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Sheet folding apparatus with vacuum grip

  • US 5,842,964 A
  • Filed: 07/01/1997
  • Issued: 12/01/1998
  • Est. Priority Date: 07/01/1997
  • Status: Expired due to Fees
First Claim
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1. Apparatus for producing a tri-fold in a paper sheet comprising:

  • a first cylinder and a second cylinder, each rotating relative to each other about parallel axes and defining a first nip therebetween;

    first synchronized vacuum means defined on said first cylinder for gripping the sheet in a selected first mid portion location thereof, drawing the sheet thereby into said first nip, and for releasing said selected first mid portion location upon arrival in said first nip;

    second synchronized vacuum means defined on said second cylinder for gripping the sheet with said second cylinder when the sheet arrives at said first nip, in synchronization with said release by said first synchronized vacuum means, for drawing the sheet thereby past said first nip, and for selectively releasing said selected first mid portion location;

    a third cylinder and a fourth cylinder, each rotating relative to each other and relative to said first and second cylinders about parallel axes, defining a second nip between said third and fourth cylinders and defining a third nip between said second and third cylinders; and

    third synchronized vacuum means defined on said third cylinder for gripping the sheet in a selected second mid portion location thereof in synchronization with said release of said second synchronized vacuum means, drawing the sheet into said second nip, and for releasing said selected second mid portion location upon arrival in said second nip.

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