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Rotation of a document through a finite angle

  • US 5,282,614 A
  • Filed: 05/10/1991
  • Issued: 02/01/1994
  • Est. Priority Date: 05/10/1991
  • Status: Expired due to Term
First Claim
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1. Apparatus for rotating a sheet, comprising:

  • a conveyance surface on which a sheet, having a first orientation, travels in a first direction;

    first and second rollers for engaging a sheet travelling on said conveyance surface and spaced from each other in a second direction, generally transverse to said first direction;

    first and second drive means, operatively driving said first and second rollers, respectively, independently of each other, at least one of said drive means being reversible;

    sensing means for sensing the leading edge of a sheet, having said first orientation, with respect to said rollers, said sensing means located downstream of said rollers in a first direction;

    control means for controlling the speed and direction of rotation of said drive means in response to said sensing means to rotate the sheet so that it has a second orientation, significantly angularly displaced from the first orientation, comprising computer means for controlling said drive means to effect rotation of the sheet by driving the first roller so that the tangential velocity thereof is in the first direction, and by driving the second roller so that the tangential velocity thereof is in a second direction, opposite the first direction;

    a nip wheel associated with each of said first and second rollers for holding a sheet in contact therewith, said nip wheels being located above said conveyance surface; and

    conveyance means associated with said conveyance surface for delivering a sheet to said first and second rollers, and for transporting said sheet away from said first and second rollers, in said first direction.

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