A DEVICE FOR OBTAINING ONE OR MORE ENGRAVING LINES FOR FOLDING AND FORMING A BOX WITH A CARDBOARD SHEET

摘要

The present invention refers to a grooving device (1) comprising grooving means (7, 8, 10, 11) for realizing a grooving line on a sheet, said grooving means (7, 8, 10, 11) comprising: - A first (7) and a second (8) blade-holder support arranged one opposite the other in such a way as to allow the application of a first (10) and of a second blade (II), one facing the other according to a pre-determined penetration angle (tt) in the sheet, said first (7) and said second blade-holder support (8) being eliding in such a way as to allow a lowering/lifting of the blades that can be applied on them; - An operating device (4, 5, 6) for controlling the sliding of said first and second blade-holder support, said operating device comprising a piston (4) that alides in the grooving device (1) and a pair of fixing pins (5, 6), each one fixed on one part to a respective blade- holder support. In accordance with the invention, on the opposite part, said pins (5, 6) are maintained in contact in a sliding manner along a surface of the piston (4).