Rotary cutter for thin, flexible webs

Details Rotary cutter for thin, flexible webs Rotary cutter for thin, flexible webs

1983-04-15

1985-01-01

Schran, Donald R.

Cutting

Cutting motion of tool has component in direction of moving...

Orbital motion of cutting blade

83343, 83345, 83678, 83674, B23D 2512

Patent

active

044910452

ABSTRACT:
A rotary cutter or scissors for cutting a flexible web material as it travels around a rotating anvil roll. Mounted in the periphery of the anvil roll is an anvil blade having a cutting edge generally extending across the roll. Mounted in a fly knife roll rotating in synchronism with the anvil roll is a fly knife blade having a cutting edge that is also generally in axial alignment near the periphery of the fly knife roll. The axes of the anvil roll and the fly knife roll lie in the same plane and are spaced so that the locus of a cutting point on the fly knife blade intersects the locus of a corresponding cutting point on the anvil blade at two points, the first intersection point occurring as the cutting point on the fly knife blade is approaching the center of the anvil roll and the second intersection point occurring as the cutting point on the fly knife blade is traveling away from the center of the anvil roll. The anvil blade and the fly knife blade are mounted in their respective rolls so that the flexible web traveling on the surface of the anvil roll is cut through the cooperation of the cutting point on the fly knife blade with the corresponding cutting point on the anvil blade as the cutting point on the fly knife blade is traveling away from the center of the bed roll.

REFERENCES:
patent: 1398474 (1921-11-01), Strawn
patent: 2568333 (1951-09-01), Henschker
patent: 3000250 (1961-09-01), Altmann et al.
patent: 3086416 (1963-04-01), Minarik
patent: 3828636 (1974-08-01), Smith

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