Method and apparatus for the piecing of yarn

The subject of the invention is a method and an apparatus for the semi-automatic piecing of yarn in work units of a friction-spinning machine. The piecing process is carried out within preselected time intervals by means of a control unit (3a) having a change-over switch (29) connected to thread-break monitors (10) of the work units and, by means of setting members (4), to circuits of the drive means (33, 19, 20) of feeding, spinning and pick-up devices (5, 6, 17, 18) and to a vacuum source (16) in the friction-spinning machine. During the individual elimination of the thread break, the control unit having the change-over switch is connected via the thread-break monitor to the circuit of an electromagnetic coupling of the fibre supply and of an electromagnetic valve of the suction-pipe line and via the setting member to the circuit of the means for actuating the yarn take-up and/or yarn winding.