parallel orientation with respect to the reserve cop 3 provides the advantage that the suction nozzle 33 will readily adapt for operation with cops of differing lengths and yarn build up formats without requiring any adaptive positioning of the nozzle 33 the suction body 32 of the yarn suction device 31 is affixed to the cop receiving receptacle 25 by a holder 81 shown in fig3 as will thus be understood the trough like receptacle 25 and the suction body 32 pivot as a common unit about the bearing 23 between the aforedescribed flat and inclined disposition of the receptacle 25 actuation of such pivoting movement is accomplished by a lever system 60 fig2 and 3 of the same design as disclosed in german offenlegungsschrift no de os 35 14 935 particularly an actuating rod 62 is arranged for reciprocal movement as indicated by the directional arrow 64 by which a lever 65 is pivoted about a stationary shaft 65a the lever 65 in turn actuating pivotal movement of another lever 66 through an intermediate connecting rod 63 the lever 66 pivots the cop receiving receptacle 25 about the axis 24 of its support bearing 23 fig1 for moving the reseve cop 3 from its position supported within the receptacle 25 in its flat cop receiving disposition.