storage drum it also has a plurality of yarn stop devices each having a blocking element which is adapted to be introduced into an annular gap between the storage drum and the ring upon actuation of the yarn stop device a withdrawing device for the blocking element which removes the blocking element from the gap after termination of the activation of the yarn stop device comprises a belt of resilient material application_number US 19251088 A description as can be seen in fig1 a yarn storage device 1 consists of a storage drum 2 surrounded by a ring 3 the angular position of the storage drum 2 relative to the ring 3 is determined by a permanent magnet means which is not shown by means of a winding device which is not shown the storage drum 2 can have applied thereto a temporary yarn supply t as shown in fig3 and 4 with the aid of which it is possible to balance intermittent yarn take up of a subsequent yarn consuming apparatus such as a weaving loom or a knitting machine the number of yarn windings w as withdrawn from the storage drum 2 is determined by an opto electronic detection means 4 consisting of a light emitting diode and a phototransistor upon being withdrawn form the storage drum 2 the yarn 7 is drawn through a gap 8 positioned between the storage drum 2 and the ring 3 several yarn stop devices each designated a 5 are provided in an equally spaced mode of arrangement in the circumferential direction of the storage drum and of the ring respectively each yarn stop device 5 consists of an electromagnet 5 which is adapted to be actuated by an electric control signal and of a yarn blocking.