Dual drive document deskew sheet feeder

Details Dual drive document deskew sheet feeder Dual drive document deskew sheet feeder

1996-02-26

1997-01-28

Terrell, William E.

Sheet feeding or delivering

Feeding

Separators

271272, B65H 306

Patent

active

055971555

ABSTRACT:
A dual drive document deskew and sheet feeder. Paper sheets of various sizes and thicknesses are joggled and aligned into a stack relative to one side and a top of the documents, for example, and the stack is placed in a hinged hopper which is pivoted to be raised relative to left and right special picker rollers. Left and right drive rollers located downstream in a feeding direction from the picker rollers are independently driven by left and right drive stepper motors. Sensors which interact with the leading edge of a document are used to sense whether the document is skewed relative to the feeding direction. A controller receives the outputs from the sensors, and the outputs are used to dynamically deskew the document so that it can be fed into a document receiving apparatus in a deskewed or aligned orientation. The special picker rollers subject the top document being fed to alternating high and low friction forces which minimizes double feeds. Stripper rollers, having one way clutches associated therewith and operating with the associated drive rollers, may be used to return a document to the hopper if the document is too skewed to be deskewed within the parameters of the system.

REFERENCES:
patent: 5187374 (1993-02-01), Rogers
patent: 5267008 (1993-11-01), Rebres et al.
Patent Abstracts of Japan, vol. 17, No. 155, (M-1388), 26 Mar. 1993, & JP-A-04 323 134 (Omron Corp.), 12 Nov. 1992, abstract.
Patent Abstracts of Japan, vol. 17, No. 417 (M-1457), 4 Aug. 1993, & JP-A-05 085 642 (Canon Inc.), 6 Apr. 1993, abstract.
Patent Abstracts of Japan, vol. 18, No. 179 (M-1583), 28 Mar. 1994, & JP-A-05 338 859 9 (Fuji Xerox), 21 Dec. 1993, abstract.

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