Rotary web cutting apparatus

A rotary web cutting apparatus comprising

• A. supporting structure for machine parts,
• B. a knife cylinder,
• C. means for mounting at least one flexible and resilient knife assembly on the knife cylinder, each knife assembly including a pair of closely spaced knife blades for cutting transverse strips from a web,
• D. an anvil cylinder,
• E. means defining at least one anvil surface on the anvil cylinder,
• F. means for rotatively mounting the two cylinders parallel to one another on said structure so that they are spaced apart to form a nip between them,
• G. means for rotating the cylinders in opposite directions so that each knife blade passing through the nip interferes with an anvil surface simultaneously along its entire length, each said knife blade being relatively thin and positioned in its assembly so that is has appreciable free length adjacent its cutting edge and is canted relative to a line perpendicular to its anvil surface at the instant of its interference with that surface,
• H. means for setting the relative positions of each knife blade on its anvil surface so that the knife assembly is flexed at the instant of interference between the blade and anvil surface to bias the entire length of the blade edge toward that surface with sufficient local force to cut simultaneously the entire width of web trained between the blade and anvil surface,
• I. means for physically removing said strips from the vicinity of said blades, said removal means including a lengthwise series of projections mounted on one of said cylinders, said projections projecting through the plane defined by the cutting edges of the blade pair when the blade pair is in the nip between the two cylinders so that the projections impale web strips cut by said blade pair, and
• J. means mounted on said one cylindeer adjacent said projections for removing said strips from said projections at a location out of the nip between the two cylinders.

A rotary web cutting apparatus comprising

• A. supporting structure for machine parts,
• B. a knife cylinder,
• C. means for mounting at least one flexible and resilient knife assembly on the knife cylinder, each knife assembly including a pair of closely spaced knife blades for cutting transverse strips from a web,
• D. an anvil cylinder,
• E. means defining at least one anvil surface on the anvil cylinder,
• F. means for rotatively mounting the two cylinders parallel to one another on said structure so that they are spaced apart to form a nip between them,
• G. means for rotating the cylinders in opposite directions so that each knife blade passing through the nip interferes with an anvil surface simultaneously along its entire length, each said knife blade being relatively thin and positioned in its assembly so that is has appreciable free length adjacent its cutting edge and is canted relative to a line perpendicular to its anvil surface at the instant of its interference with that surface,
• H. means for setting the relative positions of each knife blade on its anvil surface so that the knife assembly is flexed at the instant of interference between the blade and anvil surface to bias the entire length of the blade edge toward that surface with sufficient local force to cut simultaneously the entire width of web trained between the blade and anvil surface,
• I. means for physically removing said strips from the vicinity of said blades, said removal means including a lengthwise series of projections mounted on one of said cylinders, said projections projecting through the plane defined by the cutting edges of the blade pair when the blade pair is in the nip between the two cylinders so that the projections impale web strips cut by said blade pair, and
• J. means mounted on said one cylinder adjacent said projections for removing said strips from said projections at a location out of the nip between the two cylinders.