Sheet feeding or delivering – Feeding – With means to align sheet
Patent
1986-12-10
1990-11-20
Skaggs, H. Grant
Sheet feeding or delivering
Feeding
With means to align sheet
271236, 271250, 271265, 198415, 198395, 198460, B65H 702
Patent
active
049713043
ABSTRACT:
A method and apparatus for an improved active sheet registration system which provides deskewing and registration of sheets along a paper path in X, Y and .THETA. directions. Sheet drivers are independently controllable to selectively provide differential and non-differential driving of the sheet in accordance with the position of the sheet as sensed by an array of at least three sensors. The sheet is driven non-differently until the initial random skew of the sheet is measured. The sheet is then driven differentially to correct the measured skew, and to induce a known skew. The sheet is then driven non-differentially until a side edge is detected, whereupon the sheet is driven differentially to compensate for the know skew. Upon final deskewing, the sheet is driven non-differentially outwardly from the deskewing and registration arrangement. A fourth sensor may be provided to measure the position of the sheet after registration with respect to desired machine timing.
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"Means to Correct Document Skew", Research Disclosure; Nov. 1979, pp. 642-643, No. 18759.
Skaggs H. Grant
Xerox Corporation
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