means not shown it is quite simple to limit the rotational movement of deflecting roller 16 to 180 u00b0 since modern warping machines run at approximately 600 meters per minute and about 0 3 seconds are required from stop signal to actual stop a certain amount of thread suitably about 3 4 meters will run over roller 16 and this provides sufficient time to turn the roller around 180 u00b0 thus there is no danger that the threads end up half and half across surface 24 25 deflecting roller 16 only has two permanent positions namely the running position of the at rest position that is to say there is no continuous adjusting of rotation involved as is shown in fig5 and 6 plurality of staggered deflecting rollers 16a through 16d may be supplied sequentially about which the thread sheet 3 is partially wrapped in order to obtain the desired warming of the thread sheet 3 each roller 16a 16d is constructed the same as deflecting roller 16 fig4 a when the arrangement is brought to a halt the several rollers 16a 16d must be brought from the operative position of fig5 to the at rest position of fig6 the mechanism for rotating each of the rollers 16a 16d is substantially as was shown in fig4 a referring to fig7 previously mentioned feed rollers 10 and 12 are heated and take off rollers 13 and 15 are cooled all of these rollers being hollow for this purpose a common heating fluid circuit 43 is contemplated in which a fluid which may be oil or water is circulated by means of pump 29 the circuit comprises a heating arrangement 30 providing a fluid flow through the internal space in rollers 10 and 12 accordingly pump 29 feeds.