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Rotary sheeter

  • US 4,742,741 A
  • Filed: 04/07/1986
  • Issued: 05/10/1988
  • Est. Priority Date: 04/07/1986
  • Status: Expired due to Fees
First Claim
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1. In a method of cutting a continuously moving web of sheet material to provide severed sheet increments of selectable lengths, the steps ofproviding frame means for supporting a pair of elongate, generally cylindrical, rotatable roll assemblies lineally coextensively with one another and with fixed axes thereof parallel to each other,adjusting spatial separation of said roll assemblies with respect to each other to define limited passageway means therebetween for accommodating a web of sheet material moving freely therethrough,rotatably driving said roll assemblies in unison and at the same rotational velocity and each about a respective one of said fixed axes, but in opposite annular rotational modes as the web moves through the passageway means,mounting cutter rolls and slot rolls on said roll assemblies as an annular array thereon and within an encircling, bounding marginal zone of each of said roll assemblies,spacing said cutter rolls and said slot rolls equally and in an alternating sequence, and at equal radial distances from said axes of said assemblies,pivotally supporting said cutter rolls and said slot rolls for planetary revolution in a ferris-wheel fashion about the fixed axes of the roll assemblies as said roll assemblies rotate, andestablishing and maintaining fixed annular orientation of said cutter rolls and said slot rolls with respect to their own axes as the roll assemblies rotate,providing actuator means for pivotally arcuately displacing said cutter rolls and said slot rolls,periodically selectively energizing said actuator means for pivotally shifting said cutter rolls and said slot rolls simultaneously through equal circumferential arcs to establish a functional mode of said cutter rolls and cooperating said slot rolls,controlling sequential presentation of a knife blade of a cutter roll into an opposedly presented slot of a cooperating slot roll at opposed sides of the passageway as the web passes therethrough, severing the moving web into incremental lineal segments of selectable lengths during travel of said web through the passageway, and driving said roll assemblies at circumferential lineal speeds corresponding to a lineal speed of the web of sheet material moving through the passageway therebetween, thereby obviating any need for maintaining an accumulation loop in the moving web.

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