A method for realizing a blank for boxing one or more articles from a cardboard sheet for packaging, comprising following steps:
- arranging a conveyor for feeding a cardboard sheet for packaging according to an advancement direction (D);
- detecting dimensions of one or more articles to be boxed with a detector;
- arranging scoring means comprising:
- a first support which is arranged transversally to the advancement direction (D) and which is movable along a first direction (D1) parallel to the advancement direction (D) and which bears a first scoring tool and a second scoring tool, which are movable, mutually towards and away from one another, along the first support;
- a second support which is arranged transversally to the advancement direction (D) and which is movable along a second direction (D2) parallel to the advancement direction (D) and which bears a third scoring tool and a fourth scoring tool, which are movable, mutually towards and away from one another, along the second support;
- memorizing, using said detector, the dimensions of one or more articles to be boxed;
- on the basis of the dimensional values of the dimensions detected and memorized, the method comprises steps of:
- adjusting the distance, along the first support, between the first scoring tool and the second scoring tool so that, during the advancement of the cardboard sheet along the advancement direction (D), the first scoring tool realizes a first score line parallel to the advancement direction (D) and the second scoring tool realizes a second score line which is parallel to the first score line, so as to define, on the cardboard sheet:
- a central sector comprised between the first score line and the second score line;
- a first lateral sector comprised between the first score line and a first lateral edge of the cardboard sheet, which first lateral edge is parallel to the advancement direction;
- a second lateral sector comprised between the second score line and a second lateral edge of the cardboard sheet, which second lateral edge is parallel to the first lateral edge;
- moving the first support, relative to the cardboard sheet, along the first direction and, contemporaneously, moving the first scoring tool and the second scoring tool along the first support so that:
- the first scoring tool realizes, in the first lateral sector, a third score line between the first lateral edge of the cardboard sheet and the first score line, which third score line is oblique with respect to the advancement direction (D) and intersects the first score line in a first intersection point;
- the second scoring tool realizes, in the second lateral sector, a fourth score line between the second lateral edge of the cardboard sheet and the second score line, which fourth score line is oblique with respect to the advancement direction (D) and intersects the second score line in a second intersection point;
- moving the first scoring tool and the second scoring tool along the first support so that the first scoring tool and the second scoring tool realize a fifth score line which is transversal to the advancement direction (D) and which extends between the first lateral edge of the cardboard sheet and the second lateral edge of the cardboard sheet and which intersects the first score line at the first intersection point and the second score line at the second intersection point;
- moving the second support, relative to the cardboard sheet, along the second direction (D2) and, contemporaneously, moving the third scoring tool and the fourth scoring tool along the second support so that:
- the third scoring tool realizes, in the first lateral sector, a sixth score line between the first lateral edge of the cardboard sheet and the first score line, which sixth score line is oblique with respect to the advancement direction (D) and intersects the first score line in a third intersection point;
- the fourth scoring tool realizes, in the second lateral sector, a seventh score line between the second lateral edge of the cardboard sheet and the second score line, which seventh score line is oblique with respect to the advancement direction (D) and intersects the second score line in a fourth intersection point;
- moving the third scoring tool and the fourth scoring tool along the second support so that the third scoring tool and the fourth scoring tool realize an eighth score line which is transversal to the advancement direction (D) and which extends between the first lateral edge of the cardboard sheet and the second lateral edge of the cardboard sheet and which intersects the first score line at the third intersection point and the second score line at the fourth intersection point.