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US 2004/0217539 A1Published application
Substrate bending stiffness measurement method and system
AssigneeXerox Corporation
InventorRobert A. Clark
Life of this patent
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AssigneeXerox Corporation
InventorRobert A. Clark
Estimating the term…
A method for measuring substrate bending stiffness and thereby basis weight on a real time basis. Provided is a corrugator having a plurality of parallel ribs, with one or more sheets of the substrate provided below the corrugator wherein a predetermined gap exists between a topmost sheet of the sheets and the corrugator. A vacuum is applied between the corrugator and the topmost sheet, wherein the vacuum is sufficiently large to raise the topmost sheet, thereby deflecting and bending it into a profile corresponding to the arrangement and size of the corrugator ribs and bending stiffness of the substrate. One or more sensors are provided for measuring the deflection of the topmost sheet. The vacuum, an air knife output and/or a fluffer output are then adjusted according to predetermined rules and the measured deflection.
A pneumatic sheet separating and feeding method including a sheet feedhead for separating and feeding the top sheet from a stack of print substrate sheets of variable sheet beam strengths by pneumatically forcing the top sheet against said sheet feedhead, wherein said sheet feedhead has a plurality of differentially spaced extending ribs of different rib extensions against which different deformation corrugation shapes of the top sheet are pneumatically formed depending on said variable sheet beam strength of the top sheet.
Dependencies are inferred from the claim text.