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Trail edge buckling sheet buffering system

  • US 5,289,251 A
  • Filed: 05/19/1993
  • Issued: 02/22/1994
  • Est. Priority Date: 05/19/1993
  • Status: Expired due to Fees
First Claim
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1. For a reproduction apparatus feeding a sequential stream of printed copy sheets into a normal sheet path with a limited space and time therebetween, a sheet buffering system comprising:

  • a non-slip downstream sheet feeding nip normally feeding copy sheets downstream towards a sheet output in said normal sheet path;

    said downstream sheet feeding nip being selectably intermittently temporarily stopped with a lead edge of a first copy sheet therein;

    a sheet buckle chamber upstream of said downstream sheet feeding nip extending away from said normal sheet path;

    a non-slip upstream sheet feeding nip positioned sufficiently closely to said downstream nip along said normal sheet path to simultaneously feed said first sheet in said upstream nip while a lead edge of the same sheet is in said downstream nip to drive the trail end of said first copy sheet into said buckle chamber when said downstream nip is so temporarily stopped, and to then feed a second copy sheet with said upstream nip in said normal sheet path past said first copy sheet in said buckle chamber to said downstream nip;

    buckle-inducing sheet baffling in said normal sheet path between said upstream and downstream feeding nips; and

    said downstream nip then being automatically restarted upon said feeding of said second copy sheet thereto by said upstream nip to feed said first copy sheet from said buckle chamber in coordination with the feeding of said second copy sheet, so that both said first and second copy sheets are fed downstream by said downstream nip.

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