Rotary cutting knife mounting
AssigneePhilip Morris Incorporated
InventorAndrew J. Gillespie
Life of this patent
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Abstract
The knives of a rotary cutter assembly are mounted on a centrally disposed pivot and elastic means are used to apply bias force to the knife ends to normally maintain the cutting edges of the knives substantially parallel with the axis about which the rotary cutter assembly rotates, the mounting being such to allow the knives to pivot when contacting the surface of a rotary drum against which they operate to assure that the cutting edges are parallel to the drum surface during the actual cutting through of a material web passing in a winding course on the drum. Additionally, means for adjusting the radial positioning of the pivots relatively of the said cutter assembly axis of rotation are included and means for locking the pivots in a particular position are also included.
Claims9
Improved apparatus for sectioning a continuous web of the type having:
- a rotary drum over which the web passes in a winding course thereon, and
- a rotary cutter assembly including a housing and a plurality of cutting knives carried in said housing, the rotary drum and the cutter assembly being rotatable about parallel axes, the knives on said cutter assembly being elongated and having cutting edges thereof which are disposed parallel to said axes of rotation, said cutting edges being brought into contact with the surface of said rotary drum to effect sectioning of said web thereon during rotation of said rotary drum and said cutter assembly, wherein the improvement comprises:
- pivots carried in said housing in a number corresponding to the number of cutting knives in the plurality, each knife being received on an associated one of said pivots, and
- elastic means engaged with the ends of each such knife and normally applying bias directed radially inwardly of said cutter assembly to each such knife to maintain the cutting edge thereof parallel to said fixed axes and to urge each such knife against the associated pivot.
Dependencies are inferred from the claim text.