Abstract: A synchronous rotary cross cutter for cutting a material web of paper or the like has two drums which synchronously rotate about parallel axes at opposite sides of the material web, and a cutting element on each drum. One of the cutting elements is elastically yieldable, and the drum for this cutting element has a helical bearing surface with an axis lying on the cutting edge of the elastically yieldable cutting element. The helical surface of the drum has such an inclination that the free angles of the elastically yieldable cutting element at the beginning and at the end of the cutting line are identical.

Abstract: The upper reach of a first belt conveyor delivers a stream of partly overlapping sheets to one end of a perforated second belt conveyor whose lower reach is located above the open top of a magazine and below the perforated bottom wall of a suction chamber. The lower reach attracts the non-overlapped leaders of successive foremost sheets of the stream and transports them toward a position of register with the open top of the magazine. Timely separation of sheets which are attracted to the underside of the lower reach is insured by a non-foraminous slide which is installed between the suction chamber and the lower reach and is movable lengthwise of the lower reach to seal a selected number of perforations in the lower reach in the region of that side wall of the magazine which is remote from the first conveyor.