in fig6 the most essential of these elements are the suction nozzle 6 which sucks away the forward end of the roving and the pneumatic yarn holding device 8 with all devices which are associated therewith furthermore the control device 7 can be controllingly connected with the driving device 24 for the roving stopping device as is indicated schematically by a plug in connection 72 instead of the indicated plug in connection 72 or 710 for the valve 71 which is attributed to the torsion element 3 it is also possible to provide a different type of connection for example the piecing carriage 9 is constantly connected to the spinning machine via trailing cables not shown and is connected via an appropriate electric switch to each spinning station as it is being serviced as fig6 shows the control device 7 is controllably connected to a bobbin support and drive device 90 this device holds the bobbin 50 at a distance from the bobbin roll 51 during piecing and is turned back so that yarn 10 is fed back into the suction pipe 91 at the same time the bobbin support device and the bobbin drive device can also be elements which are independent of each other the swivelling drive not shown as well as the control valve 910 for the suction pipe 91 are also controllingly connected to the control device 7 in addition to the abovementioned elements a control valve 80 for the yarn holding device 8 and the drives 810 and 820 for the yarn brake 81 and the pre treatment equipment 82 are also connected to the control device 7 furthermore the torsion element 3 is moved in and out of the spinning position i under control of the control device 7 in.