Arrangement for the scoring of continuously transported, flat workpieces to be folded along scored lines

An arrangement for scoring continuously transported, flat workpieces to be folded along scored lines, in order to provide tubular pieces with prefold lines in a diagonal path and prepare folds of cross bottoms to be attached thereto, comprising:

• a pair of shafts that are parallel to each other,
• a pair of scoring rolls fastened to said shafts, each of said scoring rolls including a first segment and a second segment, the second segment of one of said scoring rolls including a helical groove and the second segment of the other of said scoring rolls including a helical ridge, the groove and the ridge engaging with each other in a contact region, the prefold lines having a length which is set by a group of tightly fitting segments forming each of the second segments and carrying the helical groove and the helical ridge, respectively, at least one segment of at least one of said groups of tightly fitting segments being retained on at least one of the pair of shafts in a pivoting manner and fixable on said at least one of the pair of shafts at different angles,
• characterized in that the first segment of each of said scoring rolls includes a cylindrical saucer-type segment retained on one of said shafts,
• one of the cylindrical saucer-type segments being provided with a ridge formed as a helix and the other cylindrical saucer-type segment being provided with a groove formed as a helix, said ridge formed as a helix and said groove formed as a helix engaging with each other in a contact region of external surfaces of the cylindrical saucer-type segments,
• a radial stay for connecting each of the cylindrical saucer-type segments to a hub fastened to one of the shafts, said cylindrical saucer-type segments protecting in axial directions and overlapping disks, connected to the shafts, upon which the respective group of tightly fitting segments are defined, and
• a tensioning device on each of the shafts composed of saucer springs, one side of each of the tensioning devices being supported by an annular collar of one of the shafts and the other side of each tensioning device being supported by movable bushings pushed onto the one of the shafts, said movable bushing in turn being supported by one of the groups of tightly fitting segments,
• each of the movable bushings being provided with an annular flange, engaged by one rocking arm mounted on a rolling frame, which is capable of moving one of the movable bushings towards the saucer springs.