fig1 of the winders wid1 and wid2 and are carried to a forming press ep in the forming press ep each of the stator cores is again compressed to increase the accuracy of its axial dimension thus resulting in the completion of the stator core referring now to fig2 there is illustrated the first winder wid1 as shown in fig1 embodying the principles of the present invention also fig3 shows a cross sectional view of the first winder as taken along the line iii iii of fig1 combined with a side elevational view of a core discharge unit as viewed in the direction of the arrow iii 39 in fig2 only for the purpose of simplifying the description as above described the first and second winders wid1 and wid2 are of the same construction and one of them for example the first winder wid1 will now be described in detail with reference to fig2 and 3 the arrangement illustrated comprises an intermittently rotary member 102 in the form of a square hollow prism including closed opposite ends four longitudinal edges chamfered and a pair of opposite trunnions rigidly secured to the centers of the closed ends the rotary member 102 is supported through the trunnions by a pair of opposite upright pedestals extending from a horizontally disposed rectangular base 104 for the winder wid1 on the front and rear sides as viewed in fig2 the rotary member 102 is adapted to be intermittently rotated in the direction of the arrow a 39 shown.