Abstract: A stack of sheets, e.g. cardboard, with each sheet having lines of cut longitudinally and/or transversely. Apparatus for breaking the nicks connecting two edges of line of cut on the stacked sheets includes a first support and transport moving longitudinally and a first clamp thereabove for clamping the sheets, a first device for separating the clamped sheets along a transverse cut line. A second support and transport device moves the sheets thereat transversely until positioned so that the longitudinal line of cut is positioned so that the sheets may be clamped and the stacked sheets may be separated transversely along the longitudinal line of cut. A conveyor for shifting the sheet transversely to reposition the longitudinal line of cut for separation.

Abstract: This device for breaking the nicks connecting two edges of a line of cut of stacked sheets of cardboard (5) placed on horizontal support and transportation means (8, 9, 34a, 6, 30) for moving the said sheets in a longitudinal direction, comprises upper clamping means (21, 22, 32) for clamping the stacked sheets (5) against the said support means (8, 9, 34a), first means (35) for longitudinally moving apart the said support and transportation means (8, 9, 34a, 6, 30) and the said clamping means (21, 22, 23) on both sides of a transverse line of cut of the said stacked sheets, and second means for moving apart transversely a part of the said support and clamping means (8, 9, 21, 22) on both sides of a longitudinal line of cut. It further includes second horizontal support and transportation means for moving the said stacked sheets (5) in a transverse direction.