Method and apparatus for deskewing and side registering a sheet

Details Method and apparatus for deskewing and side registering a sheet Method and apparatus for deskewing and side registering a sheet

1991-11-25

1992-12-08

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

With means to align sheet

271227, 271250, B65H 702

Patent

active

051691400

ABSTRACT:
A method of deskewing and side registering a sheet is disclosed. The method includes the step of driving a sheet non-differentially in a process direction with a sheet driver, the sheet having an unknown magnitude of side-to-side misregistration and an unknown initial angle of skew. The method further includes the steps of measuring the initial angle of skew with an initial skew sensing mechanism and driving the sheet differentially with the sheet driver to compensate for the magnitude of side-to-side misregistration and thereby induce a registration angle of skew. Moreover, the method includes the steps of measuring the registration angle of skew with a registration skew sensing mechanism and summing the initial angle of skew and the registration angle of skew so as to determine an absolute angle of skew. The method additionally includes the step of driving the sheet differentially with the sheet driver to compensate for the absolute angle of skew so that the sheet is deskewed and one edge of the sheet is side registered. Also disclosed is an apparatus for deskewing and side registering a sheet having an unknown magnitude of side-to-side misregistration and an unknown initial angle of skew.

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