Patent ID: 8904742

Claim:
A process for operating an air jet spinning machine having at least one spinning station with a vortex chamber, wherein a fiber strand is fed in a spinning direction to the vortex chamber and receives a twist in the vortex chamber such that a twisted yarn is formed from the fiber strand in a spinning process and is withdrawn from the vortex chamber by a withdrawal device, the process comprising: monitoring the withdrawn yarn with a monitoring device downstream of the vortex chamber; upon detection of a yarn fault, interrupting the spinning process in a manner such that the yarn detaches from the fiber strand and forms a yarn end; subsequent to interruption of the spinning process, performing a piecing process with the yarn end by: with a first suction unit configured as a component of the spinning station, suctioning the yarn end in an area between an outlet opening of the vortex chamber and the withdrawal device; in the area of the first suction device, cutting a section of the yarn end containing the yarn fault with a cutting unit configured as a component of the spinning station; returning the yarn end to the vortex chamber in a direction opposite to the spinning direction with an airstream generated within the vortex chamber or within a withdrawal channel of a yarn forming element that projects into the vortex chamber; seizing the yarn end at an inlet opening of the vortex chamber and preparing the yarn end for attachment to an end section of the fiber strand; superimposing the prepared yarn end with the end section of the fiber strand and jointly drawing the superimposed yarn end and fiber strand back into the vortex chamber with the withdrawal device; and resuming the spinning process by continued feed of the fiber strand and withdrawal of the formed yarn from the vortex chamber.