Longitudinal cutting device for a winding machine

A longitudinal slitter for a web, the slitter comprising:

• a support shaft extending along an axis parallel to and below the web and transverse to a displacement direction of the web;
• a plurality of axially spaced circular disk-shaped upper blades above the shaft and each having a pair of parallel faces extending perpendicular to the axis;
• respective pairs of lower blades spaced axially on the shaft and rotatable about the axis with the blades of each pair flanking a respective one of the upper blades, each lower blade having an outer surface turned toward a respective face of the respective upper blade and forming a cutting edge engageable with the respective face of the respective upper blade and lying in a plane forming an acute angle with the axis the planes of each pair of lower blades diverging symmetrically in a cutting position downward away from the respective upper blade, the lower-blade cutting edges contacting the respective upper-blade faces along a line extending substantially parallel to the support-shaft axis;
• means for rotating the blades with the web between them and thereby cutting from the web with each upper blade a strip having a thickness equal to an axial spacing between the faces of the respective upper blade;
• and
• respective bearings carrying the lower blades on the shaft and defining blade planes parallel to the respective cutting edge planes.

A longitudinal slitter for a web, the slitter comprising:

• a support shaft extending along an axis parallel to and below the web and transverse to a displacement direction of the web;
• a plurality of axially spaced circular disk-shaped upper blades above the shaft and each having a pair of parallel faces extending perpendicular to the axis;
• respective pairs of lower blades spaced axially on the shaft and rotatable about the axis with the blades of each pair flanking a respective one of the upper blades, each lower blade having an outer surface turned toward a respective face of the respective upper blade and forming a cutting edge engageable with the respective face of the respective upper blade and lying in a plane forming an acute angle with the axis, the planes of each pair of lower blades diverging symmetrically in a cutting position downward away from the respective upper blade, the lower-blade cutting edges contacting the respective upper-blade faces along a line extending substantially parallel to the support-shaft axis, the lower blades having outer surfaces forming along the line a surface parallel to the axis;
• and
• means for rotating the blades with the web between them and thereby cutting from the web with each upper blade a strip having a thickness equal to an axial spacing between the faces of the respective upper blade.