work station 1 of an open - end rotor spinning machine , as shown in fig1 has an open - end spinning device 2 and a winding device 3 . furthermore , as shown in fig2 a piecing member 16 , a yarn monitor 26 , and a yarn withdrawal device 27 are provided at each work station 1 . the pivotably seated piecing member 16 is arranged directly in front of the small yarn withdrawal tube 21 of the open - end spinning device 2 . the pivotably seated piecing member 16 prepares the yarn 9 for piecing that , for example , has been retrieved by the suction nozzle 4 from the cheese 8 after a yarn break . subsequently , the prepared yarn 9 is returned into the open - end spinning device 2 by the yarn withdrawal device 27 via the small yarn withdrawal tube 21 where it is pieced in a known manner to a rotating fiber ring . as is customary , the winding device 3 consists of a creel 22 for holding a cheese 8 , a drive drum 23 that is preferably driven by a separate motor , and a yarn cross - winding device 24 that is driven by a step motor ( not represented ). it is possible to arrange a yarn centering device in the form of a centering plate 17 in front of the yarn cross - winding device 24 such that it can be flipped into the regular travel path of the yarn when needed . work station 1 also has a suction nozzle 4 that is preferably pivotable by means of a step motor 6 between a yarn pick - up position i and a yarn transfer position ii , and the suction nozzle 4 has a yarn catch element 7 on its back . the yarn catch element 7 has an s - shaped yarn guide edge 13 , a yarn catch border 14 , and a shift plate 15 . a stationary yarn guide device 5 is arranged in the area in front of the regular yarn travel path . the stationary yarn guide device 5 has a yarn catch border 10 that is open at the bottom . the stationary yarn guide device 5 and the yarn catch element 7 arranged on the pivotably seated suction nozzle 4 make possible the dependable return of the yarn 9 , that had run up on the surface area of the cheese 8 after a yarn break and had been picked up there by the suction nozzle 4 , to the piecing member 16 , that is a part of the work station where the yarn 9 is prepared and kept ready for the restart of spinning at the respective work station 1 . as shown in fig6 and 7 , piecing member 20 is a part of the work station . the piecing member 20 takes up , prepares and keeps the auxiliary yarn presented by the suction nozzle 4 ready for the piecing process . the piecing member 20 substantially consists of a base body 141 , preferably produced by means of an injection molding or die casting process , that inter alia has a cylindrical shoulder 142 for receiving a spring element 137 . the pivot axis 135 of the piecing member 20 is also located in the area of this cylindrical shoulder 142 . at its end , the base body 141 has a connecting bore for fastening a detent 136 , while a receiving housing 143 for a small yarn opening tube 132 is arranged on the opposite side of the base body 141 . in this case , the receiving housing 143 for a small yarn opening tube 132 has a stepped through - bore 144 to which a vacuum connector 129 and a compressed air connector 138 are connected . furthermore , a quick - release coupling 155 can be arranged in the area of the compressed air connector 138 . in a known manner , the small yarn opening tube 132 fixed in place in the through - bore 144 has one or several tangential bores 145 through which a compressed air flow can be applied to the yarn end of the auxiliary yarn pneumatically fixed in the small yarn opening tube 132 , and the yarn twist can be opened in the process . as shown in fig7 the small yarn opening tube 132 is fixed in place in the through - bore 144 by means of an o - ring seal 146 or the like , as well as a cover plate 147 that can be screwed on . a seal 148 is provided on the opposite side of the through - bore 144 adjoining the open - end spinning device 2 . furthermore , a pneumatically actuable yarn cutting device 133 is arranged in the area of the piecing member 20 . a scissors 150 , or the like , is connected to a thrust - piston gear 149 that can be definitely controlled by means of a work station computer 125 . in the course of the spinning process , the yarn 9 produced in the open - end spinning device 2 is withdrawn by means of the yarn withdrawal device 27 and is wound into a cheese 8 on the winding device 3 . the surface area of the cheese 8 that is rotatably seated between the arms of a creel 22 rests on a drive drum 23 driven by a separate motor . it is driven by means of a frictional connection . in the process , the yarn 9 is , as is customary , placed by means of a cross - winding device 24 in such a way that it runs up on the surface of the cheese 8 in crossing layers . during this spinning process , the suction nozzle 4 is preferably positioned in a parked position v , which is indicated by dashed lines in fig3 . at this time the piecing member 16 is in its so - called spinning position represented in fig2 to 4 . if a yarn break occurs at one of the work stations 1 of the open - end rotor spinning machine and it is detected , for example , by the yarn monitor 26 or a yarn tension force sensor ( not represented ), the spinning device 2 is first switched off by the work station computer 25 of the respective work station 1 and a braking process is initiated at the associated winding device 3 . this means that , for example , the drive mechanism ( not represented ) of the drive drum 23 is charged with a braking current in the counter - winding direction and is thereby braked to a stop . in the process , the braking drive drum 23 also slows down the cheese 8 . simultaneously , the work station computer 25 triggers the step motor 6 in such a way that the