Method of sheet registration and a sheet stacker with a sheet re

Details Method of sheet registration and a sheet stacker with a sheet re Method of sheet registration and a sheet stacker with a sheet re

1996-07-05

1998-03-31

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

With means to align sheet

271270, 271315, 192395, 192456, B65H 702

Patent

active

057329435

ABSTRACT:
To compensate for sheet registration errors and to produce a desired target sheet offset between upstream and downstream positions of a sheet path along which sheets travel successively in a predetermined sheet travel direction, each sheet is driven along the path in at least three successive phases, i.e. a first phase in which the sheet is driven differentially to rotate the sheet in a first direction, a second phase in which the sheet s driven uniformly in the sheet travel direction, and a third phase in which the sheet is driven differentially with a driving velocity versus time profile opposite to that in the first phase, to rotate the sheet in a second direction opposite the first direction. If the sheet has a skew error, an intermediate phase in which the sheet is driven differentially with a driving velocity versus time profile dertmined to correct for the detected skew error, is nested in the second phase.

REFERENCES:
patent: 4971304 (1990-11-01), Lofthus
patent: 5078384 (1992-01-01), Moore
patent: 5169140 (1992-12-01), Wenthe
Patent Abstracts of Japan, Publication No. 07257799, Oct. 9, 1995, European Patent Office.
Patent Abstracts of Japan, Publication No. JP57195055, Nov. 30, 1982, European Patent Office.
Raymond W. Huggins, "Skew Detector and Method of Correction ",Xerox Disclosure Journal, vol. 14, No. 1, Jan./Feb. 1989, pp. 23-24.

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