the area of inner annular disc c is four times as large as that of the intermediate annular rings the area of outer annular disc a is twice that of an intermediate annular disc when the coil from guide 9 is being wound in this prevents the last turn from falling off although mathematically the area of the outer annular disc may be equal to the area of an intermediate annular disc as best shown in fig3 starting from inner annular disc c the height of all following annular discs increases by a few millimeters the inner edges of intermediate annular discs b1 b7 and outer annular disc a have a fold like configuration so that each annular disc covers the space between it and the adjacent inner disc and also the edge thereof fig1 6 and 9 this design prevents a turn of the film from falling and becoming jammed between the annular discs all of the annular discs are mounted upon disc wheels 10 fig3 depending upon the particular annular discs with which they are associated the disc wheels differ in diameter and are arranged suitably spaced apart upon axles 11 axles 11 common to the disc wheels mounted by means of bearings 12 secured on the four arms of cruciform holder 4 fig3 each annular disc has on its underside an annular groove 13 shown more clearly in fig6 except annular disc c which because of its greater width has.