Device for grooving cardboard cuttings

A device for grooving cardboard cuttings (2), comprising:

• a rotationally driven, horizontally supported transport drum (11) having an outer surface;
• a plurality of spaced-apart endless belts (51) that revolve around rollers (54), and are partially looped around the transport drum (11) such that an inlet (14) and an outlet (15) for the cardboard cuttings are formed and the belts effectively convey the cardboard cuttings (2) by pressing the cardboard cuttings against the outer surface of the drum;
• and
• at least one groove cutting tool (72) positionable between the belts (51) on the outer surface of the transport drum (11) and including a knife receptacle (78) that carries at least one knife (71) which together define a groove aperture angle for grooving the cuttings;
• wherein
• said groove cutting tool (72) includes a curved guide (77) for the knife receptacle (78),
• said curved guide defines a curved surface to guide movement of the knife receptacle along a curved path to adjust the groove aperture angle, and
• said curved surface of the guide has a center of curvature (81) which lies at the transport drum surface;
• and
• wherein the curved surface of the guide (77) is a contact surface (77a) that extends along an arc and on which the knife receptacle (78) has a complementary contact surface for said guided movement that can be fixed with a clamp (79, 79a).