A slitting machine for threading scrap material has first and second arbors; and inner rotary knives and outer rotary knives disposed on each of the first and second arbors. A pair of rolls of fill material are positioned relative to the outer rotary knives. The rolls dispense fill material onto a strip of material so that the fill material is engaged by and cut by the outer knives as well as the strip portion overlaid by the fill material to be cut by the outer rotary knives.

A slitting machine for threading scrap material has first and second arbors; and inner rotary knives and outer rotary knives disposed on each of the first and second arbors. A pair of rolls of fill material are positioned relative to the outer rotary knives. The rolls dispense fill material onto a strip of material so that the fill material is engaged by and cut by the outer knives as well as the strip portion overlaid by the fill material to be cut by the outer rotary knives.

A slitting machine for threading scrap material has first and second arbors. A first set of rotary knives are disposed on each of the first and second arbors having a first diameter. A second set of rotary knives are disposed on each of the first and second arbors having a second diameter. The second diameter is smaller than the first diameter. As the arbor gap is closed, the first set of rotary knives cut edge trim and when the arbor gap is further closed, the second set of rotary knives cut mutts from the strip.

A slitting machine for threading scrap material includes first and second arbors; rotary knives disposed on each of the first and second arbors; and a pair of notching modules positioned on opposite ends of the first and second arbors. The notching modules each has a pair of shear knives for making multiple cuts in a strip of material passing through the slitting machine forming notches to enable threading of material to scrap chutes from the slitting machine.

A slitting machine for threading scrap material includes first and second arbors; rotary knives disposed on each of the first and second arbors; and a pair of notching modules positioned on opposite ends of the first and second arbors. The notching modules each has a pair of shear knives for making multiple cuts in a strip of material passing through the slitting machine forming notches to enable threading of material to scrap chutes from the slitting machine.

A separator disposing portion 15 is provided with a ball screw 22 and an arm 23. The arm 23 is a member which comes into contact with a holder 17 and a separator disk 18, thereby allowing them to move. The arm 23 is provided with a chuck portion 30 which is connected to a piston 29 and can be fitted to a chuck pedestal 27. The chuck portion 30 comes close to or moves away from an expansion/contraction shaft 16 in association with expansion and contraction of the piston 29. Further, the chuck portion 30 comes into contact with an outer circumference surface of the holder 17, a side surface of the holder 17 and a side surface of the separator disk 18 in association with movements of the piston 29 and a driving portion 26.

A separator disposing portion 15 is provided with a ball screw 22 and an arm 23. The arm 23 is a member which comes into contact with a holder 17 and a separator disk 18, thereby allowing them to move. The arm 23 is provided with a chuck portion 30 which is connected to a piston 29 and can be fitted to a chuck pedestal 27. The chuck portion 30 comes close to or moves away from an expansion/contraction shaft 16 in association with expansion and contraction of the piston 29. Further, the chuck portion 30 comes into contact with an outer circumference surface of the holder 17, a side surface of the holder 17 and a side surface of the separator disk 18 in association with movements of the piston 29 and a driving portion 26.

There is provided a cutting apparatus for cutting a multi-layered material sandwiched between a first tool and a second tool, including the first tool and the second tool are disposed such that blade portions of the first tool and the second tool face each other in a pressing direction, at least any one of the blade portions of the first tool and the second tool includes: an inclined portion including a tool inclined surface that is inclined with respect to the pressing direction; and a protruding portion including a vertical wall surface and a pressing surface and protruding from the inclined portion in the pressing direction, the vertical wall surface extending from the tool inclined surface along the pressing direction, the pressing surface being perpendicular to the vertical wall surface, and the inclined portion overlaps a tool facing the inclined portion as viewed in the pressing direction.

There is provided a cutting apparatus for cutting a multi-layered material sandwiched between a first tool and a second tool, including the first tool and the second tool are disposed such that blade portions of the first tool and the second tool face each other in a pressing direction, at least any one of the blade portions of the first tool and the second tool includes: an inclined portion including a tool inclined surface that is inclined with respect to the pressing direction; and a protruding portion including a vertical wall surface and a pressing surface and protruding from the inclined portion in the pressing direction, the vertical wall surface extending from the tool inclined surface along the pressing direction, the pressing surface being perpendicular to the vertical wall surface, and the inclined portion overlaps a tool facing the inclined portion as viewed in the pressing direction.

A manufacturing method of a metal strip coil for blades includes performing, on a steel band after a finishing cold rolling, a slit process that divides the steel band into a plurality of metal strips via joint operation of circular upper and lower blade cutters, and winding the metal strip into a coil shape after the slit process. In the slit process, a clearance of the upper and lower cutters is set within 5-25% of a metal strip thickness; an overlap amount of the upper and lower cutters is set within 5-80% of the metal strip thickness; and a clearance variation during the slit process is 30% or lower of the clearance. After the slit process, the metal strip is wound into a coil shape so that sag formed on an edge of the metal strip is positioned toward an axis center of a reel winding up the metal strip.