fig1 illustrates the essential elements of a winding drum in the form of a slit drum 1 in the simplest embodiment . the slit drum 1 comprises two separate end pieces 2 and a separate middle or central piece 3 . the end pieces 2 are formed alike . the end pieces 2 and the middle piece 3 each have a thin outer wall and are fixed on a common drum shaft 4 and thus positioned with respect to each other as illustrated . the rims or edges of the walls between one end piece 2 and the middle piece 3 and the other end piece 2 facing each other form a continuous helical slit 5 extending in the shape of a lying eight screwlike over the circumference of the slit drum 1 . the slit drum 1 or its parts 2 or 3 have a relatively small wall thickness . the slit 5 is open in radial direction , i . e . there is no bottom of the slit contrary to grooved drums containing a groove with a bottom . the slit 5 provides a crossing point 6 and two reversing points 7 . the run on the slit 5 is crossing in the crossing point 6 . the traversing direction 8 , which is illustrated by a double headed arrow parallel to the axis of the shaft 4 , changes in the reversing points 7 . the traversing width 9 is determined by the distance between the two reversing points 7 . the embodiment of fig1 illustrates the combination of two end pieces 2 and one middle piece 3 generating one crossing point 6 . it goes without saying that to extend the traversing width 9 two end pieces 2 can be combined with two middle piece 3 . in this case the middle pieces 3 are also alike , at least with respect to the run of its edges forming the slit 5 . they are positioned on the shaft 4 twisted by 180 ° to each other . using two middle pieces 3 generates two crossing points 6 . this system may be expanded . the number of the crossing points 6 always is equal to the number of the middle pieces 3 . thus , a slit drum consisting of three parts has one crossing point , a slit drum consisting of four parts has two crossing points etc . fig2 shows a schematic top view of the slit drum of fig1 turned by 90 ° so that the crossing point 6 of the slit 5 can be seen in the middle of the drawing . an auxiliary apparatus or crossover guide 10 is allocated to the slit drum 1 . the auxiliary apparatus 10 has no traversing function with respect to the traversing of the winding material on the bobbin , but has the purpose to maintain the traversing direction 8 of the winding material while running over the crossing point 6 . the auxiliary apparatus 10 here is located outside of the slit drum 1 and thus positioned upstream . a winding material 11 ( thread ) shown in a dotted line is fed according arrow 12 and runs first to the auxiliary apparatus 10 and then to an always changing entering point 13 of the slit 5 , then through a certain portion of the interior of the slit drum 1 , and finally leaves the slit drum 1 at an outgoing point 14 always changing with the turns of the slit drum 1 . a contact roller 15 is allocated to the outer circumference the slit drum 1 but with a distance to it ( fig3 ). the winding material 11 finally runs to a winding device 16 comprising a not illustrated drive and a tube 17 for taking up winding material 11 on the bobbin 18 . essential parts of the auxiliary apparatus 10 are illustrated in fig2 and 3 . the auxiliary apparatus 10 comprises a guide shaft 19 carrying a cylindrical sleeve 20 . the sleeve 20 provides two transversing elements 21 and 22 on its circumference , which are designed as arms or bows , each arm or bow having a straight segment and a curved segment . the traversing elements 21 and 22 are fixed on the sleeve 20 and are driven in rotation by the shaft 19 . the one traversing element 21 is allocated to one transversing direction and the other traversing element 22 is allocated to the other traversing direction . the traversing elements 21 and 22 are located on the sleeve 20 in an angle of 180 ° to each other with respect to the axis of the shaft 19 . each of the traversing elements 21 and 22 serves to add an additional motion to the winding material while running over the crossing point 6 in fact directed into the corresponding traversing direction 8 . this additional motion garantees the run of the winding material over the crossing point without changing the traversing direction . the traversing of the winding material 11 on the bobbin 18 is obtained only by the slit 5 , actually within the determined traversing triangle 23 between a fixed point , over which the winding material is fed , and the reversing points 7 . the auxiliary apparatus 10 only has the function to pass the crossing point 6 without changing the traversing direction . it touches the winding material 11 at this point in the direction of the desired motion . since the auxiliary apparatus 10 carries two traversing elements 21 and 22 , the shaft 19 has to be driven with half the number of revolutions compared to the shaft 4 of the slit drum 1 . of course this could be achieved by two separate drives only connected to each other by control means . fig3 illustrates a gear 24 consisting of a pinion 25 on the shaft 4 of the slit drum 1 , a driven pulley 26 on the shaft 19 of the auxiliary apparatus 10 , and a toothed belt 27 connecting the pinion and the driven pulley . the drive of the auxiliary apparatus is derived from the drive of the slit drum 1 and locked to it , so that the radial position of the traversing elements 21 and 22 is allocated with respect to the crossing point 6 . neither the slit drum 1 nor the auxiliary apparatus 10 provide any parts moving back an forth , so that the oscillating mass is determined only by the portion of the winding material 11 between the fixed point of the traversing triangle and the take up point on the bobbin 18 . fig4 and 5 illustrate a further embodiment of the auxiliary apparatus 10 &# 39 ; also located outside the slit drum 1 . essential parts of the auxiliary apparatus 10 &# 39 ; are two guide shafts 19 &# 39 ; and 28 arranged concentrically , with