Stackable winding core having axial projections

Claim 1

A rotatable winding core for receiving a plurality of individual printed products, wound up together to form a tightly wound up roll of printed products, which comprises: a ring-shaped winding body defining an axis and a median plane extending at right angles with respect to said axis; a winding band provided for said rotatable winding core and, said winding band being wound in coils between coils of the wound-up printed products and said band being connected at one end with said winding body and being would on said winding body in the median plane thereof; said winding body having a central portion about which said winding band is would to support the coils of the winding band and a substantially cylindrical circumferential outer surface on each side of said central portion to support the tightly wound up roll of printed products; an inner peripheral web located in the inner periphery of central region of the winding body, said web running in a circumferential direction and protruding inwardly from the winding body in a radially inward direction; the outer surface of at least one end of said winding body having a plurality of recessed formed therein extending in the axial direction toward said central portion and defining a plurality of projections, the circumferential width of said recesses being greater than the circumferential width of said projections for receiving the projections of a neighboring winding core; wherein a plurality of winding cores are coaxially stacked one on top of the other in a tower-like manner, the projections of one winding core bearing against the central portion of an adjacent winding core when the winding cores are empty, and the end faces of the rolls of printed products bearing one against the other when the cores have wound up printed products wound thereon.