the toothed belt 60 with the gearwheels 62 62 u2032 62 u2033 62 u2032 u2033 the converter has a deflecting roller 64 which is intended for deflecting the toothed belt 60 in order to enlarge a.