Helical rotary drum shears
OwnerJohn R. Butainventor
Life of this patent
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Abstract
The present invention relates to a novel helical drum shear which is operable to cut a strip of material which moving at a first velocity. The cut is formed along a substantially straight line at a specific angle. The specific angle may be at an angle perpendicular to the feed direction thereby producing a squared cut. The helical drum shear comprises a means for cutting the material wherein the cutting means moves at a second velocity which is at a predetermined angle from the first velocity. The apparatus further comprises a means for moving the cutting means at a third velocity such that the combination of the second velocity and the third velocity is equivalent to the first velocity and the material is helically sheared along a substantially straight line oblique to the first velocity.
Claims16
An apparatus for cutting material moving at a first velocity comprising:
- a pair of drums rotating in opposite directions, each drum having a longitudinal axis positioned at a first angle from a line perpendicular to the first velocity while the material is being cut, such that a vector sum of the second velocity and the third velocity is substantially equal to a vector of the first velocity the first angle being an acute angle greater than zero;
- at least one cutting knife portion positioned on the periphery of each drum at a second angle to the longitudinal axis of the drum, the cutting knife portion of each drum positioned to helically shear the material when the pair of drums are rotating, the second angle being an acute angle greater than zero;
- wherein rotation of the drum causes each cutting knife to move with the drum at a second velocity tangential to the drum;
- and
- a means for moving the pair of drums at a third velocity while the material is being cut, the third velocity being transverse to the first velocity and the second velocity.
An apparatus for cutting material moving at a feed velocity comprising:
- a pair of drums rotating in opposite directions;
- at least one cutting knife mounted on each drum and moving with the drum at a tangential velocity, wherein each cutting knife is associated with a cutting knife on the other drum and positioned to helically shear the material when the pair of drums are oppositely rotating;
- wherein the tangential velocity is at a first angle transverse to the feed velocity such that the material is sheared at a second angle substantially perpendicular to the feed velocity;
- wherein the pair of drums are moveable along their longitudinal axis at a lateral velocity at least during the shearing of the material and a vector sum of the tangential velocity and the lateral velocity is substantially equal to a vector of the feed velocity.
Dependencies are inferred from the claim text.