Device for forming a groove

A device for forming a groove in a cover, comprising:

• a circular score anvil having a first axis and being rotatable in a first direction;
• and
• a circular scoring knife having a second axis positioned parallel to the first axis and arranged radially opposite the score anvil to define a gap between the score anvil and the scoring knife, the scoring knife being rotatable in a second direction opposite to the first direction and comprising a scoring element having an edge region and two knife parts including knife edges in the edge region,
• wherein the edge region includes an intermediate space that divides the edge region into two spaced apart knife edges, the edge region being tapered to form a ridge toward a periphery of the scoring element,
• wherein at least one knife part is axially displaceable relative to the other knife part to define the intermediate space in the edge region between the knife edges that is variable from 0.2 mm to 1.0 mm;
• wherein the score anvil includes a flexible element along a periphery facing the scoring knife to cooperate with the knife edges;
• and
• wherein the cover is supported during a scoring operation by the flexible element.