one traversing element 21 &# 39 ; connected with the shaft 19 &# 39 ; and the other traversing element 22 &# 39 ; connected with the shaft 28 . the shafts 19 &# 39 ; and 28 are driven in directions opposite to each other , so that also the traversing elements 21 &# 39 ; and 22 &# 39 ; are driven in different directions according to the arrows 29 and 30 ( fig5 ). for this purpose a reverse gear 31 is provided , which is driven via a shaft 32 and two gear wheels 33 and 34 . here also the drive of the auxiliary apparatus 10 &# 39 ; is locked to the drive of the shaft 4 of the slit drum 1 . the traversing elements 21 &# 39 ; and 22 &# 39 ; are driven with half the number of revolutions . it can be seen , that the traversing element 21 &# 39 ; is allocated to one traversing direction and the other traversing element 22 &# 39 ; is allocated to the other traversing direction , so that the crossing point 6 is passed alternatively by the winding material without changing the traversing direction at this point . in the crossing point 6 the rims 35 and 36 shaped correspondingly create a motion to the winding material 11 directed to the left or the right , so that the winding material 11 passes the crossing point 6 in the desired direction . fig6 and 7 illustrate a further embodiment of the device with the peculiarity that the auxiliary apparatus 10 &# 34 ; is positioned in the interior of the slit drum 1 . the slit drum 1 here also consists of the two end pieces 2 and the one middle piece 3 . the auxiliary apparatus 10 &# 34 ; comprises a sleeve 20 &# 39 ; designed as an inner drum carrying the traversing elements 21 &# 34 ; and 22 &# 34 ; its outer circumference with respect to the crossing point 6 of the slit 5 . the sleeve 20 &# 39 ; is pivotably arranged on the shaft 4 of the slit drum 1 via two ball bearings 37 and 38 . a reduction gear 39 is provided between the shaft 4 and the sleeve 20 &# 39 ; consisting of a sun wheel 40 , two planet wheels 41 and 42 , a driving wheel 43 , and a weight 44 . the sun wheel 40 is fixly arranged on the shaft 4 of the slit drum 1 and thus is driven in rotation corresponding to the revolutions of the shaft 4 . the weight 44 is pivotably arranged on the shaft 4 via a ball bearing 45 . the weight 44 stands still and is never rotated . it hangs on the rotating shaft 4 and forms the location of the axes of the two planet wheels 41 and 42 . the planet gear 41 meshes with the sun gear 40 , while on the other hand the planet wheel 42 meshes with the planet wheel 41 for reversing the direction of revolutions . the planet wheel 42 finally drives the driven wheel 43 , which is fixly arranged on the sleeve 20 &# 39 ; of the auxiliary apparatus . the transmission to half of the number of revolutions is obtained by according geometrical design . the sleeve 20 &# 39 ; with the two traversing elements 21 and 22 &# 34 ; is driven with half the number of revolutions compared with the number of revolutions of the shaft 4 . the rotating direction of the shaft 4 and thus of the circumference of the slit drum 1 is equal to the rotationg direction of the sleeve 20 &# 39 ; of the auxiliary apparatus 10 &# 34 ;, in fact in the direction determined by the arrow 12 of the winding material 11 . a further embodiment of the device is illustrated in fig8 . essential parts of the auxiliary apparatus 10 &# 39 ;&# 34 ; here also are located in the interior of the slit drum 1 , i . e . the sleeve 20 &# 34 ; and the two traversing elements 21 &# 39 ;&# 34 ; and 22 &# 39 ;&# 34 ;. the sleeve 20 &# 34 ; is pivotably arranged on the shaft 4 of the slit drum 1 via the two ball bearings 37 axed 38 . the shaft 4 is driven by an electrical motor 46 , the axis of which is in alignment with the axis of the shaft 4 . the drive for the auxiliary apparatus 10 &# 39 ;&# 34 ; and the elements needed for it are located outside the slit drum 1 . thus , a driving pulley 47 in the form of a gear wheel or a belt pulley is fixly arranged on the shaft 4 . the drive is transmitted to a driving pulley 48 arranged on the shaft 49 . a driving pulley 50 is positioned on the shaft 49 , meshing with a driving pulley 51 arranged pivotably on the shaft 4 via a ball bearing 52 . the design of the driving pulleys 47 to 51 is choosen in that way that the needed reduction in the number of revolutions of the auxiliary apparatus &# 39 ;&# 34 ; compared with the number of revolutions of the slit drum 1 is generated . in this case two traversing elements 21 &# 39 ;&# 34 ; and 22 &# 39 ;&# 34 ; are provided for the crossing point 6 , so that the sleeve 20 &# 34 ; of the auxiliary apparatus is driven with half the numbers of revolutions compared with the number of revolutions of the shaft 4 of the slit drum 1 . the transmission of the drive of the driving pulley 51 to the sleeve 20 &# 34 ; through the wall 53 is performed by the aid of a permanentmagnetic clutch , part one 54 of which is connected with the driving pulley 51 and the other part 55 of which is connected with the sleeve 20 &# 34 ; of the auxiliary apparatus 10 &# 39 ;&# 34 ;. ______________________________________ 1 - slitt drum 31 - reverse gear 2 - end piece 32 - shaft 3 - middle piece 33 - gear wheel 4 - shaft 34 - gear wheel 5 - slit 35 - rim 6 - crossing point 36 - rim 7 - reversing point 37 - ball bearing 8 - traversing direction 38 - ball bearing 9 - traversing width 39 - reduction gear10 - auxiliary apparatus 40 - sun wheel11 - winding material 41 - planet wheel12 - arrow 42 - planet wheel13 - entering point 43 - driven wheel14 - outgoing point 44 - weight15 - contact roller 45 - ball bearing16 - winding device 46 - electrical motor17 - tube 47 - driving pulley18 - bobbin 48 - driving pulley19 - shaft 49 - shaft20 - sleeve 50 - driving pulley21 - cross - winding element 51 - driving pulley22 - cross - winding element 52 - ball bearing23 - traversing triangle 53 - wall24 - gear 54 - part25 - pinion 55 - part26 - driven pulley27 - toothed belt28 - shaft29 - arrow30 - arrow______________________________________