the interior thread balloon 30 is unaffected by the air flowing through the container 14 even in situations where the main drive motor for driving the twisting spindles is not cooled by exhaust air the illustrated exhaust channel 20 carries off 50 to 60 of the heat generated by the machine in some cases it may be advantageous to modify the exhaust channel 20 in such a manner that the drive spindles 11 do not extend into it over its entire length but rather that the central exhaust channel is so located in or outside of the machine for example on the floor of the machine room that there is a tapped off tube leading from each shroud 15 to the exhaust channel 20 each of these tubes can be attached at the bottom of the associated shroud 15 an exemplary embodiment of this type is shown in dash dot lines in fig1 the central exhaust channel in that embodiment is designated with the numeral 20 39 a separate tube 20 34 leads from each twisting station 10 to the central exhaust channel 20 39 each tube 20 34 is penetrated by the drive spindle 11 so that all the whorls 23 and the tangential belt 24 common to all twisting stations lies outside of the exhaust channel 20 39 and of the tubes 20 34 the individual twisting stations experience the same high.