Apparatus for the cross-perforation or cross-cutting of continuous material webs

An apparatus for the cross-perforation or cross-cutting of continuous material webs, comprising:

• a cylindrical knife holder that is rotatable about its longitudinal axis and has at least one groove that is open towards an outer peripheral surface of the knife holder and that extends in a direction of the longitudinal axis of the knife holder and in which a perforating or cutting knife is exchangeably inserted, a perforating or cutting edge of the perforating or cutting knife protruding radially outward of the outer peripheral surface of the knife holder,
• a releasable clamping device for including a clamping bar, the clamping device for clamping, via the clamping bar, the perforating or cutting knife in the groove,
• wherein the perforating or cutting knife is supported, at an end of the perforating or cutting knife opposite the perforating or cutting edge, on a stop member of an L-shaped stop element, the L-shaped stop element being disposed in the groove, and being adjustable in a radial direction of the knife holder once the clamping device is loosened, and
• wherein a portion of the L-shaped stop element is disposed on an opposite side of the perforating or cutting knife from the clamping device, and the clamping bar comprises a travel-limiting arrangement which cooperates with the stop member of the L-shaped stop element and limits movement of the L-shaped stop element radially outward,
• a spring arrangement disposed in the groove that acts on the L-shaped stop element,
• wherein a force of the spring arrangement moves the L-shaped stop element outwards in a direction away from a bottom of the groove once the clamping device is loosened.