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US 4,061,063 AGranted
Rotary shear
AssigneeThe Procter & Gamble Company
InventorJohn B. Brush
Life of this patent
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AssigneeThe Procter & Gamble Company
InventorJohn B. Brush
Estimating the term…
A high-speed rotary shear for making, in the direction of travel, straight cuts, curved cuts, and combinations thereof, through a continuously moving web of thin, pliable, compliant, cut-resistant material and a process of making such cuts. The shear comprises at least one pair of first and second cooperating blades located to either side of the web. Each of the first and second blades is mounted on a blade support affixed to a rotatable shaft. At least one of the first and second blades is in part at least elastically mounted on its support and is itself flexible. The axes of the shafts of said first and second blades lie in spaced horizontal planes and in vertical planes which intersect at an angle such that the first and second blades will be skewed with respect to each other at an angle of from about 1.degree. to about 6.degree. and such that the first and second blades, having the same outside diameter, will have a single point contact, cutting the web with a scissors action.
A rotary shear for making clean and complete cuts in a continuously moving web, said cuts being straight cuts parallel to the direction of movement of said web, straight cuts lying at an angle to the direction of movement of said web, curved cuts of combinations thereof, said shear comprising first and second rotatable shafts, a first blade support non-rotatively affixed on said first shaft, a first arcuate blade mounted on said first blade support, a second blade support non-rotatively affixed on said second shaft and a second arcuate blade mounted on said second blade support, one of said first and second blades being flexible and in part at least elastically mounted on its respective one of said first and second blade supports, said first and second blades comprising a cooperating pair of blades having cutting edges of equal length all points along which are spaced from the axis of their respective one of said first and second shafts by the same radial distance, said blade cutting edges being configured to make the desired cuts through said web, the axes of said first and second shafts lying in parallel horizontal planes so spaced and in vertical planes which intersect at an angle such that said first and second blades are skewed with respect to each other at an angle of from about 1.degree. to about 6.degree. and will have single point cutting contact throughout the length of their cutting edges, and means to rotate said shafts in timed relationship so that said first and second blades will properly coact.
A process of making clean and complete cuts in a continuously moving web of thin, pliable, compliant, cut-resistant material, said cuts being straight cuts parallel to the direction of movement of said web, straight cuts lying at an angle to the direction of movement of said web, curved cuts or combinations thereof, said process comprising the steps of providing first and second rotatable shafts, non-rotatively affixing to said first shaft a first blade support with a first arcuate blade mounted thereon, non-rotatively affixing to said second shaft a second blade support with a second arcuate blade mounted thereon, one of said first and second blades being resilient, mounting said one of said first and second blades in part at least elastically its respective one of said first and second blade supports, said first and second blades having cutting edges of equal length all points along which are spaced from the axis of their respective one of said first and second shafts by the same radial distance, configuring said cutting edges of said first and second blades to make the desired cuts through said web, so spacing and so angling said axis of said first and second shafts that said first and second blades are skewed with respect to each other at an angle of from about 1.degree. to about 6.degree. and will have single point cutting contact throughout the length of their cutting edges and rotating said first and second shafts in timed relationship so that said first and second blades properly coact.
Dependencies are inferred from the claim text.