suction nozzle 4 is pivoted out of its intermediate position ii into its yarn receiving position i , in that the aspirating opening 19 of the suction nozzle 4 is positioned in the immediate vicinity of the surface area of the cheese 8 . furthermore , the suction nozzle 4 is pneumatically connected with the vacuum source 12 by opening the valve 11 . subsequently , as indicated in fig2 the drive drum 23 is acted upon in the unwinding direction r in such a way that the yarn end that had run up on the surface area of the cheese 8 can be pneumatically picked up by the suction nozzle 4 . as is known in the art , the successful pickup of the yarn 9 can be either monitored by a sensor device arranged inside the suction nozzle 4 or by means of a yarn monitor 26 arranged in the area of the yarn travel path . thereafter , the step motor 6 pivots the suction nozzle 4 downward in the direction z until it has again reached the intermediate position ii . while the suction nozzle 4 is pivoted downward , it is additionally possible to flip a centering plate 17 that is installed in the area of the winding device 3 into the yarn path so that the yarn 9 is guided exactly in the center of the work station 1 by a yarn guide notch 18 in the centering plate 17 , and , for example , by a yarn guide notch 20 in the aspirating opening 19 of the suction nozzle 4 ( see fig1 ). in the course of downward pivoting of the suction nozzle 4 , the yarn strand stretched between the yarn guide notch 18 of the centering plate 17 and the yarn guide notch 20 of the suction nozzle 4 slides along the stationary yarn guide device 5 until the yarn 9 finally slips into the catch border 10 , that is open at the bottom of the yarn guide device 5 , as indicated in fig3 . at this time , the suction nozzle 4 has reached its intermediate position ii , as indicated in fig3 . in place of the centering plate 17 , it is also possible to provide a yarn centering device ( not represented ) that , for example , is comprised of an additional stationary guide wire and a special interior contour of the suction nozzle . subsequently , the suction nozzle 4 is again pivoted upward in the direction v as indicated in fig4 . in the course of this , the yarn 9 extending between the cheese 8 and the suction nozzle 4 forms a second yarn strand . this means that a first yarn strand 9 ′ extends between the centering plate 17 and the catch border 10 , while the second yarn strand 9 ″ extends between the catch border 10 and the aspirating opening 19 of the suction nozzle . in the course of upward pivoting of the suction nozzle 4 , the yarn catch element 7 is tangent to the yarn strand 9 ′ that glides along the yarn guide edge 13 of the yarn catch element 7 and extends exactly underneath the catch border 14 of the yarn catch element 7 when the suction nozzle 4 has reached its reversing direction iii . this means that with the yarn catch border 14 the suction nozzle 4 , that thereafter again pivots downward in the direction z , crosses the yarn strand 9 ′ and transfers the yarn 9 in the course of this to the piecing member 16 that is arranged in the area of the open - end spinning device 2 . in the course of this second downward movement of the suction nozzle 4 , the yarn 9 is inserted into the various yarn guide borders in the yarn travel path as well as into the opened yarn withdrawal device 27 . thereafter , the clamping roller 64 of the yarn withdrawal device 27 is closed again , and the yarn 9 is clamped . when the suction nozzle 4 pivots into the yarn transfer position iv , as indicated in fig5 the shift plate 15 arranged on the suction nozzle 4 moves against a corresponding detent of the pivotably seated piecing member 16 . in the process , the piecing member 16 is pivoted out of the spinning position indicated in fig2 to 4 into the yarn take - over position represented in fig5 in that its yarn outlet opening is positioned directly above the yarn strand 9 ′. the yarn 9 is now cut and the piecing member 16 that is pneumatically charged , takes over the yarn 9 . while the end of the yarn strand 9 ′ is prepared for the resumption of spinning by the open - end spinning device 2 in the piecing member 16 , the yarn strand 9 ″ is disposed of through the suction nozzle 4 . the suction nozzle 4 is then pivoted back into the parked position v by means of its drive mechanism 6 and in the process releases the piecing member 16 . acted upon by the spring element 37 , the piecing member 16 then rotates back into its spinning position . thereafter , the prepared yarn 9 is fed back into the open - end spinning device 2 by the yarn withdrawal device 27 via the small yarn withdrawal tube 21 and is placed there against a rotating fiber ring . subsequently , the new yarn 9 is withdrawn by means of the yarn withdrawal device 27 that is a part of the work station , and , as already mentioned at the outset , is wound into a cheese 8 on the winding device 3 . it will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application . many embodiments and adaptations of the present invention other than those herein described , as well as many variations , modifications and equivalent arrangements , will be apparent from or reasonably suggested by the present invention and the foregoing description thereof , without departing from the substance or scope of the present invention . accordingly , while the present invention has been described herein in detail in relation to its preferred embodiment , it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention . the foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments , adaptations , variations , modifications and equivalent arrangements , the present invention being limited only by the claims appended hereto and the equivalents thereof .