components 70 71 72 and 73 the spinning stations 100 are delimited on at least one side by intermediate walls 101 which support as essential components longitudinal components 102 and 103 to receive the component 70 containing the spinning rotor 20 an additional longitudinal component 104 which together with longitudinal component 102 supports the component 72 containing the rotor bearing 25 and a longitudinal component 105 which together with the longitudinal component 102 supports the component 71 containing the opener device 22 if the rotor cover 23 see fig2 is not installed on the component 71 containing the opener device the rotor cover is also supported via another component 73 by the longitudinal component 102 as shown in fig5 and 6 2 pairs of bolts 27 270 and 271 272 are provided for the component 70 the arms 40 and 41 of which can be moved to the maintenance unit 4 the component 72 with opener device 22 is provided with two pairs of bolts 273 and 274 or 275 and 276 with which the arms 47 or 470 supported and controlled by the maintenance unit 4 interact the component 72 containing the rotor bearing 25 is provided with two pairs of bolts 28 and 280 or 281 and 282 with which arms 471 or 472 can interact and which are also supported and controlled by the maintenance unit 4 drive arrangements 48 and 480 are located on the maintenance.