position on the spindle upper portions or blades 17 the full bobbins 18 are removed by the transporting belt 22 from the showing of fig2 it will be seen that the inclined position of the bobbin tubes 24 permits the distance between the guide element 21 or the transporting belt 22 respectively and the spindle rail 13 to be kept small and specifically in such a manner that in a zone which is important for the operation of the machine a saving in space is achieved furthermore the spindle rail 13 can be designed to possess a substantially u shaped cross section by virtue of which its mechanical stability is increased quite considerably the depicted inclination of the transporting belt 22 thus affords substantial advantages it presents however also a disadvantage if any of the bobbin tubes 24 for any reason e g due to wear no longer is accurately positioned by the bobbin holders 23 it may happen that due to the inclined position of the transporting belt 22 and thus the bobbin tubes 24 the latter are inclined towards the front somewhat too far with respect to the correct or prescribed angle of inclination and that one or another of the bobbin tubes during the bobbin tube exchange operation is no longer securely gripped by the elements 32 33 34 this is intended to be avoided with the inventive embodiment according to fig1 and 2 by the provision of the bar or rod 25 the rod.