13 the only significant fact is the production of a closed drive and not the number of wheel discs 12 and 13 of this drive it is quite conceivable to operate instead of with only two wheel discs as in the embodiment with a drive which includes four wheel discs in which then each wheel disc causes a turn of only about 90 u00b0 such a structural configuration of the manufacturing apparatus may be advantageous for reasons of friction now the drive of wheel disc 12 is turned on in the direction of arrow 14 this causes a twisted strand of yarn 8 formed from filaments 7 drawn from bobbin table 1 to be pulled through the pushed together length sections 3 and 4 of the future protective tube 5 each full revolution of knot 23 indicates that a further strand of yarn has been pulled through the two pushed together length sections 3 and 4 of the future protective tube 5 consequently the number of revolutions of knot 23 corresponds to the number of turns of yarn 8 in the future skein of yarn 2 to be disposed within the two length sections 3 and 4 after the desired number of revolutions of knot 23 has been reached the drive for wheel disc 12 is turned off which may be effected by means of an automatic control device then the rear end 26 of strand of yarn 8 is cut from the intake side of filaments 7 thereafter the skein 2 composed of a plurality of wound strands of yarn is removed from wheel discs 12 and 13 supporting elements 11 are.